CN201697650U - Low-pass filter circuit of steam flow meter - Google Patents
Low-pass filter circuit of steam flow meter Download PDFInfo
- Publication number
- CN201697650U CN201697650U CN2010201776271U CN201020177627U CN201697650U CN 201697650 U CN201697650 U CN 201697650U CN 2010201776271 U CN2010201776271 U CN 2010201776271U CN 201020177627 U CN201020177627 U CN 201020177627U CN 201697650 U CN201697650 U CN 201697650U
- Authority
- CN
- China
- Prior art keywords
- resistance
- operational amplifier
- circuit
- low
- capacitor
- 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.)
- Expired - Fee Related
Links
Images
Landscapes
- Measuring Volume Flow (AREA)
Abstract
The utility model relates to a low-pass filter circuit of a steam flow meter. The steam flow meter comprises a charge amplification circuit, a low-pass filter circuit and a voltage amplification circuit which are electrically connected, wherein the low-pass filter circuit comprises a resistor R3, a resistor R4, a resistor R5, a resistor R6, a capacitor C1, a capacitor C2 and an operational amplifier U2, one end of the resistor R3 is connected with the output end of the charge amplification circuit, the other end of the resistor R3 is connected with one end of the resistor R4 and one end of the capacitor C2, the other end of the resistor R4 is connected with the positive input end of the operational amplifier U2 and is grounded by the capacitor C1, the other end of the capacitor C2 is connected with the output end of the operational amplifier U2, the negative input end of the operational amplifier U2 is grounded by the resistor R5 and is connected with the output end of the operational amplifier U2 by the resistor R6, and the output end of the operational amplifier U2 is connected with the voltage amplification circuit. The filtration effect of intermediate-frequency and high-frequency signals can be enhanced, a low-frequency signal is also reinforced, and the metering of the steam flow 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 low-pass filter 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 low-pass filter that this steam-flow meter adopted is relatively poor to the filter effect of high-frequency signal, causes the error in dipping of steam-flow meter big.
The utility model content
Problem to be solved in the utility model is at above problem, and a kind of steam-flow meter low-pass filter 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 low-pass filter circuit, described steam-flow meter comprises the charge amplifying circuit of electrical connection, low-pass filter circuit and voltage amplifier circuit, it is characterized in that: described low-pass filter circuit comprises resistance R 3, resistance R 4, resistance R 5, resistance R 6, capacitor C 1, capacitor C 2 and operational amplifier U2, one end of resistance R 3 connects the output terminal of charge amplifying circuit, the other end of resistance R 3 connects an end of resistance R 4 and an end of capacitor C 2, the positive input terminal of another termination operational amplifier U2 of resistance R 4 and through capacitor C 1 ground connection, the output terminal of another termination operational amplifier U2 of capacitor C 2, the negative input end of operational amplifier U2 connects the output terminal of operational amplifier U2, the output termination voltage amplifier circuit of operational amplifier U2 through resistance R 5 ground connection and through resistance R 6.
The utility model adopts technique scheme, and have the following advantages: can improve the filter effect of centering, high-frequency signal, simultaneously low frequency signal be strengthened, 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 low-pass filter circuit, steam-flow meter comprises the piezoelectric sensing circuit 1 of electrical connection, charge amplifying circuit 2, low-pass filter circuit 3, voltage amplifier circuit 4, bandwidth-limited circuit 5, trigger circuit 6 and power supply processing circuit 7, low-pass filter circuit 3 comprises resistance R 3, resistance R 4, resistance R 5, resistance R 6, capacitor C 1, capacitor C 2 and operational amplifier U2, one end of resistance R 3 connects the output terminal of charge amplifying circuit 2, the other end of resistance R 3 connects an end of resistance R 4 and an end of capacitor C 2, the positive input terminal of another termination operational amplifier U2 of resistance R 4 and through capacitor C 1 ground connection, the output terminal of another termination operational amplifier U2 of capacitor C 2, the negative input end of operational amplifier U2 connects the output terminal of operational amplifier U2, the output termination voltage amplifier circuit 4 of operational amplifier U2 through resistance R 5 ground connection and through resistance R 6.
Claims (1)
1. steam-flow meter low-pass filter circuit, described steam-flow meter comprises the charge amplifying circuit (2) of electrical connection, low-pass filter circuit (3) and voltage amplifier circuit (4), it is characterized in that: described low-pass filter circuit (3) comprises resistance R 3, resistance R 4, resistance R 5, resistance R 6, capacitor C 1, capacitor C 2 and operational amplifier U2, one end of resistance R 3 connects the output terminal of charge amplifying circuit (2), the other end of resistance R 3 connects an end of resistance R 4 and an end of capacitor C 2, the positive input terminal of another termination operational amplifier U2 of resistance R 4 and through capacitor C 1 ground connection, the output terminal of another termination operational amplifier U2 of capacitor C 2, the negative input end of operational amplifier U2 connects the output terminal of operational amplifier U2, the output termination voltage amplifier circuit (4) of operational amplifier U2 through resistance R 5 ground connection and through resistance R 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201776271U CN201697650U (en) | 2010-05-04 | 2010-05-04 | Low-pass filter circuit of steam flow meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201776271U CN201697650U (en) | 2010-05-04 | 2010-05-04 | Low-pass filter circuit of steam flow meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201697650U true CN201697650U (en) | 2011-01-05 |
Family
ID=43398898
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201776271U Expired - Fee Related CN201697650U (en) | 2010-05-04 | 2010-05-04 | Low-pass filter circuit of steam flow meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201697650U (en) |
-
2010
- 2010-05-04 CN CN2010201776271U patent/CN201697650U/en not_active Expired - Fee Related
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103760403A (en) | Bus voltage detection circuit of high-frequency precipitator power supply | |
| CN203672952U (en) | Bus voltage detection circuit of high-frequency dedusting power supply | |
| CN201697650U (en) | Low-pass filter circuit of steam flow meter | |
| CN201903573U (en) | Current detection and amplification circuit used for two-wire manufactured instrument | |
| CN201697649U (en) | Wave filter circuit of steam flow rate meter | |
| CN201697652U (en) | Low-pass filter circuit for steam flowmeter | |
| CN203241084U (en) | Vortex street flow converter based on application-specific integrated circuit | |
| CN104270108A (en) | Charge amplifier | |
| CN201878104U (en) | Filter | |
| CN201699657U (en) | Voltage amplifier circuit of steam flowmeter | |
| CN201697651U (en) | Filter circuit of steam flowmeter | |
| CN201699658U (en) | Voltage amplifying circuit of steam flowmeter | |
| CN202309643U (en) | Direct current-coupled low-pass resistance-capacitance (RC) active filter | |
| CN203632625U (en) | Signal acquisition-amplification circuit | |
| CN102355228B (en) | Multi-channel lowpass filter | |
| CN204556030U (en) | Multiple sensor signals acquisition processing device | |
| CN208508905U (en) | AD wave filtering circuit | |
| CN202748402U (en) | Anti-interference voltage transducer | |
| CN202043076U (en) | Preposition amplifying circuit for turbine meter | |
| CN204810249U (en) | Delay circuit based on bluetooth audio frequency detects | |
| CN202720271U (en) | Detection circuit of low-pass RC active filer | |
| CN103684298A (en) | High-gain differential signal amplification circuit | |
| CN201540296U (en) | Voltage type engine speed-measuring sensor | |
| CN206225002U (en) | Sound transducer circuit | |
| CN203135801U (en) | Pre-positioned signal amplifying circuit of magneto-electricity vortex street sensor |
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 |