Patent Treuhand Gesellschaft Fur Elektrische Gluhlampen Mbh

Patent-treuhand-gesellschaft Fuer Elektrische Gluehlampen Mbh

Osram Gmbh

Osram Ag

Osram Gesellschaft MIT Beschraenkter Haftung

Inventronics, Inc.

Harald Schmitt

Markus Heckmann

Arwed Storm

Thomas Pollischansky

Bernd Rudolph

Siegfried Mayer

Bernhard Schemmel

Olaf Busse

Reinhard Lecheler

Horst Werni

Thomas Siegmund

Alfons Lechner

Kay Schmidtmann

Klaus Fischer

Rene Twardzik

Joachim Mühlschlegel

Klaus Schadhauser

Walter Hirschmann

Ludwig Reiser

Uwe Liess

Peter Haeussinger

Wolfgang Hierl

Ken Liu

Henry Hoo

Raphael Stocker

Various embodiment may relate to a circuit arrangement for operating a load, including an input for inputting a mains input AC voltage, a power converter circuit, a converter circuit which converts the mains input AC voltage rectified by the power converter circuit into an output voltage, a control circuit for controlling the converter circuit, and a linear regulating circuit which sets a predetermined load current at the load. The load current is a direct current with a uniform current intensity. The control circuit controls the converter circuit in such a manner that the current intensity of the load current is reduced when the output voltage is at a minimum.

Circuit arrangement and method for operating semiconductor light sources

A circuit arrangement for operating light sources includes input terminals for a power supply system voltage, a first rectifying circuit, a boost converter having output terminals, a half-bridge arrangement having two switches, which is connected to the output terminals of the boost converter, an inductance, the first terminal of which is coupled to the centre point of the half-bridge, and a second rectifying circuit, the first input terminal of which is coupled to the second terminal of the inductance and the second input of which is coupled to one of the output terminals of the boost converter. The output terminals of the second rectifying circuit are coupled to the inputs of a current-compensated inductor. At least one light source is connected to the output terminals of the current-compensated inductor, and the output terminals of the current-compensated inductor are coupled to an output terminal of the boost converter via filter capacitors.

Circuit arrangement for operating light sources

A circuit arrangement may include: an inverter comprising first electronic and second electronic switches coupled in series between a first and second input connections to form a bridge center point; a drive apparatus for the first electronic switch and the second electronic switch; a current-measuring apparatus which is designed and arranged to measure the current through the inverter; a short-circuiting apparatus which is designed to short-circuit the output when the output voltage exceeds a first predefinable threshold value; and an evaluation apparatus which is coupled to the current-measuring apparatus and is designed to determine the mean value of the current through the inverter and, when the mean value undershoots a second predefinable threshold value, to drive the drive apparatus in such a manner that the latter influences the operation of the inverter, by driving the electronic switches in such a manner that the current in the short-circuiting apparatus is reduced.

Circuit arrangement and method for operating at least one luminous means

A circuit arrangement for operating a low-pressure discharge lamp may include a voltage source with two terminals; switches; and a series resonant circuit; a controller configured to control the switches such that an AC voltage is applied to the resonant circuit; a PTC thermistor coupled on one side to a circuit point of the resonant circuit and on the other side, at least one of via a diode, to the first terminal of the voltage source and, via a diode to the second terminal of the voltage source; a resistive element connected in series with a diode in the circuit between a terminal of the voltage source and the PTC thermistor; and an evaluation device configured to tap off the voltage drop across the resistive element and being coupled to the controller in order to deactivate the controller.

Circuit arrangement and method for operating a low-pressure discharge lamp

In various embodiments, a circuit for driving a fluorescent lamp is provided. The circuit may include a half bridge including a first switch and a second switch; a drive unit for driving the first switch and the second switch, it being possible for a predetermined state to be established using the drive unit, and it being possible for the driving of the first and the second switch to be modulated as a result of the predetermined state using the drive unit.

Circuit for controlling a fluorescent lamp, method for operating the circuit, and system comprising the circuit

A circuit arrangement for starting and operating one or more discharge lamps comprising a self-oscillating inverter (), a resonant circuit (), a low-pressure discharge lamp (), a starting voltage controller () with a variable resistor (R), and a lamp filament heating controller (), wherein the lamp filament heating controller includes an additional variable resistor (R) in the resonant circuit, which variable resistor measures the current flowing in the resonant circuit, and, in the event of a threshold value being exceeded, disconnects the half-bridge transistor (Q) and thus limits the current flowing in the resonant circuit, this additional variable resistor (R) being bypassed by a switch (Q), depending on the lamp state.

Circuit arrangement and method for starting and operating one or more discharge lamps

The present invention relates to an electronic ballast for discharge lamps (LA) which have preheatable electrodes (E, E). The electronic ballast has a measuring apparatus (M), which is designed to measure, during the preheating process, a variable, which is correlated with the electrode temperature increased by the preheating, of at least one of the electrodes (E, E) of a connected discharge lamp (LA), and a control apparatus (C), which is designed to match the electrode temperature, during the preheating process, in response to the measurement by adjusting an operational parameter of the electronic ballast. Furthermore, the electronic ballast is designed to detect cross discharges or a sufficient operating temperature of one of the electrodes (E, E) and possibly to ignite the discharge.

Ballast for a discharge lamp with adaptive preheating

The present invention relates to a circuit arrangement for operating at least one electric lamp and at least one LED including: an inverter having a bridge circuit having at least one first bridge transistor and one second bridge transistor arranged in series with one another, a center point of the bridge circuit being defined between the first and second bridge transistors; a lamp supply unit for supplying the electric lamp with energy from the bridge circuit, which includes a supply line with an inductance, via which the center point (M) of the bridge circuit is coupled to a first connection for the electric lamp; the lamp supply unit including an LED supply unit, which is designed to supply the at least one LED with energy. Moreover, it relates to an operating method for at least one electric lamp and at least one LED using such a circuit arrangement.

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

The drive signal for a switchable heating transformer of an electronic ballast should be capable of being produced in a simple manner. For this purpose, the invention provides for an oscillating inverter voltage, which has a variable inverter frequency, to be tapped off, for example, at the half-bridge center point. The inverter frequency is then preferably converted into a drive signal by a charge pump (C, C, D, D). As a function of this drive signal, the heating transformer (HT) is switched. Synchronization with externally controlled sequence control of the electronic ballast is therefore also possible.

Drive circuit for a switchable heating transformer of an electronic ballast and corresponding method

The present invention relates to a circuit arrangement for operating at least one electric lamp (LP) having a drive circuit (), which has at least one terminal for a system voltage (U) on the input side and at least one terminal for the at least one electric lamp (LP) on the output side; the drive circuit () having a control unit () and a step-up converter having a step-up converter inductor (L) and a switch (S), and the control unit () being designed to operate the step-up converter in a discontinuous mode, in which the current (I) through the step-up converter inductor (L) has gaps, the duration (&#x25ae;t) of these gaps being varied. It also relates to an operating method for at least one electric lamp (LP) using such a circuit arrangement.

Circuit arrangement and method for operating at least one electric lamp

The present invention relates to an electronic ballast for discharge lamps, for example low-pressure discharge lamps, having a converter having a switching element and a two-part lamp inductor which is connected upstream and downstream of the discharge lamp. An electronic ballast according to the invention has a smoothing circuit which reduces voltage jumps caused by switching operations in the converter at the lamp terminals.

Smoothing circuit for improving EMC

A circuit arrangement for operating at least one first and one second lamp which can be inserted in the circuit arrangement, each lamp having a first and a second filament, having a drive circuit for the purpose of driving the at least one first and second lamp, the drive circuit being designed to operate the at least one first and second lamp using a radiofrequency signal, it also includes: a comparator circuit for comparing a first and a second voltage potential within the circuit arrangement, and a deactivation apparatus for deactivating the drive circuit, the comparator circuit being designed to activate the deactivation apparatus if the difference between the first and the second voltage potential exceeds a predeterminable limit value during operation of the at least one first and one second lamp using a radiofrequency signal.

Circuit arrangement for operating at least one first and one second lamp which can be inserted in said circuit arrangement

In a circuit arrangement for operating light sources, inexpensive technologies for power factor correction can be used in combination. A resonant capacitor in a reactance network for coupling the light source is of dual design (C, C). A degree of freedom is thus produced which makes it possible to optimize the costs of the circuit arrangement.

In a circuit arrangement for operating light sources, inexpensive technologies for power factor correction can be used in combination. Owing to the combination of a dual charge pump and a valley fill circuit it is also possible to adhere to relevant standards for rated current harmonics even at rated powers of over 25 W whilst maintaining low component loading.

A device for operating a plurality of discharge lamps is to be fashioned cost-effectively. Consequently, two discharge lamps () are operated with the aid of one ballast in whose load circuit the heating current for the individual incandescent filaments () is transmitted via a heating transformer with three secondary windings (L, L, L). The associated primary winding (L) is located in a coupling-out circuit () with the aid of which the required heating energy is coupled out via an inductor (L). The heating current can be controlled by a temperature-sensitive thermistor (PTC).

Growing community of inventors

Munich, Germany

Harald Schmitt