JPS5696307A - Constant-current circuit - Google Patents

Constant-current circuit

Info

Publication number
JPS5696307A
JPS5696307A JP17279879A JP17279879A JPS5696307A JP S5696307 A JPS5696307 A JP S5696307A JP 17279879 A JP17279879 A JP 17279879A JP 17279879 A JP17279879 A JP 17279879A JP S5696307 A JPS5696307 A JP S5696307A
Authority
JP
Japan
Prior art keywords
amplifier
output
load
supplied
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.)
Pending
Application number
JP17279879A
Other languages
Japanese (ja)
Inventor
Yoshihiro Hirata
Hiroshi Uchiumi
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.)
Jeol Ltd
Original Assignee
Jeol Ltd
Nihon Denshi KK
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 Jeol Ltd, Nihon Denshi KK filed Critical Jeol Ltd
Priority to JP17279879A priority Critical patent/JPS5696307A/en
Publication of JPS5696307A publication Critical patent/JPS5696307A/en
Pending legal-status Critical Current

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  • Continuous-Control Power Sources That Use Transistors (AREA)

Abstract

PURPOSE: To supply a constant current, where the frequency response is good and the error can be ignored, to the load, by supplying the output of the first amplifier out of equal operational amplifiers to the positive input of the second amplifier and supplying the output of the second amplifier to the load and the positive input of the first amplifier.
CONSTITUTION: Operational amplifiers 7 and 8 having equal positive and negative input voltages and output voltages are provided, and the output of amplifier 8 is supplied to the positive input of amplifier 7 through resistance R9, and the voltage from voltage source 6 is supplied to the negative input of amplifier 7 through resistance R7. The output of amplifier 7 is supplied to load L and the positive input of amplifier 8 through resistance R5 and is supplied to its own negative input through resistance R6, and the positive input is grounded through resistance R8. The output of amplifier 8 is connected to its own negative input. If resistances R6 and R7 are set equal to each other and resistances R8 and R9 are set equal to each other, the voltage of output terminal Q3 of amplifier 7 becomes equal to the sum of voltage EA from voltage source 6 and the voltage to input point Q2 to load L. Consequently, a constant current equal to -EA/R5 is flowed to load L, and the error due to temperature change does not exist, and a good-response constant current is supplied to the load because the frequency response is determined by amplification.
COPYRIGHT: (C)1981,JPO&Japio
JP17279879A 1979-12-28 1979-12-28 Constant-current circuit Pending JPS5696307A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17279879A JPS5696307A (en) 1979-12-28 1979-12-28 Constant-current circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17279879A JPS5696307A (en) 1979-12-28 1979-12-28 Constant-current circuit

Publications (1)

Publication Number Publication Date
JPS5696307A true JPS5696307A (en) 1981-08-04

Family

ID=15948553

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17279879A Pending JPS5696307A (en) 1979-12-28 1979-12-28 Constant-current circuit

Country Status (1)

Country Link
JP (1) JPS5696307A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7391192B2 (en) 2000-08-31 2008-06-24 Primarion, Inc. Apparatus and system for providing transient suppression power regulation
JP2019215976A (en) * 2018-06-12 2019-12-19 株式会社日立ハイテクノロジーズ Charged particle beam control apparatus

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49112150A (en) * 1973-02-27 1974-10-25

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49112150A (en) * 1973-02-27 1974-10-25

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7391192B2 (en) 2000-08-31 2008-06-24 Primarion, Inc. Apparatus and system for providing transient suppression power regulation
US7616456B2 (en) 2000-08-31 2009-11-10 Primarion Corporation Apparatus and system for providing transient suppression power regulation
JP2019215976A (en) * 2018-06-12 2019-12-19 株式会社日立ハイテクノロジーズ Charged particle beam control apparatus

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