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Method of shutting down a high pressure discharge lamp and driving unit for driving a high pressure discharge lamp

A technology for high-pressure discharge lamps and drive units, applied in the field of projector systems and drive units for driving high-pressure discharge lamps

Inactive Publication Date: 2012-07-04
KONINK PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But lamps that are extinguished in this way must be driven at a low level for a relatively long period of time before being extinguished, during which time all lamps in which they are incorporated cannot be moved due to the required power connections. projector system or beamer
Furthermore, the device is still operating and generates low noise level

Method used

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  • Method of shutting down a high pressure discharge lamp and driving unit for driving a high pressure discharge lamp
  • Method of shutting down a high pressure discharge lamp and driving unit for driving a high pressure discharge lamp
  • Method of shutting down a high pressure discharge lamp and driving unit for driving a high pressure discharge lamp

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Embodiment Construction

[0036] The dimensions of objects in the drawings are chosen for clarity and do not necessarily reflect actual relative dimensions.

[0037] exist Figure 1-2 A possible sequence of actions for switching off a mercury vapor discharge lamp is described in . It is self-evident that the values ​​mentioned in connection with these explicit courses of action are purely exemplary and relate, without limiting the generality of the invention, to a lamp with a nominal power of 120 watts in normal lamp operation. Mercury vapor discharge lamps. Obviously, these values ​​must be adjusted to suit whatever lamp or driver configuration is actually used.

[0038] figure 1 The steps in a simple shutdown sequence are shown. In step 100 a shutdown request is received. Once the switch off request is received, the lamp power is abruptly reduced in step 101 to an undershoot power level of 10% of nominal power (which in this example is a level of 12W). In step 102, the lamp is driven at the und...

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Abstract

The invention describes a method of shutting down a high pressure discharge lamp (1) in which a pair of electrodes (2) is disposed in an arc tube (3), which method comprises reducing, upon receipt of a shut-down request (SR), the lamp power (P) towards a reduced power level (PR) required to sustain a long-term arc discharge between the electrodes (2), and driving the lamp (1) towards the reduced power level (PR) for a reduced power duration before completely shutting down the lamp power (P), whereby, prior to reducing the lamp power (P) towards the reduced power level (PR), the lamp power (P)is reduced to an undershoot power level (Pu), which undershoot power level (Pu) is lower than the reduced power level (PR) required to sustain a long- term arc discharge between the electrodes (2), and the lamp is driven at this undershoot power level (Pu) for an undershoot power duration (tu) before increasing the lamp power (P) again to approach the reduced power level (PR). Moreover the invention describes an appropriate driving unit (4) for driving a high pressure discharge lamp (1) and an image rendering system (40), particularly a projector system, comprising such a driving unit (4).

Description

technical field [0001] The invention relates to a method for switching off a high-pressure discharge lamp, in particular a mercury vapor discharge lamp. Furthermore, the invention relates to a driver unit for driving a high-pressure discharge lamp. Furthermore, the invention relates to an image presentation system, in particular a projector system, comprising a high pressure discharge lamp and said drive unit. Background technique [0002] High-pressure discharge lamps, such as mercury vapor discharge lamps, comprise an envelope made of a material that is resistant to high temperatures, such as quartz glass. Electrodes made of tungsten protrude into the housing from opposite sides. The outer envelope, also referred to below as “arc tube”, contains a filling of one or more noble gases, in the case of mercury vapor discharge lamps mainly mercury. By applying a high ignition voltage across the electrodes, a light arc is generated between the tips of the electrodes. Once the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B41/292
CPCH05B41/2928Y02B20/206H05B41/384H04N9/3144H04N9/3155Y02B20/00
Inventor T·G·托尔L·V·M·施里尔C·德佩
Owner KONINK PHILIPS ELECTRONICS NV
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