Patent Treuhand Gesellschaft Fur Elektrische Gluhlampen Mbh

Patent-treuhand-gesellschaft Fuer Elektrische Gluehlampen Mbh

Osram Gmbh

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

Osram Sylvania Inc.

Osram Ag

Osram Gesellschaft MIT Beschrankter Haftung

Patent-treuhand-gesellschaft Fur Gluhlampen Mbh

Osram S.p.a. - Societa' Riunite Osram Edison Clerici

Felix Franck

Markus Heckmann

Alessandro Scordino

Valery A Godyak

Klaus Fischer

Paolo De Anna

Francesco Angelin

Harald Dellian

Alex Oksengendler

Joachim Muehlschlegel

Sridharan Venk

Ugo Francescutti

Wolfram Sowa

Eugen Statnic

Enrico Raniero

Helmut Haeusser-Boehm

Theodor Kiermeier

Alessandro Maschietto

Marco Faccin

Aleksandar Nastov

Michele Menegazzi

Federico Poggi

Alberto Zanotto

A circuit arrangement for an LED luminaire comprises a plurality of LED strings, an anode terminal line, a cathode terminal line, a plurality of first switching elements, connected in series into the anode terminal line and subdivided into individual line sections, and a plurality of second switching elements, connected in series into the cathode terminal line and subdivided into individual line sections. Each of the LED strings may be connected to the anode terminal line via a first switching element and/or the second switching elements. Each of the first switching elements may be configured to feed an operating current to an LED string, to electrically connect line sections if the current flowing through the LED string exceeds a predetermined value, and to electrically isolate line sections if the current flowing through the LED string falls below a predetermined value.

Circuit arrangement for a light source

A light source module may include at least one LED cascade with a plurality of LEDs, a supply line, wherein at the input side the LED cascade is coupled thereto, and a ground line. The light source module further includes a communications line for coupling to a control device for the current to be provided by the current source, a thermal derating unit coupled between a first voltage source and the communications line and including a temperature-sensitive element, wherein the thermal derating unit applies a temperature dependent current component determined depending on the temperature-sensitive element, to the communications line, at least one current measurement resistor connected in series between the LED cascade and the reference potential, wherein the conductance of the current measurement resistor is proportional to the current requirement of the LED cascade, and at least one coupling resistor coupled between the coupling point and the communications line.

Light source module, power supply unit for operating a light source module of this kind, and lighting system

An arrangement for driving a light source, including a plurality of LED strings by means of a current generator, wherein each said LED string forms a respective current mesh with said current generator, includes: at least one inductor acting on said current meshes, in each of said current meshes, an electronic switch having a first, working node towards the LED string and a second, reference node opposed to the LED string. All the reference nodes of all the electronic switches are connected together, and the working node of each electronic switch is connected to the work node of at least another one of the electronic switches via at least one current averaging capacitor. The electronic switches can be selectively rendered conductive, each one at a respective time interval, thereby selectively distributing the current of the current generator over the LED strings.

Method of driving LED lighting sources and related device

A heatsink (), comprising a heatsink body () extending between two endsides () of the heatsink body. The heatsink is designed for introducing the heatsink with the first endside ahead into an aperture (), which is provided in a wall (), and for a thermal conductive connection of a heat-generating element () to the second endside, with a main direction of extent () of the heatsink body () from the first endside () to the second endside () being bent or sharply bent. Furthermore, an illumination system with such a heatsink is disclosed.

Heatsink and illumination system with a heatsink

A circuit arrangement for operating an LED and an fluorescent lamp may include a main rectifier; an auxiliary rectifier; an inverter, the output of said inverter having a terminal for connecting the fluorescent lamp; a starting device, wherein its first terminal is coupled to a control electrode of one of the switches of the inverter; a pull-down circuit; and a starting capacitor; wherein the second terminal of the starting device and the second terminal of the pull-down circuit are coupled to the first output terminal of the auxiliary rectifier; wherein the starting capacitor is coupled between the first and the second output terminal of the auxiliary rectifier; and wherein there is arranged in parallel with the starting capacitor a series circuit including a first and a second terminal for the LED and an LED switch, wherein the LED switch has a control electrode, an operating electrode and a reference electrode.

Circuit arrangement and method for operating at least one LED and at least one fluorescent lamp

A radio frequency (RF) power supply for an electrodeless lamp includes a pair of DC rails, an RF inverter having power input terminals connected between the rails, a first inductor arranged to inductively couple with an electrodeless lamp, first and second resonance capacitors that each connects a respective one of two input terminals of the first inductor to a same first rail of the pair of DC rails, and a second (ballasting) inductor connecting an output of the RF inverter to one of the two input terminals of the first inductor. Thus, the first inductor is connected in a symmetrical &#x3c0;-filter and supplied by two equal but phase-opposite voltages whose sum is the lamp voltage. The inductance of the ballasting inductor is significantly reduced so that the RF efficiency of the power supply is 96%.

Symmetrical RF power supply for inductively coupled electrodeless lamps

Circuit with a switch-off device for the operation of light sources The invention relates to a circuit with a switch-off device for the operation of light sources (Lp), have the following features:

Circuit with switch-off device for the operation of light sources

The invention relates to a circuit arrangement for operating lamps. The circuit arrangement essentially comprises a full bridge. According to the invention, at least one inductor is connected in series with a full-bridge branch for switching load relief purposes. The circuit arrangement is preferably suitable for operation using a charge pump. PFC is thus achieved in a single-stage arrangement.

Circuit arrangement having a full bridge with switching load relief for operating lamps

The selection of the dead time in the case of a half-bridge inverter influences the efficiency thereof. The optimal dead time, and thus the optimal switching-on time of a lower half-bridge transistor (T) is accomplished according to the invention by virtue of the fact that switching on is delayed until the current in a level shift transistor (T) has dropped below a given threshold. A further aspect of the invention consists in that the delay in switching on the lower half-bridge transistor (T) is immediately suppressed whenever a charging current flows in a trapezoidal capacitor, and this is accompanied by the rise of the half-bridge output voltage (UHB) after the traversal of a minimum.

Drive for a half-bridge inverter

A luminous element ( ) for a lamp is double helix-shaped, with two connection parts ( ) situated at one end of said double helix. The diameter (D , D ) of the double helix increases consistently in the direction of the two connection parts ( ) of the luminous element ( ). The invention also relates to a lamp with a luminous element of this type, to a method for producing a luminous element of this type and to a device for carrying out the production method.

Luminous element for lamp

A rectifier circuit matched for power factor correction. A first diode (D ), a second diode (D ), a third diode (D ) and a fourth diode (D ) are in a bridge arrangement. A first pole ( ) and a second pole ( ) of the bridge arrangement are connected to a source (U) which has at least one AC voltage component. An inductance (L ) is arranged in series with the third pole ( ) or the fourth pole ( ) of the bridge arrangement. A capacitance (C ) is connected between the first pole ( ) and the second pole ( ), and two of the four diodes (D , D , D , D ) are in the form of fast diodes.

Rectifier circuit suited to power factor correction

A circuit for switching on a partial circuit includes a first switching element (T ), a second switching element (T to T ), an activation circuit for the first switching element, a first diode (D ), a second diode (D ), and a third diode (D ). During operation, when the partial circuit is being switched on, first switching element (T ) is activated and second switching element (T to T ) is assigned no activity. The activation circuit for the first switching element (T ) includes a storage capacitor (C ) and a DIAC coupled to a control electrode of the first switching element (T ). First diode (D ), second diode (D ), and third diode (D ) are arranged such that stored energy in storage capacitor (C ) is more effectively utilized for activating the first switching element (T ), thus allowing use of a smaller capacitance for the storage capacitor (C ).

Circuit arrangement for switching on a partial circuit arrangement

Electronic transformers with a self-excited half bridge can be destroyed by high-voltage pulses from the mains supply lead. This can happen by the high-voltage pulse initiating a starting operation which leads to cross currents. This destruction mechanism is suppressed by specifically discharging a starting capacitor.

Electronic transformer with good immunity against high-voltage pulses

An electronic converter having an input circuit and an output circuit which, in addition to the converter function, carries out power-factor correction. A control circuit opens and closes an electronic switch as a function of the output voltage from the converter circuit and the voltage which is dropped across a current measurement sensor. The circuit has a logic ground LM and a power ground PM at different electrical potentials.

Electronic transformer

An electronic operating device for discharge lamps is disclosed in which an output terminal is connected via a coupling capacitor (CB) to a reference potential (E). An electric component (VC) which acts as a voltage source is inserted in series with the coupling capacitor (CB) in order to reduce the potential of an output terminal. The electric component (VC) consists in one embodiment of an inductor which is coupled to the lamp inductor.

Growing community of inventors

Munich, Germany

Felix Franck