Patent ID: 8339057

Claim:
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, the frequency of the AC feed signal being at least 1 MHz, the electronic ballast comprising: an input terminal for connecting an input voltage; an output terminal for providing the AC feed signal to the high-pressure discharge lamp; and a series circuit comprising an inverter and a load network, which series circuit is arranged between the input terminal and the output terminal, the inverter providing an inverter output voltage with a predeterminable frequency, a predeterminable amplitude and a predeterminable duty factor to the load network, wherein the electronic ballast is adapted to modulate the amplitude of the AC feed signal, wherein the load network has at least one transformer, which is arranged at the input and/or at the output and/or between the input and the output of the load network.