Circuit arrangement for operation of discharge lamps, and method for operation of discharge lamps

US7994734B2 · kind B2 · utility

Assignee

• OSRAM Gesellschaft mit beschraenkter Haftung · DE

Inventors

• Christian Breuer · Newburyport, US
• Martin Brückel · Garching bei München, DE
• Andreas Huber · Holzgerlingen, DE
• Henning Rehn · Berlin, DE
• Bernhard Reiter · Munich, DE

Key dates

• Filing date: Dec 13, 2006
• Grant date: Aug 9, 2011
• Expiry date: Aug 14, 2027

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02B20/00
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

A circuit arrangement for operating a discharge lamp, wherein the circuit arrangement comprises a commutation device, which has an input which is coupled to a DC source, and has an output which can be coupled to a discharge lamp. The commutation device is designed in such a way that it couples the DC source to the output, and the polarity at which the DC source is coupled to the output can be commutated by a control device. The control device has a sync input, and the polarity of the DC source is commutated in synchronism with sync pulses of a sync signal which can be applied at the sync input. The control device has a measuring input, which is coupled to a measuring device which is designed to provide a measured value which is a measure of the size of electrode peaks. The control device suppresses at least one commutation if the measured value overshoots or undershoots a predetermined threshold value.