Circuit arrangement and method for striking a discharge lamp

US8093836B2 · kind B2 · utility

Assignee

• OSRAM GmbH · DE

Inventors

• Olaf Busse · Munich, DE
• Siegfried Mayer · Leinfelden, DE
• Arwed Storm · Dachau, DE

Key dates

• Filing date: Sep 25, 2006
• Grant date: Jan 10, 2012
• Expiry date: Jan 19, 2028

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 striking a discharge lamp, comprising: a drive apparatus, having an output adapted to provide a drive signal with a predeterminable frequency; an inverter, which is coupled to the output of the drive apparatus, and having an output adapted to provide a square-wave signal with a predeterminable duty factor; a load circuit, which is coupled to the output of the inverter and has at least one terminal for the discharge lamp, the load circuit comprising a lamp inductor, which is coupled in series between the output of the inverter and the at least one terminal for the discharge lamp; a first control loop with a first reference variable, a first manipulated variable and a first controlled variable, the first control loop having a first time constant; a second control loop with a second reference variable, an auxiliary manipulated variable and a second controlled variable, the second control loop having a second time constant; and a strike detection apparatus, which is adapted to detect striking of the discharge lamp and, after detection of the striking to switch over the first and the second control loops from the striking operation mode to the continuous operat…