CN107621842B - A kind of voltage follower circuit that voltage signal tracking accuracy can be improved - Google Patents
A kind of voltage follower circuit that voltage signal tracking accuracy can be improved Download PDFInfo
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- CN107621842B CN107621842B CN201610807634.7A CN201610807634A CN107621842B CN 107621842 B CN107621842 B CN 107621842B CN 201610807634 A CN201610807634 A CN 201610807634A CN 107621842 B CN107621842 B CN 107621842B
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Abstract
The invention discloses a kind of high-accuracy voltages to follow circuit, 4th resistance, 5th resistance, 6th resistance, 7th resistance, second operational amplifier constitutes 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, superimposed voltage is still the voltage swing inputted relative to analog ground voltage size, first resistor and first capacitor constitute low-pass first order filter, play the role of filtering off clutter, second resistance, 3rd resistor, first operational amplifier constitutes the voltage follower relative to simulation ground, the gain size of this voltage follower circuit can be adjusted by adjusting the resistance value of second resistance and 3rd resistor, the output end and input terminal of this sample voltage follower circuit constitute stable proportionate relationship, it not will receive external digital Earth-return size of current changes and causes the influence of internal simulation earth potential floating, improves the tracking accuracy of analog voltage signal.
Description
Technical field
The present invention is related with voltage follower circuit, and in particular to a kind of voltage follow that voltage signal tracking accuracy can be improved
Circuit.
Background technique
With the rapid development of electronic technology, voltage follower circuit has been used widely, and voltage follower circuit is main
For the circuit more demanding to analog voltage signal.Since voltage follower circuit has input impedance height, and output impedance is low
The characteristics of so that it can complete the function of impedance matching in circuit, can to avoid due to output impedance it is higher, and next stage
The loss of signal generated when input impedance is smaller plays the role of forming a connecting link.As shown in Figure 1, using integrated operational amplifier
The simple, quick way that voltage follower has become building voltage-tracing is constituted with precision resistance.
It is the currently used voltage follower circuit constructed by integrated operational amplifier shown in Fig. 1.Analog sensor is defeated
Analog voltage V_in out accesses the positive of integrated operational amplifier U1 after the low-pass filter filtering being made of R1 and C1
Input terminal, output voltage V_out=V_in* (R2+R3)/R2, gain k=(R2+R3)/R2.It is acquired in common analog voltage
In circuit, reference horizontal plane of manufacturing is divided into external digitally Gnd with internal simulation AGnd, then is connected with Ferrite Material
Come.When digitally there is biggish loop current in the circuit Gnd, internal simulation AGnd potential will be elevated, be no longer 0,
Output voltage V_out will reduce therewith relative to simulation ground AGnd.It is clear that the disadvantage of this circuit is that simulation ground AGnd electricity
Gesture can change with the digitally variation of Gnd loop current, affect the precision of this analog voltage tracking.
In universal analog voltage Acquisition Circuit, it will usually neglect the influence of this simulation ground AGnd potential being lifted
Slightly disregard.But if expectation further increases the precision of analog voltage tracking, or voltage follower circuit is applied to small change
Change in voltage collection circuit, then needs to consider the influence of analog ground potential.
Summary of the invention
The purpose of the present invention is being directed to the deficiency of currently used voltage follower circuit, a kind of high-accuracy voltage is provided and is followed
Circuit: by increasing operational amplifier in circuit, the influence that analog ground potential is floated is eliminated, voltage-tracing precision is improved.This
Circuit structure is simple, low manufacture cost, and tracking accuracy is high, can be widely applied to the analog voltage that there is degree of precision to require acquisition
In circuit.
It includes the first operational amplifier, second operational amplifier, first capacitor, the first electricity that this high-accuracy voltage, which follows circuit,
Resistance, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance and the 7th resistance.4th resistance one end connection number
Word, the other end connection second operational amplifier inverting input terminal, the 5th resistance one end connect second operational amplifier it is same
Phase input terminal, the other end be this circuit input terminal, the 6th resistance both ends connect second operational amplifier inverting input terminal and
The output end of second operational amplifier, the 7th resistance one end connect the non-inverting input terminal of second operational amplifier, another termination mould
Quasi- ground, first resistor both ends are connected to the output end of second operational amplifier and the homophase input of the first operational amplifier
End, first capacitor one end are connected to the tie point of first resistor and the first operational amplifier, another termination simulation ground, 3rd resistor
It is connected to the inverting input terminal of the first operational amplifier and the output end of the first operational amplifier, second resistance one end is connected to
The tie point of the inverting input terminal of one operational amplifier and 3rd resistor, another termination simulation ground, the first operational amplifier it is defeated
Outlet is the output end of this circuit.
In technical solution of the present invention, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, second operational amplifier
In-phase adder is constituted, 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, superimposed voltage relative to analog ground voltage size still be input voltage it is big
Small, first resistor and first capacitor constitute low-pass first order filter, play the role of filtering off clutter, second resistance, 3rd resistor,
First operational amplifier constitutes the voltage follower relative to simulation ground, can pass through the resistance of adjusting second resistance and 3rd resistor
Value adjusts the gain size of this voltage follower circuit, and the output end and input terminal of this sample voltage follower circuit constitute stable
Proportionate relationship not will receive the variation of external digital earth-return size of current and lead to the influence of internal simulation earth potential floating, mentions
The high tracking accuracy of analog voltage signal.
The invention has the advantages that
1, superimposed signal circuit is constructed by operational amplifier etc., so that voltage signal is relative to simulation stable, improved
The tracking accuracy of voltage signal.
2, this circuit structure is simple, low manufacture cost, changes to primary circuit little, it is easy to accomplish.
Detailed description of the invention
Fig. 1 is currently used voltage follower circuit schematic diagram；
Fig. 2 is that high-accuracy voltage of the present invention follows circuit diagram；
Specific embodiment
In voltage follower circuit shown in Fig. 2, digitally Gnd, the other end connect second to the connection of the 4th one end resistance R4
The inverting input terminal of operational amplifier U2, the 5th one end resistance R5 connect the non-inverting input terminal, another of second operational amplifier U2
End is the input terminal V_in of this circuit, and the 6th both ends resistance R6 connect the inverting input terminal and the second fortune of second operational amplifier U2
The output end of amplifier U2 is calculated, the 7th one end resistance R7 connects the non-inverting input terminal and the 5th resistance R5 of second operational amplifier U2
Tie point, another termination simulation ground AGnd, the both ends first resistor R1 are connected to the output end of second operational amplifier U2
With the non-inverting input terminal of the first operational amplifier U1, the one end first capacitor C1 is connected to first resistor R1 and the first operational amplifier
The tie point of U1, another termination simulation ground AGnd, 3rd resistor R3 be connected to the first operational amplifier U1 inverting input terminal and
The output end of first operational amplifier U1, the one end second resistance R2 are connected to the inverting input terminal and of the first operational amplifier U1
The tie point of three resistance R3, another termination simulation ground AGnd, the output end of the first operational amplifier U1 is the output of this circuit
Hold V_out.
In technical solution of the present invention, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the second fortune
It calculates amplifier U2 and constitutes in-phase adder, wherein R4=R6, R5=R7, so that simulation input potential UinWith simulation ground AGnd potential
UAGndSuperposition, obtains second operational amplifier output end potential Uout2=Uin+UAGnd, i.e. second operational amplifier output end voltage
Voltage relative to simulation ground AGnd is equal to V_in, first resistor R1 and first capacitor C1 and constitutes low-pass first order filter, plays
The effect of clutter is filtered off, second resistance R2,3rd resistor R3, the first operational amplifier U1 constitute voltage follower, can pass through
The resistance value of second resistance R2 and 3rd resistor R3 is adjusted to adjust the gain size of this voltage follower circuit, i.e. K=(R2+R3)/
R2, the output end (being referred to AGnd) of this sample voltage follower circuit and input terminal (being referred to Gnd) constitute stable ratio and close
System, i.e. Uout-UAGnd=K* (Uin-UGnd), not will receive external digital earth-return size of current variation and with leading to internal simulation
The influence that potential floats, improves the tracking accuracy of analog voltage signal, and this circuit structure is simple, low manufacture cost is right
Primary circuit change is little, it is easy to accomplish, it can be widely applied in the analog voltage signal Acquisition Circuit that there is degree of precision to require.
Claims (1)
1. a kind of high-accuracy voltage follows circuit, including the first operational amplifier, second operational amplifier, first capacitor, first
Resistance, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance and the 7th resistance, it is characterised in that: the 4th electricity
Hinder one end connection digitally, the other end connection second operational amplifier inverting input terminal, the 5th resistance one end connection second fortune
Calculate the non-inverting input terminal of amplifier, the input terminal that the other end is this circuit, the 6th resistance both ends connect second operational amplifier
The output end of inverting input terminal and second operational amplifier, the 7th resistance one end connect the homophase input of second operational amplifier
End, another termination simulation ground, first resistor both ends are connected to the output end and the first operation amplifier of second operational amplifier
The non-inverting input terminal of device, first capacitor one end are connected to the tie point of first resistor and the first operational amplifier, another termination mould
Quasi- ground, 3rd resistor are connected to the inverting input terminal 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 terminal 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 |
Applications Claiming Priority (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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107621842A CN107621842A (en) | 2018-01-23 |
| CN107621842B true 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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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
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 |
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| CN107621842A (en) | 2018-01-23 |
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