CN207557085U - A kind of detection circuit based on photometry - Google Patents
A kind of detection circuit based on photometry Download PDFInfo
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- CN207557085U CN207557085U CN201721554455.3U CN201721554455U CN207557085U CN 207557085 U CN207557085 U CN 207557085U CN 201721554455 U CN201721554455 U CN 201721554455U CN 207557085 U CN207557085 U CN 207557085U
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Abstract
The utility model discloses a kind of detection circuit based on photometry, which includes：PWM constant current switch circuits connect power supply and LED light source, constant current are provided for LED light source；Sample circuit is connect with photocell, and the current signal for being exported to the photocell samples；Microcontroller, it is connected to the PWM constant current switches circuit by a D/A converting circuit, constant current controls signal so that the constant current of the PWM constant current switches circuit to be controlled to export, and export PWM wave to control the break-make of the PWM constant current switches circuit all the way for output；Microcontroller is also connected to the sample circuit by an analog to digital conversion circuit, obtains the current signal of sampling circuit samples, carries out difference operation processing to the numerical value at current signal PWM wave high level and low level, obtains test data.It drifts about caused by when the utility model avoids the influence because using the light source of single intensity by sunlight, improves test data accuracy.
Description
Technical field
The utility model is related to environment monitoring equipment technical field more particularly to a kind of detection circuits based on photometry.
Background technology
The online water quality serial analysis instrument of many environment-friendly products all uses colorimetric method as detection method at present, different
The LED of specific wavelength is used then to be received as light source in receiving terminal using selenium cell or silicon photocell in detecting factor
After carry out amplification detection.In current circuit design, due to not accounting for the influence of sunlight on daytime and the influence of temperature, make
It is the light source of single intensity, can causes strong influence to photometry test data in this way, causes test data can be with
Sunrise sunset generates greatly drift.
Utility model content
The technical problem to be solved by the utility model is to propose that one kind can eliminate sunlight to test number to photometry
According to influence the detection circuit based on photometry.
In order to solve the above technical problems, the utility model uses following technical scheme：
A kind of detection circuit based on photometry, the detection circuit include：PWM constant current switch circuits, connection power supply and
LED light source provides constant current for LED light source；
Sample circuit is connect with photocell, and the current signal for being exported to the photocell samples；
Microcontroller, the PWM constant current switches circuit is connected to by a D/A converting circuit, and output is constant all the way
Current controling signal exports PWM wave to control the PWM so that the constant current of the PWM constant current switches circuit to be controlled to export
The break-make of constant current switch circuit；Microcontroller is also connected to the sample circuit by an analog to digital conversion circuit, obtains sampling electricity
The current signal of the sampling on road carries out difference operation processing to the numerical value at current signal PWM wave high level and low level, obtains
Test data.
Wherein, the input terminal of the SPI interface of the microcontroller and output interface connection D/A converting circuit, microcontroller
The input terminal of the PWM wave output terminal connection PWM constant current switch circuit PWM waves of device, the input terminal connection sampling electricity of microcontroller
The output terminal on road is to obtain the numerical value at the current signal PWM wave high level and low level of sampling circuit samples.
Wherein, the PWM constant current switches circuit includes a constant current output circuit and an analog switch K1；It is described constant
The output terminal of the input terminal connection D/A converting circuit of current output circuit；The enabled pin connection micro-control of the analog switch K1
The PWM wave output terminal of device processed, the cathode of the input/output pin connection LED light source of analog switch K1, analog switch K1's is another
One input/output pin connects the constant current output terminal of constant current output circuit, the anode connection direct current of LED light source
Source.
Wherein, the constant current output circuit includes operational amplifier U2 and triode Q1, the operational amplifier
The in-phase input end of U2 is passed through by the output terminal of the resistance R6 connections D/A converting circuit, the output terminal of operational amplifier U2
The base stage of resistance R7 connecting triodes Q1, the emitter of the inverting input connecting triode Q1 of operational amplifier U2, triode
The emitter of Q1 is grounded by resistance R8, and the collector of triode Q1 connects another input/output pin, digital-to-analogue conversion electricity
The output terminal on road is grounded by resistance R5.
Wherein, the model 74LVC1G66 of the analog switch K1.
Wherein, the sample circuit includes an operational amplifier U4, and the in-phase input end of operational amplifier U4 passes through electricity
The anode of R11 connection photocells U3 is hindered, the inverting input of operational amplifier U4 passes sequentially through swept resistance R12 and resistance R13
The output terminal of operational amplifier U4 is connected, the inverting input of operational amplifier U4 is also grounded by resistance R9, operational amplifier
The output terminal of U4 is also grounded by resistance R14 connection analog to digital conversion circuits, the output terminal of operational amplifier U4 by resistance R15,
One end of resistance R11 connection photocell U3 anodes is grounded by resistance R10.
Wherein, the photocell U3 is selenium cell or silicon photocell.
Wherein, the D/A converting circuit includes an analog-digital chip U1, pull-up resistor R1~R4, the digital-to-analogue conversion
The model MCP4802 of chip U1；One end of the SDI pins connection pull-up resistor R1 of analog-digital chip U1 and microcontroller
One SPI interface, one end of SCK pins connection pull-up resistor R2 of analog-digital chip U1 and another SPI interface of microcontroller,
One output interface of the LDAC pins of analog-digital chip U1 and one end of pull-up resistor R3, the CS pins of analog-digital chip U1
An output interface of microcontroller and one end of pull-up resistor R4 are connected, the VoutA pins of analog-digital chip U1 are connected as counting
One end of the output terminal connection resistance R5 of analog conversion circuit, the VSS pins ground connection of analog-digital chip U1, analog-digital chip U1
VDD pins connection DC power supply, the other end of pull-up resistor R1, R2, R3 and R4 is all connected with DC power supply.
Compared with prior art, the beneficial effects of the utility model are：The utility model controls PWM constant currents using PWM wave
The break-make of switching circuit so as to control the light on and off of LED light source, makes LED light source shine by the low and high level of PWM wave, sample circuit
The current signal of photocell output is obtained, the numerical value at high level and low level to current signal samples respectively, micro-control
Device processed obtains the numerical value of sampling circuit samples by analog to digital conversion circuit, and difference operation is carried out to the numerical value, obtains test number
According to this avoid drifts caused by when using the influence by sunlight of the light source of single intensity, improve test data
Accuracy.
Description of the drawings
Fig. 1 is a kind of structure diagram for detection circuit based on photometry that the utility model specific embodiment provides.
Fig. 2 is a kind of circuit diagram for D/A converting circuit that the utility model specific embodiment provides.
Fig. 3 is a kind of circuit diagram for PWM constant current switches circuit that the utility model specific embodiment provides.
Fig. 4 is a kind of sample circuit, analog to digital conversion circuit and the microcontroller that the utility model specific embodiment provides
Circuit diagram.
Specific embodiment
The technical issues of to solve the utility model, the technical solution used and the technique effect reached are clearer,
The technical solution of the utility model embodiment is described in further detail below in conjunction with attached drawing, it is clear that described reality
It is only the utility model part of the embodiment to apply example, instead of all the embodiments.Based on the embodiment in the utility model,
It is new to belong to this practicality for those skilled in the art's all other embodiments obtained without creative efforts
The range of type protection.
The detection circuit based on photometry that 1~4 pair of the utility model embodiment provides below in conjunction with the accompanying drawings is made further
Detailed description.It please refers to Fig.1, is a kind of detection electricity based on photometry provided in specific embodiment of the present invention
The structure diagram on road, as shown in Figure 1, in some embodiments, being somebody's turn to do the detection circuit based on photometry and including：PWM constant currents
Switching circuit 400 connects power supply 300 and LED light source 500, and constant current is provided for LED light source 500；Sample circuit 200, with light
Battery 600 connects, and the current signal for being exported to the photocell 600 samples, when LED light source is lighted, photocell
600 receptions are LED light source and the optical signal of ambient light, and when LED light source extinguishes, what photocell 600 received is ambient light
Optical signal, the current signal that photocell 600 forms the optical signal conversion of reception, sample circuit 200 acquire photocell 600 and export
Current signal；Microcontroller 100 is connected to the PWM constant current switches circuit 400 by a D/A converting circuit, defeated
Go out constant current all the way and control signal so that the constant current of PWM constant current switches circuit 400 to be controlled to export, and export PWM wave to control
The break-make of the PWM constant current switches circuit 400 is made, so as to which the shinny of LED light source 500 be controlled to go out；Microcontroller 100 also passes through one
Analog to digital conversion circuit 700 is connected to the sample circuit 200, obtains the current signal of the sampling of sample circuit 200, and electric current is believed
Numerical value at number PWM wave high level and low level carries out difference operation processing, obtains test data.Microcontroller 100 exports PWM
Wave to PWM constant current switches circuit 400 to control the break-make of PWM constant current switches circuit 400, so as to control LED light source 500 by PWM
The low and high level of wave shines, when PWM wave be high level when LED light source 500 light, when PWM wave be low level when LED light source 500
Extinguish；Can certainly control make when PWM wave be low level when LED light source 500 light, when PWM wave be high level when LED light source
500 extinguish.
Detection circuit provided in this embodiment controls the break-make of PWM constant current switch circuits using PWM wave, so as to control LED
The light on and off of light source make LED light source shine by the low and high level of PWM wave, and sample circuit obtains the current signal of photocell output, right
Numerical value at the high level and low level of current signal is sampled respectively, and microcontroller is obtained by analog to digital conversion circuit and sampled
The numerical value of circuit sampling carries out difference operation to the numerical value, obtains test data, this avoid because using single intensity
Light source by sunlight influenced and caused by drift, improve test data accuracy.
Fig. 4 is a kind of sample circuit, analog to digital conversion circuit and the microcontroller that the utility model specific embodiment provides
Circuit diagram, as shown in figure 4, in some embodiments, the SPI interface of the microcontroller 100 and output interface connection digital-to-analogue
The input terminal of conversion circuit, the input of the output terminal connection PWM constant current switch circuit 400PWM waves of the PWM wave of microcontroller 100
End, the output terminal of the input terminal connection sample circuit 200 of microcontroller 100 are believed with obtaining the electric current of the acquisition of sample circuit 200
Numerical value at number PWM wave high level and low level.
Fig. 3 is a kind of circuit diagram for PWM constant current switches circuit that the utility model specific embodiment provides, as shown in Figure 3
In some embodiments, the PWM constant current switches circuit 400 further includes a constant current output circuit 401 and an analog switch
K1；The constant current output circuit 401 input terminal connection D/A converting circuit output terminal, with export constant current to
LED light source 500；The PWM wave output terminal of enabled pin (pin 4) the connection microcontroller 100 of the analog switch K1, simulation are opened
The cathode of an input/output pin (pin 1) the connection LED light source 500 of K1 is closed, another input/output of analog switch K1 is drawn
The constant current output terminal of foot (pin 2) connection constant current output circuit 401, the anode connection direct current of LED light source 500
Source.In some embodiments, the VCC pin (pin 5) of the model 74LVC1G66 of the analog switch K1, analog switch K1
Connect DC power supply, GND pin (pin 3) ground connection of analog switch.User can also select the mould of other models as needed
Intend switch K1, do not limit here.
As shown in figure 3, in some embodiments, constant current output circuit 301 has operational amplifier U2 and triode Q1,
The in-phase input end of the operational amplifier U2 passes through the output terminal of the resistance R6 connections D/A converting circuit, operational amplifier
The output terminal of U2 by the base stage of resistance R7 connecting triodes Q1, the inverting input connecting triode Q1's of operational amplifier U2
Emitter, the emitter of triode Q1 are grounded by resistance R8, and the collector of triode Q1 connects another input/output and draws
Foot, the output terminal of D/A converting circuit are grounded by resistance R5.Constant current output circuit 301 is defeated by D/A converting circuit 200
The signal gone out is converted into constant current and is exported by analog switch to LED light source 500, and constant current is provided for LED light source 500,
LED light source 500 is made to shine more stable.
As shown in figure 4, in some embodiments, sample circuit 200 includes an operational amplifier U4, operational amplifier U4
In-phase input end by resistance R11 connection photocells U3 (it should be noted that the reference numeral of photocell in fig. 1 is
600, reference numeral in figure 4 is U3, and either 600 or U3 representatives are all photocells) anode, operational amplifier
The inverting input of U4 passes sequentially through the output terminal that swept resistance R12 connects operational amplifier U4 with resistance R13, operational amplifier
The inverting input of U4 is also grounded by resistance R9, and the output terminal of operational amplifier U4 passes through resistance R14 connections analog-to-digital conversion electricity
Road, the output terminal of operational amplifier U4 are also grounded by resistance R15, and one end of resistance R11 connection photocell U3 anodes passes through electricity
Hinder R10 ground connection.The amplification factor of operational amplifier U4 is (R13+R12+R9)/R9.The current signal that R10 exports photocell U3
It is transformed into voltage signal；R15 is the load of operational amplifier U4 outputs, the output of operational amplifier U4 is made more to stablize, R14 is
The input impedance of increasing modulus conversion circuit 700.When LED light source is lighted, what photocell 600 received is LED light source and environment
The optical signal of light, when LED light source extinguishes, what photocell 600 received is the optical signal of ambient light, and photocell 600 is by reception
The current signal that optical signal conversion forms, current signal is changed by resistance R5 after voltage signal to be carried out by operational amplifier U4
Then voltage signal is changed digital signal by amplification by analog to digital conversion circuit 700 again, microcontroller 100 obtains analog-to-digital conversion electricity
Digital signal in road 700 simultaneously carries out calculus of differences and obtains test data, and calculus of differences eliminates ambient light (including sunlight)
Influence, so as to obtain more accurately test data, test data will not drift about.In some embodiments, modulus turns
It changes circuit 700 and includes a modulus conversion chip, voltage signal is converted by digital signal, sample circuit by modulus conversion chip
200 in sampling respectively to the corresponding numerical value of PWM wave high level (LED light source is lighted) and PWM wave low level (LED light source extinguishes,
Being influenced by ambient light) corresponding numerical value is acquired, and microcontroller 100 passes through modulus shifting circuit 700 and obtains sample circuit 200
The numerical value of sampling, corresponding with the low level numerical value of the corresponding numerical value of high level is carried out the difference operation sunlight that is eliminated influences
, without do not drift about, the higher test data of accuracy.Photocell U3 is selenium cell or silicon light in some embodiments
Battery etc..
Fig. 2 is a kind of circuit diagram for D/A converting circuit that the utility model specific embodiment provides, as shown in Fig. 2,
In some embodiments, D/A converting circuit includes an analog-digital chip U1, pull-up resistor R1~R4, the analog-digital chip
The model MCP4802 of U1；One end of SDI pins (pin 4) the connection pull-up resistor R1 of analog-digital chip U1 and microcontroller
One SPI interface of device 100, one end of SCK pins (pin 3) the connection pull-up resistor R2 of analog-digital chip U1 and microcontroller
100 another SPI interface, analog-digital chip U1'sOne output interface of pin (pin 5) and pull-up resistor R3's
One end, analog-digital chip U1'sOne output interface of pin (pin 2) connection microcontroller and the one of pull-up resistor R4
End, the output terminal that the VoutA pins (pin 8) of analog-digital chip U1 are connected as the analog voltage signal of D/A converting circuit connect
One end of connecting resistance R5, VSS pins (pin 7) ground connection of analog-digital chip U1, the VDD pins (pipe of analog-digital chip U1
Foot 1) DC power supply is connected, the other end of pull-up resistor R1, R2, R3 and R4 are all connected with DC power supply.
It should be noted that the DC power supply in the present embodiment corresponds to the VDD 5V in attached drawing, i.e. DC power supply is 5V
DC power supply.
The detection circuit that the utility model embodiment provides controls the break-make of PWM constant current switch circuits using PWM wave, so as to
The light on and off of LED light source are controlled, LED light source is made to shine by the low and high level of PWM wave, sample circuit obtains the electric current of photocell output
Signal, the numerical value at high level and low level to current signal sample respectively, and microcontroller passes through analog to digital conversion circuit
The numerical value of sampling circuit samples is obtained, difference operation is carried out to the numerical value, obtains test data, this avoid because using list
The light source of one intensity by sunlight influenced and caused by drift, improve test data accuracy.
The technical principle of the utility model is described above in association with specific embodiment.These descriptions are intended merely to explain this reality
With novel principle, and it cannot be construed to the limitation to scope of protection of the utility model in any way.Based on explanation herein,
Those skilled in the art would not require any inventive effort the other specific embodiments that can associate the utility model,
These modes are fallen within the scope of protection of the utility model.
Claims (8)
1. a kind of detection circuit based on photometry, which is characterized in that the detection circuit includes：
PWM constant current switch circuits connect power supply and LED light source, constant current are provided for LED light source；
Sample circuit is connect with photocell, and the current signal for being exported to the photocell samples；
Microcontroller is connected to the PWM constant current switches circuit by a D/A converting circuit, exports constant current all the way
Signal is controlled so that the constant current of the PWM constant current switches circuit to be controlled to export, and exports PWM wave to control the PWM constant currents
The break-make of switching circuit；Microcontroller is also connected to the sample circuit by an analog to digital conversion circuit, obtains sample circuit and adopts
The current signal of sample carries out difference operation processing to the numerical value at current signal PWM wave high level and low level, obtains test number
According to.
2. a kind of detection circuit based on photometry according to claim 1, which is characterized in that the microcontroller
The input terminal of SPI interface and output interface connection D/A converting circuit, the PWM wave output terminal connection PWM constant currents of microcontroller
The input terminal of switching circuit PWM wave, the output terminal of the input terminal connection sample circuit of microcontroller are adopted with obtaining sample circuit
Numerical value at the current signal PWM wave high level and low level of sample.
A kind of 3. detection circuit based on photometry according to claim 2, which is characterized in that the PWM constant current switches
Circuit includes a constant current output circuit and an analog switch K1；The input terminal connection digital-to-analogue of the constant current output circuit
The output terminal of conversion circuit；The PWM wave output terminal of the enabled pin connection microcontroller of the analog switch K1, analog switch K1
An input/output pin connection LED light source cathode, analog switch K1 another input/output pin connection constant current
The constant current output terminal of output circuit, the anode connection DC power supply of LED light source.
A kind of 4. detection circuit based on photometry according to claim 3, which is characterized in that the constant current output
Circuit includes operational amplifier U2 and the in-phase input end of triode Q1, the operational amplifier U2 pass through resistance R6 connections institute
The output terminal of D/A converting circuit is stated, the output terminal of operational amplifier U2 passes through the base stage of resistance R7 connecting triodes Q1, operation
The emitter of the inverting input connecting triode Q1 of amplifier U2, the emitter of triode Q1 are grounded by resistance R8, three poles
The collector of pipe Q1 connects another input/output pin, and the output terminal of D/A converting circuit is grounded by resistance R5.
5. a kind of detection circuit based on photometry according to claim 3, which is characterized in that the analog switch K1's
Model 74LVC1G66.
6. a kind of detection circuit based on photometry according to claim 1, which is characterized in that the sample circuit includes
There is an operational amplifier U4, the in-phase input end of operational amplifier U4 is put by the anode of resistance R11 connection photocells U3, operation
The inverting input of big device U4 passes sequentially through the output terminal that swept resistance R12 connects operational amplifier U4 with resistance R13, and operation is put
The inverting input of big device U4 is also grounded by resistance R9, and the output terminal of operational amplifier U4 is turned by resistance R14 connections modulus
Circuit is changed, the output terminal of operational amplifier U4 is also grounded by resistance R15, and one end of resistance R11 connection photocell U3 anodes leads to
Cross resistance R10 ground connection.
7. a kind of detection circuit based on photometry according to claim 1, which is characterized in that the photocell U3 is selenium
Photocell or silicon photocell.
A kind of 8. detection circuit based on photometry according to claim 2, which is characterized in that the D/A converting circuit
Including an analog-digital chip U1, pull-up resistor R1~R4, the model MCP4802 of the analog-digital chip U1；Digital-to-analogue turns
One end of SDI pins connection pull-up resistor R1 of chip U1 and a SPI interface of microcontroller are changed, analog-digital chip U1's
One end of SCK pins connection pull-up resistor R2 and another SPI interface of microcontroller, analog-digital chip U1'sPin
An output interface and pull-up resistor R3 one end, analog-digital chip U1'sOne output of pin connection microcontroller connects
One end of mouth and pull-up resistor R4, the VoutA pins of analog-digital chip U1 are connected as the output terminal connection of D/A converting circuit
One end of resistance R5, the VSS pins ground connection of analog-digital chip U1, the VDD pins connection DC power supply of analog-digital chip U1,
The other end of pull-up resistor R1, R2, R3 and R4 are all connected with DC power supply.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721554455.3U CN207557085U (en) | 2017-11-20 | 2017-11-20 | A kind of detection circuit based on photometry |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721554455.3U CN207557085U (en) | 2017-11-20 | 2017-11-20 | A kind of detection circuit based on photometry |
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| CN207557085U true CN207557085U (en) | 2018-06-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107677606A (en) * | 2017-11-20 | 2018-02-09 | 广东上风环保科技有限公司 | A kind of detection circuit based on photometry |
-
2017
- 2017-11-20 CN CN201721554455.3U patent/CN207557085U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107677606A (en) * | 2017-11-20 | 2018-02-09 | 广东上风环保科技有限公司 | A kind of detection circuit based on photometry |
| CN107677606B (en) * | 2017-11-20 | 2023-12-19 | 广东盈峰科技有限公司 | Detection circuit based on photometry |
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Address after: 528000 Leliu Street Office, Shunde District, Foshan City, Guangdong Province, Guangda Community Resident Committee, C11-2-2 Block, Leliu Intensive Industrial Development Zone, Daming Road Hardware Innovation Center 2034 (for office use only) Patentee after: Guangdong Yingfeng Technology Co., Ltd. Address before: 528000 Shunjiang Community Resident Committee, Beijiao Town, Shunde District, Foshan City, Guangdong Province Patentee before: Guangdong windward Environmental Protection Technology Co Ltd |