松耦合全桥谐振变换器的传输特性研究

Study of the Transfer Characteristic in Loosely Coupled Inductive Power Transfer Full-bridge Resonant Converter

本文对基于非接触式感应电能传输技术的全桥谐振变换器的传输特性进行了研究。首先,文中以原副边均采用串联补偿为例进行分析,通过Matlab仿真计算,得出了这种情况下补偿电容的变化、负载的变化对原边谐振频率和传输特性的影响。其次,分析了发生频率分叉现象时工作频率该如何选择,并利用反映阻抗的概念分析了变换器的功率传输能力。最后,基于实验样机对文中的分析与结论进行了实验验证。

In this paper, the transfer characteristic of loosely coupled inductive power transfer full-bridge resonant converter is studied. Firstly, we obtain the conclusion that how the compensation capacitor and load influence on resonant frequency and transfer characteristic, making use of Matlab, taking the situation that primary and secondary compensation is series for example. Secondly, how to choose the switching frequency when bifurcation phenomena occurs is analyzed, besides, the transfer capability is also analyzed using the conception of reflection impedance. Finally, experimental results from a prototype of full-bridge converter are given,which verify the correctness of analysis and conclusion in the paper.