GB1241295A - Improvements in or relating to electronic switching circuits - Google Patents

Improvements in or relating to electronic switching circuits

Info

Publication number
GB1241295A
GB1241295A GB51634/67A GB5163467A GB1241295A GB 1241295 A GB1241295 A GB 1241295A GB 51634/67 A GB51634/67 A GB 51634/67A GB 5163467 A GB5163467 A GB 5163467A GB 1241295 A GB1241295 A GB 1241295A
Authority
GB
United Kingdom
Prior art keywords
load
pulse
thermistor
impedance
voltage
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
GB51634/67A
Inventor
Thomas Michael Pletts
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.)
Plessey Co Ltd
Original Assignee
Plessey Co 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 Plessey Co Ltd filed Critical Plessey Co Ltd
Priority to GB51634/67A priority Critical patent/GB1241295A/en
Publication of GB1241295A publication Critical patent/GB1241295A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • G05F1/12—Regulating voltage or current wherein the variable actually regulated by the final control device is ac
    • G05F1/40—Regulating 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
    • G05F1/44—Regulating 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
    • G05F1/45—Regulating 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
    • G05F1/455—Regulating 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
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/1906—Control of temperature characterised by the use of electric means using an analogue comparing device
    • G05D23/1909—Control of temperature characterised by the use of electric means using an analogue comparing device whose output amplitude can only take two discrete values
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
    • G05D23/24—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element having a resistance varying with temperature, e.g. a thermistor
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
    • H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
    • H03K17/72—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices having more than two PN junctions; having more than three electrodes; having more than one electrode connected to the same conductivity region

Landscapes

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

Abstract

1,241,295. Automatic power control. PLESSEY CO. Ltd. Oct.25, 1968 [Nov. 13, 1967], No. 51634/67. Heading G3R. The power dissipated by an A.C. load 12 is controlled by an arrangement including pulse producing means, e.g. a saturable reactor 1, which produces pulses at the start and finish of each half-cycle of an alternating current supplied to the load 12 through a uni-directional switch, e.g. a thyristor 10; each pulse is dropped across the series combination of a reference impedance, e.g. a fixed resistor 7, and a variable detector impedance, e.g. a thermistor 8, responsive to the power dissipated in the load, the voltage at the junction 9 between impedances 7, 8 being effective for triggering the switch 10. The pulse-producing windings 5, 6 of the saturable reactor 1 are connected in a bridge circuit with the impedances 7 and 8 so that the voltage at 9 is zero when the thermistor 8 is at the correct temperature ccrresponding to the desired load dissipation. Should the load dissipation vary, the impedance of thermistor 8 will vary accordingly and the resultant voltage pulse at 9 will control the firing of thyristor 10 to correct the deviation.
GB51634/67A 1967-11-13 1967-11-13 Improvements in or relating to electronic switching circuits Expired GB1241295A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB51634/67A GB1241295A (en) 1967-11-13 1967-11-13 Improvements in or relating to electronic switching circuits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB51634/67A GB1241295A (en) 1967-11-13 1967-11-13 Improvements in or relating to electronic switching circuits

Publications (1)

Publication Number Publication Date
GB1241295A true GB1241295A (en) 1971-08-04

Family

ID=10460803

Family Applications (1)

Application Number Title Priority Date Filing Date
GB51634/67A Expired GB1241295A (en) 1967-11-13 1967-11-13 Improvements in or relating to electronic switching circuits

Country Status (1)

Country Link
GB (1) GB1241295A (en)

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