WO2015128986A1 - Led light emission device - Google Patents

Led light emission device Download PDF

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Publication number
WO2015128986A1
WO2015128986A1 PCT/JP2014/054858 JP2014054858W WO2015128986A1 WO 2015128986 A1 WO2015128986 A1 WO 2015128986A1 JP 2014054858 W JP2014054858 W JP 2014054858W WO 2015128986 A1 WO2015128986 A1 WO 2015128986A1
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Prior art keywords
light emitting
voltage
light
emitting diode
circuit
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PCT/JP2014/054858
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French (fr)
Japanese (ja)
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剛士 石川
光晴 石原
彌永　秋彦
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有限会社トップス
ユニオン電子工業株式会社
アドバンスドメディカル株式会社
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Application filed by 有限会社トップス, ユニオン電子工業株式会社, アドバンスドメディカル株式会社 filed Critical 有限会社トップス
Priority to PCT/JP2014/054858 priority Critical patent/WO2015128986A1/en
Priority to JP2014512196A priority patent/JPWO2015128986A1/en
Publication of WO2015128986A1 publication Critical patent/WO2015128986A1/en

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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
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/40—Details of LED load circuits
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix
    • 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
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/40—Details of LED load circuits
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix
    • H05B45/48—Details of LED load circuits with an active control inside an LED matrix having LEDs organised in strings and incorporating parallel shunting devices

Definitions

  • the present invention relates to an LED light emitting device that efficiently emits light from a plurality of light emitting diodes.
  • Patent Document 1 (Utility Model Registration No. 3167927) provides a constant current LED lamp that greatly simplifies the circuit architecture of the drive, uses sufficient power, reduces power loss, and eliminates electromagnetic interference.
  • the constant current LED lamp is used to drive a light emitting diode of at least two series connected or a packaged polycrystalline series light emitting diode by installing a driving device. And a voltage stabilizing circuit and a constant current circuit.
  • the rectifier circuit is used for receiving AC power and converting AC power to DC power.
  • the filter circuit is connected to the rectifier circuit and reduces a difference in voltage amplitude of the DC power supply.
  • the drive device of the present invention brings the series voltage of each light emitting diode close to the input voltage, moves each light emitting diode by the input power supply, sufficiently uses power to reduce power loss, and eliminates interference of electromagnetic waves. It is something that can be done.
  • Patent Document 2 Japanese Patent Laid-Open No. 2010-563164 discloses a light emitting diode driving circuit that stably drives an LED in a wide voltage range, and a light emitting device and a lighting device using the same.
  • This drive circuit drives an LED array including a plurality of LEDs connected in series, and this power supply supplies a DC drive voltage to the plurality of LEDs.
  • the first constant current circuit is provided on the drive path of the plurality of LEDs, stabilizes the drive current flowing through the LEDs, the bypass switch is provided in parallel with at least one LED of the plurality of LEDs, and the control unit includes: The bypass switch is on / off controlled.
  • the voltage across the constant current circuit becomes smaller and it becomes impossible to generate a predetermined constant current, and the voltage drop of each light emitting diode decreases and the luminance starts to decrease.
  • the voltage across the constant current circuit increases and the voltage drop of the individual light emitting diodes increases, so that the brightness of the individual light emitting diodes can be maintained It is.
  • Japanese Patent Application Laid-Open No. 2013-542550 discloses a semiconductor lighting driver and system having a total harmonic distortion bypass circuit.
  • the system is an illumination drive circuit having a current drive circuit and a bypass circuit, the current drive circuit being coupled to an AC power source having an output cycle and having a first illumination segment and a second illumination segment.
  • a drive circuit is configured to supply current to the power source.
  • the input of the second lighting segment is directly coupled to the output of the first lighting segment, and the bypass circuit is connected to the current drive circuit and is configured to be coupled to the input of the second lighting segment, during the output cycle
  • the bypass circuit is configured to supply a bypass current from the drive circuit to the second lighting segment over time.
  • the total harmonic distortion bypass circuit bypasses the first illumination segment of the LED and energizes the second illumination segment, so that the semiconductor turbulence emits light for the majority of the output cycle, producing a total harmonic. Wave distortion can be reduced.
  • Patent Document 4 Japanese Patent Laid-Open No. 2007-242494 discloses an AC-DC converter connected to a trademark power source, and an LED element substrate on which light-emitting diodes that emit light by a DC power source converted by the AC-DC converter are arranged.
  • the light guide that diffuses the light from each light-emitting diode is charged when the trademark power supply is electrically connected, and is discharged toward the light-emitting diode when the electrical connection is broken
  • LED light emitting marker device comprising: a battery power supply; a constant current supply means for supplying a constant current to the light emitting diode between the LED element substrate and the commercial power supply; and a control means for controlling an output current value of the constant current supply means. I will provide a.
  • the conventional LED light-emitting devices are made to respond by changing the amount of the diode that emits light according to the fluctuation of the input voltage.
  • the LED light-emitting device described in the cited document 4 is driven at a constant voltage (current) using an AC-DC converter.
  • an object of the present invention to provide an LED light-emitting device that includes only an analog circuit without using an AC-DC converter.
  • the present invention comprises a rectifier circuit for rectifying an AC power supply, and a light emitting diode and switch means for turning on and off the corresponding light emitting diode connected in parallel to the light emitting diode, and between the terminals of the rectifier circuit.
  • a light emitting unit connected in series, a constant current circuit connected in series downstream of a plurality of light emitting units connected in series, and a minimum voltage of the constant current circuit connected in parallel to the constant current circuit
  • the light emitting unit can be caused to emit light sequentially in accordance with, for example, a rise in the voltage of the rectified AC waveform due to the fluctuation of the voltage generated between the terminals of the rectifier circuit. Is something that can be done.
  • the switch means is preferably a field effect transistor.
  • the voltage holding means is a Zener diode.
  • a light emitting diode group configured by connecting light emitting diodes in series is disposed upstream of the plurality of light emitting units.
  • the number of LEDs to be lit can be controlled according to the input voltage, so that the power factor of the varying power source can be set to 1. Further, since no AC-DC converter is used, all the problems derived from the AC-DC converter described above can be avoided.
  • the LED light emitting device 1 includes a rectifier circuit 3 connected to an AC power source 2 via a fuse F1.
  • the rectifier circuit 3 is composed of four diodes D1 to D4.
  • the voltage Em generated between the output terminals 4 and 5 of the rectifier circuit 3 is rectified by the alternating current and has a waveform as shown in FIG.
  • the light emitting units 6 to 45 are light emitting diodes LD1 to LD40 connected in series from the output terminal 4, respectively, and field effect transistors (FETs) connected in parallel to the light emitting diodes LD1 to LD40 to turn on and off the light emitting diode LD1. ) Q1 to Q40.
  • the anode terminal of the light emitting diode LD1 of the light emitting unit 6 is connected to the output terminal 4, the cathode terminal of the light emitting diode LD1 is connected to the anode terminal of the light emitting diode LD2 of the next light emitting unit 7, and the light emitting diodes are sequentially connected in series. Connected.
  • the FETs Q1 to Q40 of the light emitting units 6 to 45 are connected in parallel to the light emitting diodes LD1 to LD40 of the light emitting units 6 to 45, respectively. Further, voltage maintaining resistors R2 to R41 are provided between the gates and the sources of the FETs Q1 to Q40, respectively, and a minimum voltage (for example, 4 V) set by the resistor R1 and the Zener diode D45 is applied to the gate terminal. The Also, diodes D5 to D45 are provided at the gate terminals of the FETs Q1 to Q40 so as not to exceed the gate-drain breakdown voltage of the FETs Q1 to Q40. However, the gate and drain are clamped at the same potential by R2 to R41.
  • the constant current circuit 50 includes a field effect transistor Q41, a transistor Q42, and resistors R42 and R43, and is connected to the downstream side of the light emitting units 6 to 44.
  • the voltage Em between the output terminals 4 and 5 of the rectifier circuit 3 varies between 0V and 141V in the case of commercial power supply AC100V. If the voltage Em is equal to or lower than the voltage Vd (for example, 4V) set to the lowest voltage of the constant current circuit 50 by the resistor R1 and the Zener diode D45 + the driving voltage Vf (for example, 3V) of the light emitting diode, the light emitting diodes LD1 to LD40. Does not emit light.
  • Vd for example, 4V
  • the anode voltage of the light emitting diode LD1 becomes 10V and the cathode voltage becomes 7V, and the gate of the FET Q1 becomes higher than the voltage Vd, so the FET Q1 is turned OFF and the light emitting diode LD1.
  • the anode voltage of the light emitting diode LD2 is 7V
  • the cathode voltage is 4V
  • the source voltage of the FET Q2 is 4V.
  • the gate voltage of the FET Q2 becomes equal to the voltage Vd of the constant current circuit 50, so that the FET Q2 is turned off and the light emitting diode LD2 is lit.
  • the cathode voltage of the light emitting diode LD3 becomes 1V when a current flows.
  • the voltage Vd is 3V higher than the cathode voltage
  • the FET Q3 is turned on, so that the light emitting diode LD3 is turned off. Since this operation occurs sequentially in the light emitting units 4 to 40, the light emitting diodes LD4 to LD40 are sequentially turned off.
  • the light emitting diodes sequentially emit light. Further, when the input voltage Em decreases, the light emitting diodes are sequentially turned off. This lighting and extinction is repeated 100 times per second for 50 cycle alternating current and 120 times for 60 cycle alternating current, so that sufficient illuminance can be maintained as a whole. Furthermore, since the light emitting diode is automatically selected in accordance with the voltage fluctuation and emits light, the power factor of the power source can be set to 1.
  • the LED light emitting device 1A includes a charging capacitor C2 between the output terminals 4 and 5 of the rectifier circuit 3, and a predetermined number of light emitting diodes LD41 to LD70.
  • a charging capacitor C2 between the output terminals 4 and 5 of the rectifier circuit 3, and a predetermined number of light emitting diodes LD41 to LD70.
  • a group of light emitting diodes 60 connected in series. Thereby, even if the input voltage Em falls to 0V, the light emitting diode group 60 is always lit by the voltage VA charged by the capacitor C2.
  • light emitting units 61 to 74 are connected in series on the downstream side of the light emitting diode group 60, and a constant current circuit 50A is further connected on the downstream side thereof.
  • the light emitting units 61 to 74 are configured by light emitting diodes LD71 to LD82, FETs G43 to Q54, resistors R45 to R56, and diodes D50 to D61, respectively.
  • the ripple component VB of the capacitor C2 as shown in FIG. 5 is controlled by the light emitting units 61 to 74 by the operation described in the first embodiment.
  • the power factor is about 0.6 to 0.7.
  • the light emitting diode group 60 is always lit by the voltage VA generated by the capacitor C2, and the ripple voltage VB generated by the capacitor C2 is emitted in series with the light emitting diode group 60. It is controlled by the units 61 to 74. In other words, the light emitting units 61 to 74 emit light sequentially following the top and bottom of the ripple voltage VB and sequentially turn off. As a result, the LED light emitting device 1A according to the second embodiment can achieve the same effects as the LED light emitting device 1 of the first embodiment.
  • the LED light emitting device 1B according to the third embodiment of the present invention is similar to the LED light emitting device 1A according to the second embodiment in that the light emitting diode group 80 includes the charging capacitor C3 and the light emitting diodes LD83 to LD117 connected in series. And light emitting units 81 to 88 connected in series to the downstream side of the light emitting diode group 80, and a constant current circuit 50B connected to the downstream side of the light emitting units 81 to 88.
  • the LED light emitting device 1B according to the third embodiment is characterized in that the light emitting units 81 to 88 according to the third embodiment omit the gate-source resistance and the diode from the light emitting units of the first and second embodiments. It is. This is the gate of the ripple voltage FETQ61 ⁇ Q68 connected in series to the variation of VB - is obtained so as to control the breakdown voltage of the voltage V G-S between the source. This has the effect of reducing the number of parts of the light emitting portions 81 to 88.
  • the present invention has a structure in which the light emission of the light emitting diode can be controlled by a change in voltage, so that the light emission of a plurality of light emitting diodes can be controlled by creating a voltage control program. It is possible to control advertising lights, indicator lights, etc. only by a pair of wires for supplying voltage. In addition, since this program can be easily configured, the burden on the CPU is low.

Abstract

The invention of the present application provides an LED light emission device comprising only an analog circuit, without an AC-DC converter being used. The present invention comprises at least: a rectifier circuit (3) for rectifying an AC power supply (2); light-emitting units (6-45) serially connected between terminals (4, 5) of the rectifier circuit (3), each of the light-emitting units (6-45) comprising a light-emitting diode (LD1-LD40) and a switching means (Q1-Q40) that is connected in parallel to the light-emitting diode (LD1-LD40) and switches the corresponding light-emitting diode (LD1-LD40) on or off; a constant current circuit (50) serially connected downstream of the serially connected light-emitting units (6-45); and a voltage holding means (D45) connected in parallel to the constant current circuit (50) and set to the minimum voltage of the fixed current circuit (50).

Description

ＬＥＤ発光装置LED light emitting device
　本願発明は、複数の発光ダイオードを効率的に発光させるＬＥＤ発光装置に関する。 The present invention relates to an LED light emitting device that efficiently emits light from a plurality of light emitting diodes.
　特許文献１（実用新案登録第３１６７９２７号公報）は、駆動装置の回路アークテクチャーを大幅に簡素化し、十分な電力を利用し、電力損失を減らし、且つ電磁干渉をなくす定電流ＬＥＤランプを提供することを目的とする。このため、定電流ＬＥＤランプは、駆動装置を設置し、少なくとも二直列連接の発光ダイオードか、若しくはパッケージングした多結晶直列の発光ダイオードを駆動するのに用いられるものであり、整流回路、フィルター回路、電圧安定回路及び定電流回路から構成される。前記整流回路は、交流電源を受け、且つ交流電源を直流電源に転換するために用いられる。前記フィルター回路は、前記整流回路に連接され、直流電源の電圧振幅の差を縮小する。このように、この考案の駆動装置は、各発光ダイオードの直列電圧を入力電圧に近づけ、入力電源で各発光ダイオードを動かし、十分に電力利用して電力ロスを減らし、且つ電磁波の干渉をなくすことができるものである。 Patent Document 1 (Utility Model Registration No. 3167927) provides a constant current LED lamp that greatly simplifies the circuit architecture of the drive, uses sufficient power, reduces power loss, and eliminates electromagnetic interference. For the purpose. Therefore, the constant current LED lamp is used to drive a light emitting diode of at least two series connected or a packaged polycrystalline series light emitting diode by installing a driving device. And a voltage stabilizing circuit and a constant current circuit. The rectifier circuit is used for receiving AC power and converting AC power to DC power. The filter circuit is connected to the rectifier circuit and reduces a difference in voltage amplitude of the DC power supply. As described above, the drive device of the present invention brings the series voltage of each light emitting diode close to the input voltage, moves each light emitting diode by the input power supply, sufficiently uses power to reduce power loss, and eliminates interference of electromagnetic waves. It is something that can be done.
　特許文献２（特開２０１０－５６３１４号公報）は、広い電圧範囲で、ＬＥＤを安定に駆動する発光ダイオードの駆動回路、それを用いた発光装置および照明装置を開示する。この駆動回路は、直列に接続された複数のＬＥＤを含むＬＥＤアレイを駆動するもので、この電源は、複数のＬＥＤに直流の駆動電圧を供給する。第１定電流回路は、複数のＬＥＤの駆動経路上に設けられ、ＬＥＤに流れる駆動電流を安定化させ、バイパススイッチは、複数のＬＥＤの少なくとも１つのＬＥＤと並列に設けられ、制御部が、バイパススイッチをオンオフ制御するものである。この装置において、駆動電圧が低下するにしたがい、定電流回路の両端間の電圧が小さくなって所定の定電流を生成できなくなり、個々の発光ダイオードの電圧降下が低下して輝度が低下し始めるが、発光ダイオードの少なくとも１つをバイパスすることによって、定電流回路の両端間の電圧が大きくなり、個々の発光ダイオードの電圧降下が増大するため、個々の発光ダイオードの輝度を維持することができるものである。 Patent Document 2 (Japanese Patent Laid-Open No. 2010-56314) discloses a light emitting diode driving circuit that stably drives an LED in a wide voltage range, and a light emitting device and a lighting device using the same. This drive circuit drives an LED array including a plurality of LEDs connected in series, and this power supply supplies a DC drive voltage to the plurality of LEDs. The first constant current circuit is provided on the drive path of the plurality of LEDs, stabilizes the drive current flowing through the LEDs, the bypass switch is provided in parallel with at least one LED of the plurality of LEDs, and the control unit includes: The bypass switch is on / off controlled. In this device, as the drive voltage decreases, the voltage across the constant current circuit becomes smaller and it becomes impossible to generate a predetermined constant current, and the voltage drop of each light emitting diode decreases and the luminance starts to decrease. By bypassing at least one of the light emitting diodes, the voltage across the constant current circuit increases and the voltage drop of the individual light emitting diodes increases, so that the brightness of the individual light emitting diodes can be maintained It is.
　特許文献３（特表２０１３－５４２５５０号公報）は、全高調波歪みバイパス回路を有する半導体照明ドライバ及びシステムを開示する。このシステムは、電流駆動回路と、バイパス回路とを有する照明駆動回路であり、前記電流駆動回路は、出力サイクルを有する交流電源に結合され、第１照明セグメントと第２照明セグメントとを有する半導体ランプへ電流を供給するように駆動回路が構成されている。第２照明セグメントの入力は第１照明セグメントの出力に直接的に結合され、バイパス回路は電流駆動回路に接続されて、第２照明セグメントの入力に結合されるように構成され、出力サイクル中の時間に駆動回路からのバイパス電流を第２照明セグメントへ供給するようにバイパス回路が構成されている。これによって、駆動電圧が低いときには、全高調波歪みバイパス回路がＬＥＤの第１照明セグメントをバイパスして第２照明セグメントに通電するので、半導体乱舞は出力サイクルの大部分で光線を発して全高調波ゆがみを減少させることができるものである。 Japanese Patent Application Laid-Open No. 2013-542550 discloses a semiconductor lighting driver and system having a total harmonic distortion bypass circuit. The system is an illumination drive circuit having a current drive circuit and a bypass circuit, the current drive circuit being coupled to an AC power source having an output cycle and having a first illumination segment and a second illumination segment. A drive circuit is configured to supply current to the power source. The input of the second lighting segment is directly coupled to the output of the first lighting segment, and the bypass circuit is connected to the current drive circuit and is configured to be coupled to the input of the second lighting segment, during the output cycle The bypass circuit is configured to supply a bypass current from the drive circuit to the second lighting segment over time. Thus, when the drive voltage is low, the total harmonic distortion bypass circuit bypasses the first illumination segment of the LED and energizes the second illumination segment, so that the semiconductor turbulence emits light for the majority of the output cycle, producing a total harmonic. Wave distortion can be reduced.
　特許文献４（特開２００７－２４２４９４号公報）は、商標電源に接続されるＡＣ－ＤＣコンバータと、ＡＣ－ＤＣコンバータで変換されたＤＣ電源によって発光する発光ダイオードが配列されているＬＥＤ素子基板と、各発光ダイオードからの光を拡散する導光体と、商標電源との電気的接続がなされているときに充電されており、この電気的接続が断たれたときに発光ダイオードに向けて放電するバッテリ電源と、ＬＥＤ素子基板と商用電源との間に発光ダイオードに対して定電流を供給する定電流供給手段と、定電流供給手段の出力電流値を制御する制御手段とを備えるＬＥＤ発光標識装置を提供する。 Patent Document 4 (Japanese Patent Laid-Open No. 2007-242494) discloses an AC-DC converter connected to a trademark power source, and an LED element substrate on which light-emitting diodes that emit light by a DC power source converted by the AC-DC converter are arranged. The light guide that diffuses the light from each light-emitting diode is charged when the trademark power supply is electrically connected, and is discharged toward the light-emitting diode when the electrical connection is broken LED light emitting marker device comprising: a battery power supply; a constant current supply means for supplying a constant current to the light emitting diode between the LED element substrate and the commercial power supply; and a control means for controlling an output current value of the constant current supply means. I will provide a.
実用新案登録第３１６７９２７号公報Utility Model Registration No. 3167927 特開２０１０－５６３１４号公報JP 2010-56314 A 特表２０１３－５４２５５０号公報Special table 2013-542550 gazette 特開２００７－２４２４９４号公報JP 2007-242494 A
　上述したように、従来のＬＥＤ発光装置は、特に特許文献１～３に記載されたＬＥＤ発光装置は、入力電圧の変動に伴って発光するダイオードの量を変化させて対応するようにしたものであり、引用文献４に記載されたＬＥＤ発光装置は、ＡＣ－ＤＣコンバータを用いて一定電圧（電流）で駆動するようにしたものである。 As described above, the conventional LED light-emitting devices, particularly the LED light-emitting devices described in Patent Documents 1 to 3, are made to respond by changing the amount of the diode that emits light according to the fluctuation of the input voltage. The LED light-emitting device described in the cited document 4 is driven at a constant voltage (current) using an AC-DC converter.
　しかしながら、ＡＣ－ＤＣコンバータを使用した場合、スイッチングノイズの発生があるため、高周波ノイズを避けなければならない病院や研究施設などでは使用できないという不具合が生じる。また、ＡＣ－ＤＣコンバータの変換効率による発熱、回路部品点数の増大（コストアップ）、変換効率によるロスがあるという不具合もある。 However, when an AC-DC converter is used, there is a problem that it cannot be used in hospitals and research facilities where high frequency noise must be avoided because of the occurrence of switching noise. In addition, there are problems such as heat generation due to the conversion efficiency of the AC-DC converter, increase in the number of circuit components (cost increase), and loss due to the conversion efficiency.
　また、従来は、定電流回路を用いた回路では電源電圧が高いと、定電流回路ロスが大きくなり、この分消費電流が増えるという不具合があり、また電源電圧が低いと定電流回路の設定電流まで届かず、ＬＥＤが暗くなるという不具合があった。さらに、定電流ＤＣコンバータを用いた回路では、電源電圧が高いとＤＣコンバータに流れる平均電流が減少し、電源電圧が低いと電流が増加してＬＥＤ側の消費電力を一定に保っていたが、この場合ＤＣコンバータを用いているためこのスイッチングのノイズが発生するという不具合が生じた。また、ＤＣコンバータの変換効率を９０％とすれば、１０％は熱ロスとなっていた。 Conventionally, in a circuit using a constant current circuit, if the power supply voltage is high, the constant current circuit loss increases, and there is a problem that the current consumption increases by this amount. If the power supply voltage is low, the set current of the constant current circuit is increased. There was a problem that the LED was dark. Furthermore, in a circuit using a constant current DC converter, when the power supply voltage is high, the average current flowing through the DC converter decreases, and when the power supply voltage is low, the current increases to keep the power consumption on the LED side constant. In this case, since a DC converter is used, a problem that this switching noise occurs occurs. Further, if the conversion efficiency of the DC converter was 90%, 10% was a heat loss.
　以上のことを鑑みて、本願発明は、ＡＣ－ＤＣコンバータを使用せず、アナログ回路のみで構成したＬＥＤ発光装置を提供することにある。 In view of the above, it is an object of the present invention to provide an LED light-emitting device that includes only an analog circuit without using an AC-DC converter.
　したがって、本願発明は、交流電源を整流する整流回路と、それぞれが、発光ダイオード及びその発光ダイオードに並列に接続され対応する発光ダイオードをオンオフするスイッチ手段によって構成されるとともに、前記整流回路の端子間に直列に接続される発光部と、直列に接続された複数の発光部の下流側に直列に接続された定電流回路と、前記定電流回路に並列に接続され、該定電流回路の最低電圧に設定された電圧保持手段とによって少なくとも構成されることにある。 Accordingly, the present invention comprises a rectifier circuit for rectifying an AC power supply, and a light emitting diode and switch means for turning on and off the corresponding light emitting diode connected in parallel to the light emitting diode, and between the terminals of the rectifier circuit. A light emitting unit connected in series, a constant current circuit connected in series downstream of a plurality of light emitting units connected in series, and a minimum voltage of the constant current circuit connected in parallel to the constant current circuit And at least a voltage holding means set in the above.
　これによって、整流回路の端子間に発生する電圧の変動によって、たとえば整流された交流波形の電圧の上昇に合わせて、前記発光部を順次発光させることができるので、電源電圧の力率を１にすることができるものである。 As a result, the light emitting unit can be caused to emit light sequentially in accordance with, for example, a rise in the voltage of the rectified AC waveform due to the fluctuation of the voltage generated between the terminals of the rectifier circuit. Is something that can be done.
　また、前記スイッチ手段は、電界効果トランジスタであることが望ましい。 The switch means is preferably a field effect transistor.
　さらに、前記電圧保持手段は、ツェナーダイオードであることが望ましい。 Furthermore, it is desirable that the voltage holding means is a Zener diode.
　さらにまた、前記複数の発光部の上流側に、発光ダイオードが直列に接続されて構成された発光ダイオード群が配置されることが望ましい。 Furthermore, it is preferable that a light emitting diode group configured by connecting light emitting diodes in series is disposed upstream of the plurality of light emitting units.
　本願発明によれば、入力電圧に応じて点灯するＬＥＤの数を制御することができるので、変動する電源の力率を１にすることができるものである。また、ＡＣ－ＤＣコンバータを使用しないので、上述したＡＣ－ＤＣコンバータに由来する問題点をすべて回避できるものである。 According to the present invention, the number of LEDs to be lit can be controlled according to the input voltage, so that the power factor of the varying power source can be set to 1. Further, since no AC-DC converter is used, all the problems derived from the AC-DC converter described above can be avoided.
本願発明の実施例１に係るＬＥＤ発光装置の回路図である。It is a circuit diagram of the LED light-emitting device which concerns on Example 1 of this invention. 本願発明の実施例２に係るＬＥＤ発光装置の回路図である。It is a circuit diagram of the LED light-emitting device which concerns on Example 2 of this invention. 本願発明の実施例３に係るＬＥＤ発光装置の回路図である。It is a circuit diagram of the LED light-emitting device which concerns on Example 3 of this invention. 本願発明の実施例１に係るＬＥＤ発光装置の動作を説明するためのグラフ図である。It is a graph for demonstrating operation | movement of the LED light-emitting device which concerns on Example 1 of this invention. 本願発明の実施例２に係るＬＥＤ発光装置の動作を説明するためのグラフ図である。It is a graph for demonstrating operation | movement of the LED light-emitting device which concerns on Example 2 of this invention.
　以下、本発明について図面により説明する。 Hereinafter, the present invention will be described with reference to the drawings.
　たとえば図１に示すような本願発明に実施例１に係るＬＥＤ発光装置１は、フューズＦ１を介してＡＣ電源２に接続された整流回路３を具備する。この整流回路３は、４つのダイオードＤ１～Ｄ４により構成されている。これによって、整流回路３の出力端子４，５間に生じる電圧Ｅｍは、交流が整流されて図４で示されるような波形となる。 For example, the LED light emitting device 1 according to the first embodiment of the present invention as shown in FIG. 1 includes a rectifier circuit 3 connected to an AC power source 2 via a fuse F1. The rectifier circuit 3 is composed of four diodes D1 to D4. As a result, the voltage Em generated between the output terminals 4 and 5 of the rectifier circuit 3 is rectified by the alternating current and has a waveform as shown in FIG.
　発光部６～４５は、それぞれ前記出力端子４から直列に接続される発光ダイオードＬＤ１～ＬＤ４０と、この発光ダイオードＬＤ１～ＬＤ４０のそれぞれに並列に接続され、発光ダイオードＬＤ１をオンオフする電界効果トランジスタ（ＦＥＴ）Ｑ１～Ｑ４０とによって構成される。前記発光部６の発光ダイオードのＬＤ１のアノード端子は出力端子４に接続され、発光ダイオードＬＤ１のカソード端子は、次の発光部７の発光ダイオードＬＤ２のアノード端子と接続され、順次発光ダイオードが直列に接続される。 The light emitting units 6 to 45 are light emitting diodes LD1 to LD40 connected in series from the output terminal 4, respectively, and field effect transistors (FETs) connected in parallel to the light emitting diodes LD1 to LD40 to turn on and off the light emitting diode LD1. ) Q1 to Q40. The anode terminal of the light emitting diode LD1 of the light emitting unit 6 is connected to the output terminal 4, the cathode terminal of the light emitting diode LD1 is connected to the anode terminal of the light emitting diode LD2 of the next light emitting unit 7, and the light emitting diodes are sequentially connected in series. Connected.
　発光部６～４５のＦＥＴＱ１～Ｑ４０は、発光部６～４５の発光ダイオードＬＤ１～ＬＤ４０のそれぞれに並列に接続される。また、それぞれのＦＥＴＱ１～Ｑ４０のゲート－ソース間には、電圧維持抵抗Ｒ２～Ｒ４１が設けられ、さらにゲート端子には、抵抗Ｒ１とツェナーダイオードＤ４５によって設定された最低電圧（たとえば４Ｖ）が印加される。また、ＦＥＴＱ１～Ｑ４０のゲート端子には、ダイオードＤ５～Ｄ４５が、ＦＥＴＱ１～Ｑ４０のゲート－ドレイン間の耐圧を超えないように設けられる。ただし、Ｒ２～Ｒ４１によってゲート－ドレイン間は同電位にクランプされている。 The FETs Q1 to Q40 of the light emitting units 6 to 45 are connected in parallel to the light emitting diodes LD1 to LD40 of the light emitting units 6 to 45, respectively. Further, voltage maintaining resistors R2 to R41 are provided between the gates and the sources of the FETs Q1 to Q40, respectively, and a minimum voltage (for example, 4 V) set by the resistor R1 and the Zener diode D45 is applied to the gate terminal. The Also, diodes D5 to D45 are provided at the gate terminals of the FETs Q1 to Q40 so as not to exceed the gate-drain breakdown voltage of the FETs Q1 to Q40. However, the gate and drain are clamped at the same potential by R2 to R41.
　この実施例１において、定電流回路５０は、電界効果トランジスタＱ４１、トランジスタＱ４２、抵抗Ｒ４２及びＲ４３によって構成され、前記発光部６～４４の下流側に接続される。 In the first embodiment, the constant current circuit 50 includes a field effect transistor Q41, a transistor Q42, and resistors R42 and R43, and is connected to the downstream side of the light emitting units 6 to 44.
　以上の構成のＬＥＤ発光装置１において、図４で示すように、整流回路３の出力端子４，５間の電圧Ｅｍは、商用電源ＡＣ１００Ｖの場合は０Ｖ～１４１Ｖまでの間で変化する。電圧Ｅｍが、抵抗Ｒ１とツェナーダイオードＤ４５とによって定電流回路５０の最低電圧に設定された電圧Ｖｄ（たとえば４Ｖ）＋発光ダイオードの駆動電圧Ｖｆ（たとえば３Ｖ）以下であれば、発光ダイオードＬＤ１～ＬＤ４０は発光しない。 In the LED light emitting device 1 having the above configuration, as shown in FIG. 4, the voltage Em between the output terminals 4 and 5 of the rectifier circuit 3 varies between 0V and 141V in the case of commercial power supply AC100V. If the voltage Em is equal to or lower than the voltage Vd (for example, 4V) set to the lowest voltage of the constant current circuit 50 by the resistor R1 and the Zener diode D45 + the driving voltage Vf (for example, 3V) of the light emitting diode, the light emitting diodes LD1 to LD40. Does not emit light.
　次に、電圧Ｅｍが、たとえば１０Ｖに上昇した場合、発光ダイオードＬＤ１のアノード電圧が１０Ｖとなりカソード電圧が７Ｖとなり、電圧ＶｄよりもＦＥＴＱ１のゲートは高電位となるため、ＦＥＴＱ１がＯＦＦとなり発光ダイオードＬＤ１が点灯する。発光ダイオードＬＤ２のアノード電圧は７Ｖとなり、カソード電圧は４Ｖとなり、ＦＥＴＱ２のソース電圧も４Ｖとなる。これにより、ＦＥＴＱ２のゲート電圧が定電流回路５０の電圧Ｖｄと同一となるため、ＦＥＴＱ２はＯＦＦして発光ダイオードＬＤ２は点灯する。次に、発光ダイオードＬＤ３のアノード電圧４Ｖであるため、電流が流れると発光ダイオードＬＤ３のカソード電圧は１Ｖとなる。この場合、電圧Ｖｄがこのカソード電圧よりも３Ｖ高いため、ＦＥＴＱ３がＯＮするので、発光ダイオードＬＤ３は消灯する。この動作が、発光部４～４０に順に生じるため、発光ダイオードＬＤ４～４０は順次消灯する。 Next, when the voltage Em rises to, for example, 10V, the anode voltage of the light emitting diode LD1 becomes 10V and the cathode voltage becomes 7V, and the gate of the FET Q1 becomes higher than the voltage Vd, so the FET Q1 is turned OFF and the light emitting diode LD1. Lights up. The anode voltage of the light emitting diode LD2 is 7V, the cathode voltage is 4V, and the source voltage of the FET Q2 is 4V. As a result, the gate voltage of the FET Q2 becomes equal to the voltage Vd of the constant current circuit 50, so that the FET Q2 is turned off and the light emitting diode LD2 is lit. Next, since the anode voltage of the light emitting diode LD3 is 4V, the cathode voltage of the light emitting diode LD3 becomes 1V when a current flows. In this case, since the voltage Vd is 3V higher than the cathode voltage, the FET Q3 is turned on, so that the light emitting diode LD3 is turned off. Since this operation occurs sequentially in the light emitting units 4 to 40, the light emitting diodes LD4 to LD40 are sequentially turned off.
　このように、入力電圧Ｅｍが上昇するについて、順次発光ダイオードが発光していくことにある。また、入力電圧Ｅｍが下降する場合には、順次発光ダイオードが消灯していくことなる。この点灯と消灯が、１秒当たり、５０サイクル交流では１００回、６０サイクル交流では１２０回繰り返されることになるので、全体として十分な照度を維持できるものである。さらに、電圧の変動に対応して発光ダイオードが自動的に選択されて発光することになるので、電源の力率を１にすることができるものである。 Thus, as the input voltage Em rises, the light emitting diodes sequentially emit light. Further, when the input voltage Em decreases, the light emitting diodes are sequentially turned off. This lighting and extinction is repeated 100 times per second for 50 cycle alternating current and 120 times for 60 cycle alternating current, so that sufficient illuminance can be maintained as a whole. Furthermore, since the light emitting diode is automatically selected in accordance with the voltage fluctuation and emits light, the power factor of the power source can be set to 1.
　本願発明の実施例２に係るＬＥＤ発光装置１Ａは、図２に示すように、整流回路３の出力端子４，５間に充電用のコンデンサＣ２を具備すること、所定数の発光ダイオードＬＤ４１～ＬＤ７０が直列に接続された発光ダイオード群６０を具備することを特徴とする。これにより、入力電圧Ｅｍが０Ｖまで降下してもコンデンサＣ２により充電された電圧ＶＡにより、発光ダイオード群６０は常時点灯するものである。また、前記発光ダイオード群６０の下流側には、発光部６１～７４が直列に接続され、さらにその下流側には定電流回路５０Ａが接続される。尚、発光部６１～７４は、発光ダイオードＬＤ７１～ＬＤ８２、ＦＥＴＧ４３～Ｑ５４、抵抗Ｒ４５～Ｒ５６及びダイオードＤ５０～Ｄ６１によってそれぞれ構成されている。 As shown in FIG. 2, the LED light emitting device 1A according to the second embodiment of the present invention includes a charging capacitor C2 between the output terminals 4 and 5 of the rectifier circuit 3, and a predetermined number of light emitting diodes LD41 to LD70. Are provided with a group of light emitting diodes 60 connected in series. Thereby, even if the input voltage Em falls to 0V, the light emitting diode group 60 is always lit by the voltage VA charged by the capacitor C2. Further, light emitting units 61 to 74 are connected in series on the downstream side of the light emitting diode group 60, and a constant current circuit 50A is further connected on the downstream side thereof. The light emitting units 61 to 74 are configured by light emitting diodes LD71 to LD82, FETs G43 to Q54, resistors R45 to R56, and diodes D50 to D61, respectively.
　また、図５に示すようなコンデンサＣ２のリップル成分ＶＢが、実施例１で説明された動作により発光部６１～７４によって制御される。この場合の力率は０．６～０．７程度である。 Further, the ripple component VB of the capacitor C2 as shown in FIG. 5 is controlled by the light emitting units 61 to 74 by the operation described in the first embodiment. In this case, the power factor is about 0.6 to 0.7.
　このように、実施例２に係るＬＥＤ発光装置１Ａでは、コンデンサＣ２によって生じる電圧ＶＡによって発光ダイオード群６０が常時点灯し、このコンデンサＣ２によるリップル電圧ＶＢは発光ダイオード群６０に直列に接続された発光部６１～７４によって制御されるものである。言い換えると、この発光部６１～７４は、リップル電圧ＶＢの上下に追随して順次発光し順次消灯する。これによって実施例２に係るＬＥＤ発光装置１Ａも、実施例１のＬＥＤ発光装置１と同様の効果を奏することができるものである。 Thus, in the LED light emitting device 1A according to the second embodiment, the light emitting diode group 60 is always lit by the voltage VA generated by the capacitor C2, and the ripple voltage VB generated by the capacitor C2 is emitted in series with the light emitting diode group 60. It is controlled by the units 61 to 74. In other words, the light emitting units 61 to 74 emit light sequentially following the top and bottom of the ripple voltage VB and sequentially turn off. As a result, the LED light emitting device 1A according to the second embodiment can achieve the same effects as the LED light emitting device 1 of the first embodiment.
　本願発明の実施例３に係るＬＥＤ発光装置１Ｂは、実施例２に係るＬＥＤ発光装置１Ａと同様に、充電用のコンデンサＣ３と、直列に接続された発光ダイオードＬＤ８３～ＬＤ１１７からなる発光ダイオード群８０と、発光ダイオード群８０の下流側に直列に接続された発光部８１～８８と、発光部８１～８８の下流側に接続された定電流回路５０Ｂとによって構成される。 The LED light emitting device 1B according to the third embodiment of the present invention is similar to the LED light emitting device 1A according to the second embodiment in that the light emitting diode group 80 includes the charging capacitor C3 and the light emitting diodes LD83 to LD117 connected in series. And light emitting units 81 to 88 connected in series to the downstream side of the light emitting diode group 80, and a constant current circuit 50B connected to the downstream side of the light emitting units 81 to 88.
　この実施例３に係るＬＥＤ発光装置１Ｂの特徴は、実施例３に係る発光部８１～８８が、実施例１及び実施例２の発光部のからゲート－ソース間の抵抗及びダイオードを省略したものである。これは、前記リップル電圧ＶＢの変動に対して直列に接続されたＦＥＴＱ６１～Ｑ６８のゲート－ソース間の電圧ＶＧ－Ｓの耐圧内で制御するようにしたものである。これによって発光部８１～８８の部品点数を減少させるという効果を有するものである。 The LED light emitting device 1B according to the third embodiment is characterized in that the light emitting units 81 to 88 according to the third embodiment omit the gate-source resistance and the diode from the light emitting units of the first and second embodiments. It is. This is the gate of the ripple voltage FETQ61 ~ Q68 connected in series to the variation of VB - is obtained so as to control the breakdown voltage of the voltage V G-S between the source. This has the effect of reducing the number of parts of the light emitting portions 81 to 88.
　以上説明したように、本願発明は、電圧の変化によって発光ダイオードの発光を制御できるという構造を有することから、電圧制御のプログラムを組むことによって、複数の発光ダイオードの発光を制御することができるため、電圧を供給する一対の配線のみによって広告灯や、表示灯などを制御することができる。また、このプログラムは簡単に構成できるためにＣＰＵへの負担が低いという効果を奏する。 As described above, the present invention has a structure in which the light emission of the light emitting diode can be controlled by a change in voltage, so that the light emission of a plurality of light emitting diodes can be controlled by creating a voltage control program. It is possible to control advertising lights, indicator lights, etc. only by a pair of wires for supplying voltage. In addition, since this program can be easily configured, the burden on the CPU is low.
　１，１Ａ，１Ｂ　ＬＥＤ発光装置
　２　交流電源
　３　整流回路
　４，５　出力端子
　６～４５，６１～７４，８１～８８　発光部
　５０，５０Ａ，５０Ｂ　定電流回路 1, 1A, 1B LED light emitting device 2 AC power supply 3 Rectifier circuit 4, 5 Output terminal 6 to 45, 61 to 74, 81 to 88 Light emitting unit 50, 50A, 50B Constant current circuit

Claims (4)

  1. 　電圧が変動する電源と、
    　それぞれが、発光ダイオード及びその発光ダイオードに並列に接続され対応する発光ダイオードをオンオフするスイッチ手段によって構成されるとともに、前記整流回路の端子間に直列に接続される発光部と、
    　直列に接続された複数の発光部の下流側に直列に接続された定電流回路と、
    　前記定電流回路に並列に接続され、該定電流回路の最低電圧に設定された電圧保持手段とによって少なくとも構成されることを特徴とするＬＥＤ発光装置     A power supply whose voltage fluctuates;
    Each is constituted by a light emitting diode and switch means connected in parallel to the light emitting diode to turn on and off the corresponding light emitting diode, and a light emitting section connected in series between the terminals of the rectifier circuit;
    A constant current circuit connected in series downstream of a plurality of light emitting units connected in series;
    An LED light emitting device comprising at least voltage holding means connected in parallel to the constant current circuit and set to a minimum voltage of the constant current circuit
  2. 　前記スイッチ手段は、電界効果トランジスタであることを特徴とする請求項１記載のＬＥＤ発光装置。 2. The LED light emitting device according to claim 1, wherein the switch means is a field effect transistor.
  3. 　前記電圧保持手段は、ツェナーダイオードであることを特徴とする請求項１又は２記載のＬＥＤ発光装置。 3. The LED light emitting device according to claim 1 or 2, wherein the voltage holding means is a Zener diode.
  4. 　前記複数の発光部の上流側に、発光ダイオードが直列に接続されて構成された発光ダイオード群が配置されることを特徴とする請求項１～３のいずれか１つに記載のＬＥＤ発光装置。 The LED light-emitting device according to any one of claims 1 to 3, wherein a light-emitting diode group configured by connecting light-emitting diodes in series is disposed upstream of the plurality of light-emitting units.
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JP2013179279A (en) * 2012-02-08 2013-09-09 Ntt Data Intellilink Corp Potential barrier element control circuit and potential barrier element circuit

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007073665A (en) * 2005-09-06 2007-03-22 Eteitsuku:Kk Drive circuit
JP2012114236A (en) * 2010-11-24 2012-06-14 Nichia Chem Ind Ltd Light-emitting diode driving device
JP2013179279A (en) * 2012-02-08 2013-09-09 Ntt Data Intellilink Corp Potential barrier element control circuit and potential barrier element circuit

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