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GB1292128A - Electronic current control system - Google Patents

Electronic current control system

Info

Publication number
GB1292128A
GB1292128A GB6211469A GB6211469A GB1292128A GB 1292128 A GB1292128 A GB 1292128A GB 6211469 A GB6211469 A GB 6211469A GB 6211469 A GB6211469 A GB 6211469A GB 1292128 A GB1292128 A GB 1292128A
Authority
GB
United Kingdom
Prior art keywords
transistor
conduct
dec
low resistance
conductive
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
GB6211469A
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.)
Alcatel CIT SA
Nokia Inc
Original Assignee
Compagnie Industrielle de Telecommunication CIT Alcatel SA
Nokia Inc
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 Compagnie Industrielle de Telecommunication CIT Alcatel SA, Nokia Inc filed Critical Compagnie Industrielle de Telecommunication CIT Alcatel SA
Publication of GB1292128A publication Critical patent/GB1292128A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
    • H03K17/082—Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit
    • H03K17/0826—Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit in bipolar transistor switches
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
    • H02H11/005—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of too low isolation resistance, too high load, short-circuit; earth fault
    • 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
    • H03K17/60—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 the devices being bipolar transistors

Landscapes

  • Electronic Switches (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

1292128 Protective arrangements COMPAGNIE INDUSTRIELLE DES TELECOMMUNICATIONS CIT-ALCATEL 19 Dec 1969 [23 Dec 1968] 62114/69 Heading H2K An arrangement for controlling the supply to an electronic apparatus S and preventing the completion of the supply circuit to the apparatus when the apparatus is short-circuited or has a low resistance fault, comprises a transistor T2 through which the load current may be supplied to the apparatus, a " control " transistor T1 which is rendered conductive by a control signal at E, a " detecting " transistor T3 which is rendered conducting by T1 only when the resistance at S is sufficiently high, and causes the transistor T2 to conduct. Should the apparatus have a low resistance, T3 is not rendered conducting so that T2 does not conduct and a capacitor C is charged from E until after a delay a Zener diode ZN breaks down. This permits discharge current to flow to the base of a " signalling " transistor T4 to cause it to conduct to provide a fault indicating signal at SN and to render the transistor T1 non- conductive.
GB6211469A 1968-12-23 1969-12-19 Electronic current control system Expired GB1292128A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR180132 1968-12-23

Publications (1)

Publication Number Publication Date
GB1292128A true GB1292128A (en) 1972-10-11

Family

ID=8658892

Family Applications (1)

Application Number Title Priority Date Filing Date
GB6211469A Expired GB1292128A (en) 1968-12-23 1969-12-19 Electronic current control system

Country Status (6)

Country Link
BE (1) BE743115A (en)
CH (1) CH510347A (en)
DE (1) DE1964557A1 (en)
FR (1) FR1604677A (en)
GB (1) GB1292128A (en)
NL (1) NL6919169A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2140634A (en) * 1983-05-14 1984-11-28 Plessey Co Plc Improvements relating to load trip circuits

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2140634A (en) * 1983-05-14 1984-11-28 Plessey Co Plc Improvements relating to load trip circuits

Also Published As

Publication number Publication date
BE743115A (en) 1970-06-15
CH510347A (en) 1971-07-15
FR1604677A (en) 1972-01-03
NL6919169A (en) 1970-06-25
DE1964557A1 (en) 1970-07-09

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Legal Events

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