CN203606463U - Automatic detection device for LED array - Google Patents
Automatic detection device for LED array Download PDFInfo
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- CN203606463U CN203606463U CN201320732817.9U CN201320732817U CN203606463U CN 203606463 U CN203606463 U CN 203606463U CN 201320732817 U CN201320732817 U CN 201320732817U CN 203606463 U CN203606463 U CN 203606463U
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- 238000001514 detection method Methods 0.000 title claims abstract description 44
- 238000004891 communication Methods 0.000 claims abstract description 4
- 238000012360 testing method Methods 0.000 claims description 29
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- 239000003990 capacitor Substances 0.000 claims description 10
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- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000003491 array Methods 0.000 abstract 1
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- 206010070834 Sensitisation Diseases 0.000 description 1
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- 239000008358 core component Substances 0.000 description 1
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Abstract
The utility model discloses an automatic detection device for an LED array. The LED array comprises at least two LED lamps. The automatic detection device comprises a plurality of detection circuits which sense the lighting intensities of the LED lamp in an one-to-one corresponding manner and convert the lightening intensities into output voltages; a micro controller which is connected with the detection circuits, wherein the micro controller is provided with a plurality of analogue/digital converters which convert the output voltage into digital values, and each analogue/digital converter is connected with a detection circuit; a PC which carries out UART communication connection with the micro controller and receives detection results from the micro controller; and a PC display which is connected with the PC and displays the detection result. The automatic detection device is simple in structure, low in error rate, high in detection efficiency, capable of achieving full automatic detection for LED, and especially suitable for detection for large color LED arrays and online detection in LED production.
Description
Technical field
The utility model relates to a kind of pick-up unit, and particularly a kind of automatic detection device of LED array, belongs to electronic technology field.
Background technology
Light emitting diode (LED, Light Emitting Diode) belongs to semiconductor devices, can directly electric energy be converted to luminous energy, and it is being applied in field widely.In the practical application of LED, tend to occur being provided with on a display panels situation of a lot of LED lamps, close and numerous the coming of multiple LED lamps forms an array together simultaneously.Whether this LED array will detect each LED lamp after assembling can light normal work, similarly, when after display board work certain hour, part LED lamp cisco unity malfunction also can occur and the problem of needs detection examination.After tested LED array is lighted, if adopt manual method to detect, because the light of all LED lamps mixes, make people dazzled, be difficult to find out the particular location of trouble light, especially when LED array is while being made up of the LED lamp of different colours, just more difficult other trouble light that finds.Therefore manual detection LED array has the shortcoming that workload is large, error rate is high and work efficiency is low.
Utility model content
Technical problem to be solved in the utility model is, overcome the deficiencies in the prior art, a kind of automatic detection device of LED array is provided, it can complete the detection of fault LED lamp in LED array automatically, and on PC, show result, especially be of value to the detection of color LED lamp, reach the effect that improves detection efficiency, reduces detection error rate.
The utility model solves the technical scheme that its technical matters adopts:
An automatic detection device for LED array, described LED array is made up of at least 2 LED lamps; Described automatic detection device includes:
Respond to correspondingly the intensity of illumination of described LED lamp and this intensity of illumination is converted into some testing circuits of output voltage;
With the microcontroller that all testing circuits are connected, this microcontroller can be converted to described output voltage the analog to digital converter of digital value with multichannel, and each analog to digital converter connects a testing circuit;
PC with described microcontroller carries out UART communication connection, receives the testing result from microcontroller;
The PC display that is connected and shows test results with described PC.
As further improvement, described testing circuit comprises: accept the photodiode of the illumination of LED lamp, in reverse-bias state, the intensity of illumination of its inverse current and described LED lamp is proportionate, and intensity of illumination is stronger, and inverse current is larger; The operational amplifier that input end is connected with described photodiode, its output terminal is connected with described analog to digital converter; Be cascaded and receive the resistance R 3 on 10V power supply with described photodiode, the inverse current on photodiode is changed into the pressure drop in this resistance R 3, offer described operational amplifier and process; Be connected in resistance R 1 and the resistance R 2 of the output terminal of described operational amplifier, the Voltage Feedback of operational amplifier input end formed to output voltage to output terminal, and deliver to described microcontroller and detect; Be connected in decoupling capacitor C3 on the output terminal of described operational amplifier, be connected in decoupling capacitor C1 and decoupling capacitor C2 on described 10V power supply, disturb for filtering clutter.
As further improvement, accept the wavelength coverage of the corresponding LED lamp of sensitive range that the photodiode of described LED light photograph responds to.
As further improvement, described photodiode is SFH229FA, and described operational amplifier is LMV358.
Compared with prior art, the utility model detects the state of each LED lamp in LED array by the variation of output voltage, circuit structure is very simple, if the curent change of direct-detection LED lamp under on and off two states needs very complicated circuit structure to realize.In addition, for the situation of the LED lamp (being spectral wavelength difference) of different colours in LED array, the utility model is selected more sensitive photodiode in its corresponding LED lamp wavelength coverage, thereby has improved the accuracy detecting.Meanwhile, the illumination signal that the utility model adopts microcontroller and PC to detect photodiode is processed, and the full-automatic detection and the result that have realized LED array show, with respect to manual detection, have improved detection efficiency, have reduced error rate.
The utility model is not only suitable for the detection of fragmentary LED lamp, and is applicable to the detection of LED array, is particularly useful for the detection of large colour LED array and the online detection of production.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Fig. 2 is the schematic diagram of the utility model testing circuit.
Embodiment
The utility model provides a kind of pick-up unit of can simple and convenient automatic detection LED lamp whether lighting, according to LED lamp, the curent change under on and off two states changes output voltage for it, change by detecting output voltage the state of automatically determining LED lamp, finally on display, show result.
Below in conjunction with drawings and Examples, the utility model is described in further detail, but can not limits protection domain of the present utility model with this.
First refer to Fig. 1 structural representation of the present utility model, the automatic detection device of diagram LED array can either detect fragmentary LED lamp, also can detect LED array, and this LED array is made up of at least 2 LED lamps.
Described automatic detection device includes: some (N, N >=2) testing circuit 01, microcontroller 02, PC03 and PC display 04.
Described testing circuit 01 is responded to the intensity of illumination of described LED lamp correspondingly, and this intensity of illumination is converted into the output voltage of this testing circuit 01, and the quantity of described testing circuit 01 is identical with the LED lamp quantity in described LED array.Described microcontroller 02(MCU, Micro Control Unit) be connected with all testing circuits 01, process with the output voltage that 01 transmission comes to testing circuit; This microcontroller 02 is with multichannel analog to digital converter (ADC, Analog-Digital Converter), and each analog to digital converter connects a testing circuit 01, and this analog to digital converter can be converted to digital value by the output voltage of described testing circuit 01.Described PC03 and described microcontroller 02 carry out UART communication connection, to receive the testing result from microcontroller 02.Described PC display 04 is connected and shows test results with described PC03.
As shown in Figure 2, it comprises photodiode (Photo Diode) D1, operational amplifier U1, resistance R 1, R2 and R3 and decoupling capacitor C1, C2 and C3 to the circuit structure of described testing circuit 01.
Described photodiode D1 can sensitization, and for accepting the illumination of LED lamp on tested LED array, this LED light, according to doing shading treatment, avoids being subject to the interference of other light sources except tested LED lamp; This photodiode D1 is in reverse-bias state, its inverse current and external light intensity, as the intensity of illumination of LED lamp is proportionate: intensity of illumination is stronger, inverse current is larger, in the time that exterior flat is shone, the electric current of the D1 that flows through is very little, is equivalent to open circuit, in the time having illumination, the circuit of the D1 that flows through can increase doubly a lot.The present embodiment adopts the SFH229FA of Siemens, and in the time that outside illumination is almost nil, its inverse current is in 50pA left and right, and in the time that exterior light photograph is brighter, its inverse current can reach 20uA, and therefore the variation of this inverse current has reflected whether tested LED lamp is lighted.
Described operational amplifier U1 is the core component of this testing circuit 01, adopts LMV358 herein, and its input end is connected with described photodiode D1, and its output terminal is connected with the analog to digital converter (ADC1) of described microcontroller 02.
Described resistance R 3 is 68K, is cascaded and receives on 10V power supply with photodiode D1, for the inverse current on photodiode D1 is changed into the pressure drop in resistance R 3, offers operational amplifier U1 and processes; Described resistance R 1(10K) and resistance R 2(22K) be connected in the output terminal of described operational amplifier U1, form a resistor network, be used for the Voltage Feedback of operational amplifier U1 input end to output terminal, form the output voltage of operational amplifier U1, and the ADC mouth of delivering to microcontroller 02 detects.
Described decoupling capacitor C3 is connected on the output terminal of described operational amplifier U1, and described decoupling capacitor C1 and decoupling capacitor C2 are connected on described 10V power supply, and they are for some noise jamming of filtering.
Described testing circuit 01 is by emulation, and when on D1, inverse current is 50pA (tested LED lamp is not bright), on ADC1, output voltage is similar to 0V; When on D1, inverse current is 20uA (tested LED lamp is lighted), whether the about 4.4V of output voltage on ADC1, be therefore easy to detect LED by the ADC mouth of MCU and light.
The utility model, for the situation of the LED lamp (being spectral wavelength difference) of different colours, is selected more sensitive corresponding photodiode in this LED lamp wavelength coverage; On LED array, multiple LED lamps can be detected by different testing circuit 01 respectively, form ADC level, deliver on multiple ADC mouths of MCU, and MCU carries out UART with PC and communicates by letter, and testing result is informed to PC, and PC shows test results on display.
The foregoing is only preferred embodiment of the present utility model, not in order to limit the utility model, all within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection domain of the present utility model.
The utility model is simple in structure, error rate is low, detection efficiency is high, has realized the full-automatic detection of LED, is particularly useful for the detection of large colour LED array and the online detection that LED produces.
Claims (4)
1. an automatic detection device for LED array, described LED array is made up of at least 2 LED lamps; It is characterized in that, described automatic detection device includes:
Respond to correspondingly the intensity of illumination of described LED lamp and this intensity of illumination is converted into some testing circuits of output voltage;
With the microcontroller that all testing circuits are connected, this microcontroller can be converted to described output voltage the analog to digital converter of digital value with multichannel, and each analog to digital converter connects a testing circuit;
PC with described microcontroller carries out UART communication connection, receives the testing result from microcontroller;
The PC display that is connected and shows test results with described PC.
2. the automatic detection device of LED array according to claim 1, is characterized in that, described testing circuit comprises:
Accept the photodiode of the illumination of LED lamp, in reverse-bias state, the intensity of illumination of its inverse current and described LED lamp is proportionate, and intensity of illumination is stronger, and inverse current is larger;
The operational amplifier that input end is connected with described photodiode, its output terminal is connected with described analog to digital converter;
Be cascaded and receive the resistance R 3 on 10V power supply with described photodiode, the inverse current on photodiode is changed into the pressure drop in this resistance R 3, offer described operational amplifier and process;
Be connected in resistance R 1 and the resistance R 2 of the output terminal of described operational amplifier, the Voltage Feedback of operational amplifier input end formed to output voltage to output terminal, and deliver to described microcontroller and detect;
Be connected in decoupling capacitor C3 on the output terminal of described operational amplifier, be connected in decoupling capacitor C1 and decoupling capacitor C2 on described 10V power supply, disturb for filtering clutter.
3. the automatic detection device of LED array according to claim 2, is characterized in that, accepts the wavelength coverage of the corresponding LED lamp of sensitive range that the photodiode of described LED light photograph responds to.
4. the automatic detection device of LED array according to claim 2, is characterized in that, described photodiode is SFH229FA, and described operational amplifier is LMV358.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320732817.9U CN203606463U (en) | 2013-11-19 | 2013-11-19 | Automatic detection device for LED array |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320732817.9U CN203606463U (en) | 2013-11-19 | 2013-11-19 | Automatic detection device for LED array |
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| CN203606463U true CN203606463U (en) | 2014-05-21 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104409453A (en) * | 2014-10-30 | 2015-03-11 | 广东威创视讯科技股份有限公司 | LED packaging structure, LED display system and bad lamp detection method |
| CN105717438A (en) * | 2016-01-29 | 2016-06-29 | 环鸿电子（昆山）有限公司 | Current signal testing device and method |
| CN109212437A (en) * | 2018-09-07 | 2019-01-15 | 南京牧镭激光科技有限公司 | Polychromatic light test method and test equipment |
| CN109541497A (en) * | 2018-11-23 | 2019-03-29 | 深圳佐忠技术有限公司 | A kind of LED lamp panel intelligent detection equipment |
| CN110945637A (en) * | 2017-06-20 | 2020-03-31 | 特索罗科技有限公司 | Light Emitting Diode (LED) testing apparatus and method of manufacture |
-
2013
- 2013-11-19 CN CN201320732817.9U patent/CN203606463U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104409453A (en) * | 2014-10-30 | 2015-03-11 | 广东威创视讯科技股份有限公司 | LED packaging structure, LED display system and bad lamp detection method |
| CN104409453B (en) * | 2014-10-30 | 2017-06-13 | 广东威创视讯科技股份有限公司 | LED encapsulation structure, LED display system and bad lamp detection method |
| CN105717438A (en) * | 2016-01-29 | 2016-06-29 | 环鸿电子（昆山）有限公司 | Current signal testing device and method |
| CN110945637A (en) * | 2017-06-20 | 2020-03-31 | 特索罗科技有限公司 | Light Emitting Diode (LED) testing apparatus and method of manufacture |
| CN110945637B (en) * | 2017-06-20 | 2024-05-17 | 苹果公司 | Light Emitting Diode (LED) testing apparatus and method of manufacture |
| CN109212437A (en) * | 2018-09-07 | 2019-01-15 | 南京牧镭激光科技有限公司 | Polychromatic light test method and test equipment |
| CN109541497A (en) * | 2018-11-23 | 2019-03-29 | 深圳佐忠技术有限公司 | A kind of LED lamp panel intelligent detection equipment |
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Address after: 201821 room 208, building 4, No. 1411, Yecheng Road, Jiading Industrial Zone, Jiading District, Shanghai Patentee after: Botai vehicle networking technology (Shanghai) Co.,Ltd. Address before: 200235 19th floor, Meiluo building, 30 Tianyaoqiao Road, Xuhui District, Shanghai Patentee before: SHANGHAI PATEO ELECTRONIC EQUIPMENT MANUFACTURING Co.,Ltd. |
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Granted publication date: 20140521 |