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GB1353429A - Electronic telegraph transmission relay - Google Patents

Electronic telegraph transmission relay

Info

Publication number
GB1353429A
GB1353429A GB3273272A GB3273272A GB1353429A GB 1353429 A GB1353429 A GB 1353429A GB 3273272 A GB3273272 A GB 3273272A GB 3273272 A GB3273272 A GB 3273272A GB 1353429 A GB1353429 A GB 1353429A
Authority
GB
United Kingdom
Prior art keywords
line
overvoltage
input signal
transistor
constant current
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
GB3273272A
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.)
International Standard Electric Corp
Original Assignee
International Standard Electric Corp
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 International Standard Electric Corp filed Critical International Standard Electric Corp
Publication of GB1353429A publication Critical patent/GB1353429A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/08—Modifications for reducing interference; Modifications for reducing effects due to line faults ; Receiver end arrangements for detecting or overcoming line faults
    • 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
    • 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
    • H03K17/66—Switching arrangements for passing the current in either direction at will; Switching arrangements for reversing the current at will
    • H03K17/665—Switching arrangements for passing the current in either direction at will; Switching arrangements for reversing the current at will connected to one load terminal only
    • H03K17/666—Switching arrangements for passing the current in either direction at will; Switching arrangements for reversing the current at will connected to one load terminal only the output circuit comprising more than one controlled bipolar transistor
    • 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
    • H03K17/78—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used using opto-electronic devices, i.e. light-emitting and photoelectric devices electrically- or optically-coupled
    • H03K17/795—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used using opto-electronic devices, i.e. light-emitting and photoelectric devices electrically- or optically-coupled controlling bipolar transistors
    • H03K17/7955—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used using opto-electronic devices, i.e. light-emitting and photoelectric devices electrically- or optically-coupled controlling bipolar transistors using phototransistors
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/20—Repeater circuits; Relay circuits
    • H04L25/26—Circuits with optical sensing means, i.e. using opto-couplers for isolation

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Electronic Switches (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

1353429 Data transmission; transistor switching circuits INTERNATIONAL STANDARD ELECTRIC CORP 13 July 1972 [16 July 1971] 32732/72 Headings H4P and H3T An input signal at ENT operates through a light link CD to control the supply of equal and opposite constant currents I1, I2 to a telegraph line LT. A light-emitting diode D3 turns on a transistor Q0 when an input signal is present, so that a further transistor Q1 is on when an input signal is present and off if it is not. Q2 is on when Q1 is off, and Q5 is on when Q1 is on. Q2, Q5 respectively control current sources GI1, GI2, in which Q6, Q8, Q9 are on when Q2 is on, and Q3, Q10 are on when Q5 is on. Constant current I1 thus flows to the line LT through D1 from GI1, or else flows I2 from the line LT through D2 to GI2. An overvoltage on the line is sensed by conduction of further transistors Q4, Q7 according to its polarity, and these act to turn off the associated one of Q2, Q5, thereby turning off the constant current source which was up to that time conducting. The high impedance of the constant current sources limits to a safe value any current flow due to the overvoltage. Resistor potential dividers R20, R21 and R23, R24 reduce considerably the voltage appearing at the emitters of Q4, Q7 as a result of the overvoltage.
GB3273272A 1971-07-16 1972-07-13 Electronic telegraph transmission relay Expired GB1353429A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7126051A FR2146091B1 (en) 1971-07-16 1971-07-16

Publications (1)

Publication Number Publication Date
GB1353429A true GB1353429A (en) 1974-05-15

Family

ID=9080452

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3273272A Expired GB1353429A (en) 1971-07-16 1972-07-13 Electronic telegraph transmission relay

Country Status (8)

Country Link
CA (1) CA966427A (en)
DE (1) DE2234501A1 (en)
ES (1) ES404908A1 (en)
FR (1) FR2146091B1 (en)
GB (1) GB1353429A (en)
IT (1) IT962474B (en)
NL (1) NL7209560A (en)
ZA (1) ZA724629B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2012101415B4 (en) * 2012-09-13 2012-12-06 Gerard Lighting Holdings Pty Ltd Overvoltage Protection Circuit

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2310940C3 (en) * 1973-03-05 1979-05-03 Siemens Ag, 1000 Berlin Und 8000 Muenchen Circuit arrangement for connecting telegraph subscribers to AC transmission equipment and switching systems
FR2471080A1 (en) * 1979-11-28 1981-06-12 Ibm France INTERFACE CIRCUIT CONFORMING TO EIA STANDARDS REALIZED FROM AN OPERATIONAL AMPLIFIER

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE626083A (en) * 1964-03-04
DE1290562C2 (en) * 1965-03-23 1976-09-23 Siemens AG, 1000 Berlin und 8000 München CIRCUIT ARRANGEMENT FOR TRANSFERRING DC IMPULSES

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2012101415B4 (en) * 2012-09-13 2012-12-06 Gerard Lighting Holdings Pty Ltd Overvoltage Protection Circuit

Also Published As

Publication number Publication date
DE2234501A1 (en) 1973-01-25
IT962474B (en) 1973-12-20
NL7209560A (en) 1973-01-18
AU4438672A (en) 1974-01-17
ES404908A1 (en) 1975-06-16
ZA724629B (en) 1973-03-28
CA966427A (en) 1975-04-22
FR2146091A1 (en) 1973-03-02
FR2146091B1 (en) 1976-05-28

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Legal Events

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