CA2077522A1 - Battery feed circuit for supplying feed current to telephone set - Google Patents

Battery feed circuit for supplying feed current to telephone set

Info

Publication number
CA2077522A1
CA2077522A1 CA2077522A CA2077522A CA2077522A1 CA 2077522 A1 CA2077522 A1 CA 2077522A1 CA 2077522 A CA2077522 A CA 2077522A CA 2077522 A CA2077522 A CA 2077522A CA 2077522 A1 CA2077522 A1 CA 2077522A1
Authority
CA
Canada
Prior art keywords
line
tip
circuit
voltage
control signal
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
CA2077522A
Other languages
French (fr)
Other versions
CA2077522C (en
Inventor
Kenji Takato
Kazuhiro Yoshida
Kazuyuki Minohara
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.)
Fujitsu Ltd
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of CA2077522A1 publication Critical patent/CA2077522A1/en
Application granted granted Critical
Publication of CA2077522C publication Critical patent/CA2077522C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/001—Current supply source at the exchanger providing current to substations
    • H04M19/005—Feeding arrangements without the use of line transformers

Abstract

A battery feed circuit supplies a feed current to a telephone set via a 2-wire telecommunication line formed of a TIP line and a RING line. The battery feed circuit includes a first voltage detection circuit for detecting a first voltage across the TIP line and a ground line, a second voltage detection circuit for detecting a second voltage across the RING line and a power line connected to a power supply of the battery feed circuit, a current source responsive to a first control signal for respectively generating first and second currents in the TIP and RING lines, the first and second currents being equal in magnitude and opposite in direction, the current source also varying the first and second currents in response to a second control signal so as to be in proportion to a common mode voltage across the TIP and RING lines, a first feedback circuit responsive to the first and second voltages detected by the first and second voltage detection circuits for generating the first control signal, and a second feedback circuit for generating the second control signal by detecting the common mode voltage across the TIP and RING lines.
CA002077522A 1991-09-05 1992-09-03 Battery feed circuit for supplying feed current to telephone set Expired - Fee Related CA2077522C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP3226002A JPH0568120A (en) 1991-09-05 1991-09-05 Power feeding circuit
JP3-226002 1991-09-05

Publications (2)

Publication Number Publication Date
CA2077522A1 true CA2077522A1 (en) 1993-03-06
CA2077522C CA2077522C (en) 1995-12-26

Family

ID=16838253

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002077522A Expired - Fee Related CA2077522C (en) 1991-09-05 1992-09-03 Battery feed circuit for supplying feed current to telephone set

Country Status (3)

Country Link
US (1) US5347577A (en)
JP (1) JPH0568120A (en)
CA (1) CA2077522C (en)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE9403152L (en) * 1994-09-20 1995-10-30 Ericsson Telefon Ab L M Method and apparatus for determining the deviation of longitudinal signal components from a predetermined value
US5659610A (en) * 1994-09-28 1997-08-19 Lucent Technologies Inc. Battery feed circuit
US5619567A (en) * 1994-10-31 1997-04-08 Advanced Micro Devices Variable DC feed characteristic in a subscriber line interface circuit
DE19530927C2 (en) * 1995-08-23 2002-11-07 Huber Signalbau Muenchen Adaptation circuit for an electronic component or an assembly
JP2845181B2 (en) * 1995-09-22 1999-01-13 日本電気株式会社 Subscriber circuit
US5721774A (en) * 1995-12-15 1998-02-24 Lucent Technologies Inc. Longitudinally balanced, dual voltage line-feed circuit
JP3581971B2 (en) * 1996-05-22 2004-10-27 株式会社ボッシュオートモーティブシステム EMI grounding structure for in-vehicle control unit
DE19654221B4 (en) * 1996-12-23 2005-11-24 Telefonaktiebolaget Lm Ericsson (Publ) Line connection circuit
US6169801B1 (en) 1998-03-16 2001-01-02 Midcom, Inc. Digital isolation apparatus and method
DE69927927D1 (en) * 1998-12-31 2005-12-01 St Microelectronics Srl Monolithically integrated subscriber circuit arrangement for driving a broadband line for data transmission
EP1173966B1 (en) * 1999-04-22 2005-04-20 Silicon Laboratories, Inc. Subscriber line interface circuitry
US7180999B1 (en) 1999-04-22 2007-02-20 Silicon Laboratories, Inc. Subscriber line interface circuitry
US6567521B1 (en) 1999-08-17 2003-05-20 Silicon Laboratories, Inc. Subscriber loop interface circuitry having bifurcated common mode control
US7158633B1 (en) 1999-11-16 2007-01-02 Silicon Laboratories, Inc. Method and apparatus for monitoring subscriber loop interface circuitry power dissipation
JP3931025B2 (en) * 2000-09-08 2007-06-13 三菱電機株式会社 Self-bias adjustment circuit
US20050220293A1 (en) * 2000-10-25 2005-10-06 Hein Jerrell P Subscriber loop interface circuitry with tracking battery supply
DE10140358C2 (en) * 2001-08-17 2003-07-10 Infineon Technologies Ag Telephone system with current control in the constant current range

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4476350A (en) * 1981-02-17 1984-10-09 Bell Telephone Laboratories, Incorporated Battery feed circuit
JPS61154347A (en) * 1984-12-27 1986-07-14 Fujitsu Ltd Feeding circuit of exchange
SE453240B (en) * 1986-05-06 1988-01-18 Ericsson Telefon Ab L M DEVICE IN A TELECOMMUNICATION SYSTEM FOR POWERING A PHONE DEVICE
CA1291836C (en) * 1987-06-17 1991-11-05 Kenji Takato Battery feed circuit
JPH088617B2 (en) * 1988-09-19 1996-01-29 富士通株式会社 Termination circuit in the power supply section of the electronic exchange

Also Published As

Publication number Publication date
US5347577A (en) 1994-09-13
JPH0568120A (en) 1993-03-19
CA2077522C (en) 1995-12-26

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Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed