CN105070240A - Circuit structure used for detecting backlight module - Google Patents
Circuit structure used for detecting backlight module Download PDFInfo
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- CN105070240A CN105070240A CN201510581024.5A CN201510581024A CN105070240A CN 105070240 A CN105070240 A CN 105070240A CN 201510581024 A CN201510581024 A CN 201510581024A CN 105070240 A CN105070240 A CN 105070240A
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Abstract
The invention discloses a circuit structure used for detecting a backlight module. The circuit structure comprises an input end IN, an output end OUT, a silicon controlled rectifier Q1, a triode Q2, a triode Q3, an optical coupler, a capacitor C and a resistor R2, wherein the optical coupler and the resistor R2 are connected in series and then connected with an emitter of the silicon controlled rectifier Q1 and the capacitor C, the capacitor C is respectively connected with a base of the silicon controlled rectifier Q1 and the optical coupler through circuits, a resistor R4 is arranged between the base of the silicon controlled rectifier Q1 and the capacitor C, a collector of the silicon controlled rectifier Q1 is connected with the optical coupler through a circuit, a collector of the triode Q2 is connected with the capacitor C, a base of the triode Q2 is connected with a collector of the triode Q3, a base of the triode Q3 is connected with the optical coupler through a circuit, the base of the triode Q3 is connected with an emitter of the triode Q3 through a resistor R7, and the emitter of each of the silicon controlled rectifier Q1, the triode Q2 and the triode Q3 is connected with the input end IN through circuits. The circuit structure is convenient in detection and can automatically convert current.
Description
Technical field
The present invention relates to a kind of circuit, the circuit structure in tool is tested in specifically a kind of detection for detecting backlight module performance.
Background technology
The electronic product with Presentation Function used at present, if TV, display, digital camera, mobile phone, PDA, portable type DVD etc. are configured by liquid crystal panel to show video-audio signal, and the image display of liquid crystal panel more depends on light source design and the qualitative control of backlight module, backlight module directly can affect the effect of show image and picture contrasts quality, therefore, good backlight module will improve the quality of liquid crystal panel image display.
Along with liquid crystal display usable range is more and more wider, its backlight is also more and more stricter on examination requirements, and in order to ensure generation efficiency, also requires more and more faster to detection thing.Traditional detection mode, first backlight module is driven to detect with low current, and then drive backlight module to detect with normal current, this detection mode needs manual operation, owing to needing different electric currents, needs to arrange a current switch, when detecting with low current, then be allocated to low current direction, in circuit, flow through low current, make backlight module shinny.When needing high current, be then allocated to high current direction, in circuit, flow through high current, make backlight module send out high, thus check whether backlight module exists defective work.Due to needs manual switching switch, cause operating speed comparatively slow, lose time and energy.And part workman, sometimes in order to save time, directly may neglect low current and detecting, thus brings impact to the quality of backlight module.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of circuit structure for detecting backlight module automatically can changing different electric current.
In order to solve the problems of the technologies described above, the present invention takes following technical scheme:
A kind of circuit structure for detecting backlight module, there is input end IN and output terminal OUT, described circuit also comprises controllable silicon Q1, triode Q2, triode Q3, photo-coupler, electric capacity C and resistance R2, be connected with the emitter of controllable silicon Q1 and electric capacity C after photo-coupler and resistance R2 are connected in series, electric capacity C by circuit respectively with the base stage of controllable silicon Q1, photo-coupler connects, resistance R4 is also provided with between the base stage of controllable silicon Q1 and electric capacity C, the collector of controllable silicon Q1 is connected with photo-coupler by circuit, the collector of triode Q2 is connected with electric capacity C, the base stage of triode Q2 is connected with the collector of triode Q3, the base stage of triode Q3 by connection to photo-coupler, the base stage of triode Q3 is connected with the emitter of this triode Q3 by resistance R7, controllable silicon Q1, triode Q2 is all connected with input end IN by circuit with the emitter of triode Q3, photo-coupler is connected with output terminal OUT by circuit, input end IN by circuit also with the base stage of triode Q2, the collector of triode Q3 connects.
The resistance of described resistance R2 is 560 ohm.
The base stage of described controllable silicon Q1 is connected with the emitter of this controllable silicon Q1 by resistance R3.
Resistance R1 is provided with between described electric capacity C and photo-coupler.
Be provided with resistance R5 between the base stage of described triode Q3 and photo-coupler, this resistance R5 and resistance R1 is connected in parallel.
The resistance of described resistance R1 is preferably 47K ohm, and the resistance of resistance R5 is preferably 100K ohm.
The resistance of described resistance R3 is preferably 47K ohm, and the resistance of resistance R4 is preferably 4.7K ohm, and the resistance of resistance R7 and resistance R6 is all preferably 100K ohm.
Circuit application of the present invention, in a kind of detecting tool, for detecting backlight module, connects backlight module, automatically gearshift can be changed between reduced-current and normal current, do not need artificial toggle switch to change, effectively improve operating efficiency, reduce working strength.
Accompanying drawing explanation
Accompanying drawing 1 is circuit theory schematic diagram of the present invention.
Embodiment
For the ease of the understanding of those skilled in the art, below in conjunction with accompanying drawing, the invention will be further described.
As shown in Figure 1, present invention is disclosed a kind of circuit structure for detecting backlight module, there is input end IN and output terminal OUT, described circuit also comprises controllable silicon Q1, triode Q2, triode Q3, photo-coupler 3, electric capacity C and resistance R2, be connected with the emitter of controllable silicon Q1 and electric capacity C after photo-coupler 3 and resistance R2 are connected in series, electric capacity C by circuit respectively with the base stage of controllable silicon Q1, photo-coupler connects, resistance R4 is also provided with between the base stage of controllable silicon Q1 and electric capacity C, the collector of controllable silicon Q1 is connected with photo-coupler by circuit, the collector of triode Q2 is connected with electric capacity C, the base stage of triode Q2 is connected with the collector of triode Q3, the base stage of triode Q3 by connection to photo-coupler, the base stage of triode Q3 is connected with the emitter of this triode Q3 by resistance R7, controllable silicon Q1, triode Q2 is all connected with input end IN by circuit with the emitter of triode Q3, photo-coupler is connected with output terminal OUT by circuit, input end IN by circuit also with the base stage of triode Q2, the collector of triode Q3 connects.Namely one end of electric capacity C, controllable silicon Q1 emitter, triode Q2 emitter, triode Q3 emitter are connected with input end IN by circuit after connecting mutually again.Photo-coupler is used for when putting into conducting when backlight module has backlight.
In addition, be provided with resistance R5 between the base stage of triode Q3 and photo-coupler, this resistance R5 and resistance R1 is connected in parallel.The base stage of controllable silicon Q1 is connected with the emitter of this controllable silicon Q1 by resistance R3.In addition, the resistance of resistance R2 is preferably 560 ohm.The resistance of resistance R1 is preferably 47K ohm, and the resistance of resistance R5 is preferably 100K ohm.The resistance of resistance R3 is preferably 47K ohm, and the resistance of resistance R4 is preferably 4.7K ohm, and the resistance of resistance R7 and resistance R6 is all preferably 100K ohm.
After having backlight to be linked into output terminal OUT end points when one, just have electric current from 2 pin of OUT end points through photo-coupler flow through resistance R2 to power supply negative pole (due to resistance R2 dividing potential drop now backlight logical be small electric stream).
The input end of photo-coupler when have electric current by time output terminal will conducting, just have voltage above such resistance R5 and resistance R1. be then divided into two-way, resistance R1 mono-road charge function, resistance R5 mono-road discharging function.
For charging: have voltage due to above at this moment resistance R1, will charging slowly on electric capacity C.The voltage being added in resistance R4 after electric capacity C is charged to certain hour will conducting controllable silicon Q1, controllable silicon Q1 mono-conducting just direct the 2nd pin by output terminal OUT is received on negative pole, as long as at this moment backlight just have passed normal voltage. and backlight is not taken away, and controllable silicon Q1 can conducting always.
For electric discharge: when not having backlight to access, owing to being that resistance R6 connects in circuit always, triode Q2 is conducting when not having backlight to access, and is bled off by the voltage on electric capacity C like this by triode Q2, for the access of backlight is next time prepared.And when there being backlight to access in order to the at this moment triode Q2 that normally works requires to be cut off, this function has been come by triode Q3, said before when there being backlight to access that resistance R5 also had voltage, triode Q2 will also can end by such triode Q3 simultaneously in conducting, electric capacity can regularly be charged, completes Delayed conducting silicon controlled object.
Claims (7)
1. one kind for detecting the circuit structure of backlight module, there is input end IN and output terminal OUT, it is characterized in that, described circuit also comprises controllable silicon Q1, triode Q2, triode Q3, photo-coupler, electric capacity C and resistance R2, be connected with the emitter of controllable silicon Q1 and electric capacity C after photo-coupler and resistance R2 are connected in series, electric capacity C by circuit respectively with the base stage of controllable silicon Q1, photo-coupler connects, resistance R4 is also provided with between the base stage of controllable silicon Q1 and electric capacity C, the collector of controllable silicon Q1 is connected with photo-coupler by circuit, the collector of triode Q2 is connected with electric capacity C, the base stage of triode Q2 is connected with the collector of triode Q3, the base stage of triode Q3 by connection to photo-coupler, the base stage of triode Q3 is connected with the emitter of this triode Q3 by resistance R7, controllable silicon Q1, triode Q2 is all connected with input end IN by circuit with the emitter of triode Q3, photo-coupler is connected with output terminal OUT by circuit, input end IN by circuit also with the base stage of triode Q2, the collector of triode Q3 connects.
2. the circuit structure for detecting backlight module according to claim 1, is characterized in that, the resistance of described resistance R2 is 560 ohm.
3. the circuit structure for detecting backlight module according to claim 2, is characterized in that, the base stage of described controllable silicon Q1 is connected with the emitter of this controllable silicon Q1 by resistance R3.
4. the circuit structure for detecting backlight module according to claim 3, is characterized in that, is provided with resistance R1 between described electric capacity C and photo-coupler.
5. the circuit structure for detecting backlight module according to claim 4, is characterized in that, is provided with resistance R5 between the base stage of described triode Q3 and photo-coupler, and this resistance R5 and resistance R1 is connected in parallel.
6. the circuit structure for detecting backlight module according to claim 5, is characterized in that, the resistance of described resistance R1 is preferably 47K ohm, and the resistance of resistance R5 is preferably 100K ohm.
7. the circuit structure for detecting backlight module according to claim 6, is characterized in that, the resistance of described resistance R3 is preferably 47K ohm, and the resistance of resistance R4 is preferably 4.7K ohm, and the resistance of resistance R7 and resistance R6 is all preferably 100K ohm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510581024.5A CN105070240A (en) | 2015-09-14 | 2015-09-14 | Circuit structure used for detecting backlight module |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510581024.5A CN105070240A (en) | 2015-09-14 | 2015-09-14 | Circuit structure used for detecting backlight module |
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| CN105070240A true CN105070240A (en) | 2015-11-18 |
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| CN201510581024.5A Pending CN105070240A (en) | 2015-09-14 | 2015-09-14 | Circuit structure used for detecting backlight module |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104111397A (en) * | 2013-04-18 | 2014-10-22 | 深圳市海洋王照明工程有限公司 | Power interruption detection circuit and lamp |
| JP2015087209A (en) * | 2013-10-30 | 2015-05-07 | 富士通テレコムネットワークス株式会社 | Performance evaluation method of electric protection barrier, and performance evaluation system |
| JP2015121418A (en) * | 2013-12-20 | 2015-07-02 | 株式会社デンソー | Abnormality detection device for electric load driving apparatus |
| CN104795025A (en) * | 2015-04-29 | 2015-07-22 | 西安诺瓦电子科技有限公司 | LED display module and method for detecting states thereof |
| CN205028626U (en) * | 2015-09-14 | 2016-02-10 | 东莞市亚通光电有限公司 | A circuit structure for detecting backlight unit |
-
2015
- 2015-09-14 CN CN201510581024.5A patent/CN105070240A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104111397A (en) * | 2013-04-18 | 2014-10-22 | 深圳市海洋王照明工程有限公司 | Power interruption detection circuit and lamp |
| JP2015087209A (en) * | 2013-10-30 | 2015-05-07 | 富士通テレコムネットワークス株式会社 | Performance evaluation method of electric protection barrier, and performance evaluation system |
| JP2015121418A (en) * | 2013-12-20 | 2015-07-02 | 株式会社デンソー | Abnormality detection device for electric load driving apparatus |
| CN104795025A (en) * | 2015-04-29 | 2015-07-22 | 西安诺瓦电子科技有限公司 | LED display module and method for detecting states thereof |
| CN205028626U (en) * | 2015-09-14 | 2016-02-10 | 东莞市亚通光电有限公司 | A circuit structure for detecting backlight unit |
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