Design of a contactless battery charger for cellular phone
Chang-Gyun Kim
Dong-Hyun Seo
Jung-Sik You
Jong-Hu Park
Cho, B.H.
Sch. of Electr. Eng., Seoul Nat. Univ.;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: Dec 2001
Volume: 48,
Issue: 6
On page(s): 1238-1247
ISSN: 0278-0046
References Cited: 18
CODEN: ITIED6
INSPEC Accession Number: 7122732
Digital Object Identifier: 10.1109/41.969404
Current Version Published: 2002-08-07
Abstract
In this paper, the design of a contactless charger for the
lithium-ion battery of a cellular phone is presented. In this charger,
the primary core of the transformer is in the charger unit and the
secondary core is in the telephone. The gap (3 mm) between them is the
thickness of the two plastic cases. The transformer core design for the
maximum coupling coefficient with the size constraint on the secondary
side is presented. Analysis of the primary-side series resonant power
converter with the loosely coupled transformer is performed, and the
design optimization is presented. For the battery-charging control, a
simple control circuit is presented and its performance is verified from
the experimental results
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