CN204836096U - Piezoelectric acceleration sensor's charge amplifier - Google Patents
Piezoelectric acceleration sensor's charge amplifier Download PDFInfo
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- CN204836096U CN204836096U CN201520486903.5U CN201520486903U CN204836096U CN 204836096 U CN204836096 U CN 204836096U CN 201520486903 U CN201520486903 U CN 201520486903U CN 204836096 U CN204836096 U CN 204836096U
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- resistance
- operational amplifier
- amplifier
- charge
- feedback
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Abstract
The utility model relates to a piezoelectric acceleration sensor's charge amplifier, enlarge the module including electric charge voltage conversion module and the operation of homophase proportion. Including an operational amplifier, feedback capacitance and feedback resistance among the electric charge conversion module, feedback capacitance and feedback resistance are between cross -over connection and an operational amplifier's the inverting input end and output. Homophase proportion operation module includes second operation amplifier, potentiometre, compensated resistance and two other resistance, and the resistance summation potential ware cross -over connection of establishing ties constitutes feedback loop in the inverting input end and the output of second operation amplifier jointly, adjusts the gain through the resistance that changes the potentiometre. The utility model discloses can turn into low impedance, high -gain voltage signal with the high impedance electric charge signal that piezoelectric acceleration sensor produced.
Description
Technical field
The utility model relates to a kind of charge amplifier, particularly a kind of charge amplifier of piezoelectric acceleration sensor.
Background technology
The charge amplifier of existing piezoelectric acceleration sensor adopts an operational amplifier, the feedback loop of this operational amplifier connects a capacitor, to form an integrating circuit, integration is carried out to input current, this input current is formed by the electric charge that the high-impedance piezoelectric element of acceleration transducer inside produces, thus form final also proportional with the acceleration output voltage with electric charge.But this voltage signal magnitude is little, and power output is low, and load capacity is poor.
Utility model content
For the defect that prior art exists, the purpose of this utility model is to provide a kind of charge amplifier of piezoelectric acceleration sensor, has the charge amplifier that charge conversion is voltage, gain amplification and impedance transformation capabilities.
For achieving the above object, the technical solution of the utility model is as follows:
A charge amplifier for piezoelectric acceleration sensor, comprises charge voltage modular converter, in-phase proportion operation amplifier module; In described charge voltage modular converter, the output of the first operational amplifier is connected with the in-phase input end of the second operational amplifier in described in-phase proportion operation amplifier module.
Described charge voltage modular converter comprises the first operational amplifier, feedback capacity and feedback resistance; Between the inverting input that described feedback resistance is connected across described first operational amplifier and output, between the inverting input that described feedback capacity is connected across described first operational amplifier and output, form an integrating circuit and integration is carried out to input current, this input current is that the electric charge that the high impedance electric device by acceleration transducer inside produces is formed, thus is formed and electric charge and the proportional output voltage of the acceleration surveyed with acceleration transducer.
Described in-phase proportion operation amplifier module comprises the second operational amplifier, the first resistance, the second resistance, potentiometer and compensating resistance; Described first resistance one end is connected with the inverting input of described second operational amplifier, other end ground connection; A stiff end of described potentiometer is connected with one end of described second resistance, the other end of described second resistance is connected with the inverting input of described second operational amplifier, another stiff end of described potentiometer and the moving contact of described potentiometer are all connected with the output of the second operational amplifier, described second resistance and described potentiometer form a feedback loop jointly, regulate gain by the resistance changing described potentiometer; Described compensating resistance one end is connected with the in-phase input end of described second operational amplifier, other end ground connection.
Compared with prior art, the beneficial effects of the utility model are:
The high impedance output charge signal of piezoelectric acceleration sensor is converted to voltage signal in low impedance, potentiometer is set in a feedback circuit, can higher and adjustable gain and load capacity be realized.
Accompanying drawing explanation
Fig. 1 is the charge amplifier circuit schematic diagram of the utility model piezoelectric acceleration sensor.
List of parts in accompanying drawing representated by each label is as follows:
Qi is input charge, and Vo is output voltage, and U1 is the first operational amplifier, and U2 is the second operational amplifier, and C1 is feedback capacity, R1 feedback resistance, and R2 is the first resistance, and R3 is the second resistance, and R4 is potentiometer, and R5 is compensating resistance.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described further.
As shown in Figure 1, a kind of charge amplifier of piezoelectric acceleration sensor, comprises charge voltage modular converter 1, in-phase proportion operation amplifier module 2; In described charge voltage modular converter 1, the output of the first operational amplifier U1 is connected with the in-phase input end of the second operational amplifier U2 in described in-phase proportion operation amplifier module 2.
Described charge voltage modular converter 1 comprises the first operational amplifier U1, feedback capacity C1 and feedback resistance R1; Between the inverting input that described feedback resistance R1 is connected across described first operational amplifier U1 and output, between the inverting input that described feedback capacity C1 is connected across described first operational amplifier U1 and output, form an integrating circuit and integration is carried out to input current, this input current is that the electric charge that the high impedance electric device by acceleration transducer inside produces is formed, thus is formed and electric charge and the proportional output voltage of the acceleration surveyed with acceleration transducer.
Described in-phase proportion operation amplifier module 2 comprises the second operational amplifier U2, the first resistance R2, the second resistance R3, potentiometer R4 and compensating resistance R5; Described first resistance R2 one end is connected with the inverting input of described second operational amplifier U2, other end ground connection; A stiff end of described potentiometer R4 is connected with one end of described second resistance R3, the other end of described second resistance R3 is connected with the inverting input of described second operational amplifier U2, another stiff end of described potentiometer R4 and the moving contact of described potentiometer R4 are all connected with the output of the second operational amplifier U2, described second resistance R3 and described potentiometer R4 forms a feedback loop jointly, regulates gain by the resistance changing described potentiometer R4; Described compensating resistance R5 one end is connected with the in-phase input end of described second operational amplifier U2, other end ground connection.
Utility model works principle and the process with above-mentioned connected mode are expressed as follows:
The high impedance charge signal Qi that piezoelectric acceleration sensor produces inputs from the inverting input of the first operational amplifier U1, after charge voltage modular converter 1, convert low-impedance voltage signal to, but gain is now still very little, again after in-phase proportion amplification module 2, namely obtain high-gain, low-impedance voltage signal Vo.
Claims (3)
1. a charge amplifier for piezoelectric acceleration sensor, is characterized in that: comprise charge voltage modular converter (1), in-phase proportion operation amplifier module (2); In described charge voltage modular converter (1), the output of the first operational amplifier (U1) is connected with the in-phase input end of the second operational amplifier (U2) in described in-phase proportion operation amplifier module (2).
2. the charge amplifier of piezoelectric acceleration sensor according to claim 1, is characterized in that: described charge voltage modular converter (1) comprises the first operational amplifier (U1), feedback capacity (C1) and feedback resistance (R1); Between the inverting input that described feedback resistance (R1) is connected across described first operational amplifier (U1) and output, between the inverting input that described feedback capacity (C1) is connected across described first operational amplifier (U1) and output, form an integrating circuit and integration is carried out to input current, this input current is that the electric charge that the high impedance electric device by acceleration transducer inside produces is formed, thus is formed and electric charge and the proportional output voltage of the acceleration surveyed with acceleration transducer.
3. the charge amplifier of piezoelectric acceleration sensor according to claim 1, it is characterized in that: described in-phase proportion operation amplifier module (2) comprises the second operational amplifier (U2), first resistance (R2), the second resistance (R3), potentiometer (R4) and compensating resistance (R5); Described first resistance (R2) one end is connected with the inverting input of described second operational amplifier (U2), other end ground connection; A stiff end of described potentiometer (R4) is connected with one end of described second resistance (R3), the other end of described second resistance (R3) is connected with the inverting input of described second operational amplifier (U2), another stiff end of described potentiometer (R4) and the moving contact of described potentiometer (R4) are all connected with the output of the second operational amplifier (U2), described second resistance (R3) and described potentiometer (R4) form a feedback loop jointly, regulate gain by the resistance changing described potentiometer (R4); Described compensating resistance (R5) one end is connected with the in-phase input end of described second operational amplifier (U2), other end ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520486903.5U CN204836096U (en) | 2015-07-08 | 2015-07-08 | Piezoelectric acceleration sensor's charge amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520486903.5U CN204836096U (en) | 2015-07-08 | 2015-07-08 | Piezoelectric acceleration sensor's charge amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204836096U true CN204836096U (en) | 2015-12-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520486903.5U Expired - Fee Related CN204836096U (en) | 2015-07-08 | 2015-07-08 | Piezoelectric acceleration sensor's charge amplifier |
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| CN (1) | CN204836096U (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106124041A (en) * | 2016-07-28 | 2016-11-16 | 北京中智永科技发展有限公司 | A kind of hydrophone of band amplifying circuit |
| CN106877604A (en) * | 2017-03-29 | 2017-06-20 | 上海浩正电气有限公司 | A kind of intelligent self-starting magneto |
| CN108008162A (en) * | 2018-01-12 | 2018-05-08 | 东华大学 | A kind of separator of the adjustable two-wire system current sensor exported in proportion |
| CN108365825A (en) * | 2018-05-16 | 2018-08-03 | 常州同惠电子股份有限公司 | Digital tunable capacitor circuit |
| CN110145300A (en) * | 2019-05-30 | 2019-08-20 | 中国石油天然气股份有限公司 | Double-channel sound transmitter suitable for oil well pressure measurement and circuit thereof |
| CN110161838A (en) * | 2019-05-06 | 2019-08-23 | 浙江大学 | The cutting force master & slave control system compensated automatically with piezoelectric force transducer static drift |
| CN111371458A (en) * | 2020-03-16 | 2020-07-03 | 长江存储科技有限责任公司 | Voltage amplifying circuit and multiplication digital-to-analog converter |
| WO2022042677A1 (en) * | 2020-08-27 | 2022-03-03 | 上海大学 | Signal conditioning system for improving low-frequency measurement performance of acceleration sensor |
| CN115347876A (en) * | 2022-10-17 | 2022-11-15 | 电子科技大学 | Analog front-end circuit for receiving ultrasonic echo signals |
-
2015
- 2015-07-08 CN CN201520486903.5U patent/CN204836096U/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106124041A (en) * | 2016-07-28 | 2016-11-16 | 北京中智永科技发展有限公司 | A kind of hydrophone of band amplifying circuit |
| CN106877604A (en) * | 2017-03-29 | 2017-06-20 | 上海浩正电气有限公司 | A kind of intelligent self-starting magneto |
| CN108008162A (en) * | 2018-01-12 | 2018-05-08 | 东华大学 | A kind of separator of the adjustable two-wire system current sensor exported in proportion |
| CN108365825A (en) * | 2018-05-16 | 2018-08-03 | 常州同惠电子股份有限公司 | Digital tunable capacitor circuit |
| CN110161838A (en) * | 2019-05-06 | 2019-08-23 | 浙江大学 | The cutting force master & slave control system compensated automatically with piezoelectric force transducer static drift |
| CN110145300A (en) * | 2019-05-30 | 2019-08-20 | 中国石油天然气股份有限公司 | Double-channel sound transmitter suitable for oil well pressure measurement and circuit thereof |
| CN110145300B (en) * | 2019-05-30 | 2022-03-01 | 中国石油天然气股份有限公司 | Double-channel sound transmitter suitable for oil well pressure measurement and circuit thereof |
| CN111371458A (en) * | 2020-03-16 | 2020-07-03 | 长江存储科技有限责任公司 | Voltage amplifying circuit and multiplication digital-to-analog converter |
| WO2022042677A1 (en) * | 2020-08-27 | 2022-03-03 | 上海大学 | Signal conditioning system for improving low-frequency measurement performance of acceleration sensor |
| US11726108B2 (en) | 2020-08-27 | 2023-08-15 | Shanghai University | Signal conditioning system for improving low-frequency measurement performance of acceleration sensor |
| CN115347876A (en) * | 2022-10-17 | 2022-11-15 | 电子科技大学 | Analog front-end circuit for receiving ultrasonic echo signals |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151202 Termination date: 20160708 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |