Abstract
Capacitive power transfer (CPT) technology is a newly emerging research focus for EV charging applications. Due to the absence of eddy current loss and light weight of the capacitive coupling metal plates, CPT technology is considered to be a promising alternative to the inductive power transfer (IPT) technology. In this paper, the recent designs of large-gap CPT systems designed for EV charging applications are summarized. And a graphical method based on Smith chart is proposed to analyze the characteristics of the compensation designs. With the design objectives graphically represented, the Smith chart can be used to visually analyze the performance of a compensation design, which could be helpful in multi-objectives design of the CPT system. The graphic features of three major design objectives on the Smith chart are investigated. Several guidelines of a good compensation design are concluded.
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