{"id":2456,"date":"2025-04-01T09:53:02","date_gmt":"2025-04-01T09:53:02","guid":{"rendered":"https:\/\/impedyme.com\/?p=2456"},"modified":"2026-06-24T08:32:17","modified_gmt":"2026-06-24T08:32:17","slug":"dual-active-bridge","status":"publish","type":"post","link":"https:\/\/impedyme.com\/de\/resource-center\/dual-active-bridge\/","title":{"rendered":"Dual Active Bridge Control"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"2456\" class=\"elementor elementor-2456\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-c61506b e-con-full elementor-hidden-desktop e-flex e-con e-parent\" data-id=\"c61506b\" data-element_type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-479e12a elementor-widget elementor-widget-image\" data-id=\"479e12a\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div 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class=\"category-tabs\"><span class=\"category-item\" data-cat=\"12\">Application knowledge<\/span><span class=\"category-item\" data-cat=\"22\">Grid<\/span><span class=\"category-item\" data-cat=\"21\">Motor<\/span><span class=\"category-item\" data-cat=\"13\">Product knowledge<\/span><span class=\"category-item\" data-cat=\"38\">Webinars<\/span><\/div><ul class=\"post-list\" data-cat=\"12\"><li> \n                            <a href=\"https:\/\/impedyme.com\/de\/resource-center\/hil-test-pfc-converter\/\"> \n                                <span class=\"post-icon\"> \n                                    <img decoding=\"async\" src=\"https:\/\/cdn-icons-png.flaticon.com\/512\/887\/887997.png\" alt=\"Impedyme Document\"> \n                                <\/span> \n                                <span class=\"post-title\" title=\"Controller HIL Testing of Power Factor Correction Converters\">Controller HIL Testing of Power Factor Correction &#8230;<\/span> \n                           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and Re&#8230;<\/span> \n                            <\/a> \n                          <\/li><li> \n                            <a href=\"https:\/\/impedyme.com\/de\/resource-center\/battery-module-testing\/\"> \n                                <span class=\"post-icon\"> \n                                    <img decoding=\"async\" src=\"https:\/\/cdn-icons-png.flaticon.com\/512\/887\/887997.png\" alt=\"Impedyme Document\"> \n                                <\/span> \n                                <span class=\"post-title\" title=\"Battery Module Testing: Ensuring Performance, Safety, and Reliability\">Battery Module Testing: Ensuring Performance, Safe&#8230;<\/span> \n                            <\/a> \n                          <\/li><li> \n                            <a href=\"https:\/\/impedyme.com\/de\/resource-center\/inverter-testing\/\"> \n                                <span class=\"post-icon\"> \n                                    <img decoding=\"async\" src=\"https:\/\/cdn-icons-png.flaticon.com\/512\/887\/887997.png\" alt=\"Impedyme Document\"> \n                                <\/span> \n                                <span class=\"post-title\" title=\"Inverter Testing: Ensuring Reliability and Performance in EV Powertrains\">Inverter Testing: Ensuring Reliability and Perform&#8230;<\/span> \n                            <\/a> \n                          <\/li><li> \n                            <a href=\"https:\/\/impedyme.com\/de\/resource-center\/battery-cell-testing\/\"> \n                                <span class=\"post-icon\"> \n                                    <img decoding=\"async\" src=\"https:\/\/cdn-icons-png.flaticon.com\/512\/887\/887997.png\" alt=\"Impedyme Document\"> \n                                <\/span> \n                                <span class=\"post-title\" title=\"Battery Cell Testing: Standards, and Modern Test Systems\">Battery Cell Testing: Standards, and Modern Test S&#8230;<\/span> \n            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src=\"https:\/\/cdn-icons-png.flaticon.com\/512\/887\/887997.png\" alt=\"Impedyme Document\"> \n                                <\/span> \n                                <span class=\"post-title\" title=\"DC Fast Charger for EV Battery\">DC Fast Charger for EV Battery<\/span> \n                            <\/a> \n                          <\/li><li> \n                            <a href=\"https:\/\/impedyme.com\/de\/powershelf-testing-data-center\/\"> \n                                <span class=\"post-icon\"> \n                                    <img decoding=\"async\" src=\"https:\/\/cdn-icons-png.flaticon.com\/512\/887\/887997.png\" alt=\"Impedyme Document\"> \n                                <\/span> \n                                <span class=\"post-title\" title=\"Data Center Powershelf Testing with Grid Emulator and DC Load\u200b\">Data Center Powershelf Testing with Grid Emulator &#8230;<\/span> \n                            <\/a> \n                          <\/li><li> \n                            <a href=\"https:\/\/impedyme.com\/de\/resource-center\/derisking-hyperscale-data-center-interconnection\/\"> \n                                <span class=\"post-icon\"> \n                                    <img decoding=\"async\" src=\"https:\/\/cdn-icons-png.flaticon.com\/512\/887\/887997.png\" alt=\"Impedyme Document\"> \n                                <\/span> \n                                <span class=\"post-title\" title=\"De-Risking Hyperscale Data Center Interconnections Through Simulation-First Grid Stability Planning\">De-Risking Hyperscale Data Center Interconnections&#8230;<\/span> \n                            <\/a> \n                          <\/li><li> \n                            <a href=\"https:\/\/impedyme.com\/de\/resource-center\/grid-simulator\/\"> \n                                <span class=\"post-icon\"> \n                                    <img decoding=\"async\" src=\"https:\/\/cdn-icons-png.flaticon.com\/512\/887\/887997.png\" alt=\"Impedyme Document\"> \n                                <\/span> \n                                <span class=\"post-title\" title=\"Grid Simulator\">Grid Simulator<\/span> \n                            <\/a> \n                          <\/li><li> \n                            <a href=\"https:\/\/impedyme.com\/de\/resource-center\/phil-grid-forming\/\"> \n                                <span class=\"post-icon\"> \n                                    <img decoding=\"async\" src=\"https:\/\/cdn-icons-png.flaticon.com\/512\/887\/887997.png\" alt=\"Impedyme Document\"> \n                                <\/span> \n                                <span class=\"post-title\" title=\"Megawatt-Scale Testing Grid Forming with PHIL: Advanced Power Hardware-in-the-Loop Validation\">Megawatt-Scale Testing Grid Forming with PHIL: Adv&#8230;<\/span> \n                            <\/a> \n                          <\/li><li> \n    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                         <\/span> \n                                <span class=\"post-title\" title=\"Webinars\">Webinars<\/span> \n                            <\/a> \n                          <\/li><li> \n                            <a href=\"https:\/\/impedyme.com\/de\/resource-center\/motor-emulator-bldc\/\"> \n                                <span class=\"post-icon\"> \n                                    <img decoding=\"async\" src=\"https:\/\/cdn-icons-png.flaticon.com\/512\/887\/887997.png\" alt=\"Impedyme Document\"> \n                                <\/span> \n                                <span class=\"post-title\" title=\"BLDC Motor Emulator for Testing MCUs and Motor Drives\">BLDC Motor Emulator for Testing MCUs and Motor Dri&#8230;<\/span> \n                            <\/a> \n                          <\/li><li> \n                            <a href=\"https:\/\/impedyme.com\/de\/resource-center\/motor-emulator-humanoid-robots-motor-drive-testing\/\"> \n                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Compliance Test Solutions<\/span> \n                            <\/a> \n                          <\/li><li> \n                            <a href=\"https:\/\/impedyme.com\/de\/variable-frequency-drive-testing\/\"> \n                                <span class=\"post-icon\"> \n                                    <img decoding=\"async\" src=\"https:\/\/cdn-icons-png.flaticon.com\/512\/887\/887997.png\" alt=\"Impedyme Document\"> \n                                <\/span> \n                                <span class=\"post-title\" title=\"Impedyme Motor Emulator and Grid Emulator for Variable Frequency Drive Testing\">Impedyme Motor Emulator and Grid Emulator for Vari&#8230;<\/span> \n                            <\/a> \n                          <\/li><li> \n                            <a href=\"https:\/\/impedyme.com\/de\/resource-center\/grid-emulator-harmonic-solutions\/\"> \n                                <span class=\"post-icon\"> \n                                    <img 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alt=\"Impedyme Document\"> \n                                <\/span> \n                                <span class=\"post-title\" title=\"Three-Phase Grid-Connected Inverter Using Direct-Quadrature\">Three-Phase Grid-Connected Inverter Using Direct-Q&#8230;<\/span> \n                            <\/a> \n                          <\/li><li> \n                            <a href=\"https:\/\/impedyme.com\/de\/resource-center\/three-phase-grid-connected-solar-photovoltaic\/\"> \n                                <span class=\"post-icon\"> \n                                    <img decoding=\"async\" src=\"https:\/\/cdn-icons-png.flaticon.com\/512\/887\/887997.png\" alt=\"Impedyme Document\"> \n                                <\/span> \n                                <span class=\"post-title\" title=\"Three-Phase Grid-Connected Solar Photovoltaic\">Three-Phase Grid-Connected Solar Photovoltaic<\/span> \n                            <\/a> \n                          <\/li><li> \n               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src=\"https:\/\/cdn-icons-png.flaticon.com\/512\/887\/887997.png\" alt=\"Impedyme Document\"> \n                                <\/span> \n                                <span class=\"post-title\" title=\"Induction Motor\">Induction Motor<\/span> \n                            <\/a> \n                          <\/li><li> \n                            <a href=\"https:\/\/impedyme.com\/de\/resource-center\/pwm-control-for-brushless-dc\/\"> \n                                <span class=\"post-icon\"> \n                                    <img decoding=\"async\" src=\"https:\/\/cdn-icons-png.flaticon.com\/512\/887\/887997.png\" alt=\"Impedyme Document\"> \n                                <\/span> \n                                <span class=\"post-title\" title=\"PWM Control for Brushless DC\">PWM Control for Brushless DC<\/span> \n                            <\/a> \n                          <\/li><li> \n                            <a 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href=\"https:\/\/impedyme.com\/de\/resource-center\/ipmsm-based-axle-drive\/\"> \n                                <span class=\"post-icon\"> \n                                    <img decoding=\"async\" src=\"https:\/\/cdn-icons-png.flaticon.com\/512\/887\/887997.png\" alt=\"Impedyme Document\"> \n                                <\/span> \n                                <span class=\"post-title\" title=\"IPMSM-Based Axle-Drive\">IPMSM-Based Axle-Drive<\/span> \n                            <\/a> \n                          <\/li><li> \n                            <a href=\"https:\/\/impedyme.com\/de\/resource-center\/field-oriented-control\/\"> \n                                <span class=\"post-icon\"> \n                                    <img decoding=\"async\" src=\"https:\/\/cdn-icons-png.flaticon.com\/512\/887\/887997.png\" alt=\"Impedyme Document\"> \n                                <\/span> \n                                <span class=\"post-title\" title=\"Field-Oriented Control\">Field-Oriented Control<\/span> \n                            <\/a> \n                          <\/li><li> \n                            <a href=\"https:\/\/impedyme.com\/de\/resource-center\/interior-permanent-magnet-synchronous-generator\/\"> \n                                <span class=\"post-icon\"> \n                                    <img decoding=\"async\" src=\"https:\/\/cdn-icons-png.flaticon.com\/512\/887\/887997.png\" alt=\"Impedyme Document\"> \n                                <\/span> \n                                <span class=\"post-title\" title=\"Interior Permanent Magnet Synchronous Generator\">Interior Permanent Magnet Synchronous Generator<\/span> \n                            <\/a> \n                          <\/li><li> \n                            <a href=\"https:\/\/impedyme.com\/de\/resource-center\/permanent-magnet-synchronous-machine\/\"> \n                                <span class=\"post-icon\"> \n                                    <img decoding=\"async\" src=\"https:\/\/cdn-icons-png.flaticon.com\/512\/887\/887997.png\" alt=\"Impedyme Document\"> \n                                <\/span> \n                                <span class=\"post-title\" title=\"Permanent Magnet Synchronous Machine\">Permanent Magnet Synchronous Machine<\/span> \n                            <\/a> \n                          <\/li><li> \n                            <a href=\"https:\/\/impedyme.com\/de\/resource-center\/pmsm-rotor-angular-velocity\/\"> \n                                <span class=\"post-icon\"> \n                                    <img decoding=\"async\" src=\"https:\/\/cdn-icons-png.flaticon.com\/512\/887\/887997.png\" alt=\"Impedyme Document\"> \n                                <\/span> \n                                <span class=\"post-title\" title=\"PMSM Rotor Angular Velocity\">PMSM Rotor Angular Velocity<\/span> \n                            <\/a> \n                          <\/li><li> \n                           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                <span class=\"post-title\" title=\"Six-Phase Permanent Magnet Synchronous Machine\">Six-Phase Permanent Magnet Synchronous Machine<\/span> \n                            <\/a> \n                          <\/li><li> \n                            <a href=\"https:\/\/impedyme.com\/de\/resource-center\/synchronous-machine-based-electrical-drive-simulation\/\"> \n                                <span class=\"post-icon\"> \n                                    <img decoding=\"async\" src=\"https:\/\/cdn-icons-png.flaticon.com\/512\/887\/887997.png\" alt=\"Impedyme Document\"> \n                                <\/span> \n                                <span class=\"post-title\" title=\"Synchronous Machine-Based Electrical Drive Simulation\">Synchronous Machine-Based Electrical Drive Simulat&#8230;<\/span> \n                            <\/a> \n                          <\/li><\/ul><ul class=\"post-list\" data-cat=\"13\"><li> \n                            <a href=\"https:\/\/impedyme.com\/de\/powerhardware-in-the-loop\/\"> \n                                <span class=\"post-icon\"> \n                                    <img decoding=\"async\" src=\"https:\/\/cdn-icons-png.flaticon.com\/512\/887\/887997.png\" alt=\"Impedyme Document\"> \n                                <\/span> \n                                <span class=\"post-title\" title=\"Purpose and Role of Power Hardware in the Loop (PHIL) Simulation\">Purpose and Role of Power Hardware in the Loop (PH&#8230;<\/span> \n                            <\/a> \n                          <\/li><li> \n                            <a href=\"https:\/\/impedyme.com\/de\/optimizing-grid-connected-converters-for-stability\/\"> \n                                <span class=\"post-icon\"> \n                                    <img decoding=\"async\" src=\"https:\/\/cdn-icons-png.flaticon.com\/512\/887\/887997.png\" alt=\"Impedyme Document\"> \n                                <\/span> \n                                <span class=\"post-title\" title=\"Optimizing Grid-Connected Converters for Stability\">Optimizing Grid-Connected Converters for Stability<\/span> \n                            <\/a> \n                          <\/li><li> \n                            <a href=\"https:\/\/impedyme.com\/de\/unlocking-insights-into-power-system-stability\/\"> \n                                <span class=\"post-icon\"> \n                                    <img decoding=\"async\" src=\"https:\/\/cdn-icons-png.flaticon.com\/512\/887\/887997.png\" alt=\"Impedyme Document\"> \n                                <\/span> \n                                <span class=\"post-title\" title=\"Unlocking Insights into Power System Stability\">Unlocking Insights into Power System Stability<\/span> \n                            <\/a> \n                          <\/li><\/ul><ul class=\"post-list\" data-cat=\"38\"><li> \n                            <a href=\"https:\/\/impedyme.com\/de\/resource-center\/webinars\/\"> \n                                <span class=\"post-icon\"> \n                                    <img decoding=\"async\" src=\"https:\/\/cdn-icons-png.flaticon.com\/512\/887\/887997.png\" alt=\"Impedyme Document\"> \n                                <\/span> \n                                <span class=\"post-title\" title=\"Webinars\">Webinars<\/span> \n                            <\/a> \n                          <\/li><\/ul><\/div><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-4d92924 e-con-full e-flex e-con e-child\" data-id=\"4d92924\" data-element_type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-1793840 elementor-hidden-tablet elementor-hidden-mobile elementor-widget elementor-widget-image\" data-id=\"1793840\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"1024\" height=\"464\" src=\"https:\/\/impedyme.com\/wp-content\/uploads\/2025\/04\/header-DualActiveBridgeControlExample-car-charger-wireframe-1024x464.jpeg\" class=\"attachment-large size-large wp-image-2458\" alt=\"Impedyme Dual Active Bridge Control car charger wireframe\" srcset=\"https:\/\/impedyme.com\/wp-content\/uploads\/2025\/04\/header-DualActiveBridgeControlExample-car-charger-wireframe-1024x464.jpeg.webp 1024w, https:\/\/impedyme.com\/wp-content\/uploads\/2025\/04\/header-DualActiveBridgeControlExample-car-charger-wireframe-300x136.jpeg.webp 300w, https:\/\/impedyme.com\/wp-content\/uploads\/2025\/04\/header-DualActiveBridgeControlExample-car-charger-wireframe-768x348.jpeg.webp 768w, https:\/\/impedyme.com\/wp-content\/uploads\/2025\/04\/header-DualActiveBridgeControlExample-car-charger-wireframe-1536x696.jpeg.webp 1536w, https:\/\/impedyme.com\/wp-content\/uploads\/2025\/04\/header-DualActiveBridgeControlExample-car-charger-wireframe-150x68.jpeg.webp 150w, https:\/\/impedyme.com\/wp-content\/uploads\/2025\/04\/header-DualActiveBridgeControlExample-car-charger-wireframe-480x217.jpeg.webp 480w, https:\/\/impedyme.com\/wp-content\/uploads\/2025\/04\/header-DualActiveBridgeControlExample-car-charger-wireframe.jpeg.webp 2020w\" sizes=\"(max-width:767px) 480px, (max-width:1024px) 100vw, 1024px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7a5674d elementor-widget elementor-widget-heading\" data-id=\"7a5674d\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h1 class=\"elementor-heading-title elementor-size-default\">Dual Active Bridge Control: Topology, Modulation, and Real-Time Validation\n\n<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2b8ca7b elementor-widget elementor-widget-text-editor\" data-id=\"2b8ca7b\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p style=\"text-align: center;\">[custom_toc]<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d7905b2 elementor-widget elementor-widget-text-editor\" data-id=\"d7905b2\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"12:1-12:384;594-977\">The dual active bridge has become the default choice wherever a system needs isolated, two-way<a href=\"https:\/\/impedyme.com\/resource-center\/dc-dc-converter-testing\/\"> DC-DC conversion<\/a>. But the topology is only as good as the dual active bridge control strategy that runs it. The same hardware can deliver near-99% efficiency or bleed power into circulating currents depending entirely on how its phase shifts are commanded, modeled, and validated.<\/p><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"14:1-14:346;979-1324\">\u00a0the dual active bridge topology, the modulation hierarchy that defines its control, the soft-switching and backflow-power physics every controller must respect, and\u2014critically\u2014how to validate that control in real time through dual active bridge simulation on FPGA-based <a href=\"https:\/\/impedyme.com\/hardware-in-the-loop\">hardware-in-the-loop platforms.<\/a><\/p><h2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"16:1-16:32;1326-1357\">What a Dual Active Bridge Is<\/h2><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"18:1-18:330;1359-1688\">The dual active bridge, almost always shortened to DAB, is a high-frequency, galvanically isolated DC-DC converter designed to move power in either direction between two DC buses. It shows up across an enormous power range, from roughly a hundred watts in small auxiliary supplies up to several megawatts in grid-scale equipment.<\/p><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"20:1-20:478;1690-2167\">Structurally the dual active bridge converter is elegant: two full bridges, built from controllable power switches, sit on either side of a high-frequency transformer. Because both bridges are actively switched rather than one acting as a passive rectifier, energy can travel from primary to secondary or from secondary to primary using exactly the same hardware. That single property\u2014symmetry between the two sides\u2014is what gives the DAB its name and its defining behavior.<\/p><h3 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"22:1-22:61;2169-2229\">The Physical Structure of the Dual Active Bridge Topology<\/h3><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"24:1-24:58;2231-2288\">Three components do essentially all of the work in a DAB.<\/p><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"26:1-26:477;2290-2766\">The first is the <strong>pair of active bridges<\/strong>. Each bridge contains four controllable switches\u2014commonly silicon MOSFETs, silicon carbide (SiC) MOSFETs, gallium nitride (GaN) devices, or IGBTs depending on the voltage and power class\u2014so a standard single-phase DAB uses eight switches in total. Each bridge converts DC into a high-frequency AC square wave, and because both sides do this simultaneously under active control, power flows either way without any change in topology.<\/p><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"28:1-28:561;2768-3328\">The second component is the <strong>high-frequency transformer<\/strong>. Its job is twofold: it provides galvanic isolation between the two DC buses, a requirement mandated by safety standards in applications such as electric vehicle charging, and it sets the voltage step-up or step-down ratio through its turns ratio. Running the transformer at high frequency rather than line frequency is what allows it, along with the associated filter components, to shrink dramatically in size and weight. This is the underlying reason DAB converters achieve such high power density.<\/p><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"30:1-30:524;3330-3853\">The third component, often overlooked, is the <strong>series inductor<\/strong> that carries energy from one side to the other during each switching cycle. In many designs this inductor is not a separate physical part; it is realized using the transformer&#8217;s own leakage inductance, sometimes supplemented with an external inductor. Using leakage inductance this way reduces parts count and losses, but it means the transformer must be designed with a tightly controlled leakage value, which complicates the magnetics design considerably.<\/p><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"32:1-32:243;3855-4097\">This three-part dual active bridge topology\u2014two H-bridges, one transformer, one energy-transfer inductor\u2014is the basis of every variant, from single-phase DABs to three-phase, multilevel, and multiport (multi-active-bridge) configurations.<\/p><h3 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"34:1-34:69;4099-4167\">Steady-State Principle of Operation and Inductor Current Dynamics<\/h3><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"36:1-36:372;4169-4540\">The core mechanism of dual active bridge control relies on modulating the <strong>phase displacement<\/strong> between the two AC voltage square waves generated at the terminals of the high-frequency isolation transformer. This control method, known as <strong>Single-Phase Shift (SPS) modulation<\/strong>, maintains a constant fifty percent duty cycle for both the primary and secondary H-bridges.<\/p><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"38:1-38:449;4542-4990\">The diagonal switch pairs in the primary bridge are switched on and off in a complementary manner with appropriate dead-time intervals to prevent short circuits. This generates a two-level high-frequency AC square-wave voltage with a peak amplitude equal to the primary DC bus voltage. Similarly, the secondary-side switches are modulated to generate a high-frequency square-wave voltage with a peak amplitude equal to the secondary DC bus voltage.<\/p><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"40:1-40:298;4992-5289\">By introducing a controlled phase shift angle between the primary and secondary square waves, a voltage differential develops across the series inductor. This voltage differential drives an AC current through the inductor and transformer windings, enabling controlled bidirectional power transfer.<\/p><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"42:1-42:273;5291-5563\">To model the continuous current dynamics within a switching half-period, the operating states are analyzed under forward power transfer, where the primary voltage waveform leads the referred secondary voltage waveform. The half-period divides into two switching intervals.<\/p><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"44:1-44:529;5565-6093\"><span style=\"color: #d18100;\"><strong>Interval 1.<\/strong><\/span> At the beginning of the half-period, the primary-side switches turn on, applying a positive voltage across the primary terminals of the transformer. Meanwhile, the secondary-side switches continue to apply a negative voltage to the secondary terminals. Referred to the primary side, the voltage across the series energy-transfer inductor equals the sum of the primary DC bus voltage and the referred secondary DC voltage. As a result, the inductor current increases linearly from its initial negative peak value.<\/p><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"46:1-46:485;6095-6579\"><span style=\"color: #d18100;\"><strong>Interval 2.<\/strong><\/span> At the phase-shift transition point, the secondary-side switches commute, reversing the polarity of the referred secondary terminal voltage to positive, while the primary voltage remains positive. The voltage across the series inductor changes to the difference between the primary DC bus voltage and the referred secondary DC voltage. The slope of the inductor current alters accordingly, and the current continues to evolve linearly toward its next transition value.<\/p><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"48:1-48:408;6581-6988\">By leveraging the steady-state half-wave symmetry of the AC waveforms, the inductor current at the end of the switching half-cycle must be equal in magnitude but opposite in sign to the current at the beginning. This boundary condition allows for analytical determination of the transition currents as functions of the primary voltage, referred secondary voltage, series inductance, and switching frequency.<\/p><h3 class=\"text-text-100 mt-2 -mb-1 text-base font-bold\" data-sourcepos=\"50:1-50:32;6990-7021\">The Power-Transfer Equation<\/h3><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"52:1-52:448;7023-7470\">The active power transferred from primary to secondary is calculated by averaging the instantaneous input power over a switching half-cycle. Under single-phase shift control, this power-transfer characteristic is <strong>parabolic<\/strong>. The active power is directly proportional to the product of the primary voltage, the referred secondary voltage, and a phase shift factor, and inversely proportional to the series inductance and the switching frequency.<\/p><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"54:1-54:476;7472-7947\">This relationship demonstrates that <strong>maximum active power transfer occurs when the normalized phase shift is exactly one-half<\/strong>, corresponding to a ninety-degree phase displacement between the primary and secondary square waves. Operating with a phase shift greater than ninety degrees is avoided in practical systems because the derivative of power with respect to phase shift becomes negative, which degrades control stability and generates excessive circulating currents.<\/p><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"56:1-56:224;7949-8172\">These three levers\u2014primary and secondary voltages, series inductance, and switching frequency\u2014define the design envelope, while the phase shift is the real-time control handle the digital controller commands cycle by cycle.<\/p><h3 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"58:1-58:46;8174-8219\">Zero-Voltage Switching Commutation Physics<\/h3><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"60:1-60:351;8221-8571\">One of the most valuable features of the dual active bridge topology is its ability to naturally achieve <strong>Zero-Voltage Switching (ZVS)<\/strong> for all primary and secondary semiconductor devices. Achieving soft-switching transitions eliminates turn-on losses, minimizes electromagnetic interference, and allows operation at high switching frequencies.<\/p><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"62:1-62:484;8573-9056\">The physical mechanism of ZVS relies on utilizing the energy stored in the series inductor to charge and discharge the parasitic output capacitances of the semiconductor devices during the programmed dead-time intervals. Consider a single leg in the primary H-bridge consisting of an upper switch and a lower switch, each with an associated parallel parasitic capacitance and anti-parallel body diode. During a switching transition, the commutation sequence proceeds in three phases.<\/p><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"64:1-64:652;9058-9709\"><span style=\"color: #d18100;\"><strong>Phase 1: Turn-off transition and capacitive charging\/discharging.<\/strong><\/span> Prior to the transition, the lower switch is conducting positive current, holding the switch node voltage at ground. When the gate signal for the lower switch is forced low, the switch turns off. Because the current through the series inductor cannot change instantaneously, the turn-off current is redirected from the semiconductor channel into the parasitic output capacitances of both switches. The current charges the parasitic capacitance of the lower switch toward the DC bus voltage while simultaneously discharging the parasitic capacitance of the upper switch toward zero.<\/p><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"66:1-66:465;9711-10175\"><span style=\"color: #d18100;\"><strong>Phase 2: Body-diode conduction and voltage clamping.<\/strong> <\/span>When the voltage across the parasitic capacitance of the upper switch reaches zero, the negative voltage across its anti-parallel body diode forward-biases it. This clamps the switch node voltage to the primary DC bus voltage, and the inductor current freewheels through the body diode. Because the voltage across the upper switch is clamped to a diode drop, its drain-to-source voltage is effectively zero.<\/p><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"68:1-68:487;10177-10663\"><span style=\"color: #d18100;\"><strong>Phase 3: Zero-voltage turn-on.<\/strong><\/span> The gate-drive signal for the upper switch is applied while its anti-parallel body diode is actively conducting. Since the voltage across the channel is zero, the switch turns on with zero-voltage switching, eliminating turn-on losses and preventing capacitive discharge dissipation. After this turn-on event, the inductor current crosses zero and changes direction, transferring current flow smoothly from the body diode to the semiconductor channel.<\/p><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"70:1-70:383;10665-11047\">For a successful ZVS transition, the inductor current must have the correct polarity and sufficient energy at the switching instant to fully charge and discharge the parasitic output capacitances. If the inductor energy is too low, the switch node voltage will not reach the opposite rail during the dead-time interval, resulting in hard-switching transitions and capacitive losses.<\/p><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"72:1-72:457;11049-11505\">The soft-switching boundaries are highly dependent on the <strong>voltage matching ratio<\/strong>, defined as the ratio of the referred secondary voltage to the primary voltage. When the voltage matching ratio is greater than unity, the phase shift must exceed a minimum threshold to ensure the primary switches achieve ZVS. Conversely, when the ratio is less than unity, the phase shift must be large enough to guarantee soft-switching for the secondary-side switches.<\/p><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"74:1-74:554;11507-12060\">When the converter operates outside these boundaries\u2014typically during light-load conditions where the phase shift ratio approaches zero\u2014the inductor current is insufficient to discharge the parasitic capacitances, resulting in hard switching. Active hardware enhancements, such as auxiliary commutation inductors, can supply additional reactive current, though they increase complexity and RMS currents. Advanced multi-phase-shift modulation schemes are a highly effective alternative to extend the ZVS range without increasing physical component count.<\/p><h3 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"76:1-76:43;12062-12104\">Backflow Power and Circulating Currents<\/h3><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"78:1-78:306;12106-12411\">A major performance challenge of dual active bridge control under SPS is <strong>backflow power<\/strong>, also called reactive circulating power: the electrical power that flows back to the transmitting source during a portion of each switching half-cycle, contrary to the overall direction of active power conversion.<\/p><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"80:1-80:300;12413-12712\">This phenomenon occurs when the instantaneous voltage at the primary terminals of the transformer and the inductor current have opposite signs. Under these conditions the instantaneous power is negative, indicating energy is being returned to the primary DC link rather than transferred to the load.<\/p><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"82:1-82:432;12714-13145\">During a forward power-transfer half-cycle, the primary bridge voltage is positive while the inductor current starts negative. The current rises linearly and crosses zero at a specific instant during the half-period. During the initial interval before the zero-crossing, power is returned to the source. The duration of this reverse flow is determined by the switching period, the voltage matching ratio, and the phase shift ratio.<\/p><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"84:1-84:367;13147-13513\">The magnitude of backflow power is highly dependent on voltage mismatch and phase shift ratio. Under perfectly matched voltage conditions, backflow power is minimized. However, when the voltage matching ratio deviates significantly from unity, backflow power increases rapidly. Under light-load conditions where the phase shift is small, backflow power remains high.<\/p><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"86:1-86:554;13515-14068\">The physical consequence is a significant increase in circulating currents. These currents do not contribute to net power delivered to the load but flow continuously through the semiconductor channels, body diodes, transformer windings, and series inductors. This leads to high RMS currents and substantial conduction losses. Consequently, the efficiency of a DAB operating under SPS degrades severely at light loads or high voltage mismatches, making efficiency optimization a key challenge for systems that operate across wide voltage and load ranges.<\/p><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"88:1-88:318;14070-14387\">This is the central tension every advanced dual active bridge control scheme exists to resolve: ZVS demands a negative switching-instant current, but that same current is what creates backflow. The two objectives pull in opposite directions, and the modulation strategy is how an engineer negotiates between them.<\/p><h2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"90:1-90:46;14389-14434\">Advanced Phase-Shift Modulation Strategies<\/h2><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"92:1-92:376;14436-14811\">To mitigate backflow power, minimize RMS currents, and extend the soft-switching range across wide voltage limits, advanced multi-phase-shift modulation schemes introduce additional control degrees of freedom by using inner phase shifts within the individual H-bridges, transforming the transformer terminal voltages from two-level square waves into three-level square waves.<\/p><h4 class=\"text-text-100 mt-2 -mb-1 text-base font-bold\" data-sourcepos=\"94:1-94:29;14813-14841\"><span style=\"color: #d18100;\">Single-Phase Shift (SPS)<\/span><\/h4><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"96:1-96:339;14843-15181\">SPS is the baseline: a single control variable\u2014the phase shift between the two bridges. It is the simplest scheme to implement and offers fast dynamics and inherent buck-boost capability, but it has a limited ZVS region, higher current stress, and significant backflow power when the load is light or the voltage ratio departs from unity.<\/p><h4 class=\"text-text-100 mt-2 -mb-1 text-base font-bold\" data-sourcepos=\"98:1-98:42;15183-15224\"><span style=\"color: #d18100;\">Extended-Phase-Shift (EPS) Modulation<\/span><\/h4><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"100:1-100:555;15226-15780\">EPS introduces an inner phase-shift ratio between the diagonally operating switches of the primary-side H-bridge. The secondary-side H-bridge continues to operate with a fifty percent duty cycle, producing a three-level voltage waveform with a zero-voltage interval at the transformer primary winding. The external phase shift controls the magnitude and direction of active power transfer, while the inner phase shift lets the zero-voltage interval be matched dynamically to the operating voltage ratio\u2014suppressing peak current stress and backflow power.<\/p><h4 class=\"text-text-100 mt-2 -mb-1 text-base font-bold\" data-sourcepos=\"102:1-102:38;15782-15819\"><span style=\"color: #d18100;\">Dual-Phase-Shift (DPS) Modulation<\/span><\/h4><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"104:1-104:499;15821-16319\">DPS introduces an identical inner phase-shift ratio to both the primary and secondary H-bridges, generating matching three-level voltage waveforms with equal zero-voltage intervals at both transformer terminals. The external phase shift regulates active power. Because the inner phase shifts are identical, the control algorithm is less complex than other three-variable strategies while remaining highly effective at reducing current stress and eliminating backflow power under wide voltage gains.<\/p><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"106:1-106:329;16321-16649\">Under DPS, the average output current, RMS inductor current, active power, and apparent power are all expressed as functions of the inner phase shifts, the external phase shift, and the voltage ratio. This lets the digital controller select optimal phase-shift combinations that minimize current stress for a given power demand.<\/p><h4 class=\"text-text-100 mt-2 -mb-1 text-base font-bold\" data-sourcepos=\"108:1-108:40;16651-16690\"><span style=\"color: #d18100;\">Triple-Phase-Shift (TPS) Modulation<\/span><\/h4><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"110:1-110:91;16692-16782\">TPS is the most generalized control scheme, providing three independent control variables:<\/p><ul class=\"[li_&amp;]:mb-0 [li_&amp;]:mt-1 [li_&amp;]:gap-1 [&amp;:not(:last-child)_ul]:pb-1 [&amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"112:1-114:104;16784-17077\"><li class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"112:1-112:93;16784-16876\">The <strong>primary H-bridge inner phase shift<\/strong>, controlling the primary zero-voltage interval.<\/li><li class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"113:1-113:97;16877-16973\">The <strong>secondary H-bridge inner phase shift<\/strong>, controlling the secondary zero-voltage interval.<\/li><li class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"114:1-114:104;16974-17077\">The <strong>external phase shift<\/strong> between the rising edges of the primary and secondary voltage waveforms.<\/li><\/ul><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"116:1-116:414;17079-17492\">Under TPS there are twelve distinct operating modes defined by the relationships among the three phase shifts. This versatility allows the control system to optimize performance across the entire load range, maintain ZVS for all devices from zero to full load, and guarantee the minimum-RMS-current trajectory for any arbitrary voltage ratio. Notably, SPS, EPS, and DPS can all be treated as special cases of TPS.<\/p><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"118:1-118:291;17494-17784\">Evaluating the mode constraints and executing the corresponding piece-wise algorithms in real time is where computational platform capability becomes decisive\u2014matching the transient demands of high-power grids requires the controller to recalculate optimal operating parameters every cycle.<\/p><p data-sourcepos=\"118:1-118:291;17494-17784\">\n<table id=\"tablepress-96\" class=\"tablepress tablepress-id-96\">\n<thead>\n<tr class=\"row-1\">\n\t<th class=\"column-1\">Scheme<\/th><th class=\"column-2\">Key characteristics<\/th><th class=\"column-3\">Best fit<\/th>\n<\/tr>\n<\/thead>\n<tbody class=\"row-striping row-hover\">\n<tr class=\"row-2\">\n\t<td class=\"column-1\">SPS<\/td><td class=\"column-2\">1 control variable; simplest, but narrow ZVS range and high backflow at light load \/ voltage mismatch<\/td><td class=\"column-3\">Near-unity voltage ratio, steady load<\/td>\n<\/tr>\n<tr class=\"row-3\">\n\t<td class=\"column-1\">EPS<\/td><td class=\"column-2\">2 variables (inner shift on primary); wider ZVS, reduced backflow, moderate complexity<\/td><td class=\"column-3\">Asymmetric voltage ranges<\/td>\n<\/tr>\n<tr class=\"row-4\">\n\t<td class=\"column-1\">DPS<\/td><td class=\"column-2\">2 symmetric inner shifts; wide ZVS, low backflow, moderate complexity<\/td><td class=\"column-3\">Wide voltage gain, balanced complexity<\/td>\n<\/tr>\n<tr class=\"row-5\">\n\t<td class=\"column-1\">TPS<\/td><td class=\"column-2\">3 variables; full ZVS from zero to full load, minimum-RMS trajectory, highest complexity<\/td><td class=\"column-3\">Widest voltage\/load envelope<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<!-- #tablepress-96 from cache --><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-26687ad elementor-widget elementor-widget-image\" data-id=\"26687ad\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"976\" height=\"555\" src=\"https:\/\/impedyme.com\/wp-content\/uploads\/2025\/04\/dual-active-bridge-converter-control.png\" class=\"attachment-large size-large wp-image-2460\" alt=\"dual active bridge converter control\" srcset=\"https:\/\/impedyme.com\/wp-content\/uploads\/2025\/04\/dual-active-bridge-converter-control.png.webp 976w, https:\/\/impedyme.com\/wp-content\/uploads\/2025\/04\/dual-active-bridge-converter-control-300x171.png.webp 300w, https:\/\/impedyme.com\/wp-content\/uploads\/2025\/04\/dual-active-bridge-converter-control-768x437.png.webp 768w, https:\/\/impedyme.com\/wp-content\/uploads\/2025\/04\/dual-active-bridge-converter-control-132x75.png.webp 132w, https:\/\/impedyme.com\/wp-content\/uploads\/2025\/04\/dual-active-bridge-converter-control-480x273.png.webp 480w\" sizes=\"(max-width:767px) 480px, (max-width:976px) 100vw, 976px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3a6e6e4 elementor-widget elementor-widget-text-editor\" data-id=\"3a6e6e4\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"133:1-133:255;18640-18894\">A complete dual active bridge control scheme is best understood as a closed loop wrapped around the converter. The block diagram above shows the functional pieces that every DAB control implementation shares, whatever modulation strategy runs underneath:<\/p><ul class=\"[li_&amp;]:mb-0 [li_&amp;]:mt-1 [li_&amp;]:gap-1 [&amp;:not(:last-child)_ul]:pb-1 [&amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"135:1-138:428;18896-19705\"><li class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"135:1-135:80;18896-18975\"><span style=\"color: #d18100;\"><strong>DC System<\/strong><\/span> \u2014 the input source and primary DC bus that feeds the converter.<\/li><li class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"136:1-136:177;18976-19152\"><span style=\"color: #d18100;\"><strong>Dual Active Bridge<\/strong> <\/span>\u2014 the power stage itself, exposing its primary terminals (S1+, S1\u2212), secondary terminals (S2+, S2\u2212), and a gate input that commands all eight switches.<\/li><li class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"137:1-137:125;19153-19277\"><span style=\"color: #d18100;\"><strong>Load<\/strong> <\/span>\u2014 the regulated output bus (VDC+, VDC\u2212), here a DC load or battery whose voltage the controller must hold steady.<\/li><li class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"138:1-138:428;19278-19705\"><span style=\"color: #d18100;\"><strong>Controller and gate driver<\/strong><\/span> \u2014 the heart of the loop. The controller compares the measured output voltage (Vout) against a reference (Vref, set here to 20 V), computes the required control action, and passes it to the gate driver, which converts that command into the precisely timed, phase-shifted gate signals that drive the bridges. A separate visualization output feeds the measurement and scope blocks for observation.<\/li><\/ul><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"140:1-140:468;19707-20174\">The closed loop is what makes the converter usable: the controller continuously adjusts the phase shift to hold the output at its setpoint as the source voltage, load current, and direction of power flow change. Everything covered above \u2014 SPS through TPS modulation, ZVS, and transient-DC-bias suppression \u2014 lives inside that controller-and-gate-driver path, which is exactly why it has to be verified in a real-time closed loop rather than on static waveforms alone.<\/p><h3 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"142:1-142:57;20176-20232\">Control-Loop Design and the Transient DC-Bias Problem<\/h3><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"144:1-144:505;20234-20738\">A DAB is a nonlinear, time-varying system, which makes its control loop genuinely difficult to design well. The standard approach derives a small-signal averaged model of the converter\u2014using reduced-order, generalized-state-space-averaging, or discrete-time methods\u2014and then linearizes that model to tune the compensators. Discrete-time models tend to be favored at high switching frequencies because they better capture behavior within the ZVS interval, which an averaged continuous-time model can miss.<\/p><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"146:1-146:451;20740-21190\">The typical structure is a cascaded outer-voltage \/ inner-current loop. Linear PI compensators are most common, but the literature also covers robust PI, sliding-mode control, feedforward-plus-feedback hybrids, disturbance-observer-based control, and model predictive control (MPC). MPC is prized for fast transient response but constrained by computational burden and sensitivity to model parameters\u2014another reason platform compute capacity matters.<\/p><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"148:1-148:654;21192-21845\">One failure mode deserves special attention: <strong>transient DC bias<\/strong>. When the phase shift between the bridges changes abruptly\u2014during a load step, an output-voltage change, or a reversal of power-flow direction\u2014a momentary imbalance in the volt-second product applied to the transformer can inject a DC offset into both the transformer&#8217;s magnetic flux and the inductor current. If left unmanaged, this can push the transformer core toward saturation, produce peak currents that exceed the safe ratings of the switches, cause oscillations on the DC bus voltage, and temporarily destroy the soft-switching condition the converter depends on for efficiency.<\/p><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"150:1-150:492;21847-22338\">Suppressing this bias\u2014through duty-cycle modulation, predictive flux balancing, double-sided SPS, soft-magnetizing soft-start, precise dead-time control, or dedicated current-injection windings\u2014is essential for long-term reliability. It is also exactly the kind of fast, transient behavior that is extremely difficult to verify without testing the converter in a real-time closed loop, which is where dual active bridge simulation on hardware-in-the-loop platforms becomes indispensable.<\/p><h3 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"152:1-152:53;22340-22392\">Key Advantages of the Dual Active Bridge Topology<\/h3><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"154:1-154:83;22394-22476\">The DAB earns its widespread adoption through a cluster of reinforcing advantages:<\/p><ul class=\"[li_&amp;]:mb-0 [li_&amp;]:mt-1 [li_&amp;]:gap-1 [&amp;:not(:last-child)_ul]:pb-1 [&amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"156:1-162:141;22478-23576\"><li class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"156:1-156:220;22478-22697\"><span style=\"color: #d18100;\"><strong>Bidirectional power flow<\/strong><\/span> purely through phase-shift control, with smooth, seamless reversal that requires no hardware change\u2014a natural fit for charging and discharging, regenerative applications, and grid support.<\/li><li class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"157:1-157:122;22698-22819\"><span style=\"color: #d18100;\"><strong>Galvanic isolation<\/strong><\/span> from the high-frequency transformer, satisfying safety codes and breaking unwanted ground loops.<\/li><li class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"158:1-158:150;22820-22969\"><span style=\"color: #d18100;\"><strong>High power density<\/strong><\/span>, because high-frequency operation paired with wide-bandgap devices shrinks the transformer, inductor, and filter components.<\/li><li class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"159:1-159:145;22970-23114\"><span style=\"color: #d18100;\"><strong>High efficiency<\/strong><\/span>, with soft switching through ZVS pushing peak efficiency close to 99 percent in well-designed SiC and GaN implementations.<\/li><li class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"160:1-160:193;23115-23307\"><span style=\"color: #d18100;\"><strong>Modularity<\/strong><\/span>, since the symmetrical structure of the two bridges simplifies modeling and makes it straightforward to build paralleled or interleaved systems from identical building blocks.<\/li><li class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"161:1-161:128;23308-23435\"><span style=\"color: #d18100;\"><strong>Wide voltage tolerance<\/strong><\/span>, with inherent buck-boost capability that matters when battery and bus voltages vary continuously.<\/li><li class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"162:1-162:141;23436-23576\"><span style=\"color: #d18100;\"><strong>Low device stress and fixed-frequency operation<\/strong><\/span>, which support its use as a modular building block in high-power and cascaded systems.<\/li><\/ul><h3 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"164:1-164:45;23578-23622\">Dual Active Bridge vs. Resonant LLC\/CLLLC<\/h3><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"166:1-166:279;23624-23902\">Selecting the optimal bidirectional DC-DC converter topology is a critical architectural decision that depends on voltage range, load profile, and power density requirements. The DAB and resonant topologies (LLC and CLLLC) are the leading candidates for high-power applications.<\/p><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"168:1-168:525;23904-24428\"><span style=\"color: #d18100;\"><strong>Architectural differences.<\/strong><\/span> The DAB uses a non-resonant inductive network where power transfer is governed by the phase-shift-induced voltage drop across a series inductor. LLC and CLLLC converters incorporate resonant tanks containing multiple reactive elements. An LLC converter uses a series resonant capacitor, a series resonant inductor, and a large magnetizing inductance. A CLLLC converter adds a matching resonant capacitor and inductor on the secondary side to achieve fully symmetrical bidirectional power flow.<\/p><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"170:1-170:496;24430-24925\"><span style=\"color: #d18100;\"><strong>Control paradigms.<\/strong><\/span> The DAB operates at a <strong>fixed switching frequency<\/strong>, regulating power and voltage by adjusting phase shift and duty cycle. This simplifies EMI filter design and magnetic core utilization. LLC and CLLLC converters typically rely on <strong>variable frequency modulation<\/strong>, sweeping the switching frequency across a wide range to navigate the gain curve of the resonant tank\u2014which complicates magnetic optimization and can introduce unpredictable EMI behavior across the spectrum.<\/p><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"172:1-172:591;24927-25517\"><span style=\"color: #d18100;\"><strong>Soft-switching and loss profiles.<\/strong><\/span> For resonant converters, ZVS can be realized across all load conditions, including light loads and wide voltage ranges, and because the resonant current is sinusoidal, switches experience extremely low turn-off currents and minimal turn-off losses. In a DAB, switches experience high turn-off current under standard SPS, leading to higher turn-off losses across most of the voltage range. While the DAB can achieve full ZVS across its entire range using commutation inductors or advanced modulation, this can increase RMS current and conduction losses.<\/p><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"174:1-174:214;25519-25732\">In short: choose the DAB for ease of bidirectional operation, modular high-power structures, and wide voltage ranges; choose LLC\/CLLLC for fixed-ratio applications where light-load efficiency and low EMI dominate.<\/p><h3 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"176:1-176:57;25734-25790\">Wide-Bandgap Devices in Dual Active Bridge Converters<\/h3><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"178:1-178:475;25792-26266\">The performance ceiling of a modern DAB is set largely by its semiconductors. Silicon carbide (SiC) MOSFETs and gallium nitride (GaN) HEMTs enable switching frequencies from tens of kilohertz into the megahertz range, which shrinks the magnetics and pushes power density well beyond what silicon IGBTs allow. Peak efficiencies above 98 percent are well documented in SiC-based designs, with the highest-performing reference designs reporting peak efficiency near 99 percent.<\/p><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"180:1-180:413;26268-26680\">The principal caveat is light-load behavior: when the phase shift is small, the inductor current may be insufficient for ZVS, and wide-bandgap devices that hard-switch can ring and dissipate. This is precisely why the modulation strategy and the device choice must be co-designed and co-validated\u2014and why light-load operating points deserve dedicated test cases in any dual active bridge simulation campaign.<\/p><h3 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"182:1-182:58;26682-26739\">Dual Active Bridge Simulation and Real-Time Validation<\/h3><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"184:1-184:257;26741-26997\">A DAB design is not proven until its control is proven, and offline simulation alone cannot prove implementation-level correctness. Dual active bridge simulation has to progress through clearly staged steps, ending in real-time, closed-loop validation.<\/p><h4 class=\"text-text-100 mt-2 -mb-1 text-base font-bold\" data-sourcepos=\"186:1-186:64;26999-27062\"><span style=\"color: #d18100;\">Why the Dual Active Bridge Is Hard to Simulate in Real Time<\/span><\/h4><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"188:1-188:693;27064-27756\">Two properties make the DAB one of the most demanding converters to simulate in real time. First, it is operated at very high switching frequencies\u2014commonly 100 kHz and rising into the hundreds of kilohertz\u2014specifically to reduce the size and weight of the magnetics. Second, the fundamental harmonic of the transformer waveform equals the switching frequency, unlike grid-tied converters whose fundamental sits at 50 or 60 Hz. The DC-DC stage itself is therefore the hardest part of the converter to emulate accurately, because the simulator must resolve the carrier-level switching transitions, dead-time, and ZVS intervals that define the converter&#8217;s behavior\u2014not a slow averaged envelope.<\/p><h4><span style=\"color: #d18100;\">The Time-Step Requirement<\/span><\/h4><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"192:1-192:630;27789-28418\">For DAB switching frequencies in the tens to hundreds of kilohertz, the real-time platform&#8217;s simulation time step should be at least twenty to a hundred times smaller than the switching period. For a 100 kHz converter, that points toward time steps on the order of 100 nanoseconds or smaller. A practical benchmark worth remembering: when PWM or phase-shift sampling error climbs above roughly one percent, the time step is too coarse to trust the ZVS and current-stress results. The difference is stark\u2014a coarse step can produce sampling errors above twenty percent, while a sufficiently fine step holds error below one percent.<\/p><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"194:1-194:575;28420-28994\">This requirement generally rules out CPU-only HIL platforms, which are typically capped near 50 kHz, and points toward <strong>FPGA-based emulation<\/strong>. A sequential CPU cannot deterministically resolve carrier-level PWM and fast switching transients at these frequencies, whereas an FPGA computes the circuit equations in parallel and delivers deterministic, nanosecond-scale steps. Switch-level oversampling is also necessary, because more than one gate transition can occur within a single simulation step in DAB applications; without it, numerical subharmonics and error appear.<\/p><h3>The Validation Chain<\/h3><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"198:1-198:81;29022-29102\">A complete dual active bridge control validation program proceeds in stages:<\/p><ol class=\"[li_&amp;]:mb-0 [li_&amp;]:mt-1 [li_&amp;]:gap-1 [&amp;:not(:last-child)_ul]:pb-1 [&amp;:not(:last-child)_ol]:pb-1 list-decimal flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"200:1-203:146;29104-29928\"><li class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"200:1-200:101;29104-29204\"><strong>Offline simulation<\/strong> for topology design, modulation development, and control-loop gain tuning.<\/li><li class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"201:1-201:303;29205-29507\"><a href=\"https:\/\/impedyme.com\/hardware-in-the-loop\"><strong>Controller hardware-in-the-loop (HIL)<\/strong><\/a> testing, where the real controller hardware runs against an FPGA-emulated converter at signal level. This verifies firmware, PWM and phase-shift timing, mode-transition logic, and protection schemes\u2014pulling software bugs forward before any power is applied.<\/li><li class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"202:1-202:275;29508-29782\"><a href=\"https:\/\/impedyme.com\/powerhardware-in-the-loop\/\"><strong>Power hardware-in-the-loop (PHIL)<\/strong><\/a> testing, where real power is exchanged through a power amplifier with an emulated source and load, verifying the converter under full-power, closed-loop conditions\u2014pulling power-stage issues forward in a safe, repeatable environment.<\/li><li class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"203:1-203:146;29783-29928\"><a href=\"https:\/\/impedyme.com\/rcp-box\/\"><strong>Rapid control prototyping (HIL\/RCP-Box)<\/strong><\/a> for iterating new control algorithms on real hardware before committing them to the production controller.<\/li><\/ol><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"205:1-205:484;29930-30413\">Fault injection and power-reversal testing belong in this environment, not on a bench. Short circuits, voltage sags, grid faults, battery cell imbalance, and thermal-runaway scenarios can all be exercised safely and repeatably, with particular attention to charge-to-discharge transitions\u2014exactly where transient DC bias and current overshoot tend to appear. Running these fault campaigns as a regression gate on every firmware build turns one-off testing into an ongoing safety net.<\/p><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"207:1-207:358;30415-30772\">Finally, realistic sources and loads should be part of the test plan from day one. Replacing static bench supplies with emulated batteries and emulated grids exposes the DAB&#8217;s control loops to state-of-charge-dependent voltages, realistic impedance, and genuine disturbances\u2014the actual conditions under which the converter has to remain stable in the field.<\/p><h3 class=\"text-text-100 mt-2 -mb-1 text-base font-bold\" data-sourcepos=\"209:1-209:40;30774-30813\">Validating on the Impedyme Platform<\/h3><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"211:1-211:488;30815-31302\">Impedyme&#8217;s FPGA-based real-time platform is built for exactly this class of fast-switching converter. With a 90 ns time step and AMD\/Xilinx Zynq UltraScale+ processing, it resolves the carrier-level switching, dead-time, and ZVS behavior that coarser CPU-based systems average away. The full validation chain\u2014controller HIL, power HIL, and rapid control prototyping\u2014runs on one connected platform, so the same model an engineer tunes offline deploys to real-time hardware without rework.<\/p><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"213:1-213:323;31304-31626\">In practice, this is what lets a team verify SPS, EPS, DPS, and TPS mode transitions, confirm ZVS coverage across the full voltage and load range, catch transient DC-bias events during power reversal, and prove protection logic against injected faults\u2014all before the converter ever sees a live grid or a real battery pack.<\/p><h3 data-sourcepos=\"213:1-213:323;31304-31626\"><span style=\"color: #d18100;\">Real-Time Monitoring and Control in Practice<\/span><\/h3>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-083f1bd elementor-widget elementor-widget-video\" data-id=\"083f1bd\" data-element_type=\"widget\" data-settings=\"{&quot;video_type&quot;:&quot;hosted&quot;,&quot;autoplay&quot;:&quot;yes&quot;,&quot;play_on_mobile&quot;:&quot;yes&quot;,&quot;loop&quot;:&quot;yes&quot;,&quot;controls&quot;:&quot;yes&quot;}\" data-widget_type=\"video.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"e-hosted-video elementor-wrapper elementor-open-inline\">\n\t\t\t\t\t<video class=\"elementor-video\" src=\"https:\/\/impedyme.com\/wp-content\/uploads\/2025\/04\/Dualactivebridge.mp4\" autoplay=\"\" loop=\"\" controls=\"\" playsinline=\"\" controlsList=\"nodownload\"><\/video>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0c8ff9c elementor-widget elementor-widget-text-editor\" data-id=\"0c8ff9c\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"219:1-219:506;31906-32411\">The dashboard above shows what real-time dual active bridge control looks like from the operator&#8217;s seat on the Impedyme platform. From a single interface, an engineer sets the reference voltage and the PI controller gains (Kp and Ki) on the fly and immediately sees the effect: the output voltage tracking its setpoint, the load current and power settling, and the grid-side voltage and current responding in real time. There is no recompile-and-rerun cycle\u2014gains are tuned against live hardware behavior.<\/p><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"221:1-221:589;32413-33001\">Two things make this more than a visualization. First, the protection layer\u2014over-current, over-temperature, and over-voltage flags with a converter on\/off control\u2014runs in the loop, so fault response can be exercised safely rather than assumed. Second, every quantity that matters for dual active bridge control is observable at once: reference tracking, load power, and grid current are all on screen together, which is exactly what it takes to confirm ZVS coverage, catch transient DC-bias events, and validate mode transitions before the converter is connected to a real source or load.<\/p><h3 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"223:1-223:62;33003-33064\">Practical Guidance for Dual Active Bridge Control Programs<\/h3><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"225:1-225:576;33066-33641\">Choosing a modulation scheme should follow directly from the operating envelope. If a design runs near a unity voltage ratio at fairly steady load, SPS may be adequate. Any application spanning a wide voltage range or significant light-load operation\u2014EV charging, battery storage\u2014should budget from the outset for EPS, DPS, or TPS, treating the resulting mode transitions as test cases in their own right. A useful trigger for escalating to a more sophisticated scheme is whenever light-load efficiency or ZVS coverage falls short of target across the required voltage range.<\/p><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"227:1-227:389;33643-34031\">Validation should proceed in staged steps: offline modeling for design and gain tuning, then deployment of that same model to FPGA-based real-time hardware for controller HIL testing of firmware and timing, and only then <a href=\"https:\/\/impedyme.com\/software\/\">power HIL testing<\/a> for full-power closed-loop verification. Offline simulation alone should never be treated as sufficient evidence of implementation-level correctness.<\/p><p class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"229:1-229:403;34033-34435\">Fault injection and power-reversal testing should be mandatory, not optional, with particular attention to charge-to-discharge transitions. And time-step adequacy deserves explicit scrutiny rather than being taken on faith: for switching frequencies in the tens to hundreds of kilohertz, an FPGA-based platform with a sufficiently fine time step is the only way to trust ZVS and current-stress results.<\/p><h2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"231:1-231:30;34437-34466\"><span style=\"color: #d18100;\">Frequently Asked Questions<\/span><\/h2><p><strong>What is dual active bridge control?<\/strong><\/p><p>Dual active bridge control regulates power and voltage by commanding the phase shift between the two bridges&#8217; square-wave voltages. The phase difference sets a voltage across the series inductor that drives current and transfers power; the direction and magnitude of power depend on the sign and size of that phase shift.<\/p><p><strong>At what phase shift is power transfer maximized?<\/strong><\/p><p>Maximum active power transfer occurs at a normalized phase shift of one-half, corresponding to a ninety-degree phase displacement between the primary and secondary square waves. Operating beyond ninety degrees is avoided because power sensitivity reverses and circulating currents grow.<\/p><p><strong>What causes transient DC bias and how is it prevented?<\/strong><\/p><p>Abrupt phase-shift changes\u2014during load steps or power-flow reversal\u2014can create a volt-second imbalance that injects a DC offset into the transformer flux and inductor current, risking core saturation and overcurrent. It is mitigated through duty-cycle modulation, predictive flux balancing, double-sided SPS, soft-start, and precise dead-time control.<\/p><p><strong>What is the difference between HIL and PHIL for dual active bridge validation?<\/strong><\/p><p>Controller HIL tests the real controller against a signal-level emulated converter to verify firmware, timing, and protection logic. Power HIL exchanges real power through an amplifier with emulated sources and loads to verify full-power, closed-loop behavior. HIL pulls software bugs forward; PHIL pulls power-stage issues forward.<\/p><p><strong>What efficiency can a dual active bridge achieve?<\/strong><\/p><p>With proper design and wide-bandgap devices, well-designed DAB converters reach peak efficiencies above 98 percent, with the best SiC and GaN designs approaching 99 percent. Efficiency is highest near a matched voltage ratio and degrades at light load or large voltage mismatch under simple SPS control.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e6125e7 elementor-align-center elementor-widget elementor-widget-button\" data-id=\"e6125e7\" data-element_type=\"widget\" data-rp-stop=\"true\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/impedyme.com\/contact\/\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Request a Demo<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-57472ea e-con-full e-flex e-con 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validation.<\/p>","protected":false},"author":6,"featured_media":2387,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"elementor_header_footer","format":"standard","meta":{"_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","footnotes":"","_members_access_role":[],"_members_access_error":""},"categories":[12],"tags":[],"class_list":["post-2456","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-application-knowledge"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.1 (Yoast SEO v28.1) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Dual Active Bridge Control: Modulation &amp; Simulation | Impedyme<\/title>\n<meta name=\"description\" content=\"A complete guide to dual active bridge control: topology, SPS\/EPS\/DPS\/TPS modulation, ZVS, and real-time dual active bridge simulation with HIL\/PHIL 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