WO2017163862A1 - Dispositif de détection d'anomalie de court-circuit pour système d'éclairage à del, dispositif d'éclairage à del doté dudit dispositif, et procédé de détection d'anomalie de court-circuit pour système d'éclairage à del - Google Patents

Dispositif de détection d'anomalie de court-circuit pour système d'éclairage à del, dispositif d'éclairage à del doté dudit dispositif, et procédé de détection d'anomalie de court-circuit pour système d'éclairage à del Download PDF

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Publication number
WO2017163862A1
WO2017163862A1 PCT/JP2017/009107 JP2017009107W WO2017163862A1 WO 2017163862 A1 WO2017163862 A1 WO 2017163862A1 JP 2017009107 W JP2017009107 W JP 2017009107W WO 2017163862 A1 WO2017163862 A1 WO 2017163862A1
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WIPO (PCT)
Prior art keywords
led
unit
short
reference data
potential
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PCT/JP2017/009107
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English (en)
Japanese (ja)
Inventor
孚 出島
Original Assignee
株式会社アイテックシステム
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Application filed by 株式会社アイテックシステム filed Critical 株式会社アイテックシステム
Priority to CN201780030361.2A priority Critical patent/CN109156073B/zh
Publication of WO2017163862A1 publication Critical patent/WO2017163862A1/fr

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H05B47/165—Controlling the light source following a pre-assigned programmed sequence; Logic control [LC]
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/20—Responsive to malfunctions or to light source life; for protection
    • H05B47/25—Circuit arrangements for protecting against overcurrent
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/20—Responsive to malfunctions or to light source life; for protection
    • H05B47/28—Circuit arrangements for protecting against abnormal temperature

Definitions

  • the present invention relates to an apparatus for detecting a short circuit abnormality in an LED lighting system, an LED lighting system having the apparatus, and a short circuit abnormality detecting method for the LED lighting system, and more specifically, a plurality of LEDs connected in series.
  • the present invention relates to an apparatus for detecting a short circuit of one or more LEDs in an LED unit, an LED illumination system having the apparatus, and a method for detecting the short circuit.
  • the detection position of a sensor such as a line sensor camera in the inspection of manufactured products in various manufacturing processes for manufacturing steel plates, sheet glass, food, banknotes, etc.
  • a line illumination device that illuminates in a line according to the angle of view of a sensor is known (for example, see Patent Document 1).
  • this type of illumination device it is necessary to illuminate the detection position of the sensor as brightly and uniformly as possible with a line illumination device in order to increase the inspection speed and accuracy.
  • each LED does not cause a voltage drop proportional to the flowing current, unlike a normal resistor, and does not flow in a non-lighting state, and causes a voltage drop of, for example, about 3 V in a lighting state. For this reason, when a disconnection abnormality occurs in one of the plurality of LEDs in the LED unit, no current flows through the LED unit, and all LEDs do not light up. On the other hand, when a short circuit abnormality occurs in one of the plurality of LEDs in the LED unit, when the supplied current is the same, the voltage drop of the LED unit is reduced by the amount of the shorted LED.
  • the voltage drop for one LED changes in accordance with the amount of current flowing through the LED, and the change is not proportional to the amount of current and does not change linearly with increasing current. Furthermore, the manufacturing factor variation occurs in the voltage drop for one LED, and the variation may be ⁇ 10% with respect to the target voltage drop value. Furthermore, the voltage drop for one LED may change depending on the temperature (heat generation) of the LED.
  • an illuminating unit having only a configuration directly necessary for lighting such as an LED unit or a lens is arranged in the manufacturing process.
  • a power supply unit having a power supply adjustment unit that adjusts the power supplied to the LED unit and a control unit that sends a control signal to the power supply adjustment unit is disposed at a position away from the illumination unit, and the illumination unit and the power supply unit Are often connected with a connection cord.
  • the above-described configuration is used when illuminating a rolled steel plate or when it is desired to arrange a power supply adjusting unit in the control room. Since the connection cord is formed using a material having a small resistance value, the resistance value of the connection cord may be normally ignored, but the resistance that cannot be ignored in an LED lighting system arranged in a wide space such as a factory. May be a value.
  • an illuminating device used for inspection of manufactured products in various manufacturing processes has a plurality of LED units with a small arrangement interval of LEDs in order to illuminate a wide range brightly and uniformly. Often it has about 10-15 LEDs. For this reason, it is not realistic to regularly measure the voltage drop of all LEDs.
  • the present invention has been made in view of such circumstances, and a short-circuit abnormality detection device for an LED illumination system capable of accurately detecting a short-circuit abnormality of an LED unit including a plurality of LEDs connected in series,
  • An object of the present invention is to provide an LED lighting system having a device, and a short-circuit abnormality detection method for the LED lighting system.
  • a short circuit abnormality detection device for an LED lighting system detects a short circuit abnormality in an LED lighting system including an LED unit having a plurality of LEDs connected in series.
  • a short-circuit abnormality detection device for an LED lighting system wherein the LED lighting system includes an illumination unit having the LED unit and a power supply unit for supplying driving power to the LED unit of the illumination unit.
  • the short circuit abnormality detecting device detects a potential at a first position of the LED unit and a potential at a second position lower than the first position in the LED unit.
  • the LED unit based on a predetermined trigger in a state where the second detection means for connecting the power supply unit and the illumination unit are connected.
  • the reference data based on the potential detected by the first detection means and the potential detected by the second detection means and stored in the storage unit. Comparing the potential detected by the first and second detection means during operation of the LED lighting system or the difference between the two potentials with the reference data stored by the reference data setting means, Short-circuit detecting means for detecting a short circuit of one or more LEDs in the LED unit.
  • the LED lighting system short-circuit abnormality detection method is a LED short-circuit abnormality detection method for detecting a short-circuit abnormality in an LED lighting system including an LED unit having a plurality of LEDs connected in series.
  • the LED illumination system includes an illumination unit having the LED unit and a power supply unit for supplying driving power to the LED unit of the illumination unit, and this short circuit abnormality detection method In a state where the power supply unit and the illumination unit are connected, the LED unit is lit in a predetermined lighting state for reference measurement, and reference data based on a potential at a predetermined position in the LED unit is created and stored.
  • the reference data setting step to be stored in the unit, and before the operation of the LED lighting system
  • the LED unit in a state where the power supply unit and the illumination unit are connected, the LED unit is lit in a predetermined lighting state for reference measurement, and the potential of the first position and the The reference data based on the potential of the second position is created, and when the LED lighting system is operated, the potential of the first and second positions or the difference between the two potentials is compared with the reference data.
  • a short circuit of one or more LEDs is detected. For this reason, even LED lighting systems arranged in large spaces such as factories can perform short circuit detection that takes into account the resistance of lighting system components such as connection cords, and also take into account manufacturing factor variations in LED voltage drops. The detected short circuit can be performed.
  • the short circuit abnormality detection apparatus of the LED lighting system which detects the short circuit abnormality in the LED lighting system provided with the LED unit which has the some LED connected in series is the short circuit abnormality detection apparatus of the LED lighting system which concerns on the 3rd aspect of this invention.
  • the LED illumination system includes an illumination unit having the LED unit, and a power supply unit for supplying driving power to the LED unit of the illumination unit. Is configured to detect the potential at a predetermined position of the LED unit, and connect the LED unit for reference measurement based on a predetermined trigger in a state where the power supply unit and the illumination unit are connected.
  • a storage unit that creates reference data based on the potential detected by the detection means and lights up in a lighting state.
  • the LED lighting system short-circuit abnormality detection method detects a short-circuit abnormality in an LED lighting system that detects a short-circuit abnormality in an LED lighting system including an LED unit having a plurality of LEDs connected in series.
  • the LED illumination system includes an illumination unit having the LED unit and a power supply unit for supplying driving power to the LED unit of the illumination unit, and this short circuit abnormality detection method In a state where the power supply unit and the illumination unit are connected, the LED unit is lit in a predetermined lighting state for reference measurement, and reference data based on a potential at a predetermined position in the LED unit is created and stored.
  • the reference data setting step to be stored in the unit, and before the operation of the LED lighting system By comparison with the reference data a potential of a predetermined position stored in the reference data setting step, and a short detection step of detecting a short circuit of one or more LED in the LED unit.
  • the LED unit is lit in a predetermined lighting state for reference measurement based on a predetermined trigger in a state where the power supply unit and the illumination unit are connected, and the LED One or more of the LED units in the LED unit is created by creating reference data based on the potential at a predetermined position of the unit and storing the reference data in a storage unit, and comparing the potential at the predetermined position with the reference data during operation of the LED lighting system.
  • LED short circuit is detected. For this reason, even in an LED lighting system arranged in a wide space such as a factory, it is possible to perform short-circuit detection that takes into account the resistance of components such as connection cords, and also to consider manufacturing factor variations in LED voltage drop. Short circuit detection can be performed.
  • This LED illumination system illuminates a detection position by an inspection sensor such as a line sensor in a line shape (line shape).
  • an inspection sensor such as a line sensor in a line shape (line shape).
  • an illumination device main body 1 as an illumination unit
  • a power supply unit 2 As a power supply unit 2, a connection cord 3 that connects the lighting device body 1 and the power supply unit 2 and supplies power from the power supply unit 2 to the lighting device body 1, and a short-circuit detection device 4.
  • the connection cord 3 supplies driving power to the lighting device body 1.
  • the illumination device body 1 has at least one, and in this embodiment, a plurality of LED units 10 as shown in FIG.
  • Each LED unit 10 has a plurality of (for example, ten or more) LEDs 11 connected in series, and the plurality of LEDs 11 are mounted on an LED substrate and connected in series.
  • Other circuit elements such as resistors can be added to each LED unit 10.
  • the lighting device body 1 includes a high potential side input terminal 13 connected to the high potential side of each LED unit 10 and a low potential side input terminal 14 connected to the low potential side of each LED unit 10.
  • the power supply unit 2 includes a high potential side terminal 21 that outputs power from a DC power source, a low potential side terminal 22, and a dimming input unit 23. As shown in FIG. 1, the power supply unit 2 has a constant current circuit 24 corresponding to each LED unit 10, and the drive current adjusted by the constant current circuit 24 according to the input of the dimming input unit 23 is on the high potential side.
  • the terminal 21, the connection cord 3, the high potential side input terminal 13, the LED units 10, the low potential side input terminal 14, the connection cord 3, and the low potential side terminal 22 are configured to flow.
  • the dimming input unit 23 may convert the dimming value from the operation unit operated by hand into a digital signal and send it to the control unit 43 described below.
  • the signal input part which sends a signal to the following control part 43 may be sufficient, and you may have both.
  • the short circuit detection device 4 includes a first detection element 41 that detects a potential on the high potential side input terminal 13 side (potential at the first position) with respect to the LED 11 on the highest potential side in each LED unit 10, and in each LED unit 10.
  • a second detection element 42 that detects the potential (potential at the second position) on the lower potential side input terminal 14 side than the LED 11 on the lowest potential side, and a known microcomputer that receives the detection results of the detection elements 41 and 42.
  • a dimming value input for sending a dimming digital signal from the dimming input unit 23 to the control unit 43, connected to the control unit 43, a storage unit 44 made of a non-volatile memory such as a semiconductor memory, and the control unit 43 Part 45.
  • a method of measuring an actual driving current flowing through each LED unit 10 instead of the dimming digital signal and transmitting the measured value to the control unit 43 is also conceivable.
  • a current measuring unit is provided.
  • the current measurement unit performs current measurement using, for example, the potential on the high potential side of the current detection resistor of the constant current circuit.
  • the short detection device 4 also includes a trigger input unit 46 connected to the control unit 43.
  • the trigger input unit 46 is a button disposed on the back of the main body box of the power supply unit 2, but the trigger input unit 46 receives a trigger signal from the outside and transmits the trigger signal to the control unit 43. It may be configured to.
  • the short-circuit detection device 4 further includes a display unit 47 such as a liquid crystal display device connected to the control unit 43, and the display unit 47 is configured to perform a predetermined display under the control of the control unit 43.
  • control unit 43 and the storage unit 44 are configured in a microcomputer chip such as a single MCU (Microcontroller).
  • Each detection element 41, 42 may have wiring and an A / D converter for analog-digital conversion of the potential at each position and sending it to the control unit 43 side as in this embodiment,
  • An electrometer with a wireless transmission function that analog-digital converts the potential of the position and transmits it to the control unit 43 may be used.
  • anything that can send the potential at each position to the control unit 43 is acceptable.
  • the control unit 43 operates based on a program stored in the storage unit 44, and specifically performs the following operations.
  • the button of the trigger input unit 46 is operated in the state where the power supply unit 2 and the lighting device main body 1 are connected with the connection cord 3 that preferably supplies power at the installation place where the power supply unit 2 is actually installed as shown in FIG.
  • the control unit 43 performs reference data creation processing according to the program. You may comprise so that a trigger signal may be sent to the control part 43 from the trigger input part 46, when the electric power supply unit 2 and the illuminating device main body 1 are connected and predetermined time passes.
  • the reference data creation process is configured to obtain reference data (reference potential difference) at each stage while sequentially increasing the current amount in 16 stages, for example.
  • a constant current amount for example, 60 mA
  • the current of the first stage is adjusted so that each constant current circuit 24 flows to each LED unit 10 in a state where no current flows to each LED unit 10.
  • the light input unit 23 is controlled to light each LED unit 10 for reference measurement (step 1-2), and in this state, the potential difference (reference potential difference) between the first and second positions detected by each detection element 41, 42 is detected. ) Is received by the control unit 43 and stored in the storage unit 44 in correspondence with the dimming level (step 1-3).
  • the signals from the detection elements 41 and 42 of each LED unit 10 are sequentially input to the control unit 43 via the connection circuit 48, and the detection elements 41 and 42 of each LED unit 10 are sequentially input by the connection circuit 48. 42 signals are sequentially sent to the control unit 43.
  • the sequential connection circuit 48 is provided in the power supply unit or the illuminating device main body, and the wiring is less if the sequential connection circuit 48 is provided in the power supply unit. For this reason, the control part 43 can obtain the reference potential difference of each LED unit 10. As will be described later, when the control unit 43 obtains the actually measured potential difference, the connection circuit 48 operates in the same manner.
  • the dimming input unit allows each constant current circuit 24 to flow the current amount in the second to sixteenth stages to each LED unit 10.
  • 23 is sequentially controlled to light up each LED unit 10 for reference measurement, and the control unit 43 receives the potential difference (reference potential difference) between the first and second positions detected by the detection elements 41 and 42 in each state.
  • the data is stored in the storage unit 44 in correspondence with each dimming level (step 1-4).
  • reference data as shown in FIG. 2 is created and stored in the storage unit 44.
  • the potentials at the first and second positions may be stored as they are in the storage unit 44 as reference data.
  • the control unit 43 When the LED lighting system is normally operated after the reference data is created in this way, the control unit 43 performs short circuit abnormality detection according to the program, and the control unit 43 displays the result on the display unit 47, or The control unit 43 transmits a signal indicating the result to the outside.
  • this short circuit abnormality detection for each LED unit 10 during normal operation, the measured potential difference between the first and second positions is compared with the reference potential difference of the corresponding dimming level in the reference data, and the difference between the measured potential difference and the reference potential difference is detected. It is determined which position is located with respect to the first threshold value, the second threshold value, and the third threshold value, and the presence / absence or state of the LED short circuit is thereby detected.
  • the first, second, and third threshold values are prepared for the plurality of LED units 10, respectively.
  • the controller 43 controls the reference potential difference and the dimming level of the first dimming level.
  • the reference potential difference between the first stage and the second stage is interpolated using the second stage reference potential difference, and the same interpolation is performed for the first to third thresholds, and based on this, the LED is short-circuited. Detect the presence and state of. It is also possible to provide a temperature sensor in the lighting device body 1 and correct the first to third threshold values based on the detection value of the temperature sensor. The degree of correction can be appropriately set according to the characteristics of the LED 11.
  • the first to third threshold values are set for each dimming state based on the reference potential difference, and further set for each LED unit 10 based on the reference data of each LED unit 10.
  • the first threshold is a value obtained by dividing the reference potential difference in each dimming state by the number of LEDs 11 of the LED unit 10 (reference potential difference per LED 11) 0.3 to 0.7 times, preferably 0.5. It is doubled.
  • the second threshold value is obtained by adding the reference potential difference per one LED 11 to the first threshold value
  • the third threshold value is obtained by adding the reference potential difference per one LED 11 to the second threshold value.
  • the control unit 43 determines that one LED 11 of the LED unit 10 is short-circuited, and the second threshold Is exceeded, it is determined that the two LEDs 11 of the LED unit 10 are short-circuited.
  • the third threshold value is exceeded, three or more LEDs 11 of the LED unit 10 are short-circuited.
  • the control part 43 displays the result on the display part 47 as shown, for example in FIG.
  • the reference potential difference and the measured potential difference are compared.
  • the reference data and the potentials at the first and second positions at the time of operation are used as reference data. Direct comparisons are also possible.
  • the power supply unit 2 and the lighting device main body 1 are connected by the connection cord 3 for supplying power from the power supply unit 2 to the lighting device main body 1 preferably at an installation place where it is actually installed.
  • each LED unit 10 is lit in a predetermined lighting state for reference measurement, and reference data based on the potential at the first position and the potential at the second position is created, and the LED lighting system is operated during the operation of the LED lighting system.
  • a short circuit of one or more LEDs in the LED unit is detected by comparing the potential of the first and second positions or the difference between the two potentials with the reference data.
  • connection cord 3 is used instead of the connection cord 3 used in the actual installation location, reference data is created based on manufacturing factor variations of the voltage drop of the LEDs 11 constituting each LED unit 10.
  • the lighting device body 1, the power supply unit 2, the connection cord 3, and the short-circuit detection device 4 described in the above embodiment are prepared and connected as described above, and the first position and the first position of each LED unit 10 are connected.
  • FIGS. 4 and 5 show reference potential difference data regarding the LED unit 10 having the smallest potential difference among the plurality of LED units 10
  • FIG. 5 shows reference potential difference data concerning the LED unit 10 having the largest potential difference.
  • the data in FIG. 5 has a reference potential difference of about 7 to 13% larger in each dimming state, and it can be seen that the manufacturing factor variation of the voltage drop of each LED is not small.
  • the short circuit detection device 4 of the LED lighting system of the present embodiment includes a temperature sensor 49 disposed in the lighting device body 1.
  • the temperature sensor 49 may measure the temperature of the LED substrate on which one LED unit 10 is mounted among the plurality of LED units 10, and measures the temperature of the LED substrates of the plurality of LED units 10. It may be, and other constituent elements in the lighting device main body 1 and the ambient temperature may be measured.
  • the button of the trigger input unit 46 is connected in the state where the power supply unit 2 and the luminaire main body 1 are connected with the connection cord 3 that preferably supplies power at the actual installation location as shown in FIG.
  • the control unit 43 performs reference data creation processing according to the program.
  • the reference data creation process is performed in one stage after receiving the trigger signal (step 2-1) and in the state where no current flows in each LED unit 10 as in the first embodiment.
  • the dimming input unit 23 is controlled so that each constant current circuit 24 passes the current amount of each eye to each LED unit 10 to light each LED unit 10 for reference measurement (step 2-2).
  • the control unit 43 receives the potential difference (reference potential difference) between the first and second positions detected by the detection elements 41 and 42 and stores it in the storage unit 44 in correspondence with the dimming level (step 2-3).
  • each constant current circuit 24 passes the current amount in the second to sixteenth steps to each LED unit 10.
  • 23 is sequentially controlled to light up each LED unit 10 for reference measurement, and the control unit 43 receives the potential difference (reference potential difference) between the first and second positions detected by the detection elements 41 and 42 in each state.
  • the control unit 43 receives the potential difference (reference potential difference) between the first and second positions detected by the detection elements 41 and 42 in each state.
  • the measurement result of the temperature sensor 49 is stored in the storage unit 44 (step 2-5). The measurement result of the temperature sensor 49 is associated with each reference potential difference.
  • the measurement result of the temperature sensor 49 is stored in the storage unit 44 after step 2-4, but the measurement result of the temperature sensor 49 corresponding to each dimming is stored in the storage unit 44 at each step 2-3. You may store in.
  • reference data as shown in FIG. 7 is created and stored in the storage unit 44.
  • the potentials at the first and second positions can be stored as they are in the storage unit 42 as reference data.
  • the control unit 43 When the LED lighting system is normally operated after the reference data is created in this way, the control unit 43 performs short circuit abnormality detection by the program as in the first embodiment, and the control unit 43 detects the result. The control unit 43 transmits the signal displayed on the display unit 47 or indicating the result to the outside.
  • the difference between the measured potential difference and the reference potential difference is compared with the first to third thresholds to determine the short-circuit abnormality.
  • one of the measured potential difference and the reference potential difference is determined.
  • the first to third thresholds are compared between the temperature-compensated one and the other, and a short circuit abnormality is determined.
  • a potential difference correction value is obtained by applying a predetermined coefficient or a predetermined temperature compensation arithmetic expression to the temperature difference between the temperature associated with the reference potential difference of the reference data and the measurement result of the temperature sensor 49 when measuring the actual potential difference.
  • the potential difference correction value is applied to one of the actually measured potential difference and the reference potential difference, and then compared with the first to third threshold values.
  • a predetermined coefficient a temperature coefficient determined by the type of LED can be used. This coefficient measures the temperature characteristics of the plurality of LEDs 11 and uses the average value of the measured temperature characteristics.
  • short-circuit detection is performed in consideration of the temperature characteristics of each LED 11 in addition to the resistance of the connection cord of the LED lighting system arranged in a wide space such as a factory and the manufacturing factor variation of the LED voltage drop. Is possible.
  • the LED illumination system of the present embodiment is obtained by omitting the first detection element 41 of the short-circuit detection device 4 of the LED illumination system of the second embodiment. Since it is the same as that of embodiment, the description is abbreviate
  • the button of the trigger input unit 46 is connected with the power supply unit 2 and the lighting device main body 1 connected with the connection cord 3 that preferably supplies power at the actual installation location as shown in FIG.
  • the control unit 43 performs reference data creation processing according to the program.
  • the reference data creation process is performed in one stage after receiving the trigger signal (step 3-1) and in the state where no current flows through each LED unit 10 as in the first embodiment.
  • the dimming input unit 23 is controlled so that each constant current circuit 24 passes the current amount of each eye to each LED unit 10, and each LED unit 10 is turned on for reference measurement (step 3-2).
  • the control unit 43 receives the potential at the second position (reference potential) detected by the detection element 42 and stores it in the storage unit 44 in correspondence with the dimming level (step 3-3).
  • the dimming input unit 23 is sequentially controlled so that each constant current circuit 24 flows the current amount of the second stage to the sixteenth stage to each LED unit 10. Then, each LED unit 10 is turned on for reference measurement, and the control unit 43 receives the potential (reference potential) at the second position detected by each detection element 41 in each state, and each dimming level is stored in the storage unit 44. Are stored in correspondence with each other (step 3-4).
  • the measurement result of the temperature sensor 49 is stored in the storage unit 44 (step 3-5). The measurement result of the temperature sensor 49 is associated with each reference potential difference.
  • the measurement result of the temperature sensor 49 is stored in the storage unit 44 after step 3-4, but the measurement result of the temperature sensor 49 corresponding to each dimming is stored in the storage unit 44 at each step 3-3. You may store in. As a result, reference data as shown in FIG. 9 is created and stored in the storage unit 44.
  • the control unit 43 When the LED lighting system is normally operated after the reference data is created in this way, the control unit 43 performs short circuit abnormality detection according to the program, and the control unit 43 displays the result on the display unit 47, or The control unit 43 transmits a signal indicating the result to the outside.
  • This short-circuit abnormality detection is performed by comparing the measured potential at the second position with the reference potential of the corresponding dimming level in the reference data for each LED unit 10 during normal operation. The position is determined, and the presence / absence or state of the LED is detected.
  • the threshold is set for each dimming state based on the reference potential, and is further set for each LED unit 10 based on the reference data of each LED unit 10.
  • the control unit 43 controls the reference potential and the dimming level of the first dimming level.
  • the reference potential between the first and second stages is interpolated using the reference potential of the second stage, and the same interpolation is also performed for the threshold value. To detect.
  • this LED lighting system connects the lighting device body 5, the power supply unit 6 as a power supply unit, and the lighting device body 5 and the power supply unit 6 to illuminate from the power supply unit 6. It has the connection cord 3 for supplying power to the apparatus body 5 and the same short-circuit detection apparatus 4 as in the second embodiment.
  • the connection cord 3 supplies a driving voltage to at least the lighting device body 1.
  • the illuminating device main body and the electric power supply unit are changed with respect to 2nd Embodiment, short circuit detection is performed with the short circuit detection apparatus 4 similar to 2nd Embodiment.
  • the illuminating device body 5 has at least one LED unit 50, and in this embodiment, has a plurality of LED units 50 as shown in FIG.
  • Each LED unit 50 has a plurality (for example, 10 or more) of LEDs 51 connected in series, and the plurality of LEDs 51 are mounted on the LED substrate and connected in series.
  • Each LED unit 50 also has a current limiting resistor 52, and other circuit elements can be added.
  • the lighting device body 5 includes a high potential side input terminal 53 connected to the high potential side of each LED unit 50 and a low potential side input terminal 54 connected to the low potential side of each LED unit 50.
  • the power supply unit 6 includes a high potential side terminal 61 that outputs power from a constant voltage PWM (pulse width modulation) DC power source, a low potential side terminal 62, and a dimming input unit 63.
  • the power supply unit 6 supplies power with a duty ratio according to the input of the dimming input unit 63 to the high potential side terminal 61, the connection cord 3, the high potential side input terminal 53, the low potential side input terminal 54, the connection cord 3, and
  • the LED unit 50 is configured to be supplied via the low potential side terminal 62.
  • the dimming input unit 63 may convert a duty ratio signal from an operation unit operated by hand into a digital signal and send it to the control unit 43 described below.
  • a digital signal for adjusting a duty ratio input from the outside May be a signal input unit that sends the signal to the control unit 43 described below, or may have both of them.
  • Each first detection element 41 of the short-circuit detection device 4 is arranged so as to detect a potential (potential at the first position) on the higher potential side input terminal 53 side than the LED 51 on the highest potential side in each LED unit 50.
  • Each second detection element 42 is arranged so as to detect a potential on the lower potential side input terminal 54 side (potential at the second position) than the LED 51 on the lowest potential side in each LED unit 50.
  • the dimming digital signal from the dimming input unit 63 is sent to the control unit 43 by the dimming value input unit 45.
  • a method of measuring an actual driving current flowing through each LED unit 10 instead of the dimming digital signal and transmitting the measured value to the control unit 43 is also conceivable.
  • a current measuring unit is provided.
  • the current measurement unit performs current measurement using, for example, the potential on the high potential side of the current detection resistor of the constant current circuit.
  • the control unit 43 operates based on a program stored in the storage unit 44, and specifically performs the following operations.
  • the button of the trigger input unit 46 is operated in a state where the power supply unit 6 and the lighting device main body 5 are connected with the connection cord 3 that preferably supplies power at the actual installation location as shown in FIG.
  • the control unit 43 performs reference data creation processing according to the program. You may comprise so that a trigger signal may be sent to the control part 43 from the trigger input part 46, when the electric power supply unit 6 and the illuminating device main body 5 are connected and predetermined time passes.
  • the dimming input unit 63 is controlled so that the power supply unit 6 supplies power to the LED units 50 with a predetermined duty ratio. Then, each LED unit 50 is turned on for reference measurement (step 4-2). In this state, the potentials of the first and second positions detected by the detection elements 41 and 42 (a voltage is applied to each LED unit 50). Potential difference) (reference potential difference) is received by the control unit 43 and stored in the storage unit 44 (step 4-3). The measurement result of the temperature sensor 49 at that time is also stored in the storage unit 44 in correspondence with the reference potential difference (step 4-4). As a result, reference data as shown in FIG. 11 is created and stored in the storage unit 44. Here, instead of the potential difference between the first and second positions, the potentials at the first and second positions can be stored as they are in the storage unit 42 as reference data.
  • the control unit 43 When the LED lighting system is normally operated after the reference data is created in this way, the control unit 43 performs short circuit abnormality detection according to the program, and the control unit 43 displays the result on the display unit 47, or The control unit 43 transmits a signal indicating the result to the outside.
  • This short-circuit abnormality detection is performed by comparing the measured potential difference between the first and second positions with the reference potential difference in the reference data for each LED unit 50 during normal operation, and the difference between the measured potential difference and the reference potential difference is the same as in the second embodiment. In addition, it is determined which position is located with respect to the first threshold value, the second threshold value, and the third threshold value, thereby detecting the presence or absence or the state of the LED short circuit.
  • the first to third threshold values are compared with respect to the temperature difference between one of the actually measured potential difference and the reference potential difference and the other, and a short circuit abnormality is determined.
  • Reference data is prepared for each of the plurality of LED units 50.
  • a potential difference correction value is obtained by applying a predetermined coefficient or a predetermined temperature compensation arithmetic expression to the temperature difference between the temperature associated with the reference potential difference of the reference data and the measurement result of the temperature sensor 49 when measuring the actual potential difference.
  • the potential difference correction value is applied to one of the actually measured potential difference and the reference potential difference, and then compared with the first to third threshold values.
  • a predetermined coefficient a temperature coefficient determined by the type of LED can be used. This coefficient measures the temperature characteristics of the plurality of LEDs 51 and uses the average value of the measured temperature characteristics.
  • short-circuit detection is performed in consideration of the temperature characteristics of each LED 51 in addition to the resistance of the connection cord of the LED lighting system arranged in a wide space such as a factory and the manufacturing factor variation of the LED voltage drop. Is possible.
  • the first detection element of the short-circuit detection device 4 can be omitted. Even in this case, when the button of the trigger input unit 46 is operated in a state where the power supply unit 6 and the lighting device main body 5 are connected by the connection cord 3 that supplies power at the installation location where the power supply unit 6 is actually installed, The control unit 43 performs reference data creation processing.
  • the reference data creation process is performed so that the power supply unit 6 supplies power to each LED unit 50 with a predetermined duty ratio after receiving the trigger signal (step 5-1).
  • the light input unit 63 is controlled to light each LED unit 50 for reference measurement (step 5-2), and in this state, the potential at the second position (reference potential) detected by each detection element 42 is controlled by the control unit 43.
  • the storage unit 44 step 5-3
  • the measurement result of the temperature sensor 49 at that time is also stored in the storage unit 44 in correspondence with the reference potential (step 5-4).
  • reference data is created and stored in the storage unit 44.
  • the control unit 43 When the LED lighting system is normally operated after the reference data is created in this way, the control unit 43 performs short circuit abnormality detection according to the program, and the control unit 43 displays the result on the display unit 47, or The control unit 43 transmits a signal indicating the result to the outside.
  • This short-circuit abnormality detection is performed by comparing the measured potential at the second position with the reference potential of the reference data for each LED unit 50 during normal operation, and determining which position of the measured potential and the reference potential is relative to the threshold value. Judgment is made to detect whether or not the LED is short-circuited.
  • the threshold value is set for each LED unit 10 based on the reference data of each LED unit 10. Even in this case, it is possible to perform short-circuit detection in consideration of the resistance of the connection cord of the LED lighting system arranged in a wide space such as a factory or the manufacturing factor variation of the LED voltage drop.
  • the first potential is measured for each LED unit, but only one of the LED units is measured for the first potential. It is possible to use the first potential as the first potential of another LED unit. Further, in each of the above embodiments, the LED unit is dimmed using a constant current circuit or the dimming is performed using PWM control. However, when the constant current control or the constant voltage control is performed by another method, Even so, it is possible to detect the short circuit of the LED as described above by the technique shown in each of the embodiments and the equivalent technique.
  • SYMBOLS 1 Illuminating device main body, 2 ... Electricity supply unit, 3 ... Connection cord, 4 ... Short circuit detection device, 10 ... LED unit, 11 ... LED, 13 ... High potential side input terminal, 14 ... Low potential side input terminal, 21 ... High potential side terminal, 22 ... Low potential side terminal, 23 ... Dimming input unit, 24 ... Constant current circuit, 41 ... First detection element, 42 ... Second detection element, 43 ... Control unit, 44 ... Storage unit, 45 ... Dimming value input unit, 46 ... Trigger input unit, 47 ... Display unit, 48 ... Sequential connection circuit, 49 ... Temperature sensor

Landscapes

  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

L'invention concerne un dispositif de détection d'anomalie de court-circuit pour système d'éclairage à DEL, un dispositif d'éclairage à DEL doté du dispositif en question, et un procédé de détection d'anomalie de court-circuit pour système d'éclairage à DEL, le dispositif de détection d'anomalie de court-circuit étant capable de détecter avec exactitude une anomalie de court-circuit dans une unité à DEL dotée d'une pluralité de DEL reliées en série. Lorsqu'une unité (2) d'alimentation et un corps principal (1) de dispositif d'éclairage sont raccordés via un cordon (3) de raccordement fournissant une alimentation provenant de l'unité (2) d'alimentation au corps principal (1) de dispositif d'éclairage, ce dispositif de détection d'anomalie de court-circuit fait en sorte qu'une unité (10) à DEL s'allume dans un état allumé prédéterminé en vue d'une mesure de référence, construit des données de référence d'après le potentiel électrique au niveau d'une première position et le potentiel électrique au niveau d'une deuxième position et, pendant le fonctionnement du système d'éclairage à DEL, compare aux données de référence les potentiels électriques au niveau des première et deuxième positions ou à la différence entre ces deux potentiels électriques, détectant ainsi un court-circuit dans une ou plusieurs DEL (11) de l'unité (10) à DEL.
PCT/JP2017/009107 2016-03-25 2017-03-07 Dispositif de détection d'anomalie de court-circuit pour système d'éclairage à del, dispositif d'éclairage à del doté dudit dispositif, et procédé de détection d'anomalie de court-circuit pour système d'éclairage à del WO2017163862A1 (fr)

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JP2016062388A JP6896215B2 (ja) 2016-03-25 2016-03-25 Ｌｅｄ照明システムの短絡異常検出装置、その装置を有するｌｅｄ照明装置、およびｌｅｄ照明システムの短絡異常検出方法
JP2016-062388 2016-03-25

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EP4108088A1 (fr) * 2021-06-25 2022-12-28 Günther Maschinenbau GmbH Agencement de capteur dans une machine de traitement des aliments

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