Direct drive CCFL circuit with controlled start-up mode

Details Direct drive CCFL circuit with controlled start-up mode Direct drive CCFL circuit with controlled start-up mode

2006-04-18

2006-04-18

Dinh, Trinh Vo (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

C315S2090SC, C315S291000

Reexamination Certificate

active

07030569

ABSTRACT:
A CCFL can exhibit different strike characteristics depending on age and temperature. A CCFL in a direct driven CCFL circuit that is difficult to strike can appear to be malfunctioning using a standard start up operation. A controlled start up allows additional opportunities for a slow striking CCFL to strike. In one embodiment, the CCFL of the direct drive CCFL circuit can be initially driven at a switching frequency substantially different than a resonant frequency. Based on certain conditions, the switching frequency can subsequently be allowed to approach resonant frequency in a controlled manner. If the driving frequency reaches the resonant frequency of the CCFL during a set time period, then the CCFL can enter into steady state operation. At this point, the same conditions can be monitored to identify fault conditions in the direct drive CCFL circuit.

REFERENCES:
patent: 5619402 (1997-04-01), Liu
patent: 5680017 (1997-10-01), Veldman et al.
patent: 6011360 (2000-01-01), Gradzki et al.
patent: 6104146 (2000-08-01), Chou et al.
patent: 6259615 (2001-07-01), Lin
patent: 6396722 (2002-05-01), Lin
patent: 6804129 (2004-10-01), Lin
Henry: “LX1686 Direct Drive CCFL Inverter Design Reference”, Microsemi Application Note AN-13, Microsemi Linfinity Division, Copyright 2000, Rev. 1.5.9.01, pp. 1-27.

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