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WO2018021286A1 - Dispositif de source d'énergie destiné à l'émission de lumière stroboscopique à del - Google Patents

Dispositif de source d'énergie destiné à l'émission de lumière stroboscopique à del Download PDF

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Publication number
WO2018021286A1
WO2018021286A1 PCT/JP2017/026827 JP2017026827W WO2018021286A1 WO 2018021286 A1 WO2018021286 A1 WO 2018021286A1 JP 2017026827 W JP2017026827 W JP 2017026827W WO 2018021286 A1 WO2018021286 A1 WO 2018021286A1
Authority
WO
WIPO (PCT)
Prior art keywords
led
current
strobe light
charge
storage element
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2017/026827
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English (en)
Japanese (ja)
Inventor
裕一郎 田中
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CCS Inc
Original Assignee
CCS Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by CCS Inc filed Critical CCS Inc
Publication of WO2018021286A1 publication Critical patent/WO2018021286A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B15/00—Special procedures for taking photographs; Apparatus therefor
    • G03B15/02—Illuminating scene
    • 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
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B15/00—Special procedures for taking photographs; Apparatus therefor
    • G03B15/02—Illuminating scene
    • G03B15/03—Combinations of cameras with lighting apparatus; Flash units
    • G03B15/05—Combinations of cameras with electronic flash apparatus; Electronic flash units

Definitions

  • the present invention relates to a power supply device for LED strobe light emission used for surface inspection or the like.
  • the LED can emit light with high brightness by flowing a current several times the rated value in a short time and when a considerable rest period is available (for example, 10 ms or less and a duty ratio of 1/10 or less).
  • a power supply device that supplies current to the strobe light emitting device is required to have a function capable of instantaneously supplying a large current during strobe light emission.
  • a large-capacity capacitor is provided, and the LED is During the light-off period, the capacitor is charged from a continuous current source, and a large current is emitted from the capacitor to the LED during light emission.
  • the power supply device theoretically assumes 48V if the efficiency is ignored.
  • a current that can be output and that can be continuously supplied is 1 A, that is, a current that can output 48 W is used (in reality, there is no 100% efficiency, so the capacity is a little larger).
  • FIG. 3 shows changes in the current waveform and charge amount of the capacitor at this time.
  • the power supply device described above can be used for an LED strobe light emitting device having a lower rated power as a matter of course.
  • the user uses an LED strobe light emitting device having a small capacity (low power) (for example, a device in which strobe light emission is performed at 48 V, 5 A and operated at a duty ratio of 1/10).
  • a small capacity for example, a device in which strobe light emission is performed at 48 V, 5 A and operated at a duty ratio of 1/10.
  • the average current required for the LED strobe light emitting device is 0.5 A, so that the external power supply equipment of the user can supply 0.5 A or slightly larger current accordingly.
  • FIG. 3 shows changes in the current waveform and charge amount of the capacitor at this time.
  • the external power supply cannot supply the current of 1A, as a result, the voltage of the external power supply may be reduced, or the operation of the power supply may be stopped due to an error. That is, although the power consumption of the LED strobe light emitting device is sufficiently large enough to cover the power consumption, there is a problem that the power supply device interposed between the LED strobe light emitting device may hinder the operation.
  • the present invention has been made in view of such problems, and does not require an excessively large current from the outside, and operates with an LED strobe light-emitting power supply that operates with a current according to the capacity of the connected LED. Is intended to provide.
  • the power supply device for LED strobe light emission supplies a current to a connected LED with at least a predetermined rest period to cause the LED to strobe light, and includes a continuous current source, A storage element connected to the continuous current source and connected to the LED to supply current to the LED when the LED emits strobe light, and to be charged with electric charge from the continuous current source in the pause period, and in the pause period And a current control unit that variably controls the charge current to the power storage element.
  • the current control unit determines a charge current to the power storage element based on a charge amount of the power storage element discharged by the strobe light emission.
  • the current control unit The charge current may be a value obtained by dividing the charge amount of the storage element discharged by the strobe light emission by the rest period.
  • the schematic diagram of the power supply device in one Embodiment of this invention The graph which shows the time change of the current waveform of a capacitor
  • the LED illumination system 100 in this embodiment is used for surface inspection of a workpiece, and as shown in FIG. 1, an LED strobe light emitting device 1 (hereinafter also simply referred to as a light emitting device 1) and this light emission.
  • An LED strobe light-emitting power supply device 2 (hereinafter also simply referred to as a power supply device 2) that supplies power to the device 1 is provided.
  • the light emitting device 1 includes LEDs 11 arranged in series or in parallel. These LEDs 11 are those that can emit strobe light by overdrive. In addition, this light-emitting device 1 can also make LED11 light-emit continuously other than strobe light emission.
  • the power supply device 2 is continuously supplied with electric power from an external power supply facility PS (for example, a DC power supply facility installed in a factory, an AC-DC converter, etc.), converted into direct current, and supplied to the light emitting device 1
  • PS for example, a DC power supply facility installed in a factory, an AC-DC converter, etc.
  • a current source 3 a capacitor 4 that is connected to the continuous current source 3 and that additionally supplies current to the light emitting device 1 during strobe light emission, and a control circuit 5 that controls the strobe light emission timing are provided. Yes.
  • the continuous current source 3 is, for example, a DC / DC converter, and an external power supply facility PS provided on the user side is connected to an input terminal thereof, and an output terminal thereof is connected to the light emitting device 1 via an electric cable. It is connected to the anode of the LED 11 provided.
  • a CVCC type capable of variably adjusting the voltage / current is used here, but an adjustment circuit for variably adjusting the voltage / current is provided separately from the DC / DC converter. May be.
  • the capacitor 4 has a large capacity such as a film capacitor or an aluminum electrolytic capacitor. As described above, one end of the capacitor 4 is connected to the output terminal of the continuous current source 3, and the other end is connected to the ground. It is comprised so that an electric charge can be supplied to LED11.
  • the control circuit 5 causes the LED 11 to emit strobe light with a predetermined light emission time and a predetermined duty ratio.
  • the control circuit 5 includes a switch element 52 provided on the current line of the LED 11 and an information processing device 51. It is configured.
  • the switch element 52 is, for example, a MOSFET, but a bipolar transistor or the like may be used.
  • the information processing apparatus 51 is, for example, an analog / digital mixed circuit including a CPU, a memory, an AD converter, a DA converter, an amplifier, and the like (not shown).
  • the CPU and its peripheral devices cooperate in accordance with a predetermined program stored in the memory.
  • the switch element 52 By operating, the switch element 52 generates a control signal to turn it on / off, and the LED lighting control unit 7 for controlling the blinking timing of the LED 11 and the current command signal and the voltage command signal to the continuous current source 3.
  • the LED lighting control unit 7 for controlling the blinking timing of the LED 11 and the current command signal and the voltage command signal to the continuous current source 3.
  • the output voltage and output current of the continuous current source 3 are set by initial setting or subsequent setting by user input or communication from other devices. And the value is stored in a predetermined area of the memory.
  • the information processing apparatus 51 when receiving an operation start command from the user, the information processing apparatus 51 operates the continuous current source 3 with the LED 11 turned off to fully charge the capacitor 4. Next, the information processing device 51 (LED lighting control unit 7) issues an ON control signal to the switch element 52 to make the LED 11 strobe light only once in a test.
  • the information processing device 51 calculates the charge discharged from the capacitor 4. That is, the information processing device 51 detects the current flowing through the LED during strobe light emission, and calculates the discharge charge amount by performing time integration. Then, a minimum current for charging the discharge amount in one pause period, that is, a time during which no strobe light is emitted in one duty cycle is calculated. For this purpose, the information processing apparatus 51 sets the minimum charge current as a value obtained by dividing the calculated discharge charge amount by the pause period. Finally, the minimum charge current calculated in this way, or a current slightly larger than that obtained by multiplying (or adding) a predetermined safety factor is set as the output current of the continuous current source 3.
  • a current detection circuit 6 is provided in order to detect a current flowing through the LED 11.
  • the current detection circuit 6 has a function of a resistance element having one end connected to the switch element 52 and the other end connected to the ground. One end of the resistance element becomes an output end, and the voltage becomes a current index value indicating the current flowing through the LED 11.
  • the information processing device 51 acquires the output voltage of the current detection circuit 6 and calculates a current from the value.
  • the power supply device 2 can be applied to the LEDs 11 having various capacities without excessively demanding an excessively large current for the external power supply facility PS.
  • the discharge amount may be calculated from the output terminal voltage of the capacitor, for example.
  • the discharge amount can be calculated by integrating the value obtained by multiplying the capacitance of the capacitor and the output terminal voltage by the strobe light emission time.
  • the type of the LED strobe light emitting device and the minimum charge current during the rest period required in advance are stored in pairs in a memory, and the type of the connected LED strobe light emitting device is determined by the user. This may be recognized by input or automatic identification, and the current control unit may refer to the table and set the minimum charge current, that is, the operating current of the continuous current source.
  • Test flash firing may be performed multiple times before starting operation. In that case, an average charge current or a maximum charge current obtained by the test strobe emission may be set as the operating current.
  • Test flash emission may be performed only at the time of installation, or may be performed before the start of each operation to update the operating current each time.
  • the LED strobe light emitting device is not only used for work surface inspection as in the above-described embodiment, but also can be applied to, for example, exposure, spectrometer, and other general illumination.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Stroboscope Apparatuses (AREA)
  • Studio Devices (AREA)

Abstract

La présente invention concerne un dispositif de source d'énergie destiné à l'émission de lumière stroboscopique à DEL qui fonctionne sur un courant basé sur la capacité d'une DEL connectée. Le dispositif de source d'énergie est pourvu des éléments suivants : des sources de courant en série (3) ; un élément de stockage d'électricité (4) qui est connecté aux sources de courant en série (3) et à une DEL (11), qui fournit du courant à la DEL (11) pendant l'émission de lumière stroboscopique, et qui est chargé par les sources de courant en série (3) pendant une période de pause ; et une unité de commande de courant (7) qui commande de manière variable le courant de charge vers l'élément de stockage d'électricité (4) pendant la période de pause.
PCT/JP2017/026827 2016-07-29 2017-07-25 Dispositif de source d'énergie destiné à l'émission de lumière stroboscopique à del Ceased WO2018021286A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2016150305A JP6777449B2 (ja) 2016-07-29 2016-07-29 Ｌｅｄストロボ発光用電源装置
JP2016-150305 2016-07-29

Publications (1)

Publication Number Publication Date
WO2018021286A1 true WO2018021286A1 (fr) 2018-02-01

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2017/026827 Ceased WO2018021286A1 (fr) 2016-07-29 2017-07-25 Dispositif de source d'énergie destiné à l'émission de lumière stroboscopique à del

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JP (1) JP6777449B2 (fr)
WO (1) WO2018021286A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3641292A1 (fr) * 2018-10-18 2020-04-22 Aptiv Technologies Limited Caméra pour système de vision de véhicule

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06102564A (ja) * 1992-09-22 1994-04-15 Olympus Optical Co Ltd ストロボ充電電流制御回路
JPH06205253A (ja) * 1993-09-01 1994-07-22 Olympus Optical Co Ltd ストロボ充電制御回路
JP2015154698A (ja) * 2014-02-19 2015-08-24 キヤノン株式会社 充電制御装置、撮像装置、及び充電制御方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06102564A (ja) * 1992-09-22 1994-04-15 Olympus Optical Co Ltd ストロボ充電電流制御回路
JPH06205253A (ja) * 1993-09-01 1994-07-22 Olympus Optical Co Ltd ストロボ充電制御回路
JP2015154698A (ja) * 2014-02-19 2015-08-24 キヤノン株式会社 充電制御装置、撮像装置、及び充電制御方法

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JP6777449B2 (ja) 2020-10-28
JP2018018782A (ja) 2018-02-01

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