JPS5678271A - Electric power source circuit of public telephone set - Google Patents

Electric power source circuit of public telephone set

Info

Publication number
JPS5678271A
JPS5678271A JP13531580A JP13531580A JPS5678271A JP S5678271 A JPS5678271 A JP S5678271A JP 13531580 A JP13531580 A JP 13531580A JP 13531580 A JP13531580 A JP 13531580A JP S5678271 A JPS5678271 A JP S5678271A
Authority
JP
Japan
Prior art keywords
circuits
electric power
load
voltages
capacitors
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
JP13531580A
Other languages
Japanese (ja)
Other versions
JPS6237863B2 (en
Inventor
Yoshiaki Takeda
Akio Hikone
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.)
Tamura Electric Works Ltd
Original Assignee
Tamura Electric Works 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 Tamura Electric Works Ltd filed Critical Tamura Electric Works Ltd
Priority to JP13531580A priority Critical patent/JPS5678271A/en
Publication of JPS5678271A publication Critical patent/JPS5678271A/en
Publication of JPS6237863B2 publication Critical patent/JPS6237863B2/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)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Devices For Supply Of Signal Current (AREA)

Abstract

PURPOSE:To stabilize the operation of all load circuits by providing reverse-current stopping diodes and capacitors corresponding to load circuits and by supplying across voltages of respective capacitors as electric power sources of load circuits. CONSTITUTION:Reverse-current stopping diodes D5-D8 and capacitors C1-C4 are provided corresponding to load circuits LD1-LD4 in a public telephone set and series circuits of D5-D8 and C1-C4 are connected in parallel to Zener diode ZD. By Zener voltage Vz of diode ZD, capacitors C1-C4 are charged via diodes D5- D8 and across voltages of C1-C4 are supplied to circuits LD1-LD4 as their electric power voltages V1-V4. Therefore, even if large load current flows to LD1, only the across voltage of capacitor C1 drops and across voltages of C2-C4 stay unchanged, so that the operation of circuits LD2-LD4 will be held stable. In addition, as each load finishes its operation, each capacitor is charged for the next operation.
JP13531580A 1980-09-30 1980-09-30 Electric power source circuit of public telephone set Granted JPS5678271A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13531580A JPS5678271A (en) 1980-09-30 1980-09-30 Electric power source circuit of public telephone set

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13531580A JPS5678271A (en) 1980-09-30 1980-09-30 Electric power source circuit of public telephone set

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP11741678A Division JPS581592B2 (en) 1978-09-26 1978-09-26 Local public telephone

Publications (2)

Publication Number Publication Date
JPS5678271A true JPS5678271A (en) 1981-06-27
JPS6237863B2 JPS6237863B2 (en) 1987-08-14

Family

ID=15148860

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13531580A Granted JPS5678271A (en) 1980-09-30 1980-09-30 Electric power source circuit of public telephone set

Country Status (1)

Country Link
JP (1) JPS5678271A (en)

Also Published As

Publication number Publication date
JPS6237863B2 (en) 1987-08-14

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