Design of an Automatic Transmitter Coil Positioning Adjustment System for Wireless Charging

This article presents the design of an automatic power transmission position adjustment system for small-sized cars and studies the efficiency of power transfer through the alignment of transmitting and receiving coil windings used in power transfer. The results show that the efficiency of electrical power transfer is highest when the transmitting and receiving coils are aligned at 92.65%, corresponding to the position (0,0). Thus, (0,0) serves as the reference point for designing the power transmission position adjustment system. The entire system is processed and controlled by a microcontroller. In the experiments, the car needs to park on the position adjustment set, maintaining a distance between the sensor and the rear bumper greater than or equal to 10 cm. Testing distances between the car's bumper and the ultrasonic sensor are set at 10, 15, 20, and 25 cm. The results obtained from the testing are compiled to assess positional misalignment.