WIRELESS CHARGING ELECTRICALVEHICLES BY OPTIMAL INDUCTIVECOUPLE TRANSFORMER

Abstract

The paper discusses the growing popularity of wireless charging for electric vehicles (EVs) and
highlights the potential risk of device damage due to sharp variations in inverter output current and Zero
Voltage Switching (ZVS) angle, particularly during charging sessions where there is alignment variation
between resonant coils. To address this concern, the authors propose a protection strategy composed of
insufficient angle protection, overcurrent protection, and excessive angle protection. The protection
strategy is based on analyzing the characteristics of the inverter output current and phase angle when
the wireless charging EV disconnects. A detection circuit is designed to monitor these variations in realtime. The proposed method is then validated through experimentation using a wireless charging EV
prototype. The experimental results confirm that the designed detection circuit and protection strategy
effectively identify abnormal working states of the system when the wireless charging EV disconnects,
enabling immediate measures to be taken to safeguard the main circuit from potential device damages.
This research contributes to enhancing the safety and reliability of wireless charging systems for electric
vehicles.