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Method for operating a discharge lamp and projection arrangement

A technology for projection devices and discharge lamps, which is applied to lighting devices, electric light sources, electrical components, etc., can solve the problems of time consumption, operation mode and difficulty of suitable commutation diagrams, etc., so as to prolong the service life, improve the service life, Improve the effect of flickering performance

Active Publication Date: 2015-05-20
OSRAM GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is extremely time consuming and makes it difficult to find the operating mode of the discharge lamp and a suitable commutation pattern
However, an operating mode of the discharge lamp has not yet been found which satisfactorily reconciles the two requirements of a long service life of the discharge lamp and flicker-free operation of the discharge lamp

Method used

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  • Method for operating a discharge lamp and projection arrangement
  • Method for operating a discharge lamp and projection arrangement
  • Method for operating a discharge lamp and projection arrangement

Examples

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Embodiment Construction

[0042] figure 1 A schematic diagram of a color wheel 10 for a projection device according to an embodiment of the present invention is shown. The color wheel 10 here has, for example, six color segments 12a, 12b, 12c, 12d, 12e and 12f, in particular a red segment 12a, a yellow segment 12b, a white segment 12c, a cyan segment 12d, Blue segment 12e and green segment 12f. Between two color segments 12 a , 12 b , 12 c , 12 d , 12 e and 12 f in each case there is a so-called dead zone 14 , which is also called a spoke. The color wheel 10 is illuminated by a discharge lamp, in particular a high-pressure gas discharge lamp, which is illuminated by an alternating current I according to a preset commutation pattern 16a, 16b (cf. figure 2 , image 3 with Figure 4 ) manipulation. The light of the lamp impinges here on predetermined areas of the color wheel 10 , so that the color segments 12 a , 12 b , 12 c , 12 d , 12 e and 12 f are illuminated sequentially when the color wheel 10...

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Abstract

Various embodiments provide a projection arrangement. The projection arrangement may include a discharge lamp; and a ballast for the discharge lamp. The ballast is designed to provide, during operation of the projection arrangement, a lamp current in the form of alternating current and having an average frequency and a preset waveform, which has a preset commutation scheme, to the discharge lamp. The preset commutation scheme is preset by a preset time sequence of commutations of the lamp current. The ballast is designed to provide the lamp current in such a way that the preset commutation scheme of the lamp current is deviated from repeatedly with at least one preset intervening time period by at least one DC phase with a preset time duration.

Description

technical field [0001] The invention is based on a method for operating a discharge lamp, wherein during operation the discharge lamp is supplied with a lamp current in the form of an alternating current with a mean frequency and a predetermined waveform with a predetermined changeover time. A commutation diagram, wherein said commutation diagram preset is preset by a preset time-sequenced commutation of said lamp current, and wherein at least one preset time interval is repeatedly passed through at least one with a preset duration The DC phase deviates from the preset commutation diagram. Furthermore, the invention relates to a projection device having a discharge lamp and a ballast for the discharge lamp, the ballast being designed to, when operating the projection device, constitute an alternating A variable current lamp current having an average frequency and a preset waveform having a preset commutation pattern is supplied to the discharge lamp, wherein the preset commut...

Claims

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Application Information

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IPC IPC(8): H05B41/28
CPCH05B41/16H05B41/2928H05B41/38H05B41/3928
Inventor 马克·齐希诺贝特·马格
Owner OSRAM GMBH
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