An improved full-bridge zero-voltage-transition PWM DC/DC converter with zero-voltage/zero-current switching of the auxiliary switches

In this paper, an improved full-bridge (FB) zero-voltage-transition (ZVT) PWM DC/DC power converter topology is proposed. The proposed FB-ZVT PWM DC/DC power converter has the advantage of achieving zero voltage and zero current switching of the auxiliary switches using an auxiliary network. The auxiliary network is simply composed of a saturable inductor, auxiliary capacitors and auxiliary diodes. With the help of the proposed auxiliary network, the improved FB-ZVT PWM DC/DC power converter has much improved characteristics with respect to the overall system efficiency. The operation principles are explained in detail and several interesting simulation and experimental results verify the validity of the proposed circuit from a 83 kHz, 1 kW prototype power converter using IGBTs