新型高效ZVZCS大功率全桥变换器的研究

移相控制零电压零电流开关（ZVZCS）变换器实现了开关管的零电压和零电流开关，消除了续流时的原边环流，降低了导通损耗，提高了变换器的效率和功率密度，特别适用于中大功率场合。论文简述了移相控制ZVZCS全桥变换器的工作原理。详细研究了原边加隔直电容和滞后臂串二极管的移相控制ZVZCS全桥变换器，并且给出了电路中各器件参数的计算方法，分析了软开关实现的条件。最后论文在电路仿真软件Pspice中设计了一个520V输入，200V、6kW输出的DC-DC变换器样机，仿真结果验证了理论分析与参数计算方法的正确性。

Zero-Voltage Zero Current-Switching （ZVZCS）converter achieves zero-voltage switching and zero-current switching, eliminating the primary circulation freewheeling, reducing conduction losses and improve the efficiency and power density converters, especially for high-power applications. In this paper we present the theory of ZVZCS works. We study the phase shift control ZVZCS full-bridge converter with adding a blocking capacitor in original and series diode in lagging arm and circuit parameters of each device, and analyze the soft-switching condition give the calculation method of the Finally in Pspice circuit simulation software, we design a 520V input, 200V, 6kW output DC-DC converter prototype and simulation results verify the correctness of the theoretical analysis and parameter calculation method.