Circuit arrangement and method for operating a high-pressure discharge lamp

US8120269B2 · kind B2 · utility

Assignee

• OSRAM GmbH · DE

Inventors

• Martin Honsberg-Riedl · Teisendorf, DE
• Andreas Huber · Holzgerlingen, DE
• Simon Lankes · Falkensee, DE
• Burkhard Ulrich · Rosenfeld, DE

Key dates

• Filing date: Dec 18, 2006
• Grant date: Feb 21, 2012
• Expiry date: Feb 16, 2028

Classification

• Technology area (CPC H): Electricity
• CPC primary: H05B41/288
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

A circuit arrangement for operating a high-pressure discharge lamp (12) with an electronic ballast, which is designed to provide an AC feed signal for the high-pressure discharge lamp (12). The AC feed signal comprises, in the time range as modulation period (T), a serial sequence of at least one first signal section (Sa1), one second signal section (Sa2) and one third signal section (Sa3), which are associated with a first, a second and a third color. The AC feed signal is an amplitude-modulated RF signal (IRF) with a frequency (f) of at least 500 kHz. The following applies for the envelope (E) of the signal components with a positive and/or negative amplitude: the absolute value of the envelope (E) has a mean amplitude (M); and the first signal section (Sa1) and/or the second signal section (Sa2) and/or the third signal section (Sa3) has/have at least one temporal range in which the absolute value of the envelope (E) is between 5% and 100% greater than the mean amplitude and/or in which the absolute value of the envelope (E) is between 5% and 90% less than the mean amplitude (M).