CN206432970U - Circuit is detected using LM324 low cost human sense - Google Patents
Circuit is detected using LM324 low cost human sense Download PDFInfo
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- CN206432970U CN206432970U CN201621480858.3U CN201621480858U CN206432970U CN 206432970 U CN206432970 U CN 206432970U CN 201621480858 U CN201621480858 U CN 201621480858U CN 206432970 U CN206432970 U CN 206432970U
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Abstract
The utility model discloses the low cost human sense detection circuit of use LM324 a kind of, for being connected with pyroelectric infrared sensor, including first and second operational amplifier, first and second comparator, switching tube.Above-mentioned people's sense detection circuit constitutes two-stage calculation amplifier by two amplifiers of the first operational amplifier and the second operational amplifier, the faint people sense detection signal detected by the pyroelectric infrared sensor is amplified, the first comparator and the second comparator constitute the window voltage comparator of about the two two-way amplitude discriminations of threshold, people's sense signal intensity to the output end output by the second operational amplifier is identified and judged, the low and high level interpretation exported simultaneously using the first end of back-end processor switch tube, which can detect, has no one close, so as to control the Push And Release of related load, realize automatic control function.Load can be closed when due to nobody, thus energy-conservation purpose can be reached.
Description
Technical field
The utility model is related to a kind of detection circuit, more particularly to a kind of use LM324 low cost human sense detection circuit.
Background technology
Due to people feel detection circuit can realize people to open, people remove the automatic control function that closes, so extensively should
For fields such as household electrical appliances, light fixture, automatically-controlled door and safety monitorings, automatically controlled and energy-saving significance with foolproof.But because heat is released
The signal that electric infrared sensor PIR is detected is very faint, and it to need by single-chip microcomputer to do signal amplification and processing on
Detect.Tradition application is above substantially is put using people's sense signal processing chip special BISS0001 etc. to people's sense signal
Big and processing, it is expensive.
Utility model content
The utility model embodiment technical problem to be solved is the provision of that a kind of cost is relatively low and the threshold of sensitivity
Adjustable use LM324 low cost human sense detection circuit.
A kind of use LM324 provided by the utility model low cost human sense detection circuit, is used for and rpyroelectric infrared
Sensor is connected, and the low cost human sense of use LM324 detection circuit includes first and second operational amplifier, first and the
Two comparators, switching tube, the signal pins of the pyroelectric infrared sensor and the in-phase input end phase of the first operational amplifier
Even, the in-phase input end of first operational amplifier is also grounded by first resistor, first operational amplifier it is anti-phase
Input is connected by second resistance with the output end of the first operational amplifier, the inverting input of first operational amplifier
Node between second resistance is grounded after being connected by 3rd resistor with the first electrochemical capacitor, first operational amplifier
Output end also passes sequentially through the first electric capacity and the 4th resistance is connected with the inverting input of the second operational amplifier, second fortune
The in-phase input end for calculating amplifier is connected by the 5th resistance with dc source, the 5th resistance and the second operational amplifier
Node between in-phase input end is by the 6th resistance eutral grounding, and the inverting input of second operational amplifier also directly passes through
7th resistance is connected with the output end of the second operational amplifier, the output end of second operational amplifier and first comparator
The in-phase input end of inverting input and the second comparator is connected, the dc source pass sequentially through the 8th resistance, the 9th resistance,
It is grounded after tenth resistance and the 11st resistance, the node between the 8th resistance and the 9th resistance is anti-phase with the second comparator
Input is connected, and the node between the tenth resistance and the 11st resistance is connected with the in-phase input end of first comparator, institute
The output end for stating first comparator is connected by the 12nd resistance with the control end of switching tube, the output end of second comparator
Be connected by the 13rd resistance with the control end of switching tube, the control end of the switching tube pass through the second electric capacity and switching tube
Two ends are connected, and the second end of the switching tube is also directly grounded, and the first end of the switching tube passes through the 14th resistance and direct current
Power supply is connected, and the node between the first end of the switching tube and the 14th resistance is also connected with processor.
Further, the low cost human sense detection circuit of the use LM324 also includes the 3rd electric capacity, the 4th resistance
Node between the inverting input of the second operational amplifier passes through the 3rd capacity earth.
Further, the low cost human sense detection circuit of the use LM324 also includes the second electrochemical capacitor, the described 6th
Resistance is connected in parallel with the second electrochemical capacitor.
Further, the low cost human sense detection circuit of the use LM324 also includes the 4th electric capacity, the 4th electric capacity
It is connected with the 7th resistor coupled in parallel.
Further, the low cost human sense detection circuit of the use LM324 also includes the 5th electric capacity, the dc source
Also directly pass through the 5th capacity earth.
Further, the low cost human sense detection circuit of the use LM324 also includes the 3rd electrochemical capacitor, the described 3rd
Electrochemical capacitor is connected in parallel with the 5th electric capacity.
Wherein, the switching tube is triode, and the base stage of the triode is used as the control end of switching tube, the triode
Colelctor electrode as switching tube first end, the emitter stage of the triode as switching tube the second end.
The utility model is realized by following technical measures：By two fortune of the first operational amplifier and the second operational amplifier
Composition two-stage calculation amplifier is put, the faint people sense detection signal detected by the pyroelectric infrared sensor is put
Greatly, the first comparator and the second comparator constitute the window voltage comparator of about the two two-way amplitude discriminations of threshold, to by the
Two operational amplifiers output end output people sense signal intensity be identified and judge, when someone close to when, it is described second fortune
The signal for calculating the output end output of amplifier reaches sufficiently large, the output of the output end of the first comparator or the second comparator
End can export a high level, drive the signal being made up of the 12nd resistance, the 13rd resistance, switching tube and the 14th resistance
Output stage is turned on so that the input of switching tube exports low level and gives back-end processor interpretation；As nobody, described second
The signal of the output end output of operational amplifier is only less environmental noise level, it is impossible to which drive signal output stage is turned on,
Now the first end of the switching tube exports high level and gives back-end processor interpretation.Utilize the first of back-end processor switch tube
The exported low and high level interpretation in end is that can detect to have no one close, so as to control the Push And Release of related load, is realized automatic
Change control function.Load can be closed when due to nobody, thus energy-conservation purpose can be reached.
Brief description of the drawings
, below will be to embodiment in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art
Or the accompanying drawing used required in description of the prior art is briefly described, it should be apparent that, drawings in the following description are only
It is some embodiments of the present utility model, for those of ordinary skill in the art, is not paying the premise of creative work
Under, other accompanying drawings can also be obtained according to these accompanying drawings；
Fig. 1 is circuit diagram of the utility model using the better embodiment of LM324 low cost human sense detection circuit.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is carried out
Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the utility model, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made
The every other embodiment obtained, belongs to the scope of the utility model protection.
First, before embodiment is described, it is necessary to which some herein presented terms are explained.Example
Such as：
If occurring describing various elements using the term such as " first ", " second " herein, but these elements should not
Limited by these terms.These terms are only used for distinguishing an element and another element.Therefore, " first " element can also
It is referred to as " second " element without departing from teaching of the present utility model.
In addition, it is to be understood that when referring to an element " connection " or " coupled " to another element, it can be direct
Ground connects or is directly coupled to another element or can also have intermediary element.An element is referred on the contrary, working as " directly
When connection " or " directly coupling " arrive another element, then in the absence of intermediary element.
The various terms occurred herein are used only for describing the purpose of specific embodiment and being not intended as to this
The restriction of utility model.Unless context is clearly dictated otherwise, then singulative is intended to also include plural form.
When using term " comprising " and/or " including " in this manual, these terms specify the feature, whole
Body, step, operation, the presence of element and/or part, but be also not excluded for more than one other feature, entirety, step, operation,
Element, part and/or the presence of its group and/or additional.
On embodiment：
Fig. 1 is referred to, Fig. 1 is that a kind of use LM324 of the utility model low cost human sense detects the preferable implementation of circuit
The circuit diagram of mode.The better embodiment of the low cost human sense detection circuit of the use LM324 includes operational amplifier U1-
A and U1-B, comparator U1-C and U1-D, triode Q1.
Pyroelectric infrared sensor PIR power pins d is connected with dc source VDD, signal pins s and operational amplifier
U1-A in-phase input end is connected, grounding pin g ground connection.The in-phase input end of the operational amplifier U1-A also passes through resistance R1
Ground connection, the resistance R1 and electric capacity C1 is connected in parallel.
The inverting input of the operational amplifier U1-A is connected by resistance R2 with operational amplifier U1-A output end,
The resistance R2 and electric capacity C2 is connected in parallel.Node between the inverting input and resistance R2 of the operational amplifier U1-A according to
It is secondary to be grounded by resistance R3 and electrochemical capacitor EC1.
The output end of the operational amplifier U1-A also passes sequentially through electric capacity C3 and resistance R4 and operational amplifier U1-B's
Inverting input is connected, and the node between the inverting input of the resistance R4 and operational amplifier U1-B is connect by electric capacity C4
Ground.The in-phase input end of the operational amplifier U1-B is connected by resistance R13 with dc source VDD, the resistance R13 and fortune
The node calculated between amplifier U1-B in-phase input end is grounded by resistance R14, and the resistance R14 and electrochemical capacitor EC2 is simultaneously
Connection connection.The inverting input of the operational amplifier U1-B also directly passes through electric capacity C5 and operational amplifier U1-B output end
It is connected, the electric capacity C5 and resistance R5 is connected in parallel.
The output end of the operational amplifier U1-B and the same phase of comparator U1-C inverting input and comparator U1-D
Input is connected, and the dc source VDD is passed sequentially through and is grounded after resistance R6, R7, R8 and R9, between the resistance R6 and R7
Node is connected with comparator U1-D inverting input, and the node between the resistance R8 and R9 is same mutually defeated with comparator U1-C's
Enter end to be connected.
The output end of the operational amplifier U1-D is connected by resistance R10 with triode Q1 base stage, and the computing is put
Big device U1-C output end is connected by resistance R11 with triode Q1 base stage, and the base stage of the triode Q1 passes through electric capacity C6
It is connected with triode Q1 emitter stage, the emitter stage of the triode Q1 is also directly grounded, the colelctor electrode of the triode Q1 leads to
Cross resistance R12 with dc source VDD to be connected, the dc source VDD is also directly grounded by electric capacity C7, the electric capacity C7 and electricity
Solution electric capacity EC3 is connected in parallel.Node between the colelctor electrode of the triode Q1 and resistance R12 is also connected with processor MCU.
It will detect that the operation principle of circuit is simply described to above-mentioned use LM324 low cost human sense below：
The operational amplifier U1-A and U1-B constitute two-stage calculation amplifier, for that will come from pyroelectric infrared sensor
PIR faint people sense signal zooms into the sufficiently large AC signal of amplitude for rear class window comparator (i.e. comparator U1-C and U1-
D) it is compared.Because people's sense signal is a kind of slow AC signal, so the pre- discharge circuit of the first order (including operation amplifier
Device U1-A, resistance R2 and R3) using the in-phase amplifier circuit framework of AC signal, its multiplication factor=1+r2/r3 (wherein r2
And r3 represents resistance R2 and R3 resistance respectively), then through electric capacity C3 couple after to the anti-phase operational amplification circuit in the second level (including
Operational amplifier U1-B, resistance R4 and R5) second of amplification is carried out again, its multiplication factor=r5/r4 (wherein r4 and r5 difference tables
Show resistance R4 and R5 resistance), while the DC potential that the output end of the operational amplifier U1-B is exported is elevated, it is lifted
High potential reference point=vdd × r13/r14, wherein vdd represent dc source VDD magnitude of voltage, and r13 and r14 are represented respectively
Resistance R13 and R14 resistance, to be shaken above and below being carried out for the window voltage comparator (including comparator U1-C, U1-D) of rear end
The two-way amplitude discrimination of width.
In the utility model, if the signal potential that the output end for not raising the operational amplifier U1-B is exported, it will
Because nobody when ambient noise signal voltage waveform trough be likely lower than set by rear end comparator U1-C in-phase input end
Reference level and cause triode Q1 to turn on and then be mistaken for someone.
The in-phase input end of the comparator U1-C and comparator U1-D inverting input set window voltage and compared
The reference level value of threshold up and down of device, wherein reference level value=vdd × r9/ of the in-phase input end of the comparator U1-C
(r6+r7+r8+r9), reference level value=vdd × (r7+r8+r9)/(r6+r7+ of the inverting input of the comparator U1-D
R8+r9), wherein r6, r7, r8 and r9 represent resistance R6, R7, R8 and R9 resistance respectively.
It is described when pyroelectric infrared sensor PIR people's sense signal is after the amplification of operational amplifier U1-A, U1-B two-stage
People's sense signal amplitude that operational amplifier U1-B output end is exported is more than the benchmark electricity of comparator U1-D inverting input
During level values, the output end output high level of the comparator U1-D, now by the output end institute of the operational amplifier U1-B
People's sense signal amplitude of output is more than the reference level value of comparator U1-C in-phase input end, the output of the comparator U1-C
End output low level, the high level of the output end output of the comparator U1-D drives triode after resistance R10, R11 partial pressure
Q1 is turned on, and the colelctor electrode of the triode Q1 exports low level and detected to back-end processor MCU.
People's sense signal amplitude of the output end output of the operational amplifier U1-B is less than comparator U1-C homophase input
During the reference level value at end, the output end of comparator U1-C output high level is now defeated due to operational amplifier U1-B
The people for going out end output feels signal amplitude again smaller than the reference level of the inverting input of the comparator U1-D, the comparator
U1-D output end output low level, the high level of the output end output of the comparator U1-C is after resistance R11, R10 partial pressure
Triode Q1 conductings are driven, the colelctor electrode of the triode Q1 also exports low level and detected to back-end processor MCU.
When people's sense signal amplitude that operational amplifier U1-B output end is exported is weaker, in the same mutually defeated of comparator U1-C
When entering between the reference level set by end and the reference level set by comparator U1-D inverting input, because computing is put
The signal of big device U1-B output end is more than the reference level of comparator U1-C in-phase input end, and the comparator U1-C's is defeated
Go out end output low level；Now the signal of operational amplifier U1-B output end is less than the base of comparator U1-D inverting input
Quasi- level, the output end of the operational amplifier U1-D also exports low level, thus the triode Q1 is cut off, three pole
Pipe Q1 colelctor electrode exports high level and detected to back-end processor MCU, is used as the identification signal of nobody.
From the foregoing, it will be observed that r6, (r7+r8), r9 setting, it is necessary to operational amplifier U1-B output when making nobody feel signal
The exported noise signal amplitude in end is in set by comparator U1-C in-phase input end and comparator U1-D inverting input
Between the reference level threshold value put, it can so ensure that triode Q1 pipes are in cut-off state when nobody feels signal, this
When its colelctor electrode output high level, the low level exported during with someone forms completely different contrast, so just will not be by nothing
Environment noise signal during people disturbs and produces erroneous judgement.And when someone feels signal, should make the operational amplifier U1-B's defeated
Go out the in-phase input end or anti-phase more than the comparator U1-D that the exported amplified signal amplitude in end is less than comparator U1-C
Reference level threshold value set by input, can so allow triode Q1 to turn on, export the colelctor electrode of the triode Q1
Low level is detected to back-end processor MCU, is used as the identification signal of someone.
In present embodiment, described resistance R6, R7, R8, R9 recommend selection resistance to cause comparator U1-C's same mutually defeated
The reference level for entering end is approximately equal to (0.3~0.4) × (vdd-1.2V), the benchmark electricity of the inverting input of the comparator U1-D
It is flat to be approximately equal to (0.7~0.6) × (vdd-1.2V).
In present embodiment, described resistance R7, R8 are used for fine tuning dividing ratios, can be appropriate to adjust according to actual conditions
Section r6, (r7+r8), r9 ratio reach optimal people to adjust the two-way amplitude discrimination threshold value up and down set by window comparator
Feel detection sensitivity effect.
Meanwhile, in other embodiment, the triode Q1 also can be other switching tubes, and its control end is equivalent to triode
Q1 base stage, first end and the second end are respectively equivalent to triode Q1 colelctor electrode and source electrode, when the control end of the switching tube
When receiving high level signal, its first end and the second termination are logical, when the control end of the switching tube receives low level signal
When, its first end disconnects with the second end.
On the basis of previous technique scheme, the supply voltage of the dc source VDD is by pyroelectric infrared sensor
PIR operating voltage limitation, generally takes in the range of 3V~5.5V, in case the pyroelectric infrared sensor PIR is damaged.It is described
Electrochemical capacitor EC3 is filter capacitor, and 47uF~100uF/16V, triode Q1 can be selected to select the models such as 9014,8050
NPN triode.
Embodiment of the present utility model is these are only, the scope of the claims of the present utility model, every profit is not thereby limited
The equivalent structure or equivalent flow conversion made with the utility model specification and accompanying drawing content, or directly or indirectly it is used in it
The technical field of his correlation, is similarly included in scope of patent protection of the present utility model.
Claims (7)
1. the low cost human sense detection circuit of use LM324 a kind of, for being connected with pyroelectric infrared sensor, its feature exists
In：People's sense detection circuit includes first and second operational amplifier, first and second comparator, switching tube, and the heat is released
The signal pins of electric infrared sensor are connected with the in-phase input end of the first operational amplifier, first operational amplifier it is same
Phase input is also grounded by first resistor, and the inverting input of first operational amplifier passes through second resistance and the first fortune
The output end for calculating amplifier is connected, and node between the inverting input and second resistance of first operational amplifier passes through the
Three resistance are grounded after being connected with the first electrochemical capacitor, the output end of first operational amplifier also pass sequentially through the first electric capacity and
4th resistance is connected with the inverting input of the second operational amplifier, and the in-phase input end of second operational amplifier passes through
Five resistance are connected with dc source, and the node between the in-phase input end of the 5th resistance and the second operational amplifier passes through
Six resistance eutral groundings, the inverting input of second operational amplifier also directly passes through the 7th resistance and the second operational amplifier
Output end is connected, the output end of second operational amplifier and the inverting input of first comparator and the second comparator it is same
Phase input is connected, and the dc source passes sequentially through the 8th resistance, the 9th resistance, the tenth resistance and the 11st resistance and is followed by
Ground, the node between the 8th resistance and the 9th resistance is connected with the inverting input of the second comparator, the tenth resistance
Node between the 11st resistance is connected with the in-phase input end of first comparator, and the output end of the first comparator passes through
12nd resistance is connected with the control end of switching tube, and the output end of second comparator passes through the 13rd resistance and switching tube
Control end is connected, and the control end of the switching tube is connected by the second electric capacity with the second end of switching tube, and the of the switching tube
Two ends are also directly grounded, and the first end of the switching tube is connected by the 14th resistance with dc source, and the of the switching tube
Node between one end and the 14th resistance is also connected with processor.
2. as claimed in claim 1 using LM324 low cost human sense detection circuit, it is characterised in that：People's sense detection
The node that circuit is also included between the 3rd electric capacity, the inverting input of the 4th resistance and the second operational amplifier passes through the 3rd
Capacity earth.
3. as claimed in claim 1 using LM324 low cost human sense detection circuit, it is characterised in that：People's sense detection
Circuit also includes the second electrochemical capacitor, and the 6th resistance is connected in parallel with the second electrochemical capacitor.
4. as claimed in claim 1 using LM324 low cost human sense detection circuit, it is characterised in that：People's sense detection
Circuit also includes the 4th electric capacity, and the 4th electric capacity is connected with the 7th resistor coupled in parallel.
5. as claimed in claim 1 using LM324 low cost human sense detection circuit, it is characterised in that：People's sense detection
Circuit also includes the 5th electric capacity, and the dc source also directly passes through the 5th capacity earth.
6. as claimed in claim 5 using LM324 low cost human sense detection circuit, it is characterised in that：People's sense detection
Circuit also includes the 3rd electrochemical capacitor, and the 3rd electrochemical capacitor is connected in parallel with the 5th electric capacity.
7. as claimed in claim 1 using LM324 low cost human sense detection circuit, it is characterised in that：The switching tube is
Triode, the base stage of the triode is as the control end of switching tube, and the colelctor electrode of the triode is used as the first of switching tube
End, the emitter stage of the triode as switching tube the second end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621480858.3U CN206432970U (en) | 2016-12-30 | 2016-12-30 | Circuit is detected using LM324 low cost human sense |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621480858.3U CN206432970U (en) | 2016-12-30 | 2016-12-30 | Circuit is detected using LM324 low cost human sense |
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| Publication Number | Publication Date |
|---|---|
| CN206432970U true CN206432970U (en) | 2017-08-22 |
Family
ID=59585659
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| CN201621480858.3U Active CN206432970U (en) | 2016-12-30 | 2016-12-30 | Circuit is detected using LM324 low cost human sense |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108469551A (en) * | 2018-05-25 | 2018-08-31 | 河北工业大学 | A kind of multichannel small capacitance signal acquisition processing circuit |
| CN111629470A (en) * | 2020-06-18 | 2020-09-04 | 福建省中科生物股份有限公司 | Load power supply method and system for guaranteeing safe operation |
| CN111953325A (en) * | 2020-08-16 | 2020-11-17 | 西安电子科技大学 | Audio signal detection circuit using window comparator |
-
2016
- 2016-12-30 CN CN201621480858.3U patent/CN206432970U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108469551A (en) * | 2018-05-25 | 2018-08-31 | 河北工业大学 | A kind of multichannel small capacitance signal acquisition processing circuit |
| CN108469551B (en) * | 2018-05-25 | 2023-08-01 | 河北工业大学 | Multipath tiny capacitance signal acquisition processing circuit |
| CN111629470A (en) * | 2020-06-18 | 2020-09-04 | 福建省中科生物股份有限公司 | Load power supply method and system for guaranteeing safe operation |
| CN111629470B (en) * | 2020-06-18 | 2024-02-27 | 福建省中科生物股份有限公司 | Load power supply method and system for guaranteeing safe operation |
| CN111953325A (en) * | 2020-08-16 | 2020-11-17 | 西安电子科技大学 | Audio signal detection circuit using window comparator |
| CN111953325B (en) * | 2020-08-16 | 2022-03-18 | 西安电子科技大学 | Audio signal detection circuit using window comparator |
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