GB1005261A - Improvements in or relating to electrical protective equipment - Google Patents

Improvements in or relating to electrical protective equipment

Info

Publication number
GB1005261A
GB1005261A GB1889862A GB1889862A GB1005261A GB 1005261 A GB1005261 A GB 1005261A GB 1889862 A GB1889862 A GB 1889862A GB 1889862 A GB1889862 A GB 1889862A GB 1005261 A GB1005261 A GB 1005261A
Authority
GB
United Kingdom
Prior art keywords
earth
switching device
line
resistor
transistor
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
GB1889862A
Inventor
Charles Thomas Baker
John Frank Greenaway
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.)
British Telecommunications PLC
British Telecommunications Research Ltd
Original Assignee
British Telecommunications PLC
British Telecommunications Research 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 British Telecommunications PLC, British Telecommunications Research Ltd filed Critical British Telecommunications PLC
Priority to GB1889862A priority Critical patent/GB1005261A/en
Publication of GB1005261A publication Critical patent/GB1005261A/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
    • H03K17/081—Modifications for protecting switching circuit against overcurrent or overvoltage without feedback from the output circuit to the control circuit
    • H03K17/0814—Modifications for protecting switching circuit against overcurrent or overvoltage without feedback from the output circuit to the control circuit by measures taken in the output circuit
    • H03K17/08146—Modifications for protecting switching circuit against overcurrent or overvoltage without feedback from the output circuit to the control circuit by measures taken in the output circuit in bipolar transistor switches
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
    • H02H9/041—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using a short-circuiting device
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/52—Circuit arrangements for protecting such amplifiers

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

1,005,261. Transistor switching circuits. BRITISH TELECOMMUNICATIONS RESEARCH Ltd. May 8, 1963 [May 16, 1962], No. 18898/62. Heading H3T. [Also in Division H2] In an arrangement for protecting electronic equipment employing semi-conductors against excessive supply voltages a Zener diode is connected in series with a resistor between the supply line and earth, the voltage across the resistor triggering a bi-stable switching device to apply a low impedance connection between the line and earth upon the supply voltage rising above a predetermined value and thereby to blow a fuse F1. In a first embodiment the switching device is a silicon controlled rectifier CR; the protective circuit is connected to the line by a diode D and may be connected also to several other lines by similar means. In a second embodiment the switching device takes the form of a bi-stable circuit employing transistors T1, T2 and controlling a third transistor T3 connected between the supply line and earth.
GB1889862A 1962-05-16 1962-05-16 Improvements in or relating to electrical protective equipment Expired GB1005261A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1889862A GB1005261A (en) 1962-05-16 1962-05-16 Improvements in or relating to electrical protective equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1889862A GB1005261A (en) 1962-05-16 1962-05-16 Improvements in or relating to electrical protective equipment

Publications (1)

Publication Number Publication Date
GB1005261A true GB1005261A (en) 1965-09-22

Family

ID=10120304

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1889862A Expired GB1005261A (en) 1962-05-16 1962-05-16 Improvements in or relating to electrical protective equipment

Country Status (1)

Country Link
GB (1) GB1005261A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2034741A1 (en) * 1969-03-07 1970-12-11 M & T Chemicals Inc

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2034741A1 (en) * 1969-03-07 1970-12-11 M & T Chemicals Inc

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