Receiver Side Control for Efficient Inductive Power Transfer for Vehicle Recharging

This thesis presents a new wireless inductive power transfer topology using half bridge current fed converter and a full bridge active single phase rectifier. Generally, the efficiency of inductive power transfer system is lower than the wired system due to higher power loss in inductive power transfer coils. The proposed converter reduces these limitations and shows more than 4% overall efficiency improvement comparing with such system in battery charging of low-voltage light-load electrical vehicles such as passenger cars, golf carts etc. This is realized by synchronous rectification technique of the vehicle side converter. Simulation results obtained from Matlab Simulink are included to validate the analysis and performance of the proposed converter. A scale-down 250 W lab prototype is developed and experimental results are presented to verify the comparative study results

Control of wireless power transfer system for dynamic charging of electric vehicles

L'abstract è presente nell'allegato / the abstract is in the attachmen

Challenges of Inductive Electric Vehicle Charging Systems in both Stationary and Dynamic Modes

Inductive power transfer as an emerging technology has become applicable in wide power ranges including Electric Vehicle, Electric Aircraft, wheelchair, cellphone, scooter and so on. Among them, inductive Electric Vehicle (EV) charging has gained great interest in the last decade due to many merits namely contactless technology, more convenience, full automotive charging process. However, inductive EV charging systems could bring about so many issues and concerns which are addressed in this dissertation. One of the critical challenges addressed in this dissertation is a virtual inertia based IPT controller to prevent the undesirable dynamics imposed by the EVs increasing number in the grid. Another adverse issue solved in this dissertation is detecting any metal object intrusions into the charging zone to the Inductive Power Transfer (IPT) systems before leading to heat generation on the metal or risk of fire. Moreover, in this dissertation, a new self-controlled multi-power level IPT controller is developed that enables EV charging level regulation in a wide range of power; suitable for different applications from golf-cart charging system (light duty EV) to truck (heavy duty EV). The proposed controller has many merits including easy to be implemented, cons-effective, and the least complexities compared to conventional PWM methods. Additionally, in this dissertation, the online estimation of IPT parameters using primary measurement including coupling factor, battery current and battery voltage is introduced; the developed method can find immediate applications for the development of adaptive controllers for static and dynamic inductive charging systems. Finally, the last objective of this research is physics-based design optimization techniques for the magnetic structures of inductive EV charging systems for dynamic application (getting charged while in motion). New configuration of IPT transmitting couplers with objective of high-power density, low power loss, low cost and less electromagnetic emission are designed and developed in the lab