EP2675246A3 - Semiconductor-light-source control device - Google Patents

Semiconductor-light-source control device Download PDF

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Publication number
EP2675246A3
EP2675246A3 EP20130171423 EP13171423A EP2675246A3 EP 2675246 A3 EP2675246 A3 EP 2675246A3 EP 20130171423 EP20130171423 EP 20130171423 EP 13171423 A EP13171423 A EP 13171423A EP 2675246 A3 EP2675246 A3 EP 2675246A3
Authority
EP
European Patent Office
Prior art keywords
semiconductor
target value
driving current
control device
state
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.)
Withdrawn
Application number
EP20130171423
Other languages
German (de)
French (fr)
Other versions
EP2675246A2 (en
Inventor
Kentarou Murakami
Masaru Sasaki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koito Manufacturing Co Ltd
Original Assignee
Koito Manufacturing Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Koito Manufacturing Co Ltd filed Critical Koito Manufacturing Co Ltd
Publication of EP2675246A2 publication Critical patent/EP2675246A2/en
Publication of EP2675246A3 publication Critical patent/EP2675246A3/en
Withdrawn legal-status Critical Current

Links

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]
    • H05B45/10—Controlling the intensity of the light
    • 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]

Abstract

A semiconductor-light-source control device includes a regulator and a driving control section. The regulator generates a driving current flowing through a semiconductor light source. The driving control section controls the regulator so that a magnitude of the driving current approaches a target value. A luminance of the semiconductor light source is adjusted by repeating a first state in which the magnitude of the driving current is controlled to approach the target value and a second state in which the driving current is smaller than that in the first state. Both the duty ratio of the first and second states and the target value change according to a setting value of the luminance of the semiconductor light source. One of the target value and the duty ratio is set so as to have a one-to-one correspondence relationship with the setting value.
EP20130171423 2012-06-12 2013-06-11 Semiconductor-light-source control device Withdrawn EP2675246A3 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2012132575A JP2013258003A (en) 2012-06-12 2012-06-12 Semiconductor light source control device

Publications (2)

Publication Number Publication Date
EP2675246A2 EP2675246A2 (en) 2013-12-18
EP2675246A3 true EP2675246A3 (en) 2015-05-13

Family

ID=48607123

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20130171423 Withdrawn EP2675246A3 (en) 2012-06-12 2013-06-11 Semiconductor-light-source control device

Country Status (3)

Country Link
EP (1) EP2675246A3 (en)
JP (1) JP2013258003A (en)
CN (1) CN103491670B (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103747569B (en) * 2013-12-25 2015-11-25 矽力杰半导体技术(杭州)有限公司 A kind of PWM dimming controlling method, control circuit and apply its LED drive circuit
US9295129B1 (en) * 2015-04-02 2016-03-22 Osram Sylvania Inc. Turn on optimization
CN104853486A (en) * 2015-04-27 2015-08-19 欧普照明股份有限公司 PWM-based light adjusting circuit
JP6667154B2 (en) 2015-07-09 2020-03-18 パナソニックＩｐマネジメント株式会社 Lighting device, vehicle lighting device, and vehicle using the same
JP6726668B2 (en) * 2015-08-04 2020-07-22 株式会社小糸製作所 Lighting circuit for vehicle lamp and light source
JP6563315B2 (en) * 2015-11-17 2019-08-21 新日本無線株式会社 LED controller
JP6805808B2 (en) * 2016-12-26 2020-12-23 セイコーエプソン株式会社 Light emission control circuit, light source device, and electronic equipment
WO2020032269A1 (en) * 2018-08-10 2020-02-13 株式会社小糸製作所 Lighting circuit and vehicular lamp

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080224633A1 (en) * 2007-03-12 2008-09-18 Cirrus Logic, Inc. Lighting System with Lighting Dimmer Output Mapping
US20120074866A1 (en) * 2010-09-25 2012-03-29 Wei-Qiang Zhang Lighting apparatus and control method thereof

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005332586A (en) * 2004-05-18 2005-12-02 Calsonic Kansei Corp Lighting dimmer
JP2008047494A (en) * 2006-08-21 2008-02-28 Yokogawa Electric Corp Dimming control method, dimming control device and lighting system
JP5457684B2 (en) 2009-01-20 2014-04-02 株式会社小糸製作所 Lighting control device for vehicle lamp
CN102300355B (en) * 2010-06-25 2013-12-25 英飞特电子（杭州）股份有限公司 Light emitting diode (LED) dimming system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080224633A1 (en) * 2007-03-12 2008-09-18 Cirrus Logic, Inc. Lighting System with Lighting Dimmer Output Mapping
US20120074866A1 (en) * 2010-09-25 2012-03-29 Wei-Qiang Zhang Lighting apparatus and control method thereof

Also Published As

Publication number Publication date
EP2675246A2 (en) 2013-12-18
CN103491670B (en) 2016-05-18
JP2013258003A (en) 2013-12-26
CN103491670A (en) 2014-01-01

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