FR2359532A1 - Balanced load protection circuit - is controlled from pilot network and parallel nominal load connected across supply - Google Patents

Balanced load protection circuit - is controlled from pilot network and parallel nominal load connected across supply

Info

Publication number
FR2359532A1
FR2359532A1 FR7622106A FR7622106A FR2359532A1 FR 2359532 A1 FR2359532 A1 FR 2359532A1 FR 7622106 A FR7622106 A FR 7622106A FR 7622106 A FR7622106 A FR 7622106A FR 2359532 A1 FR2359532 A1 FR 2359532A1
Authority
FR
France
Prior art keywords
supply
controlled
transistor
circuit
protection circuit
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
FR7622106A
Other languages
French (fr)
Other versions
FR2359532B1 (en
Inventor
Yves Legrand
Rene Migeon
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.)
Alcatel CIT SA
Original Assignee
Alcatel CIT SA
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 Alcatel CIT SA filed Critical Alcatel CIT SA
Priority to FR7622106A priority Critical patent/FR2359532A1/en
Publication of FR2359532A1 publication Critical patent/FR2359532A1/en
Application granted granted Critical
Publication of FR2359532B1 publication Critical patent/FR2359532B1/fr
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage

Landscapes

  • Amplifiers (AREA)

Abstract

The circuit provides protection for leads which are balanced about a potential referenced to earth. The circuit normally is required when the load impedance to earth varies due to component failure. The circuit is connected in parallel across the load d. c. supply (1, 2) and consists of a zener diode (11) and power transistor (3) in series between the positive and negative supply rails. The transistor is driven from an amplifying transistor (4) both being connected as a Darlington pair. The Darlington pair is controlled from a pilot circuit sensitive to both positive and negative rail variations about earh (6). Variations are detected on two Zener diodes (5, 8) whose common point is grounded, the remainder of the chain consisting of a transistor-resistor-diode combination between the two supply rails.
FR7622106A 1976-07-20 1976-07-20 Balanced load protection circuit - is controlled from pilot network and parallel nominal load connected across supply Granted FR2359532A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7622106A FR2359532A1 (en) 1976-07-20 1976-07-20 Balanced load protection circuit - is controlled from pilot network and parallel nominal load connected across supply

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7622106A FR2359532A1 (en) 1976-07-20 1976-07-20 Balanced load protection circuit - is controlled from pilot network and parallel nominal load connected across supply

Publications (2)

Publication Number Publication Date
FR2359532A1 true FR2359532A1 (en) 1978-02-17
FR2359532B1 FR2359532B1 (en) 1978-12-15

Family

ID=9175907

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7622106A Granted FR2359532A1 (en) 1976-07-20 1976-07-20 Balanced load protection circuit - is controlled from pilot network and parallel nominal load connected across supply

Country Status (1)

Country Link
FR (1) FR2359532A1 (en)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1263538A (en) * 1960-07-12 1961-06-09 Marconi Wireless Telegraph Co Improvements to protection circuits
DE1513491A1 (en) * 1965-07-16 1969-12-11 Siemens Ag Circuit for limiting high DC voltages
US3544720A (en) * 1969-03-26 1970-12-01 Mcintosh Lab Inc Protective circuit for loudspeaker
FR2079352A1 (en) * 1970-02-11 1971-11-12 Sybron Corp
US3691427A (en) * 1970-03-29 1972-09-12 Victor Company Of Japan Protective circuit for an all stage direct-coupled transistor output transformerless-output condenserless amplifier
FR2179151A1 (en) * 1972-04-06 1973-11-16 Foxboro Co
US3790856A (en) * 1973-06-04 1974-02-05 Gte Automatic Electric Lab Inc Overvoltage protection circuit for dual outputs of opposite polarity

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1263538A (en) * 1960-07-12 1961-06-09 Marconi Wireless Telegraph Co Improvements to protection circuits
DE1513491A1 (en) * 1965-07-16 1969-12-11 Siemens Ag Circuit for limiting high DC voltages
US3544720A (en) * 1969-03-26 1970-12-01 Mcintosh Lab Inc Protective circuit for loudspeaker
FR2079352A1 (en) * 1970-02-11 1971-11-12 Sybron Corp
US3691427A (en) * 1970-03-29 1972-09-12 Victor Company Of Japan Protective circuit for an all stage direct-coupled transistor output transformerless-output condenserless amplifier
FR2179151A1 (en) * 1972-04-06 1973-11-16 Foxboro Co
US3790856A (en) * 1973-06-04 1974-02-05 Gte Automatic Electric Lab Inc Overvoltage protection circuit for dual outputs of opposite polarity

Also Published As

Publication number Publication date
FR2359532B1 (en) 1978-12-15

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Legal Events

Date Code Title Description
ST Notification of lapse