Electric lamp and discharge devices: systems – Pulsating or a.c. supply – Transformer in the supply circuit
Reexamination Certificate
2006-02-21
2006-02-21
Vo, Tuyet Thi (Department: 2821)
Electric lamp and discharge devices: systems
Pulsating or a.c. supply
Transformer in the supply circuit
C315S279000, C315S291000, C315S312000, C363S021020, C363S021010, C323S344000, C323S328000
Reexamination Certificate
active
07002304
ABSTRACT:
A multi-lamp drive device comprises a transformer, a drive circuit and at least a balanced inductor. The magnetic core of the transformer has a first side column, a second side column and at least a central column. A primary coil and a secondary coil are wound around the first side column and the second side column, respectively. The drive circuit can output an excitation power source to the transformer for driving lamps to be on based on the energy conversion characteristic of the transformer. With the help of the central column, the transformer can guide the counter magnetic flux generated by the load current without interfering the power conversion action of the transformer. Moreover, heat generated by the transformer due to a too larger load current can be reduced, and the protection function for the transformer during short circuit can also be accomplished.
REFERENCES:
patent: 4187450 (1980-02-01), Chen
patent: 4858093 (1989-08-01), Sturgeon
patent: 4864478 (1989-09-01), Bloom
patent: 5036255 (1991-07-01), McKnight et al.
patent: 6717372 (2004-04-01), Lin et al.
patent: 2005/0023998 (2005-02-01), Lee
Chan Chun-Kong
Wang Jeng-Shong
Lien Chang Electronic Enterprise Co., Ltd.
Vo Tuyet Thi
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