WO2001015202A3 - Method of and system for closed loop control of fluorescent lamps - Google Patents

Method of and system for closed loop control of fluorescent lamps Download PDF

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Publication number
WO2001015202A3
WO2001015202A3 PCT/US2000/022940 US0022940W WO0115202A3 WO 2001015202 A3 WO2001015202 A3 WO 2001015202A3 US 0022940 W US0022940 W US 0022940W WO 0115202 A3 WO0115202 A3 WO 0115202A3
Authority
WO
WIPO (PCT)
Prior art keywords
lamp
intensity
wavelength
lamps
closed loop
Prior art date
Application number
PCT/US2000/022940
Other languages
French (fr)
Other versions
WO2001015202A2 (en
Inventor
Terry Harris
Original Assignee
Bausch & Lomb
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 Bausch & Lomb filed Critical Bausch & Lomb
Priority to AU67940/00A priority Critical patent/AU6794000A/en
Publication of WO2001015202A2 publication Critical patent/WO2001015202A2/en
Publication of WO2001015202A3 publication Critical patent/WO2001015202A3/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
    • H05B41/3922—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations and measurement of the incident 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
    • 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
    • H05B41/3924—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations by phase control, e.g. using a triac

Abstract

A closed loop control scheme regulates the lamp intensity of a PL-S lamp at one wavelength by sensing light output by the lamp at another wavelength and controlling lamp power through AC phase modulation. Preferably, the scheme regulates lamp intensity in response to sensed light emitted by the lamp. This scheme provides compensation for lamp and ballast manufacturing variability, temperature effects, line voltage fluctuations, and lamp aging. The controller can set the intensity of a number of banks of lamps, and any lamp can be assigned to any bank. Once set sensing a visible light wavelength and controlling a UV wavelength, the variability of UV light intensity is controlled to within (±40 νW/cm2 at a 12,000 νW/cm2 level (measured substantially at the lamp), representing a 33 % error; and the need to measure the intensity of the process occurs only at regular PMS intervals. The controller monitors and reports lamp failure and near end of lamp life. Soft start circuitry eliminates on/off cycling stresses and cycling lamps on only when needed yields increased lamp useful life. Further, the system reduces typically long warm-up periods experienced in the prior art to a few minutes.
PCT/US2000/022940 1999-08-23 2000-08-21 Method of and system for closed loop control of fluorescent lamps WO2001015202A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU67940/00A AU6794000A (en) 1999-08-23 2000-08-21 Method of and system for closed loop control of fluorescent lamps

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US58584499P 1999-08-23 1999-08-23
US60/585,844 2004-07-08

Publications (2)

Publication Number Publication Date
WO2001015202A2 WO2001015202A2 (en) 2001-03-01
WO2001015202A3 true WO2001015202A3 (en) 2001-10-04

Family

ID=24343200

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2000/022940 WO2001015202A2 (en) 1999-08-23 2000-08-21 Method of and system for closed loop control of fluorescent lamps

Country Status (2)

Country Link
AU (1) AU6794000A (en)
WO (1) WO2001015202A2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005006820A1 (en) * 2003-06-13 2005-01-20 Ictel, Llc Electronic ballast
DE202005015058U1 (en) * 2005-09-23 2005-12-08 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Lamp brightness sensor has fixed gain operational amplifier with D/A driven current supply to photodetector connected input terminal
DE102006054356A1 (en) * 2006-11-17 2008-05-21 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Low-pressure discharge lamp and method for operating a low-pressure discharge lamp

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4032817A (en) * 1974-12-12 1977-06-28 Harris Corporation Wide range power control for electric discharge lamp and press using the same
US4346331A (en) * 1980-05-27 1982-08-24 Enertron, Inc. Feedback control system for applying AC power to ballasted lamps
US4642526A (en) * 1984-09-14 1987-02-10 Angstrom Robotics & Technologies, Inc. Fluorescent object recognition system having self-modulated light source
EP0508526A1 (en) * 1991-04-10 1992-10-14 Koninklijke Philips Electronics N.V. Circuit arrangement
EP0563716A1 (en) * 1992-03-30 1993-10-06 Otto Diez Elektromaschinenbau Device with UV-lamp
WO1994014301A1 (en) * 1992-12-10 1994-06-23 Intelliswitch, Inc. Automatic light dimmer for gas discharge lamps
US5414325A (en) * 1994-04-13 1995-05-09 General Electric Company Gas discharge lamp ballast circuit with automatically calibrated light feedback control
US5598042A (en) * 1993-09-22 1997-01-28 The Watt Stopper Moveable desktop load controller
US5726534A (en) * 1995-06-05 1998-03-10 Samsung Electronics Co., Ltd. Preheat current control circuit based upon the number of lamps detected
US5786801A (en) * 1996-09-06 1998-07-28 Sony Corporation Back light control apparatus and method for a flat display system

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4032817A (en) * 1974-12-12 1977-06-28 Harris Corporation Wide range power control for electric discharge lamp and press using the same
US4346331A (en) * 1980-05-27 1982-08-24 Enertron, Inc. Feedback control system for applying AC power to ballasted lamps
US4642526A (en) * 1984-09-14 1987-02-10 Angstrom Robotics & Technologies, Inc. Fluorescent object recognition system having self-modulated light source
EP0508526A1 (en) * 1991-04-10 1992-10-14 Koninklijke Philips Electronics N.V. Circuit arrangement
EP0563716A1 (en) * 1992-03-30 1993-10-06 Otto Diez Elektromaschinenbau Device with UV-lamp
WO1994014301A1 (en) * 1992-12-10 1994-06-23 Intelliswitch, Inc. Automatic light dimmer for gas discharge lamps
US5598042A (en) * 1993-09-22 1997-01-28 The Watt Stopper Moveable desktop load controller
US5414325A (en) * 1994-04-13 1995-05-09 General Electric Company Gas discharge lamp ballast circuit with automatically calibrated light feedback control
US5726534A (en) * 1995-06-05 1998-03-10 Samsung Electronics Co., Ltd. Preheat current control circuit based upon the number of lamps detected
US5786801A (en) * 1996-09-06 1998-07-28 Sony Corporation Back light control apparatus and method for a flat display system

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
"fluorescent lamps size guide", XP002152995, Retrieved from the Internet <URL:www.cisco.com/size/fllamp.htm> [retrieved on 20001115] *
"FLUORESCENT LAMPS", PHILIPS PRODUCT SPECIFICATION, XX, XX, 1 January 1900 (1900-01-01), XX, pages 01, XP002152994 *
"FLUORESCENT LAMPS", PHILIPS PRODUCT SPECIFICATION, XX, XX, 1 January 1900 (1900-01-01), XX, pages 01, XP002153100 *

Also Published As

Publication number Publication date
WO2001015202A2 (en) 2001-03-01
AU6794000A (en) 2001-03-19

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