A general PWM method for soft-switching three-phase power converters—Edge Aligned PWM (EA-PWM) is proposed. It aligns all the high loss commutation instants of the converter bridges in a switching cycle at the same instant so that all the switches of the three-phase converter can realize zero-voltage-switching (ZVS) with the help of the resonant auxiliary circuit which operates once each switching cycle. EA-PWM scheme for ZVS active-clamping three-phase converter is introduced. ZVS condition and voltage stress of the converters is derived. EA-PWM can adapt to various modulation methods such as SPWM, Harmonic Injected SPWM, Continuous Pulse Width Modulation (CPWM), Discontinuous Pulse Width Modulation (DPWM), etc. The ZVS condition of three-phase Compound Active Clamping (CAC) converter are discussed. Finally, EA-PWM scheme is verified in Back-to-Back (BTB) converter prototype.

中文翻译：

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零电压开关有源钳位三相功率转换器的通用脉冲宽度调制方法：边沿对齐脉冲宽度调制（EA-PWM）

提出了一种用于软开关三相功率转换器的通用PWM方法-边缘对齐PWM（EA-PWM）。它将转换器桥的所有高损耗换相时刻在一个开关周期中对齐，因此三相转换器的所有开关都可以借助谐振辅助电路实现零电压开关（ZVS）。每个开关周期运行一次。介绍了ZVS有源钳位三相变换器的EA-PWM方案。得出转换器的ZVS条件和电压应力。EA-PWM可以适应各种调制方法，例如SPWM，谐波注入SPWM，连续脉宽调制（CPWM），不连续脉宽调制（DPWM）等。三相复合有源钳位（CAC）转换器的ZVS条件为讨论过。最后，