Patent Treuhand Gesellschaft Fur Elektrische Gluhlampen Mbh

Osram Gesellschaft MIT Beschraenkter Haftung

Osram Ag

Patent-treuhand-gesellschaft Fuer Elektrische Gluehlampen Mbh

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

Osram Gmbh

Osram Gesellschaft MIT Beschrankter Haftung

Bernhard Schemmel

Olaf Busse

Bernd Rudolph

Harald Schmitt

Arwed Storm

Thomas Pollischansky

Kay Schmidtmann

Markus Heckmann

Reinhard Lecheler

Siegfried Mayer

Michael Weirich

Horst Werni

Thomas Siegmund

Alfons Lechner

Wolfgang Hierl

Raphael Stocker

An electronic ballast for an electrical lamp () provided with a first () and a second filament (), includes a heating device which is used to heat the filaments () and includes a resonance circuit (), and an evaluation unit () designed for the evaluation of at least one measuring value of an electrical parameter during pre-determinable adjustments of operating conditions of the resonance circuit (). The number of filaments () of the electrical lamp () in electrical contact with the electronic ballast () can be identified according to the measuring value, and the electrical lamp () can be switched on by the electronic ballast () according to the identified number. A method for operating an electrical lamp by an electronic ballast is also described.

Electronic ballast and method for operating an electrical 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

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 invention relates to an electronic ballast device for operating an electric lamp (), comprising a first () and a second lamp filament (), wherein the lamp filaments () are electrically connected to a heating circuit () during a pre-warming phase for the electric lamp () said heating circuit () being of such a form that the heating current generated by the heating circuit () during an operational phase of the electric lamp () amounts to between 20% and 60% of the lamp current of said electric lamp (). The invention further relates to a method for operation of an electric lamp with an electronic ballast device.

Electronic ballast and method for operating an electric lamp

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 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

An operating circuit for a discharge lamp (LP) having preheatable electrodes includes a device (C , T , T , T , G) for preheating the electrodes. The device includes a resonant circuit (C , T ) which oscillates during preheating. During operation, the operating circuit produces an AC voltage having a frequency that is moved through a frequency range, records the response of the resonant circuit (C , T ) by measuring an electrical variable (UC ), and identifies the resonant frequency of the resonant circuit (C , T ) from the electrical variable (UC ), and preheats the electrodes by setting the frequency of the AC voltage to the resonant frequency.

Operating device for discharge lamps having a preheating device

A method and circuit arrangement for operating a fluorescent lamp (LA), comprising a half-bridge arrangement ( ) whose output signal can be fed to a load circuit (LK; ), it being possible to connect a fluorescent lamp (LA) with filament electrodes (W , W ) to the load circuit (LK; ), a preheating device (L , L , C ) for preheating the filament electrodes (W , W ) of the fluorescent lamp (LA), and a power determining device ( ) for determining a preheating power value that represents a measure of the power that is converted in the filament electrodes (W , W ) during preheating, wherein the power determining device ( ) can be used to determine the power flowing into the load circuit (LK; ) during preheating.

Circuit arrangement for operating a fluorescent lamp

An electronic ballast for discharge lamps with electrode filaments. The ballast contains a frequency-selective device, which suppresses an auxiliary heating current in the electrode filaments during operation of the lamp. Heating of the electrode filaments is possible only within a narrow frequency band.

Ballast for gas discharge lamps with shutdown of the filament heating

The invention relates to a circuit arrangement for operating at least one discharge lamp (LP) on a half-bridge inverter (Q,, Q,), having at least one coupling capacitor (C,) and having a switch-off device (T,, A) which permanently switches off the half-bridge inverter (Q,, Q,) when the lamp (LP) refuses to start. According to the invention, the circuit arrangement has first and second devices (V,, V,) for monitoring the voltage drop across the at least one coupling capacitor (C,) and for activating the switch-off device (T,, A) as a function of the voltage drop detected across the at least one coupling capacitor (C,). If the voltage across the coupling capacitor (C,) deviates substantially from its normal value, for example owing to the occurrence or the rectifying effect at the end of the service life of the discharge lamp (LP), the half-bridge inverter (Q,, Q,) is shut down by the switch-off device (T,, A).

Growing community of inventors

Wessling, Germany

Bernhard Schemmel