高频变压器分布电容的影响因素分析

反激变换器的高频运行表明功率变压器寄生参数对变换器的性能影响很大。变压器的寄生参数主要是漏感和分布电容，而设计过程中往往很少考虑分布电容。该文给出了适用于工程分析的变压器高频简化模型，分析高频高压场合变压器寄生参数对反激变换器的影响。继而给出寄生参数的确定方法，并基于此分析，提出控制寄生参数的工程方法，研究不同的绕组绕制方法和绕组位置布局对分布电容大小的影响，并通过实验验证了文中分析的正确性及抑制方法的实用性。

Effect Factors on Stray Capacitances in High Frequency Transformers

High-frequency operation of flyback converter shows that parasitic components associated with power transformer have great influences on the behavior of the converter. Leakage inductance and stray capacitance are two major parasitic components. But stray capacitance is seldom being considered in transformer design. A relative simplified transformer model for convenience in the engineering analysis was given after comparison of existing models. Then for high input voltage and low output voltage application, effects of parasitic winding capacitance on the operations of high-voltage, high-frequency flyback converter were analyzed and the influence of the way of winding strategy on winding capacitance was studied. At last, some experimental results were given, which verified the correctness of analysis and practicability of proposed suppression method.