CN116027090A - Method for realizing stable resistance value of shunt - Google Patents
Method for realizing stable resistance value of shunt Download PDFInfo
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- CN116027090A CN116027090A CN202111244632.9A CN202111244632A CN116027090A CN 116027090 A CN116027090 A CN 116027090A CN 202111244632 A CN202111244632 A CN 202111244632A CN 116027090 A CN116027090 A CN 116027090A
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- temperature
- shunt
- fan
- detection module
- control module
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- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000001514 detection method Methods 0.000 claims abstract description 11
- 230000007613 environmental effect Effects 0.000 claims 1
- 230000000087 stabilizing effect Effects 0.000 abstract description 4
- 238000005259 measurement Methods 0.000 description 3
- 229910000078 germane Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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Abstract
The invention discloses a realization method for stabilizing the resistance of a shunt, which comprises the shunt, a fan module, a temperature detection module, a temperature reference and a control module; the temperature detection module is close to the temperature detection module, the air quantity of the fan can flow through the surface of the radiator of the air flow divider or the accessory thereof, the output of the temperature detection module and the temperature reference are used as the input of the control module, and the output of the control module controls the rotating speed of the fan. By stabilizing the temperature of the shunt at a relatively high, but deterministic value, the temperature drift of the shunt is eliminated or reduced, thereby reducing the resistance change of the shunt.
Description
Technical Field
The invention relates to a realization method for stabilizing the resistance of a shunt.
Background
High-precision high-current measurement has great challenges in the fields of Battery Management Systems (BMS), battery formation components, instruments and meters, and the like.
The detection of the current is carried out in a relatively economical and applicable mode, and the current is indirectly measured by a SHUNT (SHUNT); the shunt is a high-precision resistor, has high precision and can pass large current for a long time; when the loop is connected, the voltage of millivolt level can be measured at the two ends of the shunt, and the voltage of the shunt end is measured by using a high-precision voltmeter, so that the current value can be obtained through ohm law.
The current accuracy of the current divider with a general structure is higher when the current divider is used for measuring a low-power loop, but the accuracy of measuring a high current is greatly reduced; the main factors affecting accuracy are temperature, including ambient temperature, and also including the shunt itself, and when a large current is passed, the temperature rise caused by ohmic heat of the resistor affects the resistance, and the resistance changes with temperature change, i.e. temperature drift.
Temperature drift can be described by a temperature coefficient of resistance TCR (temperature coefficient of resistance), which represents the relative change in resistance in ppm/°c or ppm/K when the temperature is changed by 1 ℃; the temperature coefficient of resistance of the relatively high-end shunt is + -50 ppm/deg.C, so that an error of over five parts per million is generated by a temperature rise of 10 deg.C.
In the measurement step, the linearity error can be eliminated by checking, but the TCR of the shunt is nonlinear, and if the piecewise check is performed, a great deal of effort is added.
Disclosure of Invention
The invention relates to a novel high-stability shunt realization method; according to the method, the influence of ambient temperature and passing current on the resistance of the shunt can be eliminated, so that after verification, a determined resistance is calibrated, and high-precision current measurement is realized.
The invention eliminates the resistance change caused by temperature drift generated by the environment and the heating of the resistor by controlling the temperature of the shunt at a relatively high fixed value.
Drawings
FIG. 1 is a schematic diagram of the assembly of various components of a constant diverter temperature.
The invention will be further described with reference to the drawings and examples.
An implementation of a constant shunt temperature.
Detailed Description
Hereinafter, some embodiments of the present disclosure will be described in detail with reference to the attached illustrative drawings. Where elements of the drawings are designated by reference numerals, the same elements will be designated by the same reference numerals although the same elements are illustrated in different drawings. Further, in the following description of the present disclosure, a detailed description of known functions and configurations incorporated herein will be omitted where it may make the subject matter of the present disclosure unclear.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used herein, the singular is intended to include the plural unless the context indicates otherwise. It will be further understood that the terms "comprises," "comprising," "includes," and/or "having," when used in this specification, are intended to specify the presence of stated features, entities, operations, and/or components, but do not preclude the presence or addition of one or more other features, entities, operations, and/or components.
Unless defined otherwise, all terms including technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this inventive concept belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure. The present disclosure may be practiced without some or all of these specific details. In other instances, only components that are germane to schemes according to the present disclosure have been shown in the drawings, while other details that are not germane to the present disclosure have been omitted in order to avoid obscuring the present disclosure with unnecessary detail.
The core idea of the disclosed technology is to detect the temperature of the shunt during operation, thereby controlling a fan in a closed loop, stabilizing the temperature of the shunt body at a relatively high but constant temperature, and eliminating the temperature drift of the shunt resistance.
The invention is further described below with reference to the drawings and detailed description.
As shown in fig. 1, the implementation of the present invention includes a general shunt 100, a circuit board 101, a fan 102, a temperature detection module 103, a temperature reference 104, and a control module 1056. The circuit board 101 provides mounting support for other components, and the air volume generated by the fan can flow through the splitter 100, and the temperature detection module 103 is as close to the splitter 100 as possible. If the fan 102 is operating at full speed, the current through the shunt 100 is at a maximum, the ambient temperature is at a maximum, the temperature sensing module 103 tests the temperature at that time, assuming T0, then the temperature reference is set to a value higher than T0, such as T1, and the control module 105 compares the temperature sensing module 103 reading to T1, and the fan 102 speed is closed loop controlled to stabilize the separator temperature at a constant temperature. Because T1 is greater than T0, fan 102 may need to be operated at all times, adjusting the output power according to operating conditions. The minimum rotational speed of the fan (which may be stalling) is thus such that a minimum current (e.g. 0) can be passed through the shunt, and the minimum ambient temperature, the temperature sensing module reading will still be stable at T1.
Because the temperature of the shunt 100 is a fixed value under any operating conditions, the resistance will not drift with the environment and operating conditions.
While the disclosure has been disclosed by the foregoing description of specific embodiments thereof, it will be understood that various modifications, improvements, or equivalents may be devised by those skilled in the art that will fall within the spirit and scope of the appended claims. Such modifications, improvements, or equivalents are intended to be included within the scope of this disclosure.
Claims (4)
1. The realization method of the stable resistance value of the current divider comprises the current divider, a fan, a temperature detection module and a temperature reference and control module; the temperature detection module is close to the flow divider, the air quantity of the fan can flow through the surface of the flow divider, the output of the temperature detection module and the temperature reference are used as the input of the control module, and the output of the control module controls the fan.
2. The method of claim 1, wherein the control module controls the rotation speed of the fan according to the measured result of the temperature detection module, so that the temperature of the shunt can be stabilized at a determined temperature or the temperature variation range is less than 10 ℃.
3. The method of claim 1, wherein the stable temperature of the shunt can be different determined values under different working environments when the environmental conditions are complex.
4. The method of claim 1, wherein the radiator is attached to the shunt, the air flow of the fan flows over the surface of the radiator, and the temperature of the shunt is indirectly changed by the radiator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111244632.9A CN116027090A (en) | 2021-10-26 | 2021-10-26 | Method for realizing stable resistance value of shunt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111244632.9A CN116027090A (en) | 2021-10-26 | 2021-10-26 | Method for realizing stable resistance value of shunt |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116027090A true CN116027090A (en) | 2023-04-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111244632.9A Pending CN116027090A (en) | 2021-10-26 | 2021-10-26 | Method for realizing stable resistance value of shunt |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116027090A (en) |
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2021
- 2021-10-26 CN CN202111244632.9A patent/CN116027090A/en active Pending
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Effective date of registration: 20240222 Address after: 518000 Building G5-902, Haiyu Xiwan, Haoye Community, Xixiang Street, Bao'an District, Shenzhen City, Guangdong Province, China Applicant after: Shenzhen Chaoda Investment Partnership (Limited Partnership) Country or region after: China Address before: 518101 Chuangwei Innovation Valley 2 # B1331, No. 8 Tangtou 1st Road, Tangtou Community, Shiyan Street, Bao'an District, Shenzhen City, Guangdong Province Applicant before: Shenzhen Liuying Electric Technology Co.,Ltd. Country or region before: China |