JPS5450207A - Current supply circuit - Google Patents

Current supply circuit

Info

Publication number
JPS5450207A
JPS5450207A JP11555877A JP11555877A JPS5450207A JP S5450207 A JPS5450207 A JP S5450207A JP 11555877 A JP11555877 A JP 11555877A JP 11555877 A JP11555877 A JP 11555877A JP S5450207 A JPS5450207 A JP S5450207A
Authority
JP
Japan
Prior art keywords
current
supplied
voltage
supply circuit
control 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.)
Pending
Application number
JP11555877A
Other languages
Japanese (ja)
Inventor
Takuji Mukaemachi
Akira Kikuchi
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.)
Hitachi Ltd
Nippon Telegraph and Telephone Corp
Original Assignee
Hitachi Ltd
Nippon Telegraph and Telephone Corp
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 Hitachi Ltd, Nippon Telegraph and Telephone Corp filed Critical Hitachi Ltd
Priority to JP11555877A priority Critical patent/JPS5450207A/en
Publication of JPS5450207A publication Critical patent/JPS5450207A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Interface Circuits In Exchanges (AREA)

Abstract

PURPOSE:To prevent reactive power generation with supplying the current by a minimum required voltage, by adjusting automatically the voltage of a DC voltage supply according to the resistance of a subscriber line. CONSTITUTION:When telephone set 1 and current supply circuit 3 are connected through cross point switch 2 of the network, control pulses are supplied from control circuit 19 to SCRs 13 and 14, and the output of AC power source 18 is rectified and smoothed through transformer 17, and the current is supplied to the telephone set. Then, the current value is fed back to control circuit 19 by LED10 and photo- detector 20 and is so controlled that the current may be always fixed by delaying or advancing the phase in case of the current larger or smaller than the set value respectively. As a result, a minimum required and sufficient current can be supplied by minimum DC output voltage corresponding to the line resistance.
JP11555877A 1977-09-28 1977-09-28 Current supply circuit Pending JPS5450207A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11555877A JPS5450207A (en) 1977-09-28 1977-09-28 Current supply circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11555877A JPS5450207A (en) 1977-09-28 1977-09-28 Current supply circuit

Publications (1)

Publication Number Publication Date
JPS5450207A true JPS5450207A (en) 1979-04-20

Family

ID=14665505

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11555877A Pending JPS5450207A (en) 1977-09-28 1977-09-28 Current supply circuit

Country Status (1)

Country Link
JP (1) JPS5450207A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0495095U (en) * 1990-12-28 1992-08-18

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0495095U (en) * 1990-12-28 1992-08-18

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