Soft-switching two-switch flyback converter with wide range

A novel soft-switching two-switch flyback converter with wide duty cycle range is proposed in this paper. Compared with conventional two-switch flyback converter, it employed an auxiliary switch and a clamp capacitor to instead of two reset diodes. Therefore, its duty cycle can exceed 0.5, soft switching operation can be achieved easy for all switches and voltage stress across main switches are clamped at 1/2V_in, voltage stress across auxiliary switch is clamped at V_in. Analysis of steady-state and simulation result verified above performance. So that it is very suitable for high input, high efficiency application.