A new family of soft-switching DC-DC PWM converters using a true ZCZVT commutation cell

In this paper, a new family of DC-DC PWM power converters is introduced using a true zero current and zero voltage transition (ZCZVT) commutation cell. The soft-switching technique utilized provides zero current switching (ZCS) and zero voltage switching (ZVS) simultaneously, at both turn-on and turn-off of the main switch and ZVS for the main diode. The family of ZCZVT PWM power converters is obtained from a common equivalent circuit of ZCZVT PWM power converters and the ZCZVT PWM boost converter is analyzed, simulated and implemented. The construction of state-plane diagram is demonstrated, which is obtained by using a proper state variable transformation. Based on the commutation analysis and the relations between the most important circuit parameters, design guidelines and a design example are presented. Experimental results, taken from a laboratory prototype rated at 1 kW, input voltage of 155 V, output voltage 340 V and operating at 40 kHz are given. The measured efficiency at full load was 97.9%