零电压开关PWM复合式全桥三电平变换器

该文提出一种零电压开关复合式PWM全桥三电平变换器，其中一个桥臂为三电平桥臂，另一个桥臂为两电平桥臂。三电平桥臂的开关管的电压应力为输入电压的一半，可在宽负载范围内实现零电压开关；两电平桥臂的开关管的电压应力为输入电压，它们利用变压器的漏感来实现零电压开关；该变换器的输出整流电压交流分量很小，可以减小输出滤波器，改善变换器的动态特性；其输入电流脉动很小，可以减小输入滤波器。该文详细分析该变换器的工作原理，讨论参数设计，并且给出实验结果。

ZERO-VOLTAGE-SWITCHING PWM HYBRID FULL-BRIDGE THREE-LEVEL CONVERTER

This paper proposes a Zero-Voltage-Switching PWM, Hybrid Full-Bridge Three-Level Converter (ZVS PWM H-FB TL converter), which has a three-level leg and a two-level leg. The voltage stress of the switches of the three-level leg is the half of the input voltage, and the switches can realize ZVS in a wide load range. The voltage stress of the switches of the two-level leg is the input voltage, and the switches can realize ZVS with the use of the leakage inductance of the transformer. The secondary rectified voltage is a three-level waveform having lower high-frequency content compared with that of the traditional full-bridge converters, which can reduce the output filter, and as a result, the dynamic response of the converter is improved. The input current of the converter has quite little ripple, so input filter can also be significantly reduced. The operation principle of the proposed converter is analyzed theoretically and verified by the experimental results.