CN101825476B - High-accuracy signal detection amplifying circuit - Google Patents
High-accuracy signal detection amplifying circuit Download PDFInfo
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- CN101825476B CN101825476B CN2010101671927A CN201010167192A CN101825476B CN 101825476 B CN101825476 B CN 101825476B CN 2010101671927 A CN2010101671927 A CN 2010101671927A CN 201010167192 A CN201010167192 A CN 201010167192A CN 101825476 B CN101825476 B CN 101825476B
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Abstract
The invention discloses a high-accuracy signal detection amplifying circuit, which comprises a first operation amplifier A1, a second operation amplifier A2, four input resistors and four feedback resistors, wherein the four input resistors comprise a first input resistor Ri1, a second input resistor Ri2, a third input resistor Ri3 and a fourth input resistor Ri4; and the four feedback resistors comprise a first feedback resistor Rf1, a second feedback resistor Rf2, a third feedback resistor Rf3 and a fourth feedback resistor Rf4. The high-accuracy signal detection amplifying circuit is a signal online detection amplifying circuit used for an intelligent electric network and an intelligent building, which can automatically eliminate measurement errors caused by wiring, null drift, temperature drift and common mode interfering signals, and has a high accuracy and a low cost.
Description
Technical field
The present invention relates to a kind of high-accuracy signal detection amplifying circuit, relate in particular to the online detection amplifying circuit of the signal that is used for intelligent grid and intelligent building.
Technical background
Signal detection amplifying circuit is big amount control system, the indispensable circuit of detection system.Be used for amplification to various sensor signals so that the wireline inspection of back and control.Especially in the signal on-line detecting system of intelligent grid and intelligent building.Because there is the measuring error that wiring, drift, temperature are floated and common mode interference signal causes in the sensor scene, therefore, eliminate this type of error as far as possible to the having relatively high expectations of signal detection amplifying circuit.
Normal signal detects amplifying circuit, can't eliminate above-mentioned error fully, exists like this that efficient is low, the shortcoming of low precision.
Summary of the invention
The objective of the invention is to eliminate the sensor scene and have the measuring error that wiring, drift, temperature are floated and common mode interference signal causes; And a kind of amplifying circuit that is used for the online detection of signal of intelligent grid and intelligent building is provided, it has the advantage that error is little, precision is high, cost is low.
The technical scheme that realizes above-mentioned purpose is: a kind of signal detection amplifying circuit of precision; This signal detection amplifying circuit detects the anodal V+ and the negative pole V-signal of measured signal respectively; Wherein, it comprises first operational amplifier A 1, second operational amplifier A 2, four input resistances, four feedback resistances, and four input resistances are first to fourth input resistance Ri1 to Ri4; Four feedback resistances are first to fourth feedback resistance Rf1 to Rf4, wherein:
Be in series with the first input resistance Ri1 between the anodal V+ of the normal phase input end of described first operational amplifier A 1 and signal to be detected; Be in series with the second input resistance Ri2 between the negative pole V-of inverting input and signal to be detected; Be in series with the first feedback resistance Rf1 between normal phase input end and the ground wire datum, be in series with the second feedback resistance Rf2 between the output end vo 1 of the inverting input and first operational amplifier A 1;
Be in series with the 3rd input resistance Ri3 between the negative pole V-of the normal phase input end of described second operational amplifier A 2 and signal to be detected, be in series with the 4th input resistance Ri4 between the anodal V+ of inverting input and signal to be detected; Be in series with the 3rd feedback resistance Rf3 between normal phase input end and the ground wire datum, be in series with the 4th feedback resistance Rf4 between the output end vo 2 of the inverting input and second operational amplifier A 2;
Described first operational amplifier A 1 is the operational amplifiers that are positioned at two identical parameters of same integrated circuit with described second operational amplifier A 2.
Above-mentioned a kind of high-accuracy signal detection amplifying circuit, wherein, the resistance of described first to fourth input resistance Ri1 to Ri4 equates.
Above-mentioned a kind of high-accuracy signal detection amplifying circuit, wherein, the resistance of described first to fourth feedback resistance Rf1 to Rf4 equates.
The invention has the beneficial effects as follows: the online detection amplifying circuit of signal that is used for intelligent grid and intelligent building of the present invention, can eliminate wiring, drift, temperature is floated and common mode interference signal causes measuring error automatically, precision is high, cost is low.
Description of drawings
Fig. 1 is the circuit diagram of a kind of high-accuracy signal detection amplifying circuit of the present invention.
Embodiment
To combine accompanying drawing that the present invention is described further below.
See also Fig. 1; A kind of high-accuracy signal detection amplifying circuit that is used for the online detection of signal of intelligent grid and intelligent building has been shown among the figure; This signal detection amplifying circuit detects the anodal V+ and the negative pole V-signal of measured signal respectively, and it comprises first operational amplifier A 1, second operational amplifier A 2, four input resistances, four feedback resistances, and four input resistances are first to fourth input resistance Ri1 to Ri4; Four feedback resistances are first to fourth feedback resistance Rf1 to Rf4, wherein:
Be in series with the first input resistance Ri1 between the anodal V+ of the normal phase input end of first operational amplifier A 1 and signal to be detected; Be in series with the second input resistance Ri2 between the negative pole V-of inverting input and signal to be detected; Be in series with the first feedback resistance Rf1 between normal phase input end and the ground wire datum, be in series with the second feedback resistance Rf2 between the output end vo 1 of the inverting input and first operational amplifier A 1;
Be in series with the 3rd input resistance Ri3 between the negative pole V-of the normal phase input end of second operational amplifier A 2 and signal to be detected, be in series with the 4th input resistance Ri4 between the anodal V+ of inverting input and signal to be detected; Be in series with the 3rd feedback resistance Rf3 between normal phase input end and the ground wire datum, be in series with the 4th feedback resistance Rf4 between the output end vo 2 of the inverting input and second operational amplifier A 2;
First operational amplifier A 1 is the operational amplifiers that are positioned at two identical parameters of same integrated circuit with described second operational amplifier A 2;
The resistance of first to fourth input resistance Ri1 to Ri4 equates to be Ri;
The resistance of first to fourth feedback resistance Rf1 to Rf4 equates to be Rf.
Principle of work of the present invention: first operational amplifier A
1Normal phase input end voltage equals the reverse inter-input-ing voltage terminal voltage and equals V1, and normal phase input end voltage is represented as follows with formula 1:
V1=V+ * Rf/ (Ri+Rf), formula 1
First operational amplifier A
1Normal phase input end voltage equals the reverse inter-input-ing voltage terminal voltage and equals V1, and inverting input voltage is represented as follows with formula 2:
V1=(Vo1-V-) * Ri/ (Ri+Rf), formula 2
First operational amplifier A
1Output Vo1 represent as follows with formula 3:
Vo1=(V+-V-) * Rf/Ri, formula 3
Second operational amplifier A
2Normal phase input end voltage equals the reverse inter-input-ing voltage terminal voltage and equals V2, and normal phase input end voltage is represented as follows with formula 4:
V2=V-* Rf/ (Ri+Rf), formula 4
Second operational amplifier A, 2 normal phase input end voltages equal the reverse inter-input-ing voltage terminal voltage and equal V2, and inverting input voltage is represented as follows with formula 5:
V2=(Vo2-V+) * Ri/ (Ri+Rf), formula 5
The output Vo2 of second operational amplifier A 2 representes as follows with formula 6:
Vo2=-(V+-V-) * Rf/Ri, formula 6
It is identical, in the opposite direction to obtain two enlargement factors respectively by formula 3 and formula 6, the signal of the difference of direct ratio and signal both positive and negative polarity to be detected.Field wiring of carrying secretly in the signal to be detected and common mode interference signal are in-phase signal Vr; In formula 3 and formula 6, V+ uses the Vr+V+ substitution, and V-uses the Vr+V-substitution; Signal input reality is (V+-V-) still, has eliminated field wiring and the common mode interference signal carried secretly in the signal to be detected.
First operational amplifier A 1 and second operational amplifier A 2 are the operational amplifiers that are positioned at two identical parameters of same integrated circuit.It is VW that drift, the temperature that operational amplifier produces floated signal.Then formula 3 converts following formula 7 and formula 8 to formula 6
Vo1+VW=(V+-V-) * Rf/Ri, formula 7
Vo2+VW=-(V+-V-) * Rf/Ri, formula 8
In the level sample circuit of back, only need the result of formula 7 and formula 8 be subtracted each other, obtains following formula as a result 9:
Formula 7-formula 8=2 (V+-V-) * Rf/Ri, formula 9
Formula 9 has been eliminated the error that drift, temperature are floated signal fully, and has further improved enlargement factor, has improved precision simultaneously.
In the present embodiment, first, second operational amplifier A
1, A
2Be LM062, input resistance Ri=10K Ω, feedback resistance Rf=100K.
More than combine accompanying drawing embodiment that the present invention is specified, those skilled in the art can make the many variations example to the present invention according to above-mentioned explanation.Thereby some details among the embodiment should not constitute qualification of the present invention, and the scope that the present invention will define with appended claims is as protection scope of the present invention.
Claims (3)
1. high-accuracy signal detection amplifying circuit; This signal detection amplifying circuit detects the anodal V+ and the negative pole V-signal of measured signal respectively; It is characterized in that it comprises first operational amplifier A 1, second operational amplifier A 2, four input resistances, four feedback resistances, four input resistances are first to fourth input resistance Ri1 to Ri4; Four feedback resistances are first to fourth feedback resistance Rf1 to Rf4, wherein:
Be in series with the first input resistance Ri1 between the anodal V+ of the normal phase input end of described first operational amplifier A 1 and signal to be detected; Be in series with the second input resistance Ri2 between the negative pole V-of inverting input and signal to be detected; Be in series with the first feedback resistance Rf1 between normal phase input end and the ground wire datum, be in series with the second feedback resistance Rf2 between the output end vo 1 of the inverting input and first operational amplifier A 1;
Be in series with the 3rd input resistance Ri3 between the negative pole V-of the normal phase input end of described second operational amplifier A 2 and signal to be detected, be in series with the 4th input resistance Ri4 between the anodal V+ of inverting input and signal to be detected; Be in series with the 3rd feedback resistance Rf3 between normal phase input end and the ground wire datum, be in series with the 4th feedback resistance Rf4 between the output end vo 2 of the inverting input and second operational amplifier A 2;
Described first operational amplifier A 1 is the operational amplifiers that are positioned at two identical parameters of same integrated circuit with described second operational amplifier A 2.
2. a kind of high-accuracy signal detection amplifying circuit according to claim 1 is characterized in that, the resistance of described first to fourth input resistance Ri1 to Ri4 equates.
3. a kind of high-accuracy signal detection amplifying circuit according to claim 1 is characterized in that, the resistance of described first to fourth feedback resistance Rf1 to Rf4 equates.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010101671927A CN101825476B (en) | 2010-05-10 | 2010-05-10 | High-accuracy signal detection amplifying circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101671927A CN101825476B (en) | 2010-05-10 | 2010-05-10 | High-accuracy signal detection amplifying circuit |
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| CN101825476A CN101825476A (en) | 2010-09-08 |
| CN101825476B true CN101825476B (en) | 2012-03-28 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102944744A (en) * | 2012-11-06 | 2013-02-27 | 昆山北极光电子科技有限公司 | Low-drift online impedance measurement circuit |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1032123A2 (en) * | 1999-02-26 | 2000-08-30 | General Motors Corporation | Signal amplifying circuit |
| DE102004049084A1 (en) * | 2004-10-08 | 2006-04-13 | Robert Bosch Gmbh | Sensor interface with integrated current measurement |
| CN1789919A (en) * | 2004-12-16 | 2006-06-21 | 冲电气工业株式会社 | Output amplifier circuit and sensor device using the same |
| CN101431315A (en) * | 2008-11-21 | 2009-05-13 | 陕西海泰电子有限责任公司 | Graded amplifying circuit and multifunctional data acquisition card |
| CN101552594A (en) * | 2008-04-03 | 2009-10-07 | 上海工程技术大学 | High-fidelity power amplifying circuit in power supply regenerator |
-
2010
- 2010-05-10 CN CN2010101671927A patent/CN101825476B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1032123A2 (en) * | 1999-02-26 | 2000-08-30 | General Motors Corporation | Signal amplifying circuit |
| DE102004049084A1 (en) * | 2004-10-08 | 2006-04-13 | Robert Bosch Gmbh | Sensor interface with integrated current measurement |
| CN1789919A (en) * | 2004-12-16 | 2006-06-21 | 冲电气工业株式会社 | Output amplifier circuit and sensor device using the same |
| CN101552594A (en) * | 2008-04-03 | 2009-10-07 | 上海工程技术大学 | High-fidelity power amplifying circuit in power supply regenerator |
| CN101431315A (en) * | 2008-11-21 | 2009-05-13 | 陕西海泰电子有限责任公司 | Graded amplifying circuit and multifunctional data acquisition card |
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Application publication date: 20100908 Assignee: Shanghai Zhenghua Medical Equipment Co., Ltd. Assignor: Shanghai Xinyi Electric Technological Co., Ltd. Contract record no.: 2012310000161 Denomination of invention: High-accuracy signal detection amplifying circuit Granted publication date: 20120328 License type: Exclusive License Record date: 20120912 |
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Owner name: SHANGHAI XINXIANG ELECTRONIC CONTROL TECHNOLOGY CO Effective date: 20130514 Owner name: SHANGHAI ELECTRIC POWER CORP. Free format text: FORMER OWNER: SHANGHAI XINXIANG ELECTRONIC CONTROL TECHNOLOGY CO., LTD. Effective date: 20130514 |
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