An Efficient Single-Phase Full Bridge Passive SiC-Based Soft-Switching Inverter with Energy Feedback Function

To enhance the operation efficiency of single-phase full bridge inverter, a novel single-phase full bridge passive SiC-based soft-switching inverter topology is proposed. The passive auxiliary network (PAN) with low energy consumption is used to make the main switch achieve wide range pseudo zero-current switching (ZCS) switch-on and pseudo zero-voltage switching (ZVS) turn-off to implement economic power saving. There is no auxiliary switch in the PAN; a passive and lossless energy feedback cell is constructed to realize the reset of the absorption element by using the large capacity electrolyte capacitor as the constant voltage source; During the dead zone mode, the load current can continue to flow through the PAN, which can reduce the negative impact of the dead time state on the output current waveform of the proposed inverter. The experimental results on <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$3-\text{kW}$</tex> prototype with rated output power show that the switching device can realize soft-switching, and the distortion rate of the output current waveform of the inverter is improved.