The invention discloses a
zero voltage switch modulation method of a three-phase four-wire
system zero voltage switch
inverter. The
zero voltage switch modulation method of a three-phase four-wire
system zero
voltage switch
inverter includes the steps: comparing a
three phase main switch modulated wave of a three-phase four-wire
system zero
voltage switch
inverter with a sawtooth carrier wave; generating a main switch
signal through an inverter and a rising edge time-
delay module; comparing an auxiliary switch modulated wave of the three-phase four-wire system zero
voltage switch inverter with the sawtooth carrier wave; generating a leg straight-through
signal and an auxiliary switch
signal through the rising edge time-
delay module, the inverter and a falling edge time-
delay module; and applying the effect of the straight-through signal to a full control main switch during the commutation process of the full control main switch of the three-phase four-wire system zero voltage switch inverter to supply a freewheeling loop for magnetizing of a resonant
inductor so as to store enough
resonant energy. The zero voltage switch modulation method of a three-phase four-wire system zero voltage switch inverter is simple in structure, and can realize full range
soft switching in the
power frequency period. Besides, all the switching devices can realize
zero voltage switching so that the zero voltage switch modulation method of a three-phase four-wire system zero voltage switch inverter has low switching loss and high circuit efficiency, and can
restrict reverse recovery of a
diode and reduce
electromagnetic interference.