A resonant DC link soft-switching inverter was proposed to realize an inverter which has a simple topology

an easy control strategy

high efficiency and high power density.Auxiliary resonant unit was added to DC link of conventional inverter to make DC-bus voltage decrease to zero periodically

which realized zero-voltage operation of all switching devices in inverter.Furthermore

the switching device in the auxiliary resonant unit could be turned on under zero-current and turned off under zero-voltage.In addition

because only one auxiliary switch was in the auxiliary resonant unit

control strategy was relatively simple and cost of hardware was lower.The operation principle was analyzed.The equivalent circuits at different operation modes and conditions for realization of soft-switching were presented.A 1kW laboratory prototype had been built.Experimental results were proposed to confirm validity of soft-switching inverter presented.