2018 | vol. 66 | nr. 4 | art. 4

Inductive Power Transfer for Charging the Electric Vehicle Batteries

Wireless power transfer (WPT) technologies have been developing rapidly in recent years. Advances in technology make WPT widely used in many applications. Electric vehicle (EV) contactless charging is an important application of WPT. Broadly, WPT categorized into radiative and non-radiative power transfer. Radiative power transfer is transmitting high power density, which is unsafe for humans when it is been used for EVs charging. So, only non-radiative power transfer technologies have been using to charge the batteries. Non-radiative power transfer includes inductive power transfer (IPT) and capacitive power transfer (CPT). Inductive charging technology is based on IPT. This paper covers a comprehensive review of an inductive charging system for EVs batteries. Operation principles, equivalent circuits modelling and power transfer requirements are presented. Some system design problems are also presented. Several compensation technologies and coil shape designs proposed to enhance inductive charging performance are also described. However, the air-gap between a charger and an EV, and the magnetic coupling between them are an area of concern. The stationary and dynamic charging methodologies have discussed briefly in this research. The most challenges and limitations of contactless EVs charging have been described in terms of: battery capacity, power level, air-gap, mileage, misalignment tolerance, efficiency, and interoperability. However, battery capacity can be enhanced by dynamic charging, the power level can be controlled, while some other limitations can be improved as discussed in this paper.
Keywords: wireless power transfer; inductive power transfer; battery charging; electric vehicles; coil configurations; misalignment tolerance; interoperability
To cite this article: AL-SAADI M., AL-OMARI A., AL-CHLAIHAWI S., AL-GIZI, A., CRĂCIUNESCU A., “Inductive Power Transfer for Charging the Electric Vehicle Batteries”, in Electrotehnica, Electronica, Automatica (EEA), 2018, vol. 66, no.4, pp.29-39, ISSN 1582-5175.