Analysis on topology and efficiency of soft-switching inverter

In view of large switching loss in the hard-switching inverter,a soft-switching inverter with simple control was proposed.There were no auxiliary switching devices in the new topology.In addition,there was a group of resonant inductors in every phase,so there was no mutual influence in resonant process.The topology and efficiency were theoretically analyzed in detail.The simulation results showed current had no sudden increase during turn on transient.The proposed soft-switching inverter could effectively reduce di/dt during turn on transient and du/dt during turn off transient.The resonant process of every phase was independent.The experimental results illustrated distortion ratio of line voltage and efficiency were improved,compared with hard-switching inverter.The proposed soft-switching inverter can reduce switching loss,enhance efficiency and quality of output waveforms.