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GB2002996A - Power Supply Circuits - Google Patents

Power Supply Circuits

Info

Publication number
GB2002996A
GB2002996A GB7832937A GB7832937A GB2002996A GB 2002996 A GB2002996 A GB 2002996A GB 7832937 A GB7832937 A GB 7832937A GB 7832937 A GB7832937 A GB 7832937A GB 2002996 A GB2002996 A GB 2002996A
Authority
GB
United Kingdom
Prior art keywords
storage device
electrical energy
impedance means
power supply
supply circuits
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
GB7832937A
Other versions
GB2002996B (en
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 GB7832937A priority Critical patent/GB2002996B/en
Publication of GB2002996A publication Critical patent/GB2002996A/en
Application granted granted Critical
Publication of GB2002996B publication Critical patent/GB2002996B/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/08—Current supply arrangements for telephone systems with current supply sources at the substations

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interface Circuits In Exchanges (AREA)

Abstract

An electrical energy storage device is connected in parallel with impedance means by means providing a unidirectional transfer of electrical energy from a direct current path through the impedance means and a by-pass circuit is connected in parallel with the impedance means. In the principal use of the invention in a telephone instrument, the by-pass circuit by-passes current for most of the time the telephone instrument is in use but assumes a non by-pass condition for short periods to allow the electrical storage device to take in electrical energy without interfering with ordinary operation of the instrument. The storage device is an electrolytic capacitor or a secondary cell.
GB7832937A 1977-08-10 1978-08-10 Power supply circuits Expired GB2002996B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7832937A GB2002996B (en) 1977-08-10 1978-08-10 Power supply circuits

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB3350277 1977-08-10
GB7832937A GB2002996B (en) 1977-08-10 1978-08-10 Power supply circuits

Publications (2)

Publication Number Publication Date
GB2002996A true GB2002996A (en) 1979-02-28
GB2002996B GB2002996B (en) 1982-01-27

Family

ID=26261899

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7832937A Expired GB2002996B (en) 1977-08-10 1978-08-10 Power supply circuits

Country Status (1)

Country Link
GB (1) GB2002996B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2517150A1 (en) * 1981-11-20 1983-05-27 Thomson Csf Mat Tel MICROPROCESSOR MANAGED MICROPROCESSOR CIRCUIT WITH INTEGRATED 2-WIRE 4-WIRE TRANSMISSION CIRCUIT AND CURRENT LINE BACKUP POWER SUPPLY
FR2518858A1 (en) * 1981-12-23 1983-06-24 Jeumont Schneider DEVICE FOR TRANSMITTING SIGNALS ON A LINE ALSO PROVIDING A CONTINUOUS VOLTAGE SUPPLY
EP1003309A3 (en) * 1998-11-19 2003-09-17 Firma Lingg & Janke OHG Arrangement for coupling to a bus without polarity faults

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2517150A1 (en) * 1981-11-20 1983-05-27 Thomson Csf Mat Tel MICROPROCESSOR MANAGED MICROPROCESSOR CIRCUIT WITH INTEGRATED 2-WIRE 4-WIRE TRANSMISSION CIRCUIT AND CURRENT LINE BACKUP POWER SUPPLY
EP0080396A1 (en) * 1981-11-20 1983-06-01 Thomson-Csf Telephone Integrated circuit microprocessor-controlled telephone two wire/four wire transmission circuit, and line current safeguard powering
US4562309A (en) * 1981-11-20 1985-12-31 Thomson-Csf Telephone Telephone circuit controlled by a 2 wire - 4 wire transmission integrated circuit microprocessor with line current emergency supply
FR2518858A1 (en) * 1981-12-23 1983-06-24 Jeumont Schneider DEVICE FOR TRANSMITTING SIGNALS ON A LINE ALSO PROVIDING A CONTINUOUS VOLTAGE SUPPLY
EP0082791A1 (en) * 1981-12-23 1983-06-29 JEUMONT-SCHNEIDER Société anonyme dite: Signal transmission device over a line also assuring a D.C. current supply
EP1003309A3 (en) * 1998-11-19 2003-09-17 Firma Lingg & Janke OHG Arrangement for coupling to a bus without polarity faults

Also Published As

Publication number Publication date
GB2002996B (en) 1982-01-27

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Legal Events

Date Code Title Description
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee