A 10 kW Inductive Wireless Power Transfer Prototype for EV Charging in Thailand
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Abstract
The electric vehicle (EV) market is rising despite the COVID-19 pandemic in Thailand and the rest of the world. The Energy Policy and Planning Office, Ministry of Energy, is supporting the development of EV charging stations in Thailand. However, recent research published by Thais on the subject does not involve more than 1.24 kW wireless power transfer (WPT), whereas commercial EVs need at least 3.5 kW charging facilities. This study aims to develop a 10 kW WPT for EV charging in Thailand. The experimental procedure firstly required the design of block ferrite EE55 cores. Secondly, the transmitter and receiver coils were constructed from homemade Litz wire. Thirdly, the prototype magnetic parameters were measured and simulated. A 10 kW high-frequency inverter was then built and tested. The 10 kW prototype IPT system was subsequently simulated, constructed, and characterized. The results revealed that when the prototype IPT system was applied to the resistive tungsten halogen load during the first stage of the research, at 369.4 V DC input voltage and 32.33 A DC input current, the DC output voltage, and currents were 362.4 V and 29.67 A, respectively, while the maximum DC output power and the dc-to-dc efficiency equated to 10.75 kW and 90.00%, respectively.
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