JPS56103718A - Constant current circuit - Google Patents

Constant current circuit

Info

Publication number
JPS56103718A
JPS56103718A JP570080A JP570080A JPS56103718A JP S56103718 A JPS56103718 A JP S56103718A JP 570080 A JP570080 A JP 570080A JP 570080 A JP570080 A JP 570080A JP S56103718 A JPS56103718 A JP S56103718A
Authority
JP
Japan
Prior art keywords
constant current
current circuit
transistors
common
minute
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
JP570080A
Other languages
Japanese (ja)
Inventor
Shinichi Kojima
Kunio Seki
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 JP570080A priority Critical patent/JPS56103718A/en
Publication of JPS56103718A publication Critical patent/JPS56103718A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F3/00—Non-retroactive systems for regulating electric variables by using an uncontrolled element, or an uncontrolled combination of elements, such element or such combination having self-regulating properties
    • G05F3/02—Regulating voltage or current
    • G05F3/08—Regulating voltage or current wherein the variable is dc
    • G05F3/10—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics
    • G05F3/16—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics being semiconductor devices
    • G05F3/20—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics being semiconductor devices using diode- transistor combinations
    • G05F3/30—Regulators using the difference between the base-emitter voltages of two bipolar transistors operating at different current densities

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Power Engineering (AREA)
  • Nonlinear Science (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Control Of Electrical Variables (AREA)

Abstract

PURPOSE:To enable to build up a minute constant current with high accuracy, by distributing the constant current formed with resistances into a plurality of transistors. CONSTITUTION:A load resistance R1 is connected to series diodes D1, D2 to form a forward constant voltage 2VF, which is applied to the base of transistors Q1, Q2 in common. Further, a resistance R2 forming a constant current taking the emitter of Q1, Q2 as common is provided. Further, the constant current formed with R2 is distributed into Q1 and Q2 to form minute constant current.
JP570080A 1980-01-23 1980-01-23 Constant current circuit Pending JPS56103718A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP570080A JPS56103718A (en) 1980-01-23 1980-01-23 Constant current circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP570080A JPS56103718A (en) 1980-01-23 1980-01-23 Constant current circuit

Publications (1)

Publication Number Publication Date
JPS56103718A true JPS56103718A (en) 1981-08-19

Family

ID=11618373

Family Applications (1)

Application Number Title Priority Date Filing Date
JP570080A Pending JPS56103718A (en) 1980-01-23 1980-01-23 Constant current circuit

Country Status (1)

Country Link
JP (1) JPS56103718A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62259118A (en) * 1986-05-06 1987-11-11 Matsushita Electric Ind Co Ltd Constant current source circuit
JPH0221625U (en) * 1988-07-27 1990-02-14

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62259118A (en) * 1986-05-06 1987-11-11 Matsushita Electric Ind Co Ltd Constant current source circuit
JPH0221625U (en) * 1988-07-27 1990-02-14

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