Title :
Design of a contactless battery charger for cellular phone
Author :
Kim, Chang-Gyun ; Seo, Dong-Hyun ; You, Jung-Sik ; Park, Jong-Hu ; Cho, Bo-Hyung
Author_Institution :
Sch. of Electr. Eng., Seoul Nat. Univ., South Korea
fDate :
6/22/1905 12:00:00 AM
Abstract :
In this paper, the design of a contactless charger for a 3.3 W 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 and the maximum magnetizing inductance with the size constraint on the secondary side is presented. A half-bridge series resonant converter is used to compensate the leakage inductance and to achieve ZVS operation. Voltage gain, current gain analysis, and design procedure are presented. For the battery charging control, an infrared LED is used and its performance is verified from the hardware experiments
Keywords :
battery chargers; cellular radio; compensation; inductance; literature; lithium; magnetic leakage; resonant power convertors; secondary cells; transformer cores; 3 mm; 3.3 W; Li; battery charging control; cellular phone; charger unit; contactless battery charger; current gain analysis; half-bridge series resonant converter; infrared LED; leakage inductance compensation; lithium-ion battery; maximum coupling coefficient; maximum magnetizing inductance; primary core; secondary core; size constraint; telephone; transformer core design; voltage gain; Batteries; Cellular phones; Couplings; Inductance; Magnetic cores; Magnetic resonance; Plastics; Telephony; Transformer cores; Zero voltage switching;
Conference_Titel :
Applied Power Electronics Conference and Exposition, 2000. APEC 2000. Fifteenth Annual IEEE
Conference_Location :
New Orleans, LA
Print_ISBN :
0-7803-5864-3
DOI :
10.1109/APEC.2000.822591
