用输出电感做谐振电感的软开关弧焊逆变电源

FB-ZVS-PWM变换器结合了PWM控制技术和零电压谐振技术的优点，但由于该电路借着功率开关元件的寄生电容和变压器的原边漏感形成谐振回路，只有在较大的负载电流时才能实现完全的零电压开关。本文通过在变压器副边增加两个饱和电感作为磁性开关，使输出滤波电感绐终反射到原边，参与谐振切换过程，在很小的电流下就实现了全负载下的零电压开关。上述研究结果通过计算机仿真和硬件试验得到了证实。

SOFT SWITCHING ARC WELDING POWER SOURCE USING OUTPUT FILTER INDUCTOR AS RESONANT INDUCTOR

Full-bridge zero-voltage switched PWM converter combines advantages of the PWM control technique and ZVS resonant technique.However,full ZVS is achieved only under large load current because resonant tank of this circuit is maked up of the parasitic capacitance of the power semiconductors and the leakage inductor of the transformer primary.Two saturable inductor as magnetic switch is added to secondary coil,so output filter inductor is always reflected to primary and assists resonant transition. Full ZVS is achieved under lower load current.The above mentioned investigated results is validated by the computerized simulation and hardware circuit experimentation.