Study on LCC-C Wireless Power Transfer

This paper presents the study and analysis of the LCC-C Wireless Power Transfer (WPT). The study aims to understand the characteristic and behavior of the proposed resonant compensation under various variables such as the load, frequency, and coupling coefficient. This study can be used as a consideration for the selection of the compensation network for a specific purpose of WPT. To verify the theoretical analysis, numerical simulation has been performed for 3kW LCC-C WPT. It has been done for variable load and variable coupling coefficient. The results show that the maximum efficiency of the proposed WPT can achieve 94.9% at 53.3Ω output load (3kW output power) with k=0.3. The results suggest the important of the switching frequency selection for optimum operation.

I. Introduction

Wireless Power Transfer (WPT) has been drawn much attention from the researcher and industry this recent year. The range of application spans from the small power such as for mobile phones wireless charger to the high power capability such as for Electric Vehicles (EVs). Wireless power transfer has some advantages such as flexibility, safety, the susceptibility of dirt, dust, water, or other chemicals. It also enables in-motion charging system for transportation application [1], [2]. Since WPT is built up by using a loosely coupled inductor, the compensation circuit is very important to achieve a higher efficiency. Four basic types of compensation commonly used for WPT are Series-Series (SS), Series-Parallel (SP), Parallel-Series (PS), and Parallel-Parallel (PP) [3], [4]. These topologies can be extended by using the combination of the basic topology either for one side of WPT or both sides of WPT.