CN204836752U - A failure detector circuit for establishing ties LED cluster - Google Patents
A failure detector circuit for establishing ties LED cluster Download PDFInfo
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- CN204836752U CN204836752U CN201520488160.5U CN201520488160U CN204836752U CN 204836752 U CN204836752 U CN 204836752U CN 201520488160 U CN201520488160 U CN 201520488160U CN 204836752 U CN204836752 U CN 204836752U
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Abstract
The utility model provides a failure detector circuit for establishing ties LED cluster connects and to go here and there both ends at a LED who is connected with a drive power supply, the LED cluster is including n LED lamp, wherein n> 1, failure detector circuit still includes: a voltage sample unit, the 2nd voltage sample unit, processing unit and report an emergency and ask for help or increased vigilance the unit, a voltage sample unit is connected with the positive negative pole of drive power supply, and the total voltage U who detects the LED cluster is total to always send total voltage U to processing unit, the voltage uled of single LED lamp is detected at the both ends of the arbitrary LED lamp of the 2nd voltage sample unit connection in a n LED lamp to send voltage uled to processing unit, processing unit relatively total and the nUled's of total voltage U size to confirm according to the comparative result whether needs output alarm command is to reporting an emergency and asking for help or increased vigilance the unit, report an emergency and ask for help or increased vigilance the unit basis alarm command sends the warning signal. After adopting above -mentioned technical scheme, utilize simple circuit can to detect and diagnose the high and low cost of correct rate to each kind trouble that series connection LED cluster takes place.
Description
Technical field
The utility model relates to light fixture optical property detection field, particularly relates to a kind of failure detector circuit for series LED string.
Background technology
Along with development and the requirement of green low-carbon lighting technology, LED replaces conventional light source just more and more and has been applied in various lighting.Wherein series LED lamp string, because the drive current of each LED is equal, wherein the luminosity of each LED and other optical index can keep identical, and then ensure that the uniformity of optical system luminescence, consistency.Also manufacturing and designing of other optics is greatly facilitated.Series LED lamp string is extensively present in various LED illumination lamp thus.But what use along with LED string increases, and its failure rate also correspondingly improves, and the common failure pattern of LED is divided into open failure and short-circuit failure.No matter which kind of failure mode all can produce adverse influence to the illumination of LED.In particular technology area, such as car light industry, because car light is active safety parts, has strict demand to the optical property of light fixture.The international standard of car light requires when LED lost efficacy, or turns off whole lamp, or maintains the minimum performance requirement of industry standard.This just requires effectively to diagnose the open circuit of LED and short circuit.
As previously described, the fault of current LED is generally open circuit or short trouble, when LED opens a way because circuit is in open-circuit condition, LED does not have electric current flow through, thus the open circuit diagnosis of LED main adopt to detect electric current or carry out open circuit by the method that sampling resistor detects electric current diagnose.For the short trouble of LED, because LED is current driving apparatus, no matter whether have short circuit in LED string, the electric current on whole lamp string all can not change, so conventional sense means cannot carry out effective short-circuit failure diagnosis.
Therefore, need a kind of simple and effective LED strip fault detection method, all can accurate diagnosis and detection for the open fault of LED and short trouble.
Utility model content
In order to overcome above-mentioned technological deficiency, the purpose of this utility model is to provide a kind of failure detector circuit for series LED string, adopts the fault detect of simple circuit realiration LED strip.
The utility model discloses a kind of failure detector circuit for series LED string, be connected to the LED strip two ends be connected with a driving power, described LED strip comprises n LED, wherein n>1, described failure detector circuit also comprises: the first voltage sampling unit, the second voltage sampling unit, processing unit and Alarm Unit; Described first voltage sampling unit is connected to the both positive and negative polarity of described driving power, detects the total voltage U of described LED strip
always, and by described total voltage U
alwaysbe sent to described processing unit; Described second voltage sampling unit is connected to the two ends of the arbitrary LED in a described n LED, detects the voltage U of described LED
led, and by described voltage U
ledbe sent to described processing unit; The more described total voltage U of described processing unit
alwayswith n*U
ledsize, and determine whether to need outputting alarm instruction to described Alarm Unit according to comparative result; Described Alarm Unit sends alarm signal according to described alarm command.
Preferably, the comparative result of described processing unit is described total voltage U
alwaysequal described n*U
ledtime, the not outputting alarm instruction of described processing unit.
Preferably, the comparative result of described processing unit is described total voltage U
alwaysbe less than described n*U
led, described U
alwaysbe not equal to described U
ledand described U
alwayswith described U
ledwhen not being 0, or as described U
ledclose to 0, and described total voltage U
alwayswhen being not equal to 0, described processing unit exports a short circuit alarm command.
Preferably, the comparative result of described processing unit is described total voltage U
alwaysbe greater than described n*U
led,and U
ledwhen equaling 0, or as described U
ledequal described total voltage U
always, and described U
alwayswith described U
ledwhen being not equal to 0, described processing unit exports an open circuit alarm command.
Preferably, described processing unit comprises hysteresis loop comparator or microprocessor, for more described U
alwayswith described n*U
led.
Preferably, described hysteresis loop comparator has a tolerance limit, as described U
alwaysand/or n*U
ledwhen being greater than described tolerance limit, the instruction of described processing unit outputting alarm.
Preferably, described first voltage sampling unit and the second voltage sampling unit comprise operational amplifier and analog and digital circuit.
Preferably, described first voltage sampling unit and the second voltage sampling unit also comprise signal conditioning circuit, are connected with described analog and digital circuit.
Preferably, described Alarm Unit comprises and exports the digital circuit of described alarm signal by circuit or exported the microprocessor of described alarm signal by communication mode.
Preferably, described LED strip comprises the multiple LED connected by least one road.
After have employed technique scheme, compared with prior art, there is following beneficial effect:
1. no matter be the LED short/open detected, or the LED short/open do not detected, all exportable alarm model of failure detector circuit of the present utility model;
2. testing circuit structure is simple;
3. system robustness is better.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the failure detector circuit meeting the utility model one preferred embodiment.
Embodiment
Advantage of the present utility model is set forth further below in conjunction with accompanying drawing and specific embodiment.
Due in side circuit application, be in the occupation mode of each LED in same series via, nature parameters, aging characteristics and temperature characterisitic basically identical, therefore, a LEDs can be used as benchmark to judge the operating state of whole LED strip.Therefore, in the utility model, consult Fig. 1, failure detector circuit is connected to the two ends of a LED strip, and wherein this LED strip is formed (n>1) by n LED strip connection, and a driving power is connected to the two ends of LED strip, for inputting electric energy.In order to the fault possible to LED strip detects, failure detector circuit also includes the first voltage sampling unit and the second voltage sampling unit that are used as to sample to LED strip, this the first sampling unit is connected to the both positive and negative polarity of driving power, thus the total voltage U that the electric current that each LED strip is flow through in detection is formed
always, the second voltage sampling unit is connected to the two ends of any one LED, then the sampling of this second voltage sampling unit is the voltage U of a certain LED in LED strip
led, obtaining two different sampled value U
alwaysand U
ledafter, the first voltage sampling unit and the second voltage sampling unit are all connected to a processing unit, and this processing unit will receive above-mentioned sampled voltage U
alwaysand U
led, before above-mentioned two magnitudes of voltage of processing unit processes, store the total quantity of the LED comprised in LED strip in it, i.e. said n value.Processing unit will compare total voltage U
alwaysand n*U
ledmagnitude relationship, to judge whether LED strip has fault, and according to different failure conditions, there is different alarm commands.
Be understandable that, under LED strip normally works, U
ledu should be less than
always, but when breaking down, U
ledwith U
alwaysbetween relation change by different failure conditions.Particularly, total voltage U
alwayswith n*U
ledbetween relation comprise following several, each all corresponding different circuit state.
1. U
always=n*U
led
Each LED in LED strip normally works, due to the character of series circuit, the total voltage value that each identical LED is assigned to is all identical, i.e. U
always÷ n=U
led.So, when comparative result is U
always=n*U
ledtime, illustrate that LED strip normally works, processing unit can not send alarm command.One skilled in the art will appreciate that the character of each LED above-mentioned is all perfect condition mutually, more difficultly in actual applications reach this perfect condition, thus, in reality detects, U
alwaysgenerally can not with n*U
ledidentical, but difference between the two should be not larger.
2. U
always< n*U
led, and U
ledbe not equal to U
always
When a certain LED do not sampled by this second voltage sampling unit is short-circuited fault, known, total effectively LED quantity of whole LED strip will reduce, thus cause U
alwaysless than voltage during normal work, therefore, this fault makes n*U
ledvalue be greater than U
always, when processing unit compares U
alwayswith n*U
ledthe result of value be U
always< n*U
ledtime, and U
ledbe not equal to U
alwaystime can be judged as a certain or some LED short circuit, thus output short-circuit alarm command.
3. U
led≈ 0, and U
always≠ 0 declines simultaneously slightly
When the LED sampled by this second voltage sampling unit is short-circuited fault, known, the LED of this short circuit can be considered wire, and the voltage at wire two ends equals 0 or close to 0, therefore, and n*U
ledvalue also should equal 0 or close to 0, but now total LED electrical pressure U of sampling of the first sampling unit
alwayscan be declined the voltage of a LED, but total voltage is not 0.So now, U
always> n*U
led, and U
alwaysbe not 0.This kind of situation simplifies judgement and is: U
led≈ 0, and U
always≠ 0.Thus judge this LED short circuit that the second voltage sampling unit connects, output short-circuit alarm command according to above-mentioned information.
4. U
always> n*U
led, and U
ledclose to 0
When open fault occurs a certain LED do not sampled by this second voltage sampling unit, known, whole LED strip is off state, does not have electric current in LED strip, the output voltage of what the first voltage sampling unit collected is LED driver.The voltage at LED two ends of then being sampled by the second voltage sampling unit equals 0 or close to 0, therefore, and U
alwaysvalue will be greater than n*U
led.Processing unit judges the LED open circuit of the second sampling unit sampling according to above-mentioned information, output open circuit alarm command.
5. U
always< n*U
led, but U
ledequal U
always.
When open fault occurs the LED sampled by the second sampling unit, because LED path interrupts, the voltage acquired by two sampling units is U
always, the namely driving voltage of LED driver.Now can output open circuit alarm command.It is U that this kind of situation can simplify determination methods
always=U
led, i.e. U
always< n*U
led, and U
alwaysand U
ledbe not all 0.
Can find out from above-mentioned different failure condition, the fault of the LED strip of any kind has been encompassed in above all, there will not be situation that is undetected or false retrieval.
In above-mentioned situation, processing unit generates and the alarm command exported will be sent to an Alarm Unit be connected with processing unit, Alarm Unit is then according to different alarm commands, generate different alarm signals, there occurs fault to warn user's LED strip and there occurs which kind of fault.
It should be noted that because processing unit is at relatively U
alwaysand U
ledin time, needs together to judge together with n value, therefore, once the quantity n of LED changes in LED strip, needs in processing unit, together adjust this n value, to ensure the accuracy of comparative result.
In order to increase the stability of the utility model failure detector circuit, processing unit comprises hysteresis loop comparator or microprocessor, for more described U
alwayswith described n*U
led.Similarly, be set with a tolerance limit in hysteresis loop comparator, work as U
alwaysand/or n*U
ledwhen being greater than tolerance limit, processing unit too can outputting alarm instruction, runs to prevent failure detector circuit overburden.
And for the sampling of voltage, the sample circuit basic by such as operational amplifier, analog and digital circuit etc. realizes, also for ease of stability when increasing sampling and anti-interference, first voltage sampling unit also can comprise with the second voltage sampling unit the signal conditioning circuit be connected with analog and digital circuit, filtering is carried out to sampled signal, also or other have the circuit of anti-interference filtration and stabiloity compensation function.
On the other hand, the output form of the alarm signal of Alarm Unit also can according to operating mode variation.The alarm signal based on communication mode based on circuit mode alarm signal or microprocessor generation produced as digital circuit is all applicable in embodiment of the present utility model.
In addition, in the utility model any embodiment, the LED strip of indication can be independent LED strip, also can be the LED strip group of multiple LED strip series connection, all can detect the fault occurred by operational failure testing circuit.
Should be noted that, embodiment of the present utility model has preferably implementation, and not any type of restriction is done to the utility model, any person skilled in art of being familiar with may utilize the technology contents of above-mentioned announcement change or be modified to equivalent effective embodiment, in every case the content of technical solutions of the utility model is not departed from, the any amendment done above embodiment according to technical spirit of the present utility model or equivalent variations and modification, all still belong in the scope of technical solutions of the utility model.
Claims (10)
1., for a failure detector circuit for series LED string, be connected to the LED strip two ends be connected with a driving power, described LED strip comprises n LED, wherein n>1, it is characterized in that,
Described failure detector circuit also comprises: the first voltage sampling unit, the second voltage sampling unit, processing unit and Alarm Unit;
Described first voltage sampling unit is connected to the both positive and negative polarity of described driving power, detects the total voltage U of described LED strip
always, and by described total voltage U
alwaysbe sent to described processing unit;
Described second voltage sampling unit is connected to the two ends of the arbitrary LED in a described n LED, detects the voltage U of described LED
led, and by described voltage U
ledbe sent to described processing unit;
The more described total voltage U of described processing unit
alwayswith n*U
ledsize, and determine whether to need outputting alarm instruction to described Alarm Unit according to comparative result;
Described Alarm Unit sends alarm signal according to described alarm command.
2. failure detector circuit as claimed in claim 1, is characterized in that,
The comparative result of described processing unit is described total voltage U
alwaysequal described n*U
ledtime, the not outputting alarm instruction of described processing unit.
3. failure detector circuit as claimed in claim 1, is characterized in that,
The comparative result of described processing unit is described total voltage U
alwaysbe less than described n*U
led, described U
alwaysbe not equal to described U
ledand described U
alwayswith described U
ledwhen not being 0, or as described U
ledclose to 0, and described total voltage U
alwayswhen being not equal to 0, described processing unit exports a short circuit alarm command.
4. failure detector circuit as claimed in claim 1, is characterized in that,
The comparative result of described processing unit is described total voltage U
alwaysbe greater than described n*U
led, and U
ledwhen equaling 0, or as described U
ledequal described total voltage U
always, and described U
alwayswith described U
ledwhen being not equal to 0, described processing unit exports an open circuit alarm command.
5. failure detector circuit as claimed in claim 1, is characterized in that,
Described processing unit comprises hysteresis loop comparator or microprocessor, for more described U
alwayswith described n*U
led.
6. failure detector circuit as claimed in claim 5, is characterized in that,
Described hysteresis loop comparator has a tolerance limit, as described U
alwaysand/or n*U
ledwhen being greater than described tolerance limit, the instruction of described processing unit outputting alarm.
7. failure detector circuit as claimed in claim 1, is characterized in that,
Described first voltage sampling unit and the second voltage sampling unit comprise operational amplifier and analog and digital circuit.
8. failure detector circuit as claimed in claim 7, is characterized in that,
Described first voltage sampling unit and the second voltage sampling unit also comprise signal conditioning circuit, are connected with described analog and digital circuit.
9. failure detector circuit as claimed in claim 1, is characterized in that,
Described Alarm Unit comprises and exports the digital circuit of described alarm signal by circuit or exported the microprocessor of described alarm signal by communication mode.
10. failure detector circuit as claimed in claim 1, is characterized in that,
Described LED strip comprises the multiple LED connected by least one road.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520488160.5U CN204836752U (en) | 2015-07-08 | 2015-07-08 | A failure detector circuit for establishing ties LED cluster |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520488160.5U CN204836752U (en) | 2015-07-08 | 2015-07-08 | A failure detector circuit for establishing ties LED cluster |
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| Publication Number | Publication Date |
|---|---|
| CN204836752U true CN204836752U (en) | 2015-12-02 |
Family
ID=54694301
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520488160.5U Active CN204836752U (en) | 2015-07-08 | 2015-07-08 | A failure detector circuit for establishing ties LED cluster |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107454704A (en) * | 2016-05-31 | 2017-12-08 | 西门子瑞士有限公司 | Light crossing-signal |
| US9942971B2 (en) | 2016-08-15 | 2018-04-10 | Ford Global Technologies, Llc | Detecting outages in a LED lamp assembly |
| CN108802632A (en) * | 2018-05-24 | 2018-11-13 | 中车青岛四方机车车辆股份有限公司 | Fault detection method and device, fault detection system |
| CN111670369A (en) * | 2017-11-02 | 2020-09-15 | 英诺泰克公司 | LED lamp failure detection circuit and method |
| CN111736089A (en) * | 2019-03-20 | 2020-10-02 | 深圳市嘉力电气技术有限公司 | A UV-LED lamp bead energy compensation and lamp bead fault detection device and method |
| CN112032678A (en) * | 2020-09-02 | 2020-12-04 | 上海应用技术大学 | A LED lighting strip voltage distribution lamp holder |
| CN112269139A (en) * | 2020-10-14 | 2021-01-26 | 无锡友达电子有限公司 | Multi-path LED lamp fault detection device |
| CN114792499A (en) * | 2022-05-31 | 2022-07-26 | 闻泰通讯股份有限公司 | Method for detecting short circuit of lamp panel, computer equipment and computer readable storage medium |
| CN119068638A (en) * | 2024-09-05 | 2024-12-03 | 广东吕泉科技有限公司 | A high-precision fire emergency lamp light source fault detection alarm circuit |
| CN119277600A (en) * | 2024-12-06 | 2025-01-07 | 瓴芯电子科技(无锡)有限公司 | Fault detection device, method and electronic equipment |
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2015
- 2015-07-08 CN CN201520488160.5U patent/CN204836752U/en active Active
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107454704B (en) * | 2016-05-31 | 2020-04-03 | 西门子瑞士有限公司 | Light alarm |
| CN107454704A (en) * | 2016-05-31 | 2017-12-08 | 西门子瑞士有限公司 | Light crossing-signal |
| US10540885B2 (en) | 2016-05-31 | 2020-01-21 | Siemens Schweiz Ag | Fire alarm systems |
| US9942971B2 (en) | 2016-08-15 | 2018-04-10 | Ford Global Technologies, Llc | Detecting outages in a LED lamp assembly |
| RU2675723C1 (en) * | 2016-08-15 | 2018-12-24 | ФОРД ГЛОУБАЛ ТЕКНОЛОДЖИЗ, ЭлЭлСи | Lamp assembly for vehicles and corresponding vehicles (options) |
| CN111670369A (en) * | 2017-11-02 | 2020-09-15 | 英诺泰克公司 | LED lamp failure detection circuit and method |
| CN108802632A (en) * | 2018-05-24 | 2018-11-13 | 中车青岛四方机车车辆股份有限公司 | Fault detection method and device, fault detection system |
| CN111736089A (en) * | 2019-03-20 | 2020-10-02 | 深圳市嘉力电气技术有限公司 | A UV-LED lamp bead energy compensation and lamp bead fault detection device and method |
| CN111736089B (en) * | 2019-03-20 | 2025-01-21 | 深圳市嘉力电气技术有限公司 | A UV-LED lamp bead energy compensation and lamp bead fault detection device and method |
| CN112032678A (en) * | 2020-09-02 | 2020-12-04 | 上海应用技术大学 | A LED lighting strip voltage distribution lamp holder |
| CN112032678B (en) * | 2020-09-02 | 2022-07-01 | 上海应用技术大学 | A LED lighting strip voltage distribution lamp holder |
| CN112269139A (en) * | 2020-10-14 | 2021-01-26 | 无锡友达电子有限公司 | Multi-path LED lamp fault detection device |
| CN114792499A (en) * | 2022-05-31 | 2022-07-26 | 闻泰通讯股份有限公司 | Method for detecting short circuit of lamp panel, computer equipment and computer readable storage medium |
| CN119068638A (en) * | 2024-09-05 | 2024-12-03 | 广东吕泉科技有限公司 | A high-precision fire emergency lamp light source fault detection alarm circuit |
| CN119277600A (en) * | 2024-12-06 | 2025-01-07 | 瓴芯电子科技(无锡)有限公司 | Fault detection device, method and electronic equipment |
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