CN204517762U - A kind of enlarge leadingly pre-process circuit being applied to the process of PIR signal digital - Google Patents
A kind of enlarge leadingly pre-process circuit being applied to the process of PIR signal digital Download PDFInfo
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- CN204517762U CN204517762U CN201420794803.4U CN201420794803U CN204517762U CN 204517762 U CN204517762 U CN 204517762U CN 201420794803 U CN201420794803 U CN 201420794803U CN 204517762 U CN204517762 U CN 204517762U
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Abstract
In order to solve parameter tuning difficult, summer detecting distance shorten, existing PIR to problems such as AD required precision are very high, the signal that pir sensor exports by the enlarge leadingly pre-process circuit of the PIR of being applied to signal digital described in the utility model process imports the AD converter of single-chip microcomputer after filtering again into through an advance signal preliminary treatment and in addition.Not only reduce like this requirement of Chip Microcomputer A/D performance but also improve the sensitivity detected summer.The enlarge leadingly pre-process circuit of the described PIR of being applied to signal digital process comprises pir sensor circuit, first order amplification treatment circuit, second level amplification treatment circuit, low-pass filter circuit, voltage-stabilized power supply circuit.
Description
Technical field
The utility model relates to a kind of enlarge leadingly pre-process circuit being applied to the process of PIR signal digital.
Background technology
Existingly utilize perception human body self heat to send infrared signal detecting to there is the automatic control circuit of people, passive infrared radiation (Passive Infrared Radiation, initialism the is PIR) transducer mostly adopted.Wavelength can be the infrared signal change transitions between 8-12um by this transducer is the signal of telecommunication, and can be inhibited to the white light signal of occurring in nature, therefore in the security area of passive infrared detector.But existing PIR technology is divided into two kinds substantially, one adopts simulation process, and typical case wherein uses biss0001 special chip exactly; Another kind adopts digital processing, the signal exported by pir sensor is directly sent to the input pin of built-in AD (i.e. analog-to-digital conversion) transducer of single-chip microcomputer, the place of its deficiency is to be input to weak output signal in AD, very high to the required precision of Chip Microcomputer A/D, but also when being easily subject to such environmental effects such as summer, sensitivity obviously reduces.
Summary of the invention
In order to solve parameter tuning difficult, summer detecting distance shorten, existing PIR to problems such as AD required precision are very high, the signal that circuit pir sensor described in the utility model exports through an advance signal preliminary treatment and in addition imports Chip Microcomputer A/D into after filtering again.Not only reduce like this requirement of Chip Microcomputer A/D performance but also improve the sensitivity detected summer.
The utility model adopted technical scheme of dealing with problems is: described in be applied to the process of PIR signal digital enlarge leadingly pre-process circuit comprise pir sensor circuit, first order amplification treatment circuit, second level amplification treatment circuit, low-pass filter circuit, voltage-stabilized power supply circuit.
Described pir sensor circuit comprises a resistance, two electric capacity, its components and parts annexation is as follows: pir sensor power pins 1 is connected with VDDA together with one end of electric capacity C1, the signal output pin 2 of pir sensor is connected with one end with resistance R3, one end of electric capacity C3, the grounding pin 3 of PIR sensing and the equal ground connection of the other end of the electric capacity C1 other end, the electric capacity C3 other end and resistance R3.
Described first order amplification treatment circuit comprises an operational amplifier, three resistance, two electric capacity, its components and parts annexation is as follows: one end of resistance R1 is connected with the output pin 2 of pir sensor, and the other end is connected with the forward input pin 3 of operational amplifier together with one end of electric capacity C2.The reverse input pin 2 of operational amplifier is connected with one end of one end of resistance R2, electric capacity C4 and one end of resistance R4.The signal output pin 1 of the other end with operational amplifier together with the other end of electric capacity C4 of resistance R2 is connected.The other end of resistance R4 is connected with one end of electric capacity C5.One other end of electric capacity C5 is connected with the other end of electric capacity C2 ground connection.
Described second level amplification treatment circuit comprises an operational amplifier, five resistance, six electric capacity, its components and parts annexation is as follows: one end of electric capacity C7 is connected with the output pin 1 of operational amplifier in first order amplification treatment circuit, and the other end of C7 is connected with one end of resistance R7.The reverse input pin 6 of the other end of resistance R7 with operational amplifier together with one end of one end of electric capacity C6, resistance R5 is connected.The output pin 7 of the other end with operational amplifier together with the other end of resistance R5 of electric capacity C6 is connected.The forward input pin 5 of operational amplifier is connected with one end of resistance R9.The other end of resistance R9 is connected with one end of resistance R6, resistance R10, electric capacity C9, electric capacity C10.The other end of resistance R6 is connected with VDDA.The equal ground connection of the other end of the other end of electric capacity C9, the other end of electric capacity C10 and resistance R10.The grounding pin ground connection of operational amplifier.The power pins 8 of operational amplifier is connected with one end of electric capacity C12, electric capacity C11 VDDA.The other end of electric capacity C12 and the equal ground connection of the other end of electric capacity C11.
Described low-pass filter circuit comprises a resistance, an electric capacity, its components and parts annexation is as follows: one end of resistance R8 is connected with the output pin 7 of second level amplification treatment circuit operational amplifier, and the other end is connected with one end of electric capacity C8, the other end ground connection of electric capacity C8.
Described voltage-stabilized power supply circuit comprises a stabilized voltage power supply, four electric capacity, and its components and parts annexation is as follows: the input pin 2 of stabilized voltage power supply is connected with one end of electric capacity C15, electric capacity C16+12V power supply.The output pin 3 of stabilized voltage power supply is connected with one end of electric capacity C13, electric capacity C14 VDDA.The other end of electric capacity C13, electric capacity C14, electric capacity C15, electric capacity C16 and the equal ground connection of earth terminal pin of stabilized voltage power supply.
Technical problem of the present utility model is solved by following further technical scheme.
Described resistance R3 and PIR outputs signal formation impedance matching and obtains signal to greatest extent.
Described electric capacity C7 has the function of stopping direct current.
The utility model is a kind of discharge circuit being applied to digital PIR, and its concrete operation principle is as follows.
Described VDDA powers to pir sensor after signal transacting, the output signal of pir sensor enters first order amplification treatment circuit after filtering after its output pin 2 exports, direct current is followed, high-frequency ac major part flows to ground, low-frequency ac is exaggerated after filtering, enters the filtering again after anti-phase amplification of second level amplification treatment circuit again, finally exports.
The beneficial effects of the utility model after suitably amplifying, make it be more suitable for single-chip microcomputer digitized processing the primary signal of PIR, reduces the requirement to Chip Microcomputer A/D performance, improves the sensitivity detected summer.
Accompanying drawing explanation
Fig. 1 is the utility model pir sensor circuit theory diagrams.
Fig. 2 is the utility model first order amplification treatment circuit schematic diagram.
Fig. 3 is the utility model second level amplification treatment circuit schematic diagram.
Fig. 4 is the utility model low-pass filter circuit schematic diagram.
Fig. 5 is the utility model voltage-stabilized power supply circuit schematic diagram.
Embodiment
That described pir sensor adopts is double base pyroelectric infrared sensor RE200B.RE200B adopts pyroelectricity material to polarize temperature variant property detection infrared radiation, and the interference coordinating two sensitive first complementarity method to suppress variations in temperature to produce, improve the job stability of transducer.
Described electric capacity C1, C12, C14, C15 capacitance size is 0.1uF, and electric capacity C2, C3, C4, C6, C10 are 0.01uF.Described electric capacity C5 size is 47uF, C7, C9, C11, C13 are 10uF, and electric capacity C8 is 2.2uF, and electric capacity C16 is 100uF.
Described resistance R10 is 2K, and resistance R6 is 6.7K, and resistance R1, R4 are 18K, and resistance R8 is 18.3K, and resistance R3 is 47K, and resistance R7, R9 are 100K, and resistance R5 is 600K, and resistance R2 is 1M.
Described operational amplifier is LM358.
That described stabilized voltage power supply adopts is MD7150.
Described first order amplification treatment circuit comprises an operational amplifier, three resistance, two electric capacity, its components and parts annexation is as follows: one end of resistance R1 is connected with the output pin 2 of pir sensor, and the other end is connected with the forward input pin 3 of operational amplifier together with one end of electric capacity C2.The reverse input pin 2 of operational amplifier is connected with one end of one end of resistance R2, electric capacity C4 and one end of resistance R4.The signal output pin 1 of the other end with operational amplifier together with the other end of electric capacity C4 of resistance R2 is connected.The other end of resistance R4 is connected with one end of electric capacity C5.One other end of electric capacity C5 is connected with the other end of electric capacity C2 ground connection.
Described second level amplification treatment circuit comprises an operational amplifier, five resistance, six electric capacity, its components and parts annexation is as follows: one end of electric capacity C7 is connected with the output pin 1 of operational amplifier in first order amplification treatment circuit, and the other end of C7 is connected with one end of resistance R7.The reverse input pin 6 of the other end of resistance R7 with operational amplifier together with one end of one end of electric capacity C6, resistance R5 is connected.The output pin 7 of the other end with operational amplifier together with the other end of resistance R5 of electric capacity C6 is connected.The forward input pin 5 of operational amplifier is connected with one end of resistance R9.The other end of resistance R9 is connected with one end of resistance R6, resistance R10, electric capacity C9, electric capacity C10.The other end of resistance R6 is connected with VDDA.The equal ground connection of the other end of the other end of electric capacity C9, the other end of electric capacity C10 and resistance R10.The grounding pin ground connection of operational amplifier.The power pins 8 of operational amplifier is connected with one end of electric capacity C12, electric capacity C11 VDDA.The other end of electric capacity C12 and the equal ground connection of the other end of electric capacity C11.
Below in conjunction with circuit theory diagrams, this utility model is further described.
VDDA is by powering to pir sensor after electric capacity C1 filtering, and PIR output signal enters one-level in-phase amplification circuit after filtering, and high-frequency ac flows to ground, and direct current component is formed through dual operational amplifier and follows.Signal flows to second dual operational amplifier by C4, R3.After the filter circuit filtering of C9 and C10 composition, enter secondary see-saw circuit, then export after filtering.
In figure, the effect of C7 electric capacity is stopping direct current.
In figure, the effect of resistance R9 makes bias voltage more stable.
Claims (2)
1. one kind is applied to the enlarge leadingly pre-process circuit of PIR signal digital process, comprise signal pre-processing circuit, one-level in-phase amplification circuit, secondary see-saw circuit, filter circuit, auxiliary power circuit, the enlarge leadingly pre-process circuit being applied to the process of PIR signal digital described in it is characterized in that comprises pir sensor circuit, first order amplification treatment circuit, second level amplification treatment circuit, low-pass filter circuit, voltage-stabilized power supply circuit, described pir sensor circuit comprises a resistance, two electric capacity, its components and parts annexation is as follows: pir sensor power pins 1 is connected with VDDA together with one end of electric capacity C1, the signal output pin 2 of pir sensor is connected with one end with resistance R3, one end of electric capacity C3, grounding pin 3 and the electric capacity C1 other end of PIR sensing, the equal ground connection of the other end of the electric capacity C3 other end and resistance R3, described first order amplification treatment circuit comprises an operational amplifier, three resistance, two electric capacity, its components and parts annexation is as follows: one end of resistance R1 is connected with the output pin 2 of pir sensor, and the other end is connected with the forward input pin 3 of operational amplifier together with one end of electric capacity C2, the reverse input pin 2 of operational amplifier is connected with one end of one end of resistance R2, electric capacity C4 and one end of resistance R4, the signal output pin 1 of the other end with operational amplifier together with the other end of electric capacity C4 of resistance R2 is connected, the other end of resistance R4 is connected with one end of electric capacity C5, and the other end of electric capacity C5 is connected with the other end of electric capacity C2 ground connection, described second level amplification treatment circuit comprises an operational amplifier, five resistance, six electric capacity, its components and parts annexation is as follows: one end of electric capacity C7 is connected with the output pin 1 of operational amplifier in first order amplification treatment circuit, the other end of C7 is connected with one end of resistance R7, the other end of resistance R7 and one end of electric capacity C6, one end of resistance R5 is connected with the reverse input pin 6 of operational amplifier together, the output pin 7 of the other end with operational amplifier together with the other end of resistance R5 of electric capacity C6 is connected, the forward input pin 5 of operational amplifier is connected with one end of resistance R9, the other end of resistance R9 and resistance R6, resistance R10, electric capacity C9, one end of electric capacity C10 is connected, the other end of resistance R6 is connected with VDDA, the other end of electric capacity C9, the other end of electric capacity C10 and the equal ground connection of the other end of resistance R10, the grounding pin ground connection of operational amplifier, power pins 8 and the electric capacity C12 of operational amplifier, one end of electric capacity C11 is connected VDDA, the other end of electric capacity C12 and the equal ground connection of the other end of electric capacity C11, described low-pass filter circuit comprises a resistance, an electric capacity, its components and parts annexation is as follows: one end of resistance R8 is connected with the output pin 7 of second level amplification treatment circuit operational amplifier, and the other end is connected with one end of electric capacity C8, the other end ground connection of electric capacity C8, described voltage-stabilized power supply circuit comprises a stabilized voltage power supply, four electric capacity, its components and parts annexation is as follows: the input pin 2 of stabilized voltage power supply is connected with one end of electric capacity C15, electric capacity C16+12V power supply, the output pin 3 of stabilized voltage power supply is connected with one end of electric capacity C13, electric capacity C14 VDDA, electric capacity C13, electric capacity C14, electric capacity C15, the other end of electric capacity C16 and the equal ground connection of earth terminal pin of stabilized voltage power supply.
2. the enlarge leadingly pre-process circuit being applied to the process of PIR signal digital according to claim 1, it is characterized in that RE200B selected by transducer, dual operational amplifier selects LM358, and stabilized voltage power supply selects MD7150.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420794803.4U CN204517762U (en) | 2014-12-17 | 2014-12-17 | A kind of enlarge leadingly pre-process circuit being applied to the process of PIR signal digital |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420794803.4U CN204517762U (en) | 2014-12-17 | 2014-12-17 | A kind of enlarge leadingly pre-process circuit being applied to the process of PIR signal digital |
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| CN204517762U true CN204517762U (en) | 2015-07-29 |
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| CN201420794803.4U Expired - Fee Related CN204517762U (en) | 2014-12-17 | 2014-12-17 | A kind of enlarge leadingly pre-process circuit being applied to the process of PIR signal digital |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106604503A (en) * | 2016-12-14 | 2017-04-26 | 湖北工业大学 | Adaptive PIR circuit applied to solar illumination device |
| CN106685373A (en) * | 2017-01-04 | 2017-05-17 | 四川友邻有家电子商务有限公司 | Signal amplification circuit of double-screen all-in-one machine |
-
2014
- 2014-12-17 CN CN201420794803.4U patent/CN204517762U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106604503A (en) * | 2016-12-14 | 2017-04-26 | 湖北工业大学 | Adaptive PIR circuit applied to solar illumination device |
| CN106604503B (en) * | 2016-12-14 | 2019-03-22 | 湖北工业大学 | Adaptive PI R circuit applied to solar illumination apparatus |
| CN106685373A (en) * | 2017-01-04 | 2017-05-17 | 四川友邻有家电子商务有限公司 | Signal amplification circuit of double-screen all-in-one machine |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150729 Termination date: 20151217 |
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| EXPY | Termination of patent right or utility model |