GB201300495D0 - Circuits and methods of driving light sources - Google Patents

Circuits and methods of driving light sources

Info

Publication number
GB201300495D0
GB201300495D0 GBGB1300495.7A GB201300495A GB201300495D0 GB 201300495 D0 GB201300495 D0 GB 201300495D0 GB 201300495 A GB201300495 A GB 201300495A GB 201300495 D0 GB201300495 D0 GB 201300495D0
Authority
GB
United Kingdom
Prior art keywords
signal
buck
light source
boost converter
current
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Withdrawn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
GBGB1300495.7A
Other versions
GB2497213A (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 US13/535,561 external-priority patent/US20120268023A1/en
Application filed by O2Micro Inc filed Critical O2Micro Inc
Publication of GB201300495D0 publication Critical patent/GB201300495D0/en
Publication of GB2497213A publication Critical patent/GB2497213A/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Withdrawn legal-status Critical Current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]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • 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
    • H05B45/355—Power factor correction [PFC]; Reactive power compensation
    • 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]

Abstract

A driving circuit 1400 for driving a light-emitting diode (LED) light source 208 includes a buck-boost converter 1406 and a controller 1410. The buck-boost converter receives an input voltage and an input current and powers the LED light source, and comprises a switch 1416 controlled by a driving signal PWM1. The controller receives a first signal IAVG indicating a current through the LED light source, and generates the driving signal based on the first signal to control the switch and to adjust the current through the LED light source. The buck-boost converter further comprises a current sensor 1418 which provides a second signal ISEN indicating an instant current flowing through the buck-boost converter, wherein the first signal is derived from the second signal, and wherein a reference ground of the controller is different from a ground of the driving circuit.
GB1300495.7A 2012-06-28 2013-01-11 Circuits and methods for driving light sources Withdrawn GB2497213A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US13/535,561 US20120268023A1 (en) 2010-03-04 2012-06-28 Circuits and methods for driving light sources

Publications (2)

Publication Number Publication Date
GB201300495D0 true GB201300495D0 (en) 2013-02-27
GB2497213A GB2497213A (en) 2013-06-05

Family

ID=47757846

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1300495.7A Withdrawn GB2497213A (en) 2012-06-28 2013-01-11 Circuits and methods for driving light sources

Country Status (3)

Country Link
CN (1) CN103260301B (en)
GB (1) GB2497213A (en)
TW (1) TWI556679B (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWM452547U (en) * 2012-07-27 2013-05-01 Excelliance Mos Corp Voltage converting apparatus
US9118249B2 (en) 2012-07-27 2015-08-25 Excelliance Mos Corporation Power conversion apparatus
TWI481311B (en) * 2014-02-24 2015-04-11 Lextar Electronics Corp Led driver
CN103957620A (en) * 2014-04-28 2014-07-30 四川虹视显示技术有限公司 Driving method and power source for bipolar OLED illumination
CN105792471A (en) * 2014-12-26 2016-07-20 凹凸电子（武汉）有限公司 Light source driving circuit, controller and control method
CN106163037B (en) * 2015-04-17 2019-12-20 朗德万斯公司 Light emitting diode driving circuit and light emitting diode lighting apparatus
EP3276808B1 (en) * 2016-07-26 2018-12-26 NXP USA, Inc. Accurate non-isolated high voltage dc-dc feedback
CN113518489A (en) * 2020-04-10 2021-10-19 凹凸电子（武汉）有限公司 Controller, light source driving system and light source driving method

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW201007413A (en) * 2008-08-15 2010-02-16 Novatek Microelectronics Corp Power conversion system and power conversion method thereof
CN201491339U (en) * 2009-08-20 2010-05-26 浙江光益光能科技有限公司 LED driving circuit
CN102523661B (en) * 2011-12-29 2015-07-08 凹凸电子（武汉）有限公司 Circuit for driving LED light source, method and controller
US20120146532A1 (en) * 2010-12-09 2012-06-14 Altair Engineering, Inc. Current regulator circuit for led light
CN201967208U (en) * 2011-01-26 2011-09-07 深圳茂硕电源科技股份有限公司 Multichannel constant-current source circuit that the high efficiency is simple
CN202050564U (en) * 2011-02-17 2011-11-23 昂宝电子（上海）有限公司 Dimmable LED (Light-emitting Diode) drive circuit
CN102821509A (en) * 2011-06-08 2012-12-12 聚积科技股份有限公司 AC/DC dual-purpose LED drive circuit
CN102523650B (en) * 2011-12-02 2014-04-02 蒋晓博 Light-emitting diode (LED) current detection and control circuit

Also Published As

Publication number Publication date
TWI556679B (en) 2016-11-01
CN103260301A (en) 2013-08-21
GB2497213A (en) 2013-06-05
TW201401923A (en) 2014-01-01
CN103260301B (en) 2014-08-27

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)