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<p>This paper presents a bidirectional full-bridge DC–DC converter, designed for vehicle-to-grid (V2G) applications, that features a novel resonant active‑clamp architecture. The proposed design significantly reduces the voltage stress across the clamp capacitor while preserving the core functionalities of conventional active‑clamp circuits. This is done by suppressing oscillatory voltages across the rectifier diodes and eliminating the freewheeling circulating current. The converter achieves soft‑switching conditions by integrating a resonant operation between the clamp capacitor and the leakage inductance of the transformer and employing a hybrid control strategy that combines phase‑shift modulation with active‑clamp switching. Specifically, it enables near-zero current switching (ZCS) for the leading-leg switches and suppresses reverse recovery currents in the rectifier bridge. Full‑range zero‑voltage switching (ZVS) for both leading and lagging legs is attained through a magnetizing current that remains stable despite load fluctuations. A 3.3&#xa0;kW experimental prototype operating with a 400&#xa0;V DC link and a battery voltage range of 250–420&#xa0;V validates the proposed design. Test results confirm high efficiency, achieving 98.2% during charging (buck mode) and 97.6% during discharging (boost mode).</p>

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Bidirectional full-bridge converter with hybrid phase-shift control and resonant active clamp circuit for V2G applications

  • 期刊论文

  • 发表日期：

    2026年1月5日

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  • Hai-Nam Vu,
  • Zeeshan Waheed,
  • Woo-Jin Choi

摘要

This paper presents a bidirectional full-bridge DC–DC converter, designed for vehicle-to-grid (V2G) applications, that features a novel resonant active‑clamp architecture. The proposed design significantly reduces the voltage stress across the clamp capacitor while preserving the core functionalities of conventional active‑clamp circuits. This is done by suppressing oscillatory voltages across the rectifier diodes and eliminating the freewheeling circulating current. The converter achieves soft‑switching conditions by integrating a resonant operation between the clamp capacitor and the leakage inductance of the transformer and employing a hybrid control strategy that combines phase‑shift modulation with active‑clamp switching. Specifically, it enables near-zero current switching (ZCS) for the leading-leg switches and suppresses reverse recovery currents in the rectifier bridge. Full‑range zero‑voltage switching (ZVS) for both leading and lagging legs is attained through a magnetizing current that remains stable despite load fluctuations. A 3.3 kW experimental prototype operating with a 400 V DC link and a battery voltage range of 250–420 V validates the proposed design. Test results confirm high efficiency, achieving 98.2% during charging (buck mode) and 97.6% during discharging (boost mode).