移相全桥软开关变换器拓扑分析

Topology Analysis of Phase-shifted Full-bridge Soft-switching Converter

移相全桥软开关变换器从基本的移相全桥(FB)零电压(ZVS)脉宽调制(PWM)变换器,发展到移相全桥零电压零电流(ZVZCS)PWM变换器,及移相全桥零电流(ZCS)PWM变换器,进而又产生一系列其它新型的移相全桥电路,构成了这一类很具有发展和应用前景的变换器.比较分析了上述3类主要的移相全桥软开关变换器的拓扑结构、工作特点和各自的优缺点.改进的FB-ZVS-PWM变换器扩大了滞后臂ZVS负载范围.FB-ZVZCS-PWM变换器解决了滞后臂软开关负载范围问题,滞后臂较适合用绝缘栅极双极型晶体管(IGBT).FB-ZCS-PWM变换器可以实现各个功率管的ZCS,更适合大功率场合.

Phase-shifted full-bridge （FB） soft-switching converters are developing form the basic phase-shifted FB-ZVS-PWM converter to phase-shifted FB-ZVZCS-PWM converter and phase-shifted FB-ZCS-PWM converter,to a series of the other new phase-shifted full-bridge circuits ,which make up of the converters with developmental and useful foreground. The topology structures, operation characteristics, as well as their merits and demerits are compared and analyzed. The improved phase-shifted FB-ZVS-PWM converter enlarge the load range of ZVS in lag-arm. Phase-shifted FB-ZVZCS- PWM converter solves the problem mentioned above, and insulated gate bipolar transistor （IGBT） is fit for the lag-arm. Phase-shifted FB-ZCS-PWM converter could achieve ZCS in every power tube, and is used in high-power occasion. What＇ s more, the developmental trend of soft-switching converting technic without resonance network is pointed out.