Osram Gesellschaft MIT Beschraenkter Haftung

Patent Treuhand Gesellschaft Fur Elektrische Gluhlampen Mbh

Osram Ag

Osram Gesellschaft MIT Beschrankter Haftung

Patent-treuhand-gesellschaft F&uuml;r Elektrische Gl&uuml;hlampen Mbh

Patent-treuhand-gesellschaft Fuer Gluehlampen Mbh

Osram Gmbh

Bernhard Reiter

Andreas Huber

Christian Breuer

Martin Brückel

Franz Raiser

Ralf Hying

Peter Niedermeier

Henning Rehn

Andre Nauen

Simon Lankes

Martin Brueckel

Frederik Hempelmann

Martin BRÜCKEL

A circuit arrangement for operating a high-pressure discharge lamp with an operating circuit for the high-pressure discharge lamp with an input for receiving a switch-on/switch-off signal for the high-pressure discharge lamp and at least one output for providing an operating signal to the high-pressure discharge lamp, wherein the operating circuit is designed to reduce the power of the operating signal provided at the at least one output once a switch-off signal has been received at its input, wherein the operating circuit furthermore designed to provide the operating signal as an AC signal above a predeterminable power threshold value and as a quasi DC signal below the predeterminable power threshold value.

Circuit assembly and method for operating a high pressure discharge lamp

A circuit arrangement for operating an LED arrangement, wherein a controller transmits a current intensity value for a respective LED to a driver and the latter feeds the LED with current in a time sequence containing a check pulse, and wherein a measuring device is configured to measure the light emitted by the light-emitting diode on account of the check pulse, wherein the controller is configured to use only measurement values which represent the light of check pulses for the stipulation of current intensity values, and wherein the driver defines a main factor, which is dependent on at least one of the temperature of the LED and on the voltage dropped across said LED, wherein the driver is configured to multiply the current intensity value by the main factor and this product defines the current intensities of all the current pulses in the time sequence apart from the check pulse.

Method for operating a light-emitting diode arrangement, and circuit arrangement

The invention relates to a method for operating a gas discharge lamp, in which the shape of at least one electrode of the gas discharge lamp is changed, in which by changing the lamp current for a predeterminable duration, at least one current pulse is generated such that structures which have grown on the at least one electrode are at least partially removed, the current pulse being generated for the duration of at least one entire half cycle of the AC voltage or the alternating current if the gas discharge lamp is fed AC voltage or alternating current, and the current pulse being generated with a pulse duration of between approximately 0.1 s and approximately 5 s if the gas discharge lamp is fed DC voltage or direct current.

Method for operating a gas discharge lamp

A circuit arrangement for operating a discharge lamp is provided. The circuit arrangement may include a commutating device, which is configured to exhibit an input which is coupled to a direct-current source and has an output which can be coupled to a discharge lamp; the commutating device being configured in such a manner that it couples the direct-current source to the output and the polarity with which the direct-current source is coupled to the output can be commutated by a control device; the control device including a measurement input which is coupled to a measuring device which is configured to deliver a measurement value which is a measure of the magnitude of a lamp voltage; wherein the control device is configured to control the commutating device in such a manner that the polarity at which a higher lamp voltage prevails is coupled longer to the output.

Circuit arrangement for operating discharge lamps and method for operating discharge lamps

A circuit arrangement for starting a discharge lamp, comprising: a first and a second input terminal for connecting an input voltage; an inverter, which has an input and an output, the input being coupled to the first and the second input terminal; a first and a second output terminal for connecting the discharge lamp; a resonant inductor, which is coupled between the output of the inverter and the first output terminal; a resonant circuit, which comprises the resonant inductor; a regulating apparatus for regulating the frequency of the signal provided at the inverter output; and a current measuring apparatus, which is arranged so as to measure a current which is correlated with the current in the resonant circuit, wherein the regulating apparatus is adapted to regulate the frequency at the output of the inverter as a function of the measured current.

Circuit arrangement for firing a discharge lamp

A circuit arrangement for operating a discharge lamp, wherein the circuit arrangement comprises a commutation device, which has an input which is coupled to a DC source, and has an output which can be coupled to a discharge lamp. The commutation device is designed in such a way that it couples the DC source to the output, and the polarity at which the DC source is coupled to the output can be commutated by a control device. The control device has a sync input, and the polarity of the DC source is commutated in synchronism with sync pulses of a sync signal which can be applied at the sync input. The control device has a measuring input, which is coupled to a measuring device which is designed to provide a measured value which is a measure of the size of electrode peaks. The control device suppresses at least one commutation if the measured value overshoots or undershoots a predetermined threshold value.

Circuit arrangement for operation of discharge lamps, and method for operation of discharge lamps

Circuit arrangement for controlling a pulsed power supply having improved dynamics compared with conventional 'current mode' controllers. According to the invention, the gate signal of a switch (S) is integrated. As soon as this integral value exceeds the output signal of a control amplifier (CCL), the switch (S) is switched off again. The circuit arrangement is highly suitable for economically apportioning analog switching elements and functions which are implemented by a microcontroller (uC).

Circuit arrangement and method for controlling a pulsed power supply

A step-down controller has an input having a first and a second input terminal for applying an input voltage, an output having a first and a second output terminal at which an output voltage can be provided, a series circuit including a switch and an inductance which is coupled between the first input terminal and the first output terminal. The switch has a control input for applying a control signal. A first diode is coupled between a junction point between the switch and the inductance and a reference potential such that, when the inductance is freewheeling, a current flow through the first diode (D) is possible. There is a snubber network with a snubber capacitor, a second and third diode and an auxiliary inductance, a series circuit including the snubber capacitor, the third diode and the auxiliary inductance being coupled in parallel with the inductance.

Step-down controller circuit

A high-pressure discharge lamp (Lp) is fed with a square-wave current from an operating appliance. In order to reduce overshoots during the commutation of the lamp current, the set current value for the regulating device ( ) which is contained in the operating appliance is briefly reduced in the area of the commutation.

Operating appliance and an operating method for high-pressure lamps

A method for starting a discharge lamp having two filaments includes the following steps: ( ) preheating only one of the two filaments; ( ) igniting the lamp; ( ) operating the lamp with a direct current; and ( ) powering the lamp with an alternating current. The step of operating the lamp with a direct current has a duration that is preferably between 0.1 seconds and 2 seconds.

Method for starting a discharge lamp

Appliance for discharge lamps, which has a load circuit with a resonance point at a resonant frequency fres. In order to start the discharge lamps, the load circuit is fed with a square-wave source voltage Uq, whose period duration Tper multiplied by the resonant frequency fres of the load circuit produces approximately a natural number n which is greater than 1. The pulse duration Tpulse at the source voltage Uq is in a range which is described by the following condition:

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Munich, Germany

Bernhard Reiter