一种基于DSP的桥式变换器偏磁校正方案研究

A scheme to adijust magnetic bias in bridge converter based on DSP

分析了桥式变换器发生偏磁现象的原因,指出了传统的串入耦合电容或者检测电流峰值方法的局限性,提出了直接对伏秒值进行校正以消除偏磁的新方法.在功率高达20kW的变换器中,用所提出的方法进行校正,取得了良好的效果.

The reason of magnetic bias in bridge converter is introduced. The limitations of two (methods of) coupled capacitor and current pulse modulation in the full bridge converter are analyzed, thus a new method to adjust the voltage-time integration value directly is presented, by which the phenomenon of magnetic bias does not appear. The experiment shows the effect of this method when it is used to the bridge converter of 20 kW switch power.