A Comparative Study of Compensation Topologies for Capacitive Power Transfer based on Sensitivity Analysis

This paper analyzes higher order compensation topologies which are extended from basic second-order compensation of capacitive power transfer (CPT) converters using a T-type circuit model. The system sensitivity to various parameters’ fluctuation of various CPT compensation topologies is analyzed and compared. Results from sensitivity analysis provide a convenient design guide for selecting parameters and compensation circuits to achieve the required load-independent (LI) operation for CPT systems with fewer design constraints. Moreover, the analysis effectively reveals the roles of extra components in higher order compensation compared with second-order compensation in making the whole system less sensitive, and hence provides a fast understanding of the choice of compensation circuits of different orders for applications addressing wide ranges of coupling and compensation parameter changes.