GB1478810A - Detection circuits for monitoring current changes - Google Patents

Detection circuits for monitoring current changes

Info

Publication number
GB1478810A
GB1478810A GB4776775A GB4776775A GB1478810A GB 1478810 A GB1478810 A GB 1478810A GB 4776775 A GB4776775 A GB 4776775A GB 4776775 A GB4776775 A GB 4776775A GB 1478810 A GB1478810 A GB 1478810A
Authority
GB
United Kingdom
Prior art keywords
sample
constituted
capacitor
current
change
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
GB4776775A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB4776775A priority Critical patent/GB1478810A/en
Priority to BR7607855A priority patent/BR7607855A/en
Publication of GB1478810A publication Critical patent/GB1478810A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
    • G01R15/202—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices using Hall-effect devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/12—Measuring rate of change

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

1478810 Monitoring rate of change of current STANDARD TELEPHONES & CABLES Ltd 20 Nov 1975 47767/75 Heading G1U In a circuit that detects the rate of change of current I c , Fig. 1, the current is repeatedly sampled by a Hall plate HE having a pulsed supply P1, T, each sample is stored on a capacitor C during the second half P3 of the sample duration P1, and each sample is compared, during the first half P2 of the sample duration, with the immediately preceeding sample already stored on the capacitor C. As shown in Fig. 1, the comparison is effected in both directions, by two amplifiers VC1, VC2, and if a sufficiently large change between two successive samples is detected a latch L is set into the corresponding one of its two states. A circuit Fig. 2 (not shown) shows the amplifier A of Fig. 1 constituted by a long-tailed pair (T1, T2), the switch SW constituted by further transistors (T3 to T6), and the comparator constituted by another longtailed pair (T7, T8) having its output stored on a further capacitor (C2) so that an output voltage equal to the difference between successive pairs of samples is available.
GB4776775A 1975-11-20 1975-11-20 Detection circuits for monitoring current changes Expired GB1478810A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB4776775A GB1478810A (en) 1975-11-20 1975-11-20 Detection circuits for monitoring current changes
BR7607855A BR7607855A (en) 1975-11-20 1976-11-19 ELECTRIC CIRCUIT FOR CURRENT CONTROL ON TRANSMISSION LINE

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4776775A GB1478810A (en) 1975-11-20 1975-11-20 Detection circuits for monitoring current changes

Publications (1)

Publication Number Publication Date
GB1478810A true GB1478810A (en) 1977-07-06

Family

ID=10446185

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4776775A Expired GB1478810A (en) 1975-11-20 1975-11-20 Detection circuits for monitoring current changes

Country Status (2)

Country Link
BR (1) BR7607855A (en)
GB (1) GB1478810A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2425076A1 (en) * 1978-05-01 1979-11-30 Anglo Amer Corp South Africa METHOD AND APPARATUS FOR DETECTION OF THE VARIATION SPEED OF AN ELECTRIC SIGNAL
FR2553894A1 (en) * 1983-10-25 1985-04-26 Europ Agence Spatiale METHOD AND CIRCUIT FOR CONTROLLING THE BATTERY CHARGE TO THE NI-CD
GB2169720A (en) * 1985-01-10 1986-07-16 Brownell Limited Detecting rate of change of signals
GB2213943A (en) * 1988-01-14 1989-08-23 Yorkshire Water Authority Hall-effect arrangements
EP0475704A1 (en) * 1990-09-10 1992-03-18 Motorola, Inc. Drive circuit for an electric motor
EP1400812A1 (en) * 2002-09-12 2004-03-24 ABB Service S.r.l Device and method for measuring a current
CN100445756C (en) * 2004-10-29 2008-12-24 松下电器产业株式会社 Voltage detection circuit, overcurrent detection circuit, charging current control system, and voltage detection method

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2425076A1 (en) * 1978-05-01 1979-11-30 Anglo Amer Corp South Africa METHOD AND APPARATUS FOR DETECTION OF THE VARIATION SPEED OF AN ELECTRIC SIGNAL
FR2553894A1 (en) * 1983-10-25 1985-04-26 Europ Agence Spatiale METHOD AND CIRCUIT FOR CONTROLLING THE BATTERY CHARGE TO THE NI-CD
GB2169720A (en) * 1985-01-10 1986-07-16 Brownell Limited Detecting rate of change of signals
GB2213943A (en) * 1988-01-14 1989-08-23 Yorkshire Water Authority Hall-effect arrangements
EP0475704A1 (en) * 1990-09-10 1992-03-18 Motorola, Inc. Drive circuit for an electric motor
EP1400812A1 (en) * 2002-09-12 2004-03-24 ABB Service S.r.l Device and method for measuring a current
US7227347B2 (en) 2002-09-12 2007-06-05 Abb Services S.R.L. Device and method for measuring a current
CN100445756C (en) * 2004-10-29 2008-12-24 松下电器产业株式会社 Voltage detection circuit, overcurrent detection circuit, charging current control system, and voltage detection method

Also Published As

Publication number Publication date
BR7607855A (en) 1977-10-25

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Legal Events

Date Code Title Description
PS Patent sealed
746 Register noted 'licences of right' (sect. 46/1977)
PCNP Patent ceased through non-payment of renewal fee