单、三相正弦波逆变器偏磁抑制的有效方法

An effect method of avoiding magnetic-bias in single, three phase sine wave inverter

分析了导致SPWM逆变电源中直流偏磁问题产生的原因,对目前所采用抗偏磁方法进行了比较,提出了通过以各桥臂中点电压作为反馈来抑制直流偏磁的新方法。可适用于单、三相逆变电源抗偏磁设计。

By analyzing the causes of the magnetic-bias in the main transformer of the SPWM inverter, a new approach of avoiding magnetic-bias is presented. The bridge midpoint voltage is detected one by one, and is used as feedback signal to adjusting voltage into sinusoidal. This method can be used both single-phase inverter and three-phase inverter.