Patent ID: 7839093

Claim:
A circuit arrangement for operating a high-pressure gas discharge lamp (Lp), the circuit arrangement exhibiting the following features: a full-bridge inverter (S 1 , S 2 , S 3 , S 4 ) comprising two half-bridge branches and an intermediate bridge branch, wherein a half-bridge voltage (UA, UB) can be fed into the bridge branch through each half-bridge branch; a supply voltage (US) wherein the supply voltage feeds the full-bridge inverter (S 1 , S 2 , S 3 , S 4 ); the half-bridge voltages (UA, UB) exhibit a phase (φ) with respect to one another which can be set by a controller, the high-pressure gas discharge lamp (Lp) can be coupled to the bridge branch, the full-bridge inverter (S 1 , S 2 , S 3 , S 4 ) supplies to the high-pressure gas discharge lamp (Lp) a lamp current (IL) which is essentially an alternating current with a modulated operating frequency which continuously oscillates within a range between a minimum frequency and a maximum frequency, the circuit arrangement being characterized in that the controller sets the phase (φ) in dependence on the operating frequency in such a manner that the phase (φ) increases with increasing operating frequency.