In order to optimize the efficiency of three-phase inverter

a three-phase resonant inverter with low-loss auxiliary circuit is proposed

in which auxiliary circuit is set up on the bridge arm of each phase. When the auxiliary resonant circuit works in the commutation process of the inverter

the main switches can achieve zero-voltage soft-switching

and the auxiliary switches can achieve zero-current soft-switching. The switching loss is obviously reduced. In addition

after the resonance state of the auxiliary circuit ends

the remaining electric energy in the resonant inductance will be fed back to the energy-storage capacitance through only one diode

reducing the loss of the auxiliary circuit when the electric energy is fed back

which is beneficial to the realization of the low-loss of the auxiliary circuit. In this paper

the working flow of the circuit is illustrated. The experimental waveforms show that both the main switch and the auxiliary switch achieve soft-switching. The research findings have reference for the research and development of high-efficiency three-phase inverter.