A single-phase full-bridge soft-switching inverter with passive device-assisted commutation is proposed to improve conversion efficiency of the single-phase full-bridge inverter. The soft-switching action of the switch devices is achieved by adding an auxiliary resonant circuit to bridge arms of the inverter. There is no auxiliary switch device in the auxiliary resonant circuit but few passive devices such as inductances

capacitances

diodes

and so on

which is helpful to reduce the cost of the auxiliary circuit and can't complicate the control strategy of the inverter. In addition

freewheeling of load current can be realized via the auxiliary circuit and the distortion ratio of output current waveforms of the inverter is reduced when the inverter is in the dead state

which reduces the effect of dead-time on the output current of the inverter. The operation process of the circuit is analyzed in detail. The experimental verification is carried out on a 4kW one-phase laboratory prototype. Experimental results verify that the switch devices of the inverter can achieve soft-switching in both light load and full load

the distortion ratio of output current waveforms of the inverter is improved. Therefore

the single-phase full-bridge soft-switching topology with passive device-assisted commutation has an important significance for improving the performance of inverter.