Patent Treuhand Gesellschaft Fur Elektrische Gluhlampen Mbh

Martin Grabner

Markus Heckmann

Olaf Busse

Richard Koeppl

Rene Twardzik

Cristian Bahr

Jerzy Cierpinski

Bernhard Orben

Thomas Eckhard

The invention relates to a novel operating circuit for a low-pressure discharge lamp with early EOL detection via a measurement of the DC voltage between the electrodes . In this case, the DC voltage can be modified by an offset voltage such that only one polarity has to be taken into account during measurement.

Operating circuit for a discharge lamp with early EOL detection

The invention relates to a novel operating circuit for a low-pressure discharge lamp with early EOL detection via a measurement of the DC voltage between the electrodes . In this case, an electrode interrogation can be carried out by checking a respective connection via the electrodes to a respective reference potential.

EOL detection with integrated filament interrogation

The invention relates to a circuit arrangement for operating at least one discharge lamp, which has a half-bridge inverter (T,, T,, A) with a downstream load circuit (LD, CR) and has a half-bridge capacitor (CK) and also a monitoring apparatus for monitoring a change in the voltage drop across the half-bridge capacitor (CK) which is caused by the occurrence of a rectifying action in the at least one discharge lamp LP. According to the invention, the monitoring apparatus has a first RC element (R,, C,) and a second RC element (R,, C,), which are connected to one another by a threshold switch (DC), and means for detecting the switching state of the threshold switch (DC). The first RC element (R,, C,) is connected to the center tap of the half-bridge inverter, and the second RC element (R,, C,) is connected to the half-bridge capacitor (CK).

Circuit arrangement for operating at least one discharge lamp

The invention relates to an coil former and at least one wire winding arranged on the coil former, the coil former (,) having a cylindrical sleeve (,) whose cylinder axis runs parallel to the winding axis (A&mdash;A) of the at least wire winding, and at least two side walls (,) arranged perpendicularly to the winding axis (A&mdash;A), and the cylindrical sleeve (,) and the side walls (,) forming at least one winding space for the at least one wire winding (,). According to the invention, the at least two side walls (,) each have at least one shoulder (,), which subdivide the at least one winding space into a non-constricted first region (B,) and into at least one constricted second region (B,). In addition, the inductance element has electrical insulation (,), which bears on the at least one shoulder (,) of the side walls (,) and separates the non-constricted first region (B,) from the at least one constricted second region (B,).

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Munich, Germany

Martin Grabner