리튬이온 배터리와 슈퍼커패시터를 이용한 전기 휠체어용 급속충전 장치 설계 = Design of Fast Charger for Electric Wheelchair using Lithium Ion Battery and Super capacitor

Design of Fast Charger for Electric Wheelchair using Lithium Ion Battery and Super capacitor 

Author Kim Do-Hyun 

Department of Electrical Engineering, Graduate School Pusan National University 

 Abstract 

Electric wheelchair uses a lithium ion battery and lead battery. It has a relatively long charging time of about 6 hours when charging slowly. In addition, in the case of a conventional electric charger for a wheelchair, the charging speed is 12 to 15 A, which is rapidly charged to about 2 hours at a relatively low current. This paper proposes a quick charging device for electric wheelchair using LLC resonant converter to solve the problem of long charging time. The LLC resonant converter operates in the ZVS region during rapid charging. The lithium-ion battery charges in the CC-CV mode, and the super capacitor charges in the CC mode. We propose an algorithm to compensate the transient state of CC-CV mode conversion of Li-ion battery. Instead of the lead battery used in the existing electric wheelchair, we compared the fast charge time trend of the super capacitor and the lithium ion battery according to the charging current. The charging time of the proposed rapid charging device has a charging time of less than one hour. In addition, it was confirmed that the lithium ion battery and the super capacitor can be used together or the charge time can be pulled when the super capacitor is used alone.

ORIGINAL LINK:http://www.riss.kr/search/detail/DetailView.do?p_mat_type=be54d9b8bc7cdb09&control_no=1895c1fb2e6a2dedffe0bdc3ef48d419

LINK ALTERNATIVO: http://www.mediafire.com/file/4xw9e1dniwge309/Design_of_Fast_Charger_for_Electric_Wheelchair_using_Lithium_Ion_Battery_and_Super_capacitor.pdf/file