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GB1275749A - Electrical circuits for controlling a current through a load - Google Patents

Electrical circuits for controlling a current through a load

Info

Publication number
GB1275749A
GB1275749A GB3048868A GB3048868A GB1275749A GB 1275749 A GB1275749 A GB 1275749A GB 3048868 A GB3048868 A GB 3048868A GB 3048868 A GB3048868 A GB 3048868A GB 1275749 A GB1275749 A GB 1275749A
Authority
GB
United Kingdom
Prior art keywords
capacitor
current
load
charge
halfcycle
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
GB3048868A
Inventor
Benjamin Keith Finnimore
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
Priority to GB3048868A priority Critical patent/GB1275749A/en
Publication of GB1275749A publication Critical patent/GB1275749A/en
Expired legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05FSYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00Automatic 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
    • G05F1/10Regulating voltage or current
    • G05F1/12Regulating voltage or current wherein the variable actually regulated by the final control device is ac
    • G05F1/40Regulating voltage or current wherein the variable actually regulated by the final control device is ac using discharge tubes or semiconductor devices as final control devices
    • G05F1/44Regulating voltage or current wherein the variable actually regulated by the final control device is ac using discharge tubes or semiconductor devices as final control devices semiconductor devices only
    • G05F1/45Regulating voltage or current wherein the variable actually regulated by the final control device is ac using discharge tubes or semiconductor devices as final control devices semiconductor devices only being controlled rectifiers in series with the load
    • G05F1/455Regulating voltage or current wherein the variable actually regulated by the final control device is ac using discharge tubes or semiconductor devices as final control devices semiconductor devices only being controlled rectifiers in series with the load with phase control
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B39/00Circuit arrangements or apparatus for operating incandescent light sources
    • H05B39/04Controlling
    • H05B39/08Controlling by shifting phase of trigger voltage applied to gas-filled controlling tubes also in controlled semiconductor devices
    • H05B39/083Controlling by shifting phase of trigger voltage applied to gas-filled controlling tubes also in controlled semiconductor devices by the variation-rate of light intensity

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Control Of Electrical Variables (AREA)

Abstract

1275749 Switching circuits for consuming devices B K FINNIMORE 26 June 1969 [26 June 1968] 30488/68 Heading H2H The current in a load is controlled by varying the firing angle of a controllable rectifier in dependence or the state of charge of two capacitors. In the circuit of Fig. 1, closure of a switch 13 initiates a slow build-up of charge on a capacitor 18. A transistor 21 becomes conductive and another capacitor 23 charges rapidly until a voltage sufficient to trigger the thyristor 14 is reached. The load 10 now draws a greatly increased current for the remainder of the halfcycle, a too rapid rise in current being prevented by a filter circuit 26, 27. In a subsequent halfcycle, the charge on the capacitor 18 will be higher, so that current can flow more rapidly into the capacitor 23 and the load will be fully energized for a greater part of the half-cycle. Hence, the average current in the load, which may be a lamp, builds up gradually to a maximum when the capacitor 18 is fully charged. The resistor 19 may be varied to change the rate of increase. A shorting switch may be connected across the capacitor 18 to allow the lamp to be dimmed. In modifications, the thyristor 14 may be replaced by a pair of anti-parallel thyristors or by a triac triggered by a diac.
GB3048868A 1968-06-26 1968-06-26 Electrical circuits for controlling a current through a load Expired GB1275749A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3048868A GB1275749A (en) 1968-06-26 1968-06-26 Electrical circuits for controlling a current through a load

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3048868A GB1275749A (en) 1968-06-26 1968-06-26 Electrical circuits for controlling a current through a load

Publications (1)

Publication Number Publication Date
GB1275749A true GB1275749A (en) 1972-05-24

Family

ID=10308464

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3048868A Expired GB1275749A (en) 1968-06-26 1968-06-26 Electrical circuits for controlling a current through a load

Country Status (1)

Country Link
GB (1) GB1275749A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4359681A (en) * 1980-05-01 1982-11-16 Westinghouse Electric Corp. Alternating current power controller with DC transistor switching and an internal DC power supply
GB2160723A (en) * 1984-06-01 1985-12-24 Hayashibara Ken Surge current suppressing adapter for an incandescent lamp
US4705963A (en) * 1984-09-18 1987-11-10 Smiths Industries Public Limited Company AC controlled diode switch
WO1998024181A1 (en) * 1996-11-25 1998-06-04 Beacon Light Products, Inc. Smooth switching module
GB2323724A (en) * 1997-03-26 1998-09-30 David Esmond Holland Electrical switching arrangement giving slow turn-on
US5861720A (en) * 1996-11-25 1999-01-19 Beacon Light Products, Inc. Smooth switching power control circuit and method

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4359681A (en) * 1980-05-01 1982-11-16 Westinghouse Electric Corp. Alternating current power controller with DC transistor switching and an internal DC power supply
GB2160723A (en) * 1984-06-01 1985-12-24 Hayashibara Ken Surge current suppressing adapter for an incandescent lamp
US4705963A (en) * 1984-09-18 1987-11-10 Smiths Industries Public Limited Company AC controlled diode switch
WO1998024181A1 (en) * 1996-11-25 1998-06-04 Beacon Light Products, Inc. Smooth switching module
US5861720A (en) * 1996-11-25 1999-01-19 Beacon Light Products, Inc. Smooth switching power control circuit and method
US5861721A (en) * 1996-11-25 1999-01-19 Beacon Light Products, Inc. Smooth switching module
GB2323724A (en) * 1997-03-26 1998-09-30 David Esmond Holland Electrical switching arrangement giving slow turn-on

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees