CA2032058A1 - Circuit for dimming gas discharge lamps without introducing striations - Google Patents

Circuit for dimming gas discharge lamps without introducing striations

Info

Publication number
CA2032058A1
CA2032058A1 CA2032058A CA2032058A CA2032058A1 CA 2032058 A1 CA2032058 A1 CA 2032058A1 CA 2032058 A CA2032058 A CA 2032058A CA 2032058 A CA2032058 A CA 2032058A CA 2032058 A1 CA2032058 A1 CA 2032058A1
Authority
CA
Canada
Prior art keywords
circuit
lamp
gas discharge
striations
introducing
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
CA2032058A
Other languages
French (fr)
Other versions
CA2032058C (en
Inventor
Charles R. Sullivan
Scott R. Jurell
David G. Luchaco
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.)
Lutron Electronics Co Inc
Original Assignee
Lutron Electronics Co 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
Application filed by Lutron Electronics Co Inc filed Critical Lutron Electronics Co Inc
Publication of CA2032058A1 publication Critical patent/CA2032058A1/en
Application granted granted Critical
Publication of CA2032058C publication Critical patent/CA2032058C/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • H05B41/285—Arrangements for protecting lamps or circuits against abnormal operating conditions
    • H05B41/2858—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the lamp against abnormal operating conditions
    • 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
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S315/00—Electric lamp and discharge devices: systems
    • Y10S315/04—Dimming circuit for fluorescent lamps

Abstract

A control system for providing electrical power from a source to a gas discharge lamp. The system com-prises a circuit for providing symmetrical ac current to the electrodes of the lamp to strike and maintain an electric discharge through the lamp, and a circuit for simultaneously providing dc current to the lamp electrodes.
An asymmetric current waveform is established in the lamp which substantially eliminates the occurrence of visible striations.
CA002032058A 1989-12-22 1990-12-12 Circuit for dimming gas discharge lamps without introducing striations Expired - Lifetime CA2032058C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US455,644 1989-12-22
US07455644 US5001386B1 (en) 1989-12-22 1989-12-22 Circuit for dimming gas discharge lamps without introducing striations

Publications (2)

Publication Number Publication Date
CA2032058A1 true CA2032058A1 (en) 1991-06-23
CA2032058C CA2032058C (en) 2000-04-18

Family

ID=23809669

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002032058A Expired - Lifetime CA2032058C (en) 1989-12-22 1990-12-12 Circuit for dimming gas discharge lamps without introducing striations

Country Status (5)

Country Link
US (1) US5001386B1 (en)
JP (1) JP2892509B2 (en)
CA (1) CA2032058C (en)
DE (1) DE4039497A1 (en)
GB (1) GB2239568B (en)

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Also Published As

Publication number Publication date
US5001386B1 (en) 1996-10-15
GB2239568B (en) 1994-06-08
CA2032058C (en) 2000-04-18
GB9026930D0 (en) 1991-01-30
GB2239568A (en) 1991-07-03
DE4039497A1 (en) 1991-06-27
JP2892509B2 (en) 1999-05-17
JPH04112494A (en) 1992-04-14
US5001386A (en) 1991-03-19

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