JPS5720822A - Voltage-to-current converting circuit - Google Patents

Voltage-to-current converting circuit

Info

Publication number
JPS5720822A
JPS5720822A JP9574980A JP9574980A JPS5720822A JP S5720822 A JPS5720822 A JP S5720822A JP 9574980 A JP9574980 A JP 9574980A JP 9574980 A JP9574980 A JP 9574980A JP S5720822 A JPS5720822 A JP S5720822A
Authority
JP
Japan
Prior art keywords
voltage
base
amplifier
current
operational amplifier
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
JP9574980A
Other languages
Japanese (ja)
Inventor
Takateru Nakazawa
Shoji Matsuda
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 JP9574980A priority Critical patent/JPS5720822A/en
Publication of JPS5720822A publication Critical patent/JPS5720822A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/52—Circuit arrangements for protecting such amplifiers

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Continuous-Control Power Sources That Use Transistors (AREA)

Abstract

PURPOSE:To protect an operational amplifier, by adding a transistor (TR) to the base of the TR that controls the current in order to apply the voltage when the operational amplifier has an overcurrent. CONSTITUTION:In case when the output current of an operational amplifier 1 increases owing to disconnection, etc. of an external load resistance 8, the base- emitter voltage of the 2nd TR12 increases to reach a certain value. Thus a sufficient biss is secured between the base and the emitter of the TR12 to turn on the TR12. As a result, a voltage VCC is applied to the base of the TR12 via a resistance 9, and accordingly a negative feedback is applied to the amplifier 1. Then the current is limited before the amplifier 1 has a saturation to reduce the loss of the amplifier 1.
JP9574980A 1980-07-15 1980-07-15 Voltage-to-current converting circuit Pending JPS5720822A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9574980A JPS5720822A (en) 1980-07-15 1980-07-15 Voltage-to-current converting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9574980A JPS5720822A (en) 1980-07-15 1980-07-15 Voltage-to-current converting circuit

Publications (1)

Publication Number Publication Date
JPS5720822A true JPS5720822A (en) 1982-02-03

Family

ID=14146138

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9574980A Pending JPS5720822A (en) 1980-07-15 1980-07-15 Voltage-to-current converting circuit

Country Status (1)

Country Link
JP (1) JPS5720822A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63299069A (en) * 1987-05-29 1988-12-06 Yamato Scient Co Ltd Heater control device for extremely high-temperature electric furnace

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63299069A (en) * 1987-05-29 1988-12-06 Yamato Scient Co Ltd Heater control device for extremely high-temperature electric furnace

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