Osram Ag

Osram Gmbh

Patent-treuhand-gesellschaft Fur Elektrische

Kai Wolter

Christian Breuer

Markus Baier

Andreas Huber

Oskar Schallmoser

Norbert Magg

Franz Bernitz

Martin Brueckel

Josef Kroell

Peter Flesch

Bärbel Dierks

Martin BRÜCKEL

Josef KRÖLL

A method for operating a high-pressure discharge lamp with a variable power is disclosed. Said method utilizing at least the following steps: (a) providing high-pressure discharge lamp, which has a nominal operating power; (b) operating the lamp with an instantaneous power, where the instantaneous power lies within relative lower and upper power limits, respectively, and said limits may depend on an average power, and said instantaneous power may lie within a predetermined absolute lower and upper power limit; (c) determining the average power from a one-sided moving average value of the instantaneous power or the exponential smoothing of the instantaneous power of a time segment of predefined length.

Method for operating a high-pressure discharge lamp with a variable power

Various embodiments may relate to a circuit arrangement for operating at least one discharge lamp having a commutation device and a control device which is coupled to the commutation device. A first measuring device is used to determine in each case first measurement values, which represent a measure of the magnitude of electrode peaks of the discharge lamp, within a test operating phase in which the first electrode and the second electrode are supplied with energy in an asymmetrical manner. A second measuring device is used to determine a second measurement value which is correlated with the current through the discharge lamp at least during the test operating phase. The control device is designed to actuate the commutation device at least as a function of the determined first measurement values and second measurement values. Various embodiments further relate to a corresponding method for operating at least one discharge lamp.

Circuit arrangement and method for operating at least one discharge lamp

A method for operating a gas discharge lamp featuring a gas discharge lamp burner and a first and a second electrode, wherein the electrodes have a nominal electrode separation in the gas discharge lamp burner before their first activation and said nominal separation is correlated to the lamp voltage. The method may include checking whether the off-time, corresponding to the time duration between two DC voltage phases, has expired; and if the off-time has expired, omitting commutations or applying pseudo-commutations for a predefined time duration which depends on the lamp voltage in such a way that a time duration of the omission of at least one of commutations and application of pseudo-commutations is predefined for each lamp voltage.

Method and electronic operating device for operating a gas discharge lamp and projector

The present invention relates to a method for operating an illumination system, which illumination system has a high pressure discharge lamp driven with a commutating lamp current (IL), and a color filter system for filtering the light of the high pressure discharge lamp in a plurality of sequential color segments (A, B, D, E, G, H). The invention further relates to an illumination system for embodying the inventive method, and to a computer program product which can be loaded into an inventive illumination system in order to configure said illumination system in accordance with the inventive method. According to the invention, prior to a commutation in an intermediate phase (ZP), the lamp current (IL) passes through an intermediate phase pulse (DP), during which the light of the illumination system is suppressed. When a change occurs in the course of the lamp current preceding the intermediate phase (ZP), the intermediate phase pulse (DP) occurring in the intermediate phase is adapted in such a way that the change is at least partially compensated in the effect thereof on the electrode temperature at the time of the commutation.

Method for operating an illumination system with sequential color filtering and a high pressure discharge lamp

A circuit arrangement () for operation of a high-pressure discharge lamp having a commutation device (K), which has an input (E, E) for coupling to a DC voltage source and has an output (A, A) for coupling to the high-pressure discharge lamp (EL). A control apparatus () is configured to commutate the polarity with which the voltage (U), which is applied to the input (E, E) of the commutation device (K), is coupled to the output (A, A) of the commutation device (K). A synchronization apparatus () is configured to provide a synchronization signal (Sy) at its output (A, A). A timer apparatus () is configured to produce a commutation initiation signal (KA) at its output (A, A), which commutation initiation signal (KA) is synchronized with a predeterminable operating frequency of the high-pressure discharge lamp (EL). A pattern apparatus () stores a choice of possible commutation times, with the choice of the possible commutation times being synchronized in time to the synchronization signal (Sy).

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

High-pressure discharge lamps may explode at the end of their life. In order to be able to predict an explosion, the gradient of the operating voltage is evaluated. If a risk of explosion is detected, the lamp operation is interrupted.

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Berlin, Germany

Kai Wolter