JP2006237519A - 駆動回路及び電流制御方法 - Google Patents
駆動回路及び電流制御方法 Download PDFInfo
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Abstract
【解決手段】本発明は、負荷(D)に流す電流(ILED)を所定の電流に制御する駆動回路において、制御端子(Tcnt)と、制御端子(Tcnt)に供給する制御パルスによって負荷(D)に流れる電流を設定する駆動電流設定手段(112)とを有することを特徴とする。
【選択図】図1
Description
制御端子(Tcnt)と、制御端子(Tcnt)に供給する制御パルスによって負荷(D)に流れる電流を設定する駆動電流設定手段(112)とを有することを特徴とする。
〔構成〕
図1は本発明の第1実施例の回路構成図を示す。
図2、図3は本発明の第1実施例の動作説明図を示す。
R13:R14=200:1
に設定されており、抵抗R13に15μAの電流が流れることにより、抵抗R15には、30mAの電流が流れる。よって、端子TLEDから引き込まれる電流ILEDは、30mAとなる。
〔構成〕
図4は本発明の第2実施例のブロック構成図を示す。同図中、図1と同一構成部分には同一符号を付し、その説明は省略する。
図5は本発明の第2実施例の動作説明図を示す。
111 電源回路、112 電流制御回路
121 2ビットレジスタ、122 可変抵抗回路、123 基準電圧源
124 エラーアンプ、125 カレントミラー回路、126 エラーアンプ
R11、R12、R13、R14 抵抗、M1、M2、M3、M4 トランジスタ
D 発光ダイオード
Claims (5)
- 負荷に流す電流を所定の電流に制御する駆動回路において、
制御端子と、
前記制御端子に供給する制御パルスによって前記負荷に流れる電流を設定する駆動電流設定手段とを有することを特徴とする駆動回路。 - 前記駆動電流設定手段は、前記制御パルスの入力数に応じたディジタルデータを作成するデコード回路と、
前記デコード回路で生成されたディジタルデータに応じた抵抗を作成する可変抵抗回路と、
前記可変抵抗回路で作成された抵抗に応じた基準電圧を生成する基準電圧生成手段と、
前記基準電圧生成手段で生成された基準電圧に応じて前記負荷に流れる電流を設定する電流設定回路とを有することを特徴とする請求項1記載の駆動回路。 - 負荷に流す電流を所定の電流に制御する駆動回路において、
電圧が印加される制御端子と、
前記制御端子に印加する電圧に基づいて前記負荷に流れる電流を設定する駆動電流設定手段とを有することを特徴とする駆動回路。 - 負荷に流す電流を所定の電流に制御する駆動電流制御方法において、
制御端子に供給する制御パルスによって前記負荷に流れる電流を設定することを特徴とする駆動電流制御方法。 - 負荷に流す電流を所定の電流に制御する駆動電流制御方法において、
制御端子に印加する電圧によって前記負荷に流れる電流を設定することを特徴とする駆動電流制御方法。
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Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103401424A (zh) * | 2013-07-19 | 2013-11-20 | 昂宝电子(上海)有限公司 | 用于调整电源变换系统的输出电流的系统和方法 |
US9548652B2 (en) | 2010-12-08 | 2017-01-17 | On-Bright Electronics (Shanghai) Co., Ltd. | System and method providing over current protection based on duty cycle information for power converter |
US9553501B2 (en) | 2010-12-08 | 2017-01-24 | On-Bright Electronics (Shanghai) Co., Ltd. | System and method providing over current protection based on duty cycle information for power converter |
US9564811B2 (en) | 2014-04-18 | 2017-02-07 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for regulating output currents of power conversion systems |
US9577536B2 (en) | 2015-02-02 | 2017-02-21 | On-Bright Electronics (Shanghai) Co., Ltd. | System and method providing reliable over current protection for power converter |
US9584005B2 (en) | 2014-04-18 | 2017-02-28 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for regulating output currents of power conversion systems |
US9647448B2 (en) | 2005-08-18 | 2017-05-09 | On-Bright Electronics (Shanghai) Co., Ltd. | System and method providing over current and over power protection for power converter |
US9960674B2 (en) | 2015-05-15 | 2018-05-01 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for output current regulation in power conversion systems |
US10003268B2 (en) | 2015-05-15 | 2018-06-19 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for output current regulation in power conversion systems |
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JP2001274645A (ja) * | 2000-03-24 | 2001-10-05 | Sanyo Electric Co Ltd | 演算増幅回路および集積回路 |
JP2003187988A (ja) * | 2001-12-20 | 2003-07-04 | Sharp Corp | 白色発光ダイオードの駆動装置 |
JP2003215534A (ja) * | 2002-01-23 | 2003-07-30 | Seiko Epson Corp | 液晶ディスプレイのバックライト制御装置 |
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Cited By (33)
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US9647448B2 (en) | 2005-08-18 | 2017-05-09 | On-Bright Electronics (Shanghai) Co., Ltd. | System and method providing over current and over power protection for power converter |
US10277110B2 (en) | 2010-12-08 | 2019-04-30 | On-Bright Electronics (Shanghai) Co., Ltd. | System and method providing over current protection based on duty cycle information for power converter |
US9548652B2 (en) | 2010-12-08 | 2017-01-17 | On-Bright Electronics (Shanghai) Co., Ltd. | System and method providing over current protection based on duty cycle information for power converter |
US9553501B2 (en) | 2010-12-08 | 2017-01-24 | On-Bright Electronics (Shanghai) Co., Ltd. | System and method providing over current protection based on duty cycle information for power converter |
US11264888B2 (en) | 2010-12-08 | 2022-03-01 | On-Bright Electronics (Shanghai) Co., Ltd. | System and method providing over current protection based on duty cycle information for power converter |
US11114933B2 (en) | 2010-12-08 | 2021-09-07 | On-Bright Electronics (Shanghai) Co., Ltd. | System and method providing over current protection based on duty cycle information for power converter |
US10811955B2 (en) | 2010-12-08 | 2020-10-20 | On-Bright Electronics (Shanghai) Co., Ltd. | System and method providing over current protection based on duty cycle information for power converter |
US10615684B2 (en) | 2010-12-08 | 2020-04-07 | On-Bright Electronics (Shanghai) Co., Ltd. | System and method providing over current protection based on duty cycle information for power converter |
US10581315B2 (en) | 2010-12-08 | 2020-03-03 | On-Bright Electronics (Shanghai) Co., Ltd. | System and method providing over current protection based on duty cycle information for power converter |
US10483838B2 (en) | 2010-12-08 | 2019-11-19 | On-Bright Electronics (Shanghai) Co., Ltd. | System and method providing over current protection based on duty cycle information for power converter |
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CN103401424A (zh) * | 2013-07-19 | 2013-11-20 | 昂宝电子(上海)有限公司 | 用于调整电源变换系统的输出电流的系统和方法 |
US11108328B2 (en) | 2013-07-19 | 2021-08-31 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for high precision and/or low loss regulation of output currents of power conversion systems |
US9614445B2 (en) | 2013-07-19 | 2017-04-04 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for high precision and/or low loss regulation of output currents of power conversion systems |
US10177665B2 (en) | 2013-07-19 | 2019-01-08 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for high precision and/or low loss regulation of output currents of power conversion systems |
US10686359B2 (en) | 2014-04-18 | 2020-06-16 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for regulating output currents of power conversion systems |
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US9991802B2 (en) | 2014-04-18 | 2018-06-05 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for regulating output currents of power conversion systems |
US9570986B2 (en) | 2014-04-18 | 2017-02-14 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for regulating output currents of power conversion systems |
US10044254B2 (en) | 2014-04-18 | 2018-08-07 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for regulating output currents of power conversion systems |
US10170999B2 (en) | 2014-04-18 | 2019-01-01 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for regulating output currents of power conversion systems |
US9584005B2 (en) | 2014-04-18 | 2017-02-28 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for regulating output currents of power conversion systems |
US10211626B2 (en) | 2015-02-02 | 2019-02-19 | On-Bright Electronics (Shanghai) Co., Ltd. | System and method providing reliable over current protection for power converter |
US9577536B2 (en) | 2015-02-02 | 2017-02-21 | On-Bright Electronics (Shanghai) Co., Ltd. | System and method providing reliable over current protection for power converter |
US10680525B2 (en) | 2015-05-15 | 2020-06-09 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for output current regulation in power conversion systems |
US10686373B2 (en) | 2015-05-15 | 2020-06-16 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for output current regulation in power conversion systems |
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