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Discharge lamp drive device

A technology for driving devices and discharge lamps, applied in lighting devices, electric light sources, electrical components, etc., can solve the problems of large stray currents and large influence of current feedback signal errors, and achieve the reduction of stray currents and accurate current feedback signals Effect

Inactive Publication Date: 2011-03-23
HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the entire discharge lamp driving device, the stray currents generated by the capacitors C11, C12 and C13 are relatively large, and therefore have a great influence on the error of the current feedback signal

Method used

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Examples

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Embodiment Construction

[0012] figure 2 It is a discharge lamp driving device according to an embodiment of the present invention. The discharge lamp driving device includes a power conversion circuit 21 , a transformer resonant circuit 22 , a resonant circuit 23 , a feedback circuit 24 , a PWM controller 25 and a discharge lamp L2.

[0013] The power conversion circuit 21 is used to convert the received signal into an AC signal, and the AC signal is a square wave signal.

[0014] The transformer resonant circuit 22 is connected to the power conversion circuit 21 for boosting the AC signal, which includes a transformer T2 and a capacitor C21. The transformer T2 has a primary winding and a secondary winding. The capacitor C21 is connected between the high-voltage end and the low-voltage end of the secondary winding of the transformer T2, and it can resonate with the leakage inductance of the transformer T2.

[0015] The resonant circuit 23 is connected to the transformer resonant circuit 22, namely ...

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PUM

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Abstract

The drive device for discharge lamp comprises: a power conversion circuit conversing received signal into ac signal, a transformation resonant circuit including a transformer and a capacitor for boosting up the ac signal, and a PWM controller for controlling ac signal, wherein the capacitor connects between the high and low voltage ends of secondary side of the transformer. This invention reducesstray current, and provides precise feedback signal.

Description

【Technical field】 [0001] The present invention relates to a discharge lamp driving device, in particular to a discharge lamp driving device applied to a liquid crystal display (liquid crystal display, LCD) backlight source module. 【Background technique】 [0002] At present, the panel of the liquid crystal display (LCD) mainly uses a discharge lamp (Discharge Lamp) as a backlight source, and the discharge lamp requires a relatively high driving voltage to be turned on. In order to ensure the normal operation of the discharge lamp and maintain the current passing through it at a constant value, a feedback circuit is generally required to feed back the current flowing through the discharge lamp, so as to determine the working state of the discharge lamp. [0003] figure 1 Shown is a conventional discharge lamp driving device, which includes a power conversion circuit 11, a voltage transformer resonant circuit 12, a resonant circuit 13, a feedback circuit 14, a PWM controller 1...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B41/14H05B41/26
Inventor 葛炽昌王克文
Owner HONG FU JIN PRECISION IND (SHENZHEN) CO LTD