Wireless Power Transfer System for Electric Vehicle Charging

Abstract

The design and development of a Wireless Power Transfer (WPT) system that does not require wires or plugs for Electric Vehicle (EV) charging is presented in this study. The proposed system utilizes magnetic resonance coupling technology to transfer power between a transmitter coil embedded in the ground and a receiver coil integrated into the EV. The system operates at a frequency of 85 kHz and can deliver up to 3.7 kW of power with an efficiency of 90%. The WPT system consists of a transmitter unit, a receiver unit, and a control unit. The transmitter unit comprises a high-frequency inverter, a transmitter coil, and a compensation network. The receiver unit consists of a receiver coil, a rectifier, and a DC-DC converter. The control unit ensures efficient power transfer and safety features. Experimental results demonstrate the system's feasibility and efficiency, paving the way for convenient and automated EV charging. The proposed WPT system offers a promising solution for future EV charging infrastructure, enhancing user experience and promoting widespread adoption of eco-friendly transportation. This technology eliminates the need for physical connections, reducing wear and tear on components and improving user convenience. The core of WPT systems involves resonant inductive coupling, where an alternating current generates a magnetic field in a primary coil, which then induces a current in a secondary coil located in the EV.