Ledvance Gmbh

Osram Ag

Osram Gesellschaft MIT Beschraenkter Haftung

Patent-treuhand-gesellschaft Fur Elektrisch Gluhlampen Mbh

Patent-treuhand-gesellschaft Für Elecktrisch Glühlampen Mbh

Osram Gmbh

Osram Gesellschaft MIT Beschrankter Haftung

Andreas Mitze

Thomas Mudra

Werner Longhino

Arwed Storm

Markus Ziegler

Peter Krummel

Xusheng Yang

Peter Hummel

A double-capped LED lamp operates on an electronic ballast for a low-pressure discharge lamp. The lamp has a first lamp cap having at least one first lamp connection, a second lamp cap having at least one second lamp connection, and an LED driver unit, which is electrically coupled between the first lamp connection and the second lamp connection, for activating a plurality of LEDs on the basis of a lamp voltage supplied by the electronic ballast between the first lamp connection and the second lamp connection in a first operating state. The lamp comprises a switching element for the galvanic separation of the first lamp connection from the LED driver unit in a second operating state, and an activation device for switching at least from the second operating state into the first operating state according to the lamp voltage.

LED double-capped lamp, for operation on an electronic ballast for a low-pressure discharge lamp, especially a fluorescent lamp, and method for operating such a lamp

A lighting system is provided. The lighting system includes at least one light-emitting diode and a monitoring output, and a fault signal is present at the monitoring output in the event of a defect of the light-emitting diode during operation of the lighting system. The lighting system also includes a switch for switching a connection between a current source and the light-emitting diode. The lighting system further includes a comparator which is coupled with the monitoring output and the switch. The current source is disconnected from the light-emitting diode in an activated state of the switch, and the comparator is configured to switch the switch into the activated state when the fault signal is present at the monitoring output.

Lighting system

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.

Method and circuit arrangement for operating at least one discharge 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 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

The invention relates to a circuit and to a method for operating a lamp. In this case, a reactance for the purpose of detecting the lamp voltage, a zero point detection device for the purpose of determining the zero crossing of the current through the reactance and a current measuring device and, finally, a track-and-hold circuit triggered by the zero point detection device are used to measure the lamp current in such a way that the influence of parasitic capacitances is still ruled out.

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Traunreut, Germany

Andreas Mitze