电压型CPT系统输出品质与频率稳定性分析

Analysis of output quality and frequency stability for CPT system based on voltage source resonant converter

针对CPT系统能量传输能力与输出品质会随频率漂移产生较大波动的特点,在对电压型CPT系统工作原理的分析基础上,根据系统原副边的耦合关系建立系统的阻抗模型,分别总结在谐振条件下系统的输出特性和在失谐条件下系统的拾取端阻抗随频率变化的规律,提出较小的拾取端线圈电感值有益于电压型CPT系统的频率稳定;发现并证明了SP型CPT系统的拾取端至少存在两个谐振频率点和一个负载突变频率点,并给出了拾取端电感的取值范围,对系统的参数设计具有指导意义。最后以SP型CPT系统为实验平台验证了理论分析的正确性。

Abstract：Aiming at Contactless power transfer system energy transmission capacity and output quality producting large fluctuation caused by frequency drift, the principle of voltage type contactless power transfer system was analyzed, hnpedance model was established according to coupling relationship be- tween primary coil and secondary coil, and output characteristic under resonance condition and laws of pick up impedance change with frequency under detuning condition were summarized. The smaller im- pedance of pick-up coil is helpful for voltage type eontactless power transfer system frequency stability. There are at least two resonance frequency point and one load-mutation frequency point in SP type con- tactless power transier system, which were proved and found. Scope of pick-up coil impedance was deter- mined. These conclusions are helpful for system design. At last SP type contactless power transfer system was used as experiment platform to verified the theoretical analysis.