JP2007005258A - Lighting system - Google Patents

Lighting system Download PDF

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JP2007005258A
JP2007005258A JP2005187258A JP2005187258A JP2007005258A JP 2007005258 A JP2007005258 A JP 2007005258A JP 2005187258 A JP2005187258 A JP 2005187258A JP 2005187258 A JP2005187258 A JP 2005187258A JP 2007005258 A JP2007005258 A JP 2007005258A
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dimming
signal
voltage
light emitting
state light
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Minoru Maehara
稔 前原
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Panasonic Electric Works Co Ltd
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Matsushita Electric Works Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

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  • Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)
  • Electroluminescent Light Sources (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lighting system using such a solid light-emitting element that a unified light modulation is feasible by using a light modulation signal used for a fluorescent lamp luminaire even when the lighting system is used concurrently with the fluorescent lamp luminaire. <P>SOLUTION: A light modulation signal that is used for light modulation in a fluorescent lamp luminaire and that has an on-duty ratio inversely proportional to a light modulation ratio of a light source is inverted by an inverter circuit 3a provided in a light modulation means 3, and the signal thus inverted is used for a switching operation of a switching element 3b to thereby allow the solid light-emitting element 1 to emit light. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、固体発光素子を光源とする照明装置に関する。   The present invention relates to a lighting device using a solid light emitting element as a light source.

近年、薄型の固体発光素子として有機ＥＬ素子の研究が盛んである。有機ＥＬ素子は、有機化合物から成る薄膜の発光層を電極で挟持した構成で、電極間に電流を供給すると発光する素子である。有機ＥＬ素子は薄型かつ軽量の発光素子が構成でき、また駆動電圧が数Ｖから十数Ｖ程度と従来主流の光源である放電灯と比べて駆動電圧が低いため、点灯装置を安価に構成でき、薄型かつ軽量の照明器具への応用が期待できる。   In recent years, organic EL devices have been actively studied as thin solid-state light emitting devices. An organic EL device is a device in which a thin light emitting layer made of an organic compound is sandwiched between electrodes and emits light when a current is supplied between the electrodes. The organic EL element can be configured as a thin and lightweight light-emitting element, and the driving voltage is about several to several tens of volts, which is lower than that of a discharge lamp that is a conventional mainstream light source. Application to thin and lightweight lighting fixtures can be expected.

ところで、照明装置を利用するにあたり、省電力や照明の演出性といった観点から照明装置の調光が一般に行われており、従来の有機ＥＬ素子を用いた照明装置として、特許文献１に記載されたものがある。   By the way, in using an illuminating device, dimming of the illuminating device is generally performed from the viewpoint of power saving and lighting performance, and is described in Patent Document 1 as an illuminating device using a conventional organic EL element. There is something.

この従来例は、図４に示すように、交流電源ＰＳから供給される交流電力を直流電力に変換するコンバータ手段２０と、コンバータ手段２０から供給される直流電流をオン／オフして有機ＥＬ素子１０に順方向の電流を間欠的に供給するスイッチング手段３０と、交流入力電源ＰＳよりも高いスイッチング周波数でスイッチング手段３０のオン／オフを切り換えさせるとともに、スイッチング手段３０のオンデューティー比を制御する制御手段４０とを備えた照明装置であって、ダイヤル等により使用者等が所望の輝度に調整可能な外部調光機構によって、所望の輝度値となるようにオンデューティー比を制御手段４０によって制御し、該オンデューティー比に応じてスイッチング手段３０をオン／オフすることで有機ＥＬ素子１０を点滅発光させている。ここでスイッチング手段３０は交流電源ＰＳよりも高い周波数でスイッチングを行うため、輝度のちらつきを防止するとともに発光寿命を向上させている。また制御手段４０においてオンデューティー比を可変的に制御することで、所望の輝度を得ることができるようになっている。
特開２００５−７８８２８号公報 As shown in FIG. 4, this conventional example includes a converter means 20 that converts AC power supplied from an AC power source PS into DC power, and an organic EL element by turning on / off the DC current supplied from the converter means 20. Switching means 30 for intermittently supplying a forward current to 10 and control for switching on / off of the switching means 30 at a switching frequency higher than that of the AC input power supply PS and controlling the on-duty ratio of the switching means 30 The on-duty ratio is controlled by the control means 40 so that a desired brightness value is obtained by an external dimming mechanism that can be adjusted to a desired brightness by a dial or the like. The organic EL element 10 is caused to blink by turning on / off the switching means 30 according to the on-duty ratio. It is made to. Here, since the switching means 30 performs switching at a frequency higher than that of the AC power supply PS, the flickering of luminance is prevented and the light emission life is improved. In addition, by controlling the on-duty ratio variably in the control means 40, a desired luminance can be obtained.
JP-A-2005-78828

ところで、上記従来例のような照明装置を調光型の蛍光灯照明器具と組合わせて使用し、該蛍光灯照明器具の蛍光灯安定器用の調光コントローラで照明装置及び蛍光灯照明器具を同時に調光する場合が考えられる。この種の調光コントローラと蛍光灯照明器具との組み合わせにおいては、調光に用いる調光信号としては、調光比（全点灯時を１００％とした明るさ）とオンデューティー比が正比例の関係にある調光信号と、調光比とオンデューティー比が逆比例の関係にある調光信号のいずれかが使用される。正比例の関係にある調光信号を使用する場合は、調光コントローラで調光比を上げた時に、照明装置と蛍光灯照明器具のいずれの照明も明るくなり問題無いが、逆比例の関係にある調光信号を使用する場合には、調光コントローラで調光比を上げた時に、蛍光灯照明器具では照明が明るくなる一方で、照明装置では照明が暗くなり照明装置と蛍光灯照明器具との調光が統一されないという問題があった。   By the way, the illumination device as in the above conventional example is used in combination with a dimming type fluorescent lamp lighting fixture, and the lighting device and the fluorescent lamp lighting fixture are simultaneously used by the dimming controller for the fluorescent lamp stabilizer of the fluorescent lamp lighting fixture. The case of dimming is considered. In the combination of this type of dimming controller and fluorescent lamp luminaire, the dimming signal used for dimming is directly proportional to the dimming ratio (brightness with 100% when fully lit) and on-duty ratio. Any one of the dimming signal and the dimming signal in which the dimming ratio and the on-duty ratio are inversely proportional to each other are used. When using dimming signals that are directly proportional, when the dimming ratio is increased by the dimming controller, both the lighting device and the fluorescent lamp illuminator will be bright, but there is no problem, but there is an inversely proportional relationship. When a dimming signal is used, when the dimming ratio is increased by the dimming controller, the illumination is brightened in the fluorescent lamp luminaire, while the illuminator is dimmed and the illumination becomes dark. There was a problem that dimming was not unified.

本発明は、上記問題に鑑みて為されたもので、蛍光灯照明器具と同時に使用する場合にも蛍光灯照明器具で用いられる調光信号によって調光が統一できるような照明装置を提供することを目的とする。   The present invention has been made in view of the above problems, and provides an illuminating device in which dimming can be unified by a dimming signal used in a fluorescent lamp illuminator even when used simultaneously with the fluorescent lamp illuminator. With the goal.

請求項１の発明は、上記目的を達成するために、光源となる固体発光素子と、外部からの調光信号に基づいて固体発光素子に対する直流電圧の印加を入切して光源の調光を行う調光手段とを備え、該調光信号としてオンデューティ比と光源の明るさとが逆比例の関係にあるパルス幅変調信号を用いた照明装置であって、前記調光手段は、入力される調光信号のオンデューティー比が大きくなるにつれて単位時間当たりの電圧印加時間が短くなるように固体発光素子に直流電圧を供給し、入力される調光信号のオンデューティー比が小さくなるにつれて単位時間当たりの電圧印加時間が長くなるように固体発光素子に直流電圧を供給している。   In order to achieve the above object, the first aspect of the present invention controls the dimming of the light source by turning on and off the application of a DC voltage to the solid state light emitting device and the solid state light emitting device based on a dimming signal from the outside. A lighting device using a pulse width modulation signal in which the on-duty ratio and the brightness of the light source are inversely proportional to each other. A DC voltage is supplied to the solid state light emitting device so that the voltage application time per unit time is shortened as the on-duty ratio of the dimming signal increases, and per unit time as the on-duty ratio of the input dimming signal decreases. The direct current voltage is supplied to the solid state light emitting device so that the voltage application time is longer.

請求項２の発明は、上記目的を達成するために、前記調光手段が、ＨｉとＬｏの二値から成る調光信号を反転してスイッチング素子の制御端子に出力する反転回路と、固体発光素子と直列に接続され制御端子に入力される信号がＨｉレベルであるとオンとなり固体発光素子に直流電圧を供給しＬｏレベルであるとオフとなるスイッチング素子とを有している。   According to a second aspect of the present invention, in order to achieve the above object, the dimming means inverts a dimming signal composed of binary values of Hi and Lo and outputs the inverted signal to the control terminal of the switching element, and solid state light emission The switching element is connected in series with the element and turned on when the signal input to the control terminal is at the Hi level, supplies a DC voltage to the solid state light emitting element, and turns off when the signal is at the Lo level.

本発明によれば、調光比とオンデューティー比とが逆比例の関係にある調光信号を反転させて用いることで、蛍光灯照明器具と固体発光素子を用いた照明装置とを同時に使用しても、蛍光灯照明器具に用いられる調光コントローラの調光信号によって調光を統一することができる。   According to the present invention, a dimming signal in which the dimming ratio and the on-duty ratio are inversely proportional to each other is used by reversing, so that a fluorescent lamp illuminator and a lighting device using a solid light emitting element can be used simultaneously. However, the dimming can be unified by the dimming signal of the dimming controller used for the fluorescent lamp lighting apparatus.

（実施形態１）
以下、本発明の第一の実施形態について図１を用いて説明する。本実施形態は、光源となる固体発光素子１と、蛍光灯照明器具の調光に用いられる調光コントローラ２からの調光信号に基づいて固体発光素子１への直流電圧の印加を入切して固体発光素子１の調光を行う調光手段３とを備えている。 (Embodiment 1)
Hereinafter, a first embodiment of the present invention will be described with reference to FIG. In the present embodiment, application of a DC voltage to the solid state light emitting element 1 is turned on and off based on a dimming signal from the solid state light emitting element 1 serving as a light source and a dimming controller 2 used for dimming the fluorescent lamp luminaire. And a dimming means 3 for dimming the solid state light emitting device 1.

固体発光素子１は、たとえば有機ＥＬ素子のように規定の方向に直流電圧が印加されることで発光するもので、ここでは直流電源から供給される直流電圧により駆動しており、調光手段３によって直流電圧の印加を入切することで単位時間当たりの発光時間を変化させることで調光している。また有機ＥＬ素子の他に、発光ダイオード等の他の固体発光素子を用いても構わない。   The solid-state light emitting element 1 emits light when a direct current voltage is applied in a specified direction like an organic EL element, for example, and is driven by a direct current voltage supplied from a direct current power source. The dimming is performed by changing the light emission time per unit time by turning on and off the application of the DC voltage. In addition to the organic EL element, other solid light emitting elements such as a light emitting diode may be used.

調光コントローラ２の前面には操作部２ａと電源スイッチ２ｂとが備えられている。操作部２ａはレバーになっており、図における上下方向にスライドさせることで調光コントローラ２に内臓された可変抵抗器の抵抗値を変更し、該抵抗値に対応した調光比に従ってパルス幅変調された調光信号を出力する。該調光信号によって、蛍光灯照明器具及び固体発光素子１を用いた照明装置それぞれの調光比を同時に調節することができる。ここで調光信号はＨｉとＬｏの二値から成るパルス幅変調信号で、該調光コントローラ２から出力される調光信号は調光比とオンデューティー比が逆比例の関係にあるため、調光つまみ２ａを前記上側方向、すなわち調光比を上げる方向にスライドさせるとオンデューティー比が小さくなり、前記下側方向、すなわち調光比を下げる方向にスライドさせるとオンデューティー比が大きくなるようになっている。電源スイッチ２ｂは、調光コントローラ２の電源である交流電源から供給される交流電力を入切するものである。   An operation unit 2a and a power switch 2b are provided on the front surface of the dimming controller 2. The operation unit 2a is a lever that changes the resistance value of the variable resistor incorporated in the dimming controller 2 by sliding in the vertical direction in the figure, and performs pulse width modulation according to the dimming ratio corresponding to the resistance value. The adjusted dimming signal is output. With the dimming signal, the dimming ratios of the fluorescent lamp lighting fixture and the lighting device using the solid light emitting element 1 can be adjusted simultaneously. Here, the dimming signal is a pulse width modulation signal composed of binary values of Hi and Lo, and the dimming signal output from the dimming controller 2 has a dimming ratio and an on-duty ratio in an inversely proportional relationship. When the light knob 2a is slid in the upper direction, that is, the direction in which the dimming ratio is increased, the on-duty ratio is decreased, and when the light knob 2a is slid in the lower direction, that is, in the direction in which the dimming ratio is decreased, the on-duty ratio is increased. It has become. The power switch 2b turns on / off AC power supplied from an AC power source that is a power source of the dimming controller 2.

調光手段３はＨｉとＬｏの二値から成る調光信号を反転してスイッチング素子の制御端子に出力する反転回路３ａと、固体発光素子１と直列に接続されて、制御端子に入力される信号がＨｉレベルであるとオンとなり固体発光素子１に直流電圧を供給し、Ｌｏレベルであるとオフとなるスイッチング素子３ｂとで構成される。調光信号は電圧が１０Ｖ、周波数が１ｋＨｚのものが一般的であるので、スイッチング素子３ｂに低電圧でも駆動することができるＭＯＳＦＥＴを用いると調光信号によって直接駆動することが可能である。またスイッチング素子３ｂを直接駆動しない場合には、調光信号をスイッチング素子３ｂの制御信号として利用し、駆動用にバッファ回路を設ければよい。   The dimming means 3 is connected in series to the inverting circuit 3a that inverts the dimming signal consisting of binary values of Hi and Lo and outputs it to the control terminal of the switching element, and is input to the control terminal. The switching element 3b is turned on when the signal is at the Hi level, supplies a DC voltage to the solid state light emitting element 1, and is turned off when the signal is at the Lo level. Since the dimming signal generally has a voltage of 10 V and a frequency of 1 kHz, if the switching element 3b is a MOSFET that can be driven even at a low voltage, it can be directly driven by the dimming signal. When the switching element 3b is not directly driven, a dimming signal may be used as a control signal for the switching element 3b and a buffer circuit may be provided for driving.

以下、本発明の動作を説明する。固体発光素子１は直流電源と調光手段３と直列に接続されており、調光手段３のスイッチング素子３ｂのオン／オフの切り換えによって直流電圧の印加の入切を行うことで点滅発光する。スイッチング素子３ｂは調光コントローラ２から出力される調光信号を反転回路３ａによって反転させたパルス幅変調信号により駆動し、該パルス幅変調信号がＨｉの時にスイッチをオンにすることで固体発光素子１に直流電圧を供給し、Ｌｏの時にスイッチをオフにする。   The operation of the present invention will be described below. The solid-state light emitting element 1 is connected in series with a DC power source and the light control means 3, and flashes and emits light by turning on / off the DC voltage by switching on / off the switching element 3 b of the light control means 3. The switching element 3b is driven by a pulse width modulation signal obtained by inverting the dimming signal output from the dimming controller 2 by the inverting circuit 3a, and the switch is turned on when the pulse width modulation signal is Hi so that the solid state light emitting element DC voltage is supplied to 1 and the switch is turned off when Lo.

たとえば図２（ｂ）に示すオンデューティー比が５０％の調光信号の場合の明るさと比較すると、同図（ａ）のように、オンデューティー比が２５％の調光信号の場合、反転回路３ａによってオンデューティー比が７５％のパルス幅変調信号に変換され、この信号によってスイッチング素子３ｂを駆動するため、単位時間当たりの電圧印加時間が長くなり固体発光素子１の明るさはオンデューティー比が５０％の場合と比較して明るくなる。同図（ｃ）のように、オンデューティー比が７５％の調光信号の場合は、反転回路３ａによってオンデューティー比が２５％のパルス幅変調信号に変換され、この信号によってスイッチング素子３ｂを駆動するため、単位時間当たりの電圧印加時間が短くなり固体発光素子１の明るさはオンデューティー比が５０％の場合と比較して暗くなる。上述のように、照明装置において調光コントローラ２から出力される調光信号を反転して使用することで、照明装置と蛍光灯照明器具の調光が統一される。   For example, when compared with the brightness in the case of the dimming signal having an on-duty ratio of 50% shown in FIG. 2B, the inversion circuit in the case of the dimming signal having an on-duty ratio of 25% as shown in FIG. 3a is converted into a pulse width modulation signal having an on-duty ratio of 75%, and the switching element 3b is driven by this signal. Therefore, the voltage application time per unit time is increased, and the brightness of the solid-state light-emitting element 1 has an on-duty ratio. Brighter than 50%. In the case of a dimming signal with an on-duty ratio of 75%, as shown in FIG. 5C, the inverter circuit 3a converts it to a pulse width modulation signal with an on-duty ratio of 25%, and this signal drives the switching element 3b. Therefore, the voltage application time per unit time is shortened, and the brightness of the solid state light emitting device 1 becomes darker than that when the on-duty ratio is 50%. As described above, the dimming of the lighting device and the fluorescent lamp illuminating device is unified by using the dimming signal output from the dimming controller 2 in the lighting device by inverting it.

（実施形態２）
以下、本発明の第二の実施形態について図３を用いて説明する。本実施形態は、第一の実施形態と基本構成及び動作はほぼ同じであるが、図３に示すように、固体発光素子１を複数個直列に接続しており、これら固体発光素子１と直列に接続された調光手段３によって調光を行っている。また第一の実施形態では固体発光素子１の電源として直流電源を用いていたが、本実施形態では調光コントローラ２に用いられている交流電源から供給される交流電圧を、交流電圧を全波整流するダイオードブリッジ回路４ａと電解コンデンサ４ｂから成る整流回路４を通して平滑直流電圧にして、この直流電圧を用いて複数の固体発光素子１を発光させている。また、これら固体発光素子１は第一の実施形態と同様に、調光コントローラ２の調光信号を反転回路３ａによって反転させたパルス幅変調信号をスイッチング素子３ｂに入力することで発光させており、点灯状態は図２と同じである。 (Embodiment 2)
Hereinafter, a second embodiment of the present invention will be described with reference to FIG. This embodiment has substantially the same basic configuration and operation as the first embodiment, but a plurality of solid state light emitting devices 1 are connected in series as shown in FIG. Dimming is performed by the dimming means 3 connected to the. In the first embodiment, the DC power source is used as the power source of the solid state light emitting device 1. However, in this embodiment, the AC voltage supplied from the AC power source used in the dimming controller 2 is changed to a full-wave AC voltage. A smooth DC voltage is made through a rectifier circuit 4 comprising a diode bridge circuit 4a and an electrolytic capacitor 4b for rectification, and a plurality of solid state light emitting devices 1 are caused to emit light using this DC voltage. Further, as in the first embodiment, these solid state light emitting elements 1 emit light by inputting a pulse width modulation signal obtained by inverting the dimming signal of the dimming controller 2 by the inverting circuit 3a to the switching element 3b. The lighting state is the same as in FIG.

交流電圧を整流して得られる平滑直流電圧をＶｄ、固体発光素子１の定格時のオン電圧をＶｏとすると、固体発光素子１はＶｄ／Ｖｏを越えない最大の整数個まで原理的に接続可能である。ただし、実際には交流電源の周期のリプルが存在するために電圧が少なからず変動し、またスイッチング素子３ｂのオン電圧や損失等を考慮すると、原理的な数より１個少ない数以下で用いることが望ましい。また昇圧チョッパ回路又は降圧チョッパ回路を用いることで平滑直流電圧を調節し、任意の個数の固体発光素子１を発光させることができる。   Assuming that the smoothing DC voltage obtained by rectifying the AC voltage is Vd, and the rated on-voltage of the solid state light emitting device 1 is Vo, the solid state light emitting device 1 can be connected in principle up to the maximum integer number not exceeding Vd / Vo. It is. However, in actuality, there is a ripple of the cycle of the AC power supply, so that the voltage fluctuates not a little. In consideration of the on-voltage and loss of the switching element 3b, the number used is one less than the theoretical number. Is desirable. Further, by using a step-up chopper circuit or a step-down chopper circuit, the smooth DC voltage can be adjusted, and an arbitrary number of solid state light emitting devices 1 can emit light.

本発明の第一の実施形態の回路構成を示す図である。It is a figure which shows the circuit structure of 1st embodiment of this invention. パルス幅変調信号と固体発光素子の点灯状態の信号波形を示す図である。It is a figure which shows the signal waveform of the lighting state of a pulse width modulation signal and a solid light emitting element. 本発明の第二の実施形態の回路構成を示す図である。It is a figure which shows the circuit structure of 2nd embodiment of this invention. 従来の有機ＥＬ素子を光源とした照明装置の回路構成を示す図である。It is a figure which shows the circuit structure of the illuminating device which used the conventional organic EL element as the light source.

符号の説明Explanation of symbols

１ 固体発光素子
２ 調光コントローラ
２ａ 調光つまみ
２ｂ 電源スイッチ
３ 調光手段
３ａ 反転回路
３ｂ スイッチング素子 DESCRIPTION OF SYMBOLS 1 Solid light emitting element 2 Dimming controller 2a Dimming knob 2b Power switch 3 Dimming means 3a Inversion circuit 3b Switching element

Claims (2)

光源となる固体発光素子と、外部からの調光信号に基づいて固体発光素子に対する直流電圧の印加を入切して光源の調光を行う調光手段とを備え、該調光信号としてオンデューティ比と光源の明るさとが逆比例の関係にあるパルス幅変調信号を用いた照明装置であって、前記調光手段は、入力される調光信号のオンデューティー比が大きくなるにつれて単位時間当たりの電圧印加時間が短くなるように固体発光素子に直流電圧を供給し、入力される調光信号のオンデューティー比が小さくなるにつれて単位時間当たりの電圧印加時間が長くなるように固体発光素子に直流電圧を供給することを特徴とする照明装置。   A solid-state light-emitting element serving as a light source; and a light-modulating means for dimming the light source by turning on and off the application of a DC voltage to the solid-state light-emitting element based on a light-control signal from the outside. A lighting device using a pulse width modulation signal in which the ratio and the brightness of the light source are inversely proportional to each other, wherein the dimming means per unit time as the on-duty ratio of the input dimming signal increases. A DC voltage is supplied to the solid state light emitting device so that the voltage application time is shortened, and the direct current voltage is applied to the solid state light emitting device so that the voltage application time per unit time becomes longer as the on-duty ratio of the input dimming signal becomes smaller. A lighting device characterized by supplying 前記調光手段は、ＨｉとＬｏの二値から成る調光信号を反転してスイッチング素子の制御端子に出力する反転回路と、固体発光素子と直列に接続され制御端子に入力される信号がＨｉレベルであるとオンとなり固体発光素子に直流電圧を供給しＬｏレベルであるとオフとなるスイッチング素子とを有することを特徴とする請求項１記載の照明装置。
The dimming means inverts a dimming signal consisting of binary values of Hi and Lo and outputs the inverted signal to the control terminal of the switching element, and a signal connected to the solid state light emitting element in series and input to the control terminal is Hi. The lighting device according to claim 1, further comprising: a switching element that is turned on when the level is reached, supplies a DC voltage to the solid state light emitting element, and is turned off when the level is the Lo level.
JP2005187258A 2005-06-27 2005-06-27 Lighting system Pending JP2007005258A (en)

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Cited By (1)

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JPS6474066A (en) * 1987-09-11 1989-03-20 Toshiba Electric Equip Power source equipment
JPH02284393A (en) * 1989-04-25 1990-11-21 Matsushita Electric Works Ltd Lighting load controlling device
JP2003217323A (en) * 2002-01-18 2003-07-31 Matsushita Electric Ind Co Ltd Led light-emitting device
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JP2007529872A (en) * 2004-03-15 2007-10-25 カラー・キネティックス・インコーポレーテッド Power control method and apparatus

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