JPS56117469A - Control system for current supply circuit - Google Patents

Control system for current supply circuit

Info

Publication number
JPS56117469A
JPS56117469A JP2059280A JP2059280A JPS56117469A JP S56117469 A JPS56117469 A JP S56117469A JP 2059280 A JP2059280 A JP 2059280A JP 2059280 A JP2059280 A JP 2059280A JP S56117469 A JPS56117469 A JP S56117469A
Authority
JP
Japan
Prior art keywords
circuit
turned
current supply
supply circuit
current
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
JP2059280A
Other languages
Japanese (ja)
Other versions
JPS5944832B2 (en
Inventor
Shige Miyoshi
Ryoichi Okada
Takehiko Tsutsumi
Junji Asakura
Hiroshi Shinkawa
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 JP55020592A priority Critical patent/JPS5944832B2/en
Publication of JPS56117469A publication Critical patent/JPS56117469A/en
Publication of JPS5944832B2 publication Critical patent/JPS5944832B2/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 ensure a simple and economical control without impairing the function of current supply circuit, by providing a switch circuit in parallel to the input power source of an input current supply circuit and then making a short circuit to the input power source when the current supply circuit is turned to off. CONSTITUTION:The control terminal CTL is opened or the battery E is added to the terminal CTL, the transistors Q5 and Q7 of the switch circuit 5' are turned off. As a result, the Darlington-connection transistors Q1, Q2, Q1' and Q2' are turned to on to supply the current to the load. Then the Q5 and Q7 are turned to on with application of the earth to the terminal CTL. As a result, the voltage applied to the input current supply circuit 4 is limited by the collector-emitter saturation voltage of the Q5. Thus the Darlington-connection transistors are turned to off to cut off the load current. With use of the circuit mentioned above, a control is facilitated for the circuit that supplies the call current to the trunk of the other side in a telephone exchange.
JP55020592A 1980-02-22 1980-02-22 Current supply circuit control method Expired JPS5944832B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55020592A JPS5944832B2 (en) 1980-02-22 1980-02-22 Current supply circuit control method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55020592A JPS5944832B2 (en) 1980-02-22 1980-02-22 Current supply circuit control method

Publications (2)

Publication Number Publication Date
JPS56117469A true JPS56117469A (en) 1981-09-14
JPS5944832B2 JPS5944832B2 (en) 1984-11-01

Family

ID=12031512

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55020592A Expired JPS5944832B2 (en) 1980-02-22 1980-02-22 Current supply circuit control method

Country Status (1)

Country Link
JP (1) JPS5944832B2 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60179736U (en) * 1984-05-10 1985-11-29 株式会社アイジー技術研究所 siding board
JPS60179735U (en) * 1984-05-10 1985-11-29 株式会社アイジー技術研究所 siding board
JPH032591Y2 (en) * 1984-10-01 1991-01-24
JPS63147040A (en) * 1986-12-09 1988-06-20 鐘淵化学工業株式会社 Exterior construction method of building

Also Published As

Publication number Publication date
JPS5944832B2 (en) 1984-11-01

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