CN206364777U - A kind of signal filter circuit - Google Patents
A kind of signal filter circuit Download PDFInfo
- Publication number
- CN206364777U CN206364777U CN201621487771.9U CN201621487771U CN206364777U CN 206364777 U CN206364777 U CN 206364777U CN 201621487771 U CN201621487771 U CN 201621487771U CN 206364777 U CN206364777 U CN 206364777U
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- China
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- signal
- operational amplifier
- input
- resistance
- output
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Abstract
The utility model discloses a kind of signal filter circuit, circuit structure is：Resistance R1 one end is connected as signal input part input with the signal output part of signal generation apparatus, resistance R1 other end shunt-wound capacitance C1 one end, switch S1 one end and operational amplifier A R2 negative input end, switch the S1 other end, the electric capacity C1 other end and operational amplifier A R2 output end are simultaneously connect as signal output part output, resistance R2 one end ground connection, the other end is connected with operational amplifier A R2 positive input terminal, operational amplifier A R2 positive power source terminal is connected with power supply V1 negative poles, operational amplifier A R2 negative power end is connected with power supply V2 positive pole.The utility model realizes the difference filtering of high-frequency signal and low frequency signal by switching S1 closed and disconnected.
Description
Technical field
The utility model is related to filter circuit, more particularly to a kind of signal filter circuit.
Background technology
Magnetoelectric induction velocity sensor output power, performance is stable, is generally used in practice in engineering, still
It is easily disturbed in low speed sensing process, what magnetoelectric induction velocity sensor was easily disturbed in low speed sensing process
Shortcoming cannot be solved well always.
At present, many solutions are handled using digital filtering algorithm, such as digital Kalman filter etc., this
A little algorithm filters are complicated, expensive, debugging trouble, and in engineering, practical value is little in practice, and can not realize difference filter
The function of ripple.
Utility model content
The utility model purpose is to provide a kind of signal filter circuit realized and be simply adapted to engineering, existing to solve
Technology can not distinguish filtering, the problem of low frequency signal is easily disturbed.
To achieve the above object, the utility model provides a kind of signal filter circuit, and circuit structure is：The one of resistance R1
Hold and be connected for signal input part input with the signal output part of signal generation apparatus, resistance R1 other end shunt-wound capacitance C1's
The negative input end of one end, the one end for switching S1 and operational amplifier A R2, switchs the S1 other end, the electric capacity C1 other end and fortune
Amplifier AR2 output end is calculated as signal output part output, resistance R2 one end is grounded, the other end and operational amplifier
AR2 positive input terminal is connected, and operational amplifier A R2 positive power source terminal is connected with power supply V1 negative poles, operational amplifier A R2 negative electricity
Source is connected with power supply V2 positive pole.
Further, signal generation apparatus is magnetoelectric induction sensor.
Further, signal output part output is connected with the input of signaling control unit, signaling control unit it is defeated
Go out end and be connected with the input that low speed filtering enables control unit, low speed filtering enables the output end control signal filter of control unit
The low frequency filtering of wave circuit is enabled.
The utility model has the advantages that：
A kind of signal filter circuit of the present utility model, by the closure of switch with disconnecting to low frequency signal and high-frequency signal
Difference filtering, greatly improves the processing accuracy of low frequency signal, and can effectively filter out the noise in low low frequency signal, improves
The antijamming capability of signal.
In addition to objects, features and advantages described above, the utility model also has other purposes, feature and excellent
Point.Below with reference to accompanying drawings, the utility model is described in further detail.
Brief description of the drawings
The accompanying drawing for constituting the part of the application is used for providing further understanding to of the present utility model, of the present utility model
Schematic description and description is used to explain the utility model, does not constitute to improper restriction of the present utility model.In accompanying drawing
In：
Fig. 1 is the signal filter circuit schematic diagram of the utility model preferred embodiment；
Fig. 2 is the structure principle chart of the utility model preferred embodiment.
Embodiment
Embodiment of the present utility model is described in detail below in conjunction with accompanying drawing, but the utility model can be by right
It is required that the multitude of different ways for limiting and covering is implemented.
Embodiment 1：
Referring to Fig. 1, a kind of signal filter circuit of the present utility model, including：Resistance R1 one end is signal input part
Input is connected with the signal output part of signal generation apparatus, resistance R1 other end shunt-wound capacitance C1 one end, the one of switch S1
End and operational amplifier A R2 negative input end, switch the defeated of the S1 other end, the electric capacity C1 other end and operational amplifier A R2
Go out end as signal output part output, resistance R2 one end is grounded, the positive input terminal phase of the other end and operational amplifier A R2
Even, operational amplifier A R2 positive power source terminal is connected with power supply V1 negative poles, and operational amplifier A R2 negative power end is with power supply V2's
Positive pole is connected.
Signal is from signal input part input flows into circuit, and when the switches are opened, circuit plays the function of LPF；
When the switch is closed, circuit plays the function of high-pass filtering.The utility model is by switch closed and disconnected, to high-frequency signal
Difference filtering is carried out with low frequency signal, the processing accuracy of low frequency signal is greatly improved, and can effectively filter out in low frequency signal
Noise, improve the antijamming capability of signal.
Further, the signal generation apparatus in this implementation row is magnetoelectric induction sensor.Magnetoelectric induction sensor
By the data conversion collected into electric signal, electric signal flows into signal filter circuit and carries out subsequent treatment.Magnetoelectric induction is sensed
Device output power, performance is stable, and sensitivity is high, the accurate data of collection.
Further, signal output part output is connected with the input of signaling control unit, signaling control unit it is defeated
Go out end and be connected with the input that low speed filtering enables control unit, low speed filtering enables the output end control signal filter of control unit
The low frequency filtering of wave circuit is enabled.The signal of signal output part output outputs flows into signaling control unit, signaling control unit
The signal of inflow is analyzed, and control unit is enabled to low speed filtering and sends control signal, it is single that low speed filtering enables control
Member determines whether the low speed filter function of signal filter circuit is opened according to the control signal received, that is, signal filter circuit
In switch whether disconnect.Signaling control unit can use single-chip microcomputer, control low speed to filter by way of exporting low and high level
Ripple enables whether control unit works, and can also be compared input signal with threshold value to come by programmable logic device given threshold
Which kind of control signal decision sends.
Embodiment 2：
Referring to Fig. 2, a kind of signal filter circuit of the present utility model applies to automobile starter Auto-Test System, its
Signal input part connection speed signal gathering unit, such as magnetoelectric induction velocity sensor, magnetoelectric induction velocity sensor will
The rate signal collected is converted to voltage signal, and this signal flows into PLC signaling control units after signal filter circuit, such as
The voltage signal received is reduced into rate signal by Siemens S7-300, PLC signaling control unit, then it is analyzed simultaneously
Other systems control signal is sent, low speed filtering enables control unit and determines signal filtering according to the system control signal received
Whether circuit low speed filter function is opened.
The present embodiment can be filtered to the slow-speed of revolution and the difference of high tach signal, so that the processing accuracy of slow-speed of revolution signal is big
It is big to improve, and the noise in slow-speed of revolution signal can be effectively filtered out, improve the antijamming capability of rate signal.
In summary, the utility model enables the closed and disconnected of switch by being filtered in signal filter circuit, realizes high
The difference filtering of frequency signal and low frequency signal, substantially increases the processing accuracy of low frequency signal, effectively filters out in low frequency signal
Noise, improves the antijamming capability of signal.
Preferred embodiment of the present utility model is these are only, the utility model is not limited to, for this area
Technical staff for, the utility model can have various modifications and variations.It is all it is of the present utility model spirit and principle within,
Any modification, equivalent substitution and improvements made etc., should be included within protection domain of the present utility model.
Claims (4)
1. a kind of signal filter circuit, it is characterised in that circuit structure is：Resistance R1 one end is used as signal input part input
It is connected with the signal output part of signal generation apparatus, the other end shunt-wound capacitance C1 of resistance R1 one end, switch S1
One end and operational amplifier A R2 negative input end, the other end of the switch S1, the other end of the electric capacity C1 and the computing
Amplifier AR2 output end is simultaneously connect as signal output part output, and resistance R2 one end is grounded, the other end of the resistance R2
It is connected with the positive input terminal of the operational amplifier A R2, positive power source terminal and the power supply V1 negative poles of the operational amplifier A R2 connect
Connect, the negative power end of the operational amplifier A R2 is connected with power supply V2 positive pole.
2. a kind of signal filter circuit according to claim 1, it is characterised in that the signal generation apparatus is magnetoelectricity sense
Inductive transducer.
3. a kind of signal filter circuit according to claim 1 or 2, it is characterised in that the signal output part output
It is connected with the input of signaling control unit.
4. a kind of signal filter circuit according to claim 3, it is characterised in that the output end of the signaling control unit
The input that low speed filtering enables control unit is connected with, the low speed filtering enables the output end control signal filter of control unit
The low frequency filtering of wave circuit is enabled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621487771.9U CN206364777U (en) | 2016-12-30 | 2016-12-30 | A kind of signal filter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621487771.9U CN206364777U (en) | 2016-12-30 | 2016-12-30 | A kind of signal filter circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206364777U true CN206364777U (en) | 2017-07-28 |
Family
ID=59379136
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621487771.9U Expired - Fee Related CN206364777U (en) | 2016-12-30 | 2016-12-30 | A kind of signal filter circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206364777U (en) |
-
2016
- 2016-12-30 CN CN201621487771.9U patent/CN206364777U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| 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: 20170728 Termination date: 20171230 |