GB201306005D0 - Circuits and methods for driving light sources - Google Patents

Circuits and methods for driving light sources

Info

Publication number
GB201306005D0
GB201306005D0 GBGB1306005.8A GB201306005A GB201306005D0 GB 201306005 D0 GB201306005 D0 GB 201306005D0 GB 201306005 A GB201306005 A GB 201306005A GB 201306005 D0 GB201306005 D0 GB 201306005D0
Authority
GB
United Kingdom
Prior art keywords
state
controller
light source
input voltage
voltage
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.)
Granted
Application number
GBGB1306005.8A
Other versions
GB2503316B (en
GB2503316A (en
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.)
O2Micro Inc
Original Assignee
O2Micro Inc
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
Priority claimed from US13/530,935 external-priority patent/US20120262079A1/en
Application filed by O2Micro Inc filed Critical O2Micro Inc
Publication of GB201306005D0 publication Critical patent/GB201306005D0/en
Publication of GB2503316A publication Critical patent/GB2503316A/en
Application granted granted Critical
Publication of GB2503316B publication Critical patent/GB2503316B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/385—Switched mode power supply [SMPS] using flyback topology
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Landscapes

  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Led Devices (AREA)
  • Dc-Dc Converters (AREA)

Abstract

A circuit 1500 for powering an LED light source 208 includes a filter 1420, a transformer 1422, such as a flyback converter, and a controller 1410. The filter receives an input voltage VIN and filters the input voltage to provide a filtered voltage. The transformer converts the filtered voltage to an output voltage VOUT to power the light source. The controller generates a driving signal 1462 to alternately operate a switch 1424 between a first state and a second state. The controller corrects a power factor of the circuit by controlling time durations of the first state and the second state, such that an input current IIN decreases to a predetermined level during the second state and increases to a peak level proportional to the input voltage during the first state. The controller controls the ratio of time in the first state to time in the second state to adjust an output current IOUT flowing through the light source to a target level.
GB1306005.8A 2012-06-22 2013-04-03 Circuits and methods for driving light sources Expired - Fee Related GB2503316B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US13/530,935 US20120262079A1 (en) 2010-03-04 2012-06-22 Circuits and methods for driving light sources

Publications (3)

Publication Number Publication Date
GB201306005D0 true GB201306005D0 (en) 2013-05-15
GB2503316A GB2503316A (en) 2013-12-25
GB2503316B GB2503316B (en) 2015-10-14

Family

ID=48445191

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1306005.8A Expired - Fee Related GB2503316B (en) 2012-06-22 2013-04-03 Circuits and methods for driving light sources

Country Status (4)

Country Link
JP (1) JP2014007143A (en)
CN (1) CN103517506B (en)
GB (1) GB2503316B (en)
TW (1) TWI505746B (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6256171B2 (en) * 2014-04-18 2018-01-10 三菱電機株式会社 Lighting device and lighting apparatus
GB2544820B (en) * 2015-11-30 2021-03-03 Tridonic Gmbh & Co Kg A low voltage power supply using an earth connection on a terminal block
CN105430795A (en) * 2015-12-11 2016-03-23 成都翰道科技有限公司 Energy saving control system of intelligent LED lamp based on compound double-order filter circuit
CN107301835B (en) * 2016-04-13 2019-09-17 群创光电股份有限公司 Light emitting diode indicator
KR101923158B1 (en) * 2017-12-29 2019-02-27 주식회사 디에스이 multiple stages dimming device of LED light using the wall-switch
JP7016018B2 (en) * 2018-05-31 2022-02-04 パナソニックＩｐマネジメント株式会社 Lighting device and lighting equipment

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE60007610T2 (en) * 1999-07-07 2004-11-18 Koninklijke Philips Electronics N.V. LOCKING CONVERTER AS LED DRIVER
US6784622B2 (en) * 2001-12-05 2004-08-31 Lutron Electronics Company, Inc. Single switch electronic dimming ballast
JP3553042B2 (en) * 2001-12-03 2004-08-11 サンケン電気株式会社 Switching power supply device and driving method thereof
US7911463B2 (en) * 2005-08-31 2011-03-22 O2Micro International Limited Power supply topologies for inverter operations and power factor correction operations
US8692481B2 (en) * 2008-12-10 2014-04-08 Linear Technology Corporation Dimmer-controlled LEDs using flyback converter with high power factor
CN102014540B (en) * 2010-03-04 2011-12-28 凹凸电子（武汉）有限公司 Drive circuit and controller for controlling electric power of light source
US8304999B2 (en) * 2009-06-08 2012-11-06 Sunpaltech Co., Ltd. LED controlling driver and controlling method thereof
WO2010148329A1 (en) * 2009-06-19 2010-12-23 Robertson Transformer Co. Multimodal led power supply with wide compliance voltage and safety controlled output
CN102118906A (en) * 2010-01-04 2011-07-06 叶明宝 DC supply mode of LED street lamp
CN101801129A (en) * 2010-01-28 2010-08-11 海洋王照明科技股份有限公司 LED low-power drive circuit and LED lamp
US8233292B2 (en) * 2010-02-25 2012-07-31 O2Micro, Inc. Controllers, systems and methods for controlling power of light sources
TW201201621A (en) * 2010-06-23 2012-01-01 Solytech Entpr Coropration Power supply device of LED lamp
US8283877B2 (en) * 2011-06-07 2012-10-09 Switch Bulb Company, Inc. Thermal protection circuit for an LED bulb
CN102332814B (en) * 2011-09-14 2013-12-18 矽力杰半导体技术(杭州)有限公司 Power factor correction control circuit for reducing EMI (electro magnetic interference)
CN102438377A (en) * 2011-12-20 2012-05-02 成都成电硅海科技股份有限公司 LED (Light Emitting Diode) constant-current driving circuit with high power factor

Also Published As

Publication number Publication date
TW201401922A (en) 2014-01-01
TWI505746B (en) 2015-10-21
GB2503316B (en) 2015-10-14
CN103517506A (en) 2014-01-15
CN103517506B (en) 2016-05-04
JP2014007143A (en) 2014-01-16
GB2503316A (en) 2013-12-25

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20170403