JP4881275B2 - Led点灯駆動装置 - Google Patents
Led点灯駆動装置 Download PDFInfo
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- JP4881275B2 JP4881275B2 JP2007270150A JP2007270150A JP4881275B2 JP 4881275 B2 JP4881275 B2 JP 4881275B2 JP 2007270150 A JP2007270150 A JP 2007270150A JP 2007270150 A JP2007270150 A JP 2007270150A JP 4881275 B2 JP4881275 B2 JP 4881275B2
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- 238000001514 detection method Methods 0.000 claims description 22
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 238000009499 grossing Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
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Description
なお、LED照明ユニットUは、順方向降下電圧がわずかにばらつく特性を持つ同一素子からなるLEDを複数個直列接続したものに限らず、順方向降下電圧が大きく異なる特性を持つ異なる素子からなるLEDを複数個組み合わせたものであってもよい。
Claims (3)
- 複数個のLEDを直列接続してなるLED照明ユニットに接続されて、前記接続されたLED照明ユニットを点灯駆動するLED点灯駆動装置であって、
前記LED照明ユニットに対して電力を供給する電源であって、出力する直流電圧を所定の外部信号に基づいて調整する電圧制御部と、前記出力する直流電圧を分圧し、分圧点の電圧によって前記電圧制御部を制御する分圧回路と、前記分圧回路の分圧点に前記外部信号を入力する電圧制御端子とを少なくとも含んでなるものと、
前記LED照明ユニットの通電電流を検出し、該検出した電流値に応じた信号を前記外部信号として前記電圧制御端子に印加する電流検出手段と
を具え、
前記電流検出手段により検出される電流値に応じて前記分圧回路の分圧点の電圧を変動させ、この分圧点の電圧によって前記電圧制御部を制御することにより前記電源が出力する直流電圧の調整を行わせ、前記LED照明ユニットの通電電流を定電流化するように構成したことを特徴とするLED点灯駆動装置。 - 前記電流検出手段は、LED照明ユニットに含まれる直列接続された個々のLEDの順方向降下電圧に応じた通電電流を検出するオペアンプを少なくとも含むことを特徴とする請求項1に記載のLED点灯駆動装置。
- 前記電源は交流電圧を直流電圧に変換する信号変換部を有してなり、前記信号変換部は前記電圧制御部の制御の元に出力する直流電圧を調整しながら交流/直流変換を行うことを特徴とする請求項1又は2に記載のLED点灯駆動装置。
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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JP2007270150A JP4881275B2 (ja) | 2007-10-17 | 2007-10-17 | Led点灯駆動装置 |
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JP2007270150A JP4881275B2 (ja) | 2007-10-17 | 2007-10-17 | Led点灯駆動装置 |
Publications (2)
Publication Number | Publication Date |
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JP2009099780A JP2009099780A (ja) | 2009-05-07 |
JP4881275B2 true JP4881275B2 (ja) | 2012-02-22 |
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ID=40702497
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2007270150A Active JP4881275B2 (ja) | 2007-10-17 | 2007-10-17 | Led点灯駆動装置 |
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JP (1) | JP4881275B2 (ja) |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006085993A (ja) * | 2004-09-15 | 2006-03-30 | Denso Corp | 発光ダイオード点灯装置 |
JP4093239B2 (ja) * | 2005-01-31 | 2008-06-04 | 松下電工株式会社 | 発光ダイオード駆動装置並びにそれを用いた照明器具、車室内用照明装置、車両用照明装置 |
JP4199201B2 (ja) * | 2005-02-14 | 2008-12-17 | 星和電機株式会社 | 電源装置及び照明装置 |
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2007
- 2007-10-17 JP JP2007270150A patent/JP4881275B2/ja active Active
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JP2009099780A (ja) | 2009-05-07 |
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