CN103926500B - The method realizing the detection of constant current driver circuit for LED performance - Google Patents
The method realizing the detection of constant current driver circuit for LED performance Download PDFInfo
- Publication number
- CN103926500B CN103926500B CN201410161724.4A CN201410161724A CN103926500B CN 103926500 B CN103926500 B CN 103926500B CN 201410161724 A CN201410161724 A CN 201410161724A CN 103926500 B CN103926500 B CN 103926500B
- Authority
- CN
- China
- Prior art keywords
- led
- driver circuit
- constant current
- current value
- current driver
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 27
- 230000004888 barrier function Effects 0.000 claims description 2
- 238000012360 testing method Methods 0.000 abstract description 18
- 230000003287 optical effect Effects 0.000 abstract description 6
- 238000010276 construction Methods 0.000 abstract description 2
- 230000002950 deficient Effects 0.000 abstract 1
- 239000000835 fiber Substances 0.000 abstract 1
- 238000010998 test method Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
Landscapes
- Led Devices (AREA)
Abstract
The present invention relates to a kind of method realizing the detection of constant current driver circuit for LED performance, it is characterized by use low-voltage and two kinds of input voltages of normal voltage to carry out test loop current value, low-voltage is so that minimum voltage value when LED just starts working in described constant current driver circuit for LED, normal voltage is all LED voltage when normally working, detection output electric current in the case of both input voltages, and compare with correct current value range respectively, if in correct current value range, then output products is qualified, printed product label；Otherwise, output products is defective.Have employed the method realizing the detection of constant current driver circuit for LED performance of the present invention, utilize electrical property rather than optical detection to test, add the degree of accuracy of test and the speed of test；Meanwhile, the present invention uses simplest programmable power supply able to programme, it is not necessary to Fibre Optical Sensor and photoconductive resistance, it is not required that increase extra equipment, and simple in construction is with low cost, easy to operate, has wide range of applications.
Description
Technical field
The present invention relates to circuit measuring technical field, particularly to LED performance measurement technical field, specifically refer to a kind of realization
The method of constant current driver circuit for LED performance detection.
Background technology
LED has the advantages such as life-span length, brightness is high, low in energy consumption, volume is little, is widely used in automotive field, as steering indicating light,
Light, headlamp, fog lamp etc..Common LED type of drive has resistance current limliting, constant-current driving, switched mode converter to drive
Deng.
Resistance current limliting scheme is usually used in inefficient application scenario, so, the part of wide input voltage range high to efficiency requirements
The method is not used on automotive lighting；Switched mode converter drive circuit, although have that circuit topology is flexible, efficiency is high and input
The characteristic that voltage is wide, but because EMC is required particularly severe by it, automotive lighting is not made preferred version；Constant-current driving can make
LED operation is unlikely to burn out under specific electric current, and luminous intensity is constant in the range of certain voltage, it is simple to use, should
With wider.
As shown in figs. 34, the circuit performance test driven for LED constant current, common are now two kinds of method of testings:
1, test vehicle body normal working voltage VnormalLoop current under=13.5V input condition.The defect of this method of testing is,
When LED short circuit, VnormalUnder input, loop current is still within normal range.
2, while detection LED loop current, increase optical sensor or photoconductive resistance, detect VnormalThe lower LED of input
Brightness.Although it is the most short-circuit that this kind of method of testing can detect LED, but affected relatively big, for plurality of LEDs position by ambient light
Put Relatively centralized situation, the most difficult to a wherein LEDs short detection, and equipment cost input is the biggest.
Summary of the invention
The technical problem to be solved is the shortcoming overcoming above-mentioned prior art, it is provided that two kinds of input voltages of a kind of employing
Come respectively measure loop electric current, increase measuring accuracy and test speed, utilize programmable power supply, reduce cost, simple in construction, behaviour
Make the method realizing the detection of constant current driver circuit for LED performance convenient, that have wide range of applications.
To achieve these goals, the invention provides the method realizing the detection of constant current driver circuit for LED performance, there is following structure
Become:
This realizes the method for constant current driver circuit for LED performance detection, and it is mainly characterized by, and described method comprises the following steps:
(1) the first loop current value of constant current driver circuit for LED will be detected after normal voltage input to constant current driver circuit for LED
And in the circuit described in the judgement of correct current value range result of the comparison under inputting with normal voltage according to this first loop current value
Whether there is open fault, described normal voltage is equal to when in described constant current driver circuit for LED, all LED normally work
Voltage；
(2) low-voltage input is detected the second servo loop current value of constant current driver circuit for LED also to constant current driver circuit for LED
According in the circuit described in the correct current value range result of the comparison judgement that the input of this second servo loop current value and low-voltage is lower whether
There is short trouble.
Described inputs normal voltage to constant current driver circuit for LED, particularly as follows:
By programmable power supply to described constant current driver circuit for LED input normal voltage.
Described the first loop current by detecting constant current driver circuit for LED after normal voltage input to constant current driver circuit for LED
Value, comprises the following steps:
(11) by described normal voltage input to described constant current driver circuit for LED；
(12) by ammeter read described in the first loop current value of constant current driver circuit for LED.
Described judges described according to this first loop current value with the correct current value range result of the comparison under normal voltage input
Circuit in whether there is open fault, comprise the following steps:
(13) compared with the correct current value range under the first described loop current value and normal voltage being inputted, if described the
The correct current value range that primary Ioops current value belongs under normal voltage input then continues step (2), otherwise continues step (14)；
(14) the first loop current value described in record record this constant current driver circuit for LED and there is open fault.
Described inputs low-voltage to constant current driver circuit for LED, particularly as follows:
By programmable power supply to described constant current driver circuit for LED input low-voltage.
The described second servo loop current value by detecting constant current driver circuit for LED after low-voltage input to constant current driver circuit for LED,
Comprise the following steps:
(21) by described low-voltage input to described constant current driver circuit for LED；
(22) by ammeter read described in the second servo loop current value of constant current driver circuit for LED.
Described in the described correct current value range result of the comparison judgement lower with low-voltage input according to this second servo loop current value
Whether circuit exists short trouble, comprises the following steps:
(23) compared with the correct current value range under described second servo loop current value being inputted with low-voltage, if described second
The correct current value range that loop current value belongs under low-voltage input then continues step (25), otherwise continues step (24)；
(24) second servo loop current value described in record record this constant current driver circuit for LED and there is short trouble；
(25) second servo loop current value described in record and record this constant current driver circuit for LED there is not open fault and short circuit therefore
Barrier.
Have employed the method realizing the detection of constant current driver circuit for LED performance of the present invention, compared with prior art, having following has
Benefit effect:
The present invention utilizes electrical property to judge to replace optical detection, simple and convenient, improves work efficiency, solves in test process
Because judging problem produced by ambient light by accident, add accurate testing degree and test speed, just improve production efficiency and Product checking
Really rate, decreases the outflow of bad product；The present invention utilizes simple programmable programmable power supply to realize, and need not increase extra
Equipment, eliminates the light sensor component of costliness, reduces test equipment and taken up space, reduce cost, have wide range of applications.
Accompanying drawing explanation
Fig. 1 is that in prior art, discrete component builds constant current driver circuit for LED structural representation.
Fig. 2 is that in prior art, constant-current driven chip realizes constant current driver circuit for LED structural representation.
Fig. 3 is univoltage test constant current driver circuit for LED performance detecting step flow chart in prior art.
Fig. 4 is to use voltage tester to combine optical sensor or the constant current driver circuit for LED performance of photoconductive resistance detection in prior art
Detecting step flow chart.
Fig. 5 is the flow chart of steps of the method realizing the detection of constant current driver circuit for LED performance of the present invention.
Detailed description of the invention
In order to more clearly describe the technology contents of the present invention, conduct further description below in conjunction with specific embodiment.
The invention provides a kind of method realizing the detection of constant current driver circuit for LED performance, described method uses two kinds of voltages to survey
Examination: low-voltage and normal working voltage.In test process, add the electric performance test step of low-voltage, thus improve inspection
The precision surveyed, the present invention can quickly, effectively detect the failure mode of LED short circuit, and then improve the accuracy rate of detection.
Refer to shown in Fig. 5, for the flow chart of steps of the method realizing the detection of constant current driver circuit for LED performance of the present invention.
The present invention provides the method realizing the detection of constant current driver circuit for LED performance, is that constant current driver circuit for LED is producing assembling
The step of the Quality Detection carried out after completing, its method of testing is as follows:
Test two kinds of voltage input V0And VnormalLoop current under state: when circuit input voltage is V0(V0Approximate institute
Have the forward voltage drop sum of LED chip) time, LED glimmer or almost do not work, now the electric current in loop is the least, and about 1 arrives 10mA；
When circuit input voltage is VnormalTime, current value is normal.
Described low-voltage is so that minimum voltage value when LED just starts working in described constant current driver circuit for LED, i.e.
Need to overcome self inherent loss of its circuit.
Loop all LED forward voltage drop sum is less than or equal to 6V, and low-voltage approximates all LED forward voltage drop sums；Loop
All LED forward voltage drop sums are more than 6V, and low-voltage uses 6V test.
When a LEDs open circuit, V0Under voltage input, current value is normal；VnormalUnder voltage input, electric current drastically drops to
Below 10mA.
When a LEDs short circuit, V0Under voltage input, electric current is ten times of normal current value；VnormalUnder voltage input, electricity
Flow valuve is normal.
Realize the preferred version of method of constant current driver circuit for LED performance detection, specifically include following steps:
(1) programmable power supply is connected with constant current driver circuit for LED to be measured；
(2) programmable power supply described in is to described constant current driver circuit for LED to be measured input normal voltage Vnormal；
(3) loop current value I of the constant current driver circuit for LED to be measured described in ammeter reading1；
(4) loop current value I described in1Compare with normal current value scope [a, b], if I1Belong to [a, b], then continue step
(6) step (5), is otherwise continued；
(5) record I1Value and record this constant current driver circuit for LED and there is short trouble；
(6) record I1Value；
(7) programmable power supply described in is to described constant current driver circuit for LED to be measured input low-voltage V0；
(8) loop current value I of the constant current driver circuit for LED to be measured described in ammeter reading2；
(9) loop current value I described in2Compare with normal current value scope [c, d], if I1Belong to [c, d], then continue step
(11) step (10), is otherwise continued；
(10) record I2Value and record this constant current driver circuit for LED and there is open fault；
(11) record I2Value and record this constant current driver circuit for LED and there is not open fault and short trouble.
Have employed the method realizing the detection of constant current driver circuit for LED performance of the present invention, compared with prior art, having following has
Benefit effect:
The present invention utilizes electrical property to judge to replace optical detection, simple and convenient, improves work efficiency, solves in test process
Because judging problem produced by ambient light by accident, add accurate testing degree and test speed, just improve production efficiency and Product checking
Really rate, decreases the outflow of bad product；The present invention utilizes simple programmable programmable power supply to realize, and need not increase extra
Equipment, eliminates the light sensor component of costliness, reduces test equipment and taken up space, reduce cost, have wide range of applications.
In this description, the present invention is described with reference to its specific embodiment.But it is clear that still may be made that various
Amendment and conversion are without departing from the spirit and scope of the present invention.Therefore, specification and drawings is considered as illustrative rather than limits
Property processed.
Claims (5)
1. the method realizing the detection of constant current driver circuit for LED performance, it is characterised in that described method includes following step
Rapid:
(1) the first loop current value of constant current driver circuit for LED will be detected after normal voltage input to constant current driver circuit for LED
And in the circuit described in the judgement of correct current value range result of the comparison under inputting with normal voltage according to this first loop current value
Whether there is open fault, described normal voltage is equal to when in described constant current driver circuit for LED, all LED normally work
Voltage；
Described judges described according to this first loop current value with the correct current value range result of the comparison under normal voltage input
Circuit in whether there is open fault, comprise the following steps:
(13) compared with the correct current value range under the first described loop current value and normal voltage being inputted, if described the
Primary Ioops current value belongs to the correct current value range under normal voltage input, then continue step (2), otherwise continue step (14)；
(14) the first loop current value described in record record this constant current driver circuit for LED and there is open fault；
(2) low-voltage input is detected the second servo loop current value of constant current driver circuit for LED also to constant current driver circuit for LED
According in the circuit described in the correct current value range result of the comparison judgement that the input of this second servo loop current value and low-voltage is lower whether
There is short trouble, described low-voltage is minimum so that when LED just starts working in described constant current driver circuit for LED
Magnitude of voltage；
Described in the described correct current value range result of the comparison judgement lower with low-voltage input according to this second servo loop current value
Whether circuit exists short trouble, comprises the following steps:
(23) compared with the correct current value range under described second servo loop current value being inputted with low-voltage, if described second
Loop current value belongs to the correct current value range under low-voltage input, then continue step (25), otherwise continue step (24)；
(24) second servo loop current value described in record record this constant current driver circuit for LED and there is short trouble；
(25) second servo loop current value described in record and record this constant current driver circuit for LED there is not open fault and short circuit therefore
Barrier.
The method realizing the detection of constant current driver circuit for LED performance the most according to claim 1, it is characterised in that described
By normal voltage input to constant current driver circuit for LED, particularly as follows:
By programmable power supply to described constant current driver circuit for LED input normal voltage.
The method realizing the detection of constant current driver circuit for LED performance the most according to claim 1 and 2, it is characterised in that
Described the first loop current value by detecting constant current driver circuit for LED after normal voltage input to constant current driver circuit for LED,
Comprise the following steps:
(11) by described normal voltage input to described constant current driver circuit for LED；
(12) by ammeter read described in the first loop current value of constant current driver circuit for LED.
The method realizing the detection of constant current driver circuit for LED performance the most according to claim 1, it is characterised in that described
By low-voltage input to constant current driver circuit for LED, particularly as follows:
By programmable power supply to described constant current driver circuit for LED input low-voltage.
5. according to the method realizing the detection of constant current driver circuit for LED performance described in claim 1 or 4, it is characterised in that
The described second servo loop current value by detecting constant current driver circuit for LED after low-voltage input to constant current driver circuit for LED, bag
Include following steps:
(21) by described low-voltage input to described constant current driver circuit for LED；
(22) by ammeter read described in the second servo loop current value of constant current driver circuit for LED.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410161724.4A CN103926500B (en) | 2014-04-22 | 2014-04-22 | The method realizing the detection of constant current driver circuit for LED performance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410161724.4A CN103926500B (en) | 2014-04-22 | 2014-04-22 | The method realizing the detection of constant current driver circuit for LED performance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103926500A CN103926500A (en) | 2014-07-16 |
| CN103926500B true CN103926500B (en) | 2016-08-24 |
Family
ID=51144793
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410161724.4A Expired - Fee Related CN103926500B (en) | 2014-04-22 | 2014-04-22 | The method realizing the detection of constant current driver circuit for LED performance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103926500B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105974292A (en) * | 2016-06-20 | 2016-09-28 | 刘成 | LED module electric leakage testing method |
| CN106771725A (en) * | 2016-12-02 | 2017-05-31 | 上海华测导航技术股份有限公司 | The test system of a kind of electronic equipment |
| CN107091981A (en) * | 2017-06-15 | 2017-08-25 | 深圳市沃特沃德股份有限公司 | Indicator lamp controls the test system of drive circuit |
| CN109142930B (en) * | 2018-09-02 | 2021-03-12 | 华域视觉科技(上海)有限公司 | Design verification method for LED driving module of headlamp |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101340762A (en) * | 2008-08-18 | 2009-01-07 | 友达光电股份有限公司 | Lamp tube detection and driving system and related detection and driving method |
| CN201654157U (en) * | 2010-01-04 | 2010-11-24 | 上海贝岭股份有限公司 | A fault detection device for LED driving circuit |
| CN201700036U (en) * | 2010-04-27 | 2011-01-05 | 英飞特电子（杭州）有限公司 | Protection circuit for open circuit |
| CN202907296U (en) * | 2012-10-31 | 2013-04-24 | 常州市五一灯具有限公司 | Automobile high-power LED drive circuit |
| CN103116139A (en) * | 2013-01-23 | 2013-05-22 | 重庆恒又源科技发展有限公司 | Detection method, detection device and detection system of street lamp failure |
| CN103347352A (en) * | 2013-07-11 | 2013-10-09 | 青岛海信电器股份有限公司 | LED light source short-circuit detection method and device, LED backlight and liquid crystal display device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4952292B2 (en) * | 2007-02-21 | 2012-06-13 | 東芝ライテック株式会社 | LED lighting device and lighting device system |
-
2014
- 2014-04-22 CN CN201410161724.4A patent/CN103926500B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101340762A (en) * | 2008-08-18 | 2009-01-07 | 友达光电股份有限公司 | Lamp tube detection and driving system and related detection and driving method |
| CN201654157U (en) * | 2010-01-04 | 2010-11-24 | 上海贝岭股份有限公司 | A fault detection device for LED driving circuit |
| CN201700036U (en) * | 2010-04-27 | 2011-01-05 | 英飞特电子（杭州）有限公司 | Protection circuit for open circuit |
| CN202907296U (en) * | 2012-10-31 | 2013-04-24 | 常州市五一灯具有限公司 | Automobile high-power LED drive circuit |
| CN103116139A (en) * | 2013-01-23 | 2013-05-22 | 重庆恒又源科技发展有限公司 | Detection method, detection device and detection system of street lamp failure |
| CN103347352A (en) * | 2013-07-11 | 2013-10-09 | 青岛海信电器股份有限公司 | LED light source short-circuit detection method and device, LED backlight and liquid crystal display device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103926500A (en) | 2014-07-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103926500B (en) | The method realizing the detection of constant current driver circuit for LED performance | |
| CN204086505U (en) | A kind of LED lamp intelligence aging testing system | |
| US8493055B2 (en) | Voltage measurement apparatus | |
| CN103364709A (en) | Functional circuit test system and method for printed circuit board assembly | |
| CN102141595A (en) | Operation method of alternating current light-emitting diode | |
| CN110118911B (en) | USBC cable test circuit | |
| CN104459604A (en) | Automatic tester applied to intelligent ammeter production line | |
| CN104345285A (en) | Energy-saving power adapter ageing testing device | |
| CN102455402B (en) | Rectifier bridge detector | |
| CN210572674U (en) | Voltage sampling channel leakage current detection equipment for serial battery module cell | |
| CN205861871U (en) | A kind of fault detection system for high frequency switch power | |
| US9728953B2 (en) | Fault detection circuit and fault detection method | |
| CN101806871B (en) | A kind of online test method | |
| JP2017220965A (en) | Solar cell inspection device and solar cell inspection method | |
| KR101817519B1 (en) | Solenoid check apparatus and check method thereof | |
| CN201196673Y (en) | Multifunctional DC pen | |
| CN204177856U (en) | Auto repair detects with examination lamp | |
| CN217132525U (en) | Lens detection circuit and lens detection device | |
| TWI388864B (en) | Light bar detection method and the detection machine | |
| CN117214642A (en) | Thermoelectric semiconductor multichannel check out test set | |
| CN201548649U (en) | Single board test tool | |
| CN210835095U (en) | Fault detection circuit of automobile EPS system | |
| CN202393889U (en) | Rapid electric quantity measurement system for electric car | |
| CN101738564A (en) | Memory slot detector | |
| CN205809184U (en) | Simple pulse polarity tester |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160824 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |