GB994425A - Improvements in or relating to current regulating circuits - Google Patents

Improvements in or relating to current regulating circuits

Info

Publication number
GB994425A
GB994425A GB9464/61A GB946461A GB994425A GB 994425 A GB994425 A GB 994425A GB 9464/61 A GB9464/61 A GB 9464/61A GB 946461 A GB946461 A GB 946461A GB 994425 A GB994425 A GB 994425A
Authority
GB
United Kingdom
Prior art keywords
transistor
lamp
current
ripple
rectifier
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.)
Expired
Application number
GB9464/61A
Inventor
John Rodger Dyke
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.)
International Computers and Tabulators Ltd
Original Assignee
International Computers and Tabulators Ltd
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 International Computers and Tabulators Ltd filed Critical International Computers and Tabulators Ltd
Priority to GB9464/61A priority Critical patent/GB994425A/en
Priority to US179408A priority patent/US3210647A/en
Publication of GB994425A publication Critical patent/GB994425A/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
    • H05B39/00—Circuit arrangements or apparatus for operating incandescent light sources
    • H05B39/04—Controlling
    • H05B39/041—Controlling the light-intensity of the source
    • H05B39/042—Controlling the light-intensity of the source by measuring the incident light
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current 
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

994,425. Automatic light intensity control. INTERNATIONAL COMPUTERS & TABULATORS Ltd. Feb. 22, 1962 [March 15, 1961], No.9464/61. Heading G3R. A lamp 1 is supplied with unsmoothed direct current from a rectifier 2, the lmap current being controlled by a series resistor 4 which may be short-circuited by a transistor T1. Light from the lamp 1 falls on a photo-voltaic cell 5 the output of which is applied to a transistor T2 together with an adjustable reference current obtained from an auxiliary supply 10, through Zener diode 6 and resistors 7, 8. This is arranged so that normally the ripple content of the photo-cell output causes the transistor T2 to conduct intermittently. This, through the intermediary of a transistor amplifier 17 causes transistor T1 to conduct for short periods at ripple frequency, but out of phase with the original ripple from rectifier 2 due to the time constant of the lamp 1. Changes in light intensity produce compensating changes in the length of time for which transistor T1 is conductive. It is stated that if the load is not a lamp, the current can be measured by a series resistor, and that the transistor T1 may be in shunt instead of in series with the load.
GB9464/61A 1961-03-15 1961-03-15 Improvements in or relating to current regulating circuits Expired GB994425A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB9464/61A GB994425A (en) 1961-03-15 1961-03-15 Improvements in or relating to current regulating circuits
US179408A US3210647A (en) 1961-03-15 1962-03-13 Current regulating circuits employing light sensitive means and pulse width modulation control

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9464/61A GB994425A (en) 1961-03-15 1961-03-15 Improvements in or relating to current regulating circuits

Publications (1)

Publication Number Publication Date
GB994425A true GB994425A (en) 1965-06-10

Family

ID=9872477

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9464/61A Expired GB994425A (en) 1961-03-15 1961-03-15 Improvements in or relating to current regulating circuits

Country Status (2)

Country Link
US (1) US3210647A (en)
GB (1) GB994425A (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3311813A (en) * 1962-12-20 1967-03-28 Guildline Instr Ltd Photosensitive device controlled voltage-current regulating systems
US3349319A (en) * 1967-01-03 1967-10-24 Aiken William Ross Arrangement for varying the resistance value of photo-sensitive devices
US4302717A (en) * 1980-02-04 1981-11-24 Fairchild Camera And Instrument Corp. Power supply with increased dynamic range
US4423478A (en) * 1981-07-20 1983-12-27 Xerox Corporation Phase controlled regulated power supply
US5691628A (en) * 1995-03-21 1997-11-25 Rochester Instrument Systems, Inc. Regulation of current or voltage with PWM controller

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE553766A (en) * 1955-12-29
CA613805A (en) * 1958-03-20 1961-01-31 Westinghouse Electric Corporation Regulator system for dynamoelectric machine
US3168693A (en) * 1958-12-29 1965-02-02 Bendix Corp Transistorized voltage regulator
US2996653A (en) * 1960-01-18 1961-08-15 Westinghouse Electric Corp Electrical control apparatus

Also Published As

Publication number Publication date
US3210647A (en) 1965-10-05

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