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GB878922A - Improvements in or relating to protective circuit arrangements - Google Patents

Improvements in or relating to protective circuit arrangements

Info

Publication number
GB878922A
GB878922A GB3801158A GB3801158A GB878922A GB 878922 A GB878922 A GB 878922A GB 3801158 A GB3801158 A GB 3801158A GB 3801158 A GB3801158 A GB 3801158A GB 878922 A GB878922 A GB 878922A
Authority
GB
United Kingdom
Prior art keywords
transistor
relating
voltage
protective circuit
circuit arrangements
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
GB3801158A
Inventor
William Townsend Eastwood
Edwin Stanley Cheng
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.)
Marconis Wireless Telegraph Co Ltd
BAE Systems Electronics Ltd
Original Assignee
Marconis Wireless Telegraph Co Ltd
Marconi 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 Marconis Wireless Telegraph Co Ltd, Marconi Co Ltd filed Critical Marconis Wireless Telegraph Co Ltd
Priority to GB3801158A priority Critical patent/GB878922A/en
Publication of GB878922A publication Critical patent/GB878922A/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 
    • G05F1/46—Regulating voltage or current  wherein the variable actually regulated by the final control device is DC
    • G05F1/56—Regulating voltage or current  wherein the variable actually regulated by the final control device is DC using semiconductor devices in series with the load as final control devices
    • G05F1/565—Regulating voltage or current  wherein the variable actually regulated by the final control device is DC using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor
    • G05F1/569—Regulating voltage or current  wherein the variable actually regulated by the final control device is DC using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for protection
    • G05F1/571—Regulating voltage or current  wherein the variable actually regulated by the final control device is DC using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for protection with overvoltage detector

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Amplifiers (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

878,922. Protective arrangements; automatic voltage regulation. MARCONI'S WIRELESS TELEGRAPH CO. Ltd. Aug. 24, 1959 [Nov. 25, 1958], No. 38011/58. Class 38 (4). A protective arrangement for a D.C. load 3, 4, subjected to high-voltage transients from a supply 1, 2 comprises a transistor 5 connected to impedances Z 1 -Z 3 , as shown, and controlled by a voltage regulating transistor 6 having its base connected to a biasing circuit comprising a D.C. source 8 and resistor 7. Normal voltage variations vary the impedance of transistor 5 through transistor 6, but transients are passed directly to transistor 6, thus tending to cut it off.
GB3801158A 1958-11-25 1958-11-25 Improvements in or relating to protective circuit arrangements Expired GB878922A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3801158A GB878922A (en) 1958-11-25 1958-11-25 Improvements in or relating to protective circuit arrangements

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3801158A GB878922A (en) 1958-11-25 1958-11-25 Improvements in or relating to protective circuit arrangements

Publications (1)

Publication Number Publication Date
GB878922A true GB878922A (en) 1961-10-04

Family

ID=10400571

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3801158A Expired GB878922A (en) 1958-11-25 1958-11-25 Improvements in or relating to protective circuit arrangements

Country Status (1)

Country Link
GB (1) GB878922A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1777645A3 (en) * 2005-10-12 2011-08-24 Semiconductor Energy Laboratory Co., Ltd. Semiconductor device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1777645A3 (en) * 2005-10-12 2011-08-24 Semiconductor Energy Laboratory Co., Ltd. Semiconductor device

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