Fortunately, this defect can be overcome in the FB-ZVZCS-PWM converter, which the freewheeling current can be attenuated to zero and maintained so that the lagging leg can realize ZCS.

• 采用FB-ZVZCS-PWM变换器可克服这一问题,它在超前臂关断后,将原边环流电流衰减到零并保持,使滞后臂实现零电流开关。