Unlock instant, AI-driven research and patent intelligence for your innovation.

Circuit arrangement for operating discharge lamps and method for operating discharge lamps

A circuit device and technology for discharge lamps are applied in the field of circuit devices of high-pressure discharge lamps and ultra-high-pressure discharge lamps, and can solve problems such as damage to electrodes, melting, etc.

Active Publication Date: 2010-03-31
OSRAM GMBH
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, melting of both electrodes can damage electrodes with only one electrode tip
Although this one electrode did not cause flickering, it may be molten

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Circuit arrangement for operating discharge lamps and method for operating discharge lamps
  • Circuit arrangement for operating discharge lamps and method for operating discharge lamps
  • Circuit arrangement for operating discharge lamps and method for operating discharge lamps

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0035] figure 1 A circuit arrangement is shown for operating a high-pressure discharge lamp, as its topology is known from the prior art. The electronic switches S1, S2, S3 and S4 are connected between the positive pole and the negative pole of the DC source Q to form a full bridge circuit. The direct current source is usually formed by a step-down converter (buck converter), which obtains its energy, for example, from the mains voltage. In the bridge branch between the nodes A1 and A2 a lamp EL is connected. The coil L of the ignition transformer is connected in series with the lamp EL, and the ignition device Z couples a voltage into the ignition transformer, which is used to ignite the lamp. The ignition means are not critical to the invention.

[0036] The full bridge circuit forms a commutation device. The potentials of the upper and lower parts of the full bridge circuit, which are connected to the positive and negative poles of the DC source Q, form the input of the...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

When operating high-pressure discharge lamps, flickering occurs with the excessive formation of electrode tips. With the help of the invention, it is possible to detect the electrode having multiple electrode tips. In this way, interfering electrode tips can be specifically melted off.

Description

technical field [0001] The invention relates to a circuit arrangement for operating discharge lamps, in particular high-pressure discharge lamps and very high-pressure discharge lamps, which are used, for example, in devices for projecting images by means of alternating current. The present invention is concerned with the problem of flicker phenomena which are caused by disturbance of the arc of a discharge lamp after a polarity reversal of the lamp current. In particular, the invention relates to the problems associated with the recognition of electrode changes of discharge lamps. Background technique [0002] During operation of a discharge lamp (hereinafter also simply referred to as lamp), there is a phenomenon of electrode tip growth. The material evaporated from the electrode at one location is deposited on the electrode again at a preferred location and leads to the formation of an electrode tip. The electrode tip now has the advantage that the plasma arc of the arc...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H05B41/288
CPCY02B20/208Y02B20/202H05B41/2928H05B41/2888Y02B20/00
Inventor 克里斯蒂安·布罗伊尔马丁·布吕克尔伯恩哈德·赖特尔安德烈亚斯·胡贝尔
Owner OSRAM GMBH