An improved ZVS partial series resonant DC/DC converter with low conduction losses

This paper presents an improved ZVS partial series resonant DC/DC converter (PSRC) with low conduction losses, suitable for high power and high frequency application. The proposed PSRC has advantages of zero-voltage-switching (ZVS) of the main switches for entire load ranges and low conduction losses of the main switches by decreasing current stresses. Also, reduction of the effective duty cycle does not occur during resonant period of the main circuit because the auxiliary circuit of the proposed converter is placed out of the main power path. The auxiliary network is only composed of passive components including the auxiliary inductor, auxiliary capacitors, auxiliary diodes and saturable inductor. Therefore, an improved ZVS PSRC has improved characteristics with respect to the overall system efficiency. The operation principles of the proposed converter are explained in detail and the validity of the proposed converter is verified by several interesting simulated and experimental results.