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US 2003/0227264 A1Published application
Discharge lamp operating circuit having a circuit for detecting the proximity to capacitive operation
AssigneePatent-Treuhand-Gesellschaft Fur Elektrisch Gluhlampen Mbh
InventorsOlaf Busse, Markus Heckmann
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Abstract
The invention relates to an operating circuit for a discharge lamp, having a detection circuit for identifying the proximity to capacitive operation, which uses lamp current fluctuations for detection purposes.
Claims11
An operating circuit for a discharge lamp, having
- an oscillator circuit for generating radio-frequency supply power for a load circuit containing the discharge lamp from a variable supply power
- and a detection circuit for identifying the proximity to capacitive operation of the load circuit,
- characterized in that the detection circuit detects the magnitude of fluctuations, corresponding to the changes in the supply power, in the lamp current.
An operating circuit for a discharge lamp, having
- an oscillator circuit for generating radio-frequency supply power for a load circuit containing the discharge lamp from a variable supply power,
- a detection circuit for identifying the proximity to capacitive operation of the load circuit,
- and a lamp control circuit for controlling the load circuit to a desired lamp value (Ilamp-des),
- characterized in that the detection circuit detects the magnitude of fluctuations, corresponding to the changes in the supply power, in a manipulated variable of the lamp control circuit.
1 more element
Dependencies are inferred from the claim text.