JPS55154866A - Current supply circuit for telephone switchboard - Google Patents

Current supply circuit for telephone switchboard

Info

Publication number
JPS55154866A
JPS55154866A JP6263879A JP6263879A JPS55154866A JP S55154866 A JPS55154866 A JP S55154866A JP 6263879 A JP6263879 A JP 6263879A JP 6263879 A JP6263879 A JP 6263879A JP S55154866 A JPS55154866 A JP S55154866A
Authority
JP
Japan
Prior art keywords
current
current supply
supply circuit
subscriber
limiting
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
JP6263879A
Other languages
Japanese (ja)
Other versions
JPS5930356B2 (en
Inventor
Tetsuo Takeshita
Yoshinori Oikawa
Takehiko Tsutsumi
Koichi Hasegawa
Haruki Fukuda
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
Hitachi Ltd
NEC Corp
Nippon Telegraph and Telephone Corp
Oki Electric Industry Co Ltd
Original Assignee
Fujitsu Ltd
Hitachi Ltd
NEC Corp
Nippon Telegraph and Telephone Corp
Oki Electric Industry Co Ltd
Nippon Electric Co Ltd
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 Fujitsu Ltd, Hitachi Ltd, NEC Corp, Nippon Telegraph and Telephone Corp, Oki Electric Industry Co Ltd, Nippon Electric Co Ltd filed Critical Fujitsu Ltd
Priority to JP54062638A priority Critical patent/JPS5930356B2/en
Publication of JPS55154866A publication Critical patent/JPS55154866A/en
Publication of JPS5930356B2 publication Critical patent/JPS5930356B2/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
    • H04M19/001—Current supply source at the exchanger providing current to substations
    • H04M19/005—Feeding arrangements without the use of line transformers

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)

Abstract

PURPOSE:To prevent unneeded heating with electric power consumption lessened by limiting a current supply to a subscriber, by limiting the maximum value of the output current of a current-supplying current amplifier by the use of a Zener diode. CONSTITUTION:Output currents of current-supplying current amplifiers 1 and 1' are limited by Zener diode ZD1 and then supplied to output voltage detector 3 and a load (e.g., subscriber's line) between terminal 5 and 5' by way of driving current amplifiers 2 and 2'. Therefore, even a loop with small load resistance can prevent a needed current or more from flowing.
JP54062638A 1979-05-23 1979-05-23 Current supply circuit for telephone exchange Expired JPS5930356B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP54062638A JPS5930356B2 (en) 1979-05-23 1979-05-23 Current supply circuit for telephone exchange

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP54062638A JPS5930356B2 (en) 1979-05-23 1979-05-23 Current supply circuit for telephone exchange

Publications (2)

Publication Number Publication Date
JPS55154866A true JPS55154866A (en) 1980-12-02
JPS5930356B2 JPS5930356B2 (en) 1984-07-26

Family

ID=13206059

Family Applications (1)

Application Number Title Priority Date Filing Date
JP54062638A Expired JPS5930356B2 (en) 1979-05-23 1979-05-23 Current supply circuit for telephone exchange

Country Status (1)

Country Link
JP (1) JPS5930356B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0057009A1 (en) * 1981-01-28 1982-08-04 Hitachi, Ltd. Current supply circuit
JPS59212068A (en) * 1983-05-17 1984-11-30 Sanken Electric Co Ltd Direct current feeding circuit
JPS60203061A (en) * 1984-03-28 1985-10-14 Nec Corp Electronic choke circuit

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0539813Y2 (en) * 1987-09-17 1993-10-08

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0057009A1 (en) * 1981-01-28 1982-08-04 Hitachi, Ltd. Current supply circuit
JPS59212068A (en) * 1983-05-17 1984-11-30 Sanken Electric Co Ltd Direct current feeding circuit
JPS60203061A (en) * 1984-03-28 1985-10-14 Nec Corp Electronic choke circuit

Also Published As

Publication number Publication date
JPS5930356B2 (en) 1984-07-26

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