基于动态方程的电流源感应耦合电能传输电路的频率分析

Frequency Analysis of a Current Source Inductively Coupled Power Transfer System Based on Dynamic Circuit Equations

分析了一种电流源感应耦合电能传输(inductivelycoupledpowertransfer,ICPT)系统的动态特性,着重探讨了电路的谐振频率。基于其一个周期内各阶段的状态方程,得到每个阶段各状态变量的通解,详细讨论了其不同的谐振频率。除了一个共有的频率之外,在变压器的一次、二次侧还分别有各自的谐振频率,该文根据实际参数的取值范围,得到频率在不同条件下的简化表达式。经分析,这两个频率在某些条件下只与各自这一侧的参数相关。对电路的参数设计给出了一些限制条件,实验验证了分析的结果。

Dynamic analysis on current source inductively coupled power transfer （ICPT） system is introduced, and resonant frequency of the circuit is discussed. Based on the circuit equations of each stage in operation cycle, the general solution of circuit state variables is obtained, which helps to analyze resonant frequencies of different stages. Besides a common frequency of the circuit, the other two are resonant frequencies of each side of the transformer. Simplified forms of the frequency expression in different conditions are obtained according to actual parameters. It is found that in certain circumstance, the resonant frequencies of primary and secondary side of transformer are different and depend only on elements of their respective sides. Some suggestions about parameter selection are provided. The analytical analysis and considerations are verified by a practical ICPT system.