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Electric voltage detecting circuit and electric discharge lamp driven apparatus using same

A voltage detection and driving device technology, applied in the direction of instruments, static indicators, etc., can solve the problems of susceptibility to interference, high circuit impedance, etc., and achieve the effect of not being easily disturbed by noise and low output impedance

Inactive Publication Date: 2009-08-19
HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the circuit impedance of this architecture is high and susceptible to interference

Method used

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  • Electric voltage detecting circuit and electric discharge lamp driven apparatus using same
  • Electric voltage detecting circuit and electric discharge lamp driven apparatus using same
  • Electric voltage detecting circuit and electric discharge lamp driven apparatus using same

Examples

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Embodiment Construction

[0015] image 3 Shown is a functional block diagram of the discharge lamp driving device 20 of the present invention. The discharge lamp driving device 20 is used to drive the lamp tube group 240, wherein the lamp tube group 240 includes a plurality of discharge lamps. In this embodiment, the discharge lamp driving device 20 includes a driving switch circuit 200 , a transformer resonance circuit 210 , a protection circuit 220 and a voltage detection circuit 230 . The driving switch circuit 200 is used to convert the input DC signal into an AC signal, and output the AC signal. In this embodiment, the AC signal output by the driving switch circuit 200 is a square wave signal. The transformer resonant circuit 210 is connected with the driving switch circuit 200 for converting the AC signal output by the driving switch circuit 200 into another AC signal and outputting it to the lamp group 240 to drive the lamp group 240 . Wherein, another AC signal is a sine wave signal. The v...

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Abstract

A discharge lamp driving device is used for driving a discharge lamp, which includes a drive switch circuit, a voltage-transforming resonant circuit and a voltage detection circuit. The drive switch circuit is used to convert the input DC signal into an AC signal. The variable voltage resonant circuit is connected with the driving switch circuit, and is used for converting the AC signal into another AC signal to drive the discharge lamp. The voltage detecting circuit is connected between the variable voltage resonant circuit and the discharge lamp, and includes multiple voltage dividing circuits and reverse charging circuits. The voltage divider circuit is connected to the discharge lamps in a one-to-one correspondence, and is used for dividing the voltage loaded on the discharge lamps. Moreover, the voltage dividing circuits are respectively connected to the reverse charging circuits, and the reverse charging circuits charge each other to increase the DC level of the divided voltage. In the voltage detection circuit of the present invention, the voltage dividing circuits charge each other through the reverse charging circuit to increase the DC level of the divided voltage signal, so as to accurately detect whether the discharge lamp is abnormal.

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] A liquid crystal display (Liquid Crystal Display, LCD) panel uses a discharge lamp (Discharge Lamp), especially a cold cathode fluorescent lamp (Cold Cathode Fluorescent Lamp, CCFL) as a light source for a backlight (Backlight) system. Typically, the CCFL is driven by an inverter circuit (Inverter Circuit), which can supply an AC signal to the discharge lamp. When the voltage of the AC signal output by the inverter circuit is too high, it will cause damage to the discharge lamp, or even burn the discharge lamp. When the voltage of the AC signal output by the inverter circuit is too low, the discharge lamp cannot be started. Therefore, it is necessary to add a voltage detection circuit and a protection circuit in the co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/34G09G3/36G09G3/20G02F1/133
Inventor 葛炽昌张志彰甘吉文
Owner HONG FU JIN PRECISION IND (SHENZHEN) CO LTD
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