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

Khairul Kamarudin Hasan,Nor Diyana Md Sin,Yusmarnita Yusop,Huzaimah Husin,Shakir Saat

doi:10.11591/ijece.v11i2.pp1095-1104

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.

Highlights

In this hyper-connected age, consumers demand less hassle when charging portable technology such as electric vehicles and mobile phones, and consider wires a major hindrance
Wireless power transfer (WPT) relies on power transmission that is not based on radiation, and mainly falls under three categories: acoustic energy transfer (AET), capacitive power transfer (CPT), and inductive power transfer (IPT), all of which are suitable for near-field applications [1,2,3,4,5,6]
It was found that the efficiency of the overall CPT system was affected by power losses in the rectifier, the transmitter unit and the variation in the capacitive coupling distance

Summary

INTRODUCTION

In this hyper-connected age, consumers demand less hassle when charging portable technology such as electric vehicles and mobile phones, and consider wires a major hindrance. A Class E-LCCL inverter was implemented for the capacitive power transfer (CPT) system to achieve high efficiency, to reduce the plate size, and to reduce the electric field emission during the transfer of energy from the transmitter to the receiver [25, 24]. To ensure precise results are obtained (i.e. system efficiency, power output, power input, and ZVS measurements), the components used in this study used exactly matched or were similar to that of the simulation circuit. This result is based on the following conditions: the coupling capacitance plate distance was set to 1mm and the load was 50 Ω, while the power was 10 W; both results indicate the system’s high efficiency in transferring power. The frequency tunung approach is proposed to get the optimum ZVS condition despite of the coupling capacitance plate’s distance

OPTIMUM ZVS DESIGN

Findings

CONCLUSION AND FUTURE WORK