Patent Number: 8,796,941

Title: Method and circuit arrangement for operating at least one discharge lamp

Abstract: A method for operating a lamp, wherein in the preheating phase a first value of the voltage drop correlated with the reciprocal of the electrical resistance of a coil of the lamp is determined across a resistor at a first instant, and a second value of the voltage drop is determined at a second instant, may include: a) determining the difference between a first and the second value; b) b1) if the difference is greater than a first threshold value: carrying out an algorithm for lamp-type recognition; b2) if the difference is not greater than the first threshold value: c1) if the difference is greater than a second threshold value: d1) if the second value is greater than a third threshold value: determining a coil short circuit; d2) if the second value is not greater than the third threshold value: operating the lamp with the current set of operating parameters.

Inventors: Krummel; Peter (Traunreut, DE), Mitze; Andreas (Traunreut, DE)

Assignee: OSRAM Gesellschaft mit Beschraenkter Haftung

International Classification: H05B 37/02 (20060101)

Expiration Date: 8/05/12018