An Efficient Three-Phase Resonant DC-Link Inverter With Low Energy Consumption

A novel three-phase resonant dc-link inverter with low energy consumption is presented to achieve efficient operation of the inverter. When the auxiliary resonant circuit is used to make the input voltage across bridge-arms become zero during every switching period, the main switching devices could achieve zero-voltage switching turn-on and zero-current switching turn-off. When the metal oxide semiconductor field effect transistor (MOSFET) or the insulated gate bipolar transistor (IGBT) is used as the main switching device, the lossless switching could be completed, and the capacitive turn-on loss caused by the internal junction capacitance of MOSFET and the turn-off loss caused by the tail current of IGBT are eliminated. The working process of the circuit and the realization condition of the soft-switching are analyzed. The experimental results on the three-phase prototype of 2.5 kW show that the switching devices achieve the soft-switching and the performance of the inverter is improved. Therefore, the novel topology is of great significance for improving the efficiency of the inverter.