JPS55688A - Power interruption supervisory circuit for key telephone unit - Google Patents

Power interruption supervisory circuit for key telephone unit

Info

Publication number
JPS55688A
JPS55688A JP5351579A JP5351579A JPS55688A JP S55688 A JPS55688 A JP S55688A JP 5351579 A JP5351579 A JP 5351579A JP 5351579 A JP5351579 A JP 5351579A JP S55688 A JPS55688 A JP S55688A
Authority
JP
Japan
Prior art keywords
relay
power
power interruption
secondary winding
loop
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
JP5351579A
Other languages
Japanese (ja)
Inventor
Minoru Sasai
Yasuhisa Kobayashi
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.)
Kanda Tsushin Kogyo Co Ltd
Original Assignee
Kanda Tsushin Kogyo 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 Kanda Tsushin Kogyo Co Ltd filed Critical Kanda Tsushin Kogyo Co Ltd
Priority to JP5351579A priority Critical patent/JPS55688A/en
Publication of JPS55688A publication Critical patent/JPS55688A/en
Pending 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)

Abstract

PURPOSE:To obtain a low-cost device which can prevent the loop break of the telephone circuit when the power is transmitted again with just one unit of the power interruption supervisory relay. CONSTITUTION:When relay Y is released with the power interruption, contact y<2> is also released. As a result, the current flows to secondary winding S of relay Y in that loop of the earth - hook switch contact Hs - contact y<2> - secondary winding S - the circuit of power supply E even with the retransmission of the power as long as the handset of key telephone TEL is picked up. Accordingly, the current flowing to primary winding P and secondary winding S of relay Y feature the opposite direction to each other, and thus no magnetic flux is caused to relay Y and thus no operation given to relay Y. As a result, the same state as the power interruption is continued even with retransmission of the power, thus realizing continuation of the talking state without cutting off the loop of the telephone circuit.
JP5351579A 1979-05-02 1979-05-02 Power interruption supervisory circuit for key telephone unit Pending JPS55688A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5351579A JPS55688A (en) 1979-05-02 1979-05-02 Power interruption supervisory circuit for key telephone unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5351579A JPS55688A (en) 1979-05-02 1979-05-02 Power interruption supervisory circuit for key telephone unit

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP9072275A Division JPS5215205A (en) 1975-07-26 1975-07-26 Power failure monitor circuit for key telephone system

Publications (1)

Publication Number Publication Date
JPS55688A true JPS55688A (en) 1980-01-07

Family

ID=12944950

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5351579A Pending JPS55688A (en) 1979-05-02 1979-05-02 Power interruption supervisory circuit for key telephone unit

Country Status (1)

Country Link
JP (1) JPS55688A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5835609U (en) * 1981-08-31 1983-03-08 株式会社　土屋製作所 Engine oil level warning device
JPS5835610U (en) * 1981-08-31 1983-03-08 株式会社土屋製作所 Engine oil level warning device
JPS60141521U (en) * 1984-02-29 1985-09-19 株式会社　土屋製作所 Oil level gauge with warning device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5434643A (en) * 1977-06-30 1979-03-14 Ibm High speed discrite fourier conversion computer system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5434643A (en) * 1977-06-30 1979-03-14 Ibm High speed discrite fourier conversion computer system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5835609U (en) * 1981-08-31 1983-03-08 株式会社　土屋製作所 Engine oil level warning device
JPS5835610U (en) * 1981-08-31 1983-03-08 株式会社土屋製作所 Engine oil level warning device
JPS60141521U (en) * 1984-02-29 1985-09-19 株式会社　土屋製作所 Oil level gauge with warning device
JPH0447624Y2 (en) * 1984-02-29 1992-11-10

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