Cold cathode tube drive device

Details Cold cathode tube drive device Cold cathode tube drive device

2005-08-08

2010-02-02

Vo, Tuyet (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

C315S274000, C315S291000, C315S224000, C315S312000

Reexamination Certificate

active

07656101

ABSTRACT:
A cold-cathode tube drive device includes an inverter circuit (1) for generating a high-frequency voltage, a booster transformer (2) for boosting the high-frequency voltage generated by the inverter circuit (1), a cold-cathode tube (3) which is turned on by the high-frequency voltage after boosted by the booster transformer (2), a series circuit (6) having a reactance element (4) connected in parallel to the cold-cathode tube (3), a synthesis circuit (8) for combining the connected current value i2of the series circuit (6) with the secondary side current value i1of the booster transformer (2) so as to indirectly detect the lamp current value iL of the cold-cathode tube (3), and a control circuit (9) for controlling the inverter circuit (1) according to the lamp current value iL indirectly detected by the synthesis circuit (8) and controlling the lamp current of the cold-cathode tube (3).

REFERENCES:
patent: 5952791 (1999-09-01), Watanabe et al.
patent: 6420839 (2002-07-01), Chiang et al.
patent: 2002/0097004 (2002-07-01), Chiang et al.
patent: 2007/0108921 (2007-05-01), Matsushima
patent: 61-154486 (1986-07-01), None
patent: 9-129382 (1997-05-01), None
patent: 2002-231474 (2002-08-01), None
patent: 3096242 (2003-09-01), None
patent: 2004-213994 (2004-07-01), None

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