CN206135879U - A signal conditioning device for sensor - Google Patents
A signal conditioning device for sensor Download PDFInfo
- Publication number
- CN206135879U CN206135879U CN201621238660.4U CN201621238660U CN206135879U CN 206135879 U CN206135879 U CN 206135879U CN 201621238660 U CN201621238660 U CN 201621238660U CN 206135879 U CN206135879 U CN 206135879U
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- circuit
- resistance
- operational amplifier
- signal
- amplifier
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Abstract
The utility model discloses a signal conditioning device for sensor belongs to signal conditioning device technical field, and the device is including amplifier circuit, detection circuit and filter circuit, comes the signal input of self -rotation sensilla to amplifier circuit's an operational amplifier U3's input, and amplifier circuit connects detection circuit, and detection circuit connects filter circuit. Output signal after filter outlet nurses one's health, among the amplifier circuit, the outside gain that U3 was put to first resistance R1 and first fortune sets up the end and links to each other, a second resistance R2 and a third resistance R3 access operational amplifier U3's input. The utility model discloses an amplifier circuit, detection circuit and filter circuit, the sampling circuit's of self -rotation sensilla or some parameter incoming signal in the future, through enlargeing, integer output is fit for follow -up observing and controlling unit interface's signal.
Description
Technical field
The utility model belongs to signal regulating device technical field, and in particular to a kind of signal condition for sensor is filled
Put.
Background technology
Now, gain and anti-Radio frequency interference ability of the amplifying circuit of most of signal using fixation；Two traditional poles
Pipe precision full-wave rectifying circuit, build-out resistor is few, is made up of amplifier LM358 and diode, and the one-way conduction of diode is here
Serve the effect of current-controlled switch, although simple structure is easily achieved, but the shadow of diode nonlinear characteristic, threshold voltage
The discharge and recharge difference on the frequency with circuit is rung, wave distortion will be caused；At present most of filter circuits are using single amplifier structure, although into
This relatively low design is simple, but it cannot realize the adjustment effect of antipodal points angular frequency and quality factor, it is impossible to realize high-precision
Low pass filter.
The content of the invention
According to above the deficiencies in the prior art, technical problem to be solved in the utility model is to propose one kind for sensing
The signal regulating device of device, by amplifying circuit, detecting circuit and filter circuit, by adopting from sensor or some parameters
The input signal of sample circuit, through amplifying, integer output is adapted to the signal of follow-up measurement and control unit interface.The utility model is using increasing
The adjustable pre-amplification circuit of benefit, the detecting circuit of two stage amplifer structure and filter circuit, the signal regulating device can be to certain
The signal of individual sensor output carries out gamma correction, and signal fidelity after treatment is higher, therefore can improve this survey
Accuracy of measurement.
In order to solve above-mentioned technical problem, the technical solution adopted in the utility model is：A kind of signal for sensor
Conditioning device, the signal regulating device includes amplifying circuit, detecting circuit and filter circuit, from the signal input of sensor
To amplifying circuit, amplifying circuit connection detecting circuit, detecting circuit connection filter circuit, the output after filter circuit output conditioning
Signal, in amplifying circuit, the outside gain of first resistor R1 and the first amplifier U3 arranges end and is connected, second resistance R2 and the 3rd electric
Resistance R3 accesses the input of the first operational amplifier U3.
In said apparatus, the detecting circuit includes the second operational amplifier U2A, the 3rd operational amplifier U2B, the first pole
Pipe D1, the second pole pipe D2, the first electric capacity C1 and multiple resistance, the output end of amplifying circuit connects the first electric capacity C1, the first electric capacity
C1 is connected to the negative input end of the second operational amplifier U2A by resistance, and the positive pole of the first pole pipe D1 is connected to the second computing and puts
The output end of big device U2A, negative pole connects the negative input end of the second operational amplifier U2A, and the negative pole of the second pole pipe D2 connects the second fortune
The output end of amplifier U2A is calculated, the positive pole of the second pole pipe D2 connects the negative input end of the 3rd operational amplifier U2B by resistance.
The filter circuit includes second-order low-pass filter circuit, the 5th operational amplifier U2D and multiple resistance, the output of detecting circuit
End connection second-order low-pass filter circuit, the output end of second-order low-pass filter circuit connects the 5th operational amplifier by resistance
The positive input terminal of U2D, between the negative input end and output end of the 5th operational amplifier U2D a resistance is connected with.The second order
Low-pass filter circuit includes four-operational amplifier U2C, multiple resistance and electric capacity, and the output end of detecting circuit is connected by resistance
The positive input terminal of four-operational amplifier U2C is connect, the output end of four-operational amplifier U2C connects the 5th computing and puts by resistance
The positive input terminal of big device U2D.
The utility model beneficial effect is:Amplifying circuit is provided with the utility model, input passes through second resistance the 3rd
Resistance accesses the first opamp input terminal, and null offset, first resistor can be suppressed to be used to adjust amplifier gain, while
AD620 amplifiers are applied to high electrical resistance value, compared with the sensor circuit designs of low supply voltage, the triode of its input
The differential bipolar input that (being located inside chip AD620) provides, it is ensured that the high accuracy of gain control.Signal demodulator circuit is adopted
The active rectifying circuit of operational amplifier and general-purpose diode composition, can effectively solve the problem that the nonlinear characteristic and threshold value of diode
The impact of voltage, on the basis of linear detector, plus one-level adder, allow input signal another polar voltages without inspection
Ripple, and adder is directly sent to, it is added with the output voltage from wave detector, constitute accurate absolute value circuit.
Description of the drawings
The mark in the content and figure expressed by this specification accompanying drawing is briefly described below：
Fig. 1 is the schematic block circuit diagram of the signal regulating device of specific embodiment of the present utility model.
Fig. 2 is the circuit theory diagrams of the amplifying circuit of specific embodiment of the present utility model.
Fig. 3 is the circuit theory diagrams of the detecting circuit of specific embodiment of the present utility model.
Fig. 4 is the circuit theory diagrams of the filter circuit of specific embodiment of the present utility model.
Specific embodiment
Below against accompanying drawing, by the description to embodiment, specific embodiment of the present utility model is for example involved each
The shape of component, the mutual alignment between construction, each several part and annexation, the effect of each several part and operation principle, manufacture work
Skill and operate with method etc., are described in further detail, to help those skilled in the art to invention of the present utility model
Design, technical scheme have more complete, accurate and deep understanding.
As shown in figure 1, the utility model provides a kind of signal regulating device for sensor, signal regulating device includes
Amplifying circuit, detecting circuit and filter circuit, amplifying circuit connection detecting circuit, detecting circuit connection filter circuit will be from
The input signal of the sample circuit of sensor or some parameters, through amplifying, integer output is adapted to follow-up measurement and control unit interface
Signal.
Amplifying circuit is as shown in Fig. 2 including first resistor R1, second resistance R2,3rd resistor R3 and the first operation amplifier
Device U3 (referred to as the first amplifier U3), sensor output signal accesses the first amplifier U3 input, first resistor R1 and the first amplifier
The outside gain of U3 arranges end and is connected, for arranging the gain of the first operational amplifier, second resistance R2 and 3rd resistor R3
One end connects respectively the positive input terminal and negative input end of the first amplifier U3, other end ground connection, for suppressing null offset.Simultaneously
AD620 amplifiers are applied to high electrical resistance value, compared with the sensor circuit designs of low supply voltage, the triode of its input
The differential bipolar input that (being located inside chip AD620) provides, it is ensured that the high accuracy of gain control.Detecting circuit includes second
The output end first electric capacity C1 of connection of operational amplifier U2A and the 3rd operational amplifier U2B, the first operational amplifier U3, second
The negative input end of operational amplifier U2A connects respectively the negative pole of the 4th resistance R4, the 6th resistance R6 and the first pole pipe D1, and the 4th is electric
The other end of resistance R4 is connected respectively with the first electric capacity C1 other ends, the 8th resistance R8, the 8th resistance R8 other ends and the 3rd computing
The negative input end of amplifier U2B is connected, the output of another termination amplifying circuits of the first electric capacity C1, and the positive pole of the first pole pipe D1 connects the
The output of two operational amplifier U2A, the positive pole of the 6th resistance R6 the second pole pipes D2 of another termination, the negative pole of the second pole pipe D2 connects the
The output of two operational amplifier U2A, a second operational amplifier U2A positive input terminals of termination of the 5th resistance R5, the 5th resistance R5
The other end ground connection.7th resistance R7 connects respectively the negative input end of the 3rd operational amplifier U2B and the negative pole of the second pole pipe D2, the
The negative input end of three operational amplifier U2B is connected by the output end of the 9th resistance R9 and the 3rd operational amplifier U2B, the 3rd fortune
The positive input terminal for calculating amplifier U2B is grounded by the tenth resistance R10, as shown in Figure 3.Detecting circuit is using operational amplifier and general
The active rectifying circuit of logical diode composition, can effectively solve the problem that the nonlinear characteristic of diode and the impact of threshold voltage,
On the basis of linear detector, plus one-level adder, allow input signal another polar voltages without detection, and be directly sent to plus
Musical instruments used in a Buddhist or Taoist mass, is added with the output voltage from wave detector, constitutes accurate absolute value circuit.
The output of the 3rd amplifier U2B meets the 12nd resistance R12, and the negative input end of four-operational amplifier U2C connects respectively
The output end of 15 resistance R15 and the 16th resistance R16, the 15th resistance R15 other ends and four-operational amplifier U2C connects
Connect, the 16th resistance R16 other ends ground connection, the positive input terminal of four-operational amplifier U2C meets respectively the 3rd electric capacity C3 and the tenth
Three resistance R13, the 3rd electric capacity C3 other ends ground connection, another termination the second electric capacity C2 and the 12nd resistance R12 of the 13rd resistance R13
The other end, the output end connection of the second electric capacity C2 other ends and four-operational amplifier U2C, four-operational amplifier U2C is defeated
Go out end to connect by the positive input terminal of the 17th resistance R17 and the 5th operational amplifier U2D, the 5th operational amplifier U2D's is negative
Input is connected by the output end of the 18th resistance R18 and the 5th operational amplifier U2D, as shown in figure 4, filter circuit is adopted
The second-order low-pass filter of double operational voltage mode, realizes the characteristic of the Parameter adjustable of low pass filter.
U3 adopts ADC620, U2A, U2B, U2C and U2D to adopt TL084, R1 to adopt the potentiometer of 50K, R2 and R3 to adopt in figure
1MEG resistance, R4, R6, R9 is used to adopt 20K resistance, R5, R7 and R17 to adopt 10K resistance, R10 to adopt 3.3K resistance, D1 and D2 to adopt
3K resistance, R15, R16 and R18 is adopted to adopt 100k resistance, C1, C2 and C3 to adopt 1UF electric capacity, fortune with D1N4148, R12 and R13
Calculate amplifier and adopt positive and negative 12V power voltage supplies.
When signal is in amplifying circuit, U3 inputs institute connecting resistance R2 and R3, for suppressing null offset, signal is through U3
Detecting circuit is sent into after amplification.When signal is in detecting circuit, when input signal U1out>When 0, U2A output U2Aout<0, two poles
Pipe D2 conducting D1 are turned off, then U2Aout=-2U1out, then U2AoutWith U1outDetecting circuit is obtained after superposition Jing after U2B is reverse to export
Voltage U2Bout=U1out, when input signal U1out<When 0, U2A output U2Aout>0, D1 conducting D2 shut-offs, U2A is operated in deep negative
Feedback states, so U2Aout=0, then U2AoutWith U1outAfter superposition Jing after U2B is reverse detecting circuit output voltage U2Bout
=U1out.So as to realize circuit detection function and by after detection signal send into filter circuit, signal be in filter circuit when,
First pass through and constitute Sallen-Key low pass filters for core by U2C, R12, R13, C2 and C3, the low-pass filter structure letter
Singly, pole angular and quality factor are easy to adjust, and adjustable extent is big, and last signal is obtained through the 5th operational amplifier U2D
Export after gain, signal is through three above modular circuit so as to reaching the purpose of signal condition.
The utility model is exemplarily described above in conjunction with accompanying drawing, it is clear that the utility model is implemented not to be received
The restriction of aforesaid way, as long as employing changing for the various unsubstantialities that method design of the present utility model and technical scheme are carried out
Enter, or it is not improved by it is of the present utility model design and technical scheme directly apply to other occasions, in the utility model
Protection domain within.The protection domain that protection domain of the present utility model should be limited by claims is defined.
Claims (4)
1. a kind of signal regulating device for sensor, it is characterised in that the signal regulating device includes amplifying circuit, inspection
Wave circuit and filter circuit, the signal input from sensor is to amplifying circuit, amplifying circuit connection detecting circuit, detecting circuit
Connection filter circuit, the output signal after filter circuit output conditioning, in amplifying circuit, first resistor R1 and the first amplifier U3
Outside gain arranges end and is connected, the input of second resistance R2 and 3rd resistor R3 the first operational amplifier U3 of access.
2. the signal regulating device for sensor according to claim 1, it is characterised in that the detecting circuit includes
Second operational amplifier U2A, the 3rd operational amplifier U2B, the first pole pipe D1, the second pole pipe D2, the first electric capacity C1 and multiple electricity
Resistance, the output end of amplifying circuit connects the first electric capacity C1, and the first electric capacity C1 is connected to the second operational amplifier U2A's by resistance
Negative input end, the positive pole of the first pole pipe D1 is connected to the output end of the second operational amplifier U2A, and negative pole connects the second operation amplifier
The negative input end of device U2A, the negative pole of the second pole pipe D2 connects the output end of the second operational amplifier U2A, the positive pole of the second pole pipe D2
The negative input end of the 3rd operational amplifier U2B is connected by resistance.
3. the signal regulating device for sensor according to claim 1, it is characterised in that the filter circuit includes
Second-order low-pass filter circuit, the 5th operational amplifier U2D and multiple resistance, the output end connection step low-pass filter of detecting circuit
Ripple device circuit, the output end of second-order low-pass filter circuit connects the positive input terminal of the 5th operational amplifier U2D by resistance, the
A resistance is connected between the negative input end and output end of five operational amplifier U2D.
4. the signal regulating device for sensor according to claim 3, it is characterised in that the second-order low-pass filter
Device circuit includes four-operational amplifier U2C, multiple resistance and electric capacity, and the output end of detecting circuit is transported by resistance connection the 4th
The positive input terminal of amplifier U2C is calculated, the output end of four-operational amplifier U2C connects the 5th operational amplifier U2D by resistance
Positive input terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621238660.4U CN206135879U (en) | 2016-11-19 | 2016-11-19 | A signal conditioning device for sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621238660.4U CN206135879U (en) | 2016-11-19 | 2016-11-19 | A signal conditioning device for sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206135879U true CN206135879U (en) | 2017-04-26 |
Family
ID=58562456
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621238660.4U Expired - Fee Related CN206135879U (en) | 2016-11-19 | 2016-11-19 | A signal conditioning device for sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206135879U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107167714A (en) * | 2017-06-13 | 2017-09-15 | 珠海市脉迅科技有限公司 | A kind of low current synchronous signal sensor device |
| CN108828392A (en) * | 2018-08-10 | 2018-11-16 | 江苏波普电力科技有限公司 | A kind of electricity cut-off type electric leakage signal recognition methods and electricity cut-off type electric leakage detector |
| CN109001796A (en) * | 2018-06-12 | 2018-12-14 | 西安陆海地球物理科技有限公司 | A kind of geophone signal conditioning circuit |
| CN109188055A (en) * | 2018-09-29 | 2019-01-11 | 江苏微能电子科技有限公司 | A kind of voltage sensor modular circuit based on 80CXX type single-chip microcontroller |
| CN112666397A (en) * | 2020-11-27 | 2021-04-16 | 大连理工大学 | Detection circuit and detection method for contact impedance of negative plate of high-frequency electrotome |
| CN112798866A (en) * | 2020-12-31 | 2021-05-14 | 中天海洋系统有限公司 | Conductivity signal acquisition circuit and testing device |
-
2016
- 2016-11-19 CN CN201621238660.4U patent/CN206135879U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107167714A (en) * | 2017-06-13 | 2017-09-15 | 珠海市脉迅科技有限公司 | A kind of low current synchronous signal sensor device |
| CN109001796A (en) * | 2018-06-12 | 2018-12-14 | 西安陆海地球物理科技有限公司 | A kind of geophone signal conditioning circuit |
| CN108828392A (en) * | 2018-08-10 | 2018-11-16 | 江苏波普电力科技有限公司 | A kind of electricity cut-off type electric leakage signal recognition methods and electricity cut-off type electric leakage detector |
| CN109188055A (en) * | 2018-09-29 | 2019-01-11 | 江苏微能电子科技有限公司 | A kind of voltage sensor modular circuit based on 80CXX type single-chip microcontroller |
| CN112666397A (en) * | 2020-11-27 | 2021-04-16 | 大连理工大学 | Detection circuit and detection method for contact impedance of negative plate of high-frequency electrotome |
| CN112666397B (en) * | 2020-11-27 | 2024-03-19 | 大连理工大学 | High-frequency electrotome negative plate contact impedance detection circuit and detection method |
| CN112798866A (en) * | 2020-12-31 | 2021-05-14 | 中天海洋系统有限公司 | Conductivity signal acquisition circuit and testing device |
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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 |
Granted publication date: 20170426 Termination date: 20171119 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |