无线电能传输系统恒流 / 恒压输出切换方法

Wireless power transfer (WPT) systems are commonly used for wireless battery charging. To fulfill the requirements of battery charging, this paper proposes a WPT system that can switch between constant current (CC) and constant voltage (CV) modes. The optimized LCC / S compensation topology was employed, and only one switch was added to switch from CC to CV mode. The proposed switching method shows the advantages of continuous switching process, low voltage stress across the switch, and zero voltage switching in the full load range. The output characteristics of CC and CV compensation topologies were analyzed, and an electrical parameter design method was proposed for the loosely coupled transformer considering both component voltage stress and system loss. An experiment platform whose output power ranges from 18 to 180 W was built to verify the theoretical analysis. The outer dimensions of the employed loosely coupled transformer is 210 伊 210 伊 10 mm³ . The constant output voltage and current were designed to be 60 V and 3 A, respectively. The working frequency is 85 kHz, and the transmission distance is 70 mm. The maximum system efficiencies in CV and CC modes are 93. 4% and 90. 5%, respectively.