Patent ID: 8810148

Claim:
A surge-proof illumination system DALI interface circuit ( 100 ) comprising: a rectifier circuit ( 20 ) which is designed for providing, in dependence on a rectifier input voltage present at rectifier input terminals ( 20 a , 20 b ), a rectified rectifier output voltage at rectifier output terminals ( 20 c , 20 d ), and a Darlington circuit ( 30 ) having at least two transistors (Q 3 , Q 4 ), wherein the Darlington circuit has a current path ( 35 ) on the output side, controllable in dependence on a drive signal ( 62 ), wherein the controllable current path ( 35 ) on the output side is coupled between the rectifier output terminals ( 20 c , 20 d ), and wherein the controllable current path ( 35 ) on the output side is designed for forming between the rectifier output terminals ( 20 c , 20 d ) a load variable in dependence on a drive signal ( 62 ).