Analysis and Design of Cost-Effective WPT Systems With Dual Independently Regulatable Outputs for Automatic Guided Vehicles

Recently, wireless power transfer (WPT) charging systems have been attracting extensive attention for overcoming the drawbacks of the traditional plugging charging systems, making it a promising candidate for automatic guided vehicles (AGVs). As far as AGVs' applications are concerned, it is quite essential to lower the cost and save space. In order to supply power to both the driving system and control system simultaneously, a dual independently regulatable outputs WPT system without dc-dc converters is presented. Only two diodes and two MOSFETs are employed for the rectifier circuit on the secondary side. A 500-W prototype is built to verify the feasibility of the proposed system. Experimental results show that when a load varies and its output current is regulated with open-loop control, the maximum output current fluctuation of the other load is only ±0.688%, and the verified dual outputs are independently regulatable. With closed-loop control, the output voltages can be regulated to the desired ones and remain constant when the loads alter or misalignments happen. The overall efficiency ranges from 86.22% to 90.93%.