FR2446574A1 - Telephone relay current control - monitors current drawn by relays using common detector, removes supply on detecting excess and periodically re-checks circuit (BR 23.9.80) - Google Patents

Telephone relay current control - monitors current drawn by relays using common detector, removes supply on detecting excess and periodically re-checks circuit (BR 23.9.80)

Info

Publication number
FR2446574A1
FR2446574A1 FR7900842A FR7900842A FR2446574A1 FR 2446574 A1 FR2446574 A1 FR 2446574A1 FR 7900842 A FR7900842 A FR 7900842A FR 7900842 A FR7900842 A FR 7900842A FR 2446574 A1 FR2446574 A1 FR 2446574A1
Authority
FR
France
Prior art keywords
relays
periodically
control transistors
flop
flip
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.)
Granted
Application number
FR7900842A
Other languages
French (fr)
Other versions
FR2446574B1 (en
Inventor
Pierre Jean Abdesselam
Xavier Chaveron
Herve Marie Jean Paul Treps
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.)
Constr Telephoniques
Original Assignee
Constr Telephoniques
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 Constr Telephoniques filed Critical Constr Telephoniques
Priority to FR7900842A priority Critical patent/FR2446574A1/en
Priority to BR8000207A priority patent/BR8000207A/en
Publication of FR2446574A1 publication Critical patent/FR2446574A1/en
Application granted granted Critical
Publication of FR2446574B1 publication Critical patent/FR2446574B1/fr
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/20—Testing circuits or apparatus; Circuits or apparatus for detecting, indicating, or signalling faults or troubles
    • H04Q1/22—Automatic arrangements
    • H04Q1/24—Automatic arrangements for connection devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Monitoring And Testing Of Exchanges (AREA)

Abstract

The controller monitors the current supplied to electromechanical equipment such as relays (17) through their control transistors (16). Transistor (18) senses the voltage drop across a common emitter resistor (23) of the control transistors (16). The sensing transistor (18) has a parallel capacitor/resistor (26, 19) collector circuit to filter out transients. It is coupled through an inverter (INVI) and one gate of an AND gate to a control input (S) of a flip-flop (14) which drives the control transistors (16). The sensing transistor (18) is also coupled through a logic circuit (22, 80) to the flip-flop (14). An excess current through the common emitter resistor (23) applies a logical signal through the sensing transistor (18) to the logic gates to switch off the control transistors (16) via the flip-flop (14). A clock signal also applied to the OR gate periodically retests the control transistors for excess current.
FR7900842A 1979-01-15 1979-01-15 Telephone relay current control - monitors current drawn by relays using common detector, removes supply on detecting excess and periodically re-checks circuit (BR 23.9.80) Granted FR2446574A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR7900842A FR2446574A1 (en) 1979-01-15 1979-01-15 Telephone relay current control - monitors current drawn by relays using common detector, removes supply on detecting excess and periodically re-checks circuit (BR 23.9.80)
BR8000207A BR8000207A (en) 1979-01-15 1980-01-14 EXCESS CURRENT CONTROL DEVICE FOR INTERFACE BETWEEN ELECTRONIC AND ELECTROMECHANICAL EQUIPMENT

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7900842A FR2446574A1 (en) 1979-01-15 1979-01-15 Telephone relay current control - monitors current drawn by relays using common detector, removes supply on detecting excess and periodically re-checks circuit (BR 23.9.80)

Publications (2)

Publication Number Publication Date
FR2446574A1 true FR2446574A1 (en) 1980-08-08
FR2446574B1 FR2446574B1 (en) 1984-04-20

Family

ID=9220731

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7900842A Granted FR2446574A1 (en) 1979-01-15 1979-01-15 Telephone relay current control - monitors current drawn by relays using common detector, removes supply on detecting excess and periodically re-checks circuit (BR 23.9.80)

Country Status (2)

Country Link
BR (1) BR8000207A (en)
FR (1) FR2446574A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1523390A (en) * 1967-03-22 1968-05-03 Constr Telephoniques Matrix circuit improvements
GB1176014A (en) * 1966-04-09 1970-01-01 Bolkow Gmbh A Circuit Arrangement for Testing One or More Selected Relays in a Switching Matrix.
DE1907563A1 (en) * 1969-02-14 1970-09-03 Standard Elek K Lorenz Ag Circuit arrangement for checking the response of an electrical switching means
DE2534759A1 (en) * 1975-08-04 1977-02-24 Siemens Ag Crossbar distribution switch for telephone exchanges etc. - has coupling elements supplied with switching signals via blocking elements

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1176014A (en) * 1966-04-09 1970-01-01 Bolkow Gmbh A Circuit Arrangement for Testing One or More Selected Relays in a Switching Matrix.
FR1523390A (en) * 1967-03-22 1968-05-03 Constr Telephoniques Matrix circuit improvements
DE1907563A1 (en) * 1969-02-14 1970-09-03 Standard Elek K Lorenz Ag Circuit arrangement for checking the response of an electrical switching means
DE2534759A1 (en) * 1975-08-04 1977-02-24 Siemens Ag Crossbar distribution switch for telephone exchanges etc. - has coupling elements supplied with switching signals via blocking elements

Also Published As

Publication number Publication date
FR2446574B1 (en) 1984-04-20
BR8000207A (en) 1980-09-23

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Legal Events

Date Code Title Description
TP Transmission of property