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Circuit arrangement for operating a low-pressure gas discharge lamp and corresponding method

A low-pressure gas and circuit device technology, applied in the field of driving low-pressure gas discharge lamps

Inactive Publication Date: 2010-11-17
OSRAM GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This document deals with the problem of protecting persons against electrical shock from a lead-ground reference potential and coming into contact with gas discharge lamps

Method used

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  • Circuit arrangement for operating a low-pressure gas discharge lamp and corresponding method
  • Circuit arrangement for operating a low-pressure gas discharge lamp and corresponding method

Examples

Experimental program
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Effect test

Embodiment Construction

[0023] The circuit arrangement 1 shown in this figure comprises an input 2 which has a first input connection and a second input connection 3 , 4 . Supply DC voltage U is available at input 2 G , that is to say the supply DC voltage is supplied from the AC voltage of the supply network by means of the grid part. An intermediate circuit capacitor 5 is connected in parallel to the input 2 , at which DC supply voltage U is present. G .

[0024] An inverter 6 comprising a first electrical switch 7 and a second electrical switch 8 is connected in parallel to the input 2 and the intermediate circuit capacitor 5 . The inverter 6 is used to provide the supply AC voltage U V , the supply AC voltage generally has a frequency significantly greater than the frequency of the grid voltage.

[0025] For driving the inverter 6, a control device 9 is provided, which can regulate the AC supply voltage U V frequency, ie by correspondingly exciting the inverter 6.

[0026] The control devic...

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PUM

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Abstract

A circuit arrangement is provided, which may include an inverter, configured to provide an AC supply voltage from a DC supply voltage; a control device configured to drive the inverter, the control device being configured to initiate a preheating phase once a preheating criterion has been met; a resonant circuit having a resonant inductor and having a resonant capacitor; and a transformer configured to preheat electrodes of a gas discharge lamp; wherein the primary winding of the transformer is connected in series with the resonant capacitor and is connected directly to the reference potential of the control device, and an electrical switch is coupled in parallel with the primary winding of the transformer, which switch has a control connection, which is coupled to the control device being configured to transfer the electrical switch into its electrically conducting switching state once the starting criterion has been met.

Description

technical field [0001] The invention relates to a circuit arrangement for operating at least one low-pressure gas discharge lamp, which has an input with a first input terminal and a second input terminal for applying a supply DC voltage; an output with the output having a first pair of output terminals and a second pair of output terminals for connecting at least one low-pressure gas discharge lamp; an inverter coupled to the first input terminal and the second input terminal for providing a supply AC voltage from the supply DC voltage; A control device for energizing the inverter and thus for controlling the frequency of the supply AC voltage, wherein the control device is designed to start a preheating phase in which the inverter is preheated with Thermal frequency to drive, and the control device is designed to adjust the frequency of the supply AC voltage to the ignition frequency after meeting the predetermined ignition criteria; a resonant circuit, the resonance circuit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B41/295
CPCH05B41/295
Inventor 贝恩德·鲁道夫
Owner OSRAM GMBH
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