Patent Treuhand Gesellschaft Fur Elektrische Gluhlampen Mbh

Osram Gesellschaft MIT Beschraenkter Haftung

Osram Ag

Osram Gmbh

Kay Schmidtmann

Bernhard Schemmel

Bernd Rudolph

Markus Heckmann

Olaf Busse

Arwed Storm

Harald Schmitt

Reinhard Lecheler

Siegfried Mayer

Thomas Pollischansky

Horst Werni

Alfons Lechner

Thomas Siegmund

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

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Munich, Germany

Kay Schmidtmann