Discharge lamp driving circuit having a signal detection...

Details Discharge lamp driving circuit having a signal detection... Discharge lamp driving circuit having a signal detection...

2008-06-17

2008-06-17

Vu, David H (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Periodic switch in the primary circuit of the supply...

C315S224000, C315S307000, C315S308000, C315SDIG002

Reexamination Certificate

active

07388336

ABSTRACT:
A discharge lamp driving circuit includes an inverter, a ballast capacitor, a discharge lamp, and a lamp current detecting circuit. The inverter converts a DC voltage into an AC voltage with high frequency to output the AC voltage to an output port based on a pulse width modulation control signal. The lamp current detecting circuit outputs a first voltage signal and a second voltage signal according to a voltage across the ballast capacitor to generate a lamp current sensing voltage that is proportional to a lamp current flowing through the discharge lamp. The pulse width modulation control signal has a width varying with amplitude of the lamp current so that the lamp current may be accurately detected.

REFERENCES:
patent: 6163115 (2000-12-01), Ishizuka
patent: 7187137 (2007-03-01), Yadlapalli
patent: 7221107 (2007-05-01), Melis
patent: 2003/0160573 (2003-08-01), Johnson
patent: 2004/0113567 (2004-06-01), Yamauchi et al.
patent: 2004/0189216 (2004-09-01), Choi
patent: 2004-119206 (2004-04-01), None
patent: 1020030087308 (2003-11-01), None
patent: 1020040018658 (2004-03-01), None

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