Lighting assembly and method of operating a discharge lamp

A technology of a lighting device and an operating method, which is applied to lighting devices, electric light sources, electrical components, etc., can solve the problems of discharge lamp maintenance failure, loss of luminous flux, etc.

Inactive Publication Date: 2007-12-26
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially in applications where a point source of light is required, such as in projection applications, this will result in a loss of luminous flux
Electrode ablation is therefore the cause of discharge lamp maintenance failures

Method used

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  • Lighting assembly and method of operating a discharge lamp
  • Lighting assembly and method of operating a discharge lamp
  • Lighting assembly and method of operating a discharge lamp

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0031] Figure 1 shows a UHP lamp 10 as an example of a HID lamp. A quartz bulb 12 surrounds a generally rotationally symmetrical discharge vessel 14 . The outer diameter of the bulb is 10.2 mm; the inner diameter is 5 mm. An electrode 16 is also arranged inside the discharge vessel 14 shown in FIG. 2 . The discharge tube 14 is sealed from the outside. Electrodes 16 are in electrical contact with external connectors through molybdenum sheets 18 .

[0032] The diameter of the electrode shown in FIG. 2 is 900 μm, and the electrode is only used as an illustrative example, and is not scaled to exact dimensions. These electrodes consist of a tungsten rod around which a coil of tungsten filament is wound. Each coil includes 16 inner windings and 14 outer windings, where the diameter of the filament is 175 μm.

[0033] The electrode distance d shown in the examples is 1.5 mm.

[0034] The filling of the discharge vessel 14 consists of 30 mg of mercury, 35 nmol of bromine and 200...

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PUM

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Abstract

A lighting assembly, a driver circuit, and a method of operating a discharge lamp are described. A discharge lamp (10) comprises a discharge vessel (14) with at least two electrodes (16) arranged at a distance d for generating an arc between the electrode (16). Driver electronics (32) operate the lamp (10) with electrical power. In order to reduce electrode burn-back, the driver electronics operate the lamp according to a switch-off sequence, which includes a power ramp interval (24) where the lamp (10) is operated with increasing electrical power over time, and subsequently the lamp (10) is switched-off. Also, the driver electronics (32) operate the lamp according to a turn-on sequence upon turning on the lamp (10) with a first turn-on interval (20), where the lamp is operated with electrical power increasing up to an initial maximum power value, and a power ramp interval (22) during which the lamp is operated with electrical power increasing over time from the initial maximum power value to nominal power PN. The initial maximum power value is less than the nominal power value of the lamp.

Description

technical field [0001] The invention relates to a lighting device comprising a discharge lamp and a driver circuit and to a method of operating a discharge lamp. Background technique [0002] Various discharge lamps are known which comprise a discharge vessel with at least two electrodes arranged at a certain distance. In these lamps, an electric arc is generated between the electrodes. [0003] The invention relates in particular to HID lamps (High Intensity Discharge Lamps). Known lamps of the HID type have different fillings in their discharge vessel, the filling composition being selected, for example, from mercury (Hg), noble gases, especially xenon (Xe), and metal halides. The known types of lamps also differ in their geometry, in particular in their electrode spacing. Here, the short-arc lamp has an electrode distance of less than 2.5 mm. [0004] Short-arc lamps with high power density include UHP (Ultra High Performance) and CPL (Compact High Power) lamps. US-A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B41/292
CPCH05B41/2928
Inventor J·波尔曼雷特施
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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