Published Paper Details:

Wireless charging has become increasingly popular for electric vehicles (EVs) in recent years. However, possible device damage may happen because of the sharp variations of inverter output current and the ZVS angle due to the alignment variation between resonant coils especially while charging. To design a protection strategy, the characters of the inverter output current and phase angle are analyzed when the wireless charging EV leaves. The protection strategy is composed of the insufficient angle protection, overcurrent protection, and the excessive angle protection. A detection circuit is designed to measure the variation of inverter output current and phase angle. A wireless charging EV prototype is established to validate the proposed methods. The experimental results show that the designed detection circuit and protection strategy can catch the abnormal working state of the system when the wireless charged EV leaves and take measures immediately to protect the main circuit of the system from device damages. Wireless power Transfer (WPT) is nowadays visible to us in many different areas of technology and in many different forms and types. The technological areas vary from the crucial biomedical technology to commercial products such as wireless electric vehicle, wireless charging units and many more. Wireless transmission is useful in cases where instantaneous or continuous energy transfer is needed but interconnecting wires are inconvenient, hazardous, or impossible. The wireless energy transfer gets unique in its area of technology because of its efficiency which is the most important parameter under consideration. This makes the wireless energy transfer different from other information transfer methods. Wireless power systems for near field energy transfer, are typically classified as either inductive or resonant. The wireless power transfer surpassing efficiency is the optimum technique to transfer the power wirelessly and power up the low power devices such as Mobile phones, small fans, and any microcontroller unit