240 W全桥移相ZVS变换器的设计

移相全桥零电压变换器在中大功率场合中得到了广泛的应用,但其滞后臂只能在较窄的负载范围内实现软开关,并且其输出整流二极管反向恢复时产生严重的寄生振荡,二极管上存在很高的尖峰压.而文献[1]中变换器的滞后臂利用励磁电感电流可以在较宽的负载范围内实现软开关.变压器的漏感与电容的谐振可以减小整流管的电流应力和导通损失.基于此变...

Design of a 240 W full-bridge converter with phase shift control and zero voltage switching

The phase-shifted full-bridge zero-voltage-switching (PS-FB-ZVS) PWM converter is widely used in medium and high power levels.However,there are two problems existing in this kind of converter:one is that lagging leg has narrow zero-voltage-switching ranges,and the other is that the output rectifier diodes suffer the parasitic oscillation and voltage spike resulted by the reverse recovery of the rectifier diodes.The converter discussed in the literature one had wide zero-voltage-switching ranges of lagging leg switches by using the magnetizing current.In addition,the resonance between the leakage inductor of the transformer and the rectifier capacitors could reduce the current stresses of the rectifier diodes and conduction losses.Based on the principle of the converter,one 240 W zero-voltage-switching (ZVS) soft-switching power supply on the phase shift control was designed.The procedures of main circuit design were presented.The experimental waveforms were given in the end.