CN109444792A - A kind of circuit reducing current sensor sampling error - Google Patents
A kind of circuit reducing current sensor sampling error Download PDFInfo
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- CN109444792A CN109444792A CN201811350650.3A CN201811350650A CN109444792A CN 109444792 A CN109444792 A CN 109444792A CN 201811350650 A CN201811350650 A CN 201811350650A CN 109444792 A CN109444792 A CN 109444792A
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- 238000005070 sampling Methods 0.000 title claims abstract description 20
- 230000003750 conditioning effect Effects 0.000 claims abstract description 12
- 230000003321 amplification Effects 0.000 claims abstract description 10
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 10
- 230000005611 electricity Effects 0.000 claims description 7
- 238000005259 measurement Methods 0.000 claims description 4
- 230000003068 static effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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- Power Engineering (AREA)
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- General Physics & Mathematics (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
The present invention provides a kind of circuits for reducing current sensor sampling error, eliminate VCC bring error by the current sensor signal conditioning circuit with reference power source.It includes reference power source generation circuit, current sensor signal conditioning circuit, and the current sensor signal conditioning circuit includes current sensor, and current sensor inputs VCC and GND, exports V2, export V2First line on connect resistance R3, bias voltage VoffsetConnect resistance R5After form the second route, first line, the second lines in parallel access operational amplifier U2Positive input terminal, the voltage V that the output end of reference power source generation circuit generates1, the outlet line connection resistance R of reference power source generation circuit4Operational amplifier U is accessed afterwards2Negative input end, operational amplifier U2Output end and negative input end between be connected with resistance R6, the operational amplifier U2Output end V is obtained by above-mentioned subtraction amplification circuit2And V1Difference V3, wherein R3Equal to R4Resistance value, R5Equal to R6Resistance value, the voltage V that the output end of the reference power source generation circuit generates1Numerical value be 0.5VCC.
Description
Technical field
The present invention relates to the technical field of current sensor sampling, specially a kind of reduction current sensor sampling error
Circuit.
Background technique
The current sampling circuit of low error is the basis of motor control, and the supply voltage static difference of current sensor or fluctuation are
It generates one of the reason of sampling error, and supply voltage static difference causes tested current zero to float；Mains ripple causes sampling hair
It pierces larger.
The general output calculation formula of current sensor are as follows:
Wherein VoutFor sensor output voltage value；Voe=0.5*VCC, VCC are the supply voltage of current sensor；k1It is
The intrinsic gain of current sensor；IpIt is actual measurement electric current；IpnIt is sensor useful range.By formula (1) as it can be seen that if IpNo
Become, the static difference of VCC or fluctuation also lead to VoutVariation, to generate current sample error.
In order to reduce the output error of current signal conditioning circuit, should be reduced as far as possible in hardware circuit design or complete
It totally disappeared except VCC static difference or fluctuation bring error.
Summary of the invention
In view of the above-mentioned problems, passing through band ginseng the present invention provides a kind of circuit for reducing current sensor sampling error
The current sensor signal conditioning circuit for examining power supply eliminates VCC bring error.
A kind of circuit reducing current sensor sampling error, it is characterised in that: it includes reference power source generation circuit, electricity
Flow sensor signal conditioning circuit, the current sensor signal conditioning circuit includes current sensor, the current sensor
VCC and GND is inputted, V is exported2, the output V2First line on connect resistance R3, bias voltage VoffsetConnect resistance R5Afterwards
The second route is formed, the first line, the second lines in parallel access operational amplifier U2Positive input terminal, the reference power source
The voltage V that the output end of generation circuit generates1, the outlet line connection resistance R of the reference power source generation circuit4Access fortune afterwards
Calculate amplifier U2Negative input end, the operational amplifier U2Output end and negative input end between be connected with resistance R6, the operation
Amplifier U2Output end V is obtained by above-mentioned subtraction amplification circuit2And V1Difference V3, wherein R3Equal to R4Resistance value, R5Deng
In R6Resistance value, the voltage V that the output end of the reference power source generation circuit generates1Numerical value be 0.5VCC.
It is further characterized by: the bias voltage VoffsetIt is generated by high-precision power fiducial chip, value is
Voffset=0.5Vadc_ref, Vadc_refIt is the intrinsic reference voltage inside ADC sampling A/D chip；
By modifying R3、R4、R5、R6The gain of adjustable amplifying circuit passes through the available V of subtraction amplification circuit2With
V1Difference V3,k1It is the intrinsic gain of current sensor, IpIt is actual measurement electric current, IpnIt is electricity
Flow sensor useful range；
The reference power source generation circuit includes resistance R1、R2Operational amplifier U1, operational amplifier U1Positive input terminal simultaneously
It is associated with two-way route, wherein connection resistance R all the way1The supply voltage VCC of current sensor is connected afterwards, and another way route connects
Connecting resistance R2After be grounded, the operational amplifier U1Output end and negative input end between be connected to, the operational amplifier U1Output
End is the voltage V that the output end of reference power source generation circuit generates1。
After applying the present invention, the voltage V that reference power source generation circuit output end generates1Numerical value be 0.5VCC, V2Size is such as
Shown in formula (1)；R3~R6, U2Form subtraction amplification circuit, R3And R4It is equal to be designed as resistance value, R5And R6It is equal to be designed as resistance value,
Modify R3、R4、R5、R6The gain of adjustable amplifying circuit passes through the available V of subtraction amplification circuit2And V1Difference, i.e.,
V3, formula is as follows:
Consider formula (1) and formula (2), can obtain
Wherein VoffsetFor bias voltage, due to IpThere are negative value, need to introduce bias voltage V in circuitoffset。
VoffsetIt is generated by high-precision power fiducial chip, value Voffset=0.5Vadc_ref, Vadc_refIt is inside ADC sampling A/D chip
Intrinsic reference voltage, by formula (4) as it can be seen that in calculation formula unpowered voltage VCC presence, i.e. circuit can completely eliminate
The influence of VCC generates the reference voltage for following VCC to change by reference to power generation circuit, is obtained by subtraction circuit
To the difference of current sensor output and reference voltage, generated in current sensor output to eliminate VCC variation
Influence.
Detailed description of the invention
Fig. 1 is the structure schematic diagram of reference power source generation circuit of the invention；
Fig. 2 is current sensor signal conditioning circuit structure schematic diagram of the invention.
Specific embodiment
A kind of circuit reducing current sensor sampling error, see Fig. 1, Fig. 2: it includes reference power source generation circuit, electricity
Flow sensor signal conditioning circuit, current sensor signal conditioning circuit include current sensor, current sensor input VCC and
GND exports V2, export V2First line on connect resistance R3, bias voltage VoffsetConnect resistance R5After form the second route,
First line, the second lines in parallel access operational amplifier U2Positive input terminal, the output end of reference power source generation circuit generates
Voltage V1, the outlet line connection resistance R of reference power source generation circuit4Operational amplifier U is accessed afterwards2Negative input end, operation
Amplifier U2Output end and negative input end between be connected with resistance R6, operational amplifier U2Output end amplified by above-mentioned subtraction
Circuit obtains V2And V1Difference V3, wherein R3Equal to R4Resistance value, R5Equal to R6Resistance value, the output of reference power source generation circuit
Hold the voltage V generated1Numerical value be 0.5VCC.
Bias voltage VoffsetIt is generated by high-precision power fiducial chip, value Voffset=0.5Vadc_ref, Vadc_refIt is
Intrinsic reference voltage inside ADC sampling A/D chip；
By modifying R3、R4、R5、R6The gain of adjustable amplifying circuit passes through the available V of subtraction amplification circuit2With
V1Difference V3,k1It is the intrinsic gain of current sensor, IpIt is actual measurement electric current, IpnIt is electricity
Flow sensor useful range；
Reference power source generation circuit includes resistance R1、R2Operational amplifier U1, operational amplifier U1Positive input terminal be parallel with
Two-way route, wherein connection resistance R all the way1The supply voltage VCC of current sensor, another way connection electricity are connected afterwards
Hinder R2After be grounded, operational amplifier U1Output end and negative input end between be connected to, operational amplifier U1Output end be with reference to electricity
The voltage V that the output end of source generating circuit generates1。
After applying the present invention, the voltage V that reference power source generation circuit output end generates1Numerical value be 0.5VCC, V2Size is such as
Shown in formula (1)；R3~R6, U2Form subtraction amplification circuit, R3And R4It is equal to be designed as resistance value, R5And R6It is equal to be designed as resistance value,
Modify R3、R4、R5、R6The gain of adjustable amplifying circuit passes through the available V of subtraction amplification circuit2And V1Difference, i.e.,
V3, formula is as follows:
Consider formula (1) and formula (2), can obtain
Wherein VoffsetFor bias voltage, due to IpThere are negative value, need to introduce bias voltage V in circuitoffset。
VoffsetIt is generated by high-precision power fiducial chip, value Voffset=0.5Vadc_ref, Vadc_refIt is inside ADC sampling A/D chip
Intrinsic reference voltage, by formula (4) as it can be seen that in calculation formula unpowered voltage VCC presence, i.e. circuit can completely eliminate
The influence of VCC generates the reference voltage for following VCC to change by reference to power generation circuit, is obtained by subtraction circuit
To the difference of current sensor output and reference voltage, generated in current sensor output to eliminate VCC variation
Influence.
Specific embodiments of the present invention are described in detail above, but content is only the preferable implementation of the invention
Example, should not be considered as limiting the invention the practical range of creation.It is all to become according to equalization made by the invention application range
Change and improve etc., it shall still fall within the scope of this patent.
Claims (4)
1. a kind of circuit for reducing current sensor sampling error, it is characterised in that: it includes reference power source generation circuit, electric current
Sensor signal conditioning circuit, the current sensor signal conditioning circuit includes current sensor, and the current sensor is defeated
Enter VCC and GND, exports V2, the output V2First line on connect resistance R3, bias voltage VoffsetConnect resistance R5Shape afterwards
At the second route, the first line, the second lines in parallel access operational amplifier U2Positive input terminal, the reference power source produces
The voltage V that the output end of raw circuit generates1, the outlet line connection resistance R of the reference power source generation circuit4After access operation
Amplifier U2Negative input end, the operational amplifier U2Output end and negative input end between be connected with resistance R6, the operation puts
Big device U2Output end V is obtained by above-mentioned subtraction amplification circuit2And V1Difference V3, wherein R3Equal to R4Resistance value, R5Equal to R6
Resistance value, the voltage V that the output end of the reference power source generation circuit generates1Numerical value be 0.5VCC.
2. a kind of circuit for reducing current sensor sampling error as described in claim 1, it is characterised in that: the biased electrical
Press VoffsetIt is generated by high-precision power fiducial chip, value Voffset=0.5Vadc_ref, Vadc_refIt is inside ADC sampling A/D chip
Intrinsic reference voltage.
3. a kind of circuit for reducing current sensor sampling error as claimed in claim 2, it is characterised in that: by modifying R3、
R4、R5、R6The gain of adjustable amplifying circuit passes through the available V of subtraction amplification circuit2And V1Difference V3,k1It is the intrinsic gain of current sensor, IpIt is actual measurement electric current, IpnIt is that current sensor has
Imitate range.
4. a kind of circuit for reducing current sensor sampling error as described in claim 1, it is characterised in that: described with reference to electricity
Source generating circuit includes resistance R1、R2Operational amplifier U1, operational amplifier U1Positive input terminal be parallel with two-way route, wherein
Connection resistance R all the way1The supply voltage VCC, another way connection resistance R of current sensor are connected afterwards2After be grounded, institute
State operational amplifier U1Output end and negative input end between be connected to, the operational amplifier U1Output end be reference power source produce
The voltage V that the output end of raw circuit generates1。
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811350650.3A CN109444792B (en) | 2018-11-14 | 2018-11-14 | Circuit for reducing sampling error of current sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811350650.3A CN109444792B (en) | 2018-11-14 | 2018-11-14 | Circuit for reducing sampling error of current sensor |
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| CN109444792A true CN109444792A (en) | 2019-03-08 |
| CN109444792B CN109444792B (en) | 2021-08-17 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111929629A (en) * | 2020-07-22 | 2020-11-13 | 一巨自动化装备（上海）有限公司 | Current calibration method and system through voltage compensation of current sensor |
| CN113014128A (en) * | 2021-03-26 | 2021-06-22 | 安徽电气工程职业技术学院 | DCAC control circuit in domestic dc-to-ac converter |
| CN113485508A (en) * | 2021-07-09 | 2021-10-08 | 珠海格力电器股份有限公司 | Voltage reference regulating circuit, processing circuit and servo driver |
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|---|---|---|---|---|
| JPH0980081A (en) * | 1995-09-14 | 1997-03-28 | Matsushita Electric Ind Co Ltd | Current detection sensor |
| CN202471824U (en) * | 2011-12-23 | 2012-10-03 | 河南瑞特电气有限公司 | AC sampling circuit |
| CN204789716U (en) * | 2015-06-19 | 2015-11-18 | 河南康派智能技术有限公司 | Three -phase alternating current piezoelectricity of being applied to electric power instrument flows acquisition circuit |
| CN204989283U (en) * | 2015-05-28 | 2016-01-20 | 海特尔机电工程技术（马鞍山）有限公司 | Inductive current sampling and dc component detection circuitry among SVG |
| US20160370440A1 (en) * | 2012-01-25 | 2016-12-22 | Asahi Kasei Microdevices Corporation | Hall electromotive force signal detection circuit and current sensor thereof |
-
2018
- 2018-11-14 CN CN201811350650.3A patent/CN109444792B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0980081A (en) * | 1995-09-14 | 1997-03-28 | Matsushita Electric Ind Co Ltd | Current detection sensor |
| CN202471824U (en) * | 2011-12-23 | 2012-10-03 | 河南瑞特电气有限公司 | AC sampling circuit |
| US20160370440A1 (en) * | 2012-01-25 | 2016-12-22 | Asahi Kasei Microdevices Corporation | Hall electromotive force signal detection circuit and current sensor thereof |
| CN204989283U (en) * | 2015-05-28 | 2016-01-20 | 海特尔机电工程技术（马鞍山）有限公司 | Inductive current sampling and dc component detection circuitry among SVG |
| CN204789716U (en) * | 2015-06-19 | 2015-11-18 | 河南康派智能技术有限公司 | Three -phase alternating current piezoelectricity of being applied to electric power instrument flows acquisition circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111929629A (en) * | 2020-07-22 | 2020-11-13 | 一巨自动化装备（上海）有限公司 | Current calibration method and system through voltage compensation of current sensor |
| WO2022016813A1 (en) * | 2020-07-22 | 2022-01-27 | 一巨自动化装备（上海）有限公司 | Current calibration method and system based on voltage compensation of current sensor |
| CN113014128A (en) * | 2021-03-26 | 2021-06-22 | 安徽电气工程职业技术学院 | DCAC control circuit in domestic dc-to-ac converter |
| CN113485508A (en) * | 2021-07-09 | 2021-10-08 | 珠海格力电器股份有限公司 | Voltage reference regulating circuit, processing circuit and servo driver |
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