Method for operating a high-pressure discharge lamp, operating appliance for a high-pressure discharge lamp, and illumination device
A technology for high-pressure discharge lamps and driving equipment is applied in the fields of driving high-pressure discharge lamps and driving equipment and lighting devices for high-pressure discharge lamps, and can solve problems such as inability to distinguish, inability to detect serious flicker, and false detection.
Inactive Publication Date: 2008-01-23
PATENT TREUHAND GESELLSCHAFT FUR ELECTRIC GLUEHLAMPEN MBH
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Problems solved by technology
[0003] A disadvantage of the method and of the drive device is that in this way only severe flickering of the discharge arc, which temporarily extinguishes the discharge arc, can be detected.
With this method and this operating device it is not possible to detect the initial stages of severe flickering, for example flickering of the discharge arc which has not yet been temporarily extinguished but only occurs in relatively small fluctuations of the operating voltage of the high-pressure discharge lamp or of the lamp current
A further disadvantage of the method and the operating device according to the aforementioned patent documents is that in the method and the operating device it is not possible to combine flickering of the discharge arc due to reaching the end of the life of the lamp with shocks or vibrations of the high-pressure discharge lamp. The fluctuations caused by the discharge arc are distinguished between
The drive device according to the aforementioned prior art thus erroneously detects such fluctuations as a defect in the lamp
Method used
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[0026] FIG. 6 shows a block diagram according to a first exemplary embodiment of an operating device for a high-pressure discharge lamp, with the aid of which the inventive operating method for a high-pressure discharge lamp will be described below. The high-pressure discharge lamp is a metal halide high-pressure gas discharge lamp which is used as a light source in motor vehicle headlights and has an electrical power consumption of approximately 35 watts.
[0027] The drive unit is fed from the on-board supply voltage of the motor vehicle. The driving device mainly comprises a full-bridge inverter with a high-pressure discharge lamp connected in a bridge arm, a DC power supply circuit for the full-bridge inverter, and an ignition device (ignition device) for triggering a gas discharge in the high-pressure discharge lamp. Inverter), and a microcontroller for controlling the full-bridge inverter and its DC power supply circuit. Details of the circuit arrangement of such a driv...
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The invention relates to a method for operating a high-pressure discharge lamp having an electrical voltage with a periodically alternating polarity. According to said method, during the operation of the high-pressure discharge lamp, the lamp is monitored for flickering, the occurrence of vibration, and preferably the exceeding of static parameters (e.g. lamp overvoltage) of the high-pressure discharge lamp.
Description
technical field [0001] The invention relates to a method for operating a high-pressure discharge lamp according to the preamble of claim 1 , an operating device having means for carrying out the method, and an illumination device having a high-pressure discharge lamp and an operating device. Background technique [0002] Such a method and a drive device for carrying out such a method are disclosed, for example, in patent document US Pat. No. 5,973,457. This document describes an operating device for a high-pressure discharge lamp having means for detecting the flicker state of the high-pressure discharge lamp. That is, the flickering of the discharge arc of the high-pressure discharge lamp is detected, and when the flickering state repeatedly occurs, if the lamp-off time lasts longer than the predetermined first duration and the lamp-on time is less than or equal to the predetermined second duration , then switch off the high pressure discharge lamp. [0003] A disadvantag...
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IPC IPC(8): H05B41/292
CPCY02B20/208H05B41/2925H05B41/2928Y02B20/00
Inventor M·博尼格克
Owner PATENT TREUHAND GESELLSCHAFT FUR ELECTRIC GLUEHLAMPEN MBH