CN107589568A - A kind of LED string learns detection means and method automatically - Google Patents
A kind of LED string learns detection means and method automatically Download PDFInfo
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Abstract
The invention discloses a kind of LED string to learn detection means and method automatically, and detection means includes main control computer, constant current driving source, voltage collecting device, and main control computer is sent in constant current driving source according to the detection parameters of input configuration；Constant current driving source generates the non-zero power supply of two groups of difference magnitudes of voltage, and is loaded into sequence on LED string to be measured；The magnitude of voltage that voltage acquisition module gathers LED string to be measured is sent in main control computer execution learning parameter computing, setting perform detection of the main control computer according to learning parameter.The detection means and detection method realized according to the present invention, adaptive lamp string magnitude of voltage can be realized, and avoid the lengthy and tedious setting of the multiple parameters of lamp string, using the initial configuration of a small amount of parameter so as to calculate test parameter perform detection to be configured automatically, with the switching for detecting and learning two kinds of mode of operations, open-circuit condition detection and short trouble detection are supported, supports two microampere, milliampere automatic switchover gear constant current outputs.
Description
Technical field
The invention belongs to liquid crystal module group backlight detection field, learns detection means automatically more particularly to a kind of LED string
And method.
Background technology
The backlight detection means of liquid crystal module manufacturer at present, LED string is driven generally by constant current source module, led to
Lighting effect is crossed to judge the quality of LED string.This is primarily present following drawback, first, test needs to enter lamp string specification every time
Row setting could carry out detecting comparatively laborious；Second, can not need artificial judgment to the bad of detection, efficiency is low and easily causes
Erroneous judgement；Third, the lamp string not worked to point can not judge its reason；Fourth, it can not effectively prevent lamp string damage to caused by equipment not
Good influence.With the development of LED string, the meeting of CCFL backlights slowly is eliminated, and the occupation rate of LED string is more and more, so
The market of LED string test machine can be increasing.
Such as patent document Publication No. CN105044625A prior art discloses a kind of inspection of LED cluster of lamps, ornamental multi-parameter
Device is surveyed, it includes control module, circuit module, electrical characteristics detection module and light characteristic detection module, and control module is by simulating
Signal generator, digital signal generator and communication module composition, according to above-mentioned means, simplify traditional hardware configuration, make
It is perfect to obtain the detection of LED string electrical characteristics, it mainly solves supply current switching and the detection of high precision electro characterisitic parameter at a high speed
Problem, aim at the detection to electrical characteristics and light characteristic and realize synchronous execution, but above-mentioned technology also has some defects,
The unavoidable offering question for carrying out lamp string specification, and the setting of lamp string specification, it is the key for the accuracy for ensureing test.
The content of the invention
For the disadvantages described above or Improvement requirement of prior art, the invention provides a kind of LED string to learn to detect automatically
Device and detection method, can be in advance to lamp string parameter：Electric current, voltage accuracy, string number, OVP, OCP, open/short protection etc.
Parameter performs setting after being learnt, have it is easy to operate, be easily used, the technique effect such as service efficiency height.
To achieve the above object, it is proposed, according to the invention, a kind of LED string is provided and learns detection means automatically, it is characterised in that
The detection means includes main control computer, constant current driving source, voltage collecting device, detection ginseng of the main control computer according to input configuration
Number is sent in the constant current driving source；The constant current driving source generates non-zero power supply, and is loaded into LED to be measured in sequence
On string；The magnitude of voltage that the voltage acquisition module gathers the LED string to be measured is sent in the main control computer execution learning parameter
Computing, the learning parameter include voltage accuracy, string number, overvoltage protection (OVP), Cycle by Cycle current limit and protect (OCP), open
Road, short circuit, the main control computer are performed to the test parameter of the LED string to be measured according to the learning parameter and automatically configured.
Further, the input unit is the operation interface panel with display interface.
Further, the scope of the non-zero power supply of the constant current driving source generation is：Low current range is 0.1mA-
0.9mA, high current scope are 1mA-400mA.
Further, the LED string learns detection means automatically also includes protection module, for realizing to static discharge
(ESD) instead fill with big voltage and carry out protecting avoiding device damage.
Further, display is performed after the learning parameter calculates in the display device that the detection means includes.
The present invention there is further disclosed herein a kind of automatic learning detection method of LED string, it is characterised in that this method is mainly wrapped
Include following steps：
Obtain configuration parameter：Output current is set, lightening LED lamp string, the LED string output voltage is gathered, calculates
Configuration parameter, the configuration parameter is voltage accuracy, string number, overvoltage protection (OVP), Cycle by Cycle current limit are protected (OCP), opened
Road, short-circuit parameter；
Perform test：Configuration is realized to the test parameter of the LED string automatically according to the configuration parameter, performs inspection
Survey.
Further, the testing procedure that performs is including as follows to judge whether by different comparative result combinations
Failure：Open circuit, short circuit, lamp string voltage, voltage accuracy are inconsistent.
Further, the configuration parameter is calculated as follows mode and obtained：
Voltage accuracy, compared using the magnitude of voltage for often going here and there LED string to be tested of collection with setting value to determine；String
Number, by whether thering is current loop to perform calculating, overvoltage protection (OVP), using the magnitude of voltage of actual acquisition plus the warp set
Test value；Cycle by Cycle current limit protects (OCP), and confirmation is compared using actual setting electric current and collection electric current；Open circuit short circuit passes through
The voltage of collection performs judgement.
Further, the out-put supply of lightening LED lamp string is the non-zero power supply of two groups of difference magnitudes of voltage.
From still further aspect, the invention also discloses a kind of automatic learning detection method of LED string, it is characterised in that institute
Learning detection method is stated to comprise the following steps：
Step 1：Mode of learning is configured by input unit, current parameters are set by the input unit, main control computer will
The current parameters are issued in constant current driving source, light LED string to be tested；
Step 2：Gather the string number of the LED string to be tested, voltage, whether open a way or short-circuit feedback is in the master control
Machine, the main control computer calculate voltage accuracy, overvoltage protection (OVP), Cycle by Cycle current limit protection (OCP)；
Step 3, the learning parameter that the step 1 and the step 2 obtain is provided in institute by the input unit
Main control computer is stated, while main control computer driving display device performs the display of the learning parameter；The main control computer is by institute simultaneously
State learning parameter and be sent in the constant current driving source；
Step 4, the constant current driving source generate non-zero the power supply V1 and V2 of two groups of difference magnitudes of voltage, and by it in order
It is loaded on the anode and negative electrode of the LED string to be tested, voltage acquisition module gathers all LED strings to be tested
The magnitude of voltage of anode and negative electrode, and the corresponding relation data of lamp string and voltage is sent in the main control computer；
Step 5, the main control computer is after the corresponding relation of the lamp string and voltage is collected, with default anode and the moon
Pole judges that voltage V1 ＇ and V2 ＇ are compared, while the magnitude of voltage between different lamp strings is also synchronously compared, by comparative result come
Judge whether open circuit, short circuit, lamp string voltage inconsistence problems；
Step 6：If being judged as abnormality, the main control computer closes output, while shows the abnormality；If
Do not detect and go wrong, normally the LED string to be tested is lighted in output to the main control computer.
In general, by the contemplated above technical scheme of the present invention compared with prior art, have below beneficial to effect
Fruit：
(1) in LED detection fields, parameter setting is complicated, and the panel production type of client is various, the different rule of backlight
Lattice are, it is necessary to carry out multiple change detection, and to be directed to LED specifications difference before testing, progress sets electric current, electricity manually
Pressure, string number, cause entirely to detect operating process extremely complex；Therefore, the application proposes to introduce automatic study in LED testing fields
Scheme solve the above problems, by setting initial configuration electric current to automatically obtain remaining arrange parameter, automatically configure inspection
Flow gauge is so as to significantly increasing detection efficiency；
(2) only by the mode for automatically configuring electric current, by remaining complex parameters, voltage accuracy, string number, OVP, OCP,
The configuration parameters such as open circuit, short circuit can all be completed by learning functionality, then LED string anode and negative electrode are opened a way, be short-circuit,
Voltage carries out accuracy detection, completes the orderly execution of Automatic parameter configuration and fault detect, and lengthy and tedious parameter configuration is entered
Journey simplifies.
Sum it up, learn detection means and method automatically according to LED string provided by the invention, can be for making operator
The problems such as detection LED series winding connects open circuit, short circuit or lamp bead brightness are inconsistent, supports LED string PCB printed circuit open-circuit conditions
Detection, support the detection of LED string PCB printed wires short troubles, support single or plurality of LEDs lamp string lamp bead company's tin short circuit or
The bad detection of puncture short, have it is easy to operate, be easily used, service efficiency is high, cost is low, the congruent feature of function.
Brief description of the drawings
Fig. 1 is the module composition structured flowchart that a kind of LED string realized according to the present invention learns detection means automatically.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in each embodiment of invention described below
Conflict can is not formed each other to be mutually combined.
As shown in figure 1, according to the technical thought of the present invention, the present invention is to disclose a kind of LED string automatically to learn first
Detection means, the device mainly include main control computer, and the constant current driving source of driving is controlled by main control computer, and constant current driving source is used for
Send driving current and give LED string to be measured, information of voltage of the voltage collecting device collection from LED string to be measured, and input
Main control computer is given to perform calculation process, this processing procedure also includes learning process, the result of calculation process is output in into display
Display is performed on device, operation inspection person performs the defeated of various detection parameters by input unit according to the data of display device
Enter, so as to which the respective drive to constant current driving source can be realized after main control computer execution processing, so as to drive LED string to be measured to realize
The detection of the problems such as corresponding failure.
Wherein, in the detection process of reality, as specific hardware facility, display device, input unit and main control computer
The instrument integral type that there is display interface and input key panel that can be integrated, or need to count in large-scale test
According to disposal ability and data storage capacities relatively large main control computer when, the shape that is set respectively using display device and input unit
Formula, it is any all to be wrapped to perform the mode of signal acquisition process so as to possess the plan of establishment of mode of learning using signal pickup assembly
It is contained within the protection of this programme.
Specifically, wherein voltage acquisition module mainly gather be LED string to be tested voltage signal, so as to
To collect string number, the voltage of lighting lamp bar, if the parameter feedback such as open/short can be counted in main control computer, thus main control computer
Voltage progress, the OVP/UVP of every cluster of lamps, ornamental string are calculated, voltage accuracy, transmission, OVP, the OCP for needing to set can be then obtained, open
The parameters such as road, short circuit.
In addition, the detection means realized according to this programme, can recognize abnormal lamp string equipment, have alarm, and
And it is why failure produces abnormal lamp string that can export, above-mentioned failure is divided into OVP, OCP, opens a way, be short-circuit, beyond voltage essence
The failures such as degree, carry out contrast judgement by gathering U/I, are judged as alarm after which kind of exception, can quickly screen exception
Lamp string, output are because abnormal caused by which kind of failure.
By the triggering of input unit, main control computer perform detection can be driven and learn the switching of two kinds of mode of operations；From
And to realize that above-mentioned voltage collecting device gathered data performs the mode of learning of input parameter, and main control computer driving constant current is driven
Dynamic source output constant current signal detection both of which, the control method of this pattern switching are appreciated that using switching learning signal
Feed back input computing, and start detection input drive signal, be all technology known in the art, it is no longer superfluous herein
State.
Further, on the device of realization, main control computer can be MCU in one of which embodiment；
Further, on the device of realization, in one of which embodiment, protection mould can also be set to above-mentioned module
Block, mainly are carried out by protection and avoids device damage by ESD and the anti-filling of big voltage.
Further, when said apparatus works, be further equipped with driving power, can with above-mentioned detection device operation mistake
Working power is provided in journey.
And the automatic learning detection method that the invention device of the present invention is based on, it mainly comprises the following steps:
Learning procedure：
Step 1：Mode of learning is configured by input unit, sets current parameters to be issued to by main control computer by button
Constant-current driven module, lamp bar to be tested is lighted by constant-current driven module out-put supply；
Step 2：Gather the string number of lamp bar to be tested, voltage, whether the parameter feedback main control computer such as open/short, main control computer
Voltage accuracy, OVP/UVP are calculated according to every cluster of lamps, ornamental string, the voltage accuracy that so needs to set, string number, OVP, OCP, open circuit,
The parameters such as short circuit can be got；
Set electric current I to carry out a lamp bar according to per cluster of lamps, ornamental bar load R, the different U of every string is collected, according to each cluster of lamps, ornamental bar
U and I, can determine whether voltage accuracy (using the U of collection is often gone here and there and the contrast of setting value determines), string number (by every string whether
Have current loop to be judged), OVP (U of actual acquisition adds the empirical value that sets in main control computer system), OCP (actually set
Put electric current and confirm OCP values with gathering electric current and comparing), the short-circuit voltage x current gathered by acquisition module of open circuit sentences to perform
It is disconnected；Empirical value is by the accumulation of a detection data to a large amount of samples, or the parameter of specific products model.
Step 3, LED string parameter is configured by button, LED string string number, the electricity currently to be detected are set
The parameters such as stream, voltage accuracy, OVP, OCP, open/short protection, and main control computer is handed down to, while main control computer sends out data
Display device display interface is given to be shown；
The parameter of configuration is issued constant-current driven module, detection module by step 4, main control computer；
Step 5, after constant-current driven module receives out electricity order, non-zero the power supply V1 and V2 of two groups of difference magnitudes of voltage are generated,
And it is loaded on the anode and negative electrode of LED cluster of lamps, ornamental bar in order, voltage acquisition module gathers all LED cluster of lamps, ornamental bars
The magnitude of voltage of anode and negative electrode, and the corresponding relation data of lamp string and voltage is sent to main control computer；
Step 6, main control computer judge voltage V1 ＇ and V2 ＇ after voltage acquisition data are received, with the anode and negative electrode of setting
Compare, while the magnitude of voltage between different lamp strings is also synchronously compared, and is combined by different comparative results to judge whether
Inconsistent in the presence of open circuit, short circuit, lamp string voltage, if detecting, lamp string has open circuit, short circuit, lamp string voltage accuracy to go beyond the scope etc. and asked
This abnormal information can be transmitted to main control computer by topic, detection module；
Step 7：Processing for abnormality, main control computer closes output, while abnormality is included in display screen
On；Gone wrong if not detecting, the normal output point bright light string of main control computer.
In a word, it is according to the detection principle of the present invention：Electricity is first opened, is then detected, has abnormal close to export, it is without exception
Normal output.
A kind of realize that the specific of above-mentioned detection method sets by the way of instrument integration setting according to what the present invention realized
Put and comprise the following steps：
After opening instrument, set out by button and press " SET " key and enter menu bar；Test pattern is selected, according to above-mentioned institute
State, test pattern is operated in mode of learning and detection pattern；Selection " setting detection current value ", into current settings option
Column；Select " setting low current value " and " setting high current value " that constant current source output current is set respectively；In instrument of the present invention
Low current value setting range is 0.1mA-0.9mA in one of embodiment of device, and the confirmation of " TEST " key is pressed after the completion of setting；
High current value setting range is 1mA-400mA in one of embodiment of detecting instrument of the present invention, after the completion of setting
Press the confirmation of " TEST " key.
In a word, after completing above-mentioned setting, the display interface for completing just to postpone mainly includes following parameter：Display output
Size of current, accuracy of detection, detection state, point lamp string number.
(example：Show that detection pattern is Aging patterns on the display interface of instrument, output interface is the 2nd tunnel, lamp bar string number
For 8 strings, low current output 0.1mA, accuracy of detection ± 0.9V, high current output 20mA, accuracy of detection ± 0.7V.)
According to the one of which embodiment of the present invention, specific operating process is：
Low current detection function opens interface
1st, after low current detection function is opened, start detection every time and be introduced into low current detection state, then enter back into height
Current detecting state；
2nd, low current detection whether is opened by " ← " and " → " switching, the confirmation of " TEST " key is pressed after the completion of setting.
Model selection interface
1st, the changeable TEST and Aging both of which of model selection；
2nd, by " ← " and " → " switching TEST and Aging patterns, the confirmation of " TEST " key is pressed after the completion of setting.
Set accuracy of detection interface
1st, accuracy of detection is set as VBLU voltage domains of walker, and setup parameter scope is ± 0.3V- ± 1.5V；
2nd, by " ↑ " and " ↓ " switching cursor option, voltage range is adjusted by " ← " and " → ", is pressed after the completion of setting
" TEST " key confirms.
Set lamp string number interface
1st, lamp string number setting supports 1-8 cluster of lamps, ornamental bar to set；
2nd, port number acquiescence selector channel 2, because apparatus for lighting up only has 1 tunnel, way configuration herein does not come into force, by " ↑ " and " ↓ "
Switch cursor option, lamp string number is adjusted by " ← " and " → ", the confirmation of " TEST " key is pressed after the completion of setting.
In the apparatus preparation embodiment corresponding to technical thought in the present invention, learning functionality involved by specific operation is only
Current value need to be set manually, voltage accuracy, string number and the corresponding data acquisition function unlatching under mode of learning, so as to obtain
The parameters such as OVP, OCP, open/short protection are converted automatically by software.
The present invention is using the LED string current detecting equipment of newest single-chip microcomputer design research and development, is widely used in LED string
The Light Bar On-line Products quality restrictions of Back Light manufacturers and IQC chargings and OQC OQCs, product have study work(
Can and sound-light double alarm effect, the online reviewers of QC can be helped to find bad to ensure product fine quality in time well.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, all any modification, equivalent and improvement made within the spirit and principles of the invention etc., all should be included
Within protection scope of the present invention.
Claims (10)
1. a kind of LED string learns detection means automatically, it is characterised in that the detection means includes main control computer, constant current drives
Source, voltage collecting device, the main control computer are sent in the constant current driving source according to the detection parameters of input configuration；The constant current
Driving source generates non-zero power supply, and is loaded into sequence on LED string to be measured；Treated described in the voltage acquisition module collection
The magnitude of voltage for surveying LED string is sent in the main control computer execution learning parameter computing, and the learning parameter includes voltage accuracy, string
Number, overvoltage protection (OVP), Cycle by Cycle current limit protection (OCP), open circuit, short circuit, the main control computer is according to the learning parameter
Test parameter execution to the LED string to be measured automatically configures.
2. LED string as claimed in claim 1 learns detection means automatically, it is characterised in that the input unit be with
The operation interface panel of display interface.
3. LED string as claimed in claim 1 or 2 learns detection means automatically, it is characterised in that the constant current driving source life
Into the scope of non-zero power supply be：Low current range is 0.1mA-0.9mA, and high current scope is 1mA-400mA.
4. the LED string as described in any one in claim 1-3 learns detection means automatically, it is characterised in that the LED
Lamp string learns detection means automatically also includes protection module, prevents for realizing instead to fill static discharge (ESD) and big voltage
Protect avoiding device damage.
5. LED string as claimed in claim 4 learns detection means automatically, it is characterised in that the learning parameter calculates
Afterwards display is performed in the display device that the detection means includes.
6. a kind of automatic learning detection method of LED string, it is characterised in that this method mainly comprises the following steps：
Obtain configuration parameter：Output current is set, lightening LED lamp string, the LED string output voltage is gathered, calculates configuration
Parameter, the configuration parameter be voltage accuracy, string number, overvoltage protection (OVP), Cycle by Cycle current limit protect (OCP), open circuit,
Short-circuit parameter；
Perform test：Configuration, perform detection are realized to the test parameter of the LED string automatically according to the configuration parameter.
7. the automatic learning detection method of LED string as claimed in claim 6, it is characterised in that the execution testing procedure bag
Include and combined by different comparative results to judge whether following failure：Open circuit, short circuit, lamp string voltage, voltage accuracy are not
Unanimously.
8. the automatic learning detection method of LED string as claimed in claim 7, it is characterised in that the configuration parameter is according to such as
Lower calculation obtains：
Voltage accuracy, compared using the magnitude of voltage for often going here and there LED string to be tested of collection with setting value to determine；String number,
By whether there is current loop to perform calculating, overvoltage protection (OVP), using the magnitude of voltage of actual acquisition plus the experience set
Value；Cycle by Cycle current limit protects (OCP), and confirmation is compared using actual setting electric current and collection electric current；Open circuit short circuit is by adopting
The voltage of collection performs judgement.
9. the automatic learning detection method of LED string as claimed in claim 6, it is characterised in that lightening LED lamp string it is described defeated
Go out non-zero power supply of the power supply for two groups of difference magnitudes of voltage.
10. a kind of automatic learning detection method of LED string, it is characterised in that the learning detection method comprises the following steps：
Step 1：Mode of learning is configured using input unit, current parameters are set by the input unit, main control computer is by described in
Current parameters are issued in constant current driving source, light LED string to be tested；
Step 2：Gather the string number of the LED string to be tested, voltage, whether open a way or short-circuit feedback is in the main control computer, institute
State main control computer and calculate voltage accuracy, overvoltage protection (OVP), Cycle by Cycle current limit protection (OCP)；
Step 3, the learning parameter that the step 1 and the step 2 obtain is provided in the master by the input unit
Control machine, while main control computer driving display device performs the display of the learning parameter；The main control computer is by simultaneously
Practise parameter and be sent in the constant current driving source；
Step 4, the constant current driving source generate non-zero the power supply V1 and V2 of two groups of difference magnitudes of voltage, and it is loaded in order
Onto the anode and negative electrode of the LED string to be tested, voltage acquisition module gathers the anode of all LED strings to be tested
With the magnitude of voltage of negative electrode, and the corresponding relation data of lamp string and voltage is sent in the main control computer；
Step 5, the main control computer are sentenced after the corresponding relation of the lamp string and voltage is collected with default anode and negative electrode
Power-off pressure V1 ＇ and V2 ＇ is compared, while the magnitude of voltage between different lamp strings is also synchronously compared, and is judged by comparative result
With the presence or absence of open circuit, short circuit, lamp string voltage inconsistence problems；
Step 6：If being judged as abnormality, the main control computer closes output, while shows the abnormality；If do not examine
Problem is measured, normally the LED string to be tested is lighted in output to the main control computer.
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| CN111833634B (en) * | 2019-04-17 | 2021-07-13 | 青岛海信网络科技股份有限公司 | Signal lamp fault detection method and device |
| CN114326171A (en) * | 2021-11-30 | 2022-04-12 | 苏州华兴源创科技股份有限公司 | Screen detection method and device |
| CN114326171B (en) * | 2021-11-30 | 2024-01-26 | 苏州华兴源创科技股份有限公司 | Screen detection method and device |
| CN116189581A (en) * | 2023-04-27 | 2023-05-30 | 杭州视芯科技股份有限公司 | LED open circuit detection method and circuit, and LED driving method and circuit |
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