偏磁及其抑制技术在全桥变换器中的作用分析

Function Analysis of Biasing and Its Restriction Technique in Full Bridge Converter

针对副边无源箝位全桥软开关脉宽调制变换器的结构特点,论述了变压器产生偏磁的主要原因、后果及传统偏磁抑制的方法。讨论了串隔直电容的方法用以偏磁抑制的可行性,提出了一种新型峰值电流偏磁抑制方案,新方案能够减小传统峰值电流控制方式误差,通过Matlab仿真结果表明该方法可以有效抑制偏磁。

Aiming at structural features of secondary side passive-clamped full-bridge soft switching pulse width modulation converter, this paper discussed the main cause and consequence of transformer in generation of bias and methods of traditional biasing suppression. Discussion was made to the feasibility to use series DC-blocking capacitor to suppress biasing, and a kind of new type peak current biasing suppression plan was raised. The new plan can reduce traditional peak current control method error. Matlab simulation result shows that the method can effectively suppress biasing.