JP2010526696A - 直列接続されたledを制御する方法及び装置 - Google Patents
直列接続されたledを制御する方法及び装置 Download PDFInfo
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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
- 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
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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]
- H05B45/20—Controlling the colour of the light
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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]
Abstract
Description
本開示の目的で使用される場合、"LED"なる用語は、電気信号に応答して放射を発生することが可能な如何なるエレクトロルミネッセントダイオード又は他の形式のキャリア注入/接合型システムをも含むものと理解されるべきである。このように、LEDなる用語は、これらに限定されるものではないが、電流に応答して光を放出する種々の半導体型構造、発光ポリマ、有機発光ダイオード(OLED)及びエレクトロルミネッセントストリップ等を含む。
以下の特許及び特許出願が、参照により本明細書に組み込まれる:
・"多色LED照明方法及び装置"なる名称の2000年1月18日に発行された米国特許第6,016,038号;
・"照明部品"なる名称の2001年4月3日に発行された米国特許第6,211,626号;
・"ネットワーク化された照明システムにおける装置を制御する方法及び装置"なる名称の2003年8月19日に発行された米国特許第6,608,453号;
・"ネットワーク化された照明システムにおける装置を制御する方法及び装置"なる名称の2004年8月17日に発行された米国特許第6,777,891号;
・"抵抗性負荷をシミュレーションする方法及び装置"なる名称の2007年8月9日に出願された米国特許出願第11/836,560号。
LED型光源は1以上のLEDを含み得、従って上記電圧Vsourceは該光源を構成する一群のLEDに供給することができ、上記電流Isourceは斯かるLEDの群により取り込まれ得ることを想起されたい。駆動された場合の当該光源の両端間の一定電圧Vsource、及び駆動された場合の該光源により取り込まれる調整された電流Isourceは、該光源の瞬時作動電力Psourceの流を決定する(Psource=Vsource・Isource)。前述したように、LED型光源は、調整された電流を用いて、可変LED駆動電流が採用されたとしたら生じるかも知れないLED出力の可能性のある望ましくない又は予測不可能な変動を軽減する。PWM技術によれば、当該光源に電圧Vsourceを周期的に印加すると共に、所与のオンオフサイクルの間において該電圧が印加される時間を変化させることにより、時間にわたり該光源に供給される平均電力(平均作動電力)を変調することができる。特に、コントローラ105は上記電圧Vsourceを所与の光源にパルス状態様で(例えば、当該光源に電圧を印加する1以上のスイッチを作動させる制御信号を出力することにより)、好ましくは人の目により検出することが可能なものより高い(例えば、約100Hzより高い)周波数で印加するように構成することができる。この様にして、当該光源により発生される光の観察者は、離散的なオンオフサイクル(通常、"フリッカ効果"と呼ばれる)を知覚することがなく、代わりに、目の積分機能が実質的に連続した光の発生を知覚する。上記制御信号のオンオフサイクルのパルス幅(即ち、オン時間又は"デューティサイクル")を調整することにより、該コントローラは如何なる所与の期間において当該光源が駆動される時間の平均量をも変化させ、かくして、該光源の平均作動電力を変化させる。この様にして、各チャンネルからの発生光の知覚される輝度を変化させることができる。
Claims (25)
- 第1ノードと第2ノードとの間に直列に接続された少なくとも2つのLEDであって、前記第1ノードと第2ノードとの間に作動電圧が印加された場合に前記第1ノードと第2ノードとの間に直列電流が流れる少なくとも2つのLEDと、
前記少なくとも2つのLEDのうちの少なくとも第1のLEDに並列に接続されて、前記第1のLEDに対して前記直列電流を少なくとも部分的に迂回させる少なくとも1つの制御可能な電流経路と、
前記作動電圧を表す少なくとも1つのパラメータをモニタすると共に、前記少なくとも2つのLEDにおける前記作動電圧により駆動することができる最大数のLEDを決定し、前記少なくとも1つの制御可能な電流経路を、前記最大数が前記直列に接続された少なくとも2つのLEDの全ての合計数より小さい場合に少なくとも前記第1のLEDに対して迂回される前記直列電流の量を増加させるように制御する少なくとも1つのコントローラと、
を有する装置。 - 前記少なくとも1つのコントローラが、前記少なくとも1つの制御可能な電流経路を、前記少なくとも1つのパラメータが前記作動電圧が所定の閾値より小さいことを示す場合に前記第1のLEDに対して迂回される前記直列電流の量を増加させるように制御し、前記所定の閾値が前記少なくとも2つのLEDの全てを駆動するのに必要な最小作動電圧を表す請求項1に記載の装置。
- 前記少なくとも1つのコントローラが、前記少なくとも1つの制御可能な電流経路を、前記第1のLEDに対し前記直列電流を大幅に迂回させるように制御して、該第1のLEDを短絡させる請求項1に記載の装置。
- 前記少なくとも2つのLEDが、前記第1ノードと前記第2ノードとの間に直列に接続された少なくとも3つのLEDを含み、
前記少なくとも1つの制御可能な電流経路が、前記少なくとも1つのコントローラに応答する複数の制御可能な電流経路を含み、各電流経路が前記少なくとも3つのLEDのうちの少なくとも1つに並列に接続される、
請求項1に記載の装置。 - 前記少なくとも3つのLEDが第1の数のLEDを含み、前記複数の制御可能な電流経路が第2の数の制御可能な電流経路を含み、前記第1の数と前記第2の数とが相違する請求項4に記載の装置。
- 前記少なくとも3つのLEDが第1の数のLEDを含み、前記複数の制御可能な電流経路が第2の数の制御可能な電流経路を含み、前記第1の数と前記第2の数とが同一であり、各電流経路が前記少なくとも3つのLEDのうちの対応するLEDに並列に接続される請求項4に記載の装置。
- 前記少なくとも1つのコントローラが前記複数の制御可能な電流経路のうちの少なくとも幾つかを制御し、前記コントローラにより制御される各々の制御可能な電流経路が、前記少なくとも3つのLEDの全てよりは少ないLEDが同時に駆動されるように、前記少なくとも3つのLEDのうちの対応する前記少なくとも1つに対して前記直列電流を間欠的に迂回させる請求項4に記載の装置。
- 前記少なくとも1つのコントローラが、前記複数の制御可能な電流経路のうちの前記少なくとも幾つかを順番に制御する請求項7に記載の装置。
- 前記少なくとも1つのコントローラが、前記複数の制御可能な電流経路のうちの前記少なくとも幾つかにおける少なくとも2つを同時に制御する請求項7に記載の装置。
- 前記第1ノードと前記第2ノードとの間で前記少なくとも2つのLEDに直列に接続されて前記直列電流を設定する電流源を更に有する請求項1に記載の装置。
- 前記電流源が前記直列電流を前記作動電圧に基づいて設定する請求項10に記載の装置。
- 前記電流源が前記少なくとも1つのコントローラに応答し、前記少なくとも1つのコントローラが、前記直列電流を、前記作動電圧を表す前記モニタされた少なくとも1つのパラメータに部分的に基づいて制御する請求項10に記載の装置。
- 前記少なくとも1つのコントローラが前記電流源を、前記作動電圧が減少するにつれて前記直列電流を増加させるように制御する請求項12に記載の装置。
- 前記少なくとも1つのコントローラが前記電流源を、前記作動電圧を表す前記モニタされた少なくとも1つのパラメータに少なくとも部分的に基づいて前記直列電流をデューティサイクル変調するように制御する請求項12に記載の装置。
- 第1ノードと第2ノードとの間に直列に接続された複数のLEDを駆動する方法であって、前記第1ノードと第2ノードとの間に作動電圧が印加された場合に前記第1ノードと第2ノードとの間に直列電流が流れ、
A)前記作動電圧を表す少なくとも1つのパラメータをモニタするステップと、
B)前記少なくとも2つのLEDにおける前記作動電圧により駆動することができる最大数のLEDを決定するステップと、
C)前記最大数が前記直列に接続された少なくとも2つのLEDの全ての合計数より小さい場合に、前記複数のLEDの全てよりは少ないLEDが同時に駆動されるように前記複数のLEDのうちの少なくとも1つを短絡するステップと、
を有する方法。 - 前記ステップC)が、前記複数のLEDのうちの異なるLED、又は前記複数のLEDの全てよりは少ないLEDの異なるグループを順番に駆動するステップを有する請求項15に記載の方法。
- 第1ノードと第2ノードとの間に直列に接続された複数のLEDであって、前記第1ノードと第2ノードとの間に作動電圧が印加された場合に前記第1ノードと第2ノードとの間に直列電流が流れる複数のLEDと、
各々が前記複数のLEDのうちの対応するLEDに並列に接続されて、前記複数のLEDのうちの前記対応するLEDに対して前記直列電流を迂回させる複数の制御可能な電流経路と、
前記第1ノードと第2ノードとの間において前記複数のLEDと直列に接続されて、前記直列電流を設定する電流源と、
前記作動電圧に関係する少なくとも1つのパラメータをモニタすると共に、モニタされた前記少なくとも1つのパラメータが前記作動電圧が所定の閾値より小さいことを示す場合に前記複数のLEDの全てよりは少ないLEDが同時に駆動されるように、前記複数の制御可能な電流経路を、前記複数のLEDのうちの対応する各LEDに対して前記直列電流を時間決めされた順序で迂回させるように間欠的に制御する少なくとも1つのコントローラと、
を有する装置。 - 前記少なくとも1つのコントローラが、前記電流源を、前記作動電圧が前記所定の閾値より低下した場合に前記直列電流を増加させて前記複数のLEDにより発生される光の実質的に一定の輝度を維持するように制御する請求項17に記載の装置。
- 前記複数のLEDが、第1スペクトルを持つ第1放射を発生する少なくとも1つの第1LEDと、前記第1スペクトルとは異なる第2スペクトルを持つ第2放射を発生する少なくとも1つの第2LEDとを含み、
前記少なくとも1つのコントローラが、前記複数の制御可能な電流経路を、前記複数のLEDの前記異なるスペクトルに少なくとも部分的に基づく所定の態様で制御する、
請求項17に記載の装置。 - 前記少なくとも1つの第1LEDが、前記第1スペクトルが第1色温度に対応する少なくとも1つの第1白色LEDを含み、
前記少なくとも1つの第2LEDが、前記第2スペクトルが第1色温度とは異なる第2色温度に対応する少なくとも1つの第2白色LEDを含み、
前記少なくとも1つのコントローラが前記複数の制御可能な電流経路を、前記作動電圧が前記所定の閾値より低下した場合に、前記第1スペクトル及び前記第2スペクトルの少なくとも一方に基づく前記複数のLEDにより発生される前記光の全体の色温度が減少するように制御する、
請求項19に記載の装置。 - 自動車用照明装置であって、
少なくとも1つの集積回路チップと、
前記少なくとも1つの集積回路チップのためのパッケージと、
を有し、前記少なくとも1つの集積回路チップが、
第1ノードと第2ノードとの間に直列に接続された第1の数のLEDであって、前記第1ノードと第2ノードとの間に作動電圧が印加された場合に前記第1ノードと第2ノードとの間に直列電流が流れる第1の数のLEDと、
各々が前記第1の数のLEDのうちの対応するLEDに並列に接続されて、前記第1の数のLEDのうちの前記対応するLEDに対して前記直列電流を迂回させる前記第1の数に等しいか該第1の数より少ない第2の数の制御可能な電流経路と、
前記第1ノードと第2ノードとの間において前記第1の数のLEDと直列に接続されて、前記直列電流を設定する電流源と、
前記作動電圧を表す少なくとも1つのパラメータをモニタすると共に、前記第1の数のLEDにおける前記作動電圧により駆動することができる最大数のLEDを決定し、前記最大数が前記第1の数より小さい場合に前記第1の数のLEDの全てよりは少ないLEDが同時に駆動されるように、前記第2の数の制御可能な電流経路を、前記第1の数のLEDのうちの対応する各LEDに対して前記直列電流を迂回させるように制御する少なくとも1つのコントローラと、
とを有し、前記パッケージが自動車のワイヤハーネス又は相補的電気コネクタと組み合わされる少なくとも1つの第1電気コネクタを含み、該少なくとも1つの第1電気コネクタが、前記第1ノードと第2ノードとの間に前記作動電圧を印加するために前記第1ノードに電気的に接続された第1リード線及び前記第2ノードに電気的に接続された第2リード線を少なくとも含む装置。 - 前記第1の数が4である請求項21に記載の装置。
- 前記少なくとも1つのコントローラが情報を受信及び/又は送信するための少なくとも1つの通信ポートを含み、前記少なくとも1つの第1電気コネクタが前記少なくとも1つの通信ポートに電気的に接続された第3リード線を少なくとも含む請求項21に記載の装置。
- 前記少なくとも1つのコントローラが、前記第2の数の制御可能な電流経路を、前記少なくとも1つの通信ポートにより前記第3リード線を介して受信された第1情報に少なくとも部分的に基づいて制御し、前記第1情報が前記自動車に関連した外部条件に関するものである請求項23に記載の装置。
- 前記少なくとも1つのコントローラが第2情報を記憶するために少なくとも1つのメモリを含み、前記少なくとも1つのコントローラが、前記少なくとも1つの通信ポートから前記第3リード線を介して前記第2情報の少なくとも幾らかを送信する請求項23に記載の装置。
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US95630907P | 2007-08-16 | 2007-08-16 | |
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JP2014148253A (ja) * | 2013-02-01 | 2014-08-21 | Koito Mfg Co Ltd | 駆動回路、車輌用灯具 |
WO2014175055A1 (ja) * | 2013-04-25 | 2014-10-30 | コニカミノルタ株式会社 | 照明装置 |
JPWO2014175055A1 (ja) * | 2013-04-25 | 2017-02-23 | コニカミノルタ株式会社 | 照明装置 |
JP2015199458A (ja) * | 2014-04-09 | 2015-11-12 | 市光工業株式会社 | 車両用灯具の点灯回路、車両用灯具の光源ユニット、車両用灯具 |
JP6054563B1 (ja) * | 2016-02-22 | 2016-12-27 | ルーメンス カンパニー リミテッド | 照明装置 |
US10015850B2 (en) | 2016-02-22 | 2018-07-03 | Lumens Co., Ltd. | Lighting apparatus |
WO2020111051A1 (ja) * | 2018-11-27 | 2020-06-04 | 京セラ株式会社 | 照明装置 |
CN113196885A (zh) * | 2018-11-27 | 2021-07-30 | 京瓷株式会社 | 照明设备 |
JPWO2020111051A1 (ja) * | 2018-11-27 | 2021-09-30 | 京セラ株式会社 | 照明装置 |
JP7142101B2 (ja) | 2018-11-27 | 2022-09-26 | 京セラ株式会社 | 照明装置 |
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WO2008060469A3 (en) | 2008-10-02 |
JP2013232419A (ja) | 2013-11-14 |
US7781979B2 (en) | 2010-08-24 |
EP2082621A2 (en) | 2009-07-29 |
JP5366815B2 (ja) | 2013-12-11 |
KR20090082276A (ko) | 2009-07-29 |
ATE474438T1 (de) | 2010-07-15 |
KR101460004B1 (ko) | 2014-11-10 |
WO2008060469A2 (en) | 2008-05-22 |
EP2082621B1 (en) | 2010-07-14 |
US20080122376A1 (en) | 2008-05-29 |
DE602007007804D1 (de) | 2010-08-26 |
JP5757974B2 (ja) | 2015-08-05 |
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