Design and development of electromagnetic models for wireless charging of electrical vehicles

Abstract

Electric vehicles (EVs) have been playing an important role recently, because of rising

oil prices and environmental concerns. One way of loosely coupled inductive power

transfer system is required to charge the battery of EVs. The fundamental principles of

such systems are identical to transformers.

In these systems, transformers with single-sided windings such as circular and ETD

models, and double-sided windings such as rectangular and H-shaped models are

simulated. These four models have been developed and compared for power transfer

efficiency. Moreover, series and parallel capacitors compensation are used to make

the equivalent circuit to be an ideal transfonner. A loosely coupled inductive power

transfer system for EVs needs to have a large air gap, good to tolerance to

misalignment, high efficiency, and compact. Based on these four criteria, different

simulations of these four models have been realized to find the best one. Besides, to

improve the power transfer efficiency, the electrical circuit, from voltage with normal

frequency to stable direct voltage to high frequency voltage, has also been designed.