Method and apparatus for operating a discharge lamp to reduce th

Details Method and apparatus for operating a discharge lamp to reduce th Method and apparatus for operating a discharge lamp to reduce th

1998-09-24

2000-10-10

Vu, David

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

315246, 315287, H05B 3702

Patent

active

061305081

ABSTRACT:
A discharge lamp operating apparatus has a glass envelope for defining a discharge space and a pair of electrodes which are hermetically sealed within the glass envelope and are opposed to each other. The apparatus includes (1) generation element for generating a waveform signal having an acoustic resonant frequency for exciting a mode, in which a discharge arc between the pair of electrodes is straightened and (2) modulation element for modulating the waveform signal so that a polarity of the center line of the waveform signal is alternately changed at a lower frequency than the acoustic resonant frequency. If the value of the amplitude of the waveform signal from peak to peak is .alpha., and the effective value of the modulated waveform signal is .beta., then the depth of modulation .alpha./.beta. at the beginning of operation is equal to or less than the depth of modulation .alpha./.beta. at an operation under rated condition.

REFERENCES:
patent: 4983889 (1991-01-01), Roberts
patent: 5121034 (1992-06-01), Allen et al.
patent: 5198727 (1993-03-01), Allen et al.
patent: 5270620 (1993-12-01), Basch et al.
patent: 5436533 (1995-07-01), Fromm et al.
patent: 5773937 (1998-06-01), Miyazaki et al.
U.S. application, No. 08/915,641, filed Aug. 21, 1997, by Miyazaki et al.

Affiliated with

Also associated with

Rating

Method and apparatus for operating a discharge lamp to reduce th does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and apparatus for operating a discharge lamp to reduce th, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for operating a discharge lamp to reduce th will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2259413