Design of Soft Switch Power Supply Circuit with High Frequency

A double forward high frequency soft switching power supply for telecommunication is proposed in this paper.The leakage inductance of the transformer and a series connected capacitor are utilized to form the resonant tank; with the proposed design,zero-voltage / zero-current switching is achieved and system losses are significantly reduced. The proposed system is verified experimentally; the results reveals that the system design enables safe,reliable and highfrequency soft switching operation; and the prototype can achieve high efficiency and high power density. The maximum power output of the system is 500 W under 50 kHz switching frequency; the output voltage is 24 V with 93% efficiency at full power.