A composite soft-switching inverter configuration with unipolar pulsewidthmodulation control

This paper presents a new composite soft-switching configuration for single -phase inverters where power bridge leg modules are used. The presented con figuration consists of only one inductor and one capacitor as well as two l ow-power-rated switches/diodes for full-bridge circuits. It can realize snu bber functions and/or resonant zero current switching at any load current f or snitches in power inverters with unipolar sinusoid pulsewidth modulation control. The idea presented here Is that soft-switching processes at turn- on and -off for each active snitch in inverters can be different. The detai led circuit operational processes, simulation waveforms, and experimental r esults are included.