Auxiliary Resonant Commutated Pole Inverter Without Change of Neutral Point Potential

A novel auxiliary resonant commutated pole soft-switching inverter was proposed to realize a three-phase soft-switching inverter which has a simple topology and high reliability.A high frequency transformer was used to divide the voltage in the DC side in half.It avoided the bulk capacitor and there was no center tap potential variation problem,which realized reliably zero-voltage turn-on of main switches and zero-current turn-off of auxiliary switches,reduced reverse recovery losses of diodes.Furthermore,a reset circuit of magnetizing current in the transformer was used to protect auxiliary switches.The equivalent circuits at different operation modes,the analysis of the circuit and principle of parameter design were presented.A 1 kW laboratory prototype had been built.Experimental results were proposed to confirm validity of soft-switching inverter presented.