推挽式零电压开关多谐振高频变换器的直流稳态分析

DC analysis of push pull zero voltage switched multiresonant converter

将零电压开关多谐振技术应用于推挽变换器电路，提出了一种推挽式零电压开关多谐振高频变换器（ＰＰＺＶＳ－ＭＲＣ）电路方案，较全面、完整地对其稳态工作模式和直流特性进行了分析，发现了变换器正常运行的４种工作模式。用自编制的ＰＰＺＶＳ－ＭＲＣ的计算机仿真程序，仿真研究了ＰＰＺＶＳ－ＭＲＣ电路中各处电压、电流的稳态变化规律以及电路的直流电压增益与开关频率的变化特性。设计并实现了输入４８Ｖ、输出５Ｖ、功率５０Ｗ的离线式ＰＰＺＶＳ－ＭＲＣ实验电路，通过实验验证了理论分析的正确性。

Under developing four different modes of operation of the push pull zero voltage switching multiresonant converter (PP ZVS MRC), a complete DC analysis is presented. A computer simulation is programmed to calculate the DC voltage conversion ratio characteristics and to facilitate the circuit design of the push pull multi resonant converter. A 50 W off line PP ZVS MRC is designed and implemented. The analysis is verified experimentally.