GB883415A - Improvements in or relating to monitoring circuits - Google Patents

Improvements in or relating to monitoring circuits

Info

Publication number
GB883415A
GB883415A GB378957A GB378957A GB883415A GB 883415 A GB883415 A GB 883415A GB 378957 A GB378957 A GB 378957A GB 378957 A GB378957 A GB 378957A GB 883415 A GB883415 A GB 883415A
Authority
GB
United Kingdom
Prior art keywords
direct current
core
transistor
winding
pulses
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
GB378957A
Inventor
Eric Lawrence Bubb
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.)
Post Office
Original Assignee
Post Office
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 Post Office filed Critical Post Office
Priority to GB378957A priority Critical patent/GB883415A/en
Publication of GB883415A publication Critical patent/GB883415A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)

Abstract

883,415. Circuits employing bi-stable magnetic elements. POSTMASTER GENERAL. May 2, 1958 [Feb. 4, 1957], No. 3789/57. Class 40 (9). An output pulse is produced in a lead L2 by way of a transistor VT1 when a direct current in a lead L falls below or exceeds predetermined limits, the direct current being applied to windings A on ferrite cores X1, X2, having rectangular hysteresis loops which are periodically driven to the set condition by pulses α2 and have output windings C connected to the transistor. Core XI is reset and produces an output pulse when the direct current exceeds a predetermined value, while core X2 is periodically reset by reference current pulses α1 in winding D which act in oppositionto the direct current in winding A. Core X2 therefore produces an output pulse in its winding C if the direct current is below a given value. The α1 and α2 pulses are applied alternatively to the cores so that the initial set conditions are re-established, the reference current pulse α1 being applied over a further core X3 and a transistor VT2.
GB378957A 1957-02-04 1957-02-04 Improvements in or relating to monitoring circuits Expired GB883415A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB378957A GB883415A (en) 1957-02-04 1957-02-04 Improvements in or relating to monitoring circuits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB378957A GB883415A (en) 1957-02-04 1957-02-04 Improvements in or relating to monitoring circuits

Publications (1)

Publication Number Publication Date
GB883415A true GB883415A (en) 1961-11-29

Family

ID=9764939

Family Applications (1)

Application Number Title Priority Date Filing Date
GB378957A Expired GB883415A (en) 1957-02-04 1957-02-04 Improvements in or relating to monitoring circuits

Country Status (1)

Country Link
GB (1) GB883415A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2824180A1 (en) * 1978-06-02 1979-12-06 Bosch Gmbh Robert Current monitoring threshold switch - induces pick=up coil pulse when polarised wire field is reversed by measurement current field

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2824180A1 (en) * 1978-06-02 1979-12-06 Bosch Gmbh Robert Current monitoring threshold switch - induces pick=up coil pulse when polarised wire field is reversed by measurement current field

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