A ZVS PWM half-bridge inverter with active clamping technique using reverse recovery energy of the diodes

This paper presents a ZVS PWM half-bridge inverter with active voltage clamping technique using the reverse recovery energy of the diodes. The structure use only a single auxiliary switch and is particularly simple and robust. It is very attractive for single-phase high power applications. Switching losses are reduced due to implementation of the simple active snubber circuit, that provides ZVS conditions for all switches, including the auxiliary one. Its main features are: Simple control strategy, robustness, lower weight and volume, lower harmonic distortion of the output current, and high efficiency. The principle of operation for steady-state conditions, mathematical analysis and experimental results from a laboratory prototype are presented.