GB1435059A - Galvanic isolation of telegraphic equipment - Google Patents

Galvanic isolation of telegraphic equipment

Info

Publication number
GB1435059A
GB1435059A GB1253974A GB1253974A GB1435059A GB 1435059 A GB1435059 A GB 1435059A GB 1253974 A GB1253974 A GB 1253974A GB 1253974 A GB1253974 A GB 1253974A GB 1435059 A GB1435059 A GB 1435059A
Authority
GB
United Kingdom
Prior art keywords
line
subtractor
isolating
coupler
amplifier
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
GB1253974A
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.)
ITT Creed Ltd
Original Assignee
ITT Creed 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 ITT Creed Ltd filed Critical ITT Creed Ltd
Priority to GB1253974A priority Critical patent/GB1435059A/en
Publication of GB1435059A publication Critical patent/GB1435059A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/80—Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water
    • H04B10/801—Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water using optical interconnects, e.g. light coupled isolators, circuit board interconnections
    • H04B10/802—Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water using optical interconnects, e.g. light coupled isolators, circuit board interconnections for isolation, e.g. using optocouplers
    • 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

Abstract

1435059 Telegraphy; isolating devices; photo isolating circuits ITT CREED Ltd 21 March 1974 12539/74 Heading H3T An arrangement for electrically isolating telegraph apparatus, from a line, line signals are fed through a subtractor to a first isolating non- linear coupler providing an input to a high gain amplifier driving in turn a second coupler the output from which source is applied to the subtractor. The amplifier gain is arranged so that output current is substantially linearly related to line current. In a block diagram (Fig. 1, not shown) line currents are led through subtractor (2) and through square root circuit (4) to amplifier (5) supplying current to utilizing device (6), i.e. tape punch, teleprinter &c. and thence through another square root circuit (3) similar to (4) to a second input of subtracter (2). In a practical arrangement line currents pass through a resistor RT, considered as a subtractor, to light emitting element DF forming part of coupler 4, together with sensitive element PF supplied from source 7 and controlling amplifier 5 which feeds device 6 and thence to a second light emitting element 3 forming with sensitive element PB the second non-linear coupler, output from which is fed back to input point J. In this arrangement line current supplies power for operating DF, PB but in an alternative arrangement (Fig. 3, not shown) a separate isolated supply (9) is led to DP through transistor (8) amplifying line current. Supply (9) may be of any type, e.g. transformer/rectifier, battery, or set of photo voltaic cells.
GB1253974A 1974-03-21 1974-03-21 Galvanic isolation of telegraphic equipment Expired GB1435059A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1253974A GB1435059A (en) 1974-03-21 1974-03-21 Galvanic isolation of telegraphic equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1253974A GB1435059A (en) 1974-03-21 1974-03-21 Galvanic isolation of telegraphic equipment

Publications (1)

Publication Number Publication Date
GB1435059A true GB1435059A (en) 1976-05-12

Family

ID=10006488

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1253974A Expired GB1435059A (en) 1974-03-21 1974-03-21 Galvanic isolation of telegraphic equipment

Country Status (1)

Country Link
GB (1) GB1435059A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2138137A (en) * 1983-03-07 1984-10-17 Brown Boveri Kent Ltd Improvements in sensing apparatus
GB2144547A (en) * 1983-08-04 1985-03-06 Gen Electric Plc A strain sensor
EP0139210A2 (en) * 1983-09-30 1985-05-02 Kabushiki Kaisha Toshiba Converting circuit

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2138137A (en) * 1983-03-07 1984-10-17 Brown Boveri Kent Ltd Improvements in sensing apparatus
GB2144547A (en) * 1983-08-04 1985-03-06 Gen Electric Plc A strain sensor
EP0139210A2 (en) * 1983-09-30 1985-05-02 Kabushiki Kaisha Toshiba Converting circuit
EP0139210A3 (en) * 1983-09-30 1986-04-16 Kabushiki Kaisha Toshiba Converting circuit
US4739174A (en) * 1983-09-30 1988-04-19 Kabushiki Kaisha Toshiba Converting circuit having first and second optically coupled phototransistors and first and second operational amplifiers

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Legal Events

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