基于混合ZVS的不对称半桥变换器研究

Research on Asymmerical Half Bridge Converter Based on Hybrid ZVS Method

分析了传统不对称半桥变换器利用变压器原边串联谐振电感或变压器励磁电感能量实现零电压软开关的缺点,研究一种将谐振电感与励磁电感结合用于不同负载条件下的混合式软开关方式。分析该方式在轻载、半载和重载3种负载条件下的软开关过程,推导实现软开关的条件,探讨了谐振电感和励磁电感在不同负载条件下的作用机理。通过仿真和实验进行了验证,结果表明:该混合ZVS仅需要励磁电感值和较小的谐振电感就可实现宽负载范围内的软开关,软开关特性好、效率高。

The shortcoming of traditional asymmetric half bridge converter with transformer primary side series resonant inductor or transformer magnetizing inductance energy that achieve zero voltage soft switch was analyzed,one hybrid soft switching mode used resonant inductor and magnetizing inductance in under different load was researched.The soft switching process in light load and heavy load and half load conditions was analyzed,soft switching mechanism was investigated with resonant inductance and magnetizing inductance in different load. The results of simulation and experiment verify that the hybrid ZVS only needs magnetizing inductance and smaller resonant inductance to realize soft switching in wide load range,the soft switching characteristic is good and the efficiency is high.