CN206673918U - Pyroelectricity signal amplification circuit filter - Google Patents
Pyroelectricity signal amplification circuit filter Download PDFInfo
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- CN206673918U CN206673918U CN201720490798.1U CN201720490798U CN206673918U CN 206673918 U CN206673918 U CN 206673918U CN 201720490798 U CN201720490798 U CN 201720490798U CN 206673918 U CN206673918 U CN 206673918U
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- resistance
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- operational amplifier
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Abstract
Pyroelectricity signal amplification circuit filter, belong to pyroelectricity signal technical field of filtering.The utility model is to solve the problems, such as that existing pyroelectric sensor can not effectively distinguish Studies of Human Body Heat source and inhuman body heat source signal.It carries out high-pass filtering by the high-pass filtering circuit that resistance R1 and electric capacity C1 is formed to signal, filters out the influence of low frequency signal；Again by the second-order low-pass filter circuit being made up of dual operational amplifier U1 and resistance R2, resistance R3, electric capacity C2, electric capacity C3, resistance R4, resistance R5, the high-frequency signal as caused by inhuman body heat source is removed, and carries out a signal amplification；Filtered again by electric capacity C4, signal after filtering enters the see-saw circuit being made up of dual operational amplifier U2, resistance R6, resistance R7, resistance R8, resistance R10, electric capacity C5 and slide rheostat R9, carry out second of signal amplification, change slide rheostat R9 resistance, the amplification coefficient of see-saw circuit can be changed.The amplification that the utility model is used for pyroelectricity signal filters.
Description
Technical field
Pyroelectricity signal amplification circuit filter is the utility model is related to, belongs to pyroelectricity signal technical field of filtering.
Background technology
Pyroelectric infrared sensor can detect the infra-red radiation that human body is sent, if to the infrared radiation signal detected
Correlated characteristic information is extracted, and is analyzed and processed, the rough location information of human body target can be obtained.But due to human body
Or other kinds thermal source launches electromagnetic wave all there may be spontaneous infrared radiation, when under the external environment that human body is in complicated
When, the interference of other thermal source signals is highly susceptible to the location determination of human body, therefore, it is necessary to excluded by effective measures inhuman
Body heat source, so as to improve human body positioning precision.
Existing pyroelectric sensor is neither amplified after infrared signal is received to useful signal, also not to interference
Signal is effectively filtered, to remove interference so that can not effectively distinguish Studies of Human Body Heat source and inhuman body heat source signal.
The content of the invention
The purpose of the utility model be in order to solve existing pyroelectric sensor can not effectively distinguish Studies of Human Body Heat source with it is non-human
A kind of the problem of thermal source signal, there is provided pyroelectricity signal amplification circuit filter.
Pyroelectricity signal amplification circuit filter described in the utility model, it includes resistance R1, resistance R2, resistance R3, resistance
R4, resistance R5, resistance R6, resistance R7, resistance R8, slide rheostat R9, resistance R10, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity
C4, electric capacity C5, electric capacity C6, polar capacitor C7, dual operational amplifier U1 and dual operational amplifier U2,
Resistance R1 is connected between pyroelectric infrared sensor U3 source S and grid G, grid G ground connection, and drain D connection+
5V power supplys；Electric capacity is sequentially connected between pyroelectric infrared sensor U3 source S and dual operational amplifier U1 inverting input
C1, resistance R2 and resistance R3, electric capacity C2 one end are connected between resistance R2 and resistance R3, electric capacity C2 other end ground connection；
Dual operational amplifier U1 in-phase input end connection resistance R4 one end, resistance R4 other end ground connection；Double computings
Resistance R5 is connected between amplifier U1 inverting input and output end, electric capacity C3 is in parallel with resistance R5；
Electric capacity C4 is sequentially connected between dual operational amplifier U1 output end and dual operational amplifier U2 inverting input
With resistance R6, dual operational amplifier U2 in-phase input end connection resistance R10 one end, resistance R10 other end ground connection；Double fortune
Calculate amplifier U2 in-phase input end connection resistance R7 one end, resistance R7 another termination+5V power supplys；Dual operational amplifier U2
Inverting input and output end between connect electric capacity C5, resistance R8 and slide rheostat R9 series connection after it is in parallel with electric capacity C5, cunning
Dynamic rheostat R9 sliding end connection dual operational amplifier U2 output end；Dual operational amplifier U2 output end is as filtered electrical
The output end on road；
Polar capacitor C7 positive pole connection+5V power supplys, polar capacitor C7 negative pole ground connection, electric capacity C6 and polar capacitor C7 is simultaneously
Connection.
The advantages of the utility model：The amplification that the utility model is used for human perception positioning signal filters, and it passes through resistance
The signal that the high-pass filtering circuit that R1 and electric capacity C1 is formed collects to pyroelectric infrared sensor carries out high-pass filtering, filters out
The influence of low frequency signal.Followed by by dual operational amplifier U1 and resistance R2, resistance R3, electric capacity C2, electric capacity C3, resistance
The second-order low-pass filter circuit that R4, resistance R5 are formed, using second-order filter, removes the high-frequency signal as caused by inhuman body heat source,
And carry out a signal amplification.Signal after second-order low-pass filter is once filtered again by electric capacity C4 again, filtering
Signal afterwards will enter by dual operational amplifier U2, resistance R6, resistance R7, resistance R8, resistance R10, electric capacity C5 and slide change
The see-saw circuit of device R9 compositions is hindered, second of signal amplification is carried out, wherein the resistance by changing slide rheostat R9, changes
Become the amplification coefficient of see-saw circuit.The utility model ensure that final output is believed by two anti-phase filtering and amplifying circuits
Number polarity it is constant, and successfully filtered out the low frequency signal and disturbance ecology human body thermal source and non-human that interference is produced to circuit
The high-frequency signal of thermal source, ensure signal band logical by, auxiliary pyroelectric infrared sensor correctly identify human body thermal source with it is non-
Human body thermal source.
Brief description of the drawings
Fig. 1 is the circuit theory diagrams of pyroelectricity signal amplification circuit filter described in the utility model.
Embodiment
Embodiment one：Illustrate present embodiment with reference to Fig. 1, pyroelectricity signal described in present embodiment amplifies
Filter circuit, it includes resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, resistance R8, slip change
Resistance device R9, resistance R10, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, electric capacity C5, electric capacity C6, polar capacitor C7, double computings are put
Big device U1 and dual operational amplifier U2,
Resistance R1 is connected between pyroelectric infrared sensor U3 source S and grid G, grid G ground connection, and drain D connection+
5V power supplys；Electric capacity is sequentially connected between pyroelectric infrared sensor U3 source S and dual operational amplifier U1 inverting input
C1, resistance R2 and resistance R3, electric capacity C2 one end are connected between resistance R2 and resistance R3, electric capacity C2 other end ground connection；
Dual operational amplifier U1 in-phase input end connection resistance R4 one end, resistance R4 other end ground connection；Double computings
Resistance R5 is connected between amplifier U1 inverting input and output end, electric capacity C3 is in parallel with resistance R5；
Electric capacity C4 is sequentially connected between dual operational amplifier U1 output end and dual operational amplifier U2 inverting input
With resistance R6, dual operational amplifier U2 in-phase input end connection resistance R10 one end, resistance R10 other end ground connection；Double fortune
Calculate amplifier U2 in-phase input end connection resistance R7 one end, resistance R7 another termination+5V power supplys；Dual operational amplifier U2
Inverting input and output end between connect electric capacity C5, resistance R8 and slide rheostat R9 series connection after it is in parallel with electric capacity C5, cunning
Dynamic rheostat R9 sliding end connection dual operational amplifier U2 output end；Dual operational amplifier U2 output end is as filtered electrical
The output end Out on road；
Polar capacitor C7 positive pole connection+5V power supplys, polar capacitor C7 negative pole ground connection, electric capacity C6 and polar capacitor C7 is simultaneously
Connection.
In present embodiment, polar capacitor C7 is in parallel with electric capacity C6, constitutes filter circuit, for being produced in integrated circuit
Raw fluctuation is filtered out, and ensures that power supply is interference-free；Pyroelectric infrared sensor U3 drain D use+5V power supplys provide electricity
Can, the information that source S is identified is sent out in the form of voltage signal；Resistance R1 and nonpolar electric capacity C1 forms high pass filter
Wave circuit, the voltage signal of source S output is filtered；Dual operational amplifier U1 and resistance R2, resistance R3, electric capacity C2, electricity
Hold C3, resistance R4 and resistance R5 and constitute second-order low-pass filter circuit, second-order low-pass filter is carried out to the signal received, and put
This big signal；Electric capacity C4 is filtered as filter capacitor to dual operational amplifier U1 output signal；Dual operational amplifier
The anti-phase amplification low pass electricity that U2, resistance R6, resistance R7, resistance R8, resistance R10, electric capacity C5 and slide rheostat R9 are formed
Road, secondary amplification and filtering are carried out to the signal of pyroelectric infrared sensor U3 identifications, by the value for changing slide rheostat R9
Second of amplification coefficient can be modified.
Embodiment two：Illustrate present embodiment with reference to Fig. 1, present embodiment is made into one to embodiment one
Step explanation, dual operational amplifier U1 and dual operational amplifier U2 are LM358 chips, No. 8 pin connection+5V of LM358 chips
Power supply, No. 4 pin ground connection.
Claims (2)
1. a kind of pyroelectricity signal amplification circuit filter, it is characterised in that it includes resistance R1, resistance R2, resistance R3, resistance
R4, resistance R5, resistance R6, resistance R7, resistance R8, slide rheostat R9, resistance R10, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity
C4, electric capacity C5, electric capacity C6, polar capacitor C7, dual operational amplifier U1 and dual operational amplifier U2,
Resistance R1 is connected between pyroelectric infrared sensor U3 source S and grid G, grid G ground connection, drain D connection+5V electricity
Source；Electric capacity C1, electricity are sequentially connected between pyroelectric infrared sensor U3 source S and dual operational amplifier U1 inverting input
R2 and resistance R3 is hindered, electric capacity C2 one end is connected between resistance R2 and resistance R3, electric capacity C2 other end ground connection；
Dual operational amplifier U1 in-phase input end connection resistance R4 one end, resistance R4 other end ground connection；Double operation amplifiers
Resistance R5 is connected between device U1 inverting input and output end, electric capacity C3 is in parallel with resistance R5；
Electric capacity C4 and electricity are sequentially connected between dual operational amplifier U1 output end and dual operational amplifier U2 inverting input
Hinder R6, dual operational amplifier U2 in-phase input end connection resistance R10 one end, resistance R10 other end ground connection；Double computings are put
Big device U2 in-phase input end connection resistance R7 one end, resistance R7 another termination+5V power supplys；Dual operational amplifier U2's is anti-
In parallel with electric capacity C5 after electric capacity C5, resistance R8 and slide rheostat R9 connect, slip change is connected between phase input and output end
Hinder device R9 sliding end connection dual operational amplifier U2 output end；Dual operational amplifier U2 output end is as filter circuit
Output end；
Polar capacitor C7 positive pole connection+5V power supplys, polar capacitor C7 negative pole ground connection, electric capacity C6 are in parallel with polar capacitor C7.
2. pyroelectricity signal amplification circuit filter according to claim 1, it is characterised in that dual operational amplifier U1 and double
Operational amplifier U2 is LM358 chips, No. 8 pin connection+5V power supplys of LM358 chips, No. 4 pins ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720490798.1U CN206673918U (en) | 2017-05-04 | 2017-05-04 | Pyroelectricity signal amplification circuit filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720490798.1U CN206673918U (en) | 2017-05-04 | 2017-05-04 | Pyroelectricity signal amplification circuit filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206673918U true CN206673918U (en) | 2017-11-24 |
Family
ID=60371906
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720490798.1U Expired - Fee Related CN206673918U (en) | 2017-05-04 | 2017-05-04 | Pyroelectricity signal amplification circuit filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206673918U (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108111130A (en) * | 2017-12-29 | 2018-06-01 | 西安柒凌防务科技有限公司 | A kind of amplifying circuit for infrared detection system |
| CN108332377A (en) * | 2018-02-07 | 2018-07-27 | 徐宏亮 | A kind of air conditioner and its control method |
| CN108332376A (en) * | 2018-02-07 | 2018-07-27 | 徐宏亮 | A kind of air conditioner and its control method |
| CN108332350A (en) * | 2018-02-07 | 2018-07-27 | 徐宏亮 | A kind of air conditioner and its control method |
| CN108964624A (en) * | 2018-06-14 | 2018-12-07 | 吉林大学 | A kind of front end circuit of pyroelectric infrared sensor |
| CN109617391A (en) * | 2018-12-25 | 2019-04-12 | 西安理工大学 | The switch power supply EMI filter and its design method of stepless controllable rejection ability |
| CN110208827A (en) * | 2019-05-23 | 2019-09-06 | 罗金林 | A kind of anti-missing system of pulse |
| CN113126611A (en) * | 2019-12-31 | 2021-07-16 | 深圳飞科机器人有限公司 | Autonomous mobile robot |
-
2017
- 2017-05-04 CN CN201720490798.1U patent/CN206673918U/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108111130A (en) * | 2017-12-29 | 2018-06-01 | 西安柒凌防务科技有限公司 | A kind of amplifying circuit for infrared detection system |
| CN108332377A (en) * | 2018-02-07 | 2018-07-27 | 徐宏亮 | A kind of air conditioner and its control method |
| CN108332376A (en) * | 2018-02-07 | 2018-07-27 | 徐宏亮 | A kind of air conditioner and its control method |
| CN108332350A (en) * | 2018-02-07 | 2018-07-27 | 徐宏亮 | A kind of air conditioner and its control method |
| CN108332350B (en) * | 2018-02-07 | 2020-09-29 | 浙江金恩食品科技股份有限公司 | Air conditioner and control method thereof |
| CN108332376B (en) * | 2018-02-07 | 2020-10-02 | 安徽硕日光电科技有限公司 | Air conditioner and control method thereof |
| CN108332377B (en) * | 2018-02-07 | 2020-12-08 | 上海玖辰实业有限公司 | Air conditioner and control method thereof |
| CN108964624A (en) * | 2018-06-14 | 2018-12-07 | 吉林大学 | A kind of front end circuit of pyroelectric infrared sensor |
| CN109617391A (en) * | 2018-12-25 | 2019-04-12 | 西安理工大学 | The switch power supply EMI filter and its design method of stepless controllable rejection ability |
| CN110208827A (en) * | 2019-05-23 | 2019-09-06 | 罗金林 | A kind of anti-missing system of pulse |
| CN113126611A (en) * | 2019-12-31 | 2021-07-16 | 深圳飞科机器人有限公司 | Autonomous mobile robot |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171124 Termination date: 20180504 |
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| CF01 | Termination of patent right due to non-payment of annual fee |