Patent ID: 7911159

Claim:
Circuit arrangement for operating a high intensity discharge lamp, said circuit arrangement comprising regulable converter means adapted to generate a current regulable in magnitude out of a supply voltage, commutator means for commutating the current and comprising lamp connection terminals, setpoint signal generator means adapted to generate a principal setpoint signal for said current, correctional setpoint signal generator means adapted to generate a correctional setpoint signal adjusting said principal setpoint signal to form a corrected setpoint signal, said correctional setpoint signal generator means comprising memory means, output means for said correctional setpoint signal, input means adapted to acquire an input signal, and calculation means adapted to periodically recalculate said correctional setpoint signal based on said input signal and a signal stored in said memory means, and said circuit arrangement furthermore comprising phase synchronization means adapted to synchronize said correctional setpoint signal generator to said principal setpoint signal.