JP2011254665A - 発光素子の制御回路 - Google Patents
発光素子の制御回路 Download PDFInfo
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- JP2011254665A JP2011254665A JP2010128111A JP2010128111A JP2011254665A JP 2011254665 A JP2011254665 A JP 2011254665A JP 2010128111 A JP2010128111 A JP 2010128111A JP 2010128111 A JP2010128111 A JP 2010128111A JP 2011254665 A JP2011254665 A JP 2011254665A
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- Prior art keywords
- comparator
- clock signal
- voltage
- emitting element
- light emitting
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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]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
- H05B45/375—Switched mode power supply [SMPS] using buck topology
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
-
- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
- Electronic Switches (AREA)
- Dc-Dc Converters (AREA)
Abstract
【解決手段】交流電源を全波整流する整流部30と、クロック信号CLKを生成して出力するクロック発生部42と、発光素子102に流れる電流に応じた比較電圧CSと基準電圧REFとを比較する第1比較器40と、クロック信号CLKに同期してオン状態とされ、第1比較器40において比較電圧CSが基準電圧REF以上になるとオフ状態とされることによって、発光素子102に流れる電流をスイッチングするスイッチング素子38と、を備える構成とする。このとき、クロック発生部42において生成されるクロック信号CLKの周期を変動させることによってノイズを低減又は抑制する。
【選択図】図1
Description
Claims (2)
- 発光素子の発光強度を制御する発光素子の制御回路であって、
交流電源を全波整流する整流部と、
クロック信号を生成して出力するクロック発生部と、
前記発光素子に流れる電流に応じた比較電圧と、第1基準電圧と、を比較する第1比較器と、
前記クロック信号に同期してオン状態とされ、前記第1比較器において前記比較電圧が前記第1基準電圧以上になるとオフ状態とされることによって、前記整流部において整流された電圧により前記発光素子に流れる電流をスイッチングするスイッチング素子と、
を備え、
前記クロック発生部において生成されるクロック信号の周期を変動させることを特徴とする発光素子の制御回路。 - 請求項1に記載の発光素子の制御回路であって、
前記クロック発生部は、
前記クロック信号に同期してカウンタ値を変更するカウンタと、
前記クロック信号に同期して充電と放電を切り換えるコンデンサと、
前記カウンタのカウンタ値に応じて変動する第2基準電圧と、前記コンデンサの端子電圧と、を比較する第2比較器と、
を備え、
前記第2比較器は、前記第2基準電圧と前記コンデンサの比較結果に応じて出力状態を切り換えて前記クロック信号としてパルスを出力することを特徴とする発光素子の制御回路。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2010128111A JP2011254665A (ja) | 2010-06-03 | 2010-06-03 | 発光素子の制御回路 |
CN2011101509176A CN102271446B (zh) | 2010-06-03 | 2011-06-03 | 发光元件的控制电路 |
US13/152,326 US8786348B2 (en) | 2010-06-03 | 2011-06-03 | Control circuit of light-emitting element |
US14/336,844 US9485817B2 (en) | 2010-06-03 | 2014-07-21 | Control circuit of light emitting element |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2010128111A JP2011254665A (ja) | 2010-06-03 | 2010-06-03 | 発光素子の制御回路 |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2011254665A true JP2011254665A (ja) | 2011-12-15 |
JP2011254665A5 JP2011254665A5 (ja) | 2013-07-11 |
Family
ID=45053567
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2010128111A Ceased JP2011254665A (ja) | 2010-06-03 | 2010-06-03 | 発光素子の制御回路 |
Country Status (3)
Country | Link |
---|---|
US (2) | US8786348B2 (ja) |
JP (1) | JP2011254665A (ja) |
CN (1) | CN102271446B (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2013135207A (ja) * | 2011-12-26 | 2013-07-08 | Samsung Electro-Mechanics Co Ltd | 発光ダイオード駆動装置 |
CN103929854A (zh) * | 2014-04-02 | 2014-07-16 | 深圳市明微电子股份有限公司 | 一种led驱动装置及其led调光控制器 |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101422939B1 (ko) * | 2012-12-05 | 2014-07-23 | 삼성전기주식회사 | 역률 보상 회로 구동 장치 |
CN103151928B (zh) * | 2013-03-20 | 2016-02-03 | 深圳Tcl新技术有限公司 | 开关电源电路及其恒定功率输出方法 |
CN203467020U (zh) * | 2013-07-23 | 2014-03-05 | 美芯晟科技(北京)有限公司 | 一种非隔离型led驱动电路 |
CN105960055B (zh) * | 2014-01-28 | 2017-08-08 | 杰华特微电子(杭州)有限公司 | 一种用于led照明器的热插拔保护电路 |
US10045411B2 (en) * | 2016-05-18 | 2018-08-07 | Avago Technologies General Ip (Singapore) Pte. Ltd. | Dual mode light emitting diode (LED) driver |
TWI643528B (zh) * | 2017-10-11 | 2018-12-01 | 茂達電子股份有限公司 | 適應式的背光裝置、系統及其控制方法 |
US10969416B2 (en) * | 2018-12-13 | 2021-04-06 | Silicon Laboratories Inc. | System and method of duplicate circuit block swapping for noise reduction |
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2010
- 2010-06-03 JP JP2010128111A patent/JP2011254665A/ja not_active Ceased
-
2011
- 2011-06-03 CN CN2011101509176A patent/CN102271446B/zh active Active
- 2011-06-03 US US13/152,326 patent/US8786348B2/en active Active
-
2014
- 2014-07-21 US US14/336,844 patent/US9485817B2/en active Active
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH0458756A (ja) * | 1990-06-28 | 1992-02-25 | Tokyo Electric Co Ltd | 定電流チョッパ駆動装置 |
JPH07326486A (ja) * | 1994-06-01 | 1995-12-12 | Hitachi Ltd | Dcdcコンバータ及びそれを用いた放電灯点灯装置 |
JP2009200053A (ja) * | 1999-12-14 | 2009-09-03 | Takion Co Ltd | 電源装置及びledランプ装置 |
JP2002252970A (ja) * | 2001-02-26 | 2002-09-06 | Hitachi Ltd | 電力変換装置 |
JP2008148204A (ja) * | 2006-12-13 | 2008-06-26 | Fuji Electric Device Technology Co Ltd | パルス幅変調回路 |
JP2008236816A (ja) * | 2007-03-16 | 2008-10-02 | Ricoh Co Ltd | スイッチングレギュレータ |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2013135207A (ja) * | 2011-12-26 | 2013-07-08 | Samsung Electro-Mechanics Co Ltd | 発光ダイオード駆動装置 |
CN103929854A (zh) * | 2014-04-02 | 2014-07-16 | 深圳市明微电子股份有限公司 | 一种led驱动装置及其led调光控制器 |
Also Published As
Publication number | Publication date |
---|---|
US20140327367A1 (en) | 2014-11-06 |
US8786348B2 (en) | 2014-07-22 |
US9485817B2 (en) | 2016-11-01 |
CN102271446A (zh) | 2011-12-07 |
US20110298395A1 (en) | 2011-12-08 |
CN102271446B (zh) | 2013-11-13 |
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