中文摘要：

针对三相脉宽调制整流器开关损耗问题，研究了一种软开关三相整流器，可以只采用1个辅助开关，实现所有开关的零电压开通，并抑制二极管反向恢复。分析了软开关三相脉宽调制整流器的软开关过程，给出了谐振参数设计步骤，量化了主开关和辅助开关的通态损耗和开关损耗，设计了三相软开关整流器在电网电压不平衡条件下的控制策略，研制了40kW实验样机并完成了实验验证。

英文摘要：

In three-phase power factor correction converter, there exists severe switching loss. A zero voltage switching three-phase boost rectifier was researched. It used only one auxiliary switch and could realize zero voltage switching for all the switches and suppressed the diode reverse recovery current. The soft switching condition was analyzed and the design guide was proposed. The conduction loss and switching loss of the rectifier was calculated and the control strategy of the rectifier under unbalanced grid voltage condition was designed. A DSP controlled 40kW prototype was built to verify the theory.