Investigation of the constant‐voltage, constant‐current, and power characteristics of capacitive power transfer systems based on double‐CLC topology

Abstract

To achieve a power supply mode that can load constant current, constant voltage, and high power, there are some problems in capacitive power transfer (CPT) systems such as complicated control structure and poor control effects. To solve these problems, a new CPT system based on the double‐CLC topology is proposed, which can accurately calculate the frequency points of the multiresonance of the system and analyze different output characteristics of each resonance point; Hereby, taking the three‐phase wireless charging as an example, based on the switching of resonance points, a control mode to achieve constant‐current, constant‐voltage, and high‐power output of the system is proposed and studied. While not adding extra auxiliary circuits or increasing controlling complexity, it can meet some power demands of loaded constant current, constant voltage, and high‐power output. First, this article puts forward a new CPT circuit mode based on the double‐CLC topology. Then, through theoretical derivation, its multiresonance characteristics are analyzed; Third, by formula derivation and software simulations, the system power output and the relationship between load and frequency are achieved. Finally, using experimental measures, the operation performance of the CPT system based on the double‐CLC topology, in the case of multiresonance, was verified. © 2018 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

Research and Application of Capacitive Power Transfer System: A Review

“…Due to their easy control and high-power density, full-bridge inverters have become the most widely used power converters in CPT systems for medium and high-power applications. Full-bridge inverters can be further divided into voltage-type full-bridge inverters [33][34][35][36] and current-type full-bridge inverters [37,38] according to whether a large inductive element is used between the inverter and the DC voltage source. The voltage-type full-bridge inverter is composed of four identical MOSFETs in series and then in parallel.…”