A parallel resonant DC link soft-switching inverter with a single storage capacitor-assisted commutation was proposed to reduce switching loss of the hard-switching inverter.The single storage capacitor was used to supply energy in the resonance process.DC-bus voltage decreased to zero periodically to realize zero-voltage operation of all main switching devices in inverter.Auxiliary switches were also operated under zero voltage switching or zero current switching in the commutation process.More storage capacitors were not between the DC buses and there was no center tap potential variation problem.The operation principle was analyzed via the phase-plane analysis technique.A 5kW laboratory prototype was built.The experimental results demonstrated that soft-switching operation of all main switching devices could be realized.Therefore

the soft-switching inverter presented can effectively reduce switching loss and improve efficiency.