Diagnostic circuit and method for predicting fluorescent lamp fa

Details Diagnostic circuit and method for predicting fluorescent lamp fa Diagnostic circuit and method for predicting fluorescent lamp fa

1996-12-06

1999-09-14

Ballato, Josie

Electricity: measuring and testing

Electric lamp or discharge device

Electric lamp

324403, 315107, G01R 3100

Patent

active

059528320

ABSTRACT:
A diagnostic circuit monitors filament currents in hot cathode fluorescent lamps for detecting when the filament erodes to the point of breaking. When such a filament failure is detected, information is processed and a request is sent to replace the lamp before it actually fails. The diagnostic circuit is low power and low voltage and is electrically isolated from the high-voltage end of the lamp. Additionally, a simple circuit to regulate rms value of filament voltage without having to compute or otherwise measure the actual rms value is provided.

REFERENCES:
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patent: 5315214 (1994-05-01), Lesea
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patent: 5578998 (1996-11-01), Kasprowicz
patent: 5623184 (1997-04-01), Rector
patent: 5650694 (1997-07-01), Jayaraman
patent: 5703441 (1997-12-01), Steigerwald et al.
S.N. 08/551,968, filed Nov. 2, 1995 (RD-24,583).

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