PROTECTION CIRCUIT FOR ARC DISCHARGE LAMPS

A ballast includes an inverter for providing an AC voltage to a discharge lamp. As the lamp approaches end-of-life a DC voltage component develops across the lamp. The ballast includes circuitry for monitoring the condition of each of the cathodes by measuring this DC voltage component. After a pred...

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Bibliographische Detailangaben
Hauptverfasser:	ROCHE, WILLIAM J, LESTER, JAMES N
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	ELECTRIC HEATING ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR ELECTRICITY
Online-Zugang:	Volltext bestellen
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Beschreibung
Zusammenfassung:	A ballast includes an inverter for providing an AC voltage to a discharge lamp. As the lamp approaches end-of-life a DC voltage component develops across the lamp. The ballast includes circuitry for monitoring the condition of each of the cathodes by measuring this DC voltage component. After a predetermined increase in this DC voltage component, the inverter is disabled in order to prevent excessive heating of the cathodes.