CN105137369A - LED string lamp operation state monitoring method and system - Google Patents
LED string lamp operation state monitoring method and system Download PDFInfo
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- CN105137369A CN105137369A CN201510660870.6A CN201510660870A CN105137369A CN 105137369 A CN105137369 A CN 105137369A CN 201510660870 A CN201510660870 A CN 201510660870A CN 105137369 A CN105137369 A CN 105137369A
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Abstract
The invention provides an LED string lamp operation state monitoring method and system. The device comprises a processor and LED string lamps. A power supply unit, a temperature sensor, a voltage measuring circuit and a current measuring circuit are respectively connected between the processor and the LED string lamps. The processor is also connected with a memory, input and output equipment and a timer respectively. Influence of current change, temperature change and time change on voltage is added in voltage detection so that judgment is more accurate in LED string lamp fault judgment.
Description
Technical field
The present invention relates to LED strip lamp monitoring technique field, particularly relate to a kind of method and system monitoring LED strip lamp running status.
Background technology
LED is as a kind of novel, and low-power consumption light source more and more receives an acclaim recently.In a lot of field all extensive application.But in some field as this block of aviation lighting has strict regulation for the brightness of illumination light: in some apparatuss, the brightness of light must reach minimum safe standard.Be exactly some other field in addition, often have client's regulation LED to need to reach some strength.Therefore we are necessary to know: in a concrete LED light source, whether do do are these just all working properly at light-emittingdiode or have how many to be working properly?
In the implementation of high-capacity LED general illumination, being supplied to the power-supply device quantity of light-emittingdiode suitable current to simplify circuit and minimizing, is all generally coupled together by light-emittingdiode list string.Therefore verify whether an independent light-emittingdiode normally works, the simplest mode provides suitable drive current then to monitor its both end voltage to it.But this mode is not with respect to the several factors that can affect light-emitting diodes bulk voltage.Two it is well known that the forward voltage of light-emittingdiode is very responsive for the drive current of its node temperature and use.Therefore obvious as those LED equitemperature changes being arranged on outdoor or aircraft exterior, the fluctuation range of such voltage will be larger.Same, little drive current variations also can cause forward voltage wide-amplitude fluctuation.In addition.The forward voltage of each light-emittingdiode also can be different because of individual difference under same drive current.If do not have extra measure process like this and think effective monitoring voltage, the light-emittingdiode quantity in string just will certainly be restricted.
A kind of method for supervising is also had to be use relatively to measure in LED strip.The voltage measured carries out relative comparison with the LED be directly connected, and determines whether that these LED are in the voltage range expected with this.Even so temperature variation and the change of normal LED forward voltage still limit LED quantity.If the shortcoming of this method be exactly the quantity of LED strip more than four, a large amount of electronic metering equipments will be needed
Summary of the invention
The first object of the present invention is to provide a kind of method monitoring LED strip lamp running status, the voltage change Vtime that calculating current changes voltage change Vtj that the voltage change Vfcalc, the temperature variation that cause cause, time variations causes, and combine the normal voltage Vcal detected, jointly judge whether LED strip lamp has fault, to judge rationally and precision is high.
The second object of the present invention is to provide a kind of system of the method according to above-mentioned monitoring LED strip lamp running status.
In order to realize the first object of the present invention, the present invention is achieved by the following technical solutions:
Monitor a method for LED strip lamp running status, comprise the following steps:
S1, a calibration current Ion is loaded to standard LED strip lamp, voltage Vcal, the electric current I cal of record LED strip lamp and temperature Tjcal, and obtain LED number LEDnums in the current-voltage curve of LED, temperature-voltage relationship coefficient T coef, forward voltage-time curve, LED strip lamp;
S2, LED strip lamp to be measured loaded to an electric current identical with calibration current Ion size, timer starts timing;
S3, the electric current I meas detecting LED strip lamp to be measured and voltage Vmeas;
S4, compare electric current I meas whether within Ical margin tolerance, if so, perform step S5, perform step S6 if not;
S5, termination fixing a breakdown;
The voltage change Vtime that S6, calculating current change voltage change Vtj that the voltage change Vfcalc, the temperature variation that cause cause, time variations causes;
S7, calculate LED strip lamp voltage value to be measured
Vpredicted＝Vcal+Vfcalc+Vtj+Vtime；
S8, calculate the voltage deviation of LED strip lamp to be measured
Verror＝Vpredicted-Vmeas；
S9, judge voltage deviation Verror whether within zone of reasonableness, if so, judge that LED strip lamp to be measured does not have fault, if not, judge that LED strip lamp to be measured breaks down.
Further, the concrete grammar obtaining the voltage change Vfcalc that curent change causes in described step S6 is:
S611, Imeas and current-voltage curve to be contrasted, obtain LED strip modulating voltage Vfmeas to be measured, Ical and current-voltage curve are contrasted, obtain LED strip modulating voltage Vfcal to be measured;
S612, calculate the voltage change that LED strip lamp to be measured causes by curent change
Vfcalc＝(Vfmeas-Vfcal)*LEDnums。
Further, the concrete grammar obtaining the voltage change Vtj that temperature variation causes in described step S6 is:
S621, detect LED strip lamp junction temperature Tjmeas to be measured;
S622, calculate the voltage change that LED strip lamp to be measured causes by temperature variation
Vtj＝[(Tjmeas-Tjcal)*Tcoef]*LEDnums。
Further, obtaining the concrete grammar changing the voltage change Vtime caused working time in described step S6 is:
S631, obtain the time cumulation variable Ttime obtained by timer;
S632, calculate LED strip lamp to be measured according to forward voltage-time curve and changed the voltage change caused by working time
Vtime＝Life(Ttime)*LEDnums。
Further, also calculate in LED strip lamp the LED number that lost efficacy in described step S14, computing formula is as follows:
NUMbad＝Verror/(Vpredicted/LEDnums)。
Further, in described step 15, by checking that the mode whether LED strip lamp has short circuit, open circuit or change LED gets rid of LED string fault.
Further, in described step S4, Ical margin tolerance is 20%.
Further, in described step S9, when Verror is within 12% of Vpredicted, judge that LED string does not have fault.
In order to realize the second object of the present invention,
A kind of system realizing the method for above-mentioned monitoring LED strip lamp running status, processor and LED strip lamp, be connected to power-supply unit, temperature sensor, tension measuring circuit, current measurement circuit between described processor and LED strip lamp, and described processor is also connected with internal memory, input-output device, timer respectively.
First the voltage Vcal of standard during LED strip lamp loading normalized current Ion is obtained, electric current I cal and temperature Tjcal, and obtain the various parameters of single led lamp, then electric current I meas is detected, judge whether exception, last calculating current changes the voltage change Vfcalc caused, the voltage change Vtj that temperature variation causes, the voltage change Vtime that time variations causes, thus LED strip lamp voltage value Vpredicted to be measured can be calculated, final calculating voltage deviate Verror, whether judge whether LED string has fault in the reasonable scope by detecting voltage deviation value.
The invention has the advantages that: owing to adding the impact on voltage of curent change, temperature variation and time variations when voltage detecting, so when judging LED strip lamp failure, it is more accurate to judge.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail:
Fig. 1 is the Method And Principle figure of the method for monitoring LED strip lamp running status of the present invention;
Fig. 2 is the structural representation of the system of monitoring LED strip lamp running status of the present invention.
Embodiment
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, below explanation and accompanying drawing are exemplary for the present invention, and should not be understood to limit the present invention.Following description describe numerous detail to understand the present invention to facilitate.But in some instances, details that is that know or routine is also undeclared, to meet the succinct requirement of instructions.
Consult shown in Fig. 1, a kind of method monitoring LED strip lamp running status, comprises the following steps:
S1, a calibration current Ion is loaded to standard LED strip lamp, voltage Vcal, the electric current I cal of record LED strip lamp and temperature Tjcal, and obtain LED number LEDnums in the current-voltage curve of LED, temperature-voltage relationship coefficient T coef, forward voltage-time curve, LED strip lamp; This step is for obtaining the call parameter for calculating Vfcalc, Vtj and Vtime.The calibration current size Ion being used to LED string is different according to the LED kind of composition LED strip.Single led design parameter can be obtained by LED manufacturer.
S2, LED strip lamp to be measured loaded to an electric current identical with calibration current Ion size, timer starts timing; State consistency when state during for LED strip lamp to be measured is detected and standard LED detected parameters.
S3, the electric current I meas detecting LED strip lamp to be measured and voltage Vmeas;
S4, compare electric current I meas whether within Ical margin tolerance, if so, perform step S5, perform step S6 if not; Preferably, Ical margin tolerance is 20%.What also can use according to different LED or LED uses other margin tolerance when different occasions.
S5, termination fixing a breakdown; The situation that short circuit, short circuit or indivedual LED damage is had when also not using for preventing LED strip lamp.
The voltage change Vtime that S6, calculating current change voltage change Vtj that the voltage change Vfcalc, the temperature variation that cause cause, time variations causes;
S7, calculate LED strip lamp voltage value to be measured
Vpredicted＝Vcal+Vfcalc+Vtj+Vtime；
S8, calculate the voltage deviation of LED strip lamp to be measured
Verror＝Vpredicted-Vmeas；
S9, judge voltage deviation Verror whether within zone of reasonableness, if so, judge that LED strip lamp to be measured does not have fault, if not, judge that LED strip lamp to be measured breaks down.Preferably, judge that LED string does not have fault when Verror is within 12% of Vpredicted, what also can use according to different LED or LED uses other margin tolerance when different occasions.
Owing to adding the impact on voltage of curent change, temperature variation and time variations when voltage detecting, so when judging LED strip lamp failure, it is more accurate to judge.
And the method can be applied in the use procedure of whole LED strip lamp, detect in real time the service condition of LED strip lamp, and to break down at LED strip lamp be report to the police, namely after step S9 terminates, re-execute step S3.The operation of the detection LED strip lamp of continuous circulation.
Concrete, the concrete grammar obtaining the voltage change Vfcalc that curent change causes in step S6 is:
S611, Imeas and current-voltage curve to be contrasted, obtain LED strip modulating voltage Vfmeas to be measured, Ical and current-voltage curve are contrasted, obtain LED strip modulating voltage Vfcal to be measured;
S612, calculate the voltage change that LED strip lamp to be measured causes by curent change
Vfcalc＝(Vfmeas-Vfcal)*LEDnums。
The concrete grammar obtaining the voltage change Vtj that temperature variation causes in step S6 is:
S621, detect LED strip lamp junction temperature Tjmeas to be measured;
S622, calculate the voltage change that LED strip lamp to be measured causes by temperature variation
Vtj＝[(Tjmeas-Tjcal)*Tcoef]*LEDnums。
Obtaining the concrete grammar changing the voltage change Vtime caused working time in step S6 is:
S631, obtain the time cumulation variable Ttime obtained by timer;
S632, calculate LED strip lamp to be measured according to forward voltage-time curve and changed the voltage change caused by working time
Vtime＝Life(Ttime)*LEDnums。
Also calculate in LED strip lamp the LED number that lost efficacy in step S14, computing formula is as follows:
NUMbad＝Verror/(Vpredicted/LEDnums)。The LED number lost efficacy can be overhauled by input-output device output notice and store in order to follow-up use
In step 15, by checking that the mode whether LED strip lamp has short circuit, open circuit or change LED gets rid of LED string fault.
Consult shown in Fig. 2, a kind of system realizing said method, processor 1 and LED strip lamp 2, be connected to power-supply unit 3, temperature sensor 4, tension measuring circuit 5, current measurement circuit 6 between processor 1 and LED strip lamp 2, and processor 1 is also connected with internal memory 7, input-output device 8, timer 9 respectively.Processor 2 is for controlling the work of each unit, power-supply unit 3 is for powering for LED strip lamp 2, temperature sensor 4 is for detecting LED strip lamp junction temperature, tension measuring circuit 5 and current measurement circuit 6 are for measuring the voltage and current of LED strip lamp, and timing module is for recording the time of LED strip lamp 2 work.
It should be noted that above-described embodiment all can independent assortment as required.The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some omissions, improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (9)
1. monitor a method for LED strip lamp running status, it is characterized in that, comprise the following steps:
S1, a calibration current Ion is loaded to standard LED strip lamp, voltage Vcal, the electric current I cal of record LED strip lamp and temperature Tjcal, and obtain LED number LEDnums in the current-voltage curve of LED, temperature-voltage relationship coefficient T coef, forward voltage-time curve, LED strip lamp;
S2, LED strip lamp to be measured loaded to an electric current identical with calibration current Ion size, timer starts timing;
S3, the electric current I meas detecting LED strip lamp to be measured and voltage Vmeas;
S4, compare electric current I meas whether within Ical margin tolerance, if so, perform step S5, perform step S6 if not;
S5, termination fixing a breakdown;
The voltage change Vtime that S6, calculating current change voltage change Vtj that the voltage change Vfcalc, the temperature variation that cause cause, time variations causes;
S7, calculate LED strip lamp voltage value to be measured
Vpredicted＝Vcal+Vfcalc+Vtj+Vtime；
S8, calculate the voltage deviation of LED strip lamp to be measured
Verror＝Vpredicted-Vmeas；
S9, judge voltage deviation Verror whether within zone of reasonableness, if so, judge that LED strip lamp to be measured does not have fault, if not, judge that LED strip lamp to be measured breaks down.
2. the method for monitoring LED strip lamp running status according to claim 1, it is characterized in that, the concrete grammar obtaining the voltage change Vfcalc that curent change causes in described step S6 is:
S611, Imeas and current-voltage curve to be contrasted, obtain LED strip modulating voltage Vfmeas to be measured, Ical and current-voltage curve are contrasted, obtain LED strip modulating voltage Vfcal to be measured;
S612, calculate the voltage change that LED strip lamp to be measured causes by curent change
Vfcalc＝(Vfmeas-Vfcal)*LEDnums。
3. the method for monitoring LED strip lamp running status according to claim 1, it is characterized in that, the concrete grammar obtaining the voltage change Vtj that temperature variation causes in described step S6 is:
S621, detect LED strip lamp junction temperature Tjmeas to be measured;
S622, calculate the voltage change that LED strip lamp to be measured causes by temperature variation
Vtj＝[(Tjmeas-Tjcal)*Tcoef]*LEDnums。
4. the method for monitoring LED strip lamp running status according to claim 1, is characterized in that: obtaining the concrete grammar changing the voltage change Vtime caused working time in described step S6 is:
S631, obtain the time cumulation variable Ttime obtained by timer;
S632, calculate LED strip lamp to be measured according to forward voltage-time curve and changed the voltage change caused by working time
Vtime＝Life(Ttime)*LEDnums。
5. the method for monitoring LED strip lamp running status according to claim 1, is characterized in that: also calculate in LED strip lamp the LED number that lost efficacy in described step S14, computing formula is as follows:
NUMbad＝Verror/(Vpredicted/LEDnums)。
6. the method for the monitoring LED strip lamp running status according to any one of claim 1-5, is characterized in that: in described step 15, by checking that the mode whether LED strip lamp has short circuit, open circuit or change LED gets rid of LED string fault.
7. the method for monitoring LED strip lamp running status according to claim 1, it is characterized in that: in described step S4, Ical margin tolerance is 20%.
8. the method for monitoring LED strip lamp running status according to claim 1, is characterized in that: in described step S9, judges that LED string does not have fault when Verror is within 12% of Vpredicted.
9. one kind realizes the system of method described in any one of claim 1-5, it is characterized in that: processor (1) and LED strip lamp (2), be connected to power-supply unit (3), temperature sensor (4), tension measuring circuit (5), current measurement circuit (6) between described processor (1) and LED strip lamp (2), and described processor (1) is also connected with internal memory (7), input-output device (8), timer (9) respectively.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107300665A (en) * | 2017-06-13 | 2017-10-27 | 江苏固立得精密光电有限公司 | A kind of LED chip pressure drop method for monitoring abnormality of multiple light courcess |
| CN107592697A (en) * | 2017-08-09 | 2018-01-16 | 深圳纳富特科技有限公司 | Detection method, device and the readable storage medium storing program for executing of the working condition of LED lamp |
| CN110979182A (en) * | 2019-12-24 | 2020-04-10 | 东风电子科技股份有限公司 | Vehicle lamp fault diagnosis method |
| TWI759116B (en) * | 2021-02-25 | 2022-03-21 | 咸瑞科技股份有限公司 | Lamp failure detection method |
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| US20120239326A1 (en) * | 2011-03-15 | 2012-09-20 | Honeywell International Inc. | Systems and methods for monitoring operation of an led string |
| CN102854446A (en) * | 2012-08-14 | 2013-01-02 | 蚌埠德豪光电科技有限公司 | Method for detecting service life of LED (light emitting diode) device, detection circuit and application thereof |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20120239326A1 (en) * | 2011-03-15 | 2012-09-20 | Honeywell International Inc. | Systems and methods for monitoring operation of an led string |
| CN102854446A (en) * | 2012-08-14 | 2013-01-02 | 蚌埠德豪光电科技有限公司 | Method for detecting service life of LED (light emitting diode) device, detection circuit and application thereof |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107300665A (en) * | 2017-06-13 | 2017-10-27 | 江苏固立得精密光电有限公司 | A kind of LED chip pressure drop method for monitoring abnormality of multiple light courcess |
| CN107592697A (en) * | 2017-08-09 | 2018-01-16 | 深圳纳富特科技有限公司 | Detection method, device and the readable storage medium storing program for executing of the working condition of LED lamp |
| CN110979182A (en) * | 2019-12-24 | 2020-04-10 | 东风电子科技股份有限公司 | Vehicle lamp fault diagnosis method |
| CN110979182B (en) * | 2019-12-24 | 2023-03-10 | 东风电子科技股份有限公司 | Vehicle lamp fault diagnosis method |
| TWI759116B (en) * | 2021-02-25 | 2022-03-21 | 咸瑞科技股份有限公司 | Lamp failure detection method |
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