WO2005027324A3 - Split phase inverters for ccfl backlight system - Google Patents

Split phase inverters for ccfl backlight system Download PDF

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Publication number
WO2005027324A3
WO2005027324A3 PCT/US2004/028210 US2004028210W WO2005027324A3 WO 2005027324 A3 WO2005027324 A3 WO 2005027324A3 US 2004028210 W US2004028210 W US 2004028210W WO 2005027324 A3 WO2005027324 A3 WO 2005027324A3
Authority
WO
WIPO (PCT)
Prior art keywords
inverter
lamp structure
controller
backlight system
phase inverters
Prior art date
Application number
PCT/US2004/028210
Other languages
French (fr)
Other versions
WO2005027324A2 (en
Inventor
Xiaoping Jin
Original Assignee
Microsemi Corp
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 Microsemi Corp filed Critical Microsemi Corp
Publication of WO2005027324A2 publication Critical patent/WO2005027324A2/en
Publication of WO2005027324A3 publication Critical patent/WO2005027324A3/en

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
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/36—Controlling
    • H05B41/38—Controlling the intensity of light
    • H05B41/39—Controlling the intensity of light continuously
    • H05B41/392—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor
    • H05B41/3921—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations
    • H05B41/3927—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations by pulse width modulation
    • 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
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
    • H05B41/282—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices
    • H05B41/2825—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices by means of a bridge converter in the final stage
    • H05B41/2828—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices by means of a bridge converter in the final stage using control circuits for the switching elements
    • 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

Abstract

An apparatus and method for driving a lamp structure (301) are provided. In one embodiment, an inverter having four switching elements is split into two inverter arms (302), (304) that are deployed at separate terminals (312), (314) of the lamp structure (301) to achieve even light output. A controller (306) drives both inverter arms (302), (304) such that power switching lines do not cross the lamp structure (301). In one embodiment, the controller (306) adjusts the brightness of the lamp structure (301) by adjusting the phase difference between outputs of the first inverter arm (302) relative to the second inverter arm (304). In one embodiment, the controller (306) adjusts the brightness by symmetrically pulse width modulating the outputs of the first inverter arm (302) and the second inverter arm (304).
PCT/US2004/028210 2003-09-09 2004-08-30 Split phase inverters for ccfl backlight system WO2005027324A2 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US50150203P 2003-09-09 2003-09-09
US60/501,502 2003-09-09
US10/903,636 2004-07-30
US10/903,636 US7187139B2 (en) 2003-09-09 2004-07-30 Split phase inverters for CCFL backlight system

Publications (2)

Publication Number Publication Date
WO2005027324A2 WO2005027324A2 (en) 2005-03-24
WO2005027324A3 true WO2005027324A3 (en) 2007-03-22

Family

ID=34316488

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2004/028210 WO2005027324A2 (en) 2003-09-09 2004-08-30 Split phase inverters for ccfl backlight system

Country Status (3)

Country Link
US (3) US7187139B2 (en)
TW (1) TWI281575B (en)
WO (1) WO2005027324A2 (en)

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TWI281575B (en) 2007-05-21
US7952298B2 (en) 2011-05-31
US20090206767A1 (en) 2009-08-20
WO2005027324A2 (en) 2005-03-24
US20050062436A1 (en) 2005-03-24
US7525255B2 (en) 2009-04-28
US7187139B2 (en) 2007-03-06
TW200510875A (en) 2005-03-16

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