JPS6451813A - Output voltage limit circuit - Google Patents

Output voltage limit circuit

Info

Publication number
JPS6451813A
JPS6451813A JP62208334A JP20833487A JPS6451813A JP S6451813 A JPS6451813 A JP S6451813A JP 62208334 A JP62208334 A JP 62208334A JP 20833487 A JP20833487 A JP 20833487A JP S6451813 A JPS6451813 A JP S6451813A
Authority
JP
Japan
Prior art keywords
reference voltage
operational amplifier
output voltage
impedance element
variable impedance
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
JP62208334A
Other languages
Japanese (ja)
Inventor
Kazumasa Aoki
Susumu Iguchi
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.)
Ricoh Co Ltd
Original Assignee
Ricoh 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP62208334A priority Critical patent/JPS6451813A/en
Publication of JPS6451813A publication Critical patent/JPS6451813A/en
Pending legal-status Critical Current

Links

Landscapes

  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
  • Manipulation Of Pulses (AREA)
  • Focusing (AREA)
  • Automatic Focus Adjustment (AREA)

Abstract

PURPOSE:To improve the reliability with inexpensive and simple configuration by providing a variable impedance element whose impedance is lowered when an output voltage of an operational amplifier exceeds a reference voltage. CONSTITUTION:A series branch comprising a variable impedance element 14 and a lower limit resistor R3 is connected in parallel with a feedback resistor R2 forming an inverse amplifier circuit together with the operational amplifier 10. A reference voltage generating circuit 15 outputs a reference voltage Vr to a connecting point P2 and when an output voltage Vo of the operational amplifier 10 exceeds the reference voltage Vr, the emitter potential of the TR Q1 forming the variable impedance element 14 is higher than the reference voltage fed to the base and the collector current is increased nearly proportional to the output voltage Vo, the closed loop gain of the operational amplifier 10 is reduced and the output voltage Vo is limited to the reference voltage Vr. Thus, the defect of the operational amplifier 10 due to a large current flowing is eliminated and the reliability is improved.
JP62208334A 1987-08-24 1987-08-24 Output voltage limit circuit Pending JPS6451813A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62208334A JPS6451813A (en) 1987-08-24 1987-08-24 Output voltage limit circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62208334A JPS6451813A (en) 1987-08-24 1987-08-24 Output voltage limit circuit

Publications (1)

Publication Number Publication Date
JPS6451813A true JPS6451813A (en) 1989-02-28

Family

ID=16554549

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62208334A Pending JPS6451813A (en) 1987-08-24 1987-08-24 Output voltage limit circuit

Country Status (1)

Country Link
JP (1) JPS6451813A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06104672A (en) * 1992-09-22 1994-04-15 Mitsubishi Electric Corp Clamp circuit
CN103413584A (en) * 2013-07-31 2013-11-27 中科华核电技术研究院有限公司 Microcurrent treating device for ex-core nuclear measurement system

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4896049A (en) * 1972-03-22 1973-12-08
JPS579114A (en) * 1980-06-20 1982-01-18 Fujitsu Ltd Limiter circuit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4896049A (en) * 1972-03-22 1973-12-08
JPS579114A (en) * 1980-06-20 1982-01-18 Fujitsu Ltd Limiter circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06104672A (en) * 1992-09-22 1994-04-15 Mitsubishi Electric Corp Clamp circuit
CN103413584A (en) * 2013-07-31 2013-11-27 中科华核电技术研究院有限公司 Microcurrent treating device for ex-core nuclear measurement system

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