PEREE Phase-shift full-bridge ZVs PWM converter L L R R VD $4 Equivalent circuit during Equivalent circuit during t2 18Power Electron cs i 18 Phase -shift full shift full -bridge ZVS PWM converter bridge ZVS PWM converter iLr i L kT C :1 S1 S4 Lr L VD1 Ui Uo + CS2 VDS2 A R iLr i L CS3 S2 Lr L VD1 Ui Uo + CS4 VDS3 VD2 B R Equivalent circuit during Equivalent circuit during t3 ~ t4 Equivalent circuit during Equivalent circuit during t1 ~ t 2 4 2