GB2007880A - Energy conserving automatic light output system - Google Patents

Energy conserving automatic light output system

Info

Publication number
GB2007880A
GB2007880A GB7828110A GB7828110A GB2007880A GB 2007880 A GB2007880 A GB 2007880A GB 7828110 A GB7828110 A GB 7828110A GB 7828110 A GB7828110 A GB 7828110A GB 2007880 A GB2007880 A GB 2007880A
Authority
GB
United Kingdom
Prior art keywords
ballast
transistor
current
light
lamps
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
GB7828110A
Other versions
GB2007880B (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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB2007880A publication Critical patent/GB2007880A/en
Application granted granted Critical
Publication of GB2007880B publication Critical patent/GB2007880B/en
Expired 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
    • H05B41/3922—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
    • H05B41/40—Controlling the intensity of light discontinuously
    • H05B41/42—Controlling the intensity of light discontinuously in two steps only

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)
  • Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)

Abstract

An energy conserving lighting system is provided wherein a plurality of fluorescent lamps are powered by a poorly regulated voltage supply which provides a decreasing supply voltage with increasing arc current so as to generally match the volt-ampere characteristics of the lamps. A transistor ballast and control circuit connected in the arc current path controls the arc current and hence the light output in accordance with the total ambient light, i.e., the light produced by the lamps together with whatever further light is produced by other sources such as daylight. In another embodiment, a transistor ballast is utilized in combination with an inductive ballast. The transistor ballast provides current control over a wide dynamic range up to a design current maximum at which maximum the transistor is saturated and the inductive ballast takes over the current limiting function. <IMAGE>
GB7828110A 1977-11-07 1978-06-28 Energy conserving automatic light output system Expired GB2007880B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US84942777A 1977-11-07 1977-11-07

Publications (2)

Publication Number Publication Date
GB2007880A true GB2007880A (en) 1979-05-23
GB2007880B GB2007880B (en) 1982-09-08

Family

ID=25305752

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7828110A Expired GB2007880B (en) 1977-11-07 1978-06-28 Energy conserving automatic light output system

Country Status (9)

Country Link
JP (1) JPS5466572A (en)
AU (1) AU527509B2 (en)
CA (1) CA1128604A (en)
DE (1) DE2848018A1 (en)
FR (1) FR2408273A1 (en)
GB (1) GB2007880B (en)
MX (1) MX147049A (en)
NL (1) NL7807659A (en)
SE (1) SE7807725L (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0020493A1 (en) * 1978-09-26 1981-01-07 Controlled Environment Syst Fluorescent lamp lighting system.

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0017615A1 (en) * 1979-03-14 1980-10-15 Peter Jucker Circuit for varying the light intensity of fluorescent lamps and its use
GB2145587B (en) * 1983-08-25 1987-06-10 Lutron Electronics Co Gas discharging lamp dimming system
DE3524681A1 (en) * 1985-07-11 1987-01-22 Trilux Lenze Gmbh & Co Kg DIMMER SWITCH FOR AN ELECTRONIC FLUORESCENT LAMP CONTROLLER
DE3633566A1 (en) * 1986-10-02 1988-04-21 Guenter Steinbach Circuit arrangement for regulated high-energy pulse generation for gas-discharge flash lamps

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1366032A (en) * 1963-05-03 1964-07-10 Thomson Houston Comp Francaise Device for the operation of electric discharge devices
JPS4219891Y1 (en) * 1964-12-29 1967-11-17
US3422310A (en) * 1965-06-14 1969-01-14 Don F Widmayer Apparatus for controlling current to load independent of load characteristics
FR1483350A (en) * 1966-06-14 1967-06-02 Device for adjusting an electric current, in particular that supplied to a gas discharge lamp
CH481550A (en) * 1967-12-21 1969-11-15 Frako Kondensatoren Und App Ba Circuit arrangement with a gas discharge lamp
US3603841A (en) * 1968-03-01 1971-09-07 Matsushita Electronics Corp Fluorescent lamp device with luminosity control
US3909666A (en) * 1973-12-26 1975-09-30 Stanley N Tenen Ballast circuit for gaseous discharge lamps
DE2646621A1 (en) * 1976-10-15 1978-04-20 Penguin Marketing Ltd Gas discharge lamps ballast circuit - is for two lamps in series and has two RC voltage doublers and voltage regulating transistor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0020493A1 (en) * 1978-09-26 1981-01-07 Controlled Environment Syst Fluorescent lamp lighting system.
EP0020493A4 (en) * 1978-09-26 1982-04-22 Controlled Environment Syst Fluorescent lamp lighting system.

Also Published As

Publication number Publication date
FR2408273B1 (en) 1984-09-14
AU3723878A (en) 1980-01-03
SE7807725L (en) 1979-05-08
DE2848018A1 (en) 1979-05-10
GB2007880B (en) 1982-09-08
CA1128604A (en) 1982-07-27
MX147049A (en) 1982-09-27
NL7807659A (en) 1979-05-09
FR2408273A1 (en) 1979-06-01
JPS5466572A (en) 1979-05-29
AU527509B2 (en) 1983-03-10

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Legal Events

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