CN207399149U - A kind of infrared inductor amplifying circuit - Google Patents
A kind of infrared inductor amplifying circuit Download PDFInfo
- Publication number
- CN207399149U CN207399149U CN201721425655.9U CN201721425655U CN207399149U CN 207399149 U CN207399149 U CN 207399149U CN 201721425655 U CN201721425655 U CN 201721425655U CN 207399149 U CN207399149 U CN 207399149U
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- CN
- China
- Prior art keywords
- operational amplifier
- resistance
- infrared inductor
- amplifying circuit
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
The utility model discloses a kind of infrared inductor amplifying circuits, wherein, the positive input of first operational amplifier connects the output pin of infrared inductor by a first resistor, and the reverse input end of the first operational amplifier connects the output terminal of the first operational amplifier by a second resistance；The output terminal of first operational amplifier connects the reverse input end of second operational amplifier by one second capacitance of series connection and one the 4th resistance, the reverse input end of second operational amplifier connects the output terminal of second operational amplifier by one the 5th resistance, the positive input of second operational amplifier connects the divider node of a bleeder circuit by one the 6th resistance, and bleeder circuit is connected between a power supply and ground；The utility model obtains following advantageous effect：Amplifying circuit is exported using intermediate level as the sinusoidal wave signal of axis, so that the micro-control unit of rear end can accurately identify the signal of amplifying circuit output, reduces the possibility of the false triggering caused by external disturbance.
Description
Technical field
The utility model is related to electronic circuit technology field more particularly to a kind of amplification electricity applied to infrared inductor
Road.
Background technology
PIR (the passive infrared sensings of PassiveInfrared) is widely used in the technical fields such as security protection, sensing
In.But the situation of false triggering is frequently present of in using PIR as the product of infrared acquisition, existing PIR sensor circuits are adopted
With general PIR induction chips, general PIR chips have generally been internally integrated amplifier module and MCU
(MicrocontrollerUnit, micro-control unit).Its amplifier module is generally only to carry out the signal of pir sensor simply
Amplification, makes MCU easily be subject to external disturbance when detecting signal and forms false triggering, cause the performance existing defects of product.
Utility model content
For the above-mentioned problems in the prior art, a kind of the red of false triggering of reduction because of external disturbance formation is now provided
Outside line inductor amplifying circuit.
To achieve the above object, the utility model employs following technical solution：
A kind of infrared inductor amplifying circuit, wherein, including a current supply circuit, to connect the confession of infrared inductor
Electric pin, an earthed circuit, to connect the grounding pin of the infrared inductor, an amplifying circuit connects the infrared ray
The output pin of inductor；
The amplifying circuit includes one first operational amplifier and a second operational amplifier, first operational amplifier
Positive input the output pin of the infrared inductor is connected by a first resistor, first operational amplifier
Reverse input end connects the output terminal of first operational amplifier by a second resistance, first operational amplifier it is anti-
Also pass through the 3rd resistor and one first capacity earth of series connection to input terminal；
The output terminal of first operational amplifier connects described the by one second capacitance of series connection and one the 4th resistance
The reverse input end of two operational amplifiers, the reverse input end of the second operational amplifier pass through described in the connection of one the 5th resistance
The output terminal of second operational amplifier, the positive input of the second operational amplifier pass through one the 6th resistance connection, one partial pressure
The divider node of circuit, the bleeder circuit are connected between a power supply and ground；
Output terminal one output resistance of series connection of the second operational amplifier forms the output terminal of the amplifying circuit.
The positive power supply of the another aspect of the utility model, first operational amplifier and the second operational amplifier
Input terminal connects the reverse electrical source input termination of the power supply, first operational amplifier and the second operational amplifier
Ground.
The positive power supply of the another aspect of the utility model, first operational amplifier and the second operational amplifier
Input terminal also passes through a pair of 3rd capacitance and the 4th capacity earth parallel with one another.
The another aspect of the utility model, the second resistance both ends are parallel with one the 5th capacitance.
The another aspect of the utility model, the 5th resistance both ends are parallel with one the 6th capacitance.
The another aspect of the utility model, the output pin of the infrared inductor by one the 7th resistance eutral grounding, with
And the output pin of the infrared inductor passes through one the 7th capacity earth.
The another aspect of the utility model, the divider node pass through one the 8th capacity earth.
The another aspect of the utility model, bleeder circuit are resistor voltage divider circuit, and the resistor voltage divider circuit includes mutual
The first divider resistance and the second divider resistance of series connection, the divider node are formed at first divider resistance and described second
At the tie point of divider resistance.
The another aspect of the utility model, the first operational amplifier are formed at same chip with the described second remote amplifier of calculating
In.
The utility model obtains following advantageous effect：
When infrared inductor noninductive induction signal, amplifying circuit exports an intermediate level, when infrared inductor is felt
Amplifying circuit output is using intermediate level as the sinusoidal wave signal of axis during induction signal, so that the micro-control unit of rear end can be accurate
It identifies the signal of amplifying circuit output, reduces the possibility of the false triggering caused by external disturbance.
Description of the drawings
Fig. 1 is a kind of circuit diagram of infrared inductor amplifying circuit of the utility model.
Specific embodiment
The utility model is described in further detail in the following with reference to the drawings and specific embodiments, but not as the utility model
It limits.
The utility model provides a kind of infrared inductor amplifying circuit, as shown in Figure 1, wherein, including a current supply circuit
100, to connect energization pins PIR_P1, the earthed circuit GND of infrared inductor, to connect the infrared induction
The grounding pin PIR_GND of device, an amplifying circuit 200 connect the output pin PIR_P2 of the infrared inductor；
The amplifying circuit includes one first operational amplifier and a second operational amplifier, and what is provided in Fig. 1 is first
The embodiment that operational amplifier and a second operational amplifier are formed by same chip, as optional embodiment, the chip
Signal is SGM8042, it is pointed out that the chip signal is only applicable to illustrate, those skilled in the art will envision that with other
The multioperation amplifier chip of model, the operational amplifiers of even two individual packages realize the first operational amplifier and
Two operational amplifiers, therefore cannot the scope of protection of the utility model be limited with said chip and its model.Above-mentioned SGM8042
Operational amplifier there are two tools in chip, wherein, pin 1 (is put for the output terminal of the first operational amplifier with the first computing below
The output terminal 1 of big device represents), pin 2 is the reverse input end of the first operational amplifier (below with the anti-of the first operational amplifier
Represented to input terminal 2), pin 3 is (defeated with the forward direction of the first operational amplifier below for the positive input of the first operational amplifier
Enter end 3 to represent), pin 7 is the output terminal (being represented below with the output terminal 7 of second operational amplifier) of second operational amplifier,
Pin 6 be second operational amplifier reverse input end (being represented below with the reverse input end 6 of second operational amplifier), pin
5 be the positive input (being represented below with the positive input 5 of second operational amplifier) of second operational amplifier, and pin 8 is
First operational amplifier and the positive power input of second operational amplifier are (below with the first operational amplifier and the second computing
The positive power input 8 of amplifier represents), pin 4 is the first operational amplifier and the reverse electrical source of second operational amplifier
Input terminal (is represented) with the reverse electrical source input terminal 4 of the first operational amplifier and second operational amplifier below.
The positive input 3 of first operational amplifier passes through a first resistor R21 connections infrared inductor
Output pin PIR_P2, the reverse input end 2 of first operational amplifier passes through a second resistance R20 connections described first
The output terminal 1 of operational amplifier, the reverse input end 2 of first operational amplifier also by the 3rd resistor R18 of series connection and
One first capacitance C11 is grounded；
One second capacitance C13 and one fourth resistance R19 connection of the output terminal 1 of first operational amplifier by series connection
The reverse input end 6 of the second operational amplifier, the reverse input end 6 of the second operational amplifier pass through one the 5th resistance
The output terminal 7 of the R22 connections second operational amplifier, the positive input 5 of the second operational amplifier pass through one the 6th
The divider node of one bleeder circuit of resistance R23 connections, the bleeder circuit are connected between a power supply VCC and ground；
The one output resistance R27 of the series connection of output terminal 7 of the second operational amplifier forms the output terminal of the amplifying circuit.
The positive power supply of the another aspect of the utility model, first operational amplifier and the second operational amplifier
Input terminal 8 connects the reverse electrical source input terminal of the power supply VCC, first operational amplifier and the second operational amplifier
4 ground connection.
The positive power supply of the another aspect of the utility model, first operational amplifier and the second operational amplifier
Input terminal 8 is also grounded by a pair of 3rd capacitance C9 parallel with one another and the 4th capacitance C10.
The another aspect of the utility model, the second resistance R20 both ends are parallel with one the 5th capacitance C12.
The another aspect of the utility model, the 5th resistance R22 both ends are parallel with one the 6th capacitance C15.
The another aspect of the utility model, the output pin PIR_P2 of the infrared inductor pass through one the 7th resistance
R27 is grounded and the output pin PIR_P2 of the infrared inductor is grounded by one the 7th capacitance C16.
The another aspect of the utility model, the divider node are grounded by one the 8th capacitance C17.
The another aspect of the utility model, the bleeder circuit are resistor voltage divider circuit, and the resistor voltage divider circuit includes
The the first divider resistance R25 and the second divider resistance R26, the divider node being serially connected are formed at first divider resistance
At the tie point of R25 and the second divider resistance R26.
The foregoing is merely the utility model preferred embodiment, not thereby limit the utility model embodiment and
Protection domain to those skilled in the art, should can appreciate that all in the utility model specification and diagram
Hold made equivalent substitution and obviously change obtained scheme, the protection model of the utility model should all be included in
In enclosing.
Claims (9)
1. a kind of infrared inductor amplifying circuit, which is characterized in that including a current supply circuit, to connect infrared inductor
Energization pins, an earthed circuit, to connect the grounding pin of the infrared inductor, amplifying circuit connection is described red
The output pin of outside line inductor；
The amplifying circuit includes one first operational amplifier and a second operational amplifier, and first operational amplifier is just
Connect the output pin of the infrared inductor by a first resistor to input terminal, first operational amplifier it is reversed
Input terminal connects the output terminal of first operational amplifier by a second resistance, first operational amplifier it is reversed defeated
Enter end and also pass through the 3rd resistor and one first capacity earth of series connection；
The output terminal of first operational amplifier connects second fortune by one second capacitance of series connection and one the 4th resistance
The reverse input end of amplifier is calculated, the reverse input end of the second operational amplifier connects described second by one the 5th resistance
The output terminal of operational amplifier, the positive input of the second operational amplifier connect a bleeder circuit by one the 6th resistance
Divider node, the bleeder circuit is connected between a power supply and ground；
Output terminal one output resistance of series connection of the second operational amplifier forms the output terminal of the amplifying circuit.
2. infrared inductor amplifying circuit as described in claim 1, which is characterized in that first operational amplifier and described
The positive power input of second operational amplifier connects the power supply, and first operational amplifier and second computing are put
The reverse electrical source input end grounding of big device.
3. infrared inductor amplifying circuit as claimed in claim 2, which is characterized in that first operational amplifier and described
The positive power input of second operational amplifier also passes through a pair of 3rd capacitance and the 4th capacity earth parallel with one another.
4. infrared inductor amplifying circuit as described in claim 1, which is characterized in that the second resistance both ends are parallel with one
5th capacitance.
5. infrared inductor amplifying circuit as described in claim 1, which is characterized in that the 5th resistance both ends are parallel with one
6th capacitance.
6. infrared inductor amplifying circuit as described in claim 1, which is characterized in that the output of the infrared inductor is drawn
Foot passes through one the 7th capacity earth by the output pin of one the 7th resistance eutral grounding and the infrared inductor.
7. infrared inductor amplifying circuit as described in claim 1, which is characterized in that the divider node passes through one the 8th electricity
Hold ground connection.
8. infrared inductor amplifying circuit as described in claim 1, which is characterized in that the bleeder circuit is electric resistance partial pressure electricity
Road, the resistor voltage divider circuit include the first divider resistance and the second divider resistance that are serially connected, and the divider node is formed
At the tie point of first divider resistance and second divider resistance.
9. infrared inductor amplifying circuit as described in claim 1, which is characterized in that the first operational amplifier and described second
Operational amplifier is formed in same chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721425655.9U CN207399149U (en) | 2017-10-31 | 2017-10-31 | A kind of infrared inductor amplifying circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721425655.9U CN207399149U (en) | 2017-10-31 | 2017-10-31 | A kind of infrared inductor amplifying circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207399149U true CN207399149U (en) | 2018-05-22 |
Family
ID=62327525
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721425655.9U Expired - Fee Related CN207399149U (en) | 2017-10-31 | 2017-10-31 | A kind of infrared inductor amplifying circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207399149U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110080892A (en) * | 2019-05-21 | 2019-08-02 | 车行天下网络科技股份有限公司 | Automobile control method based on boost pressure signal |
-
2017
- 2017-10-31 CN CN201721425655.9U patent/CN207399149U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110080892A (en) * | 2019-05-21 | 2019-08-02 | 车行天下网络科技股份有限公司 | Automobile control method based on boost pressure signal |
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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: 20180522 Termination date: 20191031 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |