CN113884960A - High-precision calibration method for current measured by shunt method - Google Patents
High-precision calibration method for current measured by shunt method Download PDFInfo
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- CN113884960A CN113884960A CN202010633025.0A CN202010633025A CN113884960A CN 113884960 A CN113884960 A CN 113884960A CN 202010633025 A CN202010633025 A CN 202010633025A CN 113884960 A CN113884960 A CN 113884960A
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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
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
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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
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
- G01R35/007—Standards or reference devices, e.g. voltage or resistance standards, "golden references"
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- Measurement Of Current Or Voltage (AREA)
Abstract
The invention discloses a high-precision calibration method for measuring current by a shunt method, which comprises a direct current power supply, wherein the direct current power supply is fixedly connected with a sampling amplifying circuit and can provide stable low-ripple direct current power supply input for the circuit, the sampling amplifying circuit is simultaneously connected with an electronic load and a temperature sensor, the direct current power supply, the sampling amplifying circuit and the electronic load are in a loop current structure, so that the current flowing through the sampling amplifying circuit is controlled by the electronic load, the electronic load and the temperature sensor are simultaneously connected with a microprocessor, an electrical connection structure is arranged between the temperature sensor and the microprocessor, temperature data of the sampling amplifying circuit can be transmitted to the microprocessor, under the coordination of a calibration algorithm, only the temperature sensor is required to be added for a traditional shunt circuit, and then a standard electronic load instrument and a direct current power supply are used for calibrating the circuit, the influence of various errors such as ADC error, sampling resistance nonlinearity and temperature drift can be eliminated, and therefore the circuit can measure at high precision.
Description
Technical Field
The invention belongs to the technical field of related high-precision calibration methods, and particularly relates to a high-precision calibration method for currents measured by a shunt method.
Background
Electrically, it is specified that the direction in which the positive charges directionally flow is the direction of current flow. In engineering, the directional flowing direction of positive charges is taken as the current direction, and the intensity of the current is expressed by the charge Q flowing through the cross section of the conductor in unit time, and is called as the current intensity.
At present, high-precision measurement under large current is usually carried out by adopting a scheme of a mutual inductor or a Hall sensor, but in practice, a traditional sampling resistance shunt method may be adopted based on various factor limitations such as cost, volume and the like. However, when a shunt method is used to directly measure a large current, the accuracy is often low due to the influence of comprehensive factors such as ADC errors, nonlinearity of components and parts, temperature drift and the like, and in a current measurement system, the current is difficult to measure because the measured component and the measurement instrument are connected in series and the load effect is large.
Disclosure of Invention
The invention aims to provide a high-precision calibration method for current measurement by a split-flow method, which aims to solve the problem that the existing intelligent induction reaction kettle observation device proposed in the background art cannot be well sealed when being used for a long time, so that internal chemical gas is easy to overflow.
In order to achieve the purpose, the invention provides the following technical scheme:
a high-precision calibration method for current measurement by a shunt method comprises a direct current power supply and is characterized in that: the direct current power supply is fixedly connected to the sampling amplifying circuit, the sampling amplifying circuit is connected with the electronic load and the temperature sensor at the same time, and the electronic load and the temperature sensor are connected to the microprocessor at the same time.
Preferably, the direct current power supply can provide a stable and low-ripple direct current power supply input for the circuit.
Preferably, an electrical connection structure exists between the temperature sensor and the microprocessor.
Preferably, the direct current power supply, the sampling amplification circuit and the electronic load are in a loop current structure.
Compared with the prior art, the invention provides a high-precision calibration method for the current measured by the shunt method, which has the following beneficial effects:
the utility model relates to a carry out high accuracy calibration method to shunt measurement current, the structure includes DC power supply, sampling amplifier circuit, electronic load, microprocessor and 5 most of temperature sensor. Wherein DC power supply and sampling amplifier circuit electrical connection, can provide the DC power supply input of stable low ripple for the circuit, there is electrical connection in sampling amplifier circuit and electronic load, make DC power supply, sampling amplifier circuit, electronic load form a return circuit and make the electric current that flows through in the sampling amplifier circuit controlled by electronic load, and temperature sensor has electrical connection with microprocessor, can transmit the temperature data who measures sampling amplifier circuit to microprocessor, under the cooperation of calibration algorithm, only need to add temperature sensor for traditional shunt circuit, then use standard electronic load appearance, DC power supply calibrates the circuit, can eliminate the influence of multiple errors such as ADC error, sampling resistance nonlinearity and temperature drift. The traditional shunt method can directly measure large current in high precision and real time without other components, so that the circuit can realize the precision measurement of 0.1A in the ranges of 20-100 ℃, 0.1-100A and even higher.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention without limiting the invention in which:
FIG. 1 is a schematic structural diagram of a method for calibrating current measured by a shunt method with high precision according to the present invention;
in the figure: 1. a direct current power supply; 2. a sampling amplifying circuit; 3. an electronic load; 4. a temperature sensor; 5. a microprocessor.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention provides a technical solution:
the utility model provides a carry out high accuracy calibration method to current that divides current method to measure, includes DC power supply 1, DC power supply 1 fixed connection is in sampling amplifier circuit 2, can provide the DC power supply input of stable low ripple for the circuit, sampling amplifier circuit 2 connects electronic load 3 and temperature sensor 4 simultaneously, DC power supply 1, sampling amplifier circuit 2 and electronic load 3 are a return circuit current structure for the electric current that flows through in sampling amplifier circuit 2 is controlled by electronic load 3, electronic load 3 and temperature sensor 4 connect simultaneously in microprocessor 5, there is the electrical connection structure between temperature sensor 4 and microprocessor 5, can transmit the temperature data that measure sampling amplifier circuit 2 to microprocessor 5, under the cooperation of calibration algorithm, only need add temperature sensor 5 for traditional shunt circuit, then use standard electronic load appearance, The direct current power supply calibrates the circuit, and the influence of various errors such as ADC error, sampling resistance nonlinearity and temperature drift can be eliminated, so that the traditional shunt method can directly measure large current in real time with high precision without other components, and the circuit can realize the precision measurement of 0.1A in the ranges of 20-100 ℃, 0.1-100A and even higher.
The working principle and the using process of the invention are as follows: the direct current power supply 1 is fixedly connected with the sampling amplifying circuit 2 and can provide stable low-ripple direct current power supply input for the circuit, the sampling amplifying circuit 2 is simultaneously connected with the electronic load 3 and the temperature sensor 4, thus forming a loop current structure, the current flowing through the sampling amplifying circuit 2 is controlled by the electronic load 3, the electronic load 3 and the temperature sensor 4 are simultaneously connected with the microprocessor 5 and can transmit the temperature data of the sampling amplifying circuit 2 to the microprocessor 5,
then, a standard electronic load instrument and a direct current power supply are used for calibrating the circuit, so that the influence of various errors such as ADC (analog to digital converter) errors, sampling resistor nonlinearity, temperature drift and the like can be eliminated, and the circuit can realize the precision measurement of 0.1A in 20-100 ℃, 0.1-100A and even higher ranges.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. A method for carrying out high-precision calibration on current measured by a shunt method comprises a direct current power supply (1), and is characterized in that: direct current power supply (1) fixed connection is in sampling amplifier circuit (2), electronic load (3) and temperature sensor (4) are connected simultaneously in sampling amplifier circuit (2), electronic load (3) and temperature sensor (4) are connected in microprocessor (5) simultaneously.
2. A method for calibrating shunt-current measurement with high accuracy according to claim 1, wherein: the direct current power supply (1) can provide stable and low-ripple direct current power supply input for a circuit.
3. A method for calibrating shunt-current measurement with high accuracy according to claim 1, wherein: an electrical connection structure exists between the temperature sensor (4) and the microprocessor (5).
4. A method for calibrating shunt-current measurement with high accuracy according to claim 1, wherein: the direct current power supply (1), the sampling amplification circuit (2) and the electronic load (3) are of a loop current structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010633025.0A CN113884960A (en) | 2020-07-02 | 2020-07-02 | High-precision calibration method for current measured by shunt method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010633025.0A CN113884960A (en) | 2020-07-02 | 2020-07-02 | High-precision calibration method for current measured by shunt method |
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| CN113884960A true CN113884960A (en) | 2022-01-04 |
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| CN202010633025.0A Pending CN113884960A (en) | 2020-07-02 | 2020-07-02 | High-precision calibration method for current measured by shunt method |
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Citations (9)
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| CN201364383Y (en) * | 2009-01-12 | 2009-12-16 | 上海市质量监督检验技术研究院 | Automatic metering calibrating device for leakage current instrument |
| CN201654101U (en) * | 2010-04-02 | 2010-11-24 | 浙江省质量技术监督检测研究院 | Low power point detection device of electric toy |
| CN103048530A (en) * | 2011-10-12 | 2013-04-17 | 鸿富锦精密工业（深圳）有限公司 | Current calibration device of digital power supply |
| CN203414580U (en) * | 2013-06-24 | 2014-01-29 | 吴锦来 | Precision dual temperature correction circuit of electronic load |
| CN104871027A (en) * | 2012-12-20 | 2015-08-26 | 大陆-特韦斯贸易合伙股份公司及两合公司 | Method for calibrating a current sensor |
| CN104977451A (en) * | 2014-04-04 | 2015-10-14 | 浙江巨磁智能技术有限公司 | Method of detecting current in a shunting way by current sensor |
| CN107728094A (en) * | 2017-10-23 | 2018-02-23 | 宁德时代新能源科技股份有限公司 | Current calibration coefficient measuring device and method, and current detecting device and method |
| CN109164404A (en) * | 2018-08-10 | 2019-01-08 | 烽火通信科技股份有限公司 | The system and method that sample circuit in circuit board is calibrated automatically |
| CN109655654A (en) * | 2019-01-16 | 2019-04-19 | 江苏其厚智能电气设备有限公司 | A kind of Super-Current Measurement method and device based on by-pass shunt technology |
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2020
- 2020-07-02 CN CN202010633025.0A patent/CN113884960A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201364383Y (en) * | 2009-01-12 | 2009-12-16 | 上海市质量监督检验技术研究院 | Automatic metering calibrating device for leakage current instrument |
| CN201654101U (en) * | 2010-04-02 | 2010-11-24 | 浙江省质量技术监督检测研究院 | Low power point detection device of electric toy |
| CN103048530A (en) * | 2011-10-12 | 2013-04-17 | 鸿富锦精密工业（深圳）有限公司 | Current calibration device of digital power supply |
| CN104871027A (en) * | 2012-12-20 | 2015-08-26 | 大陆-特韦斯贸易合伙股份公司及两合公司 | Method for calibrating a current sensor |
| CN203414580U (en) * | 2013-06-24 | 2014-01-29 | 吴锦来 | Precision dual temperature correction circuit of electronic load |
| CN104977451A (en) * | 2014-04-04 | 2015-10-14 | 浙江巨磁智能技术有限公司 | Method of detecting current in a shunting way by current sensor |
| CN107728094A (en) * | 2017-10-23 | 2018-02-23 | 宁德时代新能源科技股份有限公司 | Current calibration coefficient measuring device and method, and current detecting device and method |
| CN109164404A (en) * | 2018-08-10 | 2019-01-08 | 烽火通信科技股份有限公司 | The system and method that sample circuit in circuit board is calibrated automatically |
| CN109655654A (en) * | 2019-01-16 | 2019-04-19 | 江苏其厚智能电气设备有限公司 | A kind of Super-Current Measurement method and device based on by-pass shunt technology |
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