[go: up one dir, main page]

JPS57152761A - Control circuit for service loop of public telephone - Google Patents

Control circuit for service loop of public telephone

Info

Publication number
JPS57152761A
JPS57152761A JP3909581A JP3909581A JPS57152761A JP S57152761 A JPS57152761 A JP S57152761A JP 3909581 A JP3909581 A JP 3909581A JP 3909581 A JP3909581 A JP 3909581A JP S57152761 A JPS57152761 A JP S57152761A
Authority
JP
Japan
Prior art keywords
voltage
relay
service
capacitor
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.)
Granted
Application number
JP3909581A
Other languages
Japanese (ja)
Other versions
JPH0221188B2 (en
Inventor
Toshiyuki Kudo
Shigeyasu Tanaka
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.)
Anritsu Corp
Original Assignee
Anritsu 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 Anritsu Corp filed Critical Anritsu Corp
Priority to JP3909581A priority Critical patent/JPS57152761A/en
Publication of JPS57152761A publication Critical patent/JPS57152761A/en
Publication of JPH0221188B2 publication Critical patent/JPH0221188B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/08—Current supply arrangements for telephone systems with current supply sources at the substations

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Prepayment Telephone Systems (AREA)
  • Devices For Supply Of Signal Current (AREA)

Abstract

PURPOSE:To make the battery of a public telephone unnecessary, by storing a voltage, which is obtained through a service line, from the exchange of the offlce in a capacitor to operate a relay. CONSTITUTION:An exchange 2 and a pulbic telephone 1 are connected by service lines l1 and l2, and a DC voltage is charged to a capacitor 13 through a power supply circuit 12. In the service, a voltage monitor circuit 14 operates a relay RY through a relay control circuit 15 to close a contact RYS1 if the charging voltage of the capacitor is higher than the first reference level, and the circuit 14 connects a service circuit 11 to service lines l1 and l2. When the relay is operated, the voltage monitor circuit monitors the second reference voltage lower than the first reference voltage, and the relay RY is released when the charging voltage of the capacitor 13 is lower than the second reference voltage bacause of a fault or the like.
JP3909581A 1981-03-18 1981-03-18 Control circuit for service loop of public telephone Granted JPS57152761A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3909581A JPS57152761A (en) 1981-03-18 1981-03-18 Control circuit for service loop of public telephone

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3909581A JPS57152761A (en) 1981-03-18 1981-03-18 Control circuit for service loop of public telephone

Publications (2)

Publication Number Publication Date
JPS57152761A true JPS57152761A (en) 1982-09-21
JPH0221188B2 JPH0221188B2 (en) 1990-05-14

Family

ID=12543515

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3909581A Granted JPS57152761A (en) 1981-03-18 1981-03-18 Control circuit for service loop of public telephone

Country Status (1)

Country Link
JP (1) JPS57152761A (en)

Also Published As

Publication number Publication date
JPH0221188B2 (en) 1990-05-14

Similar Documents

Publication Publication Date Title
JPH0112517Y2 (en)
TW351870B (en) Battery charging circuit
MY109713A (en) Fail-safe uninterruptible lightning system
MY109742A (en) Battery charging and discharging system and corresponding method.
MY116704A (en) Battery charger with low standby current
JPS6486739A (en) Car telephone equipment
CA1080866A (en) Line conditioning and transfer circuit
MX9500295A (en) Method and circuit for mantaining charge in a backup battery.
JPS57152761A (en) Control circuit for service loop of public telephone
JPS6450723A (en) Solar power generator
JPS5467651A (en) No interruption power supply apparatus
PL311692A1 (en) Method of and apparatus for charging lead-acid storage batteries
JPS5757035A (en) Radio device
JPS6485539A (en) Back-up power circuit
JPS6478948A (en) Power supply for car
JP2001069687A (en) Energy-saving power supply
JPS5732427A (en) Camera circuit
JPS56117443A (en) Car telephone set with solar battery
JPS57194648A (en) Office information monitoring and recording device
JPS6469226A (en) No-break power unit
EP0451110A3 (en)
JPS645331A (en) Alarm for excluding operation of charger
JPS6423657A (en) Dial circuit power source supplying system
JPS54157241A (en) Interruption-free power source system
JPS6477427A (en) Received power controller