CN103048583B - A kind of LED charactron pick-up unit and method - Google Patents
A kind of LED charactron pick-up unit and method Download PDFInfo
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Abstract
The present invention is applicable to LED charactron detection field, provides a kind of LED charactron pick-up unit and method.The embodiment of the present invention comprises central processing module by employing, the one or more driving detection module selecting the quantity of holding identical with the position of tested LED charactron and the LED charactron pick-up unit of testing result display module, described one or more driving detection module is coordinated to carry out polarity to tested LED charactron by central processing module, qualification and pin positions insert situation and judge, its circuit structure is simple, cost is low, one or more driving detection module adopts constant current source to drive and ensure that LED charactron steady operation in testing process, and do not affect its life-span, in addition, also show judged result information so that testing staff intuitively can obtain testing result by testing result display module, substantially increase detection efficiency.
Description
Technical field
The invention belongs to LED charactron detection field, particularly relate to a kind of LED charactron pick-up unit and method.
Background technology
At present, LED is as a kind of new type light source, and be widely used in every field because it possesses brightness high, low in energy consumption and life-span long advantage, wherein, LED charactron shows module as one, is also applied in various commercial unit and civilian household electrical appliances.In order to ensure the quality of LED charactron, LED production firm all can carry out quality testing to LED charactron before dispatching from the factory, and for LED charactron purchaser, need the LED charactron purchased it to carry out quality testing equally, to meet the quality requirements to LED charactron.
The LED charactron quality determining method that prior art provides needs manually to be carried out by testing staff, and easily occur test leakage and empty side, detection efficiency is lower; And the detecting instrument used is mostly comparatively heavy, and computing machine must be equipped with operate, this sample and test manufacture time convenient not, need to need to carry out software development for different detections, indirectly improve testing cost; In testing process, easily there is overcurrent by constant voltage driving LED charactron and make LED service life reduction; In addition, when carrying out Check up polarity for LED charactron, needs manually arrange polarity, do not possess the function automatically identifying charactron polarity, arrange work comparatively loaded down with trivial details, and it does not also possess and detects charactron pin positions and whether insert correct and LED charactron qualification rate.Therefore, it is low high with testing cost to there is detection efficiency in prior art, affects LED serviceable life and automatically cannot identify whether the polarity of LED charactron and LED charactron pin positions insert correctly, cannot check the problem of LED charactron qualification rate.
Summary of the invention
The object of the present invention is to provide a kind of LED charactron pick-up unit, be intended to solve detection efficiency existing for prior art low high with testing cost, affect LED serviceable life and automatically cannot identify whether LED charactron polarity and LED charactron pin positions insert correctly, cannot check the problem of LED charactron qualification rate.
The present invention is achieved in that a kind of LED charactron pick-up unit, detects, comprise power supply supplying module to tested LED charactron, and described LED charactron pick-up unit also comprises:
Central processing module, the one or more driving detection module selecting the quantity of holding identical with the position of described tested LED charactron and testing result display module;
Described central processing module is connected with described tested LED charactron, described power supply supplying module, described one or more driving detection module and described testing result display module, and described one or more driving detection module is also connected with described tested LED charactron, described one or more driving detection module and described testing result display module are also connected with described power supply supplying module and supply to obtain power supply;
Described central processing module exports the detection level of identical polar simultaneously to each section of choosing end of described tested LED charactron and described one or more driving detection module, described tested LED charactron is driven to work by described one or more driving detection module with the form that constant current source drives, potentiometry is carried out with the polarity to described tested LED charactron again by described central processing module each choosing end to described tested LED charactron, qualification and pin positions insert situation and judge, and drive described testing result display module to show corresponding testing result information in real time according to judged result.
Another object of the present invention is also to provide a kind of LED charactron detection method based on above-mentioned LED charactron pick-up unit, and described LED charactron detection method comprises the following steps:
Central processing module exports the detection level of identical polar simultaneously to each section of choosing end of tested LED charactron and one or more driving detection module;
Described one or more driving detection module drives described tested LED charactron work with the form that constant current source drives;
Described central processing module each choosing end to described tested LED charactron carries out potentiometry and inserts situation with the polarity to described tested LED charactron, qualification and pin positions and judge, and drives described testing result display module to show corresponding testing result information in real time according to judged result.
The present invention comprises central processing module by employing, the one or more driving detection module selecting the quantity of holding identical with the position of tested LED charactron and the LED charactron pick-up unit of testing result display module, described one or more driving detection module is coordinated to carry out polarity to described tested LED charactron by described central processing module, qualification and pin positions insert situation and judge, its circuit structure is simple, cost is low, described one or more driving detection module adopts constant current source to drive and ensure that LED charactron steady operation in testing process, and do not affect its life-span, in addition, also show judged result information so that testing staff intuitively can obtain testing result by described testing result display module, substantially increase detection efficiency, solve detection efficiency existing for prior art low high with testing cost, affect LED serviceable life and automatically cannot identify whether LED charactron polarity and LED charactron pin positions insert correctly, the problem of LED charactron qualification rate cannot be checked.
Accompanying drawing explanation
Fig. 1 is the function structure chart of the LED charactron pick-up unit that the embodiment of the present invention provides;
Fig. 2 is the schematic diagram of four conjuncted LED charactrons involved by the embodiment of the present invention;
The cut-away view that Fig. 3 is four conjuncted LED charactrons involved by the embodiment of the present invention when being common anode pole charactron;
The cut-away view that Fig. 4 is four conjuncted LED charactrons involved by the embodiment of the present invention when being common cathode charactron;
Fig. 5 is the exemplary circuit structural drawing of the LED charactron pick-up unit that the embodiment of the present invention provides;
Fig. 6 is the LED charactron electrical specification curve map involved by the embodiment of the present invention;
Fig. 7 is the schematic diagram of the charactron Charactes Display figure of character mode lcd LCD involved by the embodiment of the present invention;
Fig. 8 is the realization flow figure of the LED charactron detection method that the embodiment of the present invention provides.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The embodiment of the present invention comprises central processing module by employing, the one or more driving detection module selecting the quantity of holding identical with the position of tested LED charactron and the LED charactron pick-up unit of testing result display module, described one or more driving detection module is coordinated to carry out polarity to tested LED charactron by central processing module, qualification and pin positions insert situation and judge, its circuit structure is simple, cost is low, one or more driving detection module adopts constant current source to drive and ensure that LED charactron steady operation in testing process, and do not affect its life-span, in addition, also show judged result information so that testing staff intuitively can obtain testing result by testing result display module, substantially increase detection efficiency.
Fig. 1 shows the modular structure of the LED charactron pick-up unit that the embodiment of the present invention provides, and for convenience of explanation, illustrate only part related to the present invention, details are as follows:
LED charactron pick-up unit 100 detects tested LED charactron 200, and it comprises power supply supplying module 101, LED charactron pick-up unit 100 and also comprises:
Central processing module 102, the one or more driving detection module 103 selecting the quantity of holding identical with the position of tested LED charactron 200 and testing result display module 104.
Central processing module 102 is connected with tested LED charactron 200, power supply supplying module 101, one or more driving detection module 103 and testing result display module 104, and one or more driving detection module 103 is also connected with tested LED charactron 200, one or more driving detection module 103 and testing result display module 104 are also connected to obtain power supply and supply with power supply supplying module 101.
Central processing module 102 exports the detection level of identical polar simultaneously to each section of choosing end of tested LED charactron 200 and one or more driving detection module 103, tested LED charactron 200 is driven to work by one or more driving detection module 103 with the form that constant current source drives, potentiometry is carried out with the polarity to tested LED charactron 200 again by central processing module 102 each choosing end to tested LED charactron 200, qualification rate and pin positions insert situation and judge, and drive the testing result display module 104 corresponding testing result information of display in real time according to judged result.
In embodiments of the present invention, conveniently testing staff can know the testing result of tested LED charactron 200 in testing process by auditory tone cues, LED charactron pick-up unit 100 can also comprise an auditory tone cues module 105, auditory tone cues module 105 is connected with power supply supplying module 101 and central processing module 102, alarm of sounding when it is for detecting that tested LED charactron 200 is defective or pin positions inserts mistake at central processing module 102.
Further, conveniently testing staff carries out software debugging and renewal to LED charactron pick-up unit 100, LED charactron pick-up unit 100 also can comprise an online programming interface 106, online programming interface 106 is connected with power supply supplying module 101 and central processing module 102, and it is for providing the data transmission channel of software debugging and renewal for central processing module 102.
Further, conveniently testing staff is preserved data such as the testing result information that LED charactron pick-up unit 100 obtains in testing process by computing machine, backs up and the yield analysis of LED charactron, LED charactron pick-up unit 100 also can comprise a communication serial port module 107, communication serial port module 107 is connected with power supply supplying module 101 and central processing module 102, and it for setting up serial data communication channel between central processing module 102 and the computing machine of outside.
Below to be detected as to four conjuncted LED charactrons the exemplary circuit structure that example provides the LED charactron pick-up unit involved by the embodiment of the present invention, as shown in Figures 2 to 4, tested LED charactron 200 is four conjuncted LED charactrons (common anode pole and common cathode), it comprises five positions choosing end (1,2,4,6,8) and eight sections choosing end (3,5,11,12,13,14,15,16), for convenience of explanation, Fig. 5 illustrate only the exemplary circuit structure division of LED charactron pick-up unit related to the present invention, and details are as follows:
Detection module 103 is driven to comprise:
Resistance R5, resistance R6, PNP type triode Q1, diode D2, diode D3, NPN type triode Q2, resistance R7, resistance R8, voltage stabilizing diode D4, resistance R9, resistance R10 and voltage stabilizing diode D5;
The first end of resistance R5 and the negative electrode of voltage stabilizing diode D5 are connected to the positive pole of the electrochemical capacitor C3 that power supply supplying module 101 comprises altogether, resistance R6 is connected between second end of resistance R5 and the emitter of PNP type triode Q1, the collector of PNP type triode Q1 connects the anode of diode D2, the common contact of the negative electrode of diode D2 and the anode of diode D3 selects with one of them position of tested LED charactron 200 simultaneously holds (1, 2, 4, 6, 8) and the first input/output terminal PA0 (ADC0) of single-chip microcomputer U2 that comprises of central processing module 102 connect to one of them port in the 8th input/output terminal PA7 (ADC7), the negative electrode of diode D3 connects the collector of NPN type triode Q2, the first end of the emitter contact resistance R7 of NPN type triode Q2, second end of the first end connecting resistance R7 of resistance R8, the anode of voltage stabilizing diode D4 and second end of resistance R8 are connected to ground altogether, the negative electrode of voltage stabilizing diode D4 and the base stage of NPN type triode Q2 are connected to the first end of resistance R9 altogether, second end of resistance R9 and the first end of resistance R10 are connected to the 27 input/output terminal PD2 (INT0) of single-chip microcomputer U2 altogether to one of them port in the 32 input/output terminal PD7 (OC2), second end of resistance R10 and the base stage of PNP type triode Q1 are connected to the anode of voltage stabilizing diode D5 altogether.
As shown in Figure 5, the first input/output terminal PA0 (ADC0) of single-chip microcomputer U2 is connected first driving detection module 103 with the 27 input/output terminal PD2 (INT0); The second input/output terminal PA1 (ADC1) of single-chip microcomputer U2 is connected second and drives detection module 103 with the 28 input/output terminal PD3 (INT1); The 3rd input/output terminal PA2 (ADC2) of single-chip microcomputer U2 is connected the 3rd and drives detection module 103 with the 29 input/output terminal PD4 (OC1B); The 4th input/output terminal PA3 (ADC3) of single-chip microcomputer U2 is connected the 4th and drives detection module 103 with the 30 input/output terminal PD5 (OC1A); The 5th input/output terminal PA4 (ADC4) of single-chip microcomputer U2 is connected the 5th and drives detection module 103 with the 31 input/output terminal PD6 (ICP).
For the internal structure design of above-mentioned driving detection module 103, it needs the volt-ampere characteristic considering LED, if adopt drive of constant voltage source LED, with the impact of temperature, drive current can increase considerably and off-rating, and then adds light decay, and reduces the serviceable life of LED.And if employing constant current source driving LED just can avoid drive current to affect reliability because of off-rating, and the consistance of YC requirement can be obtained, light-emitting diode luminance and the magnitude of current that passes through almost linearly proportional relation, when LED so will be made to send same brightness, just must ensure that LED electrical flow is consistent; Constant output current, output voltage can go change with the forward voltage values of LED, meets so very much LED characteristic, can extend the serviceable life of LED.According to electrical specification curve (as shown in Figure 6) in the specifications of LED charactron, in the interval of the suitable working current 5 ~ 20mA of LED charactron, the forward conduction voltage drop of every section of LED is all within 2.5V, so should adopt Constant Current-Source Design to driving detection module 103, and when should consider to ensure LED conducting when design constant current source, two ends pressure drop has the allowance of 2.5V.
Therefore, the base voltage of base voltage and NPN type triode Q2 that the Constant Current-Source Design that the driving detection module 103 that the embodiment of the present invention provides adopts is actually PNP type triode Q1 is fixed on 2.5V(respectively and namely achieves two constant current sources under the effect of voltage stabilizing diode D5 and voltage stabilizing diode D4), and base emitter voltage V
bEfor 0.7V, so emitter voltage is also fixed, thus the demand to pressure drop when ensure that tested LED charactron each section of conducting; The resistance of the emitter resistance (resistance R5 and resistance R6) of PNP type triode Q1 and the emitter resistance (resistance R7 and resistance R8) of NPN type triode Q2 is regulated to get final product the size of regulating constant flow valuve, and to arrange two resistant series herein as emitter resistance be to ensure the dirigibility that resistance adjustment is arranged in pairs or groups, the resistance selection precision of adjustment electric current is 1%.
In above-mentioned two constant current sources, when PNP type triode Q1 works, electric current flows out from its collector, and when NPN type triode Q2 works, electric current flows into from its collector, if the equal set of common contact of each section of choosing end of tested LED charactron 200 and resistance R9 and resistance R10 is 0, then tested LED charactron 200 can be driven to emit light for during the charactron of common anode pole, now, start working with the constant current source that PNP type triode Q1 is core, and quit work with the constant current source that NPN type triode Q2 is core, electric current holds the common contact (namely the first input/output terminal PA0 (ADC0) of single-chip microcomputer U2 is to the 5th input/output terminal PA4 (ADC4)) of the anode of diode D2 and the anode of diode D3 flowed to each driving detection module 103 from each section of choosing of tested LED charactron 200, if the equal set of common contact of each section of choosing end of tested LED charactron 200 and resistance R9 and resistance R10 is 1, then tested LED charactron 200 can be driven to emit light for during common cathode charactron, now, quit work with the constant current source that PNP type triode Q1 is core, and start working with the constant current source that NPN type triode Q2 is core, electric current selects from each section that the common contact (namely the first input/output terminal PA0 (ADC0) of single-chip microcomputer U2 is to the 5th input/output terminal PA4 (ADC4)) of the anode of the anode of the diode D2 each driving detection module 103 and diode D3 flows to tested LED charactron 200 and holds, diode D2 and diode D3 be used for single-chip microcomputer U2 the 27 input/output terminal PD2 (INT0) to the 31 input/output terminal PD6 (ICP) set be 0 and the 9th input/output terminal PB0 (XCK/T0) is 1 to 16 input/output terminal PB7 (SCK) set time prevent current flowing backwards from entering the collector of PNP type triode Q1, reach protection PNP type triode Q1 object.
Power supply supplying module 101 comprises:
Power interface JP1, diode D1, inductance L 1, electric capacity C1, electric capacity C2, electrochemical capacitor C3, inductance L 2, electric capacity C4, electric capacity C5, voltage stabilizer U1, resistance R1, resistance R2, electric capacity C6, electric capacity C7, resistance R3 and LED 1;
The first end 1 of power interface JP1 connects+12V direct supply, the negative electrode of diode D1 and the first end of inductance L 1 are connected to the first end 1 of power interface JP1 altogether, the first end of the second end of inductance L 1 and the first end of electric capacity C1 and electric capacity C2 is connected to the positive pole of electrochemical capacitor C3 altogether, the anode of diode D1 and second end of electric capacity C1, second end of electric capacity C2, the negative pole of electrochemical capacitor C3 and the first end of inductance L 2 are connected to ground altogether, second end of inductance L 2 is connected with second end 2 of power interface JP1 and the 3rd end 3 simultaneously, the input end IN of the first end of electric capacity C4 and the first end of electric capacity C5 and voltage stabilizer U1 is connected to the positive pole of electrochemical capacitor C3 altogether, the first end of resistance R1 and the first end of resistance R2 are connected to the earth terminal ADJ/GND of voltage stabilizer U1 altogether, second end of second end of resistance R1 and second end of electric capacity C4 and electric capacity C5 is connected to ground altogether, the first output terminal OUT1 of voltage stabilizer U1 and second end of the second output terminal OUT2 and resistance R2 are connected to the first end of resistance R3 altogether, between the first end that electric capacity C6 and electric capacity C7 is connected in parallel in resistance R3 and ground, second end of the anode of LED 1 and negative electrode difference contact resistance R3 and ground.Wherein, the voltage stabilizing chip of voltage stabilizer U1 can be model be AP1084 series.
Central processing module 102 comprises:
Electric capacity C8, electric capacity C9, crystal oscillator X1, single-chip microcomputer U2, resistance R4, electric capacity C10, keyswitch S1, inductance L 3 and electric capacity C11;
The first end of electric capacity C8 and the first end of crystal oscillator X1 are connected to the oscillation output end XTAL2 of single-chip microcomputer U2 altogether, the first end of electric capacity C9 and second end of crystal oscillator X1 are connected to the oscillation inputs XTAL1 of single-chip microcomputer U2 altogether, second end of electric capacity C8 and second end of electric capacity C9 are connected to ground altogether, the first end of resistance R4 and the first end of inductance L 3, the first power end VCC1 of single-chip microcomputer U2, second source end VCC2, 3rd power end VCC3 and analog reference voltage end AREF is connected to the first output terminal OUT1 of voltage stabilizer U1 and the common contact of the second output terminal OUT2 altogether, the first end of second end of resistance R4 and the first end of keyswitch S1 and electric capacity C10 is connected to the reset terminal of single-chip microcomputer U2 altogether
second end of keyswitch S1 and second end of electric capacity C10 are connected to ground altogether, second end of inductance L 3 and the first end of electric capacity C11 are connected to the analog electrical pressure side AVCC of single-chip microcomputer U2 altogether, the second end ground connection of electric capacity C11, the 9th input/output terminal PB0 (XCK/T0) of single-chip microcomputer U2, the tenth input/output terminal PB1 (T1), the 11 input/output terminal PB2 (AIN0/INT2), the 12 input/output terminal PB3 (AIN1/OC0), the 13 input/output terminal
14 input/output terminal PB5 (MOSI), the 15 input/output terminal PB6 (MISO) and the 16 input/output terminal PB7 (SCK) connect respectively tested LED charactron 200 first paragraph selects end 14, second segment selects end 16, the 3rd section select end 13, the 4th section select end 3, the 5th section select end 5, the 6th section select end 11, the 7th section select end 15 and the 8th section to select end 12, the first earth terminal GND1, the second earth terminal GND2 of single-chip microcomputer U2, the 3rd earth terminal GND3 and the equal ground connection of the 4th earth terminal GND4.Wherein, the single-chip microcomputer of single-chip microcomputer U2 can be specifically model be ATMEGA16, it is a kind of 8-bit microprocessor with high-performance, low-power consumption, possesses the In-System Programmable flash memory of 16K byte, input/output terminal (i.e. I/O mouth) maximum output current can reach 40mA, meet driving circuit designing requirement far away, this is that 51 conventional series monolithics are beyond one's reach because 51 series monolithics draw current capacity more weak; Moreover ATMEGA16 inside is integrated with 10,8 tunnel ADC(analog to digital converter), meet the demand of the position choosing end of tested LED charactron 200 being carried out to voltage sample detection.
Testing result display module 104 comprises:
Resistance R11, resistance R12 and character mode lcd LCD;
The first end of resistance R11 and first pin 1 of character mode lcd LCD are connected to ground altogether, second end of resistance R11 and the first end of resistance R12 are connected to the tripod 3 of character mode lcd LCD altogether, crus secunda 2 and second end of resistance R12 of character mode lcd LCD are connected to the positive pole of electrochemical capacitor C3 altogether, 15 pin 15 of character mode lcd LCD also connects the positive pole of electrochemical capacitor C3, the 4th pin 4 of character mode lcd LCD, 5th pin 5, 6th pin 6, 11 pin 11, 12 pin 12, tenth tripod the 13 and the 14 pin 14 connects the 17 input/output terminal PC0 (SCL) of single-chip microcomputer U2 respectively, 18 input/output terminal PC1 (SDA), 19 input/output terminal PC2 (TCK), 21 input/output terminal PC4 (TDO), 22 input/output terminal PC5 (TDI), 7th pin 7 of the 23 input/output terminal PC6 (TOSC1) and the 24 input/output terminal PC7 (TOSC2), character mode lcd LCD, octal 8, 9th pin 9 and the tenth pin 10 all sky connect, and the 16 pin 16 ground connection of character mode lcd LCD.Wherein, character mode lcd LCD can be specifically model be 1602 dot matrix type Liquid Crystal Module, it is a kind of dot matrix type Liquid Crystal Module being exclusively used in display letter, numeral, symbol etc., it is made up of several 5 × 7 dot character positions, each dot character position can show a character, there is the interval of a some distance between every, often also have the interval of a some distance between row, serve the effect of character pitch and line space.+ 5V voltage, contrast is adjustable, include reset circuit, various control command is provided, as several functions such as cls, character blinking, cursor flashes, display displacements, have 80 byte display data memory DDRAM, inside have the character generator CGROM of the font of 160 5 × 7 dot matrix, 8 can by the character generator CGRAM of user-defined 5 × 7.Utilize this module interface mode and operational order simply and easily flexibly, good man-machine interaction graphical interfaces can be formed, it can show character and numeral, also Simple figure display can be completed, Low-voltage Low-power is one distinguishing feature, and it has hardware circuit simply, and volume is little and displaying contents abundant, lightly ultra-thin, the plurality of advantages such as cost performance is high.
In actual application, for the ease of character mode lcd LCD dismounting on circuit boards and replacing, a LCD socket can be set between character mode lcd LCD and resistance R11, resistance R12 and single-chip microcomputer U2.
Auditory tone cues module 105 comprises:
Resistance R13, PNP type triode Q3, diode D6, resistance R14 and hummer U3;
The first end of resistance R13 connects the 20 input/output terminal PC3 (TMS) of single-chip microcomputer U2, the base stage of PNP type triode Q3 and emitter be second end of contact resistance R13 and the positive pole of electrochemical capacitor C3 respectively, the collector of PNP type triode Q3 and the negative electrode of diode D6 be connected to altogether the positive power source terminal of hummer U3+, the negative power end of hummer U3-be connected to the first end of resistance R14 altogether with the anode of diode D6, the second end ground connection of resistance R14.
First pin 1 of online programming interface 106, the 5th pin 5, the 7th pin 7 and the 9th pin 9 connect the 14 input/output terminal PB5 (MOSI), the reset terminal of single-chip microcomputer U2 respectively
16 input/output terminal PB7 (SCK) and the 15 input/output terminal PB6 (MISO).
Communication serial port module 107 comprises:
Inductance L 4, electric capacity C12, resistance R15, resistance R16, NPN type triode Q4, resistance R17, resistance R18, inductance L 5, electric capacity C13, resistance R19, NPN type triode Q5, resistance R20, resistance R21, resistance R22 and serial ports joint CON1;
The first end of inductance L 4 and the first end of electric capacity C12 are connected to the positive pole of electrochemical capacitor C3 altogether, the second end ground connection of electric capacity C12, second end of inductance L 4 is connected with the first end of resistance R15 and the first end of resistance R21 simultaneously, the collector of second end of resistance R15 and the first end of resistance R16 and NPN type triode Q4 is connected to the 25 input/output terminal PD0 (RXD) of single-chip microcomputer U2 altogether, the first end of the base stage of NPN type triode Q4 and emitter difference contact resistance R17 and ground, resistance R18 is connected between the base stage of NPN type triode Q4 and emitter, second end of resistance R16 and second end of resistance R17 are connected to the tripod 3 of serial ports joint CON1 altogether, the first end of resistance R15 and the first end of electric capacity C13 are connected to the positive pole of electrochemical capacitor C3 altogether, the second end ground connection of electric capacity C13, the first end of the second end contact resistance R19 of inductance L 5, the first end of second end of resistance R19 and the collector of NPN type triode Q5 and resistance R22 is connected to the crus secunda 2 of serial ports joint CON1 altogether, the first end of the base stage of NPN type triode Q5 and emitter difference contact resistance R20 and ground, second end of second end of resistance R20 and second end of resistance R21 and resistance R22 is connected to the 26 input/output terminal PD1 (TXD) of single-chip microcomputer U2 altogether, first pin 1 ground connection of serial ports joint CON1.
Fig. 8 shows the realization flow of the LED charactron detection method that the embodiment of the present invention provides, and for convenience of explanation, illustrate only part related to the present invention, details are as follows:
In step sl, central processing module exports the detection level of identical polar simultaneously to each section of choosing end of tested LED charactron and one or more driving detection module.
Wherein, detect level and be divided into high level and low level, identical polar refers to and is all high level or low level, can be 0(low level to each section of choosing end set simultaneously of tested LED charactron) or 1(high level).
In step s 2, one or more driving detection module drives the work of tested LED charactron with the form that constant current source drives.
In step s3, central processing module each choosing end to tested LED charactron carries out potentiometry and inserts situation with the polarity to tested LED charactron, qualification and pin positions and judge, and drives testing result display module to show corresponding testing result information in real time according to judged result.
Step S3 specifically comprises the following steps:
Central processing module is by each polarity selecting the electromotive force of end and the first reference potential, the second reference potential and the 3rd reference potential to carry out contrasting to judge each segment numeral pipe in tested LED charactron and qualification of tested LED charactron;
According to the polarity of segment numeral pipe each in tested LED charactron, central processing module judges that the pin positions of tested LED charactron inserts situation;
The pin positions that central processing module drives testing result display module to show the polarity information of each segment numeral pipe in tested LED charactron, eligibility information and tested LED charactron in real time inserts situation information.
Wherein, first reference potential, the second reference potential and the 3rd reference potential are type according to tested LED charactron and fixed, for conventional LED charactron, the electromotive force of each choosing end of the LED charactron of common anode pole is generally be between 1.5V ~ 2.5V (if the electromotive force of position choosing end is lower than 1.5V, this segment numeral pipe is also common anode pole, but it is bad section); The electromotive force of each choosing end of the LED charactron of common cathode is generally be in (if the electromotive force of position choosing end is lower than 2.5V or higher than 3.5V, this segment numeral pipe is also common cathode, but it is bad section) between 2.5V ~ 3.5V; Therefore, the first reference potential, the second reference potential and the 3rd reference potential can be respectively 1.5V, 2.5V and 3.5V.
Below in conjunction with example, above-mentioned LED charactron detection method is described further:
When LED charactron pick-up unit 100 starts to detect tested LED charactron 200, equal for its 27 input/output terminal PD2 (INT0) to the 32 input/output terminal PD7 (OC2) set is 0 by single-chip microcomputer U2, and to its 9th input/output terminal PB0 (XCK/T0) to the 16 input/output terminal PB7 (SCK) one by one set be 0, then the first input/output terminal PA0 (ADC0) to the 5th input/output terminal PA4 (ADC4) of single-chip microcomputer U2 starts five position choosing ends (1 to tested LED charactron 200, 2, 4, 6, 8) potentiometry is carried out one by one, so just can detect piecemeal tested LED charactron 200, if the current tested position choosing end (1 of tested LED charactron 200, 2, 4, 6 or 8) electromotive force is between 1.5V to 2.5V, then represent that this segment numeral pipe is common anode pole charactron, then single-chip microcomputer U2 can show the knowledge of common anode pole marks and group of four figures character as shown in Figure 7 by control character type liquid crystal LCD, and it is qualified to show " PASS " character representation tested LED charactron on character mode lcd LCD, in addition, if the electromotive force of current tested position choosing end (1,2,4,6 or 8) of tested LED charactron 200 is less than 1.5V, then show that this segment numeral pipe is common anode pole charactron, but it is bad section, then single-chip microcomputer U2 can show the knowledge of common anode pole marks but does not show the character of this bad section by control character type liquid crystal LCD, the alarm and driving hummer U3 sounds, and on character mode lcd LCD, show " FAIL " character representation tested LED charactron subsequently defective.
Equal for its 27 input/output terminal PD2 (INT0) to the 32 input/output terminal PD7 (OC2) set is 1 by single-chip microcomputer U2, and to its 9th input/output terminal PB0 (XCK/T0) to the 16 input/output terminal PB7 (SCK) one by one set be 1, then the first input/output terminal PA0 (ADC0) to the 5th input/output terminal PA4 (ADC4) of single-chip microcomputer U2 starts five position choosing ends (1 to tested LED charactron 200, 2, 4, 6, 8) potentiometry is carried out one by one, so just can detect piecemeal tested LED charactron 200, if the current tested position choosing end (1 of tested LED charactron 200, 2, 4, 6 or 8) electromotive force is between 2.5V to 3.5V, then represent that this segment numeral pipe is common cathode charactron, then single-chip microcomputer U2 can show common cathode mark and group of four figures character as shown in Figure 7 by control character type liquid crystal LCD, and it is qualified to show " PASS " character representation tested LED charactron on character mode lcd LCD, in addition, if the electromotive force of current tested position choosing end (1,2,4,6 or 8) of tested LED charactron 200 is less than 2.5V or is greater than 3.5V, then show that this segment numeral pipe is common cathode charactron, but it is bad section, then single-chip microcomputer U2 can show common cathode mark but does not show the character of this bad section by control character type liquid crystal LCD, the alarm and driving hummer U3 sounds, and on character mode lcd LCD, show " FAIL " character representation tested LED charactron subsequently defective.
In addition, if when occurring that in above-mentioned Check up polarity process the polarity of multistage charactron is different, can judge that the pin positions of tested LED charactron 200 is anti-inserted, and show " ERROR " character by single-chip microcomputer U2 control character type liquid crystal LCD, drive hummer U3 to sound alarm simultaneously.
In other embodiments of the present invention, in order to adapt to the detection of the more conjuncted LED charactron of figure place, 38 code translators and single-chip microcomputer U2 is added with the use of to realize multiplexed object in central processing module 102, in addition, single-chip microcomputer U2 also can adopt the chip possessing more I/O mouths to meet the detection demand of the conjuncted LED charactron of multidigit; For the LED charactron of some big current voltage requirements, the present invention can also by high voltage and high-power driving PNP type triode Q1 and NPN type triode Q2 work, or sampling resistor can be added in driving detection module 103, and the emitter resistance (resistance R5 and resistance R6) of PNP type triode Q1 and the emitter resistance (resistance R7 and resistance R8) of NPN type triode Q2 are replaced to adjustable resistance drive tested LED charactron 200 to detect to realize tabilized current power supply.
The embodiment of the present invention comprises central processing module by employing, the one or more driving detection module selecting the quantity of holding identical with the position of tested LED charactron and the LED charactron pick-up unit of testing result display module, described one or more driving detection module is coordinated to carry out polarity to tested LED charactron by central processing module, qualification and pin positions insert situation and judge, its circuit structure is simple, cost is low, one or more driving detection module adopts constant current source to drive and ensure that LED charactron steady operation in testing process, and do not affect its life-span, in addition, also show judged result information so that testing staff intuitively can obtain testing result by testing result display module, substantially increase detection efficiency, solve detection efficiency existing for prior art low high with testing cost, affect LED serviceable life and automatically cannot identify whether LED charactron polarity and LED charactron pin positions insert correctly, the problem of LED charactron qualification rate cannot be checked.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a LED charactron pick-up unit, detects tested LED charactron, comprises power supply supplying module, it is characterized in that, described LED charactron pick-up unit also comprises:
Central processing module, the one or more driving detection module selecting the quantity of holding identical with the position of described tested LED charactron and testing result display module;
Described central processing module is connected with described tested LED charactron, described power supply supplying module, described one or more driving detection module and described testing result display module, and described one or more driving detection module is also connected with described tested LED charactron, described one or more driving detection module and described testing result display module are also connected with described power supply supplying module and supply to obtain power supply;
Described central processing module exports the detection level of identical polar simultaneously to each section of choosing end of described tested LED charactron and described one or more driving detection module, described tested LED charactron is driven to work by described one or more driving detection module with the form that constant current source drives, potentiometry is carried out with the polarity to described tested LED charactron again by described central processing module each choosing end to described tested LED charactron, qualification and pin positions insert situation and judge, and drive described testing result display module to show corresponding testing result information in real time according to judged result,
Described driving detection module comprises:
Resistance R5, resistance R6, PNP type triode Q1, diode D2, diode D3, NPN type triode Q2, resistance R7, resistance R8, voltage stabilizing diode D4, resistance R9, resistance R10 and voltage stabilizing diode D5;
The first end of described resistance R5 and the negative electrode of described voltage stabilizing diode D5 are connected to the first output terminal of the voltage stabilizer that described power supply supplying module comprises and the common contact of the second output terminal altogether, between the second end that described resistance R6 is connected to described resistance R5 and the emitter of described PNP type triode Q1, the collector of described PNP type triode Q1 connects the anode of described diode D2, the common contact of the negative electrode of described diode D2 and the anode of described diode D3 selects with one of them of described tested LED charactron simultaneously to be held and the first input/output terminal of single-chip microcomputer that described central processing module comprises is connected to one of them port in the 8th input/output terminal, the negative electrode of described diode D3 connects the collector of described NPN type triode Q2, the emitter of described NPN type triode Q2 connects the first end of described resistance R7, second end of resistance R7 described in first termination of described resistance R8, the anode of described voltage stabilizing diode D4 and second end of described resistance R8 are connected to ground altogether, the negative electrode of described voltage stabilizing diode D4 and the base stage of described NPN type triode Q2 are connected to the first end of described resistance R9 altogether, second end of described resistance R9 and the first end of described resistance R10 are connected to the 27 input/output terminal of described single-chip microcomputer altogether to one of them port in the 32 input/output terminal, second end of described resistance R10 and the base stage of described PNP type triode Q1 are connected to the anode of described voltage stabilizing diode D5 altogether,
Described power supply supplying module comprises:
Power interface, diode D1, inductance L 1, electric capacity C1, electric capacity C2, electrochemical capacitor C3, inductance L 2, electric capacity C4, electric capacity C5, voltage stabilizer, resistance R1, resistance R2, electric capacity C6, electric capacity C7, resistance R3 and LED 1;
First termination+12V direct supply of described power interface, the negative electrode of described diode D1 and the first end of described inductance L 1 are connected to the first end of described power interface altogether, the first end of the second end of described inductance L 1 and the first end of described electric capacity C1 and described electric capacity C2 is connected to the positive pole of described electrochemical capacitor C3 altogether, the anode of described diode D1 and second end of described electric capacity C1, second end of described electric capacity C2, the negative pole of described electrochemical capacitor C3 and the first end of described inductance L 2 are connected to ground altogether, second end of described inductance L 2 simultaneously with the second end and the three-terminal link of described power interface, the first end of described electric capacity C4 and the first end of described electric capacity C5 and the input end of described voltage stabilizer are connected to the positive pole of described electrochemical capacitor C3 altogether, the first end of described resistance R1 and the first end of described resistance R2 are connected to the earth terminal of described voltage stabilizer altogether, second end of second end of described resistance R1 and second end of described electric capacity C4 and described electric capacity C5 is connected to ground altogether, second end of the first output terminal of described voltage stabilizer and the second output terminal and described resistance R2 is connected to the first end of described resistance R3 altogether, between the first end that described electric capacity C6 and described electric capacity C7 is connected in parallel in described resistance R3 and ground, anode and the negative electrode of described LED 1 are connected second end of described resistance R3 and ground respectively.
2. LED charactron pick-up unit as claimed in claim 1, it is characterized in that, described central processing module comprises:
Electric capacity C8, electric capacity C9, crystal oscillator X1, single-chip microcomputer, resistance R4, electric capacity C10, keyswitch, inductance L 3 and electric capacity C11;
The first end of described electric capacity C8 and the first end of described crystal oscillator X1 are connected to the oscillation output end of described single-chip microcomputer altogether, the first end of described electric capacity C9 and second end of described crystal oscillator X1 are connected to the oscillation inputs of described single-chip microcomputer altogether, second end of described electric capacity C8 and second end of described electric capacity C9 are connected to ground altogether, the first end of described resistance R4 and the first end of described inductance L 3, the first end of described electric capacity C11, first power end of described single-chip microcomputer, second source end, 3rd power end and analog reference voltage end are connected to the first output terminal of described voltage stabilizer and the common contact of the second output terminal altogether, the first end of second end of described resistance R4 and the first end of described keyswitch and described electric capacity C10 is connected to the reset terminal of described single-chip microcomputer altogether, second end of described keyswitch and second end of described electric capacity C10 are connected to ground altogether, second end of described inductance L 3 is connected to the analog electrical pressure side of described single-chip microcomputer, the second end ground connection of described electric capacity C11, the 9th input/output terminal of described single-chip microcomputer, tenth input/output terminal, 11 input/output terminal, 12 input/output terminal, 13 input/output terminal, 14 input/output terminal, 15 input/output terminal and the 16 input/output terminal connect the first paragraph choosing end of described tested LED charactron respectively, second segment choosing end, 3rd section of choosing end, 4th section of choosing end, 5th section of choosing end, 6th section of choosing end, 7th section of choosing end and the 8th section of choosing end, the first earth terminal of described single-chip microcomputer, second earth terminal, 3rd earth terminal and the equal ground connection of the 4th earth terminal.
3. LED charactron pick-up unit as claimed in claim 2, it is characterized in that, described testing result display module comprises:
Resistance R11, resistance R12 and character mode lcd; Described character mode lcd to be model be 1602 dot matrix type Liquid Crystal Module;
The first end of described resistance R11 and the first pin of described character mode lcd are connected to ground altogether, second end of described resistance R11 and the first end of described resistance R12 are connected to the tripod of described character mode lcd altogether, the crus secunda of described character mode lcd and second end of described resistance R12 are connected to the first output terminal of described voltage stabilizer and the common contact of the second output terminal altogether, 15 pin of described character mode lcd also connects the first output terminal of described voltage stabilizer and the common contact of the second output terminal, the 4th pin of described character mode lcd, 5th pin, 6th pin, 11 pin, 12 pin, tenth tripod and the 14 pin connect the 17 input/output terminal of described single-chip microcomputer respectively, 18 input/output terminal, 19 input/output terminal, 21 input/output terminal, 22 input/output terminal, 23 input/output terminal and the 24 input/output terminal, the 7th pin of described character mode lcd, octal, 9th pin and the equal sky of the tenth pin connect, and the 16 pin ground connection of described character mode lcd.
4. LED charactron pick-up unit as claimed in claim 3, it is characterized in that, described LED charactron pick-up unit also comprises auditory tone cues module, described auditory tone cues module is connected with described power supply supplying module and described central processing module, and described auditory tone cues module is used for sounding when described central processing module detects that described tested LED charactron is defective or pin positions inserts mistake alarm.
5. LED charactron pick-up unit as claimed in claim 3, it is characterized in that, described LED charactron pick-up unit also comprises online DLL (dynamic link library), described online programming interface is connected with described power supply supplying module and described central processing module, and described online programming interface is for providing the data transmission channel of software debugging and renewal for described central processing module.
6. LED charactron pick-up unit as claimed in claim 3, it is characterized in that, described LED charactron pick-up unit also comprises communication serial port module, described communication serial port module is connected with described power supply supplying module and described central processing module, and described communication serial port module is used for setting up serial data communication channel between described central processing module and the computing machine of outside.
7. based on a LED charactron detection method for LED charactron pick-up unit according to claim 1, it is characterized in that, described LED charactron detection method comprises the following steps:
Central processing module exports the detection level of identical polar simultaneously to each section of choosing end of tested LED charactron and one or more driving detection module;
Described one or more driving detection module drives described tested LED charactron work with the form that constant current source drives;
Described central processing module each choosing end to described tested LED charactron carries out potentiometry and inserts situation with the polarity to described tested LED charactron, qualification and pin positions and judge, and drives described testing result display module to show corresponding testing result information in real time according to judged result.
8. described LED charactron detection method as claimed in claim 7, it is characterized in that, described central processing module each choosing end to described tested LED charactron carries out potentiometry and inserts situation with the polarity to described tested LED charactron, qualification and pin positions and judge, and specifically comprises the following steps according to the step that judged result drives described testing result display module to show corresponding testing result information in real time:
Described central processing module is by each polarity selecting the electromotive force of end and the first reference potential, the second reference potential and the 3rd reference potential to carry out contrasting to judge each segment numeral pipe in described tested LED charactron and qualification of described tested LED charactron;
According to the polarity of each segment numeral pipe in described tested LED charactron, described central processing module judges that the pin positions of described tested LED charactron inserts situation;
The pin positions that described central processing module drives described testing result display module to show the polarity information of each segment numeral pipe in described tested LED charactron, eligibility information and tested LED charactron in real time inserts situation information.
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| CN105116355A (en) * | 2015-09-15 | 2015-12-02 | 武汉精测电子技术股份有限公司 | LED module backlight lamp string detection device and detection method thereof |
| CN105974335B (en) * | 2016-06-06 | 2019-04-02 | 格力电器（武汉）有限公司 | Nixie tube detection equipment |
| CN110320012B (en) * | 2019-08-20 | 2022-06-07 | 肖义俊 | LED intelligent manufacturing detection equipment |
| CN113253086B (en) * | 2021-06-11 | 2025-01-10 | 烟台持久钟表有限公司 | Digital tube self-diagnosis and repair system, method and time display device |
| CN116229857B (en) * | 2022-12-29 | 2025-09-12 | 中科芯集成电路有限公司 | A constant current source drive control system for digital tubes |
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