| 摘要 |
The invention relates to a circuit arrangement for detecting a crest factor of a lamp current or a lamp operating voltage of an electric lamp ( 2 ), the circuit arrangement having a first subcircuit ( 15 ), which is designed to determine an averaged value from an input signal applied to the circuit arrangement, having a second subcircuit ( 16 ), which is designed to determine a maximum permissible value from the input signal applied to the circuit arrangement and having a comparator circuit ( 17 ), which is designed to produce a comparison signal from the output signal of the first subcircuit ( 15 ) characterizing the averaged value and from an output signal of the second subcircuit ( 16 ) characterizing the maximum permissible crest factor. The invention also relates to a method for detecting such a crest factor. One further aspect of the invention relates to an electronic ballast ( 1 ) which has a circuit arrangement ( 14 a, 14 b) according to the invention. Furthermore, the invention also relates to a method for operating an electric lamp, in which a crest factor is detected in accordance with a method according to the invention.
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