Transformer saturation and unusual system oscillation in capacitively coupled half-bridge or full-bridge forward converters: causes, analyses, and cures

R. Redl, N. Sokal, C.W. Schaefer
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引用次数: 33

Abstract

In capacitively coupled bridge converters, duty-ratio unbalanced can cause transformer saturation and resulting transistor destruction. Independently, modulation of the transistor storage time by variations of collector current can cause low-frequency system oscillation which leads also to transformer saturation, and additionally causes low-frequency conducted EMI which is difficult to filter. A resistor shunting the coupling capacitor is suggested as a simple but effective cure for both problems. Mathematical analyses for both phenomena, a design procedure for selecting the proper value of shunt resistance, and experimental results that confirm the analyses are presented.<>
电容耦合半桥或全桥正激变换器中的变压器饱和和异常系统振荡:原因、分析和处理
在电容耦合桥式变换器中,占空比不平衡会导致变压器饱和并导致晶体管损坏。另外,通过集电极电流的变化来调制晶体管的存储时间会引起低频系统振荡,从而导致变压器饱和,另外还会引起难以滤波的低频传导EMI。一个电阻并联耦合电容被建议作为一个简单但有效的解决这两个问题。文中给出了对这两种现象的数学分析、选择合适的分流电阻值的设计过程和验证分析的实验结果。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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