JPS57203115A - Constant current circuit - Google Patents

Constant current circuit

Info

Publication number
JPS57203115A
JPS57203115A JP8868781A JP8868781A JPS57203115A JP S57203115 A JPS57203115 A JP S57203115A JP 8868781 A JP8868781 A JP 8868781A JP 8868781 A JP8868781 A JP 8868781A JP S57203115 A JPS57203115 A JP S57203115A
Authority
JP
Japan
Prior art keywords
current
resistor
voltage
increased
point
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
JP8868781A
Other languages
Japanese (ja)
Inventor
Mitsuharu Kato
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.)
Denso Corp
Original Assignee
NipponDenso Co 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 NipponDenso Co Ltd filed Critical NipponDenso Co Ltd
Priority to JP8868781A priority Critical patent/JPS57203115A/en
Publication of JPS57203115A publication Critical patent/JPS57203115A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current
    • G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
    • G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
    • G05F1/561—Voltage to current converters

Abstract

PURPOSE:To obtain a constant current with stable operation simply, by setting an offset voltage to a differential amplifier and comparing a potential difference generated across a current detecting resistor. CONSTITUTION:An MOS transistor TR12 for voltage controlling and a registor 13 for current detection are connected in series with an input terminal 11 and another end of the resistor 13 is grounded, where a current flowing to a point C and a point A is represented respectively as IA and IC, Rs represent a resistance value of the resistor 13, and potentials across the resistor 13 are represented respectively as VA and VB. When a voltage Vc at a point C is increased, the current Ic is increased and since the resistance value Rs of the resistor 13 is constant, the potential difference VA-VB>1 is obtained. Thus, an output voltage VD of an amplifier 14 goes to L level to increase the impedance of the TR12 and to decrease the current IC. Inversely, when the voltage VC drops, VA-VB<1 is obtained, the impedance of the TR12 is lowered, and the current IC is increased. Thus, the constant current control can be exercised.
JP8868781A 1981-06-09 1981-06-09 Constant current circuit Pending JPS57203115A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8868781A JPS57203115A (en) 1981-06-09 1981-06-09 Constant current circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8868781A JPS57203115A (en) 1981-06-09 1981-06-09 Constant current circuit

Publications (1)

Publication Number Publication Date
JPS57203115A true JPS57203115A (en) 1982-12-13

Family

ID=13949744

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8868781A Pending JPS57203115A (en) 1981-06-09 1981-06-09 Constant current circuit

Country Status (1)

Country Link
JP (1) JPS57203115A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014117602A1 (en) * 2013-01-30 2014-08-07 中兴通讯股份有限公司 Constant current loop
JPWO2021049434A1 (en) * 2019-09-11 2021-12-23 富士電機株式会社 Current generation circuit, drive circuit and current adjustment method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014117602A1 (en) * 2013-01-30 2014-08-07 中兴通讯股份有限公司 Constant current loop
JPWO2021049434A1 (en) * 2019-09-11 2021-12-23 富士電機株式会社 Current generation circuit, drive circuit and current adjustment method
US11513546B2 (en) 2019-09-11 2022-11-29 Fuji Electric Co., Ltd. Current generation circuit, drive circuit, and current adjustment method

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