Design and Optimization of an Integrated Coil Wireless Charging System Based on a Switchable Hybrid Structure

To simplify the complexity of the control strategy during the switching process from the constant current (CC) mode to the constant voltage (CV) mode of the wireless charging system, an integrated coil wireless charging system based on a switchable hybrid structure is proposed. Through switching the compensation element at the receiving pad, CC and CV switching can be achieved under the condition of zero phase angle (ZPA) input. Meanwhile, through the optimized design of the integrated coil and reasonable parameter configuration, the system can still maintain good CC–CV output characteristics when the misalignment happens. The experimental results show that the maximum fluctuation of charging current and voltage is less than 9%, and the charging efficiency can be maintained at a high level within 100 mm misalignment in the
$X$
-axis.