An improved full bridge zero-voltage switching PWM DC-DC converter using a two inductor rectifier

Abstract

An improved full bridge ZVS (zero-voltage switching) PWM (pulse-width-modulated) converter using a two inductor rectifier DC/DC power converter is presented. For this improved topology the main devices are switched on under ZVS conditions using the energy stored in the secondary filter inductors. It utilizes the low leakage inductance of a coaxial winding transformer to reset the currents in the rectifier diodes and eliminate the secondary voltage spike. The two-inductor rectifier has only one diode conduction drop in addition to frequency doubling in the output capacitor. The secondary-filter size in the proposed topology is rather small. The advantages of the new topology include a wide range with ZVS, no lost duty cycle due to diode recovery, no secondary voltage spikes, and to high power density and high efficiency.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>