JPS564970A - Electric power source circuit - Google Patents

Electric power source circuit

Info

Publication number
JPS564970A
JPS564970A JP8018579A JP8018579A JPS564970A JP S564970 A JPS564970 A JP S564970A JP 8018579 A JP8018579 A JP 8018579A JP 8018579 A JP8018579 A JP 8018579A JP S564970 A JPS564970 A JP S564970A
Authority
JP
Japan
Prior art keywords
circuit
constant
voltage
terminal
resistance
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
JP8018579A
Other languages
Japanese (ja)
Other versions
JPS6013632B2 (en
Inventor
Ryoichi Abe
Akihisa Ueda
Ryoichi Uchiyama
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
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP8018579A priority Critical patent/JPS6013632B2/en
Publication of JPS564970A publication Critical patent/JPS564970A/en
Publication of JPS6013632B2 publication Critical patent/JPS6013632B2/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

PURPOSE:To obtain an electric power source for terminal drive from a constant voltage circuit while allowing the DC terminal of a circuit to serve as a constant- resistance terminal viewed equivalently from the circuit, by using a combined circuit of a constant-current circuit, constant-voltage circuit and resistor. CONSTITUTION:Constant-current circuit 5-1 is connected in parallel to the series circuit of terminal resistance 5-2 and constant-voltage electric power source 5-3 to form electric power source circuit 5. This circuit 5, when a DC voltage applied between input terminals 4-1 and 4-2 is large enough for the operation of circuits 5-1 and 5-3 or greater than it, becomes equivalent to terminal resistance 5-2 by being viewed from input terminal 4-1 and 4-2 sides. Further, this circuit 5 serves as a resistance and constant-voltage circuit 5-3 can supply constant voltage out. However, the ratio of voltage V0, generated by constant-voltage circuit 5-3, to constant current I0 flowing through constant-current circuit 5-1 should be set equal to resistance value R0 of terminal resistance 5-2.
JP8018579A 1979-06-27 1979-06-27 power circuit Expired JPS6013632B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8018579A JPS6013632B2 (en) 1979-06-27 1979-06-27 power circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8018579A JPS6013632B2 (en) 1979-06-27 1979-06-27 power circuit

Publications (2)

Publication Number Publication Date
JPS564970A true JPS564970A (en) 1981-01-19
JPS6013632B2 JPS6013632B2 (en) 1985-04-08

Family

ID=13711300

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8018579A Expired JPS6013632B2 (en) 1979-06-27 1979-06-27 power circuit

Country Status (1)

Country Link
JP (1) JPS6013632B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59112440A (en) * 1982-12-18 1984-06-28 Akai Electric Co Ltd Optical sensor for three-beam type optical pickup

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59112440A (en) * 1982-12-18 1984-06-28 Akai Electric Co Ltd Optical sensor for three-beam type optical pickup

Also Published As

Publication number Publication date
JPS6013632B2 (en) 1985-04-08

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