“…The freewheeling diode of the switch tube provides conditions for the zero-voltage turn-on of the switch tube. When the freewheeling diode is turned on, the switch tube can be turned on at zero voltage [10]. The main circuit diagram of the phase-shifted full-bridge suspension chopper is shown in Figure 2, where VT1 and VT2 form the leading bridge arm and VT3 and VT4 form the lagging bridge arm,C1,C2, C3,C4 are capacitors in parallel with switching devices, where C1 = C2 = C12, C3 = C4 = C34.…”