Directional power transfer and data communication using magnetic resonance wireless charging system

Abstract

This research proposes bidirectional power and data transfer which implements electric vehicle (EV) battery charge/discharging using magnetic resonance coupling wireless power transfer (MRC‐WPT) with inner communication by binary phase‐shift keying (BPSK) technology between the primary side and the secondary side. The MRC‐WPT‐BPSK can implement grid‐to‐vehicle, vehicle‐to‐grid, or vehicle‐to‐load (V2L) functions due to inner communication capability without additional wireless communication modules such as Wi‐Fi, Bluetooth, ZigBee, and so on. In the experiment result, charging power up to 300 W can reach an efficiency of 85%. The data communication accuracy (quality) of this system can be almost 100% within the air gap from 0 to 50 mm. In addition, the V2L function can provide energy up to 1000 Wh, such as emergency power, backup power, or light sources in the parking lot. Therefore, MRC‐WPT‐BPSK like a smart grid aids the user to obtain benefits from charging or discharging the battery according to time‐of‐use list.