Patent ID: 8120269
Filing Date: 2012-02-21
Classification: H04N,H05B

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