CN206533352U - A kind of voltage is to time converting circuit - Google Patents

A kind of voltage is to time converting circuit Download PDF

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Publication number
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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CN
China
Prior art keywords
operational amplifier
voltage
phase
select
control circuit
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Expired - Fee Related
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CN201720246589.2U
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Chinese (zh)
Inventor
杨波
朱珍
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Foshan University
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Foshan University
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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

A kind of voltage is to time converting circuit
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
CN201720246589.2U 2017-03-14 2017-03-14 A kind of voltage is to time converting circuit Expired - Fee Related CN206533352U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
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

Cited By (2)

* Cited by examiner, † Cited by third party
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
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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Granted publication date: 20170929

Termination date: 20210314