基于辅助谐振换流的新型ZVS-PWM升压变换器

提出了一种基于辅助谐振换流的新型ZCS-PWM升压变换器,即通过采用简单的有源辅助谐振网络实现了主、辅开关管的软开关,主开关管实现了零电压零电流开通、零电压关断,开关管电流电压应力小,辅助开关管实现了零电压零电流关断、零电流开通,特别适用于以IGBT作为开关器件的高电压大功率场合.以其在Boost变换器的应用为例分析了它的工作原理、软开关实现条件,给出了谐振参数的设计方法,该软开关设计思想可以推广到其他基本的DC-DC变换器中.制作了一台使用IGBT的3 kW-16 kHz的实验样机,通过仿真和实验验证了该变换器的有效性.

Novel ZVS-PWM boost converter with auxiliary resonant commutation

A novel ZVS-PWM boost converter with active auxiliary resonant commutation is presented in the paper.Soft switching of the main switch and auxiliary switching can be achieved by using active auxiliary resonant net-work. The proposed converter has such advantages as zero-voltage and zero-current turn-on and zero-voltage turn-off for the main switch without increasing voltage and current stress, zero-voltage and zero-current turn-off and zero-current turn-on for auxiliary switching. It is very attractive for high power application where IGBT is predomi-nantly used as the power switch. Its operation principle is analyzed through its application to the boost converter. The condition of soft switching and the design considerations are analyzed in detail. The novel soft switching cell can be also used in other basic dc-dc converter. A 3 kW-16 kHz prototype which uses IGBT is made. The effectiveness of the proposed converter is confirmed by the simulation and experimental results.