一种软开关交错式三电平逆变电路的研究

通过在传统三电平逆变电路的上、下功率管上各并联一个交错式工作的功率管,构成一种输入输出纹波电流倍频的交错式三电平逆变电路。描述了该电路的PWM方式,通过在各交错并联的功率管支路上串联一个限流电感,实现了交错并联各功率管的零电流开通,并降低了续流二极管的反向恢复电流。阐述了电路各阶段的工作原理,分析了限流电感值的影响及设计问题。同理推导得出另一种软开关交错式NPC逆变电路。设计了一台2kVA的样机,实验波形验证了理论分析的正确性。

Study on a Soft-switching Interleaved Three-level Inverter

By adding an interleaved parallel power semiconductor at the upper and lower location in the traditional three-level inverter,an interleaved three-level inverter is realized with input and output double-frequency current and its PWM method is proposed.By inserting a limiting-current inductor in the interleaved power semiconductor branch,the interleaved power switches can realize zero-current turn on and the reverse recovery current of freewheeling diode is reduced.The theory of each operating stage is elabo...