An Active-Clamping ZVS Interleaved Buck/Boost Bidirectional Converter With One Auxiliary Switch

This article introduces a zero voltage switching (ZVS) interleaved buck/boost bidirectional converter using the active-clamp technique. In the proposed converter, by utilizing a simple auxiliary circuit comprised of an auxiliary switch, an auxiliary inductor, and a clamp capacitor, ZVS condition is secured for both the boost and buck operation modes, regardless of the converter operating duty cycle or load condition. Furthermore, the converter can operate with the conventional fixed-frequency pulsewidth modulation (PWM) control procedure. The boost and buck modes of the proposed converter are analyzed in both conditions of D > 0.5 and D <; 0.5. To confirm the theoretical analysis, the experimental results of a 350 W-100 kHz prototype are presented.