CN203251273U - Charge amplifier - Google Patents
Charge amplifier Download PDFInfo
- Publication number
- CN203251273U CN203251273U CN 201320248939 CN201320248939U CN203251273U CN 203251273 U CN203251273 U CN 203251273U CN 201320248939 CN201320248939 CN 201320248939 CN 201320248939 U CN201320248939 U CN 201320248939U CN 203251273 U CN203251273 U CN 203251273U
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- CN
- China
- Prior art keywords
- controlled switch
- triode
- signal input
- charge amplifier
- capacitor
- Prior art date
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Abstract
The utility model provides a charge amplifier. The charge amplifier is provided with an inverting amplifier, an equivalent capacitor, a feedback capacitor and a leakage resistor, wherein the leakage resistor is connected with the feedback capacitor in parallel and connected between the inverted input end and the inverted output end of the inverting amplifier. The charge amplifier comprises a sensing signal input end, a direct current power input end, a triode, a controlled switch and a cut-off capacitor. A source electrode of the triode is connected with the sensing signal input end, a drain electrode of the triode is connected to one grounding end, the controlled switch is in series connection with the cut-off capacitor, one end of a series branch capacitor is connected to the sensing signal input end, one end of the controlled switch is connected to the grounding end, and a non-grounding end of the controlled switch is connected with a grid electrode of the triode and the direct current power input end.
Description
Technical field
The utility model relates to a kind of amplifying circuit, relates in particular to a kind of charge amplifier with sensing detection field.
Background technology
Utilizing piezoelectric transducer detecting vibration acceleration is the research topic in mechanical shock field, wherein, commonly adopt piezoelectric transducer to test oscillatory acceleration as primary instrument, charge amplifier is processed recording sensor signal, as the secondary meter of measuring system.
Detecting for the mechanical oscillation acceleration of the part plant equipment of mechanical field is to be in the continuous firing, but need to be for detecting under the particular job state or in the operating time for some machinery speech.In addition, also have the detecting of part machinery to be undertaken by external equipment.
The utility model content
The purpose of this utility model is to provide a kind of charge amplifier to begin according to the work of the sensing detection equipment of open and close control take this charge amplifying circuit as component units of controlled switch and to end, the residual charge in this charge amplifier be can effectively remove simultaneously, test susceptibility and precision improved.
The utility model provides a kind of charge amplifier for achieving the above object, and it has an inverting amplifier, equivalent capacity, feedback capacity and in parallel with described feedback capacity and be connected to ohmic leakage between described inverting amplifier inverting input and the output.
Special this charge amplifier also comprises: a transducing signal input, one direct current power input, triode and a controlled switch, one cuts off electric capacity, described triode source electrode is connected with described transducing signal input, its drain electrode is connected to an earth terminal, described controlled switch and described partition capacitances in series, partition electric capacity one end of this series arm is connected to described transducing signal input, controlled switch one end is connected to earth terminal, and the ungrounded end of described controlled switch is connected with described triode grid and dc supply input.
Description of drawings
Below in conjunction with accompanying drawing, by embodiment of the present utility model is described in detail, will make the technical solution of the utility model and other beneficial effect apparent.
In the accompanying drawing,
Fig. 1 is the circuit connection diagram of the utility model charge amplifier.
Embodiment
Technological means and the effect thereof taked for further setting forth the utility model are described in detail below in conjunction with preferred embodiment of the present utility model and accompanying drawing thereof.
See also Fig. 1, the utility model provides a kind of charge amplifier, and it has an inverting amplifier OP, equivalent capacity C
2, feedback capacity C
3And and described feedback capacity C
3In parallel and be connected to ohmic leakage R between described inverting amplifier OP inverting input and the output.
Described equivalent capacity C
2Reality does not exist in this charge amplifying circuit, and it is the overlap capacitance of front end sensors electric capacity, cable capacitance and rear end inverting amplifier OP input capacitance.
Described feedback capacity C
3And ohmic leakage R and the typical amplifying unit circuit of the common formation of inverting amplifier OP, its operation principle is known, repeats no more.
Especially, this charge amplifier also comprises: a transducing signal input V
i, a direct current power input V
c, triode T and a controlled switch K, one cuts off capacitor C
1, described triode T source electrode s and described transducing signal input V
iConnect, its drain electrode g is connected to an earth terminal GND, described controlled switch K and described partition capacitor C
1Series connection, this series arm capacitor C
1One end 101 is connected to described transducing signal input V
i, controlled switch K one end 102 is connected to earth terminal GND, the ungrounded end 103 of described controlled switch K and described triode grid d and dc supply input V
cConnect.
The course of work and principle with the utility model charge amplifier of above-mentioned connected mode are expressed as follows:
A, when described controlled switch K opens, described this triode T grid d that is added in and the voltage of drain electrode between the g be described dc supply input V
cOn direct voltage, this direct voltage size is so that described triode T conducting, at this moment, transducing signal input V
iMeasured signal is connected to earth terminal GND by described this triode T, and like this, the charge amplifier of this utility model just is in the work cut-off state.
In addition, when described controlled switch K opens, described partition capacitor C
1And described equivalent capacity C
2Source electrode s and drain electrode g by described triode T is connected to earth terminal GND equally, finishes discharge process, eliminates this utility model charge amplifier residual charge.
B, when described controlled switch K is closed, the described triode T grid d that is added in of institute is dragged down by described earth terminal GND with voltage between the drain electrode g, this triode T ends at this moment, the described transducing signal input V that is added in
iSensor measurement signal be directly inputted into the inverting input of described inverting amplifier OP, finish the amplification of measuring-signal.
The above; for the person of ordinary skill of the art; can make other various corresponding changes and distortion according to the technical solution of the utility model and technical conceive, and all these changes and distortion all should belong to the protection range of the utility model claim.
Claims (1)
1. charge amplifier, has an inverting amplifier, equivalent capacity, feedback capacity and in parallel with described feedback capacity and be connected to ohmic leakage between described inverting amplifier inverting input and the output, it is characterized in that, comprise: a transducing signal input, one direct current power input, triode and a controlled switch, one cuts off electric capacity, described triode source electrode is connected with described transducing signal input, its drain electrode is connected to an earth terminal, described controlled switch and described partition capacitances in series, partition electric capacity one end of this series arm is connected to described transducing signal input, controlled switch one end is connected to earth terminal, and the ungrounded end of described controlled switch is connected with described triode grid and dc supply input.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320248939 CN203251273U (en) | 2013-05-08 | 2013-05-08 | Charge amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320248939 CN203251273U (en) | 2013-05-08 | 2013-05-08 | Charge amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203251273U true CN203251273U (en) | 2013-10-23 |
Family
ID=49377686
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320248939 Expired - Fee Related CN203251273U (en) | 2013-05-08 | 2013-05-08 | Charge amplifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203251273U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103954794A (en) * | 2014-05-13 | 2014-07-30 | 安徽理工大学 | Charge amplification and acquisition system of low-frequency piezoelectricity acceleration sensor |
| CN105588951A (en) * | 2014-10-23 | 2016-05-18 | 北京自动化控制设备研究所 | Molecular electronic angular accelerometer weak signal processing circuit |
| CN108809266A (en) * | 2018-07-11 | 2018-11-13 | 中北大学 | A kind of charge amplifier circuit |
-
2013
- 2013-05-08 CN CN 201320248939 patent/CN203251273U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103954794A (en) * | 2014-05-13 | 2014-07-30 | 安徽理工大学 | Charge amplification and acquisition system of low-frequency piezoelectricity acceleration sensor |
| CN105588951A (en) * | 2014-10-23 | 2016-05-18 | 北京自动化控制设备研究所 | Molecular electronic angular accelerometer weak signal processing circuit |
| CN108809266A (en) * | 2018-07-11 | 2018-11-13 | 中北大学 | A kind of charge amplifier circuit |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131023 Termination date: 20160508 |