50 W有源钳位ZVS变换器的设计

摘要

In view of the problem of energy loss in switching mode power supply, this paper discusses the basic working process of boost active clamp circuit,and the feasibility of the VVS of the main switch is proved by simulation.Based on the above conclusions, a prototype of 50 W is designed to realize the VVS turn-on and ZVS off of the main switch.Through the analysis of the loss and the working waveforms, the active clamp soft switching circuit can effectively reduce the power consumption,which boosts conversion efficiency.%针对现今开关电源能量损耗问题,文中论述了boost型有源钳位电路的基本工作过程,并通过仿真证明了主开关管VVS导通的可行性.基于以上推论设计了一款50 W的原理样机,实现了主开关管的VVS导通与ZVS关断.经损耗分析与工作波形表明,有源钳位软开关电路可以有效降低功耗,提升转换效率.