CN107621842A - A kind of voltage follower circuit for improving voltage signal tracking accuracy - Google Patents
A kind of voltage follower circuit for improving voltage signal tracking accuracy Download PDFInfo
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- CN107621842A CN107621842A CN201610807634.7A CN201610807634A CN107621842A CN 107621842 A CN107621842 A CN 107621842A CN 201610807634 A CN201610807634 A CN 201610807634A CN 107621842 A CN107621842 A CN 107621842A
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Abstract
The invention discloses a kind of high-accuracy voltage to follow circuit,4th resistance,5th resistance,6th resistance,7th resistance,Second operational amplifier forms in-phase adder,Wherein the 4th resistance and the 6th resistance are equal,5th resistance and the 7th resistance are equal,So that analog input voltage is superimposed with analog ground potential,Voltage after superposition is relative to voltage swing of the analog ground voltage size still to input,First resistor forms low-pass first order filter with the first electric capacity,Play a part of filtering off clutter,Second resistance,3rd resistor,First operational amplifier forms the voltage follower relative to simulation ground,The gain size of this voltage follower circuit can be adjusted by adjusting the resistance of second resistance and 3rd resistor,The output end of this sample voltage follower circuit forms stable proportionate relationship with input,It will not be changed by external digital earth-return size of current and cause the floating of internal simulation earth potential to be influenceed,Improve the tracking accuracy of analog voltage signal.
Description
Technical field
The present invention is relevant with voltage follower circuit, and in particular to a kind of voltage follow for improving voltage signal tracking accuracy
Circuit.
Background technology
With developing rapidly for electronic technology, voltage follower circuit has been used widely, and voltage follower circuit is main
For requiring higher circuit to analog voltage signal.Because voltage follower circuit has, input impedance is high, and output impedance is low
The characteristics of so that it can complete the function of impedance matching in circuit, can avoid because output impedance is higher, and next stage
Loss of signal caused by input impedance is smaller, plays a part of forming a connecting link.As shown in figure 1, using integrated operational amplifier
Have become a simple, quick way of structure voltage-tracing with precision resistance composition voltage follower.
It is the currently used voltage follower circuit built by integrated operational amplifier shown in Fig. 1.Analog sensor is defeated
The analog voltage V_in gone out is after the low pass filter filtering being made up of R1 and C1, access integrated operational amplifier U1 positive
Input, output voltage V_out=V_in* (R2+R3)/R2, gain k=(R2+R3)/R2.Gathered in common analog voltage
In circuit, reference horizontal plane of manufacturing with being divided into the digitally Gnd of outside and internal simulation AGnd, then connected with Ferrite Material
Come.When digitally there is larger loop current in Gnd loops, internal simulation AGnd potentials will be elevated, be no longer 0,
Output voltage V_out will reduce therewith relative to simulation ground AGnd.It is clear that the shortcomings that this circuit is simulation ground AGnd electricity
Gesture can change with the digitally change of Gnd loop currents, have impact on the precision of this analog voltage tracking.
In universal analog voltage Acquisition Circuit, it will usually which the influence for the simulation ground AGnd potentials that this is lifted is neglected
Slightly disregard.But if it is expected further to improve the precision of analog voltage tracking, or voltage follower circuit is applied to small change
Change in voltage collection circuit, then need to consider the influence of analog ground potential.
The content of the invention
The purpose of the present invention is the deficiency for currently used voltage follower circuit, there is provided a kind of high-accuracy voltage follows
Circuit：By increasing operational amplifier in circuit, the influence that analog ground potential is floated is eliminated, improves voltage-tracing precision.This
Circuit structure is simple, low manufacture cost, and tracking accuracy is high, can be widely applied to the analog voltage collection with degree of precision requirement
In circuit.
This high-accuracy voltage follows circuit to include the first operational amplifier, the second operational amplifier, the first electric capacity, the first electricity
Resistance, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance and the 7th resistance.4th resistance one end connects number
Word, the other end connect the second operational amplifier inverting input, the 5th resistance one end connect the second operational amplifier it is same
Phase input, the other end be this circuit input, the 6th resistance both ends connect the second operational amplifier inverting input and
The output end of second operational amplifier, the 7th resistance one end connect in-phase input end, another termination mould of the second operational amplifier
Intend ground, first resistor both ends are connected to the output end of the second operational amplifier and the homophase input of the first operational amplifier
End, first electric capacity one end are connected to the tie point of first resistor and the first operational amplifier, another termination simulation ground, 3rd resistor
The inverting input of the first operational amplifier and the output end of the first operational amplifier are connected to, second resistance one end is connected to
The inverting input of one operational amplifier and the tie point of 3rd resistor, another termination simulation ground, the first operational amplifier it is defeated
Go out the output end that end is this circuit.
In technical scheme, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the second operational amplifier
In-phase adder is formed, wherein the 4th resistance and the 6th resistance is equal, the 5th resistance and the 7th resistance are equal so that
Analog input voltage is superimposed with analog ground potential, and the voltage after superposition is big relative to voltage of the analog ground voltage size still for input
Small, first resistor and the first electric capacity form low-pass first order filter, play a part of filtering off clutter, second resistance, 3rd resistor,
First operational amplifier forms the voltage follower relative to simulation ground, can be by adjusting the resistance of second resistance and 3rd resistor
Value adjusts the gain size of this voltage follower circuit, and output end and the input of this sample voltage follower circuit form stable
Proportionate relationship, will not be changed by external digital earth-return size of current and causing internal simulation earth potential to float is influenceed, carried
The high tracking accuracy of analog voltage signal.
It is an advantage of the invention that：
1st, superimposed signal circuit is built by operational amplifier etc. so that voltage signal is relative to simulation stable, improves
The tracking accuracy of voltage signal.
2nd, this circuit structure is simple, low manufacture cost, primary circuit is changed little, it is easy to accomplish.
Brief description of the drawings
Fig. 1 is currently used voltage follower circuit schematic diagram；
Fig. 2 is that high-accuracy voltage of the present invention follows circuit theory diagrams；
Embodiment
In the voltage follower circuit shown in Fig. 2, the 4th resistance R4 one end connection digitally Gnd, other end connection second
Operational amplifier U2 inverting input, the 5th resistance R5 one end connect the second operational amplifier U2 in-phase input end, another
The input V_in for this circuit is held, the 6th resistance R6 both ends connect the second operational amplifier U2 inverting input and the second fortune
Amplifier U2 output end is calculated, the 7th resistance R7 one end connects the second operational amplifier U2 in-phase input end and the 5th resistance R5
Tie point, it is another termination simulation ground AGnd, first resistor R1 both ends are connected to the second operational amplifier U2 output end
With the first operational amplifier U1 in-phase input end, first electric capacity C1 one end is connected to first resistor R1 and the first operational amplifier
U1 tie point, it is another termination simulation ground AGnd, 3rd resistor R3 be connected to the first operational amplifier U1 inverting input and
First operational amplifier U1 output end, second resistance R2 one end are connected to the first operational amplifier U1 inverting input and
Three resistance R3 tie point, another termination simulation ground AGnd, the first operational amplifier U1 output end is the output of this circuit
Hold V_out.
In technical scheme, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the second fortune
Calculate amplifier U2 and form in-phase adder, wherein R4=R6, R5=R7 so that simulation input potential UinWith simulation ground AGnd potentials
UAGndSuperposition, obtains the second operational amplifier output terminal potential Uout2=Uin+UAGnd, i.e. the second operational amplifier output terminal voltage
It is equal to V_in, first resistor R1 and the first electric capacity C1 relative to simulation ground AGnd voltage and forms low-pass first order filter, plays
The effect of clutter is filtered off, second resistance R2,3rd resistor R3, the first operational amplifier U1 form voltage follower, can passed through
Second resistance R2 and 3rd resistor R3 resistance is adjusted to adjust the gain size of this voltage follower circuit, i.e. K=(R2+R3)/
R2, output end (being referred to AGnd) and the input (being referred to Gnd) of this sample voltage follower circuit form stable ratio and closed
System, i.e. Uout-UAGnd=K* (Uin-UGnd), will not by external digital earth-return size of current change and with causing internal simulation
The influence that potential floats, the tracking accuracy of analog voltage signal is improved, and this circuit structure is simple, low manufacture cost, it is right
Primary circuit change is little, it is easy to accomplish, in the analog voltage signal Acquisition Circuit that can be widely applied to there is degree of precision requirement.
Claims (1)
1. a kind of high-accuracy voltage follows circuit, it is characterised in that：Including the first operational amplifier, the second operational amplifier,
One electric capacity, first resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance and the 7th resistance, the 4th electricity
Hinder one end connection digitally, the other end connect the second operational amplifier inverting input, the 5th resistance one end connection second fortune
Calculate the in-phase input end of amplifier, the input that the other end is this circuit, the 6th resistance both ends connect the second operational amplifier
The output end of inverting input and the second operational amplifier, the 7th resistance one end connect the homophase input of the second operational amplifier
End, another termination simulation ground, first resistor both ends are connected to the output end and the first operation amplifier of the second operational amplifier
The in-phase input end of device, first electric capacity one end are connected to the tie point of first resistor and the first operational amplifier, another termination mould
Intend ground, 3rd resistor is connected to the inverting input of the first operational amplifier and the output end of the first operational amplifier, the second electricity
Resistance one end is connected to the inverting input of the first operational amplifier and the tie point of 3rd resistor, another termination with simulating, and first
The output end of operational amplifier is the output end of this circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610807634.7A CN107621842B (en) | 2016-09-07 | 2016-09-07 | A kind of voltage follower circuit that voltage signal tracking accuracy can be improved |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610807634.7A CN107621842B (en) | 2016-09-07 | 2016-09-07 | A kind of voltage follower circuit that voltage signal tracking accuracy can be improved |
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| Publication Number | Publication Date |
|---|---|
| CN107621842A true CN107621842A (en) | 2018-01-23 |
| CN107621842B CN107621842B (en) | 2019-01-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610807634.7A Active CN107621842B (en) | 2016-09-07 | 2016-09-07 | A kind of voltage follower circuit that voltage signal tracking accuracy can be improved |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109459600A (en) * | 2018-12-25 | 2019-03-12 | 北京华峰测控技术股份有限公司 | A kind of floating wide-range voltage measuring circuit |
| CN109669104A (en) * | 2019-01-29 | 2019-04-23 | 镇江赛尔尼柯自动化有限公司 | A kind of method and its monitoring device based on Injection Signal monitoring ship network system Intelligent insulation state |
| CN111308178A (en) * | 2020-03-19 | 2020-06-19 | 苏州挚途科技有限公司 | Phase current sampling device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5041795A (en) * | 1990-04-27 | 1991-08-20 | Analog Devices, Inc. | Three-terminal operational amplifier and applications thereof |
| CN203672964U (en) * | 2014-01-24 | 2014-06-25 | 镇江天力变压器有限公司 | Integrating circuit of high-frequency dedusting power supply resonance current |
| CN204144923U (en) * | 2014-09-01 | 2015-02-04 | 江苏方程电力科技有限公司 | A kind of high-power IGBT temperature sampling protective circuit |
| CN104850164A (en) * | 2015-05-29 | 2015-08-19 | 成都瑞联电气股份有限公司 | Circuit composed of three operational amplifiers and capable of outputting four types of analog signals in configurable manner |
| CN105356879A (en) * | 2015-09-29 | 2016-02-24 | 北京航天长征飞行器研究所 | Signal conditioning circuit for acceleration sensor with high g value |
-
2016
- 2016-09-07 CN CN201610807634.7A patent/CN107621842B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5041795A (en) * | 1990-04-27 | 1991-08-20 | Analog Devices, Inc. | Three-terminal operational amplifier and applications thereof |
| CN203672964U (en) * | 2014-01-24 | 2014-06-25 | 镇江天力变压器有限公司 | Integrating circuit of high-frequency dedusting power supply resonance current |
| CN204144923U (en) * | 2014-09-01 | 2015-02-04 | 江苏方程电力科技有限公司 | A kind of high-power IGBT temperature sampling protective circuit |
| CN104850164A (en) * | 2015-05-29 | 2015-08-19 | 成都瑞联电气股份有限公司 | Circuit composed of three operational amplifiers and capable of outputting four types of analog signals in configurable manner |
| CN105356879A (en) * | 2015-09-29 | 2016-02-24 | 北京航天长征飞行器研究所 | Signal conditioning circuit for acceleration sensor with high g value |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109459600A (en) * | 2018-12-25 | 2019-03-12 | 北京华峰测控技术股份有限公司 | A kind of floating wide-range voltage measuring circuit |
| CN109459600B (en) * | 2018-12-25 | 2024-04-30 | 北京华峰测控技术股份有限公司 | Floating wide-range voltage measurement circuit |
| CN109669104A (en) * | 2019-01-29 | 2019-04-23 | 镇江赛尔尼柯自动化有限公司 | A kind of method and its monitoring device based on Injection Signal monitoring ship network system Intelligent insulation state |
| CN109669104B (en) * | 2019-01-29 | 2021-12-14 | 镇江赛尔尼柯自动化有限公司 | Method and device for monitoring intelligent insulation state of ship power grid system based on injection signal |
| CN111308178A (en) * | 2020-03-19 | 2020-06-19 | 苏州挚途科技有限公司 | Phase current sampling device |
Also Published As
| Publication number | Publication date |
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| CN107621842B (en) | 2019-01-25 |
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