Patent ID: 7884654

Claim:
A circuit arrangement for driving an electrical load, comprising: an input for feeding a power-supply voltage with an AC component; an output for providing an output signal for driving a connectable electrical load; a frequency processing circuit for preparing a reference frequency as a function of the AC component; a demodulator, comprising; a first input, which is coupled to an output of the frequency processing circuit for supplying the reference frequency; a second input, which is coupled to the input of the circuit arrangement; an output, which is coupled to the output of the circuit arrangement; a multiplier; and a filter, wherein the multiplier is coupled on the input side to the first and second inputs of the demodulator, and on the output side, to the output of the demodulator via the filter, wherein the frequency processing circuit comprises a phase-locked loop with an input, which is coupled to the input of the circuit arrangement, and an output, which is coupled to the first input of the demodulator and at which the reference frequency can be tapped.