CN206533352U - A kind of voltage is to time converting circuit - Google Patents
A kind of voltage is to time converting circuit Download PDFInfo
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- CN206533352U CN206533352U CN201720246589.2U CN201720246589U CN206533352U CN 206533352 U CN206533352 U CN 206533352U CN 201720246589 U CN201720246589 U CN 201720246589U CN 206533352 U CN206533352 U CN 206533352U
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- operational amplifier
- voltage
- phase
- select
- control circuit
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Abstract
A kind of voltage is to time converting circuit, it is characterised in that select an ON-OFF control circuit including square wave generation circuit, anti-phase integrator, voltage follower, voltage comparator, four.The utility model compared with the prior art, with larger change range of input voltage voltage changed to the time and keep good linear characteristic, voltage can be improved to time conversion accuracy, the advantage of conversion time is reduced.
Description
Technical field
The utility model is related to a kind of signaling conversion circuit.
Background technology
Control occasion in industrial production, the processing of many products and assembling technology procedure need to carry out product or equipment with
Track and positioning signal, but tracked object is often limited the place that control signal is obtained away from console by structure and environment
Distance controller is distant, or control target is distant from processor, is at this moment accomplished by carrying out signal transmission.Voltage signal
It is vulnerable to interference during transmission, is typically converted into time signal to transmit, improves system rejection to disturbance ability.This
Outside, developing rapidly with computer technology and large scale integrated circuit technology, analog to digital conversion circuit technology is also constantly being entered
Step and development, the time are more easily implemented to numeral conversion, are easy to the subsequent treatment to control signal.
Voltage is the circuit for voltage signal being converted to time signal to time converter, and the circuit needs good essence
The characteristics of degree and linearly defeated people, traditionally mainly there are two kinds of measuring methods, one kind is to use and digital voltmeter principle identical
Double integrator switch technology, if voltage conversion into time be change-over circuit working pulse N number of cycle, during required conversion
Between be greater than 2N cycle of working pulse, the bigger conversion accuracy of the voltage signal changed requires higher, and conversion time is got over
Long, this significantly limit the switching rate of circuit, and for the voltage signal of small-signal, the dynamic response of circuit resists
Interference performance is poor, it is impossible to accurately realize voltage to the conversion of time.Another voltage is to time converting circuit
Based on charge balance concept, the time pulse signal being directly proportional to input voltage signal is produced, because charge balancing circuit is used
Be positive and negative both direction integration balancing circuitry, the non-linear of the integrating circuit can not be eliminated, and especially small-signal is influenceed to compare
Larger, input voltage signal needs to be converted into current signal to be compared again in addition, so to the performance requirement of comparator significantly
Improve, in order to reduce the imbalance of comparator, its prime needs power amplifier to be driven, this can to circuit bring bigger power consumption and
Complexity.
Utility model content
Goal of the invention of the present utility model is to provide a kind of voltage in larger change range of input voltage to the time turn
Change and keep good linear characteristic, voltage can be improved to time conversion accuracy, reduce the voltage of conversion time and change to the time
Circuit.
The utility model be achieved in that including square-wave signal, anti-phase integrator, voltage follower, voltage ratio compared with
Device, four select an ON-OFF control circuit, and anti-phase integrator includes resistance R1, operational amplifier A1, electric capacity C, resistance R1One end with
Square-wave signal UfIt is connected, resistance R1The other end and operational amplifier A1End of oppisite phase be connected, operational amplifier A1End of oppisite phase lead to
Cross electric capacity C and operational amplifier A1Output end U01It is connected, operational amplifier A1In-phase end ground connection, voltage follower include fortune
Calculate amplifier A2, operational amplifier A5, the resistance R after series connection2、R3One end and power supply U+It is connected, the resistance R after series connection2、R3's
The other end and operational amplifier A1Output end be connected, operational amplifier A2In-phase end connection resistance R after concatenation2、R3It
Between, R here2=R3, operational amplifier A2End of oppisite phase and operational amplifier A2Output end U02It is connected, operational amplifier A5It is same
Phase end selects the output end of an ON-OFF control circuit to be connected with four, operational amplifier A5End of oppisite phase and operational amplifier A5Output
End is connected, operational amplifier A5Output end be output as time width with by conversion voltage UiThe pulse voltage signal U being directly proportional0,
Voltage comparator includes operational amplifier A3, operational amplifier A4, operational amplifier A3End of oppisite phase with it is defeated by conversion voltage signal
Enter UiIt is connected, operational amplifier A3In-phase end and operational amplifier A2Output end U02It is connected, operational amplifier A4End of oppisite phase
With operational amplifier A2Output end U02It is connected, operational amplifier A4In-phase end ground connection, four select the two of an ON-OFF control circuit
Logic gate control signal input A, B respectively with operational amplifier A3Output end U03And operational amplifier A3Output end U04
It is connected, four select wherein the one of an ON-OFF control circuit to switch input is connected with constant voltage U, and four select the another of an ON-OFF control circuit
Three switch input groundings, four select the four-way switch of an ON-OFF control circuit to input gates through two logic gate control signal A, B
All the way as four outputs for selecting an ON-OFF control circuit, four to select the switching gate of a switching logic gate control circuit be such reality
It is existing, when two logic gate control signal input A, B are low level, four select an ON-OFF control circuit output gate with
The wherein one switch closure that constant positive voltage U is connected, when two signal input part A, B are not all low level, four select a switch control
A closure in the output of the circuit processed the other three switch that gating and ground connection are connected respectively, wherein U+/2>Ui。
During work, with certain repetition period(Such as 100ms)Square-wave signal UfThe input of anti-phase integrator is added to,
As the signal U being integratedfLow level, i.e. UfDuring=0V, integrator output UO1It is zero, UO1Through R2、R3The voltage increase constituted with U
Circuit boosts and operational amplifier A2The voltage follower of composition is isolated, UO2=U+/ 2, due to U+/2>Ui>0, and UO2=
U+/ 2 are added to voltage comparator A simultaneously3In-phase end and voltage comparator A4End of oppisite phase, voltage comparator A3Export high level,
This level is added to four and selects the logic of an ON-OFF control circuit to gate control bit A, i.e. A=1, voltage comparator A4Export low level,
This level is added to four when selecting the logic of an ON-OFF control circuit to gate control bit B, i.e. B=0, A=1, B=0 and four selects a switch to control
The output gating and GND of circuit(For ground connection symbol, its current potential represented is zero)Connection, through operational amplifier A5The voltage of composition
Follower carries out isolation and amplifier, and it exports Uo=0V。
As the signal U being integratedfIt is high level, such as UfDuring=+ 5V, integrator output UO1It is that an initial value is zero and oblique
Rate is the straight line of negative value.Integrator exports UO1Through R2、R3And U+The voltage lifting circuit boosting of composition and operational amplifier A2Constitute
Voltage follower isolated, the output of integrator is increased by U+/ 2, i.e. UO2It is U for initial value+/ 2 slopes are straight for what is born
Line.Decline when integrator is exported, UO2Also decline therewith.Work as UO2>Ui>When 0, whole circuit keeps the signal U being integratedfIt is low electricity
It is flat, i.e. UfState during=0V;When dropping to UO2≤UiWhen, voltage comparator A3Low level, A=0, voltage are turned to by high level
Comparator A4State is constant, and four select the output of an ON-OFF control circuit to gate to be connected with constant positive voltage U during B=0, A=0, B=0,
Through operational amplifier A5The voltage follower of composition carries out isolation and amplifier, and it exports UoFor constant positive voltage U;When dropping to UO2≤
During 0V, voltage comparator A4High level, B=1, voltage comparator A are turned to by low level3State is constant, now four when A=0, B=1
The output of an ON-OFF control circuit is selected to gate and GND(For ground connection symbol, its current potential represented is zero)Connection, through operational amplifier
A5The voltage follower of composition carries out isolation and amplifier, and it exports Uo=0V.Obviously in 0≤UO2≤UiPeriod, A=0, B=0, computing is put
Big device A5Output keeps UoFor constant positive voltage U, the time of holding is T, due to T and UiAnd the straight line of integration output is constituted directly
Angle triangular relationship, so T=kUi, k is constant coefficient, that is, works as UiWhen being the voltage change changed, operational amplifier A5Output electricity
Press UoWidth T also proportionally change therewith, that is, realize voltage to the conversion of time.
The utility model compared with the prior art, due to using anti-phase integrator, voltage follower, voltage comparator,
Four select ON-OFF control circuit etc., directly using voltage ratio compared with, it is to avoid double integrator conversion or voltage are to electric current in traditional scheme
Conversion after the method that compares again, realize that in larger change range of input voltage voltage is changed to the time and keep good linear
Characteristic, improves voltage to time conversion accuracy, reduces conversion time.Therefore, it is simple and reliable with circuit, antijamming capability
By force, the facultative strong advantage small suitable for the main logic circuits such as TTL, COMS, dynamic power loss of circuit digital.
Brief description of the drawings
Fig. 1 is circuit diagram of the present utility model;
Fig. 2 is the oscillogram that voltage is changed to the time.
Embodiment
The utility model is described in further detail in conjunction with drawings and examples:
As shown in figure 1, the utility model includes square-wave signal Uf, anti-phase integrator 1, voltage follower 2, voltage ratio compared with
Device 3, four selects an ON-OFF control circuit 4, and anti-phase integrator 1 includes resistance R1, operational amplifier A1, electric capacity C, resistance R1One
End and square-wave signal UfIt is connected, square-wave signal UfIt is 100ms the repetition periods to be, voltage is+5V square wave, resistance R1The other end
With operational amplifier A1End of oppisite phase be connected, operational amplifier A1End of oppisite phase pass through electric capacity C and operational amplifier A1Output end
U01It is connected, operational amplifier A1In-phase end ground connection, voltage follower 2 include operational amplifier A2, operational amplifier A5, series connection
Resistance R afterwards2、R3One end and power supply U+It is connected, the resistance R after series connection2、R3The other end and operational amplifier A1Output end
It is connected, operational amplifier A2In-phase end connection resistance R after concatenation2、R3Between, R here2=R3, operational amplifier A2It is anti-
Phase end and operational amplifier A2Output end U02It is connected, operational amplifier A5In-phase end and four select an ON-OFF control circuit 4
Output end is connected, operational amplifier A5End of oppisite phase and operational amplifier A5Output end be connected, operational amplifier A5Output end
It is output as time width and by conversion voltage UiThe pulse voltage signal U being directly proportional0, voltage comparator 3 include operational amplifier
A3, operational amplifier A4, operational amplifier A3End of oppisite phase with by conversion voltage signal input UiIt is connected, operational amplifier A3It is same
Phase end and operational amplifier A2Output end U02It is connected, operational amplifier A4End of oppisite phase and operational amplifier A2Output end U02
It is connected, operational amplifier A4In-phase end ground connection, the four two logic gate control signal input A for selecting an ON-OFF control circuit 4,
B respectively with operational amplifier A3Output end U03And operational amplifier A3Output end U04It is connected, four select an ON-OFF control circuit 4
Wherein one switch input be connected with constant voltage U, four select an ON-OFF control circuit 4 the other three switch input grounding, four select
The four-way switch input of one ON-OFF control circuit 4 selects a switch control as four all the way through two logic gate control signal A, B gatings
The output of circuit 4 processed, four, which select the switching gate of a switching logic gate control circuit to be achieved in that, works as the gating control of two logics
When signal input part A, B processed are low level, four select the output of an ON-OFF control circuit 4 to gate what is be connected with constant positive voltage U
Wherein one switch closure, when two signal input part A, B are not all low level(That is A=1, B=0;A=1、B=1;A=0、B=1)When, four
Select a closure in the output the other three switch that gating and ground connection are connected respectively of an ON-OFF control circuit 4, wherein U+/2>Ui。
During work, square-wave signal UfThe input of anti-phase integrator 1 is added to, as the signal U being integratedfIt is low level,
That is UfDuring=0V, integrator output UO1It is zero, UO1Through R2、R3The voltage lifting circuit boosting constituted with U and operational amplifier A2Structure
Into voltage follower 2 isolated, UO2=U+/ 2, due to U+/2>Ui>0, and UO2=U+/ 2 are added to voltage comparator A simultaneously3
In-phase end and voltage comparator A4End of oppisite phase, voltage comparator A3High level is exported, this level is added to four and selects a switch control
Logic gating control bit A, i.e. A=1 of circuit 4 processed, voltage comparator A4Low level is exported, this level is added to four and selects a switch
Four select the output of an ON-OFF control circuit to gate and GND when logic gating control bit B, i.e. B=0, A=1 of control circuit 4, B=0
(For ground connection symbol, its current potential represented is zero)Connection, through operational amplifier A5It is defeated that the voltage follower 2 of composition carries out isolation
Go out, it exports Uo=0V。
As shown in Fig. 2 as the signal U being integratedfWhen being high level+5V, integrator output UO1It is that an initial value is zero
And slope is the straight line C of negative value (- 1/RC).Integrator exports UO1Through R2、R3And U+The voltage lifting circuit boosting of composition and fortune
Calculate amplifier A2The voltage follower 2 of composition is isolated, and the output of integrator is increased by U+/ 2, i.e. UO2It is U for initial value+/
2 slopes are the straight line D of negative value (- 1/RC).Decline when integrator is exported, UO2Also decline therewith.Work as UO2>Ui>When 0, whole circuit
Keep the signal U being integratedfLow level, i.e. UfState during=0V;When dropping to UO2≤UiWhen, voltage comparator A3By high electricity
It is flat to be turned to low level, A=0, voltage comparator A4State is constant, and four select the defeated of an ON-OFF control circuit 4 during B=0, A=0, B=0
Go out gating to be connected with constant positive voltage U, through operational amplifier A5The voltage follower 2 of composition carries out isolation and amplifier, and it exports UoFor
Constant positive voltage U;When dropping to UO2During≤0V, voltage comparator A4High level, B=1, voltage comparator are turned to by low level
A3State is constant, now four selects the output of an ON-OFF control circuit 4 to gate and GND when A=0, B=1(For ground connection symbol, it is represented
Current potential be zero)Connection, through operational amplifier A5The voltage follower 2 of composition carries out isolation and amplifier, and it exports Uo=0V.Obviously exist
0≤UO2≤UiPeriod, A=0, B=0, operational amplifier A5Output keeps UoFor constant positive voltage U=+ 3V, the time of holding is T, by
In T and UiAnd the straight line form right angle triangular relationship of integration output, so T=kUi, k is constant coefficient, that is, works as UiIt is to be changed
Voltage change when, operational amplifier A5Output voltage UoWidth T also proportionally change therewith, that is, realize voltage then
Between conversion.
Claims (1)
1. a kind of voltage is to time converting circuit, it is characterised in that including square-wave signal, anti-phase integrator, voltage follower,
Voltage comparator, four select an ON-OFF control circuit, and anti-phase integrator includes resistance R1, operational amplifier A1, electric capacity C, resistance R1
One end and square-wave signal UfIt is connected, resistance R1The other end and operational amplifier A1End of oppisite phase be connected, operational amplifier A1's
End of oppisite phase passes through electric capacity C and operational amplifier A1Output end U01It is connected, operational amplifier A1In-phase end ground connection, voltage follow
Device includes operational amplifier A2, operational amplifier A5, the resistance R after series connection2、R3One end and power supply U+It is connected, the electricity after series connection
Hinder R2、R3The other end and operational amplifier A1Output end be connected, operational amplifier A2In-phase end connection electricity after concatenation
Hinder R2、R3Between, R here2=R3, operational amplifier A2End of oppisite phase and operational amplifier A2Output end U02It is connected, operation amplifier
Device A5In-phase end select the output end of an ON-OFF control circuit to be connected with four, operational amplifier A5End of oppisite phase and operational amplifier
A5Output end be connected, operational amplifier A5Output end be output as time width with by conversion voltage UiThe pulse electricity being directly proportional
Press signal U0, voltage comparator include operational amplifier A3, operational amplifier A4, operational amplifier A3End of oppisite phase with being changed
Voltage signal inputs UiIt is connected, operational amplifier A3In-phase end and operational amplifier A2Output end U02It is connected, operational amplifier
A4End of oppisite phase and operational amplifier A2Output end U02It is connected, operational amplifier A4In-phase end ground connection, four select a switch control
Two logic gate control signal input A, B of circuit respectively with operational amplifier A3Output end U03And operational amplifier A3's
Output end U04It is connected, four select wherein the one of an ON-OFF control circuit to switch input is connected with constant voltage U, and four select a switch to control
The other three switch input grounding of circuit, four select the four-way switch of an ON-OFF control circuit to input through two logic gate control signals
A, B are gated all the way as four outputs for selecting an ON-OFF control circuit, and four select the switching gate of a switching logic gate control circuit
It is achieved in that four select the defeated of an ON-OFF control circuit when two logic gate control signal input A, B are low level
Go out the wherein one switch closure that gating is connected with constant positive voltage U, when two signal input part A, B are not all low level, four choosings
A closure in the output of the one ON-OFF control circuit the other three switch that gating and ground connection are connected respectively, wherein U+/2>Ui。
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CN201720246589.2U CN206533352U (en) | 2017-03-14 | 2017-03-14 | A kind of voltage is to time converting circuit |
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CN201720246589.2U CN206533352U (en) | 2017-03-14 | 2017-03-14 | A kind of voltage is to time converting circuit |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106788438A (en) * | 2017-03-14 | 2017-05-31 | 佛山科学技术学院 | A kind of voltage is to time converting circuit |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN106788438A (en) * | 2017-03-14 | 2017-05-31 | 佛山科学技术学院 | A kind of voltage is to time converting circuit |
CN106788438B (en) * | 2017-03-14 | 2023-05-05 | 佛山科学技术学院 | Voltage-to-time conversion circuit |
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CF01 | Termination of patent right due to non-payment of annual fee | ||
CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170929 Termination date: 20210314 |