Osram Gesellschaft MIT Beschraenkter Haftung

Patent Treuhand Gesellschaft Fur Elektrische Gluhlampen Mbh

Osram Ag

Patent-treuhand-gesellschaft Fur Elektrisch Gluhlampen Mbh

Osram Gmbh

Bsh Hausgerate Gmbh

Osram Gesellschaft MIT Beschrankter Haftung

Thomas Mudra

Werner Longhino

Andreas Mitze

Andreas Huber

Markus Ziegler

Gregor Blatnik

Roman Pacnik

Primoz Dornik

Tadej Holcinger

Stephan Schaufler

Simon Haitzer

Florian Daxenberger

In various embodiments, a dimmable operating device for the combined operation of a gas discharge lamp and a semiconductor light source is provided. The dimmable operating device may be configured such that only the semiconductor light source is operated in the lower dimming range and only the gas discharge lamp is operated in the upper dimming range, and at the changeover points at which one sort of light source out of the semiconductor light source and the gas discharge lamp is switched off or on, at the same time a jump in power is applied to the other light source out of the semiconductor light source and the gas discharge lamp, with the result that the human eye cannot perceive, or can only perceive with difficulty, the changeover point.

Operating device and method for the combined operation of gas discharge lamps and semiconductor light sources

A circuit arrangement is provided for operating a fluorescent lamp with a first and a second filament, the circuit arrangement including a heater for the first and the second filament, wherein the circuit arrangement furthermore includes: an apparatus for storing at least one threshold value for at least one operational parameter of the fluorescent lamp; an apparatus for determining the value of the at least one operational parameter; and a control apparatus, which is configured to activate the heater for the first and the second filament for a predeterminable period of time in the event of the at least one threshold value for the at least one operational parameter being exceeded by the determined value of the at least one operational parameter.

Circuit arrangement, and method for the operation of a fluorescent lamp

A circuit arrangement for operating at least one first and second lamp each provided with a first and second coil electrode includes a first and second terminal for the first coil electrode of the first lamp, a first and second terminal for the second coil electrode of the first lamp, a first and second terminal for the first coil electrode of the second lamp, a first and second terminal for the second coil electrode of the second lamp, at least one supply connection for supplying voltage to the respective first coil electrode of the at least one first and second lamp, and at least one preheating device for the respective first coil electrode of the at least one first and second lamp. The second terminal of the first coil electrode of the first lamp is coupled to the second terminal of the first coil electrode of the second lamp while the preheating device encompasses a first preheating inductor and a second preheating inductor.

Circuit arrangement and method for operating at least one first and a second lamp

An electronic ballast for the operation of a lamp arrangement includes at least one lamp, in particular, a low-pressure discharge lamp and at least one transformer for balancing the lamp currents, whereby the transformer has two windings, provided for one or more lamps of the lamp arrangement. The transformer is embodied as a saturation balancing choke.

Electronic ballast

The invention relates to a circuit arrangement for detecting a crest factor of a lamp current or a lamp operating voltage of an electric lamp (), the circuit arrangement having a first subcircuit (), which is designed to determine an averaged value from an input signal applied to the circuit arrangement, having a second subcircuit (), which is designed to determine a maximum permissible value from the input signal applied to the circuit arrangement and having a comparator circuit (), which is designed to produce a comparison signal from the output signal of the first subcircuit () characterizing the averaged value and from an output signal of the second subcircuit () characterizing the maximum permissible crest factor. The invention also relates to a method for detecting such a crest factor. One further aspect of the invention relates to an electronic ballast () which has a circuit arrangement () according to the invention. Furthermore, the invention also relates to a method for operating an electric lamp, in which a crest factor is detected in accordance with a method according to the invention.

Circuit arrangement and method for detecting a crest factor of a lamp current or a lamp operating voltage of an electric lamp

An apparatus for the closed-loop and open-loop control of filament heating for a lamp, in particular for a fluorescent lamp, has a control loop into which a first filament (W), an operational-parameter detection element (E), a heating controller (H) and a first actuating element (S) are connected. The heating poser of the first filament (W) is detected by means of the operational-parameter detection element (E) and, on the basis of this, a manipulated variable (SG) is determined, by means of which this first filament (W) is subjected to closed-loop control. Furthermore, at least one second filament (Wto Wn), which is not connected in the control loop, is controlled on the basis of the determined manipulated variable (SG).

Method and apparatus for the closed loop and open loop control of filament heating for lamps

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Kastl, Germany

Thomas Mudra