Electronic ballast for a high intensity discharge lamp with auto

Details Electronic ballast for a high intensity discharge lamp with auto Electronic ballast for a high intensity discharge lamp with auto

1997-09-16

1999-08-24

Philogene, Haissa

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315308, 315224, 315DIG7, G05F 100

Patent

active

059428600

ABSTRACT:
A ballast for a high intensity discharge lamp which detects the onset of acoustic resonance instability by detecting an asymmetry in a signal which is otherwise symmetric in the absence of such instability. The AC supply ripple voltage, which is normally present in the lamp current, exhibits symmetry in the absence of acoustic resonance, and becomes substantially asymmetric at the onset of acoustic resonance. By measuring the duration of each half cycle in the ripple voltage, an asymmetry in the ripple voltage can be easily and rapidly detected, and the operating frequency of the lamp current is changed before the resonance produces visually apparent flicker.

REFERENCES:
patent: 3890537 (1975-06-01), Park et al.
patent: 4373146 (1983-02-01), Bonazoli et al.
patent: 5225742 (1993-07-01), Beasley
patent: 5235255 (1993-08-01), Blom
patent: 5569984 (1996-10-01), Holtslag
patent: 5623187 (1997-04-01), Caldeira et al.
patent: 5680015 (1997-10-01), Bernitz et al.
patent: 5859505 (1999-01-01), Bergman et al.

Affiliated with

Also associated with

Rating

Electronic ballast for a high intensity discharge lamp with auto does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Electronic ballast for a high intensity discharge lamp with auto, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electronic ballast for a high intensity discharge lamp with auto will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-469685