CN201697649U - Wave filter circuit of steam flow rate meter - Google Patents
Wave filter circuit of steam flow rate meter Download PDFInfo
- Publication number
- CN201697649U CN201697649U CN201020177620XU CN201020177620U CN201697649U CN 201697649 U CN201697649 U CN 201697649U CN 201020177620X U CN201020177620X U CN 201020177620XU CN 201020177620 U CN201020177620 U CN 201020177620U CN 201697649 U CN201697649 U CN 201697649U
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- circuit
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- wave filter
- filter circuit
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Abstract
The utility model relates to a wave filter circuit of a steam flow rate meter. The steam flow rate meter comprises a voltage amplification circuit, a band-pass wave filter circuit and a triggering circuit which are electrically connected, wherein the band-pass wave filter circuit is a second order active band-pass wave filter circuit and comprises a low-pass circuit, a high-pass circuit and an in-phase proportion amplification circuit. The ordinary band-pass wave filter circuit is made into the second order active band-pass wave filter circuit, the wave filter effect is better, and the metering of the steam flow rate meter is more accurate.
Description
Technical field
The utility model relates to a kind of steam-flow meter, specifically, relates to a kind of steam-flow meter filtering circuit, belongs to electronic technology field.
Background technology
Stress-type steam-flow meter commonly used generally comprises piezoelectric sensing circuit, charge amplifying circuit, low-pass filter circuit, voltage amplifier circuit, bandwidth-limited circuit, trigger circuit and the power supply processing circuit of electrical connection.The stressed back of piezoelectric sensing circuit produces the square-wave pulse charge signal, a whirlpool signal is represented in a pulse, charge signal is delivered to low-pass filter circuit and is handled after charge amplifying circuit is amplified, certain decay has appearred in signal after low-pass filter circuit filtering high frequency noise signal, deliver to bandwidth-limited circuit filtering after amplifying by voltage amplifier circuit again, the signal of bandwidth-limited circuit output is delivered to trigger circuit, trigger circuit outputting standard square-wave signal, the filter effect of the bandwidth-limited circuit that this steam-flow meter adopted is poor, causes the error in dipping of steam-flow meter bigger.
The utility model content
Problem to be solved in the utility model is at above problem, and a kind of steam-flow meter filtering circuit of accurate measurement is provided.
For overcoming the above problems, the technical scheme that the utility model adopted is: a kind of steam-flow meter filtering circuit, described steam-flow meter comprises voltage amplifier circuit, bandwidth-limited circuit and the trigger circuit of electrical connection, it is characterized in that: described bandwidth-limited circuit is the active bandwidth-limited circuit of second order, comprises low pass circuit, high pass circuit and in-phase proportion amplifying circuit;
Low pass circuit comprises resistance R 10 and capacitor C 2, and an end of resistance R 10 connects the output terminal of voltage amplifier circuit, and the other end of resistance R 10 is electrically connected with high pass circuit, in-phase proportion amplifying circuit and through capacitor C 2 ground connection;
High pass circuit comprises resistance R 12 and capacitor C 3, and an end of capacitor C 3 connects the other end of resistance R 10, and the other end of capacitor C 3 is electrically connected with the in-phase proportion amplifying circuit and through resistance R 12 ground connection;
The in-phase proportion amplifying circuit, comprise operational amplifier U4, resistance R 13 and resistance R 14, the other end of the positive input termination capacitor C 3 of operational amplifier U4, negative input end connects the output terminal of operational amplifier U4 through resistance R 13 ground connection and through resistance R 14, is provided with resistance R 11 between the other end of the output terminal of operational amplifier U4 and resistance R 10.
The utility model adopts technique scheme, and have the following advantages: common bandwidth-limited circuit is set to the active active filter circuit of second order, and filter effect is better, and the metering of steam-flow meter is more accurate.
The utility model is described in further detail below in conjunction with drawings and Examples.
Description of drawings
Accompanying drawing is the circuit theory diagrams of steam-flow meter among the utility model embodiment.
Among the figure,
1-piezoelectric sensing circuit, 2-charge amplifying circuit, 3-low-pass filter circuit, 4-voltage amplifier circuit, 5-bandwidth-limited circuit, 6-trigger circuit, 7-power supply processing circuit.
Embodiment
Embodiment, as shown in the figure, a kind of steam-flow meter filtering circuit, steam-flow meter comprises piezoelectric sensing circuit 1, charge amplifying circuit 2, low-pass filter circuit 3, voltage amplifier circuit 4, bandwidth-limited circuit 5, trigger circuit 6 and the power supply processing circuit 7 of electrical connection, bandwidth-limited circuit 5 is the active bandwidth-limited circuit of second order, comprises low pass circuit, high pass circuit and in-phase proportion amplifying circuit;
Low pass circuit comprises resistance R 10 and capacitor C 2, and an end of resistance R 10 connects the output terminal of voltage amplifier circuit 4, and the other end of resistance R 10 is electrically connected with high pass circuit, in-phase proportion amplifying circuit and through capacitor C 2 ground connection;
High pass circuit comprises resistance R 12 and capacitor C 3, and an end of capacitor C 3 connects the other end of resistance R 10, and the other end of capacitor C 3 is electrically connected with the in-phase proportion amplifying circuit and through resistance R 12 ground connection;
The in-phase proportion amplifying circuit, comprise operational amplifier U4, resistance R 13 and resistance R 14, the other end of the positive input termination capacitor C 3 of operational amplifier U4, negative input end connects the output terminal of operational amplifier U4 through resistance R 13 ground connection and through resistance R 14, is provided with resistance R 11 between the other end of the output terminal of operational amplifier U4 and resistance R 10.
Claims (1)
1. steam-flow meter filtering circuit, described steam-flow meter comprises voltage amplifier circuit (4), bandwidth-limited circuit (5) and the trigger circuit (6) of electrical connection, it is characterized in that: described bandwidth-limited circuit (5) is the active bandwidth-limited circuit of second order, comprises low pass circuit, high pass circuit and in-phase proportion amplifying circuit;
Low pass circuit comprises resistance R 10 and capacitor C 2, and an end of resistance R 10 connects the output terminal of voltage amplifier circuit (4), and the other end of resistance R 10 is electrically connected with high pass circuit, in-phase proportion amplifying circuit and through capacitor C 2 ground connection;
High pass circuit comprises resistance R 12 and capacitor C 3, and an end of capacitor C 3 connects the other end of resistance R 10, and the other end of capacitor C 3 is electrically connected with the in-phase proportion amplifying circuit and through resistance R 12 ground connection;
The in-phase proportion amplifying circuit, comprise operational amplifier U4, resistance R 13 and resistance R 14, the other end of the positive input termination capacitor C 3 of operational amplifier U4, negative input end connects the output terminal of operational amplifier U4 through resistance R 13 ground connection and through resistance R 14, is provided with resistance R 11 between the other end of the output terminal of operational amplifier U4 and resistance R 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020177620XU CN201697649U (en) | 2010-05-04 | 2010-05-04 | Wave filter circuit of steam flow rate meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020177620XU CN201697649U (en) | 2010-05-04 | 2010-05-04 | Wave filter circuit of steam flow rate meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201697649U true CN201697649U (en) | 2011-01-05 |
Family
ID=43398897
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201020177620XU Expired - Fee Related CN201697649U (en) | 2010-05-04 | 2010-05-04 | Wave filter circuit of steam flow rate meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201697649U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103973259A (en) * | 2013-02-05 | 2014-08-06 | 成都摩宝网络科技有限公司 | Simple second-order band-pass filter for audio near field communication |
-
2010
- 2010-05-04 CN CN201020177620XU patent/CN201697649U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103973259A (en) * | 2013-02-05 | 2014-08-06 | 成都摩宝网络科技有限公司 | Simple second-order band-pass filter for audio near field communication |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110105 Termination date: 20130504 |