JPS57139612A - Capacitance type converter - Google Patents

Capacitance type converter

Info

Publication number
JPS57139612A
JPS57139612A JP2575281A JP2575281A JPS57139612A JP S57139612 A JPS57139612 A JP S57139612A JP 2575281 A JP2575281 A JP 2575281A JP 2575281 A JP2575281 A JP 2575281A JP S57139612 A JPS57139612 A JP S57139612A
Authority
JP
Japan
Prior art keywords
voltage
pressure
output
linearity
comparator
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
JP2575281A
Other languages
Japanese (ja)
Other versions
JPH0216450B2 (en
Inventor
Terutaka Hirata
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.)
Yokogawa Electric Corp
Original Assignee
Yokogawa Electric Corp
Yokogawa Hokushin Electric Corp
Yokogawa Electric Works 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 Yokogawa Electric Corp, Yokogawa Hokushin Electric Corp, Yokogawa Electric Works Ltd filed Critical Yokogawa Electric Corp
Priority to JP2575281A priority Critical patent/JPS57139612A/en
Publication of JPS57139612A publication Critical patent/JPS57139612A/en
Publication of JPH0216450B2 publication Critical patent/JPH0216450B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/24—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance
    • G01D5/241—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance by relative movement of capacitor electrodes
    • G01D5/2417—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance by relative movement of capacitor electrodes by varying separation

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)

Abstract

PURPOSE:To compensate non-linearity of the converter output by a method wherein a variable capacitor C1 whose capacity changes according to the measured quantity such as pressure or pressure difference and a fixed capacitor are charged and discharged, so that the pulse width signal of the frequency corresponding to the sum of both capacitors is generated and used. CONSTITUTION:A variable capacitor C1 whose capacity changes according to the measured quantity such as pressure and a fixed capacitor C2 are provided. C1 and C2 are connected to an operating amplifier OP and a comparator CO via switches SW1 and SW2. The comparator CO has hysteresis characteristics and drives SW3 by the pulse width voltage SW of the frequency corresponding to the sum of C1 and C2 which is generated by charging and discharging C1 and C2. Standard voltages -ES2 and +ES1 are switched 3 and the output voltage EO is obtained from an amplifier AMP through a filter circuit FC and at the same time a feedback circuit which has a coefficient multiplier which multiplies EO by k is provided. With this constitution, the non-linearity of the output EO can be compensated by selecting suitable value of coefficient k. And the voltage ES2 can be eliminated by selecting suitable value of C2.
JP2575281A 1981-02-24 1981-02-24 Capacitance type converter Granted JPS57139612A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2575281A JPS57139612A (en) 1981-02-24 1981-02-24 Capacitance type converter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2575281A JPS57139612A (en) 1981-02-24 1981-02-24 Capacitance type converter

Publications (2)

Publication Number Publication Date
JPS57139612A true JPS57139612A (en) 1982-08-28
JPH0216450B2 JPH0216450B2 (en) 1990-04-17

Family

ID=12174559

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2575281A Granted JPS57139612A (en) 1981-02-24 1981-02-24 Capacitance type converter

Country Status (1)

Country Link
JP (1) JPS57139612A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4891267A (en) * 1985-12-16 1990-01-02 Toho Rayon Co., Ltd. Carbon fiber cord for rubber reinforcement and process for producing the same
FR2920534A1 (en) * 2007-12-14 2009-03-06 Siemens Vdo Automotive Sas Position sensor for e.g. clutch pedal, of motor vehicle, has control unit moved along stroke in which state of all-or-nothing signal changes for stroke value when unit is moved in opposed direction from zero to hundred percentage positions

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5161864A (en) * 1974-11-25 1976-05-28 Shimadzu Corp Seidenyoryo chokuryudenatsuhenkansochi
JPS5252676A (en) * 1975-10-24 1977-04-27 Yokogawa Hokushin Electric Corp Capacity-to-electricity converter
JPS55159109A (en) * 1979-05-30 1980-12-11 Yokogawa Hokushin Electric Corp Capacity type displacement converter

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5161864A (en) * 1974-11-25 1976-05-28 Shimadzu Corp Seidenyoryo chokuryudenatsuhenkansochi
JPS5252676A (en) * 1975-10-24 1977-04-27 Yokogawa Hokushin Electric Corp Capacity-to-electricity converter
JPS55159109A (en) * 1979-05-30 1980-12-11 Yokogawa Hokushin Electric Corp Capacity type displacement converter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4891267A (en) * 1985-12-16 1990-01-02 Toho Rayon Co., Ltd. Carbon fiber cord for rubber reinforcement and process for producing the same
FR2920534A1 (en) * 2007-12-14 2009-03-06 Siemens Vdo Automotive Sas Position sensor for e.g. clutch pedal, of motor vehicle, has control unit moved along stroke in which state of all-or-nothing signal changes for stroke value when unit is moved in opposed direction from zero to hundred percentage positions

Also Published As

Publication number Publication date
JPH0216450B2 (en) 1990-04-17

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