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Patent EP0508526A1 successfully refreshed from Google Patents.
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EP0508526A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Circuit arrangement

Assignee: Koninklijke Philips NV
•
Filing: 1992-03-31
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Granted: —
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Expires: 2012-03-31
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Abstract

Abstract The invention relates to a circuit arrangement for operating a high-pressure discharge lamp provided with a ballast circuit VI for generating a current through the high-pressure discharge lamp from a supply voltage, means I for controlling a power consumed by the high-pressure discharge lamp, means II for influencing a run-up behaviour of the high-pressure discharge lamp. According to the invention, the means II comprise means III for controlling the luminous flux of the high-pressure discharge lamp, and means IV for the automatic activation of the means I after the run-up of the high-pressure discharge lamp. It is achieved by this that the luminous flux of a high-pressure discharge lamp operated on the circuit arrangement has the same, substantially constant value during substantially the entire time duration of the run-up of the high-pressure discharge lamp and during stationary lamp operation.

Inventors

  • 👤 Meerten Luursema

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-09 22:40
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/14; H05B41/36; H05B41/38; H05B41/382; H05B41/388; H05B41/26; H05B41/28; H05B41/288; H05B41/2881; H05B41/2882; H05B41/39; H05B41/392; H05B41/3921; H05B41/3922; Y; Y02; Y02B; Y02B20/00; Y10; Y10S; Y10S315/00; Y10S315/07

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 95 words
A circuit arrangement for operating a high-pressure discharge lamp provided with - a ballast circuit VI for generating a current through the high-pressure discharge lamp from a supply voltage, - means I for controlling a power consumed by the high-pressure discharge lamp, - means II for influencing a run-up behaviour of the high-pressure discharge lamp, characterized in that the means II comprise - means III for controlling the luminous flux of the high-pressure discharge lamp, and - means IV for the automatic activation of the means I after the run-up of the high-pressure discharge lamp.
Claim 2
Dependent Claim 35 words
A circuit arrangement as claimed in Claim 1, characterized in that the means IV comprise a timer circuit for generating a signal after a fixed time interval after the ignition of the high-pressure discharge lamp.
Claim 3
Dependent Claim 65 words
A circuit arrangement as claimed in Claim 1 or 2, characterized in that the circuit arrangement is provided with calibration means for automatic calibration of the means III in relation to the means I, and in that the means III comprise a memory for storing a calibration signal which is a measure for the luminous flux of the high-pressure discharge lamp during stationary lamp operation.
Claim 4
Dependent Claim 25 words
A circuit arrangement as claimed in Claim 3, characterized in that the memory comprises a digital memory element, a digital/analog converter, and an analog/digital converter.

References Cited (Backward Citations)

WO1987001553A1 Cited
US4887122A Cited
EP0415496A2 Cited
EP0445757A2 Cited

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