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Method and circuit for improving crest factor in gas discharge lamp

A gas discharge lamp and wave crest factor technology, which is applied to electric light sources, electrical components, lighting devices, etc., can solve the problems of gas discharge lamp electrode damage, reduce the service life of gas discharge lamps, etc., and achieve the effect of improving the crest factor and precise control.

Inactive Publication Date: 2016-02-10
DELTA ELECTRONICS (SHANGHAI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] If the value of the crest factor is larger, it means that the peak current is higher, which will easily cause the electrode damage of the gas discharge lamp, thereby reducing the service life of the gas discharge lamp

Method used

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  • Method and circuit for improving crest factor in gas discharge lamp
  • Method and circuit for improving crest factor in gas discharge lamp
  • Method and circuit for improving crest factor in gas discharge lamp

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no. 1 example

[0073] Figure 2A The principle of a first embodiment of the inventive crest factor improved gas discharge lamp circuit is shown. See Figure 2A , The gas discharge lamp circuit in this embodiment includes a power factor correction circuit 20 , a DC / DC converter, an inverter 22 , a judgment signal sampling circuit 24 , a digital processing chip 26 and a control unit 28 .

[0074] The connection relationship of these modules is: the input signal of the judgment signal sampling circuit 24 can be a signal reflecting the state of the lamp, including signals such as the lamp voltage of the gas discharge lamp, the circuit duty cycle or the output voltage of the DC / DC converter, or can be It is a signal that reflects the lamp power, including the lamp power of the gas discharge lamp, the system input power or the system output power, etc. It can also be the counting signal of the counter (the counter also includes a timer) and other signals, or it can be other signals that reflect t...

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Abstract

A method and circuit for improving the crest factor of the gas discharge lamp. The method includes: the signal of the gas discharge lamp can be sampled to get a status signal; whether the present stage of the gas discharge lamp is at warm up stage or constant power stage can be judged based on the result of comparison between the status signal and a preset value; preset parameters can be selected based on the stage of the gas discharge lamp, the first parameter can be selected when the gas discharge lamp is at a warm up stage, and the second parameter can be selected when the gas discharge lamp is at a constant power stage; a control signal can be outputted during the lamp current commutation based on the selected first or second parameter to improve the crest factor of the gas discharge lamp.

Description

technical field [0001] The present invention relates to a technology for improving the crest factor (CF, CrestFactor) in a gas discharge lamp (gasdischargelamp), in particular to improving the crest factor by reducing the peak current of the gas discharge lamp in current commutation (lampcurrent commutation) in the gas discharge lamp methods and circuits. Background technique [0002] figure 1 The principle of a conventional gas discharge lamp is shown. See figure 1 , The traditional gas discharge lamp circuit mainly includes a power factor correction circuit 10 (PFC, PowerFactor Circuit), a DC / DC converter 12 (DC / DC converter), and an inverter 14 (Inverter). The three are connected in sequence, and the output of the inverter 14 is connected to the gas discharge lamp 16 . [0003] Such as figure 1 As shown, the DC / DC converter 12 provides suitable power energy for the gas discharge lamp, and the inverter 14 provides a low frequency (for example, 150 Hz) square wave volt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B41/36
CPCH05B41/2858H05B41/2828
Inventor 张琪张伟强应建平
Owner DELTA ELECTRONICS (SHANGHAI) CO LTD