Method and system of driving a CCFL

Details Method and system of driving a CCFL Method and system of driving a CCFL

2005-09-06

2005-09-06

Vu, David (Department: 2828)

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Transformer in the supply circuit

C315S277000, C315S278000

Reexamination Certificate

active

06940233

ABSTRACT:
To efficiently and cost-effectively produce a light source, a CCFL circuit can include a PMOS transistor, first and second NMOS transistors, and a high turns ratio transformer. The transformer can include a primary coil having a center tap, thereby forming first and second primary windings, as well as a secondary coil. The PMOS transistor can be connected to the center tap for driving the transformer. The first and second NMOS transistors can be connected to the first and second primary windings, respectively. Of importance, the first primary winding is tightly coupled to the second primary winding, whereas the first and second primary windings are loosely coupled to the secondary coil.

REFERENCES:
patent: 4378515 (1983-03-01), Nakai et al.
patent: 5615093 (1997-03-01), Nalbant
patent: 5619402 (1997-04-01), Liu
patent: 5652479 (1997-07-01), LoCascio et al.
patent: 5754012 (1998-05-01), LoCascio et al.
patent: 5844378 (1998-12-01), LoCascio et al.
patent: 5923129 (1999-07-01), Henry
patent: 5930121 (1999-07-01), Henry
patent: 6094015 (2000-07-01), Wessels et al.
patent: 6114814 (2000-09-01), Shannon et al.
patent: 6316881 (2001-11-01), Shannon et al.

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