一种新颖的零电压开关全桥逆变器

Novel zero voltage switching full-bridge inverter

提出了一种新颖的零电压开关全桥逆变器电路,在单H桥逆变电路的直流侧增加有源箝位软开关支路,可以实现所有开关管的零电压开通,同时由于谐振电感的存在,还可以抑制主开关管的反并联二极管反向恢复电流,从而降低逆变器的开通损耗和反向恢复损耗。本文较为详细地分析了电路实现软开关的各个过程,并从理论上计算了软开关实现条件,最后搭建了300W的实验样机进行了实验验证。

A novel zero voltage switching full-bridge inverter circuit is proposed. Only an active-clamp soft-switc-hing branch into the single H-bridge inverter circuit’ s dc link side is added, which can achieve zero-voltage switc-hing （ ZVS） of all switching devices, and inhibit the anti-parallel diode reverse recovery current of the main switc-hing devices to reduce the inverter switching losses and reverse recovery loss. This inverter can use common Pulse Width Modulation （ PWM） . At the same time the inverter can use less devices and simple structure. A detailed a-nalysis of the soft switching process is given, and theoretically calculate the requirement of the soft-switching branch. The operational waveforms of the inverter at positive half-cycle and the stage analysis of the inverter at posi-tive half-cycle are given to help understanding. Before the testing machine is built, the Saber simulation software is carried out to verify the correctness of the theoretical analysis. At last a 300W testing machine is built for experi-ment to test and verify.