JPS5786766A - Level detecting device - Google Patents

Level detecting device

Info

Publication number
JPS5786766A
JPS5786766A JP16415580A JP16415580A JPS5786766A JP S5786766 A JPS5786766 A JP S5786766A JP 16415580 A JP16415580 A JP 16415580A JP 16415580 A JP16415580 A JP 16415580A JP S5786766 A JPS5786766 A JP S5786766A
Authority
JP
Japan
Prior art keywords
level
signal
period
voltage
input
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.)
Granted
Application number
JP16415580A
Other languages
Japanese (ja)
Other versions
JPH0352583B2 (en
Inventor
Yasuaki Miyake
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP16415580A priority Critical patent/JPS5786766A/en
Publication of JPS5786766A publication Critical patent/JPS5786766A/en
Publication of JPH0352583B2 publication Critical patent/JPH0352583B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
    • G01R19/16576—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing DC or AC voltage with one threshold
    • G01R19/1658—AC voltage or recurrent signals

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

PURPOSE:To make it possible to detect the level of a frequency stably even if the frequency changes by detecting the level of an object to be detected from the ratio of a period of time during which input voltage exceeds a specified value and a period of time during which input voltage stays below a specified value. CONSTITUTION:Alternating current V is input into a level division circuit 5 through a full wave rectifying circuit 1, and it becomes a signal 5a which is high during the period of time in which the voltage exceeds VL and is low during the period of time in which the voltage does not go over VL. This signal 5a is integrated by an integrator 6 during the period of low and the integrated output 6a is supplied to a judgement circuit 7. When the level of the input is small, the signal 6a partially exceeds the voltage VRe of return level of the judgement circuit 7, but does not reach its operation level VOp with the signal staying low. On the other hand, when input level is large, the signal 6a sometimes goes over the voltage VOp and the judgement circuit 7 outputs high signal 7a. In this way it becomes possible to make detection level unchanged by the frequency of an object to be detected.
JP16415580A 1980-11-20 1980-11-20 Level detecting device Granted JPS5786766A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16415580A JPS5786766A (en) 1980-11-20 1980-11-20 Level detecting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16415580A JPS5786766A (en) 1980-11-20 1980-11-20 Level detecting device

Publications (2)

Publication Number Publication Date
JPS5786766A true JPS5786766A (en) 1982-05-29
JPH0352583B2 JPH0352583B2 (en) 1991-08-12

Family

ID=15787778

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16415580A Granted JPS5786766A (en) 1980-11-20 1980-11-20 Level detecting device

Country Status (1)

Country Link
JP (1) JPS5786766A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0286282A2 (en) * 1987-03-27 1988-10-12 Fuji Electrochemical Co.Ltd. Method for detecting input ac voltage
JPS63292717A (en) * 1987-05-25 1988-11-30 Olympus Optical Co Ltd Integration level adjusting device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS512978U (en) * 1974-06-21 1976-01-10
JPS5134707U (en) * 1974-09-06 1976-03-15
JPS5136158A (en) * 1974-07-19 1976-03-26 Siemens Ag Sokuteiryosuiino kirokusochi
JPS5516487A (en) * 1978-07-24 1980-02-05 Toshiba Corp Superconductive equipment

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS512978U (en) * 1974-06-21 1976-01-10
JPS5136158A (en) * 1974-07-19 1976-03-26 Siemens Ag Sokuteiryosuiino kirokusochi
JPS5134707U (en) * 1974-09-06 1976-03-15
JPS5516487A (en) * 1978-07-24 1980-02-05 Toshiba Corp Superconductive equipment

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0286282A2 (en) * 1987-03-27 1988-10-12 Fuji Electrochemical Co.Ltd. Method for detecting input ac voltage
JPS63292717A (en) * 1987-05-25 1988-11-30 Olympus Optical Co Ltd Integration level adjusting device
JP2665335B2 (en) * 1987-05-25 1997-10-22 オリンパス光学工業株式会社 Integral level adjuster

Also Published As

Publication number Publication date
JPH0352583B2 (en) 1991-08-12

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