JPS57207817A - Capacitive converter - Google Patents
Capacitive converterInfo
- Publication number
- JPS57207817A JPS57207817A JP9254381A JP9254381A JPS57207817A JP S57207817 A JPS57207817 A JP S57207817A JP 9254381 A JP9254381 A JP 9254381A JP 9254381 A JP9254381 A JP 9254381A JP S57207817 A JPS57207817 A JP S57207817A
- Authority
- JP
- Japan
- Prior art keywords
- output
- capacity
- negative
- inverted input
- circuit
- 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
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 measure physical quantity with high accuracy by simple circuit constitution, by selecting one of 2 sensor elements by an output of a hysteresis circuit, and executing a negative feed-back to an operational amplifier by the selected capacity. CONSTITUTION:This converter is provided with a capacitive sensor 1 consisting of 2 capacity elements 1a, 1b whose both or one capacity is varied in accordance with a variation of physical quantity, and 1s, and an output A of an operational amplifier 2 is negative-fed back to the non-inverted input side through the capacity of the element 1a and 1s, and the output A is negative-fed back to the inverted input side through the element 1b and 1s. Selective switching of this negative feedback is executed in accordance with an output signal of a hysteresis circuit 3 for inputting the output A. In this state, voltage in case when output voltage of the circuit 3 has risen is applied to an inverted input of the amplifier 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9254381A JPS57207817A (en) | 1981-06-16 | 1981-06-16 | Capacitive converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9254381A JPS57207817A (en) | 1981-06-16 | 1981-06-16 | Capacitive converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS57207817A true JPS57207817A (en) | 1982-12-20 |
Family
ID=14057290
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9254381A Pending JPS57207817A (en) | 1981-06-16 | 1981-06-16 | Capacitive converter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57207817A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009136198A2 (en) * | 2008-05-07 | 2009-11-12 | Wolfson Microelectronics Plc | Capacitive transducer circuit and method |
| CN109798923A (en) * | 2017-11-17 | 2019-05-24 | 艾普凌科有限公司 | Sensor device |
-
1981
- 1981-06-16 JP JP9254381A patent/JPS57207817A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009136198A2 (en) * | 2008-05-07 | 2009-11-12 | Wolfson Microelectronics Plc | Capacitive transducer circuit and method |
| WO2009136198A3 (en) * | 2008-05-07 | 2010-07-15 | Wolfson Microelectronics Plc | Capacitive transducer circuit and method |
| US8913762B2 (en) | 2008-05-07 | 2014-12-16 | Wolfson Microelectronics Ltd. | Capacitive transducer circuit and method |
| CN109798923A (en) * | 2017-11-17 | 2019-05-24 | 艾普凌科有限公司 | Sensor device |
| CN109798923B (en) * | 2017-11-17 | 2022-02-18 | 艾普凌科有限公司 | Sensor device |
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