Optimization of Non-uniform Planar Coils in Wireless Power Transfer Systems Using Resonant Converters

Abstract

The new era of mobility has pushed a rapid adoption of electric vehicles (EVs).Since then, many efforts have been made to make the experience of driving EVs more comfortable, including how to charge them. Wireless power transfer (WPT), also known as wireless charger, has caught much attention from researchers and industries since it is seen as a more practical and convenient way of charging EVs. This thesis will discuss a systematic approach to designing a WPT system, from the selection of the converter to the tuning process and coil design. It will also introduce a new approach to modeling the WPT coil. Using the new modeling, a mathematical optimization will be conducted to maximize the quality factor of the coils, which will increase the efficiency of the WPT systems. By Implementing the methodology explained above, a class Φ2 with optimized transmitter coils and receiving coils is selected for the WPT systems. A 230 V voltage level and 13.56 MHz frequency are selected as the operating conditions of the WPT systems. The WPT systems are fabricated and tested in burst mode. The experimental result confirms that the WPT system can deliver 1072 W output power with 96% efficiency over a 63 mm distance, which proves the effectiveness of this WPT system.