Osram Gmbh

Osram Ag

Osram Gesellschaft MIT Beschrankter Haftung

Bernd Koch

Stefan Lichtenberg

Joachim Mühlschlegel

Johannes Buttstaedt

Stefan Dunkel

Leon Grabinski

Janbernd Hentschel

Martin Tueshaus

A gas discharge lamp includes at least two electrodes arranged in a manner spaced apart with a spacing in a discharge vessel filled with gas. A method of operating a ballast includes applying electrical energy to the electrodes. The ballast provides an electrical electrode current including a ripple current being dependent on an operating frequency of converter. Operating frequency is dependent on a charging time period and a discharging time period for an electrical energy store of the converter. The operating frequency is chosen such that the ripple current in the region of an arc discharge brings about a resonant excitation of the gas, and providing a pause time period between the discharging time periods and the respectively succeeding charging time period, the time duration of which pause time period is chosen such that a sum formed from the time periods attains the period duration corresponding to the operating frequency.

Operating a ballast for a gas discharge lamp

A lamp holder () for a gas discharge lamp (), having at least two receptacles (B, B) for at least two pins (P, P) of a gas discharge lamp (), wherein at least one shielding conductor (S, S, S, S) is disposed in the vicinity of each receptacle (B, B).

Lamp holder and lamp base for a gas discharge lamp

A high-pressure discharge lamp having an ignition aid may be provided, having a discharge vessel that is surrounded by gas, wherein the discharge vessel includes two ends having fusings in which electrodes are secured, wherein an ignition aid is fastened on at least one fusing, wherein the ignition aid has a local field amplifier in the form of a tip or a curved part, wherein the ignition aid is configured to cause a corona discharge in the surrounding gas which emits UV radiation into the discharge vessel.

High-pressure discharge lamp having a capacitive ignition aid

A method for igniting and for starting high-pressure discharge lamps is provided. The method may include applying a takeover voltage to the lamp for a predetermined time of a burst; superimposing ignition pulses on the takeover voltage in such a way that the voltage of the ignition pulses and the takeover voltage are added up and an interruption being provided between two bursts; and changing the ignition pulses from burst to burst or within a burst from the positive half-cycle of the takeover voltage to the negative half-cycle of the takeover voltage, and vice versa.

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Berlin, Germany

Bernd Koch