中小功率三相高频节能型谐振直流环节逆变器

为使中小功率三相逆变器实现在高开关频率下的节能运行，首次提出了一种新型三相谐振直流环节逆变器拓扑结构.设置在逆变器直流环节的辅助电路参与换流过程时，桥臂输入端的直流环节电压能周期性形成零电压状态，主开关和辅助开关都能完成零电压软切换.在高频金属氧化物半导体场效应晶体管（Metal Oxide Semiconductor Field Effect Transistor，MOSFET）作为该逆变器的开关器件时，实现零电压软切换能消除MOSFET的容性开通损耗，有利于优化逆变器效率.文中分析了电路的工作流程.2.5kW样机上的实验结果表明开关器件都处于零电压软切换.因此，该拓扑结构对于研发高性能的中小功率三相逆变器具有参考价值.

Medium and Small Power Three-Phase High-Frequency Energy-Saving Resonant DC Link Inverter

In order to realize the energy-saving operation of medium and small power three-phase inverters at high switching frequency,a novel three-phase resonant DC link inverter topology is proposed for the first time.When the auxiliary circuit on the DC link of the inverter participates in the working process,the DC link voltage across the input end of the bridge arm can periodically form a zero voltage state,and the main switch and the auxiliary switch can achieve the zero-voltage soft-switching.When the high frequency metal oxide semiconductor field effect transistor is used as the switching device of the inverter,the zero-voltage soft switching can eliminate the capacitive turn-on loss of the MOSFET(Metal Oxide Semiconductor Field Effect Transistor),which is beneficial to optimizing the efficiency of the inverter.In this paper,the workflows of the circuit are analyzed.The experimental results on the 2.5kW prototype show that the switching devices are all at zero voltage soft-switching.Therefore,this topology has reference value for the development of high performance medium and small power three-phase inverters.