Discharge lamp circuit for ignition time control and...

Details Discharge lamp circuit for ignition time control and... Discharge lamp circuit for ignition time control and...

2005-02-01

2005-02-01

Tran, Thuy Vinh (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

C315S308000, C315S360000, C315SDIG007

Reexamination Certificate

active

06850014

ABSTRACT:
A discharge lamp circuit for ignition time control and overvoltage protection. The discharge lamp circuit includes drive circuitry, a sensing circuit, a timing circuit and a start-up circuit. The drive circuitry produces a strike voltage for a discharge lamp and provides a lamp current through the discharge lamp. The sensing circuit is provided to detect the lamp current. During lamp start-up, the timing circuit will develop a threshold voltage at the end of a predetermined period if the discharge lamp has not been lit yet, thereby controlling an ignition time of the drive circuitry. The start-up circuit allows the drive circuitry to keep on applying the strike voltage for the ignition time in order to start the discharge lamp before the threshold voltage is developed. Once the sensing circuit detects the absence of the lamp current, the start-up circuit also causes the drive circuitry shutdown.

REFERENCES:
patent: 4665346 (1987-05-01), Tarroux
patent: 4914356 (1990-04-01), Cockram
patent: 5068570 (1991-11-01), Oda et al.
patent: 5070279 (1991-12-01), Garbowicz et al.
patent: 5781418 (1998-07-01), Chang et al.
patent: 6008590 (1999-12-01), Giannopoulos et al.
patent: 6160362 (2000-12-01), Shone et al.
patent: 6194842 (2001-02-01), Canova

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