双端变换器偏磁问题的研究

Research on Transformer Magnetic Bias of the Double-ended Converter

隔离型直流变换器通常应用于直接将电网电能进行变换或有特殊要求的场合,根据变压器铁心在磁化曲线上工作区域的不同,可以分成单端和双端变换器。通过对双端变换器直流偏磁问题的研究,利用TMS320F28335芯片ePWM模块的工作原理,介绍了一种新型的死区定时器控制方法,最后用该方法对双端推挽式电路进行实验,证明此方法用于抑制偏磁产生的可行性。

Isolated DC-DC converter is usually applied directly to the grid power transformation or specialrequirement,according to the different work area of the hysteresis loop of the transformer core,it can be divided intosingle-ended and double-ended converter.Through the study of the double-ended converter bias-magnetic problem,taking advantage of the working principle of e PWM module of chip TMS320F28335,a new dead- time controltechnique was presented. Finally,the experiment of controlling a double-ended circuit demonstrates the accuracy ofthis method.