CN107589568B - Automatic learning and detecting device and method for LED lamp string - Google Patents
Automatic learning and detecting device and method for LED lamp string Download PDFInfo
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Abstract
The invention discloses an automatic learning detection device and method for LED lamp strings, wherein the detection device comprises a main control computer, a constant current driving source and a voltage acquisition device, wherein the main control computer sends a detection parameter to the constant current driving source according to input configuration; the constant current driving source generates two groups of non-zero power supplies with different voltage values, and the non-zero power supplies are loaded on the LED lamp string to be tested in sequence; the voltage acquisition module acquires the voltage value of the LED lamp string to be detected and sends the voltage value to the main control computer to execute learning parameter operation, and the main control computer executes detection according to the setting of the learning parameters. The detection device and the detection method can realize the self-adaptive voltage value of the lamp string, avoid the complicated arrangement of a plurality of parameters of the lamp string, automatically calculate the test parameters to be configured by utilizing the initial configuration of a small quantity of parameters to execute the detection, have the switching of two working modes of detection and learning, support the detection of an open circuit state and the detection of a short circuit fault, and support the constant current output of two automatic switching gears of microampere and milliamp.
Description
Technical Field
The invention belongs to the field of liquid crystal module backlight detection, and particularly relates to an automatic learning detection device and method for an LED lamp string.
Background
At present, backlight plate detection means of liquid crystal module manufacturers generally drive the LED lamp string through a constant current source module, and the quality of the LED lamp string is judged through a lighting effect. Firstly, each test needs to be carried out to set the specification of the lamp string, and then the detection is complex; secondly, the detected defects can not be judged manually, the efficiency is low, and misjudgment is easy to cause; thirdly, the reason of the unlighted string lights cannot be judged; and fourthly, the adverse effect on equipment caused by damage of the lamp string cannot be effectively prevented. With the development of LED lamp strings, CCFL backlight is eliminated slowly, the occupancy of the LED lamp strings is increased more and more, and the market of LED lamp string testers is enlarged more and more.
For example, the prior art with patent document publication No. CN105044625A discloses a LED string light multi-parameter detection device, which includes a control module, a circuit module, an electrical characteristic detection module and an optical characteristic detection module, where the control module is composed of an analog signal generator, a digital signal generator and a communication module, and according to the above means, the traditional hardware structure is simplified, so that the detection of the electrical characteristics of the LED string light is complete, and it mainly solves the problems of high-speed switching of the power supply current and high-precision electrical characteristic parameter detection, and aims to implement synchronous execution of the detection of the electrical characteristics and the optical characteristics, but the above technology has some defects, and the problem of setting the string light specification cannot be avoided, and the setting of the string light specification is the key to ensure the accuracy of the test.
Disclosure of Invention
Aiming at the defects or the improvement requirements in the prior art, the invention provides an automatic learning detection device and a detection method for an LED lamp string, which can be used for pre-processing the lamp string parameters: the parameters of current, voltage precision, string number, OVP, OCP, open circuit/short circuit protection and the like are learned and then set, and the method has the technical effects of simplicity and convenience in operation, high usability, high use efficiency and the like.
In order to achieve the above object, according to the present invention, an automatic learning detection device for LED lamp strings is provided, wherein the detection device comprises a main control computer, a constant current driving source, and a voltage acquisition device, wherein the main control computer sends detection parameters configured by an input device to the constant current driving source; the constant current driving source generates a non-zero power supply and loads the non-zero power supply to the LED lamp string to be tested in sequence; the voltage acquisition device acquires the voltage value of the LED lamp string to be tested and sends the voltage value to the main control computer to execute learning parameter operation, the learning parameters comprise voltage precision, string number, overvoltage protection (OVP), cycle-by-cycle current limit protection (OCP), open circuit and short circuit, and the main control computer executes automatic configuration on the testing parameters of the LED lamp string to be tested according to the learning parameters.
Further, the input device is an operation interface panel with a display interface.
Further, the range of the non-zero power source generated by the constant current driving source is as follows: the low current range is 0.1mA-0.9mA, and the high current range is 1mA-400 mA.
Furthermore, the LED lamp string automatic learning detection device further comprises a protection module for protecting against electrostatic discharge (ESD) and large-voltage reverse flow and avoiding damage of the device.
Further, the learning parameter is calculated and then displayed on a display device included in the detection device.
The invention also discloses an automatic learning and detecting method of the LED lamp string, which is characterized by mainly comprising the following steps:
acquiring configuration parameters: setting output current, lighting an LED lamp string, collecting output voltage of the LED lamp string, and calculating configuration parameters, wherein the configuration parameters comprise voltage precision, string number, overvoltage protection (OVP), cycle-by-cycle current limit protection (OCP), open circuit parameters and short circuit parameters;
and (3) executing the test: and automatically configuring the test parameters of the LED lamp string according to the configuration parameters, and executing detection.
Further, the step of performing a test includes determining whether the following faults exist by different comparison result combinations: open circuit, short circuit, lamp string voltage, voltage accuracy are inconsistent.
Further, the configuration parameters are obtained according to the following calculation method:
the voltage precision is determined by comparing the acquired voltage value of each string of LED lamp strings to be tested with a set value; the number of strings is calculated by whether a current loop exists or not, and overvoltage protection (OVP) is carried out, and the actually acquired voltage value is added with a set empirical value; cycle-by-cycle current limit protection (OCP) and confirming by adopting the ratio of actually set current to collected current; the open circuit and the short circuit are judged through the collected voltage.
Further, the output power sources for lighting the LED lamp strings are two groups of non-zero power sources with different voltage values.
From another aspect, the invention also discloses an automatic learning and detecting method for the LED lamp string, which is characterized by comprising the following steps:
the method comprises the following steps: configuring a learning mode through an input device, setting current parameters through the input device, sending the current parameters to a constant current driving source by a main control computer, and lighting the LED lamp string to be tested;
step two: collecting the number of strings, voltage and whether open circuit or short circuit of the LED lamp string to be tested are fed back to the main control computer, and calculating voltage precision, overvoltage protection (OVP) and cycle-by-cycle current limit protection (OCP) by the main control computer;
step three, the learning parameters obtained in the step one and the step two are sent to the main control computer through the input device, and the main control computer drives a display device to display the learning parameters; meanwhile, the main control computer sends the learning parameters to the constant-current driving source;
step four, the constant current driving source generates two groups of non-zero power supplies V1 and V2 with different voltage values, the non-zero power supplies are loaded on the anode and the cathode of the LED lamp string to be tested in sequence, the voltage acquisition device acquires the voltage values of the anode and the cathode of all the LED lamp strings to be tested, and the corresponding relation data of the lamp strings and the voltage is sent to the main control computer;
after acquiring the corresponding relation between the lamp strings and the voltage, the main control computer compares the lamp strings with preset anode and cathode judgment voltages V1 'and V2', simultaneously compares voltage values among different lamp strings synchronously, and judges whether the problems of open circuit, short circuit and inconsistent lamp string voltages exist according to comparison results;
step six: if the abnormal state is judged, the main control computer closes the output and simultaneously displays the abnormal state; if no problem is detected, the main control computer outputs and lights the LED lamp string to be tested normally.
Generally, compared with the prior art, the above technical solution conceived by the present invention has the following beneficial effects:
(1) in the field of LED detection, parameter setting is complex, the panel production types of a client are various, the backlight plate needs to be switched and detected for many times due to different specifications, and current, voltage and string number are manually set according to different specifications of LEDs before detection, so that the whole detection operation flow is very complex; therefore, the scheme of introducing automatic learning in the field of LED testing is provided for solving the problems, other setting parameters can be automatically obtained by setting the initial configuration current, and the initial configuration current is automatically configured to the detection process, so that the detection efficiency is obviously improved;
(2) the other complex parameters, such as voltage precision, string number, OVP, OCP, open circuit, short circuit and other configuration parameters can be completed through a learning function only in a mode of automatically configuring current, then the open circuit, short circuit and voltage are accurately detected for the anode and the cathode of the LED string light, the ordered execution of automatic parameter configuration and fault detection is completed, and the redundant parameter configuration process is simplified.
In summary, according to the automatic learning and detecting device and method for the LED lamp string provided by the invention, an operator can detect the problems of open circuit, short circuit or inconsistent brightness of the lamp beads of the LED lamp string, support the detection of the open circuit state of the PCB printed circuit of the LED lamp string, support the detection of the short circuit fault of the PCB printed circuit of the LED lamp string, and support the poor detection of the continuous tin short circuit or breakdown short circuit of one or more lamp beads of the LED lamp string, and the automatic learning and detecting device and method for the LED lamp string have the characteristics of simple operation, strong usability, high use efficiency, low cost, complete functions and the like.
Drawings
Fig. 1 is a block diagram of a module structure of an automatic learning and detecting device for LED light strings implemented according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 1, according to the technical idea of the present invention, the present invention firstly discloses an automatic learning and detecting device for LED lamp strings, which mainly comprises a main control computer and a constant current driving source controlled and driven by the main control computer, wherein the constant current driving source is used for sending driving current to the LED lamp strings to be detected, a voltage collecting device collects voltage information from the LED lamp strings to be detected and inputs the voltage information to the main control computer for performing operation processing, the processing process further comprises a learning process, the result of the operation processing is output to a display device for performing display, an operation inspector performs input of various detection parameters through an input device according to data of the display device, and thus the main control computer can realize corresponding driving of the constant current driving source after performing processing, thereby driving the LED lamp strings to be detected to realize detection of problems such as corresponding faults.
In the actual detection process, as a specific hardware facility, the display device, the input device and the main control computer may be integrated into an instrument with a display interface and an input key panel, or when a large-scale main control computer needs data processing capability and data storage capability in a large-scale test, the display device and the input device are respectively arranged, and any arrangement scheme which uses the signal acquisition device to execute signal acquisition processing and has a learning mode is included in the protection of the scheme.
Specifically, the voltage acquisition device mainly acquires voltage signals of the LED lamp strings to be tested, so that the number of strings and voltage for lighting the lamp strips can be acquired, and parameters such as whether open circuit/short circuit occurs or not can be acquired and fed back to the main control computer, so that the main control computer can calculate the voltage progress and OVP/UVP of each string of lamp strings, and thus parameters such as voltage precision, transmission, OVP, OCP, open circuit, short circuit and the like which need to be set can be acquired.
In addition, the detection device realized according to the scheme can identify abnormal light string equipment, can give an alarm prompt and can output the abnormal light string caused by the fault, the fault is divided into the faults of OVP, OCP, open circuit, short circuit, exceeding voltage precision and the like, comparison and judgment are carried out by acquiring U/I, the alarm prompt is given after the judgment of the abnormal light string, the abnormal light string can be rapidly distinguished, and the output is the abnormal light string caused by the fault.
The main control computer can be driven to execute the switching of two working modes of detection and learning by the triggering of the input device; therefore, the learning mode that the voltage acquisition device acquires data and executes input parameters and the main control computer drives the constant current drive source to output the constant current signal for detection are realized, and the mode switching control method can be understood as the feedback input operation for switching the learning signal and the starting of the detection of the input drive signal are all well-known technologies in the field and are not described herein again.
Further, in the implemented apparatus, in one embodiment, the master controller may be an MCU;
further, on the realized device, in one embodiment, a protection module may be further disposed on the module, and mainly protects against ESD and large voltage back-flow to avoid damage to the device.
Furthermore, when the device works, the device is also provided with a driving power supply, and the detection device can provide working power supply in the running process.
The automatic learning detection method based on the inventive device mainly comprises the following steps:
a learning step:
the method comprises the following steps: the learning mode is configured through the input device, the current parameters are set through the keys and are transmitted to the constant current driving module through the main control computer, and the light bar to be tested is lightened through the output power supply of the constant current driving module;
step two: collecting parameters such as the number of strings of a lamp strip to be tested, voltage, whether open circuit/short circuit exists or not, and feeding back the parameters to the main control computer, wherein the main control computer calculates voltage precision and OVP/UVP according to each string of lamp strings, so that the parameters such as the voltage precision, the number of strings, OVP, OCP, open circuit, short circuit and the like which need to be set can be obtained;
setting current I to point the lamp strips, acquiring different U of each string according to the load R of each string of lamp strips, and judging the voltage precision (determined by comparing the acquired U of each string with a set value), the string number (judged by judging whether each string has a current loop), OVP (actually acquired U plus an empirical value set in a main control computer system), OCP (actually set current and acquired current ratio to confirm the OCP value), and open-circuit short circuit according to the voltage and current acquired by a voltage acquisition module according to the U and I of each string of lamp strips; empirical values are obtained by accumulation of one test data for a large number of samples, or parameters for a particular product model.
Thirdly, configuring LED lamp string parameters through a key, setting parameters such as the number of the LED lamp string strings to be detected, current, voltage precision, OVP, OCP, open circuit/short circuit protection and the like, sending the parameters to a main control computer, and sending data to a display interface of a display device by the main control computer for displaying;
step four, the main control computer sends the configured parameters to the constant current driving module and the detection module;
after receiving a power-on command, the constant current driving module generates two groups of non-zero power supplies V1 and V2 with different voltage values, and loads the non-zero power supplies V1 and V2 to the anode and the cathode of the LED lamp string light bar in sequence, and the voltage acquisition device acquires the voltage values of the anode and the cathode of all the LED lamp string light bars and sends the corresponding relation data of the lamp string and the voltage to the main control computer;
step six, after receiving voltage acquisition data, the main control computer compares the voltage with set anode and cathode judgment voltages V1 'and V2', simultaneously compares voltage values among different lamp strings synchronously, judges whether open circuit, short circuit and lamp string voltage inconsistency exist through different comparison result combinations, and if the problems that the lamp strings have open circuit, short circuit and lamp string voltage accuracy exceeds a range are detected, the detection module transmits the abnormal information to the main control computer;
step seven: for the processing of the abnormal state, the main control computer closes the output and simultaneously displays the abnormal state on the display screen; if no problem is detected, the main control computer outputs the lighting lamp string normally.
In summary, the detection principle according to the invention is: the power is firstly switched on, then the detection is carried out, the output is abnormally switched off, and the abnormal normal output is avoided.
The specific setting of the detection method realized by adopting an instrument integration setting mode according to the invention comprises the following steps:
after the instrument is opened, starting to press an 'SET' key through a key to enter a menu bar; selecting a test mode, and operating the test mode in a learning mode and a detection mode according to the above; selecting 'set detection current value', entering a current setting option column; respectively selecting 'set low current value' and 'set high current value' to set the output current of the constant current source; in one embodiment of the instrument, the low current value is set to be 0.1mA-0.9mA, and the user presses a 'TEST' key to confirm after setting is finished; in one embodiment of the detection instrument, the high current value is set to be in a range of 1mA-400mA, and a 'TEST' key is pressed for confirmation after the setting is completed.
In summary, after the above setting is completed, the display interface after the setting is completed mainly includes the following parameters: and displaying the magnitude of the output current, the detection precision, the detection state and the number of lighting strings.
(example: the display detection mode on the display interface of the instrument is Aging mode, the output interface is 2 nd path, the number of light bar strings is 8, the low current output is 0.1mA, the detection precision is +/-0.9V, the high current output is 20mA, the detection precision is +/-0.7V.)
According to one embodiment of the invention, the specific operation process is as follows:
low current detection function opening interface
1. After the low current detection function is started, the low current detection state is firstly entered after each detection is started, and then the high current detection state is entered;
2. pressing "←" and "→" switches whether or not to turn on the low current detection, and after completion of setting, pressing the "TEST" key confirms.
Mode selection interface
1. Mode selection can switch between TEST mode and Aging mode;
2. pressing "←" and "→" switches between TEST and Aging modes, and after completion of setting, pressing "TEST" key for confirmation.
Interface for setting detection precision
1. The detection precision is set to be a VBLU voltage floating range, and the parameter range is set to be +/-0.3V- +/-1.5V;
2. pressing "↓" and "↓" switches cursor options, pressing "←" and "→" adjusts the voltage range, and pressing the "TEST" key after setting is completed confirms.
Interface for setting lamp string number
1. The setting of the number of the lamp strings supports the setting of 1-8 lamp strings;
2. the channel number is selected as a default, the channel number configuration is not effective because the light spotter has only 1 channel, cursor options are switched by pressing "↓" and "↓" at the channel number configuration, the light string number is adjusted by pressing "←" and "→", and the setting is confirmed by pressing the "TEST" key.
In the instrument configuration embodiment corresponding to the technical idea of the invention, the learning function related to the specific operation only needs to manually set the current value, the voltage precision and the string number, and the corresponding data acquisition function is started in the learning mode, so that the acquired parameters such as OVP, OCP, open circuit/short circuit protection and the like are automatically converted through software.
The LED lamp string current detection device is designed and researched by adopting the latest single chip microcomputer, is widely applied to on-line quality inspection of Light Bar products of LED lamp string Back Light manufacturers, IQC feeding and OQC discharging inspection, has the learning function and acousto-optic double alarm effects, and can well help QC on-line inspection personnel to find out badness in time so as to ensure good quality of the products.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. The automatic learning detection device for the LED lamp strings is characterized by comprising a main control computer, a constant current driving source and a voltage acquisition device, wherein the main control computer sends detection parameters configured by an input device to the constant current driving source; the constant current driving source generates a non-zero power supply and loads the non-zero power supply to the LED lamp string to be tested in sequence; the voltage acquisition device acquires the voltage value of the LED lamp string to be tested and sends the voltage value to the main control computer to execute learning parameter operation, the learning parameters comprise voltage precision, string number, overvoltage protection (OVP), cycle-by-cycle current limit protection (OCP), open circuit and short circuit, and the main control computer executes automatic configuration on the testing parameters of the LED lamp string to be tested according to the learning parameters.
2. The LED light string automatic learning detection device of claim 1, wherein the input device is an operation interface panel having a display interface.
3. The automatic learning and detecting device for LED lamp strings according to claim 1 or 2, wherein the range of the non-zero power generated by the constant current driving source is as follows: the low current range is 0.1mA-0.9mA, and the high current range is 1mA-400 mA.
4. The LED light string automatic learning detection device of claim 1, further comprising a protection module for protecting against electrostatic discharge (ESD) and large voltage back-fill to prevent device damage.
5. The LED light string automatic learning detection device of claim 4, wherein the learning parameters are calculated and displayed on a display device included in the detection device.
6. An automatic learning and detecting method for LED lamp strings is characterized by mainly comprising the following steps:
acquiring configuration parameters: setting output current, lighting an LED lamp string, collecting output voltage of the LED lamp string, and calculating configuration parameters, wherein the configuration parameters comprise voltage precision, string number, overvoltage protection (OVP), cycle-by-cycle current limit protection (OCP), open circuit parameters and short circuit parameters;
and (3) executing the test: and automatically configuring the test parameters of the LED lamp string according to the configuration parameters, and executing detection.
7. The method of claim 6 in which the step of performing testing includes determining whether the following faults exist by different combinations of comparison results: open circuit, short circuit, lamp string voltage, voltage accuracy are inconsistent.
8. The LED light string auto-learning detection method of claim 7, wherein the configuration parameters are obtained as follows:
the voltage precision is determined by comparing the acquired voltage value of each string of LED lamp strings to be tested with a set value; the number of strings is calculated by whether a current loop exists or not, and overvoltage protection (OVP) is carried out, and the actually acquired voltage value is added with a set empirical value; cycle-by-cycle current limit protection (OCP) and confirming by adopting the ratio of actually set current to collected current; the open circuit and the short circuit are judged through the collected voltage.
9. The method as claimed in claim 6, wherein the output power of the lighting LED string is two sets of non-zero power with different voltage values.
10. An automatic learning and detecting method for LED lamp strings is characterized by comprising the following steps:
the method comprises the following steps: configuring a learning mode by using an input device, setting current parameters through the input device, sending the current parameters to a constant current driving source by a main control computer, and lighting the LED lamp string to be tested;
step two: collecting the number of strings, voltage and whether open circuit or short circuit of the LED lamp string to be tested are fed back to the main control computer, and calculating voltage precision, overvoltage protection (OVP) and cycle-by-cycle current limit protection (OCP) by the main control computer;
step three, the learning parameters obtained in the step one and the step two are sent to the main control computer through the input device, and the main control computer drives a display device to display the learning parameters; meanwhile, the main control computer sends the learning parameters to the constant-current driving source;
step four, the constant current driving source generates two groups of non-zero power supplies V1 and V2 with different voltage values, the non-zero power supplies are loaded on the anode and the cathode of the LED lamp string to be tested in sequence, the voltage acquisition device acquires the voltage values of the anode and the cathode of all the LED lamp strings to be tested, and the corresponding relation data of the lamp strings and the voltage is sent to the main control computer;
after acquiring the corresponding relation between the lamp strings and the voltage, the main control computer compares the lamp strings with preset anode and cathode judgment voltages V1 'and V2', simultaneously compares voltage values among different lamp strings synchronously, and judges whether the problems of open circuit, short circuit and inconsistent lamp string voltages exist according to comparison results;
step six: if the abnormal state is judged, the main control computer closes the output and simultaneously displays the abnormal state; if no problem is detected, the main control computer outputs and lights the LED lamp string to be tested normally.
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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 |
| 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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