Short Range Wireless Power Charging on Small Electric Vehicles

This paper presents the research work focusing on charging the energy via the air to a small electric vehicle (EV). This work shows not only the possibility of wireless power charging, but also the electromagnetic compatibility (EMC) issue is taken into account. The charging system is described and set up using the resonance coupling effect and single-ended primaryinductor converter (SEPIC) for a low DC power charging. The transmitting power is applied at a frequency of 6.78 MHz across a gap in the short range between 100 mm to 200 mm. The experimental results show that the maximum efficiency up to 80 % were achieved to charge to a three wheel electric scooter 36 V system up to 14 W. The wireless charging has been studied on radiated emission during charging mode at transmitter, receivers and at the gap between transmitter and receiver.