CN201697651U - Filter circuit of steam flowmeter - Google Patents
Filter circuit of steam flowmeter Download PDFInfo
- Publication number
- CN201697651U CN201697651U CN2010201776500U CN201020177650U CN201697651U CN 201697651 U CN201697651 U CN 201697651U CN 2010201776500 U CN2010201776500 U CN 2010201776500U CN 201020177650 U CN201020177650 U CN 201020177650U CN 201697651 U CN201697651 U CN 201697651U
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- capacitor
- operational amplifier
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Abstract
The utility model relates to a filter circuit of a steam flowmeter. The steam flowmeter comprises a voltage amplifier circuit, a band-pass filter circuit and a trigger circuit that are electrically connected with each other, which is characterized in that: the band-pass filter circuit is of an active band-pass filter circuit and comprises a low-pass circuit and a high-pass circuit. The common band-pass filter circuit is set to the active band-pass filter circuit so that the filtering effect is better and the metering of the steam flowmeter 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: the 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 active bandwidth-limited circuit, comprises low pass circuit and high pass circuit;
Low pass circuit, comprise resistance R 10, resistance R 11, resistance R 12, resistance R 13, resistance R 14, capacitor C 2, capacitor C 3 and operational amplifier U4, one end of resistance R 10 connects the output terminal of voltage amplifier circuit, the other end of resistance R 10 connects resistance R 11, one end of resistance R 12 and capacitor C 3, the other end ground connection of resistance R 11, the positive input terminal of the other end concatenation operation amplifier U4 of resistance R 12 and through capacitor C 2 ground connection, the output terminal of the other end concatenation operation amplifier U4 of capacitor C 3, the negative input end of operational amplifier U4 connects the output terminal of operational amplifier U4 and through resistance R 13 ground connection through resistance R 14;
High pass circuit, comprise resistance R 15, resistance R 16, resistance R 18, resistance R 17, capacitor C 4, capacitor C 5 and operational amplifier U5, the output terminal of one end concatenation operation amplifier U4 of capacitor C 4, one end of another termination capacitor C 5 of capacitor C 4 and the output terminal of operational amplifier U5, the positive input terminal of another termination operational amplifier U5 of capacitor C 5 and through resistance R 15 ground connection, the negative input end of operational amplifier U5 connects the output terminal of operational amplifier U4 through resistance R 16 and resistance R 18, the tie point of resistance R 16 and resistance R 18 is through resistance R 17 ground connection, and the output terminal of operational amplifier U4 contacts the input end of Power Generation Road.
The utility model adopts technique scheme, and have the following advantages: common bandwidth-limited circuit is set to active active filter circuit, 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, the 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 active bandwidth-limited circuit, comprises low pass circuit and high pass circuit;
Low pass circuit, comprise resistance R 10, resistance R 11, resistance R 12, resistance R 13, resistance R 14, capacitor C 2, capacitor C 3 and operational amplifier U4, one end of resistance R 10 connects the output terminal of voltage amplifier circuit (4), the other end of resistance R 10 connects resistance R 11, one end of resistance R 12 and capacitor C 3, the other end ground connection of resistance R 11, the positive input terminal of the other end concatenation operation amplifier U4 of resistance R 12 and through capacitor C 2 ground connection, the output terminal of the other end concatenation operation amplifier U4 of capacitor C 3, the negative input end of operational amplifier U4 connects the output terminal of operational amplifier U4 and through resistance R 13 ground connection through resistance R 14;
High pass circuit, comprise resistance R 15, resistance R 16, resistance R 18, resistance R 17, capacitor C 4, capacitor C 5 and operational amplifier U5, the output terminal of one end concatenation operation amplifier U4 of capacitor C 4, one end of another termination capacitor C 5 of capacitor C 4 and the output terminal of operational amplifier U5, the positive input terminal of another termination operational amplifier U5 of capacitor C 5 and through resistance R 15 ground connection, the negative input end of operational amplifier U5 connects the output terminal of operational amplifier U4 through resistance R 16 and resistance R 18, the tie point of resistance R 16 and resistance R 18 is through resistance R 17 ground connection, and the output terminal of operational amplifier U4 contacts the input end of Power Generation Road 6.
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 active bandwidth-limited circuit, comprises low pass circuit and high pass circuit;
Low pass circuit, comprise resistance R 10, resistance R 11, resistance R 12, resistance R 13, resistance R 14, capacitor C 2, capacitor C 3 and operational amplifier U4, one end of resistance R 10 connects the output terminal of voltage amplifier circuit (4), the other end of resistance R 10 connects resistance R 11, one end of resistance R 12 and capacitor C 3, the other end ground connection of resistance R 11, the positive input terminal of the other end concatenation operation amplifier U4 of resistance R 12 and through capacitor C 2 ground connection, the output terminal of the other end concatenation operation amplifier U4 of capacitor C 3, the negative input end of operational amplifier U4 connects the output terminal of operational amplifier U4 and through resistance R 13 ground connection through resistance R 14;
High pass circuit, comprise resistance R 15, resistance R 16, resistance R 18, resistance R 17, capacitor C 4, capacitor C 5 and operational amplifier U5, the output terminal of one end concatenation operation amplifier U4 of capacitor C 4, one end of another termination capacitor C 5 of capacitor C 4 and the output terminal of operational amplifier U5, the positive input terminal of another termination operational amplifier U5 of capacitor C 5 and through resistance R 15 ground connection, the negative input end of operational amplifier U5 connects the output terminal of operational amplifier U4 through resistance R 16 and resistance R 18, the tie point of resistance R 16 and resistance R 18 is through resistance R 17 ground connection, and the output terminal of operational amplifier U4 contacts the input end of Power Generation Road (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201776500U CN201697651U (en) | 2010-05-04 | 2010-05-04 | Filter circuit of steam flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201776500U CN201697651U (en) | 2010-05-04 | 2010-05-04 | Filter circuit of steam flowmeter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201697651U true CN201697651U (en) | 2011-01-05 |
Family
ID=43398899
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201776500U Expired - Fee Related CN201697651U (en) | 2010-05-04 | 2010-05-04 | Filter circuit of steam flowmeter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201697651U (en) |
-
2010
- 2010-05-04 CN CN2010201776500U patent/CN201697651U/en not_active Expired - Fee Related
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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 |