CN201993457U - Automatic calibrating apparatus for shunt - Google Patents
Automatic calibrating apparatus for shunt Download PDFInfo
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- CN201993457U CN201993457U CN201020677574XU CN201020677574U CN201993457U CN 201993457 U CN201993457 U CN 201993457U CN 201020677574X U CN201020677574X U CN 201020677574XU CN 201020677574 U CN201020677574 U CN 201020677574U CN 201993457 U CN201993457 U CN 201993457U
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- shunt
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- comparator
- electric bridge
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Abstract
The utility model relates to an automatic calibrating apparatus for a shunt. A DC (direct current) large-current constant current source is connected with a reverser. An output end of the reverser is respectively connected with the calibrated shunt and a DC comparator bridge through range expanders. A circuit is formed by the DC comparator bridge and the range expanders through a standard resistor. Two DC digital voltmeters respectively carry out voltage sampling on the calibrated shunt and the standard resistor; after being subjected to signal processing and sampling holding, sampled voltages are sent to an ADC (Analog to Digital Converter) to carry out analog-to-digital conversion; then a DSP digital signal processor reads digital quantities and carries out calculation and processing on the digital quantities; and an obtained result is displayed by a display circuit. The automatic calibrating apparatus can be used for directly measuring the calibrated shunt and directly measuring an actual error. The accuracy and the stability of quantity transmission and the working reliability can be ensured.
Description
Technical field
The utility model relates to the shunt application, specifically is a kind of shunt automatic calibrator.
Background technology
Along with rapid development of economy, direct current shunt being applied in various low voltage equipments, the various electrical equipment utensil more and more widely, extensively be penetrated into every field, the demand of the metering that the high-power non-decimal resistance of heavy DC shunt and direct current, high-power measuring resistance are examined and determine, calibrated and the detection of its every performance index is required also more and more higher, demand increases day by day.
The method that shunt is examined and determine that exists at present has voltage/current method (standard mainly adopts heavy DC constant current source and dc digital voltmeter) or simulates the shunt surface temperature with doube bridge (can not reappear actual applying working condition) the direct current shunt is examined and determine.Relatively form by ceremony electric bridge, measuring resistance and current source by DC current for the shunt calibrating installation that exists at present, can't examine and determine the shunt that nominal current surpasses 100A, and electric current can not commutate in verification process, thereby can't eliminate the thermoelectrical potential of measuring the loop, influences accuracy of measurement.
Summary of the invention
At the problems referred to above, the utility model provides under a kind of big current conditions directly and shunt have been carried out whole calibrating, calibration, electric current can commutate, the novel shunt automatic calibrator that improves greatly of precision simultaneously.
The utility model comprises: the D.C. high-current constant current source connects a commutator, the output terminal of commutator connects tested shunt and dc comparator electric bridge respectively by range expander, the dc comparator electric bridge forms the loop through calibration resistor and range expander again, two dc digital voltmeters carry out voltage sampling to tested shunt and calibration resistor respectively, and be delivered to ADC after keeping through signal Processing and sampling and carry out analog to digital conversion, read digital quantity by the DSP digital signal processor again and calculate and handle, show by display circuit again.The big electric current of D.C. high-current constant current source output after commutation, flow through range expander and tested shunt, commutator flows to the dc comparator electric bridge by range expander in proportion with big electric current, thereby be implemented in the commutation of controlling big electric current under the little current status by the dc comparator electric bridge, thermoelectrical potential is to the influence of measurement result under the elimination direct current shunt current state, by certain proportion current signal is formed the loop by measuring resistance again, two digital voltmeters carry out voltage sampling to tested shunt and calibration resistor respectively, carry out analog to digital conversion through delivering to ADC after signal Processing and the sampling again, DSP reads digital quantity and calculates and handle, the final demonstration, realized calibrating to tested shunt.
Preferably, the D.C. high-current constant current source is the constant current switch power supply, and volume is little, in light weight, improves the stability of power supply greatly, reduces the preheating time of power supply, has improved service efficiency.
Preferably, commutator comprises commutation board and controller, and the dc comparator electric bridge rotates by controller control commutation board, realizes commutation, to eliminate the influence of thermoelectrical potential to tested shunt error.
Preferably, described comparator electric bridge is a relatively ceremony electric bridge of QJ55 type DC current.Because QJ55 type current comparator can only be by the following electric current of 100A, and can only detect the resistance of ten multiple, thus be provided with range expander, the scope of expansion electric current, thus the shunt of any resistance can be detected.
Preferably, described range expander is a current comparator formula weight journey extender, and current comparator formula weight journey extender can be formed the detection to D.C. high-current, and have very high accuracy with digital voltmeter, measuring resistance.
Further, be connected with keyboard, be convenient to realize man-machine interaction with the DSP digital signal processor.
The utility model adopts DC current comparator technology, use can constitute as device by the comparator range expander of a few KA DC current, big current reverser, big electric current constant current source, cooperate DC current relatively ceremony electric bridge and measuring resistance use, can make current ratio reach the ppm magnitude, and the commutation of electric current can improve the accuracy of detection/calibration greatly, effectively eliminates the thermoelectrical potential of measuring the loop.Like this, can directly measure tested shunt, directly measure actual error, can guarantee the reliability of accuracy, stability and the work of transmission of quantity value.
Description of drawings
Fig. 1 is the electrical schematic diagram of the utility model embodiment.
Embodiment
Embodiment with indefiniteness further explains, illustrates the technical program below.
A kind of shunt calibrating installation, as shown in Figure 1, comprise D.C. high-current constant current source 1, commutator 2, current comparator formula weight journey extender 3,, tested shunt 4, QJ55 type dc comparator electric bridge 5, calibration resistor 6, two dc digital voltmeters 7 and 8, computing machine 9, display 10 and keyboards 11.Wherein computing machine 9 is used to realize analog to digital conversion and replaces the DSP digital signal processor to calculate and handle.
The big electric current of D.C. high-current constant current source 1 output is through current comparator formula weight journey extender 3 and the tested shunt 4 of flowing through behind the commutator 2, current comparator formula weight journey extender 3 flows to QJ55 type dc comparator electric bridge 5 in proportion with electric current, by certain proportion current signal is formed the loop by measuring resistance 6 again; Commutator comprises commutation board and controller, and the dc comparator electric bridge rotates by controller control commutation board, realizes commutation, and to eliminate the influence of thermoelectrical potential to tested shunt error, for commutator, this is to realize easily, repeats no more; Two dc digital voltmeters 7 and 8 carry out voltage sampling to calibration resistor 6 and tested shunt 4 respectively, and transfer data to computing machine 9, computing machine 9 carries out processing such as analog to digital conversion, data computation, finally shows that by display circuit 10 keyboard 11 is used to realize man-machine interaction.
Claims (6)
1. shunt automatic calibrator, it is characterized in that comprising: the D.C. high-current constant current source connects a commutator, the output terminal of commutator connects tested shunt and direct current comparer electric bridge respectively by range expander, the dc comparator electric bridge forms the loop through calibration resistor and range expander again, two dc digital voltmeters carry out voltage sampling to tested shunt and calibration resistor respectively, and be delivered to ADC after keeping through signal Processing and sampling and carry out analog to digital conversion, read digital quantity by the DSP digital signal processor again and calculate and handle, show by display circuit again.
2. shunt automatic calibrator according to claim 1 is characterized in that: the D.C. high-current source is the constant current switch power supply.
3. shunt automatic calibrator according to claim 1 and 2 is characterized in that: described commutator comprises commutation board and controller, and the dc comparator electric bridge rotates by controller control commutation board.
4. shunt automatic calibrator according to claim 3 is characterized in that: described comparator electric bridge is a relatively ceremony electric bridge of QJ55 type DC current.
5. shunt automatic calibrator according to claim 4 is characterized in that: be connected with keyboard with the DSP digital signal processor.
6. shunt automatic calibrator according to claim 5 is characterized in that: described range expander is a current comparator formula weight journey extender.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020677574XU CN201993457U (en) | 2010-12-24 | 2010-12-24 | Automatic calibrating apparatus for shunt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020677574XU CN201993457U (en) | 2010-12-24 | 2010-12-24 | Automatic calibrating apparatus for shunt |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201993457U true CN201993457U (en) | 2011-09-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201020677574XU Expired - Fee Related CN201993457U (en) | 2010-12-24 | 2010-12-24 | Automatic calibrating apparatus for shunt |
Country Status (1)
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| CN (1) | CN201993457U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105738693A (en) * | 2016-04-08 | 2016-07-06 | 云南省计量测试技术研究院 | Ammeter |
| CN106249186A (en) * | 2016-07-19 | 2016-12-21 | 北京长城华冠汽车科技股份有限公司 | The bearing calibration of a kind of battery management system diverter current acquisition data and device |
| CN106526286A (en) * | 2016-11-11 | 2017-03-22 | 广州极飞科技有限公司 | Current detection circuit, method and cell system |
| CN106908645A (en) * | 2017-02-23 | 2017-06-30 | 国网天津节能服务有限公司 | A kind of method for overcoming direct current energy meter current divider Seebeck effect |
| CN108363029A (en) * | 2018-05-09 | 2018-08-03 | 中国科学院高能物理研究所 | The calibration system and calibration method of DC current sensor |
| CN109444619A (en) * | 2018-12-29 | 2019-03-08 | 国网河北省电力有限公司电力科学研究院 | Direct current current divider detection system |
-
2010
- 2010-12-24 CN CN201020677574XU patent/CN201993457U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105738693A (en) * | 2016-04-08 | 2016-07-06 | 云南省计量测试技术研究院 | Ammeter |
| CN106249186A (en) * | 2016-07-19 | 2016-12-21 | 北京长城华冠汽车科技股份有限公司 | The bearing calibration of a kind of battery management system diverter current acquisition data and device |
| CN106526286A (en) * | 2016-11-11 | 2017-03-22 | 广州极飞科技有限公司 | Current detection circuit, method and cell system |
| CN106526286B (en) * | 2016-11-11 | 2019-07-26 | 广州极飞科技有限公司 | Current detection circuit, method and battery system |
| CN106908645A (en) * | 2017-02-23 | 2017-06-30 | 国网天津节能服务有限公司 | A kind of method for overcoming direct current energy meter current divider Seebeck effect |
| CN108363029A (en) * | 2018-05-09 | 2018-08-03 | 中国科学院高能物理研究所 | The calibration system and calibration method of DC current sensor |
| CN109444619A (en) * | 2018-12-29 | 2019-03-08 | 国网河北省电力有限公司电力科学研究院 | Direct current current divider detection system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110928 Termination date: 20111224 |