The design of an efficient class E-LCCL capacitive power transfer system through frequency tuning method

Abstract

In this work, the optimum zero voltage switching (ZVS) of Class E-LCCL capacitive power transfer (CPT) was determined via frequency tuning method. Through this an efficient system can be guanranteed although there is a change in the capacitive plates distance. This study used a Class-E LCCL inverter, as it can operate at a high alternate current frequency, besides producing low switching losses and minimal power losses. Specifically, this study conducted simulations and experiments to analyse the performance of an LCCL CPT System at 1 MHz operating frequency and 24 V DC supply voltage. Using an air gap distance of 0.1 cm, the designed CPT system prototype successfully achieved an output power of 10W and an efficiency of 95.45%. This study also found that by tuning the resonant frequency of the Class E-LCCL system, the optimum ZVS can be obtained although capacitive plate distance was varied from 1-3 cm via experimental. The results of this study could benefit medical implant and portable device development, consumer electronics, and environments that involve electrical hazards.

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“…The operation of class E inverter is regarded on the theory that the MOSFET acts as a switch to undergo zero voltage switching (ZVS) and convert the DC voltage to AC. Class E inverter is popular and commented to use due to its inherent robust, simple in design, and theoretically produces a 100% efficiency [18], [19]. In order to design class E inverter, the components should be first calculated using equations that are listed in [19].…”