Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Silicon controlled rectifier ignition
Patent
1997-08-21
1999-03-09
Wong, Don
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Silicon controlled rectifier ignition
315246, 315287, H05B 3702
Patent
active
058805613
ABSTRACT:
An apparatus for operating a high intensity discharge lamp that minimizes discharge arc curvature to form a straight discharge arc and thereby eliminate variations in the discharge arc color caused by cataphoresis is disclosed. The apparatus outputs a synthesize wave having a waveform with a frequency component of the acoustic resonance frequency to excite a mode straightening the discharge arc, and a waveform of a frequency less than the acoustic resonance frequency whereby the polarity of the waveform having a frequency less than the acoustic resonance frequency changes. The acoustic resonance frequency is determined by the speed of sound in the discharge space, and the length of the discharge space intersecting the discharge arc.
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.
Horii Shigeru
Kominami Satoshi
Miyazaki Kouji
Matsushita Electric - Industrial Co., Ltd.
Vu David H.
Wong Don
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