aeRe 7.2 Classification of soft-switching techniques 4 Quasi-resonant soft-switching ZVS PWM(zero-voltage-switching PWM)and ZCS PWM(zero-current-switching PWM) ZVT PWM(zero-voltage-transition PWM) and ZCT PWM zero-current-transition PWM)Power Electron cs i 8 7.2 Classification of soft Classification of soft -switching switching techniques techniques Quasi -resonant soft resonant soft-switching switching ZVS PWM (zero ZVS PWM (zero -voltage voltage -switching PWM) and ZCS switching PWM) and ZCS PWM (zero PWM (zero -current current-switching PWM) switching PWM) ZVT PWM (zero ZVT PWM (zero -voltage voltage -transition PWM) and ZCT transition PWM) and ZCT PWM (zero PWM (zero -current current-transition PWM) transition PWM)