JP5341067B2 - Led故障検出回路 - Google Patents
Led故障検出回路 Download PDFInfo
- Publication number
- JP5341067B2 JP5341067B2 JP2010504945A JP2010504945A JP5341067B2 JP 5341067 B2 JP5341067 B2 JP 5341067B2 JP 2010504945 A JP2010504945 A JP 2010504945A JP 2010504945 A JP2010504945 A JP 2010504945A JP 5341067 B2 JP5341067 B2 JP 5341067B2
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- JP
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- Prior art keywords
- voltage
- led
- coupled
- detection circuit
- transistor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000001514 detection method Methods 0.000 title claims abstract description 45
- 239000003990 capacitor Substances 0.000 claims description 20
- 230000002950 deficient Effects 0.000 abstract description 14
- 238000010586 diagram Methods 0.000 description 4
- 230000006870 function Effects 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
- 230000001747 exhibiting effect Effects 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Images
Classifications
-
- 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]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
- H05B45/58—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits involving end of life detection of LEDs
-
- 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]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
- Led Devices (AREA)
Description
演算増幅器装置OAは、最高電圧信号を受け取るための前記最高電圧検出器の出力端子Toutに接続されていると共に、基準電圧Vrefに接続されている。演算増幅器装置OAは、前記最高電圧信号と基準電圧Vrefとを比較する。演算増幅器装置OAの出力は、抵抗器R5を介して、第2のトランジスタQ2のベースに接続されている。前記演算増幅器装置の出力が高い場合、第2のトランジスタQ2は導通し、結果として、故障検出信号端子Voutに低い電圧をもたらす。前記演算増幅器装置の出力が低い場合、第2のトランジスタQ2は導通せず、結果として、故障検出信号端子Voutにおける高い電圧(供給電圧Vsにほぼ等しい)をもたらす。
Claims (6)
- 電力信号を受け取るDC−DCコンバータ回路に結合されているLEDの、不具合を検出する故障検出回路であって、
− 前記LEDの両端の電圧を検出するために前記LEDに結合されていると共に、最高電圧信号を供給するための最高電圧端子を有している最高電圧検出器と、
− 第1の入力信号として前記最高電圧信号を受け取るために前記最高電圧端子に結合されていると共に、第2の入力信号としての基準電圧を供給するように構成されている基準電圧端子に結合されている差動アンプであって、故障検出信号を供給する出力端子を有している差動アンプと、
を有し、
前記最高電圧検出器は、ダイオードとコンデンサとの直列接続を有しており、前記ダイオードのアノードは、前記LEDに結合され、前記ダイオードのカソードは、前記コンデンサに結合され、前記最高電圧端子は、前記ダイオードと前記コンデンサとの間のノードに設けられている、故障検出回路。 - 抵抗器が、前記コンデンサに対して並列に結合されている、請求項1に記載の故障検出回路。
- 前記差動アンプは、前記第1の入力信号が第1のトランジスタのベースに供給され、前記第2の入力信号が第2のトランジスタのベースに供給される、トランジスタの差動対を有しており、前記出力端子は、前記第2のトランジスタのコレクタに結合されている、請求項1に記載の故障検出回路。
- 前記差動アンプは、前記第1の入力信号と前記第2の入力信号との間の電圧差を増幅し、電圧差信号を出力する演算増幅器装置を有している、請求項1に記載の故障検出回路。
- トランジスタを更に有しており、前記トランジスタのベースは、前記電圧差信号を受け取るために前記演算増幅器装置に結合されており、前記差動アンプの出力端子は、前記トランジスタのコレクタに結合されている、請求項4に記載の故障検出回路。
- 前記ダイオードの前記カソードは、抵抗器を介して前記コンデンサに結合されている、請求項1乃至5の何れか一項に記載の故障検出回路。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP07107165.8 | 2007-04-27 | ||
EP07107165 | 2007-04-27 | ||
PCT/IB2008/051553 WO2008132661A1 (en) | 2007-04-27 | 2008-04-23 | Led outage detection circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2010524777A JP2010524777A (ja) | 2010-07-22 |
JP5341067B2 true JP5341067B2 (ja) | 2013-11-13 |
Family
ID=39722640
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2010504945A Active JP5341067B2 (ja) | 2007-04-27 | 2008-04-23 | Led故障検出回路 |
Country Status (11)
Country | Link |
---|---|
US (1) | US8076953B2 (ja) |
EP (2) | EP3468303B1 (ja) |
JP (1) | JP5341067B2 (ja) |
KR (1) | KR101517353B1 (ja) |
CN (1) | CN101669405B (ja) |
DK (1) | DK2145508T3 (ja) |
ES (1) | ES2688940T3 (ja) |
PL (1) | PL2145508T3 (ja) |
TR (1) | TR201815479T4 (ja) |
TW (1) | TWI455651B (ja) |
WO (1) | WO2008132661A1 (ja) |
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-
2008
- 2008-04-23 EP EP18188301.8A patent/EP3468303B1/en active Active
- 2008-04-23 CN CN2008800138512A patent/CN101669405B/zh active Active
- 2008-04-23 JP JP2010504945A patent/JP5341067B2/ja active Active
- 2008-04-23 DK DK08737957.4T patent/DK2145508T3/en active
- 2008-04-23 PL PL08737957T patent/PL2145508T3/pl unknown
- 2008-04-23 TR TR2018/15479T patent/TR201815479T4/tr unknown
- 2008-04-23 WO PCT/IB2008/051553 patent/WO2008132661A1/en active Application Filing
- 2008-04-23 KR KR1020097024700A patent/KR101517353B1/ko active IP Right Grant
- 2008-04-23 US US12/596,863 patent/US8076953B2/en active Active
- 2008-04-23 EP EP08737957.4A patent/EP2145508B1/en not_active Revoked
- 2008-04-23 ES ES08737957.4T patent/ES2688940T3/es active Active
- 2008-04-24 TW TW097115122A patent/TWI455651B/zh active
Also Published As
Publication number | Publication date |
---|---|
EP2145508B1 (en) | 2018-08-15 |
KR101517353B1 (ko) | 2015-05-04 |
DK2145508T3 (en) | 2018-11-12 |
WO2008132661A1 (en) | 2008-11-06 |
TW200913786A (en) | 2009-03-16 |
CN101669405B (zh) | 2012-06-13 |
EP3468303B1 (en) | 2024-03-06 |
EP3468303A1 (en) | 2019-04-10 |
KR20100017403A (ko) | 2010-02-16 |
US8076953B2 (en) | 2011-12-13 |
EP3468303C0 (en) | 2024-03-06 |
TR201815479T4 (tr) | 2018-11-21 |
US20100117656A1 (en) | 2010-05-13 |
TWI455651B (zh) | 2014-10-01 |
JP2010524777A (ja) | 2010-07-22 |
ES2688940T3 (es) | 2018-11-07 |
CN101669405A (zh) | 2010-03-10 |
EP2145508A1 (en) | 2010-01-20 |
PL2145508T3 (pl) | 2019-01-31 |
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