JP2008300152A - Light-emitting diode automatic dimming device - Google Patents

Light-emitting diode automatic dimming device Download PDF

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JP2008300152A
JP2008300152A JP2007144173A JP2007144173A JP2008300152A JP 2008300152 A JP2008300152 A JP 2008300152A JP 2007144173 A JP2007144173 A JP 2007144173A JP 2007144173 A JP2007144173 A JP 2007144173A JP 2008300152 A JP2008300152 A JP 2008300152A
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light
signal
led
emitting diode
brightness
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Shinichiro Haruyama
真一郎 春山
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Nakagawa Kenkyusho:Kk
株式会社中川研究所
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for controlling light emission from a light-emitting diode in a simple circuit structure on the basis of brightness of the surroundings. <P>SOLUTION: One or a plurality of visible-light light-emitting diodes 120 are functioned as a lighting tool, and the current for driving the light-emitting diodes is supplied from a driver amplifier 136 for illumination of the light-emitting diode. The current flowed in the driver amplifier 136 for illumination of the light-emitting diode is controlled by a dimming control signal L transmitted from a dimming circuit 110, and adjustment for brightness of the light-emitting diode is carried out by performing pulse width modulation (PWM) to the dimming control signal L. The light-emitting diode is used as a light-receiving sensor at the period when the current flowing in the light-emitting diode becomes zero since a period when current flowing in the light-emitting diode exists and a period when the current flowing in the light-emitting diode does not exist alternately exist in the pulse width modulation. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、LEDを用いた照明装置で、設定した明るさに自動的に調光するLED自動調光装置に関するものである。 The present invention is a lighting apparatus using the LED, it relates to automatic LED dimming apparatus for automatically dimming the brightness to the level set.

照明の光を制御する時に、ユーザの指定する明るさに調光を行う装置は実用化しているが、周辺からの明るさ(例えば窓から入る太陽光)をもとにして部屋の中の明るさを所望の明るさにする制御は行われていない。 When controlling the light of the illumination, but the device that performs the brightness dimming designated by the user are commercialized, the brightness of the surrounding (e.g. sunlight entering through a window) and based on the brightness in the room control is not performed to the desired brightness of the of. 例えば、白熱灯の調光は、白熱灯と直列に接続したサイリスタの導通角を制御し、平均電流を変化させて調光する例が多い。 For example, the dimming of an incandescent lamp, and controls the conduction angle of the thyristors connected to the incandescent lamp in series, an example of dimming by changing the average current is large. これも連続的に白熱灯を調光することはできても、周辺の明るさを考慮していない。 This is also even be able to continuously incandescent lamp dimming, does not take into account the brightness of the surroundings.
さて、近年、LEDなどの半導体発光素子が照明用の光源に利用されるようになってきた。 Now, in recent years, semiconductor light emitting element such as an LED has come to be used as a light source for illumination. 半導体発光素子は、高速に点滅あるいは光量の制御が可能である。 The semiconductor light emitting device, it is possible to control the flashing or light intensity at a high speed. このLEDを用いた照明装置においても、簡単な回路構成で周囲の明るさを考慮した自動調光については提案されていない。 Also in the illumination apparatus using the LED, it has not been proposed yet automatic light in consideration of the ambient brightness with a simple circuit configuration.
なお、発光素子であるLEDを、受光素子とし使用したものとして、以下の2つの非特許文献がある。 Incidentally, the LED is a light emitting element, as the one used as a light receiving element, there are two non-patent literature.

本発明は、上述した事情に鑑みてなされたもので、簡単な回路構成で、周囲の明るさにより、LEDからの発光を制御する装置を提供することを目的とするものである。 The present invention has been made in view of the above circumstances, a simple circuit arrangement, the brightness of the surroundings, it is an object to provide an apparatus for controlling the light emission from the LED.

上記目的を達成するために、本発明は、可視光を発光するLEDと、該LEDの発光する明るさを設定する明るさ設定回路と、該LEDを発光させる信号を発生する発光駆動回路と、前記LEDを発光モードと受光モードとに切り替える信号を発生する切り替え信号発生回路と、前記切り替え信号により、前記LEDを受光モードとしたときの受光信号と、前記明るさ設定回路からの設定信号との差信号を発生する差信号発生回路と、該差信号発生回路からの差信号により、前記発光駆動回路を制御することを特徴とするLED自動調光装置である。 To achieve the above object, the present invention includes an LED that emits visible light, and the brightness setting circuit for setting the brightness of light emission of the LED, the light emission drive circuit for generating a signal for emitting the LED, a switching signal generating circuit for generating a signal for switching the LED into the light-emitting mode and a light-receiving mode, by the switching signal, and the photodetection signal when the LED was received mode, the setting signal from the brightness setting circuit and a difference signal generating circuit for generating a difference signal, the difference signal from the differential signal generating circuit, an LED automatic light control device and controls the light emission driving circuit.
前記発光駆動回路は、LEDを発光させる信号として、受光信号と設定信号との差信号により、パスル幅を制御した信号を発生することもできる。 The light emission drive circuit as a signal for emitting the LED, the difference signal between the light receiving signal and the setting signal, it is also possible to generate a signal to control the Pasuru width.

本発明は、周辺からの明るさ(例えば窓から入る太陽光)を補う形で部屋の中の明るさを所望の明るさにするので、無駄な照明を行わず、エネルギー消費の節約に役立つ。 The present invention, since the brightness of the surrounding (e.g. sunlight entering through a window) the brightness of the room in a manner to compensate for a desired brightness, without unnecessary lighting, help save energy.
しかも、周辺からの明るさを測定する光センサとして照明光源であるLED自身を用いるので、光センサデバイスを用いずに、簡単な構造で周辺からの明るさに応じた調光を行うことが可能である。 Moreover, since an LED itself is an illumination light source as a light sensor for measuring the brightness of the surroundings, without using the optical sensor device, capable of performing light control corresponding to the brightness of the peripheral by a simple structure it is.

本発明では、周辺からの明るさ(例えば窓から入る太陽光)をもとにして部屋の中の明るさを所望の明るさにする制御をおこない、しかも、この周辺からの明るさを測定する装置として、発光素子がLEDの場合、そのLED自身をセンサとして用いて周辺からの明るさを測定し、その測定データをもとに調光量を制御する。 In the present invention, the brightness of the surrounding (e.g. sunlight entering through a window) and based on the brightness of the room and controls to desired brightness, moreover, to measure the brightness from the surrounding as a device, the light emitting element is the case of LED, measuring the brightness of the peripheral by using the LED itself as a sensor, to control based on the amount of dimming of the measurement data.

本発明の実施形態における自動調光装置100の構成図を図1に示す。 A block diagram of an automatic light control device 100 according to an embodiment of the present invention shown in FIG. 図1において、単数あるいは複数の可視光LED120が照明器具として機能し、それを駆動する電流はLED照明用ドライバーアンプ136から供給される。 In Figure 1, single or multiple visible light LED120 functions as lighting fixture, the current for driving the is supplied from the LED lighting driver amplifier 136. このLED照明用ドライバーアンプ136にながれる電流は、調光回路110からの調光制御信号Lにより制御し、LEDの明るさの調節は、調光制御信号Lにパルス幅変調(Pulse Width Modulation:PWM)をおこなうことにより行う。 Current flowing to the LED lighting driver amplifier 136, controlled by the dimming control signal L from the light control circuit 110, adjustment of the brightness of the LED, the pulse width modulation dimming control signal L (Pulse Width Modulation: PWM ) carried out by performing. パルス幅変調では、LEDに流す電流がある期間とLEDに流す電流がゼロになる期間が交互にあるので、LEDに流す電流がゼロになる期間にLEDを受光センサとして用いる。 In pulse width modulation, since the period in which the current becomes zero flow on periods and LED on the current flowing to the LED is alternately the current flowing through the LED is an LED in a period of zero as a light receiving sensor.

図2,図3は、図1の調光回路110からの切り替え信号S,調光制御信号L,LEDを受光センサとして用いたときの受光信号P,ユーザが設定する明るさの値を示す信号Uの関係を示す波形図である。 2, FIG. 3, a signal indicating the brightness value of the light receiving signal P, the user sets in the case of using the switching signal S from the light control circuit 110 of FIG. 1, the dimming control signal L, and LED as a light receiving sensor is a waveform diagram showing the relationship between the U. 図2は周辺からの光が暗いとき、図3は周辺からの光が明るいときの信号を示している。 When 2 dark light from the peripheral, Fig. 3 shows a signal when the light is bright from a peripheral.
図2,図3のグラフにおいて、切り替え制御信号Sをオフ(値0)にすることによりLED照明用ドライバーアンプの出力信号をカットオフし、LEDにあたる光の量に応じた微小な電流を受光信号増幅用アンプで増幅して受光信号Pとして観測することができる。 2, in the graph of FIG. 3, cut off the output signal of the driver amplifier for LED lighting by turning off (value 0) a switching control signal S, the light receiving signal a minute current corresponding to the amount of light striking LED amplified by the amplification amplifier can be observed as a light receiving signal P.
なお、図2,図3において、切り替え制御信号Sがオン(値1)のときは、LEDに大きな電流を流してLEDを発光している状態なので、そのときの発光信号Pの値は調光回路110では無視しており、図示している信号の値は無意味なものである。 Incidentally, FIG. 2, 3, when the switching control signal S is on (value 1), since a state in which by supplying a large current to the LED is emitting LED, the light emission signal value of P dimming at that time and ignoring the circuit 110, the value of a signal shown is meaningless.
このように、切り替え制御信号Sは、LEDを発光モードと受光モードに切り替えている。 Thus, the switching control signal S is switched to LED to light emission mode and light mode.

切り替え制御信号Sをオフにすることにより、LED照明用ドライバーアンプの出力信号をカットオフし、LEDにあたる光の量に応じた微小な電流を受光信号増幅用アンプで増幅して受光信号Pとして観測することができる。 By turning off the switching control signal S, the output signal of the driver amplifier for LED lighting cut off, observed as a light reception signal P a minute current corresponding to the amount of light striking LED is amplified by the light receiving signal amplifying amplifier can do. このときは、LEDからの光が消灯されているので、観測される光は、この照明器具以外の光源の光であり、例えば、昼間の場合は窓から入射してくる屋外からの光であり、夜間の場合は他の照明器具からの光である。 In this case, since the light from the LED is turned off, the light observed is a light source other than the luminaire, for example, in the case of daytime it is light from outside coming incident from the window in the case of nighttime light from other lighting fixture.
この調光装置110により、受光信号Pとユーザが設定する明るさの値Uをもとに、調光信号Lのパルス幅を変化させて、ユーザの所望する明るさで照明を光らせることが可能となる。 The dimmer 110, can illuminate based on the brightness value U that received signal P and the user sets, by changing the pulse width of the dimming signal L, and the illumination at a desired brightness of the user to become.

図2は周辺からの光が暗い時であるが、ユーザが設定する明るさの値Uよりも暗いので、この照明器具を使って周辺からの光を補うように光らせ、合計の明るさをユーザの所望する明るさにする。 Although Figure 2 is when the dark light from the peripheral, so darker than the brightness value U set by the user, lighted so as to compensate for the light from the periphery with the luminaire, user brightness total to the desired brightness. 切り替え制御信号を0と1の値を繰り返すようにし、切り替え制御信号が1の期間内にLEDを発光し、切り替え制御信号が0の期間内にLEDを受光センサとして使う。 The switching control signal so as to repeat the values ​​0 and 1, the switching control signal to emit LED within a period of 1, uses an LED as a light receiving sensor to the switching control signal is in a period of 0. LEDを受光センサとして用いたときの信号を受光信号増幅用アンプ132で増幅した受光信号Pが、ユーザが設定する明るさの値Uよりも小さい場合、U−Pという値に比例した明るさにする必要があるので、調光制御信号Lのパルス幅をU−Pという値に比例した長さにする。 Receiving signal P signals when using the LED as the light receiving sensor and amplified by the light receiving signal amplifying amplifier 132, if the user is smaller than the brightness value U to be set, the brightness is proportional to the value of U-P it is necessary to, the pulse width of the dimming control signal L to the length proportional to the value of U-P. 図2の場合は周辺からの光が暗い時(つまりPが小さな値)なので、U−Pは大きな値となり、その結果調光制御信号Lのパルス幅は長くなる。 When the dark light from the periphery in the case of FIG. 2 since (ie P is a small value), U-P becomes a large value, the pulse width of the resulting light control signal L becomes longer.

図3は周辺からの光が明るい時であるが、この場合でも、受光の値Pはユーザが設定する明るさの値Uよりも暗いので、この照明器具を使って周辺からの光を補うように光らせ、合計の明るさをユーザの所望する明るさにするために、調光制御信号Lのパルス幅をUPという値に比例した長さにする。 Although Figure 3 is when the bright light from the surrounding, even in this case, since the value P of the light reception is darker than the value U brightness set by the user, so as to compensate for the light from the periphery with the luminaire the shining, to the desired brightness of the user brightness total, the pulse width of the dimming control signal L to the length proportional to the value UP. 図3の場合は周辺からの光が明るい時(つまりPが大きな値)なので、U−Pは小さな値となり、その結果調光制御信号Lのパルス幅は図2と比較すると短くなる。 When a bright light from the peripheral in the case of FIG. 3 so (ie P is a large value), U-P becomes a small value, it becomes shorter when the pulse width of the result dimming control signal L is compared with FIG.
また、U−Pが負の値をとることもありうるが、その場合は、周辺からの光だけで、すでにユーザが所望する明るさよりも明るいので、それをこの照明器具を使って暗くすることは不可能なので、調光制御信号Lのパルス幅はゼロとなり、完全に消灯状態にする。 Further, it U-P is but may also take a negative value, in which case, only the light from the periphery, already since brighter than the brightness desired by the user, to dim with this luminaire it since it is impossible, the pulse width of the dimming control signal L becomes zero, to completely unlit.
なお、上述では、切り替え信号と調光制御信号のパスル信号とが同期している実施形態を示した。 In the above description, it illustrates an embodiment in which the Pasuru signal switching signal and the dimming control signal are synchronized. この場合は、パルス幅変調では、LEDに流す電流がある期間とLEDに流す電流がゼロになる期間が交互にあるので、電流がゼロとなる期間を受光モードとしている。 In this case, a pulse width modulation, since the period in which the current becomes zero flow on periods and LED on the current flowing to the LED is alternately, and the period during which the current is zero and the light receiving mode. しかしながら、切り替え信号と調光制御信号のパスル信号とは、必ずしも同期している必要はない。 However, the Pasuru signal switching signal and the dimming control signal, do not have to be synchronized.

図4は、図1の調光回路110の実施例である。 Figure 4 is an embodiment of the dimmer circuit 110 of FIG. 図4において、ユーザの明るさの設定は、可変抵抗138と抵抗137との直列回路の可変抵抗値をユーザが変化させ、調光回路110へ入力している電圧Uを変化させることで設定している。 4, setting the brightness of the user, and set by changing the voltage U are entering a variable resistance value of the series circuit of a variable resistor 138 and the resistor 137 the user alters, the dimmer circuit 110 ing. LEDからの受光信号Pは、切り替え信号Sでトリガパルスを発生するトリガパルス発生回路114からのトリガパルスtを用いて、サンプルホールド回路113でサンプルホールドして信号P'を発生する。 Receiving signals P from the LED, by using a trigger pulse t from the trigger pulse generating circuit 114 for generating a trigger pulse in the switching signal S, is sampled and held by the sample-and-hold circuit 113 generates a signal P '. この信号P'は、ユーザの設定値である電圧Uとともに、比較回路112に入力される。 This signal P ', along with the voltage U is the user of the set value, is inputted to the comparison circuit 112.

受光信号Pのサンプルホールドのタイミングを決めるトリガパルスtは、切り替え制御信号発生回路115から発生する切り替え制御信号Sがオフのとき、即ち、LED120(図1参照)が消灯しているときに、受光信号Pをサンプルホールド回路113でホールド(保持)するための信号である。 Trigger pulse t that determines the timing of the sample hold of the received light signal P, when the switching control signal S generated from the switching control signal generating circuit 115 is turned off, i.e., when the LEDs 120 (see FIG. 1) is off, the light-receiving the signal P by the sample-and-hold circuit 113 is a signal for holding (retention).
比較回路112からの電圧Uと受光信号Pのサンプルホールド信号P'との差の信号(U−P')を調光制御信号発生回路116へ入力し、その差信号にパルス幅が比例する調光制御信号(PWM信号)Lを発生する。 A voltage U from the comparison circuit 112 inputs the received signal P of the sample-and-hold signal 'difference signal between the (U-P' P) a dimming control signal generating circuit 116, tone pulse width is proportional to the difference signal optical control signal to generate a (PWM signal) L.
このようにして、受光信号Pをサンプルホールドして、ユーザが設定する値Uとの差の信号を発生することにより、調光制御信号Lを発生することができる。 In this way, the light reception signal P by the sample and hold, by generating a signal of a difference between the value U set by the user, it is possible to generate a dimming control signal L.

本発明のLED発光制御装置の構成の概略を示す図である。 It is a diagram showing a schematic configuration of the LED light emission control device of the present invention. 周囲が暗いときの信号のタイムチャートを示す図である。 Periphery is a diagram showing a time chart of signals when dark. 周囲が明るいときの信号のタイムチャートを示す図である。 Periphery is a diagram showing a time chart of signals when bright. 調光回路の実施例を示す図である。 It illustrates an embodiment of the dimmer circuit.

符号の説明 DESCRIPTION OF SYMBOLS

100 自動調光装置110 調光回路112 比較回路113 サンプルホールド回路114 トリガパルス発生回路115 切り替え制御信号発生回路116 調光制御信号発生回路132 受光信号増幅用アンプ136 LED照明用ドライバーアンプ137 抵抗138 可変抵抗 100 automatic dimmer 110 dimming circuit 112 comparator circuit 113 sample-and-hold circuit 114 trigger pulse generating circuit 115 the switching control signal generating circuit 116 dimming control signal generating circuit 132 receiving signal amplifying amplifier 136 LED lighting driver amplifier 137 resistor 138 variable resistance

Claims (2)

  1. 可視光を発光するLEDと、 An LED that emits visible light,
    該LEDの発光する明るさを設定する明るさ設定回路と、 A brightness setting circuit for setting the brightness of light emission of the LED,
    該LEDを発光させる信号を発生する発光駆動回路と、 A light emission driving circuit for generating a signal for emitting the LED,
    前記LEDを発光モードと受光モードとに切り替える信号を発生する切り替え信号発生回路と、 A switching signal generating circuit for generating a signal for switching the LED into the light-emitting mode and a light-receiving mode,
    前記切り替え信号により、前記LEDを受光モードとしたときの受光信号と、前記明るさ設定回路からの設定信号との差信号を発生する差信号発生回路と、 By the switching signal, and the photodetection signal when the LED was received mode, and a difference signal generating circuit for generating a difference signal between the set signal from the brightness setting circuit,
    該差信号発生回路からの差信号により、前記発光駆動回路を制御することを特徴とするLED自動調光装置。 The difference signal from the differential signal generating circuit, LED automatic light control device and controls the light emission driving circuit.
  2. 請求項1に記載するLED自動調光装置において、 In automatic LED dimming apparatus according to claim 1,
    前記発光駆動回路は、LEDを発光させる信号として、受光信号と設定信号との差信号により、パスル幅を制御した信号を発生することを特徴とするLED自動調光装置。 The light emission drive circuit as a signal for emitting the LED, the difference signal between the light receiving signal and the setting signal, LED automatic light apparatus characterized by generating a signal having a controlled Pasuru width.
JP2007144173A 2007-05-30 2007-05-30 Light-emitting diode automatic dimming device Pending JP2008300152A (en)

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US10210750B2 (en) 2011-09-13 2019-02-19 Lutron Electronics Co., Inc. System and method of extending the communication range in a visible light communication system
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