System design of electric assisted bicycle using EDLCs and wireless charger

This paper discusses an electric assisted bicycle which uses electric double layer capacitors (EDLCs) as a power source. EDLCs are charged through a rapid charger by using wireless power transmission. In this paper, first, the energy capacity of EDLCs is designed. Next, the antenna for the wireless power transmission and the charger are investigated. Third, this paper compares the volume and the power loss of the three kinds of DC-DC converters which are step-down type, boost-type and buck-boost type for the charging and discharging of EDLCs. As a result, boost-type is the most compact in the power capacity of the electric assisted bicycle. Finally, the proposed system is experimentally verified as a prototype. As a result, the proposed system can shorten to 1/4 the charging time of the conventional system.