CN209117036U - A kind of gyro photoelectric detective circuit - Google Patents
A kind of gyro photoelectric detective circuit Download PDFInfo
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- CN209117036U CN209117036U CN201821906560.3U CN201821906560U CN209117036U CN 209117036 U CN209117036 U CN 209117036U CN 201821906560 U CN201821906560 U CN 201821906560U CN 209117036 U CN209117036 U CN 209117036U
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- electronic switch
- gyro
- capacitor
- operational amplifier
- photoelectric detective
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Abstract
The utility model provides a kind of gyro photoelectric detective circuit, including controller, operational amplifier, the first electronic switch, the second electronic switch, photodiode P1, first resistor R1；The one end the first resistor R1 is connect with the cathode of photodiode P1, and the other end is connected with supply voltage end, and the voltage value at the supply voltage end is negative value；The reverse inter-input-ing ending grounding of operational amplifier further includes the first capacitor C1 parallel with one another with the second electronic switch；A connecting pin, another connecting pin of first electronic switch are connect with the non-inverting input terminal of the anode of photodiode P1, operational amplifier respectively；A connecting pin, another connecting pin of second electronic switch are connect with the output end of operational amplifier, non-inverting input terminal respectively；The control terminal of first electronic switch, the control terminal of the second electronic switch are connect with the output end of controller respectively.
Description
Technical field
The utility model is specifically related to the improvement of optical fibre gyro photoelectric detective circuit, belong to the test of optical fibre gyro, calibration,
Error compensation field.
Background technique
In optical fibre gyro, the signal that the process of interference signal converted electrical number largely affects optical fibre gyro is examined
Survey precision.In existing optical fibre gyro measurement circuit design scheme, photodetector assembly is generallyd use to realize.Photoelectricity is visited
It surveys device assembly mainly to consist of two parts, a part is PIN photodiode, and another part is FET front end circuit.PIN photoelectricity
Diode has many advantages, such as that small dark current, high sensitivity, response wave length scope are wide, and FET pre-amplification circuit has high impedance, energy
Enough and PIN photodiode forms preferable matching, is conducive to reduce external disturbance and stray capacitance etc..But existing photoelectricity
In probe assembly, the resistance of bridging is generally provided between the input terminal of operational amplifier and output end (across resistance).Photoelectricity is visited
The performance for surveying component is directly related across resistance to it, is usually 10 across resistance3~106Ω, since Resistance Thermal Noise power spectral density is straight
It connects directly proportional to resistance value size, therefore biggish thermal noise can be introduced across resistance, therefore the existing gyro photoelectricity inspection having across resistance
Slowdown monitoring circuit is affected by thermal noise, to cause many big influences to high-precision optical fiber gyro performance, is unable to satisfy
The requirement of inertia measurement.
Utility model content
Problem to be solved in the utility model can be introduced biggish heat across resistance and makes an uproar for providing in photoelectric sensor assembly
The problem of sound, provides a kind of gyro photoelectric detective circuit.
In order to solve the above technical problems, the technical solution adopted in the utility model is: a kind of gyro photoelectric detective circuit, packet
Include controller, operational amplifier, the first electronic switch, the second electronic switch, photodiode P1, first resistor R1；Described
One one end resistance R1 is connect with the cathode of photodiode P1, and the other end is connected with supply voltage end, the supply voltage end
Voltage value is negative value；The reverse inter-input-ing ending grounding of the operational amplifier further includes parallel with one another with second electronic switch
First capacitor C1；One connecting pin of first electronic switch, another connecting pin respectively with photodiode P1 just
The non-inverting input terminal connection of pole, the operational amplifier；A connecting pin, another connecting pin point of second electronic switch
It is not connect with the output end of operational amplifier, non-inverting input terminal；The control terminal of first electronic switch, the second electronic switch
Control terminal is connect with the output end of controller respectively.
Further, another connecting pin of first electronic switch, second electronic switch control terminal point
Pull-up resistor is not connected with it.
Further, the one end for further including the second capacitor C2, the second capacitor C2 and the photodiode P1 are just
Pole connection, the other end ground connection of the second capacitor C2.
It further, further include the first filter circuit being connect with the output end of the operational amplifier.
Further, first filter circuit is RC filter circuit.
Further, first filter circuit includes 3rd resistor R3, the 4th resistance R4, third capacitor C3, the 4th electricity
Hold C4；The output end of the operational amplifier passes sequentially through 3rd resistor R3, third capacitor C3 and gyro photoelectric detective circuit
Output end connection；One end of the 4th capacitor C4 is connected between 3rd resistor R3 and third capacitor C3, the 4th capacitor
The other end of C4 is grounded；One end of the 4th resistance R4 is connected to the output end of third capacitor C3 Yu gyro photoelectric detective circuit
Between, the other end of the 4th resistance R4 is grounded.
Further, is connected between the output end of first electronic switch and the non-inverting input terminal of operational amplifier
Two resistance R2.
Further, the operational amplifier is instrument operational amplifier.
Further, first electronic switch, the second electronic switch are integrated in switch chip.
Further, the switch chip is DG612ADQ, the model AD8066 of the operational amplifier.
The utility model has the advantages and positive effects of: in the utility model, in the homophase input of operational amplifier
First capacitor C1 is set between end and output end, big gain is obtained by small capacitor, to avoid existing Photoelectric Detection electricity
High impedance bring thermal noise problem in road in transimpedance preamplifier.By the way that the first electronic switch, the second electronics is arranged
Switch, can be integrated to the weak current in certain time and keep to reduce the noise level of gyro, and believing
Voltage stabilization during number keeping, it is only necessary to which primary sampling can reduce gyro photoelectric detective circuit rear end ADC conversion circuit
Sample frequency improve the Electro Magnetic Compatibility of gyro to reduce sampling clock bring noise jamming.The utility model
In, it is only necessary to using controller output high level or low level signal, the first electronic switch, the second electronic switch can be realized
Control, control is simple, and noise is small.
Detailed description of the invention
In order to more clearly explain the technical solutions in the embodiments of the present application, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, the drawings in the following description are only some examples of the present application, for
For those of ordinary skill in the art, without any creative labor, it can also be obtained according to these attached drawings
His attached drawing.
Fig. 1 is the electrical block diagram of the gyro photoelectric detective circuit of the embodiments of the present invention.
Fig. 2 is the electrical block diagram of first electronic switch of the embodiments of the present invention.
Fig. 3 is the electrical block diagram of second electronic switch of the embodiments of the present invention.
Fig. 4 be the control terminal of first electronic switch of the embodiments of the present invention, the control terminal of the second electronic switch with
The electrical block diagram of controller connection.
Specific embodiment
Below in conjunction with the attached drawing of the application, the technical scheme in the embodiment of the application is clearly and completely described,
Obviously, described embodiments are only a part of embodiments of the present application, instead of all the embodiments.Based in the application
Embodiment, every other embodiment obtained by those of ordinary skill in the art without making creative efforts, all
Belong to the range of the application protection.
As shown in Fig. 1-Fig. 4, the utility model provides a kind of gyro photoelectric detective circuit, including controller 10, operation are put
Big device 20, the first electronic switch 1, the second electronic switch 2, photodiode P1；The cathode of photodiode P1 is connected in turn
First resistor R1, for providing the supply voltage end VA of voltage, the voltage value of supply voltage end VA is negative value.Such as the voltage of VA
It can be -5V, as long as guaranteeing that photodiode P1 is worked normally.The reverse inter-input-ing ending grounding of operational amplifier 20 further includes
The first capacitor C1 parallel with one another with the second electronic switch 2；A connecting pin 11, another connecting pin of first electronic switch 1
12 connect with the non-inverting input terminal of the anode of photodiode P1, operational amplifier 20 respectively；One company of the second electronic switch 2
End 21, another connecting pin 22 is connect to connect with the output end of operational amplifier 20, non-inverting input terminal respectively；First electronic switch 1
Control terminal 13, the control terminal 23 of the second electronic switch 2 connect with the output end of controller 10 respectively.First capacitor C1, second
Electronic switch 2 is parallel with one another between the non-inverting input terminal of operational amplifier 20, output end.
First electronic switch 1 is to keep switch.Second electronic switch 2 is reset switch.
One connecting pin 21 of the second electronic switch 2 is expressed as ON1, another 22 table of connecting pin of the second electronic switch 2
It is shown as ON2.
Controller 10 can be single-chip microcontroller or DSP or FPGA.
The resistance value of first resistor R1 is 10k Ω.
The resistance value of second resistance R2 is 1k Ω.
5th resistance R5, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8 resistance value can according to Practical Project demand into
Row selection, those of ordinary skill in the art will appreciate that.
3rd resistor R3, the 4th resistance R4 resistance value be respectively 51 Ω, 100k Ω.
The capacitance of first capacitor C1 is 470pF.
The capacitance of second capacitor C2 is 0.1 μ F.
The capacitance of third capacitor C3 is 2.2 μ F, and pressure resistance is 25V.The capacitance of 4th capacitor C4 is 1nF.
Settable resistance between one connecting pin 21 of the second electronic switch 2 and the output end of operational amplifier 20, the electricity
The resistance value of resistance can be 2.15k Ω.
When the control terminal 13 of first electronic switch 1 is respectively high level or low level, a connection of the first electronic switch 1
End 11, another connecting pin 12 are connected with each other or disconnect；The control terminal 23 of second electronic switch 2 is respectively high level or low level
When, a connecting pin 21, another connecting pin 22 of operational amplifier 20 are connected with each other or disconnect；The voltage value at supply voltage end
For -5V.
The control terminal 13 of first electronic switch 1, the control terminal 23 of the second electronic switch 2 are connected separately with pull-up resistor.
As shown in figure 4, the control terminal 13 of the first electronic switch 1 passes sequentially through the 5th resistance R5, the 6th resistance R6 and positive electricity
Source connection.Output end (such as the IO of controller 10 of junction between 5th resistance R5, the 6th resistance R6 and controller 10
Mouthful) electrical connection, K-P1 signal is provided by the output end of controller 10.K-P1 signal is high level or low level.
The control terminal 23 of second electronic switch 2 passes sequentially through the 7th resistance R7, the 8th resistance R8 is connect with positive power source terminal.The
Junction between seven resistance R7, the 8th resistance R8 is electrically connected with the output end (such as I/O port of controller 10) of controller 10,
K-P2 signal is provided by the output end of controller 10.K-P2 signal is high level or low level.Positive power source terminal can be+5V.
In the utility model, in the initial phase that controller 10 works, the K-P1 that the output end of controller 10 provides believes
Number, K-P2 signal be low level, then the first electronic switch 1, the second electronic switch 2 are off-state.During the work time,
K-P1 signal is high level, and K-P2 signal is low level, and the first electronic switch 1 is closed, and the second electronic switch disconnects, and starts to integrate
Process.Then K-P1 signal is low level, and K-P2 signal is high level.
It can not be the control terminal 13, first of the first electronic switch 1 in controller 10 by the way that pull-up resistor R8, R6 is arranged
When the control terminal 23 of electronic switch 2 provides high level or low level signal, by the 13, first electricity of control terminal of the first electronic switch 1
The signal level of the control terminal 23 of sub switch 2 is fixed on high level, avoids circuit unstable.
Gyro photoelectric detective circuit further includes one end of the second capacitor C2, the second capacitor C2 and the anode of photodiode P1
Connection, the other end ground connection of the second capacitor C2.
Capacitor C2 is shunt capacitance, and the capacitance of capacitor C2 is 0.1uF.Capacitor C2 can will opened due to the first electronic switch
The high-frequency noise generated during changing with concern filters out, and weakens disturbance caused by the switching process of the first electronic switch 1 to electricity
The influence on road.
Gyro photoelectric detective circuit further includes the first filter circuit 30 connecting with the output end of operational amplifier 20.
The output end of first filter circuit 30 is the output end VOUT of gyro photoelectric detective circuit in the utility model.
First filter circuit 30 is RC filter circuit.First filter circuit 30 is low-pass filter or high-pass filter or band
Bandpass filter.The form and its characteristic frequency of the first filter circuit 30, ordinary skill people can be selected according to actual needs
Member is understood that.
In the utility model, the output end of operational amplifier 20 passes sequentially through 3rd resistor R3, third capacitor C3 and gyro
The output end VOUT connection of photoelectric detective circuit.One end of 4th capacitor C4 be connected to 3rd resistor R3 and third capacitor C3 it
Between, other end ground connection.One end of 4th resistance R4 is connected between third capacitor C3 and output end VOUT, other end ground connection.
Second is connected between another connecting pin 12 of first electronic switch 1 and the non-inverting input terminal of operational amplifier 20
Resistance R2.By the way that second resistance R2 is arranged, the reflection between two end signal of second resistance R2 can be weakened in high-frequency signal.
Operational amplifier 20 is instrument operational amplifier.First electronic switch 1, the second electronic switch 2 are integrated in switch
In chip 40.Switch chip 40 is DG612ADQ, the model AD8066 of operational amplifier 20.
High-performance optical electro-detection technology principle is exactly the Sampling Integral device method in synchronous backing space technique, with existing photodetection
Device assembly circuit is compared, and since not big resistance value is across resistance, can reduce noise jamming.
As shown in Figure 1, optical signal is converted to ultra-weak electronic signal by photodiode P1, switch chip 40 be analog switch and
There is four-way switch channel, utilizes two channels therein in the utility model, the two of them channel of switch chip 40 is made respectively
To keep switch, reset switch, on and off function is realized under the control of signal K-P1, K-P2 that controller 10 exports respectively.
Instrument operational amplifier and periphery resistance capacitance realize the amplification and low-pass filtering of small-signal.
The circuit realizes the integral of the current signal to input PIN pipe using two analog switches and an integrating circuit,
Obtain voltage output:
As can be seen from the above equation, output voltage is inversely proportional with integrating capacitor C1, as long as therefore capacitor C1 selection it is suitable, can
It is exported with generating biggish voltage signal to faint current signal integral in a relatively short period of time.In the present embodiment, gyro light
Power detection circuit is applied to superhigh precision gyro (the long 1500m of fiber optic loop), for example, IPIN=5uA, t=11us, C1=470pF,
The then voltage VOUT=-2.5V of the output end of gyro photoelectric detective circuit.
By the gyro photoelectric detective circuit, big gain can be obtained by small capacitor C1, so as to prevent across
High impedance bring thermal noise problem in impedance preamplifier.And the weak current in time t is integrated and kept
The noise level of gyro, and the voltage stabilization during signal is kept can be reduced, it is only necessary to which primary sampling can reduce
The sample frequency of the ADC conversion circuit of gyro photoelectric detective circuit rear end mentions to reduce sampling clock bring noise jamming
The Electro Magnetic Compatibility of high gyro.
It should be noted that all the embodiments in this specification are described in a progressive manner, each embodiment weight
Point explanation is the difference from other embodiments, and the same or similar parts between the embodiments can be referred to each other.
The embodiments of the present invention are described in detail above, but the content is only the preferable of the utility model
Embodiment should not be considered as limiting the scope of the present invention.It is all to become according to equalization made by the scope of the utility model
Change and improve etc., it shall still fall within the scope of this patent.After having read the utility model, those skilled in the art
Member each falls within the application range as defined in the appended claims to the modification of the various equivalent forms of the utility model.It is not rushing
In the case where prominent, the feature in the embodiments of the present invention and embodiment be can be combined with each other.
Claims (10)
1. a kind of gyro photoelectric detective circuit, it is characterised in that: including controller (10), operational amplifier (20), the first electronics
Switch (1), the second electronic switch (2), photodiode P1, first resistor R1；
The one end the first resistor R1 is connect with the cathode of photodiode P1, and the other end is connected with supply voltage end, the confession
The voltage value at piezoelectric voltage end is negative value；
The reverse inter-input-ing ending grounding of the operational amplifier (20) further includes parallel with one another with second electronic switch (2)
First capacitor C1；
One connecting pin (11) of first electronic switch (1), another connecting pin (12) are respectively with photodiode P1's
The non-inverting input terminal of positive, the described operational amplifier (20) connects；
One connecting pin (21) of second electronic switch (2), another connecting pin (22) respectively with operational amplifier (20)
Output end, non-inverting input terminal connection；
The control terminal (13) of first electronic switch (1), the control terminal (23) of the second electronic switch (2) respectively with controller
(10) output end connection.
2. gyro photoelectric detective circuit according to claim 1, it is characterised in that: the control of first electronic switch (1)
End (13) processed, second electronic switch (2) control terminal (23) be connected separately with pull-up resistor.
3. gyro photoelectric detective circuit according to claim 1, it is characterised in that: it further include the second capacitor C2, described
One end of two capacitor C2 is connect with the anode of the photodiode P1, the other end ground connection of the second capacitor C2.
4. gyro photoelectric detective circuit according to claim 1, it is characterised in that: further include and the operational amplifier
(20) the first filter circuit (30) of output end connection.
5. gyro photoelectric detective circuit according to claim 4, it is characterised in that: first filter circuit (30) is RC
Filter circuit.
6. gyro photoelectric detective circuit according to claim 4, it is characterised in that: first filter circuit (30) includes
3rd resistor R3, the 4th resistance R4, third capacitor C3, the 4th capacitor C4；The output end of the operational amplifier (20) successively leads to
Cross 3rd resistor R3, third capacitor C3 is connect with the output end of gyro photoelectric detective circuit；One end of the 4th capacitor C4 connects
It connects between 3rd resistor R3 and third capacitor C3, the other end ground connection of the 4th capacitor C4；The one of the 4th resistance R4
End is connected between third capacitor C3 and the output end of gyro photoelectric detective circuit, the other end ground connection of the 4th resistance R4.
7. gyro photoelectric detective circuit according to claim 1 to 6, it is characterised in that: first electronic cutting
It closes and is connected with second resistance R2 between another connecting pin (12) and the non-inverting input terminal of operational amplifier (20) of (1).
8. gyro photoelectric detective circuit according to claim 1 to 6, it is characterised in that: the operational amplifier
It (20) is instrument operational amplifier.
9. gyro photoelectric detective circuit according to claim 1 to 6, it is characterised in that: first electronic cutting
Close (1), the second electronic switch (2) is integrated in switch chip (40).
10. gyro photoelectric detective circuit according to claim 9, it is characterised in that: the switch chip (40) is
DG612ADQ, the model AD8066 of the operational amplifier (20).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821906560.3U CN209117036U (en) | 2018-11-20 | 2018-11-20 | A kind of gyro photoelectric detective circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821906560.3U CN209117036U (en) | 2018-11-20 | 2018-11-20 | A kind of gyro photoelectric detective circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209117036U true CN209117036U (en) | 2019-07-16 |
Family
ID=67205755
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821906560.3U Active CN209117036U (en) | 2018-11-20 | 2018-11-20 | A kind of gyro photoelectric detective circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209117036U (en) |
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2018
- 2018-11-20 CN CN201821906560.3U patent/CN209117036U/en active Active
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