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Lamp tube current feedback and open circuit protection circuit

A technology of current feedback and open-circuit protection, which is applied to the use of electric light sources, electrical components, and gas discharge lamps, etc., can solve the problems of lamp current feedback and open-circuit protection circuit structure, high cost, etc., and achieve low cost and simple circuit structure Effect

Inactive Publication Date: 2008-01-09
INNOCOM TECH SHENZHEN +1
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0012] In order to solve the problem of complex structure and high cost of lamp current feedback and open circuit protection circuit in the prior art, the present invention provides a lamp tube current feedback and open circuit protection circuit with simple structure and low cost

Method used

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  • Lamp tube current feedback and open circuit protection circuit
  • Lamp tube current feedback and open circuit protection circuit
  • Lamp tube current feedback and open circuit protection circuit

Examples

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Embodiment Construction

[0021] Please refer to FIG. 2 , which is a schematic diagram of the lamp current feedback and open circuit protection circuit of the present invention. For convenience of description, the case of four backlight lamps is taken as an example for illustration. The lamp current feedback and open circuit protection circuit 2 includes a first detection circuit 21 , a second detection circuit 22 , a first input circuit 24 , a second input circuit 25 and a PWM integrated circuit 26 .

[0022] The first detection circuit 21 includes a first backlight tube 211, a second backlight tube 212 and a first detection output terminal 210, and the second detection circuit 22 includes a third backlight tube 221, a fourth backlight The light tube 222 and a second detection output terminal 220 . The backlight tube is a cold cathode ray tube or a light emitting diode.

[0023] The PWM integrated circuit 26 includes a current sampling terminal 261. When the current sampling terminal 261 is pulled t...

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Abstract

The circuit comprises at least one detection circuit, at least one input circuit and a pulse width modulation IC. Each detection circuit comprises two backlight luminous tubes and a detection output end; when any backlight luminous tube turns on, the detection output end outputs a low voltage signal, and said pulse width modulation IC stops working. Each input circuit comprises a resistor and a diode; the resistor is parallel-connected to the diode; the anode of the diode is connected to the current sampling end of the pulse width modulation IC; the cathode of the diode is taken as the input end of the input circuit; the detection output end of each detection circuit is connected to the input end of an input circuit.

Description

technical field [0001] The invention relates to a lamp current feedback and open circuit protection circuit, in particular to a lamp current feedback and open circuit protection circuit for a liquid crystal display device. Background technique [0002] Liquid crystal display devices have the advantages of lightness, thinness, and low power consumption, and are therefore widely used in modern information equipment such as televisions, notebook computers, mobile phones, and personal digital assistants. Since the liquid crystal molecules in the liquid crystal display device do not emit light themselves, the liquid crystal display device needs to use a backlight module to emit light to realize image display. Usually, the backlight module includes a plurality of backlight lamps and a device to adjust the operating current of the plurality of backlight lamps. When the backlight tube works normally, a feedback circuit is needed to feed back the current of the backlight tube to the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B41/282H05B41/292
CPCY02B20/208Y02B20/183Y02B20/00
Inventor 鲁建辉周通周和康
Owner INNOCOM TECH SHENZHEN
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