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
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