CN207910749U - A kind of window voltage comparison circuit - Google Patents
A kind of window voltage comparison circuit Download PDFInfo
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- CN207910749U CN207910749U CN201820343605.4U CN201820343605U CN207910749U CN 207910749 U CN207910749 U CN 207910749U CN 201820343605 U CN201820343605 U CN 201820343605U CN 207910749 U CN207910749 U CN 207910749U
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- window
- operational amplifier
- resistance
- voltage
- photoelectrical coupler
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Abstract
The utility model discloses a kind of window voltage comparison circuits, including：First operational amplifier, second operational amplifier, the first photoelectrical coupler and the second photoelectrical coupler；First operational amplifier and second operational amplifier control the comparing voltage value of signal and window width control signal change window voltage comparison circuit according to voltage to be compared, the window's position of input, first photoelectrical coupler and the second photoelectrical coupler export comparison result according to the comparing voltage value of window voltage comparison circuit, realize that window voltage compares.Window position and window width can be automatically adjusted using the window voltage comparison circuit of the utility model, realize that the tracking for treating comparison voltage is compared.
Description
Technical field
The utility model is related to voltage signal survey control technology field more particularly to a kind of window voltage comparison circuits.
Background technology
Window voltage comparison circuit is a kind of voltage whether being between two known levels for judging input voltage
Comparator is widely used in automatic detection circuit, fault detection circuit, A/D conversion circuits, high speed sampling circuit, waveform and becomes
It changes in circuit, supply voltage monitoring circuit, alarm and electronic measurement technique.Vibration is detected as with automatic detection circuit
Example illustrates the use of window voltage comparator, for example, when the time of vibration course of a certain specified point can be displacement
Between course, which is the time history around basicly stable upper and lower displacement, and surrounds the basicly stable upper and lower displacement
Amplitude do not exceed ± Δ X, that is to say, that the vibration of the specified point is carried out in certain window, to this kind of non-electrical
During physical quantity is converted into electric signal by sensor, it is necessary to which window voltage comparison circuit picks up the electricity of vibration displacement
Signal.
Existing window voltage comparison circuit is a kind of double-limit comparator, mainly uses twin voltage comparator and two current potentials
Device provides comparative level, wherein the adjusting of the window's position and window size is all to pass through potentiometer in window voltage comparison circuit
Voltage is adjusted to complete, this kind of window voltage comparison circuit is suitable for the window's position and the fixed comparison circuit of window size.But
It is, still by taking automatic detection circuit as an example, for example, since vibration monitoring is shaking from some specified point to another specified point
Dynamic detection, when the specified point difference of detection, the amplitude of basicly stable point and basicly stable point may all change, also
It is to say, the window's position and window size can change in automatic detection process；And existing window voltage comparison circuit
In the window's position and window size can not follow the variation of detected signal and change, this can seriously reduce circuit comparison
Precision.Thus, existing window voltage comparison circuit has that the window's position and window size cannot automatically adjust.
Utility model content
In view of the above-mentioned problems, the window's position and window size can in a kind of window voltage comparison circuit of the utility model
It follows the transformation of the voltage to be compared of input and changes automatically, can effectively adjust the window's position and window of window voltage comparator circuit
Mouth size realizes that the tracking for treating comparison voltage is compared.
It is first input end, second defeated in order to solve the above technical problems, a kind of window voltage comparison circuit of the utility model
Enter end, third input terminal, the first operational amplifier, second operational amplifier, the first photoelectrical coupler, the second photoelectrical coupler and
Signal output end；Wherein,
The first input end is connected to the inverting input of the first operational amplifier by first resistor, and described second is defeated
Enter the inverting input that end is connected to first operational amplifier by second resistance, wherein the first input end is used for
Voltage to be compared is inputted, second input terminal is used for input window position control signal, and the window's position control signal is used
To determine the position of window center line；The in-phase input end of first operational amplifier is grounded, first operational amplifier
Inverting input and the inverting input of the second operational amplifier between pass through 3rd resistor and the 4th resistance and connect, institute
It states and is connected with the one or two between 3rd resistor and the tie point and the output end of first operational amplifier of the 4th resistance
Pole pipe is connected with the second diode between the output end and its inverting input of first operational amplifier；
The first input end connects the inverting input of the second operational amplifier by the 5th resistance, and described second
Input terminal is connected to the inverting input of the second operational amplifier by the 6th resistance, and the third input terminal passes through the 7th
Resistance connects the inverting input of the second operational amplifier, and the third input terminal is for input window width control letter
Number, the window width control signal is used for controlling the width of window；The in-phase input end of the second operational amplifier is grounded,
The inverting input of the second operational amplifier passes through light emitting diode in the 8th resistance and first photoelectrical coupler
The cathode of light emitting diode is connected in anode and second photoelectrical coupler, the output end of the second operational amplifier
Respectively with light emitting diode in the cathode of light emitting diode in first photoelectrical coupler and second photoelectrical coupler
Anode is connected；
Phototriode in the collector and the second photoelectrical coupler of phototriode in first photoelectrical coupler
Emitter connects and by the 9th resistance eutral grounding, and the emitter connection first of phototriode is straight in first photoelectrical coupler
Galvanic electricity source；
The collector of phototriode connects the second DC power supply in second photoelectrical coupler；
Collector and second photoelectricity of the signal output end with phototriode in first photoelectrical coupler
The emitter of phototriode is connected in coupler, to export comparison result.
Compared with prior art, the window voltage comparison circuit of the utility model waits comparing by what first input end inputted
Positive and negative compared with sum that the window's position that voltage and the second input terminal input controls signal determines the trip point of signal output end,
So that the trip point of signal output end changes automatically with the size of voltage to be compared, improves the determination precision height of trip point and ring
Answer speed；Meanwhile the window voltage comparison circuit of the utility model is formed by window center point position in window voltage and passes through
The window's position of second input terminal input controls Signal Regulation, and window width is controlled by the window width that third input terminal inputs
Signal Regulation so that the regulative mode of window voltage is simple, conveniently, it is sensitive；In addition, the window voltage of the utility model is more electric
Road is made using simple components such as operational amplifier, diode and resistance, and manufacturing cost is low.
As the improvement of said program, the resistance value of the first resistor is equal with the resistance value of the second resistance.
As the improvement of said program, the resistance value of the 5th resistance, the 6th resistance and the 7th resistance is equal
It is equal with the resistance value of the first resistor.
As the improvement of said program, the resistance value of the 3rd resistor is the 1/2 of the resistance value of the first resistor.
As the improvement of said program, the resistance value of the 4th resistance is the 1/4 of the resistance value of the first resistor.
As the improvement of said program, first DC power supply is direct voltage source, for providing negative voltage；Described
Two DC power supplies are direct voltage source, for providing positive voltage.
Description of the drawings
Fig. 1 is a kind of structural schematic diagram of window voltage comparison circuit of the utility model embodiment 1.
Fig. 2 is the voltage-transfer characteristic schematic diagram of window voltage comparison circuit in the utility model embodiment 1.
Specific implementation mode
Many details are elaborated in the following description in order to fully understand the utility model.But this practicality is new
Type can be much to implement different from the other modes of this description, and those skilled in the art can be without prejudice to the utility model
Similar popularization is done in the case of intension, therefore the utility model is not limited by following public specific embodiment.
Clear, complete description is carried out to the technical solution of the utility model with reference to specific embodiments and the drawings.
Embodiment 1
As shown in Figure 1, being a kind of structural schematic diagram of window voltage comparison circuit of the utility model embodiment 1.
The window voltage comparison circuit includes：First input end, the second input terminal, third input terminal, the first operation amplifier
Device A1, second operational amplifier A2, the first photoelectrical coupler OC1With the second photoelectrical coupler OC2；Wherein, first input end passes through
First resistor R2Connect the first operational amplifier A1Inverting input, the second input terminal passes through second resistance R2The first fortune of connection
Calculate amplifier A1Inverting input, wherein first input end is for inputting voltage V to be comparedIN, the second input terminal is for inputting
The window's position controls signal VK, the window's position control signal VKFor determining the position of window center line, the first operational amplifier
A1In-phase input end ground connection, the first operational amplifier A1Inverting input and second operational amplifier A2Inverting input
Pass through 3rd resistor R3With the 4th resistance R4Connection, 3rd resistor R3With the 4th resistance R4Tie point and the first operational amplifier A1
Output end between be connected with the first diode D1, the first operational amplifier A1Output end and its inverting input between connect
There is the second diode D2；First input end passes through the 5th resistance R5Connect second operational amplifier A2Inverting input, second is defeated
Enter end and passes through the 6th resistance R6Connect second operational amplifier A2Inverting input, third input terminal passes through the 7th resistance R7Even
Meet second operational amplifier A2Inverting input, third input terminal is used for input window width control signal Δ V, and the window is wide
Degree control signal is used for controlling the width of window, second operational amplifier A2In-phase input end ground connection, second operational amplifier A2
Inverting input pass through the 8th resistance R8With the first photoelectrical coupler OC1Middle light emitting diode D3Anode and the second photoelectricity coupling
Clutch OC2Middle light emitting diode D4Cathode be connected, second operational amplifier A2Output end respectively with the first photoelectrical coupler
OC1Middle light emitting diode D3Cathode and the second photoelectrical coupler OC2Middle light emitting diode D4Anode be connected；First photoelectricity
Coupler OC1Middle phototriode T1Collector and the second photoelectrical coupler OC2Middle phototriode T2Emitter connection simultaneously
Pass through the 9th resistance R9Ground connection, the first photoelectrical coupler OC1Middle phototriode T1Emitter connect the first DC power supply；The
Two photoelectrical coupler OC2Middle phototriode T2Collector connect the second DC power supply, wherein the first DC power supply be direct current
Voltage source, for providing negative voltage；Second DC power supply is direct voltage source, for providing positive voltage, signal output end VOUTWith
First photoelectrical coupler OC1Middle phototriode D3Collector and the second photoelectrical coupler OC2Middle phototriode D4Transmitting
Pole is connected, to export comparison result；R1=R2=R5=R6=R7=R, R3=R/2, R4=R/4, R are preset resistance value.
Next, being carried out to the operation principle of the window voltage comparison circuit in embodiment 1 in conjunction with attached drawing 1 and attached drawing 2 detailed
It describes in detail bright.
Due to R1=R2=R and the first operational amplifier A1In-phase input end ground connection, thus when input VINAnd VKMeet
(VIN+VK)<When 0, then the first operational amplifier A1The voltage V of the input of inverting inputG1<0, i.e. the first operational amplifier A1's
Inverting input inputs negative voltage, and then the negative voltage is passing through the first operational amplifier A1After reverse phase, the first operational amplifier A1
Output end instantaneously export positive voltage so that the second diode D2Conducting, the first diode D1Cut-off, at this point, 3rd resistor R3With
4th resistance R4Series connection, and it is connected to the first operational amplifier A1Virtual earth point G1With second operational amplifier A2Virtual earth point G2
Between, and the first operational amplifier A1Virtual earth point G1Voltage VG1≈ 0V, thus the first operational amplifier A1The voltage of virtual earth point
VG1To second operational amplifier A2It does not influence, second operational amplifier A2Only by VIN、VKWith the work of tri- input voltages of Δ V
With.Also, due to second operational amplifier A2Virtual earth point G2Voltage VG2≈ 0V, R5=R6=R7=R then flow through the 8th electricity
Hinder R8Electric current IOMeet the following conditions：
As (VIN+VK+ΔV)>When 0, IO>0, then the first photoelectrical coupler OC1Middle light emitting diode D3Conducting, the first photoelectricity
Coupler OC1Middle phototriode T1By light emitting diode D3It sends out illumination and is connected, the second photoelectrical coupler OC2In shine two
Pole pipe D4Cut-off, the second photoelectrical coupler OC2Middle phototriode T2It is not affected by light and ends, then signal output end VOUTOutput electricity
Pressure is the voltage-E, i.e. V of the first DC power supplyOUT=-E；As (VIN+VK+ΔV)<When 0, IO<0, then the first photoelectrical coupler OC1
Middle light emitting diode D3Cut-off, phototriode T1Not by light emitting diode D3It sends out illumination and ends, the second photoelectrical coupler
OC2In light emitting diode D4Conducting, phototriode T2It is illuminated by the light and is connected, then signal output end VOUTOutput voltage is second
Voltage+the E of DC power supply, i.e. VOUT=+E；As (VIN+VK+ Δ V)=0 when, IO=0, it is concluded that low value comparison point voltage VIN=-
VK-ΔV。
Due to R1=R2=R, R3=R/2 and the first operational amplifier A1In-phase input end ground connection, thus when input VIN
And VKMeet (VIN+VK)>When 0, then the first operational amplifier A1The voltage V of the input of inverting inputG1>0, i.e. the first operation is put
Big device A1Inverting input input positive voltage, and then the negative voltage pass through the first operational amplifier A1After reverse phase, the first operation
Amplifier A1Output end instantaneously export negative voltage so that the first diode D1Conducting, the second diode D2Cut-off, at this point, first
Operational amplifier A1With first resistor R1, second resistance R2With 3rd resistor R3Constitute reverse phase adder operation circuit, 3rd resistor R3
With the 4th circuit R4Voltage V at tie pointE=-(VIN+VK)/2, second operational amplifier A2By VIN、VK, Δ V and VEFour defeated
Enter the effect of voltage.Also, due to second operational amplifier A2Virtual earth point G2Voltage VG2≈0V、R5=R6=R7=R, then
Flow through the 8th resistance R8Electric current IOMeet the following conditions：
As (- VIN-VK+ΔV)>When 0, IO>0, then the first photoelectrical coupler OC1Middle light emitting diode D3Conducting, photosensitive three pole
Pipe T1By light emitting diode D3It sends out illumination and is connected, the second photoelectrical coupler OC2Middle light emitting diode D4Cut-off, photosensitive two pole
Pipe T2It is not affected by light and ends, then signal output end VOUTOutput voltage is the voltage-E, i.e. V of the first DC power supplyOUT=-E；When
(-VIN-VK+ΔV)<When 0, IO<0, then the first photoelectrical coupler OC1Middle light emitting diode D3Cut-off, photodiode T1It is not sent out
Optical diode D3It sends out illumination and ends, the second photoelectrical coupler OC2Middle light emitting diode D4Conducting, photodiode T2Light
According to and be connected, then signal output end VOUTOutput voltage is the voltage+E, i.e. V of the second DC power supplyOUT=+E；As (- VIN-VK+Δ
When V)=0, IO=0, it is concluded that high level comparison point voltage VIN=-VK+ΔV。
As shown in Fig. 2, being voltage-transfer characteristic schematic diagram in the window voltage comparison circuit.
The window width that the window voltage comparison circuit of the utility model is formed is 2 Δ V, and low value comparison point voltage is VIN
=-VKΔ V, high level comparison point voltage are VIN=-VK+ Δ V, window center point is-VK.Thus, when the second input terminal of adjustment
Input voltage VKSize when, so that it may to adjust the window center position that window voltage compares road, when adjustment third input terminal
When the voltage swing of input voltage Δ V, it will be able to which the width for adjusting window in window voltage comparison circuit can effectively solve the problem that biography
The window's position and the nonadjustable problem of window size in system window voltage comparison circuit, promotion judge precision, improve window voltage
The anti-film interference performance altogether of comparison circuit；In addition, the window voltage comparison circuit can also be according to outside window voltage comparison circuit
The requirement for connecing logic circuit is patrolled using the first DC power supply and the second DC power supply with different voltages value with meeting difference
Collect demand of the circuit to Different Logic level.On the other hand, the window voltage comparison circuit of the utility model also has circuit
It is simple in structure, manufacturing cost is low.
The voltage V to be compared that the window voltage comparison circuit of the utility model is inputted by first input endINAnd second
The window's position control signal V of input terminal inputKAnd (VIN+VK) the positive and negative comparison to change window voltage comparison circuit it is electric
Pressure value so that the comparing voltage value of window voltage comparison circuit is with voltage V to be comparedINChange and change automatically；Wherein, when
(VIN+VK)<When 0, the low value comparison voltage of window voltage comparison circuit is VIN=-VKΔ V, and then in VIN>-VKWhen Δ V, window
The signal output end V of mouth voltage comparator circuitOUTExport the voltage-E of the first DC power supply；In VIN<-VKWhen Δ V, window voltage
The signal output end V of comparison circuitOUTExport the voltage+E of the second DC power supply.As (VIN+VK)>When 0, window voltage is more electric
The high level comparison voltage on road is VIN=-VK+ Δ V, and then in VIN<-VKWhen+Δ V, the signal output end of window voltage comparison circuit
VOUTExport the voltage-E of the first DC power supply；In VIN>-VKWhen+Δ V, the signal output end of window voltage comparison circuit exports
VOUTVoltage+the E of second DC power supply.
Preferably, in the window voltage comparison circuit of the utility model, first resistor R1, second resistance R2, 3rd resistor
R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8And the 9th resistance R9Essence can be used
The resistance more than one thousandth is spent, to improve the precision of window voltage comparison circuit.
Preferably, it can also be selected according to the conversion accuracy of operational amplifier in the window voltage comparison circuit of the utility model
Select that slew rate is high, adjustment time is small, the high operational amplifier low with output impedance of input impedance is as the first operational amplifier A1
Or second operational amplifier A2。
Preferably, threshold voltage can also be selected according to conversion accuracy in the window voltage comparison circuit of the utility model
Low high speed switch type diode is as the first diode D1With the second diode D2And the selectable delay time is smaller
Photoelectrical coupler is as the first photoelectrical coupler OC1With the second photoelectrical coupler OC2, to improve the response speed of circuit.
The above descriptions are merely preferred embodiments of the present invention, is not done in any form to the utility model
Limitation, therefore all contents without departing from technical solutions of the utility model, according to the technical essence of the utility model to implementing above
Any simple modification, equivalent change and modification that example is done, are still within the scope of the technical solutions of the present invention.
Claims (6)
1. a kind of window voltage comparison circuit, which is characterized in that including first input end, the second input terminal, third input terminal,
One operational amplifier, second operational amplifier, the first photoelectrical coupler, the second photoelectrical coupler and signal output end；Wherein,
The first input end is connected to the inverting input of the first operational amplifier, second input terminal by first resistor
The inverting input of first operational amplifier is connected to by second resistance, wherein the first input end is for inputting
Voltage to be compared, second input terminal are used for input window position control signal, and the window's position control signal is used for certainly
Determine the position of window center line；The in-phase input end of first operational amplifier is grounded, first operational amplifier it is anti-
It is connected by 3rd resistor and the 4th resistance between phase input terminal and the inverting input of the second operational amplifier, described the
It is connected with the first diode between three resistance and the tie point and the output end of first operational amplifier of the 4th resistance,
It is connected with the second diode between the output end and its inverting input of first operational amplifier；
The first input end connects the inverting input of the second operational amplifier, second input by the 5th resistance
End is connected to the inverting input of the second operational amplifier by the 6th resistance, and the third input terminal passes through the 7th resistance
The inverting input of the second operational amplifier is connected, the third input terminal is used for input window width control signal, institute
State the width that window width control signal is used for controlling window；The in-phase input end of the second operational amplifier is grounded, described
The anode that the inverting input of second operational amplifier passes through light emitting diode in the 8th resistance and first photoelectrical coupler
And the cathode of light emitting diode is connected in second photoelectrical coupler, the output end difference of the second operational amplifier
With the anode of light emitting diode in the cathode of light emitting diode in first photoelectrical coupler and second photoelectrical coupler
It is connected；
In first photoelectrical coupler in the collector and the second photoelectrical coupler of phototriode phototriode transmitting
Pole connects and by the 9th resistance eutral grounding, and the emitter of phototriode connects the first direct current in first photoelectrical coupler
Source；The collector of phototriode connects the second DC power supply in second photoelectrical coupler；
Collector and second photoelectric coupling of the signal output end with phototriode in first photoelectrical coupler
The emitter of phototriode is connected in device, to export comparison result.
2. window voltage comparison circuit as described in claim 1, which is characterized in that the resistance value of the first resistor with it is described
The resistance value of second resistance is equal.
3. window voltage comparison circuit as claimed in claim 2, which is characterized in that the 5th resistance, the 6th resistance
It is equal with the resistance value of the first resistor with the resistance value of the 7th resistance.
4. window voltage comparison circuit as claimed in claim 3, which is characterized in that the resistance value of the 3rd resistor is described
The 1/2 of the resistance value of first resistor.
5. window voltage comparison circuit as claimed in claim 3, which is characterized in that the resistance value of the 4th resistance is described
The 1/4 of the resistance value of first resistor.
6. such as window voltage comparison circuit according to any one of claims 1 to 5, which is characterized in that first direct current
Source is direct voltage source, for providing negative voltage；Second DC power supply is direct voltage source, for providing positive voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820343605.4U CN207910749U (en) | 2018-03-13 | 2018-03-13 | A kind of window voltage comparison circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820343605.4U CN207910749U (en) | 2018-03-13 | 2018-03-13 | A kind of window voltage comparison circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207910749U true CN207910749U (en) | 2018-09-25 |
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ID=63558145
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820343605.4U Expired - Fee Related CN207910749U (en) | 2018-03-13 | 2018-03-13 | A kind of window voltage comparison circuit |
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| CN (1) | CN207910749U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108649933A (en) * | 2018-03-13 | 2018-10-12 | 佛山科学技术学院 | A kind of window voltage comparison circuit |
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2018
- 2018-03-13 CN CN201820343605.4U patent/CN207910749U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108649933A (en) * | 2018-03-13 | 2018-10-12 | 佛山科学技术学院 | A kind of window voltage comparison circuit |
| CN108649933B (en) * | 2018-03-13 | 2023-12-15 | 佛山科学技术学院 | Window voltage comparison circuit |
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Granted publication date: 20180925 Termination date: 20210313 |