具有低能耗辅助电路的三相谐振极逆变器

为优化三相逆变器的效率，提出了一种具有低能耗辅助电路的三相谐振极逆变器，其各相桥臂上分别设置了辅助电路.在辅助电路工作时，主开关可实现零电压软切换，辅助开关可实现零电流软切换，使开关损耗明显降低.此外，在辅助电路的谐振状态结束之后，谐振电感中的剩余电能将只通过1个二极管回馈给储能电容，降低了电能回馈时的辅助电路损耗，有利于实现辅助电路的低能耗.说明了电路的工作流程。实验波形显示主开关和辅助开关能完成软切换.该研究成果对于研发高效率三相逆变器具有参考意义.

Three-Phase Resonant Pole Inverter with Low-Loss Auxiliary Circuit

In order to optimize the efficiency of three-phase inverter,a three-phase resonant inverter with low-loss auxiliary circuit is proposed,in which auxiliary circuit is set up on the bridge arm of each phase.When the auxiliary resonant circuit works in the commutation process of the inverter,the main switches can achieve zero-voltage soft-switching,and the auxiliary switches can achieve zero-current soft-switching.The switching loss is obviously reduced.In addition,after the resonance state of the auxiliary circuit ends,the remaining electric energy in the resonant inductance will be fed back to the energy-storage capacitance through only one diode,reducing the loss of the auxiliary circuit when the electric energy is fed back,which is beneficial to the realization of the low-loss of the auxiliary circuit.In this paper,the working flow of the circuit is illustrated.The experimental waveforms show that both the main switch and the auxiliary switch achieve soft-switching.The research findings have reference for the research and development of high-efficiency three-phase inverter.