JPS564877A - Logarithmic conversion circuit for resistance variable sensor - Google Patents

Logarithmic conversion circuit for resistance variable sensor

Info

Publication number
JPS564877A
JPS564877A JP7981879A JP7981879A JPS564877A JP S564877 A JPS564877 A JP S564877A JP 7981879 A JP7981879 A JP 7981879A JP 7981879 A JP7981879 A JP 7981879A JP S564877 A JPS564877 A JP S564877A
Authority
JP
Japan
Prior art keywords
voltage
resistor
change
transistor
sensor
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
JP7981879A
Other languages
Japanese (ja)
Other versions
JPS5947356B2 (en
Inventor
Susumu Takagi
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 Ten Ltd
Original Assignee
Denso Ten 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 Denso Ten Ltd filed Critical Denso Ten Ltd
Priority to JP54079818A priority Critical patent/JPS5947356B2/en
Publication of JPS564877A publication Critical patent/JPS564877A/en
Publication of JPS5947356B2 publication Critical patent/JPS5947356B2/en
Expired legal-status Critical Current

Links

Landscapes

  • Indication And Recording Devices For Special Purposes And Tariff Metering Devices (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)

Abstract

PURPOSE:To change the resistance change of the sensor in which the resistance value changes expotentially into the logarithmic value with good precision, by connecting the silicon diode in series with the resistance variable sensor and detecting the forward voltage of the silicon diode. CONSTITUTION:The silicon diode D1 is connected in series with the sensor Rtheta the resistance value of which is expotentially changed according to the physical change such as temperature change, a voltage is applied from the constant voltage power supply E1, the forward voltage of the diode D1 is input to one input terminal of the operational amplifier A1, resistor R1, transistor TR1 and resistor R2 are connected to the power supply E1, the voltage at the connection point P3 between the resistor R1 and the transistor TR1 is fed to another input terminal of the operational amplifier A1, the output of the operational amplifier is fed back to the base of the transistor TR1, temperature compensation circuit Tc is provided between the resistor R2 and ground, and the potential of the connection point P3 is taken as the output voltage.
JP54079818A 1979-06-25 1979-06-25 Logarithmic conversion circuit for resistance change sensor Expired JPS5947356B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP54079818A JPS5947356B2 (en) 1979-06-25 1979-06-25 Logarithmic conversion circuit for resistance change sensor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP54079818A JPS5947356B2 (en) 1979-06-25 1979-06-25 Logarithmic conversion circuit for resistance change sensor

Publications (2)

Publication Number Publication Date
JPS564877A true JPS564877A (en) 1981-01-19
JPS5947356B2 JPS5947356B2 (en) 1984-11-19

Family

ID=13700778

Family Applications (1)

Application Number Title Priority Date Filing Date
JP54079818A Expired JPS5947356B2 (en) 1979-06-25 1979-06-25 Logarithmic conversion circuit for resistance change sensor

Country Status (1)

Country Link
JP (1) JPS5947356B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5013217A (en) * 1988-01-29 1991-05-07 Kabushiki Kaisha Toshiba Compressing apparatus with extended variable capacity range and capacity control method thereof
US5050233A (en) * 1987-08-31 1991-09-17 Kabushiki Kaisha Toshiba Rotary compressor
JPH0540848U (en) * 1991-11-05 1993-06-01 日本電子機器株式会社 Magnetostrictive torque sensor

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5050233A (en) * 1987-08-31 1991-09-17 Kabushiki Kaisha Toshiba Rotary compressor
US5013217A (en) * 1988-01-29 1991-05-07 Kabushiki Kaisha Toshiba Compressing apparatus with extended variable capacity range and capacity control method thereof
JPH0540848U (en) * 1991-11-05 1993-06-01 日本電子機器株式会社 Magnetostrictive torque sensor

Also Published As

Publication number Publication date
JPS5947356B2 (en) 1984-11-19

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