变压器辅助换流的三相节能型谐振极逆变器

在谐振极软开关逆变器辅助电路的换流过程中，为避免剩磁通的累积导致变压器铁心饱和，提出了一种变压器辅助换流的三相节能型谐振极逆变器的拓扑结构，在二极管反向阻断的作用下，变压器的磁化电流无法形成稳态环流，从而使变压器中的能量全部向负载转移，磁化电流最终变化到零，实现了变压器的去磁复位.此外，逆变器的主开关和辅助开关可以分别完成零电压软切换和零电流软切换.分析了电路的换流过程.实验结果表明逆变器的开关器件完成了软切换，变压器磁化电流能减小到零.该拓扑结构对于研发高性能谐振极逆变器具有一定的参考价值.

Three-Phase Energy-Saving Resonant Pole Inverter with Transformer-Assisted Commutation

In the commutation process of auxiliary circuit in the resonant pole soft-switching inverter,the accumulation of remanence can lead to saturation of transformer core.To avoid this case,the article proposes a novel topology of three-phase energy-saving resonant pole inverter with transformer-assisted commutation.Under the effect of diode reverse blocking,the magnetizing current of the transformer is unable to form a steady state circulation so that all the energy in the transformer is transferred to the load.The magnetizing current changes to zero,which realizes demagnetizing and resetting function of transformer finally.In addition,the main switch and auxiliary switch of the inverter can achieve zero-voltage soft-switching and zero-current soft-switching respectively.The article analyzes the commutation process.The experimental results show that the switching devices of the inverter have achieved soft switching and the magnetization current of the transformer can reduce to zero.The topology has a certain reference value for the development of the high-performance resonant pole inverter.