Asymmetrical phase-shifted full-bridge

In comparison to forward-converters bridge topologies make use of parasitic components for resonant transition without need of additional clamping circuitry. Thus, they are privileged in building high frequency high power converters, even if high efficiency is required. This paper introduces a new modulation scheme for H-bridges, which combines PWM and phase-modulation. An analysis of the ideal circuit is presented together with design guidelines. Some experimental data for a converter prototype are given for 300 V/5 V-750 W, 250 kHz,