CN101762761A - Test method for LED power board - Google Patents
Test method for LED power board Download PDFInfo
- Publication number
- CN101762761A CN101762761A CN201010300752A CN201010300752A CN101762761A CN 101762761 A CN101762761 A CN 101762761A CN 201010300752 A CN201010300752 A CN 201010300752A CN 201010300752 A CN201010300752 A CN 201010300752A CN 101762761 A CN101762761 A CN 101762761A
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- Prior art keywords
- led power
- led
- power panel
- board
- power board
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- 238000010998 test method Methods 0.000 title claims abstract description 13
- 238000001514 detection method Methods 0.000 claims abstract description 10
- 238000005070 sampling Methods 0.000 claims abstract description 8
- 238000004458 analytical method Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 abstract description 2
- 230000002349 favourable Effects 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 2
- 230000002950 deficient Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Abstract
The present invention relates to a test method for an LED power board, which comprises an LED power board to be tested and an LED backlight board for detecting whether the LED power board is qualified. The present invention is characterized in that when the LED power board to be tested is connected with the LED backlight board for detection, the power output bus of the LED power board is connected with a sampling resistance in series, and a voltage detection circuit is used for detecting voltage values at both ends of the sampling resistance and transmitting the voltage values to a test board for analysis and processing, thereby determining whether the LED power board is qualified or not. The test method simplifies detection processes for LED power boards and improves detection speed; and test tools are simple and have low cost and favorable service value.
Description
Technical field
The present invention relates to a kind of LED power panel method of testing, be applicable to the display and the TV of LED-backlit.
Background technology
Existing LED power panel test is the LED power panel to be connected with the LED-backlit plate test, and the LED-backlit plate has a plurality of LED stripe-arrangement, is called Light bar.Light bar is made of x string y and LED.For example: 12 string 8 and Light bar, be made of 12 LED of every row, 8*12=96 LED altogether 8 row LED.When test, the tester need detect the electric current of every Light bar, then current value and standard value is compared, if which bar loop current value not in critical field, illustrates then to break down in which loop in the LED power panel, promptly handles as defective products.This method of testing need manually be carried out, and not only make mistakes easily, and required testing apparatus is many cost height.
Summary of the invention
In view of the deficiency of above-mentioned technology, the purpose of this invention is to provide a kind of LED power panel method of testing, this method has been simplified LED power panel testing process, has improved detection speed.
The present invention is achieved in that a kind of LED power panel method of testing, comprise LED power panel to be measured and be used to detect the whether qualified LED-backlit plate of LED power panel, it is characterized in that: during described LED power panel to be measured and LED-backlit plate joint detection, serial connection one sample resistance on LED power panel power supply output bus, utilize a voltage detecting circuit to detect the magnitude of voltage at described sampling resistor two ends, send test board analysis to, handle, judge whether described LED power panel is qualified.
The present invention is by increasing a sample resistance at LED-backlit plate feeder ear, only need test the voltage at sample resistance two ends during test, just can confirm whether the power panel power supply is normal, changed loaded down with trivial details in the past detection mode, saved equipment, and can realize having realized semi-automatic detection that intuitive display has better use value by test board.
Description of drawings
Fig. 1 is a test philosophy block diagram of the present invention.
Embodiment
The present invention will be further described below in conjunction with drawings and Examples.
According to existing method of testing, one group of output of described LED power panel, a Light bar is given in power supply.With 12 strings 8 and be example: the electric current of every row LED is generally 20mA, one group of power supply of power panel total current I always be 160mA (I always=I1+I2+ ... I8).If wherein there is problem in a row LED loop, then the feeder ear electric current changes 20mA, for example increase by one 5 ohm sample resistance R1 at the LED feeder ear, sample resistance R1 both end voltage just changes 100mV, the magnitude of voltage at the sample resistance R1 two ends that voltage table is measured, be sent to tester table single-chip microcomputer and preset value relatively, board just can judge automatically whether Light bar power supply is normal.
According to above-mentioned principle, the invention provides a kind of LED power panel method of testing, comprise LED power panel to be measured and be used to detect the whether qualified LED-backlit plate of LED power panel, it is characterized in that: during described LED power panel to be measured and LED-backlit plate joint detection, serial connection one sample resistance on LED power panel power supply output bus, utilize a voltage detecting circuit to detect the magnitude of voltage at described sampling resistor two ends, send test board analysis to, handle, judge whether described LED power panel is qualified.
In a preferred embodiment of the present invention, described voltage detecting circuit is a voltage table, and the resistance of sampling resistor can be got not the LED power panel is produced bigger load, and this sampling resistor is 5 ohm in the present embodiment.This scheme feasibility assessment is as follows:
(1), during operate as normal 5 ohm of sample resistance R1 to go up the power that consume be P=0.16A*0.16A*5 Ω=0.1328W, can not increase the power panel load.
(2), the error of production line test board can be controlled in 5%.So the voltage U scope at on-gauge plate sample resistance R1 two ends is: 800 ± 40mV (the total * R1 of U=I).If wherein there is problem in a row LED loop, sample resistance R1 both end voltage just changes 80mV (100mV deducts the 20mV error); If there is problem in y row LED loop, sample resistance R1 both end voltage just changes 80mV*y, has exceeded 800 ± 40mV scope, so bad plate can be surveyed.
The above only is preferred embodiment of the present invention, and all equalizations of being done according to the present patent application claim change and modify, and all should belong to covering scope of the present invention.
Claims (3)
1. LED power panel method of testing, comprise LED power panel to be measured and be used to detect the whether qualified LED-backlit plate of LED power panel, it is characterized in that: during described LED power panel to be measured and LED-backlit plate joint detection, serial connection one sample resistance on LED power panel power supply output bus, utilize a voltage detecting circuit to detect the magnitude of voltage at described sampling resistor two ends, send test board analysis to, handle, judge whether described LED power panel is qualified.
2. LED power panel method of testing according to claim 1 is characterized in that: described voltage detecting circuit is a voltage table.
3. LED power panel method of testing according to claim 1 is characterized in that: the resistance of described sampling resistor is 5 ohm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010300752A CN101762761A (en) | 2010-01-26 | 2010-01-26 | Test method for LED power board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010300752A CN101762761A (en) | 2010-01-26 | 2010-01-26 | Test method for LED power board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101762761A true CN101762761A (en) | 2010-06-30 |
Family
ID=42494050
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010300752A Pending CN101762761A (en) | 2010-01-26 | 2010-01-26 | Test method for LED power board |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101762761A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102692594A (en) * | 2011-03-21 | 2012-09-26 | 海洋王照明科技股份有限公司 | Tool and method for testing constant current of LED drive board |
| CN103048583A (en) * | 2012-12-27 | 2013-04-17 | 深圳市九洲电器有限公司 | Detection device and method of LED (Light Emitting Diode) nixie tube |
-
2010
- 2010-01-26 CN CN201010300752A patent/CN101762761A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102692594A (en) * | 2011-03-21 | 2012-09-26 | 海洋王照明科技股份有限公司 | Tool and method for testing constant current of LED drive board |
| CN102692594B (en) * | 2011-03-21 | 2015-09-23 | 海洋王照明科技股份有限公司 | Constant current of LED drive board test fixture and method of testing thereof |
| CN103048583A (en) * | 2012-12-27 | 2013-04-17 | 深圳市九洲电器有限公司 | Detection device and method of LED (Light Emitting Diode) nixie tube |
| CN103048583B (en) * | 2012-12-27 | 2015-12-23 | 深圳市九洲电器有限公司 | A kind of LED charactron pick-up unit and method |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Open date: 20100630 |