Patent ID: 8207681

Claim:
A circuit arrangement for the closed-loop control of the current through at least one discharge lamp, the circuit arrangement comprising: a control loop comprising: a setpoint value input configured to supply a setpoint value; an actual value input configured to supply an actual value; and an output configured to provide a signal, which has been correlated with the current through the at least one discharge lamp, the actual value having been correlated with the value of the current through the discharge lamp; and a setpoint value input apparatus, which is designed to provide the setpoint value to the control loop; wherein the setpoint value input apparatus comprises: a microprocessor with at least one input, the microprocessor being designed to couple the at least one input to a potential from a group of at least two different potentials; and a wiring apparatus with at least one input, which is coupled to the at least one input of the microprocessor, and at least one output, which is coupled to at least one point of the control loop.