CN102118913B - Device and method for monitoring abnormal state of light-emitting diode - Google Patents
Device and method for monitoring abnormal state of light-emitting diode Download PDFInfo
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- CN102118913B CN102118913B CN200910244620.9A CN200910244620A CN102118913B CN 102118913 B CN102118913 B CN 102118913B CN 200910244620 A CN200910244620 A CN 200910244620A CN 102118913 B CN102118913 B CN 102118913B
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Abstract
The invention relates to a device and method for monitoring the abnormal state of a light-emitting diode. The device is connected to both ends of the light-emitting diode and can be used for monitoring the abnormal state of the light-emitting diode by detecting the change of the working voltage of the light-emitting diode. The device and the method can be used for monitoring the working voltage VF of each light-emitting diode in a light-emitting diode matrix in real time, judging whether the working voltage VF is higher than a determined high threshold voltage VH or not and whether the working voltage VF is lower than a determined low threshold voltage VL or not, and accordingly judging whether a current light-emitting diode abnormally works or not, or short circuit or open circuit faults are already generated or not; and in addition, the positions of the light-emitting diodes which abnormally work and go wrong can be positioned quickly under the working state of the light-emitting diode matrix so as to facilitate maintenance and replacement.
Description
Technical field
The present invention relates to electric circuit inspection field, more specifically, the present invention relates to a kind of device and method to light-emitting diode monitoring abnormal state.
Background technology
In traditional ultraviolet curing technology, conventional ultraviolet light source is mostly tubulose high-pressure mercury lamp.Described tubulose presses high mercury lamp due to its architectural characteristic, makes it in utilizing ultraviolet curing technology, exist following deficiency:, at the length direction of mercury lamp, a little less than the luminous intensity at two ends, can not form the irradiation area of even intensity, ultraviolet curing effect is reduced; High-pressure mercury lamp belongs to thermal light source, and tube wall temperature is conventionally in 600 to 800 degrees Celsius, and its corresponding heat abstractor volume is large, causes cost higher; Because high-pressure mercury lamp belongs to thermal light source, can produce a large amount of infrared rays, it is inapplicable on the more sensitive material to ratio of specific heat, and ultraviolet generation efficiency is lower simultaneously; In addition, the high-pressure mercury lamp life-span is lower, generally only has 1 to 2,000 hour, needs regular replacing fluorescent tube, so also can increase use cost.Therefore, because tubulose high-pressure mercury lamp has above-mentioned deficiency, so it has certain limitation in the application of ultraviolet curing technology.
At present, the ultraviolet curing lamp based on high-power ultraviolet light emitting diode matrix has obtained application more and more widely as the regeneration product of conventional high-tension mercury lamp.Fig. 1 and Fig. 2 show the ultraviolet curing lamp that two kinds of ultraviolet LED arrays of the prior art form.In Fig. 1 and Fig. 2, light-emitting diode 11 and 21 is for being arranged on respectively the dissimilar high-power ultraviolet light-emitting diode on base plate, and a plurality of light-emitting diode 11 and 21 composition light emitting diode matrixs, thereby obtains large-powder ultraviolet output.With respect to high-pressure mercury lamp, the ultraviolet curing lamp based on high-power ultraviolet light emitting diode matrix mainly has the following advantages: 1) even at light-emitting area irradiation energy; 2) owing to belonging to cold light source, therefore its cooling system is simple; 3) do not produce infrared ray, and ultraviolet generation efficiency is high; 4) be applicable to heat-sensitive material; 5) working life reaches 2 to 50,000 hours; 6) lower etc. to the little and cost of surrounding environment influence.
In actual applications, when certain or some the ultraviolet LED unstable working condition in a plurality of ultraviolet LEDs, luminous efficiency reduce or lost efficacy, to directly cause the inhomogeneous of ultraviolet irradiation area light intensity, thereby affect final ultraviolet curing effect.But the quantity of the ultraviolet LED adopting due to the ultraviolet curing lamp of high-power ultraviolet light emitting diode matrix is more, monitoring and detecting and just become very difficult each ultraviolet LED operating state.
In addition, from current type of drive, for a fairly large number of light emitting diode matrix, the general rear type of drive in parallel of first series connection that adopts, as shown in Figure 3.The problem that this type of drive is brought is, certain light-emitting diode in tandem queue breaks down, the normal operation of whole tandem queue light-emitting diode will directly be had influence on, easily directly cause whole tandem queue to work, but to from whole tandem queue, find that light-emitting diode breaking down to keep in repair, from detection means, there is certain difficulty.
At present, at the patent CN 200720059968.7 of prior art, a kind of LED testing apparatus is disclosed.In this patent, in order how to solve the brightness of automatic decision LED and the problem of state, disclose a kind of utilize light detecting module the luminance of LED is monitored and signal transmission to control module, thereby realize LED brightness automatic decision.Described smooth detecting module has adopted photo resistance, utilizes photoelectric characteristic of photo resistance to judge that whether LED device is normal.But, the disclosed technical scheme of this patent exists following defect: due to light-sensitive device can only closely be arranged on tested LED near, and carry out curent change according to the received intensity of light source, when for the present invention, run into the intensive a plurality of light-emitting diode being arranged in light emitting diode matrix time, the technical scheme that this patent proposes can not guarantee that the light source that light-sensitive device receives is exactly the light source that its corresponding LED device sends, so can not solve technical problem of the present invention.
In addition, based on security consideration, to ultra-violet lamp, cannot carry out the manual detection under operating state.So, the above-mentioned phenomenon based on prior art, in the urgent need to address how to adopting the operating state of each light-emitting diode in the ultraviolet curing lamp of ultraviolet LED array to carry out the problem of monitoring in real time and failure detection.
Summary of the invention
Therefore, in order to overcome the above-mentioned defect of prior art and to address the above problem, the object of this invention is to provide a kind of device to the monitoring abnormal state of light-emitting diode, it is the abnormal work monitoring state to light-emitting diode in real time, can in a plurality of light-emitting diodes, locate fast in time the position of the light-emitting diode that occurs operation irregularity, thereby guarantee the normal operation of whole light emitting diode matrix, and then guarantee ultraviolet curing effect.
According to object of the present invention, technical scheme provided by the present invention is a kind of device to the monitoring abnormal state of light-emitting diode.Described device is connected to the two ends of light-emitting diode, by detecting the variation of light-emitting diode operating voltage, thus monitoring abnormal state that can be to light-emitting diode.
In the present invention, described device comprises circuit module; The first reference voltage source, it produces the first reference voltage VL, as the low threshold value VL of light-emitting diode operating voltage; The second reference voltage source, it produces the second reference voltage VH, as the high threshold VH of light-emitting diode operating voltage; Wherein, the low threshold value VL of described light-emitting diode operating voltage and high threshold VH all transfer to circuit module.
Circuit module of the present invention comprises: subtracter, and it is connected in parallel on the two ends of light-emitting diode, for generation of the operating voltage VF of described light-emitting diode; Described subtracter is connected with the first comparator and the second comparator, wherein, the first comparator is compared with low threshold value VL to the operating voltage VF of light-emitting diode, and when operating voltage VF is during lower than low threshold value VL, a high level signal is transported to the first coupled indication piece; The second comparator is compared with the high threshold VH of light-emitting diode operating voltage to operating voltage VF, and when operating voltage VF is during higher than described high threshold VH, a high level signal is transported to the second coupled indication piece.By adopting described circuit module, can detect in real time the voltage at light-emitting diode two ends, and the operating state that extremely reflects light-emitting diode by change in voltage is abnormal; And the alarm signal by the first and second indication pieces can conveniently be carried out real-time judgment to light-emitting diode.
Especially, in thering is the circuit of a plurality of light-emitting diodes, circuit module can be connected to the two ends of each light-emitting diode.Thereby, utilize each light-emitting diode is monitored in real time, and utilize the first and second indication pieces in circuit module, can determine rapidly the position of the light-emitting diode that occurs abnormality.
Further, the solution of the present invention also includes controller, and it is for receiving the signal of described the first indication piece and the second indication piece, and for the abnormality of comprehensive judgement light-emitting diode.Adopt described controller, can remotely to the abnormality of each light-emitting diode, monitor in real time, and by the analysis of controller, can comprehensively judge the integrality of a plurality of light emitting diode matrixs, avoid the direct observation to light-emitting area, thereby guarantee operating personnel's safety.
Based on inventive concept of the present invention, the present invention also provides a kind of method to the monitoring abnormal state of light-emitting diode.In method, the two ends by light-emitting diode connect supervising device, utilize described supervising device to detect the variation of light-emitting diode operating voltage, thus monitoring abnormal state that can be to light-emitting diode.
The method according to this invention comprises the following steps: utilize the subtracter of the circuit module in supervising device to obtain the operating voltage VF of light-emitting diode; Utilize the first comparator to judge the voltage VL whether operating voltage VF produces lower than the first reference voltage source, when voltage VL that operating voltage VF produces lower than the first reference voltage source, produce a high level to the first indication piece, thereby judgement light-emitting diode operating voltage is on the low side or short circuit; Utilize the second comparator to judge the voltage VH whether operating voltage VF produces higher than the second reference voltage source, when voltage VH that operating voltage VF produces higher than the second reference voltage source, produce a high level to the second indication piece, thereby judge that light-emitting diode operating voltage is higher or open circuit.By above step, real monitoring in the time of can carrying out the variation of the operating voltage of light-emitting diode, and then the abnormal work state of light-emitting diode has been carried out to real-time monitoring.
Especially, in thering is the circuit of a plurality of light-emitting diodes, at the two ends of each light-emitting diode, all connect described circuit module, thereby can carry out for the state of each light-emitting diode accurate monitoring in real time.
Further, method of the present invention is further comprising the steps of: the signal of the first indication piece and the second indication piece is transferred to controller, utilize the abnormality of controller synthesis judgement light-emitting diode.
The present invention, by adopting said apparatus and method, can realize the abnormal work state of light-emitting diode is carried out to the object of monitoring in real time, especially, in light emitting diode matrix, can realize the object that each light-emitting diode is monitored in real time and located.Meanwhile, under the state of light emitting diode matrix work, can locate fast the position of operation irregularity and the light-emitting diode breaking down, be convenient to maintenance and change.By realizing the real-time status monitoring of each light-emitting diode and failure detection, guaranteed the normal operation of whole light emitting diode matrix, make the radiant light region energy of ultraviolet curing lamp even, finally guaranteed ultraviolet curing quality.
Should be understood that, for invention, general introduction above or detailed description is below all example and illustrative, is intended to the advocated explanation that the invention provides, but not protection scope of the present invention is limited.
Accompanying drawing explanation
Accompanying drawing provides further to be understood the present invention, is incorporated to and forms the application's a part.Specific embodiments of the invention together with specification in order to illustrate the feature of structure of the present invention and method.In the accompanying drawings:
Fig. 1 shows light-emitting diode linear array structural representation of the prior art;
Fig. 2 shows light-emitting diode two-dimensional array structure schematic diagram of the prior art;
Fig. 3 shows the rear light-emitting diode type of drive schematic diagram in parallel of first series connection of the prior art;
Fig. 4 shows a kind of structural representation to the device of light-emitting diode abnormality monitoring of the embodiment of the present invention; With
Fig. 5 shows the schematic flow sheet of a kind of light-emitting diode abnormality method for supervising of the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, content of the present invention is described in further detail.
In actual applications, for LED (Light Emitting diode), along with the passing of service time, the variation of operating state is being mainly manifested in aspect electricity in the variation of two ends operating voltage.Under same drive current, the reduction of two ends operating voltage means the decline of single LED power, and the light energy thereupon exported also can correspondingly decline.When two ends operating voltage equates, mean that short trouble has occurred light-emitting diode, do not had light energy to export.Similarly, when the operating voltage at light-emitting diode two ends rises, mean the rising of single LED power, although the light energy of exporting may slightly rise, but the rising major part of power has changed into the power consumption of light-emitting diode itself, the working temperature of the light-emitting diode that can raise, the life-span of seriously reducing light-emitting diode, easily cause burning of light-emitting diode, thereby open circuit fault occurs.According to the variation phenomenon of light-emitting diode operating voltage, the monitoring of light-emitting diode operation irregularity state has just been converted to the monitoring that light-emitting diode two ends operating voltage is changed.Thereby, inventive concept of the present invention is: a kind of device to the monitoring abnormal state of light-emitting diode is provided, described device is connected to the two ends of light-emitting diode, by detecting the variation of light-emitting diode operating voltage, thus monitoring abnormal state that can be to light-emitting diode.
Embodiment mono-:
When a light-emitting diode is carried out to condition monitoring, enforcement technical scheme of the present invention adopts following setting.
Set supervising device comprises circuit module; The first reference voltage source, it produces the first reference voltage VL, as the low threshold value VL of light-emitting diode operating voltage; The second reference voltage source, it produces the second reference voltage VH, as the high threshold VH of light-emitting diode operating voltage; Wherein, the low threshold value VL of described light-emitting diode operating voltage and high threshold VH all transfer to circuit module.
Circuit module of the present invention comprises: subtracter, and it is connected in parallel on the two ends of light-emitting diode, for generation of the operating voltage VF of described light-emitting diode; Described subtracter is connected with the first comparator and the second comparator, wherein, the first comparator is compared with low threshold value VL to the operating voltage VF of light-emitting diode, and when operating voltage VF is during lower than low threshold value VL, a high level signal is transported to the first coupled indication piece; The second comparator is compared with the high threshold VH of light-emitting diode operating voltage to operating voltage VF, and when operating voltage VF is during higher than described high threshold VH, a high level signal is transported to the second coupled indication piece.By adopting described circuit module, can detect in real time the voltage at light-emitting diode two ends, and the operating state that extremely reflects light-emitting diode by change in voltage is abnormal; And the alarm signal by the first and second indication pieces can conveniently be carried out real-time judgment to light-emitting diode.
The first and second indication pieces of the present invention can adopt the indicator light of two kinds of different colours, for to occurring that two kinds of abnormalities of abnormal light-emitting diode identify.The present embodiment can be decided to be green by the first indicator light, and the second indicator light is red, and, when the operating voltage VF of light-emitting diode is during lower than low threshold value VL, the indicator light of green is bright, shows that the voltage at light-emitting diode two ends is low or in short-circuit condition; When the operating voltage VF of light-emitting diode is during higher than high threshold VH, red indicator light is bright, shows that the voltage at light-emitting diode two ends is high or in off state.Thereby, by adopting device of the present invention, monitoring abnormal state that can be to light-emitting diode.And utilize the indicator light of different colours to identify the abnormality of light-emitting diode.
Embodiment bis-:
On for circuit, have in the situation of a plurality of light-emitting diodes, the present invention also provides a kind of device to the monitoring abnormal state of each light-emitting diode.Referring now to accompanying drawing, describe the concrete structure feature of the present embodiment in detail.
Fig. 1 and Fig. 2 show the ultraviolet curing lamp that two kinds of ultraviolet LED arrays of the prior art form.In Fig. 1 and Fig. 2, light-emitting diode 11 and 21 is for being arranged on respectively the dissimilar high-power ultraviolet light-emitting diode on base plate, and a plurality of light-emitting diode 11 and 21 composition light emitting diode matrixs, thereby obtains large-powder ultraviolet output.Fig. 3 is light-emitting diode type of drive schematic diagram in parallel after first series connection of the prior art.
For the ease of understanding inventive concept of the present invention, it is example that light-emitting diode type of drive in parallel after the first series connection shown in Fig. 3 is all take in the present invention, the design feature of demonstration ground explanation apparatus of the present invention and method.It will be appreciated by persons skilled in the art that apparatus and method of the present invention also can be applicable to, in other type of drive of light-emitting diode, to this, repeat no more herein.
As shown in Figure 3, if when in series loop, certain light-emitting diode is short-circuited, just this light-emitting diode is not luminous, and can not have influence on other light-emitting diode of same series loop; But, if when certain light-emitting diode opens circuit in series loop, can make other light-emitting diode of same series loop all quit work.
So, for this phenomenon, the invention provides a kind of device to light-emitting diode monitoring abnormal state.
With reference to Fig. 4, it is a kind of structural representation to the device of light-emitting diode abnormality monitoring of the present invention.
In Fig. 4, according to the device to the monitoring of light-emitting diode abnormality of the present invention, described device comprises: on each light-emitting diode, be parallel with subtracter 401, described subtracter is for the operating voltage V+ at each light-emitting diode two ends and V-are done to subtraction, thus the operational voltage value VF while obtaining light-emitting diode work; The first reference voltage source 402, for generation of reference voltage VL, gives the first comparator 404 as the low threshold value of light-emitting diode operating voltage; The second reference voltage source 403, for generation of reference voltage VH, gives the second comparator 405 as the high threshold of light-emitting diode operating voltage; The first comparator 404, whether low than low threshold voltage VL for judging the operational voltage value VF of work at present of light-emitting diode, if lower than low threshold voltage VL, export high level alarm signal to the first indication piece 406; The second comparator 405, whether higher than high threshold voltage VH for judging the operational voltage value VF of work at present of light-emitting diode, if higher than high threshold VH, output high level alarm signal is given the second indication piece 407.
In the present embodiment, the first indication piece 406 is green LED indicator light 406, for receiving the alarm signal of the first comparator output, and some bright green warning LED; The second indication piece 407 is red LED indicator light 407, for receiving the alarm signal of the second comparator output, lights red alarm LED.
In order to make supervising device volume of the present invention small and exquisite, each parts except the first reference voltage source and the second reference voltage source can be made to circuit module, this circuit module comprises: subtracter, two comparators and two indication pieces.For the monitoring abnormal state to each light-emitting diode, for the light-emitting diode quantity of connecting under same drive current, for each light-emitting diode configures separately foregoing circuit module.
Further, for can be at the state of each light-emitting diode of remote monitoring, device of the present invention is also provided with controller 408, it is for receiving the first comparator 404 of each light-emitting diode detection device and the alarm signal that the second comparator 405 is exported, comprehensive misjudgment state, and system maintenance is carried out in prompting.
Especially, in the present embodiment, first, second reference voltage and controller all can be used as the common component of whole supervising device, and each light-emitting diode has the circuit module of independent configuration, thereby whole supervising device is simplified the structure.
In order to be more expressly understood inventive concept of the present invention and design feature, now to of the present invention, the course of work of the device of the monitoring abnormal state of light-emitting diode is carried out to following description.
According to the parameter of used light-emitting diode, preset high threshold VH and the low threshold value VL of this light-emitting diode operating voltage.When the operating voltage of this light-emitting diode exceeds the voltage range that high threshold VH and low threshold value VL limit, can judge that the operating state of this light-emitting diode is abnormal, need maintenance or change.
When whole light emitting diode matrix energising is carried out after work, the subtracter 401 being disposed in the testing circuit of each light-emitting diode is done subtraction to the operating voltage V+ at each light-emitting diode two ends and V-, thus the work at present magnitude of voltage VF while obtaining each light-emitting diode work;
By the first comparator 404, whether the operational voltage value VF of work at present that judges light-emitting diode is lower than the low threshold voltage VL producing by the first reference voltage source 402, if the words of low too low threshold value VL, judge that current light-emitting diode operating voltage is on the low side, working state abnormal, or the fault that has been short-circuited, and output high level alarm signal are lighted green LED indicator light 406 simultaneously.It should be noted that, no matter this light-emitting diode operating voltage is on the low side or be short-circuited fault, can not have influence on the normal operation of same other light-emitting diode of series loop, because drive the current circuit of series connection light-emitting diode not to be blocked.
By the second comparator 405, whether the operational voltage value VF of work at present that judges light-emitting diode is higher than the high threshold voltage VH producing by the second reference voltage source 403, if exceed the words of high threshold VH, judge that current light-emitting diode operating voltage is higher, working state abnormal, or open circuit fault has occurred, and output high level alarm signal is lighted red LED indicator light 407 simultaneously.It should be noted that, when there is the higher warning of light-emitting diode operating voltage, be divided into two kinds of different situations.The first situation is that this light-emitting diode operating voltage is higher, but still in work, the current circuit of not blocking place series connection light-emitting diode, does not affect the normal operation of other light-emitting diode, does not affect the normal operation of the corresponding testing circuit of other light-emitting diodes yet; The second situation is this light-emitting diode generation open circuit fault, has blocked the current circuit of place series connection light-emitting diode, and all light-emitting diodes of place series loop have all stopped work.In this case, the two ends operating voltage of all light-emitting diodes of these isolation diode both sides is all zero, can cause corresponding testing circuit output short-circuit alarm signal.
When the second comparator 405 in certain light-emitting diode testing circuit is exported high level alarm signal, if the first comparator 404 of other all light-emitting diodes in same series loop is also exported high level alarm signal, represent that open circuit fault has occurred that Light-Emitting Diode, the light-emitting diode in whole series loop quits work.Otherwise, only represent that the light-emitting diode operating voltage of current warning is higher, but still working on.
By the output signal of all light-emitting diode testing circuit the first comparators 404 and the second comparator 405 in controller 408 detection light emitting diode matrixs, comprehensive judgement which or which light-emitting diode work at present state is undesired, or short circuit or open circuit fault have occurred, and system maintenance is carried out in prompting.
For maintainer, can be in the situation that whole light emitting diode matrix continues start work, by green and the red alarm LED lamp observed in testing circuit, can grasp malfunction, and the particular location of the light-emitting diode that break down in location rapidly.In the corresponding testing circuit of the light-emitting diode in same series loop, there are single or several green warning LED lamps to light, represent that corresponding light-emitting diode operating voltage is on the low side, or short trouble has occurred; When there being red alarm LED to light, represent that corresponding light-emitting diode operating voltage is higher; When only having a red alarm LED to light, when other the green warning LED in same series loop are bright, represent that open circuit fault has occurred current light-emitting diode.Thereby can carry out rapid-maintenance targetedly, avoid the direct observation to light-emitting area, guarantee attendant's safety.
Based on inventive concept of the present invention, the present invention also provides a kind of method to the monitoring abnormal state of light-emitting diode.In method, the two ends by light-emitting diode connect supervising device, utilize described supervising device to detect the variation of light-emitting diode operating voltage, thus monitoring abnormal state that can be to light-emitting diode.
The method according to this invention comprises the following steps: utilize the subtracter of the circuit module in supervising device to obtain the operating voltage VF of light-emitting diode; Utilize the first comparator to judge the voltage VL whether operating voltage VF produces lower than the first reference voltage source, when voltage VL that operating voltage VF produces lower than the first reference voltage source, produce a high level to the first indication piece, thereby judgement light-emitting diode operating voltage is on the low side or short circuit; Utilize the second comparator to judge the voltage VH whether operating voltage VF produces higher than the second reference voltage source, when voltage VH that operating voltage VF produces higher than the second reference voltage source, produce a high level to the second indication piece, thereby judge that light-emitting diode operating voltage is higher or open circuit.By above step, real monitoring in the time of can carrying out the variation of the operating voltage of light-emitting diode, and then the abnormal work state of light-emitting diode has been carried out to real-time monitoring.
Especially, in thering is the circuit of a plurality of light-emitting diodes, at the two ends of each light-emitting diode, all connect described circuit module, thus real monitoring in the time of can carrying out the state of each light-emitting diode.
Further, method of the present invention is further comprising the steps of: the signal of the first indication piece and the second indication piece is transferred to controller, utilize the abnormality of controller synthesis judgement light-emitting diode.
Below in conjunction with accompanying drawing, method provided by the invention is described.
Referring to Fig. 5, the schematic flow sheet of the method that its a kind of light-emitting diode abnormality that shows the embodiment of the present invention is monitored.
First utilize subtracter, obtain the operating voltage of each light-emitting diode; Then, judge the whether operating voltage fault that is still short-circuited on the low side of light-emitting diode; Or judge that whether this operating voltage is higher; Or judge whether light-emitting diode open circuit fault occurs, simultaneously or fault abnormal by controller reporting; Finally utilize the green and red led signal that gives the alarm, thereby facilitate maintainer locate fast the source of trouble and keep in repair.
In sum, by adopting apparatus and method of the present invention, monitor in real time the operating voltage VF of each light-emitting diode in light emitting diode matrix, judge whether higher than definite high threshold voltage VH and judge whether lower than definite low threshold voltage VL, thereby judge whether operation irregularity of current light-emitting diode, or be short-circuited or open circuit fault.Meanwhile, under light emitting diode matrix operating state, locate fast the position of operation irregularity and the light-emitting diode breaking down, be convenient to maintenance and change.Thereby realize the real-time status monitoring of each light-emitting diode and failure detection, guarantee the normal operation of whole light emitting diode matrix, make the light region energy of ultraviolet curing lamp institute radiation even, thereby guarantee final ultraviolet curing quality.
Because in the situation that not departing from the scope of the invention, can carry out various modifications and variations, therefore it is illustrative and nonrestrictive in above-mentioned explanation, comprising that all technical characterictics shown in accompanying drawing or content be construed as.
Claims (6)
1. the device to the monitoring abnormal state of light-emitting diode, it is characterized in that, described device is connected to the two ends of light-emitting diode, by detecting the variation of described light-emitting diode operating voltage, thereby monitoring abnormal state that can be to light-emitting diode
Described device comprises:
Circuit module; The first reference voltage source, it produces the first reference voltage VL, as the low threshold value VL of light-emitting diode operating voltage; The second reference voltage source, it produces the second reference voltage VH, as the high threshold VH of light-emitting diode operating voltage; Low threshold value VL and the high threshold VH of wherein said light-emitting diode operating voltage all transfer to described circuit module;
Described circuit module comprises:
Subtracter, it is connected in parallel on the two ends of light-emitting diode, for generation of the operating voltage VF of described light-emitting diode; Described subtracter is connected with the first comparator and the second comparator, wherein,
The first comparator is compared with described low threshold value VL to the operating voltage VF of described light-emitting diode, and when described operating voltage VF is during lower than described low threshold value VL, a high level signal is transported to the first coupled indication piece; The second comparator is compared with the high threshold VH of described light-emitting diode operating voltage to described operating voltage VF, and when described operating voltage VF is during higher than described high threshold VH, a high level signal is transported to the second coupled indication piece.
2. device according to claim 1, is characterized in that, in having the circuit of a plurality of light-emitting diodes, described circuit module is connected to the two ends of each light-emitting diode.
3. device according to claim 1 and 2, is characterized in that, described device also includes controller, and it is for receiving the signal of described the first indication piece and the second indication piece, and for the abnormality of comprehensive judgement light-emitting diode.
4. the method to the monitoring abnormal state of light-emitting diode, it is characterized in that, by the two ends at light-emitting diode, connect supervising device, utilize described supervising device to detect the variation of described light-emitting diode operating voltage, thereby monitoring abnormal state that can be to light-emitting diode
Said method comprising the steps of:
A) utilize the subtracter of the circuit module in described supervising device to obtain the operating voltage VF of light-emitting diode;
B) utilize the first comparator to judge the voltage VL whether described operating voltage VF produces lower than the first reference voltage source, when voltage VL that operating voltage VF produces lower than the first reference voltage source, produce a high level to the first indication piece, thereby judgement light-emitting diode operating voltage is on the low side or short circuit;
C) utilize the second comparator to judge the voltage VH whether described operating voltage VF produces higher than the second reference voltage source, when voltage VH that operating voltage VF produces higher than the second reference voltage source, produce a high level to the second indication piece, thereby judge that light-emitting diode operating voltage is higher or open circuit.
5. method according to claim 4, is characterized in that, in having the circuit of a plurality of light-emitting diodes, at the two ends of each light-emitting diode, all connects described circuit module, thereby can monitor in real time the state of each light-emitting diode.
6. according to the method described in claim 4 or 5, it is characterized in that, described method is further comprising the steps of: the signal of described the first indication piece and the second indication piece is transferred to controller, utilize the abnormality of controller synthesis judgement light-emitting diode.
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| US6225912B1 (en) * | 1998-07-16 | 2001-05-01 | Hitachi Cable, Ltd. | Light-emitting diode array |
| CN101489335A (en) * | 2008-01-18 | 2009-07-22 | 尼克森微电子股份有限公司 | LED driving circuit and secondary side controller thereof |
| CN101534594A (en) * | 2008-03-12 | 2009-09-16 | 奇美电子股份有限公司 | Circuit and method for short-circuit protection of light-emitting diode (LED) lightbars |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6225912B1 (en) * | 1998-07-16 | 2001-05-01 | Hitachi Cable, Ltd. | Light-emitting diode array |
| CN101489335A (en) * | 2008-01-18 | 2009-07-22 | 尼克森微电子股份有限公司 | LED driving circuit and secondary side controller thereof |
| CN101534594A (en) * | 2008-03-12 | 2009-09-16 | 奇美电子股份有限公司 | Circuit and method for short-circuit protection of light-emitting diode (LED) lightbars |
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| CN102118913A (en) | 2011-07-06 |
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