Because hard switch has the disadvantages like huge switching loss, serious EMI and weakness in realizing high frequency DC/ DC converter adopts a Zero voltage switch control method of phase-shifted full bridge with a clamp diode in the primary side. 由于硬开关开关损耗大,EMI(电磁干扰)较严重,不利于实现高频化,因此,DC/DC变换器选用一种原边带箝位二极管的移相全桥ZVS(零电压开关)控制方式实现。