Improved three switch-active clamp forward converter with low switching loss

The improved three switch-active clamp forward (3S-ACF) converter is proposed in this paper. The proposed converter has minimized switching loss on all switches of 3S-ACF converter by simple change of gate control scheme without any additional components. In addition, current stress of clamp diode can be significantly reduced. Though, all switches of the proposed converter have low voltage stress similarly to those of conventional 3S-ACF converter. Therefore, the proposed converter can be the most attractive candidate for high efficiency power supply in wide input applications.