CN206442356U - A kind of low level light signal photoelectric switching circuit - Google Patents
A kind of low level light signal photoelectric switching circuit Download PDFInfo
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- CN206442356U CN206442356U CN201621289732.8U CN201621289732U CN206442356U CN 206442356 U CN206442356 U CN 206442356U CN 201621289732 U CN201621289732 U CN 201621289732U CN 206442356 U CN206442356 U CN 206442356U
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Abstract
The utility model is related to a kind of low level light signal photoelectric switching circuit, have the advantages that converted signals noise it is small, with it is wide, effectively suppression circuit can reflect, its structure includes：Electric current changes voltage and filtration module and filter and amplification module；The electric current conversion voltage and filtration module and the filter and amplification module are connected in series.The utility model can be converted into faint photo-signal voltage signal, and can filter reduction noise well by providing a kind of low level light signal photoelectric switching circuit；Further, the utility model solves the technical problem of circuit reflection by adding impedance matching in foregoing circuit, effectively；In addition, after using above-mentioned low level light signal photoelectric switching circuit, its amplifying circuit can possess 200M bandwidth, it can apply in various high-frequency circuit occasions.
Description
Technical field
The utility model is related to low level light signal change-over circuit technical field, and in particular to a kind of low level light signal opto-electronic conversion electricity
Road.
Background technology
In recent years, with low light technology and the high speed development of biochip technology, all kinds of sensor, photoelectric device meet the tendency of
And give birth to, it is widely used in industry, agriculture, the various fields such as military affairs.But the continuous improvement of technical merit requires research equipment
To greatly improving for the responsiveness of low level light signal.Low level light signal detection is developing high-tech, the important means of scientific research,
The height of low level light signal accuracy of detection often plays conclusive effect to performance of product etc..Low-light letter of the prior art
Easily there is the technological deficiency of distorted signals and signal concussion due to fault of construction in number photoelectric switching circuit, after conversion in use
Electric signal would generally carry more signal noise, and these signal noises can be brought seriously to the testing result of detected downstream device
Influence.Further, in low level light signal detecting system, the optical signal that usual electrooptical device is received is all very micro-
Weak, the electric signal after conversion is also unusual small (nA magnitudes).Therefore, amplifier noise, ambient noise, circuit noise, extraneous electricity
Magnetic disturbance etc. all can produce strong influence to the precision of detecting system.In addition, low level light signal opto-electronic conversion of the prior art
The bandwidth of circuit is generally than relatively low, it is impossible to while apply in various high-frequency circuit occasions, and then versatility is weaker.
Therefore a low level light signal photoelectric switching circuit is researched and developed to overcome above-mentioned at least one defect to turn into a kind of required.
Utility model content
The purpose of this utility model is to provide a kind of low level light signal photoelectric switching circuit, with converted signals noise it is small,
With it is wide, can effectively suppression circuit reflection advantage.
The purpose of this utility model is to be achieved through the following technical solutions：A kind of low level light signal photoelectric switching circuit, bag
Include：Electric current changes voltage and filtration module and filter and amplification module；The electric current conversion voltage and filtration module and the filtering
Amplification module is connected in series.
In preferred embodiments, the electric current conversion voltage and filtration module include：First resistor R1, second resistance
R21,3rd resistor R4, the 4th resistance R22, the 5th resistance R24, diode D1, the first electric capacity C21, the second electric capacity C24, the 3rd
Electric capacity C25, the 4th electric capacity C23 and the first operational amplifier U1；Wherein, dc source DC passes through the second resistance R21 and institute
Diode D1 negative pole connection is stated, the normal phase input end of the positive pole of the diode D1 and the first operational amplifier U1 connects
Connect；The negative pole of the diode D1 is grounded by the first electric capacity C21；The positive pole of the diode D1 and described first
It is grounded after resistance R1 series connection；The negative-phase input of the first operational amplifier U1 is grounded after being connected with the 3rd resistor R4；
The 3rd electric capacity C25 and the 4th resistance are connected in parallel between the negative-phase input and output end of the first operational amplifier U1
R22；The amplifier positive supply V+ of the first operational amplifier U1 is connected with circuit positive voltage VCC respectively, and with described
It is grounded after four electric capacity C23 connections；The amplifier negative supply V- of the first operational amplifier U1 respectively with circuit negative supply voltage-
VCC connections, and be grounded after being connected with the second electric capacity C24；The output end of the first operational amplifier U1 passes through the 5th electricity
Resistance R24 is connected with the filter and amplification module.
In preferred embodiments, the filter and amplification module includes：Second operational amplifier U2, the 6th resistance R2,
7th resistance R3, the 8th resistance R01, the 9th resistance R5, the 6th electric capacity C1, the 7th electric capacity C2 and the 8th electric capacity C3；Wherein, institute
The normal phase input end and the electric current for stating the second operational amplifier U2 change voltage and filtration module is connected；Second computing is put
Big device U2 normal phase input end is grounded after being connected with the 6th resistance R2；The negative input of the second operational amplifier U2
The 7th resistance R3 and the 6th electric capacity C1 is connected in parallel to respectively between end and output end；The amplifier of the second operational amplifier U2
Positive supply V+ is connected with circuit positive voltage VCC respectively, and is grounded after being connected with the 7th electric capacity C2；Second fortune
The amplifier negative supply V- for calculating amplifier U2 is connected with circuit negative supply voltage-VCC respectively, and after being connected with the 8th electric capacity C3
Ground connection；The output end of the second operational amplifier U2 is sequentially connected in series the 8th resistance R01 and the 9th resistance R5 and is followed by
Ground.
In preferred embodiments, the electric current conversion voltage and filtration module include：First resistor R1, second resistance
R21, the 4th resistance R22, the 5th resistance R24, diode D1, the second electric capacity C24, the 3rd electric capacity C25, the 4th electric capacity C23 and
One operational amplifier U1；Wherein, the normal phase input end of the first operational amplifier U1 is connected with the first resistor R1 is followed by
Ground；The negative-phase input of the first operational amplifier U1 is connected with the positive pole of the diode D1, and the diode D1's is negative
Pole is connected after being connected in series with the second resistance R21 with dc source DC；The negative input of the first operational amplifier U1
The 3rd electric capacity C25 and the 4th resistance R22 is parallel between end and output end；The amplifier of the first operational amplifier U1 is just
Power supply V+ is connected with circuit positive voltage VCC respectively, and is grounded after being connected with the 4th electric capacity C23；First computing
Amplifier U1 amplifier negative supply V- is connected with circuit negative supply voltage-VCC respectively, and after being connected with the second electric capacity C24
Ground connection；The output end of the first operational amplifier U1 is connected by the 5th resistance R24 with the filter and amplification module.
In preferred embodiments, the filter and amplification module includes：Second operational amplifier U2, the 6th resistance R2,
7th resistance R3, the 8th resistance R01, the 9th resistance R5, the tenth resistance R16, the 7th electric capacity C2 and the 8th electric capacity C3；Wherein, institute
The normal phase input end and the electric current for stating the second operational amplifier U2 change voltage and filtration module is connected；Second computing is put
Big device U2 normal phase input end is grounded after being connected with the 6th resistance R2；The negative input of the second operational amplifier U2
End is connected in series after the tenth resistance R16 and is grounded；Between the negative-phase input and output end of the second operational amplifier U2
It is connected in parallel to the 7th resistance R3；The amplifier positive supply V+ of the second operational amplifier U2 is electric with circuit positive supply respectively
Press VCC connections, and ground connection after being connected with the 7th electric capacity C2；The amplifier negative supply V- difference of the second operational amplifier U2
It is connected, and is grounded after being connected with the 8th electric capacity C3 with circuit negative supply voltage-VCC；The second operational amplifier U2's
Output end is sequentially connected in series after the 8th resistance R01 and the 9th resistance R5 and is grounded.
In preferred embodiments, the electric current conversion voltage and filtration module also include：First electric capacity C21, the 5th
Electric capacity C024, the 9th electric capacity C22, the tenth electric capacity C023 and the 11st electric capacity C26；The negative pole connection of the diode D1 is described
It is grounded after first electric capacity C21；The two ends of the second electric capacity C24 are connected in parallel with the 5th electric capacity C024；First fortune
The 3rd electric capacity C25 is connected between the negative-phase input and output end of calculating amplifier U1；The first operational amplifier U1
Negative-phase input be connected in parallel to described respectively with the 5th resistance R24 one end for being connected the filter and amplification module
Four resistance R22 and the 9th electric capacity C22；One end connection the described tenth of the 5th resistance R24 connections filter and amplification module
It is grounded after one electric capacity C26；The 4th electric capacity C23 two ends are connected in parallel to the tenth electric capacity C023.
In preferred embodiments, the filter and amplification module also includes：6th electric capacity C1, the 12nd electric capacity C00,
13 electric capacity C03, the 14th electric capacity C02 and the 11st resistance R00；Wherein, the positive input of the second operational amplifier U2
End is connected in series after the 11st resistance R00 to be connected with electric current conversion voltage and filtration module；The 6th resistance R2
Two ends be connected in parallel to the 12nd electric capacity C00；The two ends of the 7th resistance R3 are connected in parallel to the 6th electric capacity
C1；The two ends of the 7th electric capacity C2 are connected in parallel to the 14th electric capacity C02.
The beneficial effects of the utility model are：The utility model is by providing a kind of low level light signal photoelectric switching circuit, energy
It is enough that faint photo-signal is converted into voltage signal, and reduction noise can be filtered well；Further, the utility model
By adding impedance matching in foregoing circuit, the technical problem of circuit reflection is effectively solved；In addition, using above-mentioned low-light
After signal photoelectric switching circuit, its amplifying circuit can possess 200M bandwidth, can apply in various high-frequency circuit occasions.
Brief description of the drawings
The utility model is described in further detail below according to accompanying drawing.
Fig. 1 is low level light signal photoelectric switching circuit structural representation in the utility model embodiment 1；
Fig. 2 is electric current conversion voltage and filtration module electrical block diagram in the utility model embodiment 1；
Fig. 3 is filter and amplification module electrical block diagram in the utility model embodiment 1；
Fig. 3 a are that the filter that low level light signal photoelectric switching circuit is shown on oscillograph in the utility model embodiment 1 is made an uproar effect
Figure；
Fig. 4 is electric current conversion voltage and filtration module electrical block diagram in the utility model embodiment 2；
Fig. 5 is filter and amplification module electrical block diagram in the utility model embodiment 2；
Fig. 5 a are that the filter that is shown on oscillograph of low level light signal photoelectric switching circuit is made an uproar effect in the utility model embodiment 2
Figure；
Fig. 6 is electric current conversion voltage and filtration module electrical block diagram in the utility model embodiment 3；
Fig. 7 is filter and amplification module electrical block diagram in the utility model embodiment 3；
Fig. 7 a are that the filter that is shown on oscillograph of low level light signal photoelectric switching circuit is made an uproar effect in the utility model embodiment 3
Figure.
In figure：
DC, dc source；R1, first resistor；R21, second resistance；R4,3rd resistor；R22, the 4th resistance；R24,
Five resistance；R2, the 6th resistance；R3, the 7th resistance；R01, the 8th resistance；R5, the 9th resistance；R16, the tenth resistance；R00, the tenth
One resistance；D1, diode；C21, the first electric capacity；C24, the second electric capacity；C25, the 3rd electric capacity；C23, the 4th electric capacity；C024,
Five electric capacity；C1, the 6th electric capacity；C2, the 7th electric capacity；C3, the 8th electric capacity；C22, the 9th electric capacity；C023, the tenth electric capacity；C26,
11 electric capacity；C00, the 12nd electric capacity；C03, the 13rd electric capacity；C02, the 14th electric capacity；U1, the first operational amplifier；U2,
Two operational amplifiers.
Embodiment
It should be noted that the experimental results of the following embodiments of the utility model are by Anjelen Sci. ＆ Tech. Inc
Drawn after the same oscilloscope measurement of (Agilent Technologies) production.
Embodiment 1：
Without loss of generality, as shown in figure 1, providing a kind of low level light signal photoelectric switching circuit in the present embodiment, including：Electric current
Change voltage and filtration module 100 and filter and amplification module 200；The electric current conversion voltage and filtration module 100 and the filter
Ripple amplification module 200 is connected in series.The present embodiment by electric current by changing voltage and filtration module 100 and filter and amplification module
200 combine effective solve is converted to voltage signal faint photo-signal, and further can significantly filter out letter
The technical problem of number noise.
Further, as shown in Fig. 2 in an optimal technical scheme of the present embodiment, the electric current conversion voltage and
Filtration module includes：First resistor R1, second resistance R21,3rd resistor R4, the 4th resistance R22, the 5th resistance R24, two poles
Pipe D1, the first electric capacity C21, the second electric capacity C24, the 3rd electric capacity C25, the 4th electric capacity C23 and the first operational amplifier U1；Wherein,
Dc source DC is connected by the second resistance R21 with the negative pole of the diode D1, the positive pole of the diode D1 and institute
State the first operational amplifier U1 normal phase input end connection；The negative pole of the diode D1 passes through the first electric capacity C21
Ground connection；The positive pole of the diode D1 is grounded after being connected with the first resistor R1；The negative of the first operational amplifier U1
Input is grounded after being connected with the 3rd resistor R4；Between the negative-phase input and output end of the first operational amplifier U1
It is connected in parallel to the 3rd electric capacity C25 and the 4th resistance R22；The amplifier positive supply V+ of the first operational amplifier U1 respectively with electricity
Road positive voltage VCC connections, and be grounded after being connected with the 4th electric capacity C23；The amplifier of the first operational amplifier U1
Negative supply V- is connected with circuit negative supply voltage-VCC respectively, and is grounded after being connected with the second electric capacity C24；First fortune
The output end for calculating amplifier U1 is connected by the 5th resistance R24 with the filter and amplification module.
It is preferred that, in an optimal technical scheme of the present embodiment, in above-mentioned electric current changes voltage and filtration module,
Dc source DC supply voltage may be selected to be the selection of dc source DC supply voltage in 36~45V, the present embodiment
40V；First resistor R1 size is that 5.1K Ω, second resistance R21 size are that 150K Ω, 3rd resistor R4 size are 50
Ω, the 4th resistance R22 size are that 510 Ω, the 5th resistance R24 size are that 300 Ω, the first electric capacity C21 size are
10uF, the second electric capacity C24 size are that 0.1uF, the 3rd electric capacity C25 size are that 0.75pF, the 4th electric capacity C23 size are
0.1uF。
Further, as shown in figure 3, in an optimal technical scheme of the present embodiment, the filter and amplification module bag
Include：Second operational amplifier U2, the 6th resistance R2, the 7th resistance R3, the 8th resistance R01, the 9th resistance R5, the 6th electric capacity C1,
7th electric capacity C2 and the 8th electric capacity C3；Wherein, the normal phase input end of the second operational amplifier U2 changes electricity with the electric current
Pressure and filtration module connection；The normal phase input end of the second operational amplifier U2 is grounded after being connected with the 6th resistance R2；
The electricity of the 7th resistance R3 and the 6th is connected in parallel between the negative-phase input and output end of the second operational amplifier U2 respectively
Hold C1；The amplifier positive supply V+ of the second operational amplifier U2 is connected with circuit positive voltage VCC respectively, and with described
It is grounded after seven electric capacity C2 connections；The amplifier negative supply V- of the second operational amplifier U2 respectively with circuit negative supply voltage-VCC
Connection, and ground connection after be connected with the 8th electric capacity C3；The output end of the second operational amplifier U2 is sequentially connected in series institute
State and be grounded after the 8th resistance R01 and the 9th resistance R5.
It is preferred that, in an optimal technical scheme of the present embodiment, in above-mentioned filter and amplification module, the 6th resistance R2
Size be that 50 Ω, the 7th resistance R3 size are that 510 Ω, the 8th resistance R01 size are 50 Ω, the 9th resistance R5 size
For 50 Ω, the 6th electric capacity C1 size be 0.6pF, the 7th electric capacity C2 size be 0.1uF and the 8th electric capacity C3 size is
0.1uF。
Shown in Fig. 3 a, in an optimal technical scheme of the present embodiment, used in low level light signal photoelectric switching circuit
After the filter and amplification module shown in electric current conversion voltage and filtration module and Fig. 3 shown in Fig. 2, on the premise of bandwidth 200M,
It is 700mv with the noise data obtained after oscilloscope measurement, there is certain signal to noise ratio.By resistance electric current in this programme
Voltage is converted into, then is amplified, this circuit is suitably applied in signal than in larger circuit, but is not suitable for the micro- of PA ranks
Weak signal circuit, if foregoing circuit is applied in the small-signal circuit of PA ranks, easily causes signal in conversion amplification process
Middle distortion and signal concussion, and then cause amplifying circuit signal imperfect.
The utility model can change faint photo-signal by providing a kind of low level light signal photoelectric switching circuit
Into voltage signal, and reduction noise can be filtered well；Further, the utility model in foregoing circuit by adding impedance
Matching, effectively solves the technical problem of circuit reflection；In addition, after using above-mentioned low level light signal photoelectric switching circuit, it is put
Big circuit can possess 200M bandwidth, can apply in various high-frequency circuit occasions.
Embodiment 2：
As shown in figure 4, the present embodiment is on the basis of embodiment 1, the electric current conversion voltage and filtration module include：The
One resistance R1, second resistance R21, the 4th resistance R22, the 5th resistance R24, diode D1, the second electric capacity C24, the 3rd electric capacity
C25, the 4th electric capacity C23 and the first operational amplifier U1；Wherein, the normal phase input end of the first operational amplifier U1 with it is described
It is grounded after first resistor R1 series connection；The negative-phase input of the first operational amplifier U1 connects with the positive pole of the diode D1
Connect, the negative pole of the diode D1 is connected after being connected in series with the second resistance R21 with dc source DC；First computing
The 3rd electric capacity C25 and the 4th resistance R22 is parallel between amplifier U1 negative-phase input and output end respectively；It is described
First operational amplifier U1 amplifier positive supply V+ is connected with circuit positive voltage VCC respectively, and with the 4th electric capacity C23
It is grounded after connection；The amplifier negative supply V- of the first operational amplifier U1 is connected with circuit negative supply voltage-VCC respectively, and
It is grounded after being connected with the second electric capacity C24；The output end of the first operational amplifier U1 by the 5th resistance R24 with
The filter and amplification module connection.
It is preferred that, in an optimal technical scheme of the present embodiment, in above-mentioned electric current changes voltage and filtration module,
First resistor R1 size is that 50 Ω, second resistance R21 size are that 150K Ω, the 4th resistance R22 size are 51 Ω, the 5th
Resistance R24 size is that 50 Ω, the second electric capacity C24 size are that 0.1uF, the 3rd electric capacity C25 size are 30pF, the 4th electricity
The size for holding C23 is 0.1uF.
Further, as shown in figure 5, in an optimal technical scheme of the present embodiment, the filter and amplification module bag
Include：Second operational amplifier U2, the 6th resistance R2, the 7th resistance R3, the 8th resistance R01, the 9th resistance R5, the tenth resistance R16,
7th electric capacity C2 and the 8th electric capacity C3；Wherein, the normal phase input end of the second operational amplifier U2 changes electricity with the electric current
Pressure and filtration module connection；The normal phase input end of the second operational amplifier U2 is grounded after being connected with the 6th resistance R2；
The negative-phase input of the second operational amplifier U2 is connected in series after the tenth resistance R16 and is grounded；Second computing is put
The 7th resistance R3 is connected in parallel between big device U2 negative-phase input and output end；The second operational amplifier U2
Amplifier positive supply V+ be connected respectively with circuit positive voltage VCC, and be grounded after being connected with the 7th electric capacity C2；Described
Two operational amplifier U2 amplifier negative supply V- is connected with circuit negative supply voltage-VCC respectively, and with the 8th electric capacity C3
It is grounded after connection；The output end of the second operational amplifier U2 is sequentially connected in series the 8th resistance R01 and the 9th resistance
It is grounded after R5.
It is preferred that, in an optimal technical scheme of the present embodiment, in above-mentioned filter and amplification module, the 6th resistance R2
Size be that 50 Ω, the 7th resistance R3 size are that 510 Ω, the 8th resistance R01 size are 50 Ω, the 9th resistance R5 size
For 50 Ω, the tenth resistance R16 size be 50 Ω, the 7th electric capacity C2 size be 0.1uF and the 8th electric capacity C3 size is
0.1uF。
Shown in Fig. 5 a, in an optimal technical scheme of the present embodiment, used in low level light signal photoelectric switching circuit
After the filter and amplification module shown in electric current conversion voltage and filtration module and Fig. 5 shown in Fig. 4, on the premise of bandwidth 200M,
It is 400mv with the noise data obtained after oscilloscope measurement, there is certain signal to noise ratio.By improving the electricity in embodiment 1
Line structure, using the smaller chip of base current, can be timely responded to small-signal, and the low level light signal photoelectricity after improvement turns
The technological deficiency that circuit has overcome distorted signals and signal to shake is changed, and signal noise can be greatly reduced.
Embodiment 3：
As shown in fig. 6, the present embodiment 3 is on the basis of embodiment 2, the electric current conversion voltage and filtration module are also wrapped
Include：First electric capacity C21, the 5th electric capacity C024, the 9th electric capacity C22, the tenth electric capacity C023 and the 11st electric capacity C26；Two pole
Pipe D1 negative pole is connected and is grounded after the first electric capacity C21；The two ends of the second electric capacity C24 and the 5th electric capacity C024 are simultaneously
Connection connection；The 3rd electric capacity C25 is connected between the negative-phase input and output end of the first operational amplifier U1；It is described
Between first operational amplifier U1 negative-phase input and one end of the 5th resistance R24 connections filter and amplification module simultaneously
Connection is connected with the 4th resistance R22 and the 9th electric capacity C22；The one of the 5th resistance R24 connections filter and amplification module
It is grounded after end connection the 11st electric capacity C26；The 4th electric capacity C23 two ends are connected in parallel to the tenth electric capacity C023.
The 11st electric capacity C26 setting can effectively filter out high frequency spurs in the present embodiment, be provided for the operation of next step filter and amplification
Strong structural support.
It is preferred that, in an optimal technical scheme of the present embodiment, in above-mentioned electric current changes voltage and filtration module,
First electric capacity C21 size be 0.1uF, the 5th electric capacity C024 size be 10uF, the 9th electric capacity C22 size be 0.25pF,
Tenth electric capacity C023 size is that 10uF, the 11st electric capacity C26 size are that 0.5pF, the 3rd electric capacity C25 size are 0.35pF
And the 5th resistance R24 size be 220 Ω.
Further, as shown in fig. 7, in an optimal technical scheme of the present embodiment, the filter and amplification module is also
Including：6th electric capacity C1, the 12nd electric capacity C00, the 13rd electric capacity C03, the 14th electric capacity C02 and the 11st resistance R00；Its
In, the normal phase input end of the second operational amplifier U2 is connected in series after the 11st resistance R00 to be changed with the electric current
Voltage and filtration module connection；The two ends of the 6th resistance R2 are connected in parallel to the 12nd electric capacity C00；Described 7th
Resistance R3 two ends are connected in parallel to the 6th electric capacity C1；The two ends of the 7th electric capacity C2 are connected in parallel to the described 14th
Electric capacity C02.
It is preferred that, in an optimal technical scheme of the present embodiment, in above-mentioned filter and amplification module, the 11st resistance
R00 size is that 50 Ω, the 6th electric capacity C1 size are that 0.6pF, the 12nd electric capacity C00 size are 10pF, the 13rd electric capacity
C03 size is 10uF, and the 14th electric capacity C02 size is 10uF.
Shown in Fig. 7 a, in an optimal technical scheme of the present embodiment, used in low level light signal photoelectric switching circuit
After the filter and amplification module shown in electric current conversion voltage and filtration module and Fig. 7 shown in Fig. 6, with what is obtained after oscilloscope measurement
Noise data is 140mv.The present embodiment further improves circuit structure on the basis of embodiment 2, constant in bandwidth 200M
In the case of, filter function is added, output signal is stabilized using bridge circuit, and then has reached and further reduces signal
The technique effect of noise.
The utility model is not limited to above-mentioned preferred forms, and anyone can draw under enlightenment of the present utility model
Other various forms of products, however, make any change in its shape or structure, it is every that there is same as the present application or phase
Approximate technical scheme, all falls within protection domain of the present utility model.
Claims (7)
1. a kind of low level light signal photoelectric switching circuit, it is characterised in that：Including：Electric current changes voltage and filtration module and filtering is put
Big module；The electric current conversion voltage and filtration module and the filter and amplification module are connected in series.
2. low level light signal photoelectric switching circuit according to claim 1, it is characterised in that：The electric current conversion voltage and filter
Ripple module includes：First resistor (R1), second resistance (R21), 3rd resistor (R4), the 4th resistance (R22), the 5th resistance
(R24), diode (D1), the first electric capacity (C21), the second electric capacity (C24), the 3rd electric capacity (C25), the 4th electric capacity (C23) and
One operational amplifier (U1)；
Wherein, dc source (DC) is connected by the second resistance (R21) with the negative pole of the diode (D1), two pole
The positive pole of pipe (D1) is connected with the normal phase input end of first operational amplifier (U1)；The negative pole of the diode (D1) passes through
First electric capacity (C21) ground connection；The positive pole of the diode (D1) is grounded after being connected with the first resistor (R1)；Described
The negative-phase input of one operational amplifier (U1) is grounded after being connected with the 3rd resistor (R4)；First operational amplifier
(U1) the 3rd electric capacity (C25) and the 4th resistance (R22) are connected in parallel between negative-phase input and output end；First fortune
Calculate amplifier (U1) amplifier positive supply (V+) be connected respectively with circuit positive voltage (VCC), and with the 4th electric capacity
(C23) it is grounded after connecting；The amplifier negative supply (V-) of first operational amplifier (U1) respectively with circuit negative supply voltage (-
VCC) connect, and ground connection after be connected with second electric capacity (C24)；The output end of first operational amplifier (U1) passes through
Five resistance (R24) are connected with the filter and amplification module.
3. low level light signal photoelectric switching circuit according to claim 2, it is characterised in that：The filter and amplification module bag
Include：Second operational amplifier (U2), the 6th resistance (R2), the 7th resistance (R3), the 8th resistance (R01), the 9th resistance (R5),
Six electric capacity (C1), the 7th electric capacity (C2) and the 8th electric capacity (C3)；
Wherein, the normal phase input end of second operational amplifier (U2) changes voltage with the electric current and filtration module is connected；
The normal phase input end of second operational amplifier (U2) is grounded after being connected with the 6th resistance (R2)；Second computing is put
The 7th resistance (R3) and the 6th electric capacity (C1) are connected in parallel to respectively between the negative-phase input and output end of big device (U2)；It is described
The amplifier positive supply (V+) of second operational amplifier (U2) is connected with circuit positive voltage (VCC) respectively, and with the described 7th
It is grounded after electric capacity (C2) connection；The amplifier negative supply (V-) of second operational amplifier (U2) respectively with circuit negative supply voltage
(- VCC) is connected, and ground connection after be connected with the 8th electric capacity (C3)；The output end of second operational amplifier (U2) is successively
It is connected in series the 8th resistance (R01) and the 9th resistance (R5) is grounded afterwards.
4. low level light signal photoelectric switching circuit according to claim 1, it is characterised in that：The electric current conversion voltage and filter
Ripple module includes：First resistor (R1), second resistance (R21), the 4th resistance (R22), the 5th resistance (R24), diode (D1),
Second electric capacity (C24), the 3rd electric capacity (C25), the 4th electric capacity (C23) and the first operational amplifier (U1)；
Wherein, it is grounded after the normal phase input end of first operational amplifier (U1) is connected with the first resistor (R1)；It is described
The negative-phase input of first operational amplifier (U1) is connected with the positive pole of the diode (D1), the negative pole of the diode (D1)
It is connected after being connected in series with the second resistance (R21) with dc source (DC)；The negative of first operational amplifier (U1)
The 3rd electric capacity (C25) and the 4th resistance (R22) are connected in parallel between input and output end；First operation amplifier
The amplifier positive supply (V+) of device (U1) is connected with circuit positive voltage (VCC) respectively, and is connected with the 4th electric capacity (C23)
After be grounded；The amplifier negative supply (V-) of first operational amplifier (U1) is connected with circuit negative supply voltage (- VCC) respectively,
And be grounded after being connected with second electric capacity (C24)；The output end of first operational amplifier (U1) passes through the described 5th electricity
Resistance (R24) is connected with the filter and amplification module.
5. low level light signal photoelectric switching circuit according to claim 4, it is characterised in that：The filter and amplification module bag
Include：Second operational amplifier (U2), the 6th resistance (R2), the 7th resistance (R3), the 8th resistance (R01), the 9th resistance (R5),
Ten resistance (R16), the 7th electric capacity (C2) and the 8th electric capacity (C3)；
Wherein, the normal phase input end of second operational amplifier (U2) changes voltage with the electric current and filtration module is connected；
The normal phase input end of second operational amplifier (U2) is grounded after being connected with the 6th resistance (R2)；Second computing is put
The negative-phase input of big device (U2) is connected in series the tenth resistance (R16) and is grounded afterwards；Second operational amplifier (U2)
The 7th resistance (R3) is connected in parallel between negative-phase input and output end；The amplifier of second operational amplifier (U2)
Positive supply (V+) is connected with circuit positive voltage (VCC) respectively, and is grounded after being connected with the 7th electric capacity (C2)；Described
The amplifier negative supply (V-) of two operational amplifiers (U2) is connected with circuit negative supply voltage (- VCC) respectively, and with the described 8th electricity
It is grounded after holding (C3) connection；The output end of second operational amplifier (U2) is sequentially connected in series the 8th resistance (R01)
It is grounded afterwards with the 9th resistance (R5).
6. low level light signal photoelectric switching circuit according to claim 4, it is characterised in that：The electric current conversion voltage and filter
Ripple module also includes：First electric capacity (C21), the 5th electric capacity (C024), the 9th electric capacity (C22), the tenth electric capacity (C023) and the tenth
One electric capacity (C26)；The negative pole of the diode (D1) connects first electric capacity (C21) and is grounded afterwards；Second electric capacity (C24)
Two ends be connected in parallel with the 5th electric capacity (C024)；The negative-phase input and output end of first operational amplifier (U1)
Between be connected with the 3rd electric capacity (C25)；The negative-phase input of first operational amplifier (U1) and the 5th resistance
(R24) the 4th resistance (R22) and the 9th electric capacity are connected in parallel between the one end for connecting the filter and amplification module
(C22)；One end connection the 11st electric capacity (C26) that 5th resistance (R24) connects the filter and amplification module is followed by
Ground；4th electric capacity (C23) two ends are connected in parallel to the tenth electric capacity (C023).
7. low level light signal photoelectric switching circuit according to claim 5, it is characterised in that：The filter and amplification module is also wrapped
Include：6th electric capacity (C1), the 12nd electric capacity (C00), the 13rd electric capacity (C03), the 14th electric capacity (C02) and the 11st resistance
(R00)；Wherein, the normal phase input end of second operational amplifier (U2) be connected in series the 11st resistance (R00) afterwards with
The electric current conversion voltage and filtration module connection；The two ends of 6th resistance (R2) are connected in parallel to the 12nd electric capacity
(C00)；The two ends of 7th resistance (R3) are connected in parallel to the 6th electric capacity (C1)；The two ends of 7th electric capacity (C2)
It is connected in parallel to the 14th electric capacity (C02).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621289732.8U CN206442356U (en) | 2016-11-29 | 2016-11-29 | A kind of low level light signal photoelectric switching circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621289732.8U CN206442356U (en) | 2016-11-29 | 2016-11-29 | A kind of low level light signal photoelectric switching circuit |
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| Publication Number | Publication Date |
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| CN206442356U true CN206442356U (en) | 2017-08-25 |
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| CN201621289732.8U Expired - Fee Related CN206442356U (en) | 2016-11-29 | 2016-11-29 | A kind of low level light signal photoelectric switching circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108775907A (en) * | 2018-06-11 | 2018-11-09 | 佛山市顺德区蚬华多媒体制品有限公司 | Photoelectric sensor circuit and photoelectric sensor |
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2016
- 2016-11-29 CN CN201621289732.8U patent/CN206442356U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108775907A (en) * | 2018-06-11 | 2018-11-09 | 佛山市顺德区蚬华多媒体制品有限公司 | Photoelectric sensor circuit and photoelectric sensor |
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