High-Efficiency Synchronous Rectification Method Using Analog Phase Detection for EV Chargers

초록

High-efficiency synchronous rectification(SR) for electric vehicle (EV) wireless power transfer (WPT) systems having a simple analog sensing circuit is proposed in this paper. By detecting the phase of the input current through an all-pass filter and a lead compensator, the proposed method achieves SR duty control without the need for complex phase-locked loops (PLLs) in digital controllers. The variation in SR duty is theoretically proven to perform impedance transformation, thereby enabling flexible power regulation on the receiver side. The proposed concept is experimentally validated on an SAE J2954-compliant EV WPT prototype, demonstrating that the load power (PL) can be effectively regulated by adjusting the SR duty cycle. Owing to the proposed high-efficiency SR operation, the system achieves a 2% power efficiency improvement compared to the conventional diode rectifier on the receiver side. © 2026 IEEJ-IAS.

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