CN103033667A - Current measurement device and method - Google Patents
Current measurement device and method Download PDFInfo
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- CN103033667A CN103033667A CN2012105359539A CN201210535953A CN103033667A CN 103033667 A CN103033667 A CN 103033667A CN 2012105359539 A CN2012105359539 A CN 2012105359539A CN 201210535953 A CN201210535953 A CN 201210535953A CN 103033667 A CN103033667 A CN 103033667A
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Abstract
The invention discloses a current measurement device which comprises a hall current sensor, a multi-range hall current sensor, a current conversion device and a current value comparison device. By selecting a range in the multi-range hall current sensor and measuring and obtaining a voltage value which corresponds to a current to be detected, other ranges in the multi-range hall current sensor are converted to be connected with the current to be detected and current value which corresponds to the other ranges, and corresponding current value of all ranges of the multi-range hall current sensor is converted and compares reference current value. The most accurate current value in a proper range is selected as a measurement result. The invention further discloses a current measurement method. By the current measurement device and the method, plugging switching of the measurement current is not needed, the current value of the proper range can be automatically measured by selecting the range randomly, and the current measurement is intelligentized.
Description
Technical field
The present invention relates to electronic information field, particularly relate to a kind of current measuring device and method.
Background technology
Current parameters is one of important parameter of electronic devices and components test, and it is realized measuring is the basic link of realizing monitoring.Utilizing Hall element to measure DC current is a kind of non-contact electric current measurement mode of relatively commonly using.
The device of general measurement electric current need to be selected a suitable range when utilizing Hall element to measure, to obtain more accurate measured value, if also have than the range of access measurement more during accurate range, often need again to change a more accurate range, the user often needs to obtain first measurement result, then judge whether that according to measurement result the range that accesses is best range, if not, also need the user again to connect to change range to measure again, the time cycle that repeated measurement selects suitable range to cause the user to obtain the precision current value of oneself needs is elongated greatly, simultaneously so that the operation more complicated of current measurement is intelligent not.
Summary of the invention
Based on this, be necessary for the complicated problem of existing current measuring device operation, a kind of current measuring device and method that can automatic conversioning broad be provided.
A kind of current measuring device comprises Hall current sensor, multirange Hall current sensor, electric current scaler and current value comparison device;
The range of described Hall current sensor is the maximum range of described current measuring device, and electric current to be measured converts voltage to by described Hall current sensor;
Described multirange Hall current sensor comprises two or more ranges, electric current to be measured converts corresponding voltage to by the corresponding range in the described multirange Hall current sensor, described multirange Hall current sensor interior loop and described Hall current sensor interior loop are connected in parallel, use in the described multirange Hall current sensor arbitrarily range to treat to survey electric current when measuring, electric current to be measured is by described Hall current sensor, if electric current to be measured is measured by described Hall current sensor, then electric current to be measured only passes through described Hall current sensor;
Described electric current scaler is converted into current value according to Hall effect with the size of described voltage, described Hall current sensor converts current value that the size of voltage is converted into to as reference current value, if connecting described Hall current sensor, measures in electric current to be measured, then obtain the voltage corresponding with electric current to be measured, obtain the current value of electric current to be measured according to direct conversion of Hall effect, if using in the described multirange Hall current sensor arbitrarily range to treat to survey electric current measures, the current value of described each range of multirange Hall current sensor of large young pathbreaker that described electric current scaler is also exported described voltage according to described multirange Hall current sensor during by electric current to be measured converts out;
Described current value comparison device is compared described electric current scaler described each range of multirange Hall current sensor of obtaining current value and described reference current value during by electric current to be measured that convert, the current value of selecting the current value conduct near described reference current value to measure.
Therein among embodiment, described current measuring device, also comprise the outrange judgment means, when described outrange judgment means exceeded corresponding connection range for the current value that converts out when the electric current scaler, described outrange judgment means judged that electric current to be measured connects outrange.
Therein among embodiment, described automatic range switching current measurement mechanism, two or more ranges in the range of described Hall current sensor and the described multirange Hall current sensor successively decrease successively with the prearranged multiple relation.
Therein among embodiment, described automatic range switching current measurement mechanism, the range that described Hall current sensor is measured electric current is 50A.
Therein among embodiment, described automatic range switching current measurement mechanism, described prearranged multiple is 5 times.
A kind of current measuring method comprises step:
Preset the range of Hall current sensor and multirange Hall current sensor, and to set described Hall current sensor range be maximum range, described multirange Hall current sensor has two or more ranges, described multirange Hall current sensor interior loop and described Hall current sensor interior loop are connected in parallel, connect any range and treat and survey electric current and measure;
If connecting described Hall current sensor, measures in electric current to be measured, then obtain the voltage corresponding with electric current to be measured, obtain the current value of electric current to be measured according to direct conversion of Hall effect, any range is measured if electric current to be measured connects described multirange Hall current sensor, the magnitude of voltage when then obtaining electric current to be measured and connecting corresponding voltage value that any range of described multirange Hall current sensor measures and electric current to be measured through described Hall current sensor;
According to the convert current value of the current value draw the electric current to be measured by described Hall current sensor and the range by described multirange Hall current sensor connection of Hall effect, the current value that the described Hall current sensor that conversion is drawn is measured is as reference current value, and connects the current value that magnitude of voltage that any range of described multirange Hall current sensor obtains converses the electric current to be measured that each range passes through in the described multirange Hall current sensor according to electric current to be measured;
Current value and the described reference current value of the electric current to be measured that each range passes through in the described multirange Hall current sensor that conversion is drawn are compared, and select current value near described reference current value as the current value that measures.
Therein among embodiment, described current measuring method, when described corresponding current value and described reference current value are compared, also comprise step: when the current value that converts out when the electric current scaler exceeded corresponding connection range, described outrange judgment means judged that electric current to be measured connects outrange.
Therein among embodiment, described current measuring method, range and two or more ranges in the described multirange Hall current sensor of setting described Hall current sensor successively decrease successively with the prearranged multiple relation.
Therein among embodiment, described current measuring method, it is 50A that the maximum of determining to measure electric current is measured range.
Among embodiment, described current measuring method determines that described prearranged multiple is 5 times therein.
Above-mentioned current measuring device and method, be connected in parallel by multirange Hall current sensor interior loop and described Hall current sensor interior loop, so that electric current to be measured is when selecting in the described multirange Hall current sensor that range is measured arbitrarily, electric current to be measured is through described Hall current sensor.Any range is measured if electric current to be measured connects described multirange Hall current sensor, magnitude of voltage when then measuring electric current to be measured and connecting magnitude of voltage that any range of described multirange Hall current sensor measures and electric current to be measured through described Hall current sensor, convert according to Hall effect and obtain the current value that corresponding current value under each range of multirange Hall current sensor and described Hall current sensor measure, the current value that the described Hall current sensor that conversion is drawn is measured is as reference current value.By the current value comparison device, select near the current value of described reference current value as the current value of measuring electric current to be measured and obtaining, when if electric current to be measured selects described Hall current sensor to measure, electric current to be measured only passes through described Hall current sensor, directly measure magnitude of voltage, obtain current value through converting.By selecting multirange one of them range of Hall current sensor and measuring its magnitude of voltage corresponding with electric current to be measured, if conversing other range of described multirange Hall current sensor connects again, current value corresponding to other ranges then, the corresponding current value and the reference current value that converse under described each range of multirange Hall current sensor are compared, select the most accurate current value under the suitable range as measurement result, the plug that does not need to carry out between range is switched, so that current measurement is more intelligent.
Description of drawings
Fig. 1 is the device connection layout of a wherein embodiment of current measuring device of the present invention and method;
Fig. 2 is the wherein figure that is connected in parallel of an embodiment of the Hall current sensor interior loop of current measuring device of the present invention and method and multirange Hall current sensor interior loop;
Fig. 3 is the wherein method flow diagram of an embodiment of current measuring device of the present invention and method.
Embodiment
Hall element improves the input turn ratio in input circuit, can improve the sampling precision of output current.Therefore in the input circuit of a Hall element, when the different number of turn, can obtain different ranges.Have this as seen in determining the Hall element input circuit of specification around coil turn more, the range that then Hall element is corresponding is less, and is simultaneously also more accurate.Electric current to be measured is responded to by Hall current sensor by coil, the magnitude of voltage that corresponding output is corresponding with measuring electric current, the measurement current value that is converted into electric current to be measured that this magnitude of voltage can be corresponding according to Hall effect.
As described in Figure 1, a kind of current measuring device comprises Hall current sensor 110, multirange Hall current sensor 120, electric current scaler 130 and current value comparison device 140;
The range of described Hall current sensor 110 is the maximum range of described current measuring device, and electric current to be measured converts voltage to by described Hall current sensor 110; Hall current sensor 110 in the present embodiment is selected according to the concrete measurement situation of electric current to be measured, and the range that described Hall current sensor 110 can detect is the maximum range of current measuring device, guarantee that electric current to be measured can outrange by described Hall current sensor 110, so that the current value that described Hall current sensor 110 measures is as reference current value.
Described multirange Hall current sensor 120 comprises two or more ranges, electric current to be measured converts corresponding voltage to by the corresponding range in the described multirange Hall current sensor 120, described multirange Hall current sensor 120 interior loop and described Hall current sensor 110 interior loop are connected in parallel, use in the described multirange Hall current sensor 120 arbitrarily range to treat to survey electric current when measuring, electric current to be measured is by described Hall current sensor 110, if electric current to be measured selects described Hall current sensor 110 to measure, then electric current to be measured only passes through described Hall current sensor 110.Described multirange Hall current sensor 120 ranges are determined by the coil turn on sensor.Utilize two or more varying number coil turns to be around on the described multirange Hall current sensor 120 in the present embodiment, separate unaffected between the coil, form the multirange Hall current sensor 120 of two or more different ranges.As shown in Figure 2, be respectively the multirange Hall current sensor of 10A and 2A as example take two ranges, be connected in parallel in coil in the multirange Hall current sensor and the Hall current sensor coil, when guaranteeing that range is measured arbitrarily in the electric current access multirange Hall current sensor to be measured, electric current to be measured must pass through Hall current sensor, be that electric current to be measured connects when range is measured arbitrarily in the multirange Hall current sensor, an electric current to be measured that can access the measurement of multirange Hall current sensor accesses magnitude of voltage and the Hall current sensor of measuring transmission under the range and measures the magnitude of voltage that transmits.
Described electric current scaler 130 is converted into current value according to Hall effect with the size of described voltage, the current value that the size that described Hall current sensor 110 converts voltage to is converted into is as reference current value, if connecting described Hall current sensor 110, measures in electric current to be measured, then obtain the voltage corresponding with electric current to be measured, obtain the current value of electric current to be measured according to direct conversion of Hall effect, if using in the described multirange Hall current sensor 120 arbitrarily range to treat to survey electric current measures, also the current value during by electric current to be measured converts out described electric current scaler 130 according to described multirange Hall current sensor 120 each ranges of large young pathbreaker of the described voltage of described multirange Hall current sensor 120 outputs; By Hall current sensor 110 and the corresponding magnitude of voltage of multirange Hall current sensor 120 electric currents that measure and to be measured, be converted into corresponding current value by Hall effect again, electric current access multirange Hall current sensor 120 any ranges to be measured obtain the output voltage values corresponding with accessing range, by Hall effect and multirange Hall current sensor 120 other ranges around coil turn, can access the current value that other ranges obtain by the corresponding electric current to be measured that converses.
Described current value comparison device 140 is compared convert current value and the described reference current value of the electric current to be measured that each range passes through in the described multirange Hall current sensor 120 that obtains of described electric current scaler 130, the current value of selecting the current value conduct near described reference current value to measure; Described reference current value is the current value that maximum range detects the electric current to be measured that obtains, each range is all less than the range of Hall element in the multirange Hall current sensor 120, and the current value that the relatively little detection of range obtains must be the current value degree of accuracy height that gets than the relatively large detection of range, therefore, the corresponding current value of each range is compared with reference current value through converting out in the multirange Hall current sensor 120, with the current value that obtains as final detection near the corresponding current value of described reference current value.
A kind of current measuring method comprises step:
Step S210, preset the range of Hall current sensor and multirange Hall current sensor, and to set described Hall current sensor range be maximum range, described multirange Hall current sensor has two or more ranges, described multirange Hall current sensor interior loop and described Hall current sensor interior loop are connected in parallel, connect any range and treat and survey electric current and measure.The range of Hall current sensor and multirange Hall current sensor is selected suitable range according to concrete measurement situation in the present embodiment, the range that described Hall current sensor can detect is the maximum range of current measuring device, guarantee that electric current to be measured can outrange in measuring electric current process to be measured by described Hall current sensor, so that the current value that described Hall current sensor measures is as reference current value.Utilize two or more varying number coil turns to be around on the described multirange Hall current sensor in the present embodiment, separate unaffected between the coil, the multirange Hall current sensor that forms two or more different ranges is connected in parallel described multirange Hall current sensor interior loop and described Hall current sensor interior loop.When any range that connects described multirange Hall current sensor is measured, electric current to be measured is by described multirange Hall current sensor the time, also pass through Hall current sensor, if when connecting described Hall current sensor and measuring, electric current to be measured only passes through described Hall current sensor.
Step S220, if connecting described Hall current sensor, measures in electric current to be measured, then obtain the voltage corresponding with electric current to be measured, obtain the current value of electric current to be measured according to direct conversion of Hall effect, any range is measured if electric current to be measured connects described multirange Hall current sensor, the magnitude of voltage when then obtaining electric current to be measured and connecting corresponding voltage value that any range of described multirange Hall current sensor measures and electric current to be measured through described Hall current sensor.
Step S230, according to the convert current value of the current value draw the electric current to be measured by described Hall current sensor and the range by described multirange Hall current sensor connection of Hall effect, the current value that the described Hall current sensor that conversion is drawn is measured is as reference current value, and connects the current value that magnitude of voltage that any range of described multirange Hall current sensor obtains converses the electric current to be measured that each range passes through in the described multirange Hall current sensor according to electric current to be measured.The magnitude of voltage corresponding with electric current to be measured that measures with the multirange Hall current sensor by Hall current sensor, be converted into corresponding current value by Hall effect again, the any range of electric current access multirange Hall current sensor to be measured obtains the output voltage values corresponding with accessing range, by Hall effect and other ranges of multirange Hall current sensor around coil turn, can access the current value that other ranges obtain by the corresponding electric current to be measured that converses.
Step S240, current value and the described reference current value of the electric current to be measured that each range passes through in the described multirange Hall current sensor that conversion is drawn are compared, and select current value near described reference current value as the current value that measures.If any range of electric current access multirange Hall current sensor to be measured is measured, conversion obtains the current value of each range of multirange Hall current sensor corresponding to electric current to be measured, only needing converts obtains the current value that electric current to be measured accesses the electric current to be measured of described one of them range of multirange Hall current sensor, can obtain by conversion the current value of the electric current to be measured under each range measurement.The current value and the described reference current value that obtain by conversion are compared again, and are the measured value of the electric current to be measured under the suitable range near the current value of the current value of reference current value.If electric current access journey Hall current sensor to be measured is measured, the current value to be measured under the Hall current sensor range that then conversion is obtained is as the measured value of the electric current to be measured under the suitable range.
Above-mentioned current measuring device and method, be connected in parallel by multirange Hall current sensor interior loop and described Hall current sensor interior loop, so that electric current to be measured is when selecting in the described multirange Hall current sensor that range is measured arbitrarily, electric current to be measured is through described Hall current sensor.Any range is measured if electric current to be measured connects described multirange Hall current sensor, magnitude of voltage when then measuring electric current to be measured and connecting magnitude of voltage that any range of described multirange Hall current sensor measures and electric current to be measured through described Hall current sensor, convert according to Hall effect and obtain the current value that corresponding current value under each range of multirange Hall current sensor and described Hall current sensor measure, the current value that the described Hall current sensor that conversion is drawn is measured is as reference current value.By the current value comparison device, select near the current value of described reference current value as the current value of measuring electric current to be measured and obtaining, when if electric current to be measured selects described Hall current sensor to measure, electric current to be measured only passes through described Hall current sensor, directly measure magnitude of voltage, obtain current value through converting.By selecting multirange one of them range of Hall current sensor and measuring its magnitude of voltage corresponding with electric current to be measured, if conversing other range of described multirange Hall current sensor connects again, current value corresponding to other ranges then, the corresponding current value and the reference current value that converse under described each range of multirange Hall current sensor are compared, select the most accurate current value under the suitable range as measurement result, the plug that does not need to carry out between range is switched, so that current measurement is more intelligent.
Therein among embodiment, described current measuring device, also comprise the outrange judgment means, when described outrange judgment means exceeded corresponding connection range for the current value that converts out when the electric current scaler, described outrange judgment means judged that electric current to be measured connects outrange.Whether the electric current to be measured of judging that can be instant by the outrange judgment means exceeds the measurement range of multirange sensor.
Among embodiment, two or more ranges in the range of described Hall current sensor and the described multirange Hall current sensor successively decrease successively with the prearranged multiple relation therein.The range that described Hall current sensor is measured electric current is 50A, and wherein prearranged multiple is preferred 5 times.For the ease of understanding, now describe as an example of Hall current sensor and the multirange Hall current sensor that comprises two ranges example, the range of selecting described Hall current sensor to measure electric current is 50A, and then the range of corresponding multirange Hall current sensor is respectively 10A and 2A.The place is measured if electric current to be measured accesses described Hall current sensor 50A range, and then the Hall current sensor correspondence is exported the magnitude of voltage corresponding with electric current to be measured, converses the current value to be measured of measurement through excess current scaler 130.If want to obtain more accurate current measurement value to be measured, being about to 10A range or 2A range that electric current to be measured accesses arbitrarily in the multirange Hall current sensor measures, if electric current to be measured is by in the multirange Hall current sensor during 10A range, the magnitude of voltage of exporting when then obtaining electric current to be measured by multirange Hall current sensor 10A range, by this magnitude of voltage according to Hall effect corresponding extrapolate the conversion current value that electric current to be measured connects the 2A range, be converted into corresponding current value by the electric current scaler, for example, when electric current to be measured is 5A, described Hall current sensor correspondence measures a value that is about 5A, measured value under 10 ranges that the multirange Hall current sensor measures is about 5A, and the measured value under the 2A range is because 5A exceeds the measurement range of 2A range, then the electric current estimation device is extrapolated the current value to be measured of measuring under the 2A range according to Hall effect and is about 25A, current value and described reference current value that described multirange Hall current sensor is corresponding with each range are compared, and select the current value measured under the 10A range near described reference current value as the current value of electric current to be measured.When if electric current to be measured is 1A, described Hall current sensor correspondence measures a value that is about 1A, measured value under 10 ranges that the multirange Hall current sensor measures is about 1A, and the measured value under the 2A range is about 1A, because the measuring accuracy of 2A range is higher than the measuring accuracy of 10A range, current value and described reference current value that described multirange Hall current sensor is corresponding with each range are compared, and select the current value measured under the 2A range near described reference current value as the current value of electric current to be measured.
The above embodiment has only expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to claim of the present invention.Should be pointed out that for the person of ordinary skill of the art without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (10)
1. a current measuring device is characterized in that, comprises Hall current sensor, multirange Hall current sensor, electric current scaler and current value comparison device;
The range of described Hall current sensor is the maximum range of described current measuring device, and electric current to be measured converts voltage to by described Hall current sensor;
Described multirange Hall current sensor comprises two or more ranges, electric current to be measured converts corresponding voltage to by the corresponding range in the described multirange Hall current sensor, described multirange Hall current sensor interior loop and described Hall current sensor interior loop are connected in parallel, use in the described multirange Hall current sensor arbitrarily range to treat to survey electric current when measuring, electric current to be measured is by described Hall current sensor, if electric current to be measured is measured by described Hall current sensor, then electric current to be measured only passes through described Hall current sensor;
Described electric current scaler is converted into current value according to Hall effect with the size of described voltage, described Hall current sensor converts current value that the size of voltage is converted into to as reference current value, if connecting described Hall current sensor, measures in electric current to be measured, then obtain the voltage corresponding with electric current to be measured, obtain the current value of electric current to be measured according to direct conversion of Hall effect, if using in the described multirange Hall current sensor arbitrarily range to treat to survey electric current measures, the current value of described each range of multirange Hall current sensor of large young pathbreaker that described electric current scaler is also exported described voltage according to described multirange Hall current sensor during by electric current to be measured converts out;
Described current value comparison device is compared described electric current scaler described each range of multirange Hall current sensor of obtaining current value and described reference current value during by electric current to be measured that convert, the current value of selecting the current value conduct near described reference current value to measure.
2. current measuring device according to claim 1, it is characterized in that, also comprise the outrange judgment means, when described outrange judgment means exceeded corresponding connection range for the current value that converts out when the electric current scaler, described outrange judgment means judged that electric current to be measured connects outrange.
3. automatic range switching current measurement mechanism according to claim 1 and 2 is characterized in that, two or more ranges in the range of described Hall current sensor and the described multirange Hall current sensor successively decrease successively with the prearranged multiple relation.
4. automatic range switching current measurement mechanism according to claim 1 and 2 is characterized in that, the range that described Hall current sensor is measured electric current is 50A.
5. automatic range switching current measurement mechanism according to claim 3 is characterized in that, described prearranged multiple is 5 times.
6. a current measuring method is characterized in that, comprises step:
Preset the range of Hall current sensor and multirange Hall current sensor, and to set described Hall current sensor range be maximum range, described multirange Hall current sensor has two or more ranges, described multirange Hall current sensor interior loop and described Hall current sensor interior loop are connected in parallel, connect any range and treat and survey electric current and measure;
If connecting described Hall current sensor, measures in electric current to be measured, then obtain the voltage corresponding with electric current to be measured, obtain the current value of electric current to be measured according to direct conversion of Hall effect, any range is measured if electric current to be measured connects described multirange Hall current sensor, the magnitude of voltage when then obtaining electric current to be measured and connecting corresponding voltage value that any range of described multirange Hall current sensor measures and electric current to be measured through described Hall current sensor;
According to the convert current value of the current value draw the electric current to be measured by described Hall current sensor and the range by described multirange Hall current sensor connection of Hall effect, the current value that the described Hall current sensor that conversion is drawn is measured is as reference current value, and connects the current value that magnitude of voltage that any range of described multirange Hall current sensor obtains converses the electric current to be measured that each range passes through in the described multirange Hall current sensor according to electric current to be measured;
Current value and the described reference current value of the electric current to be measured that each range passes through in the described multirange Hall current sensor that conversion is drawn are compared, and select current value near described reference current value as the current value that measures.
7. current measuring method according to claim 6, it is characterized in that, when described corresponding current value and described reference current value are compared, also comprise step: when the current value that converts out when the electric current scaler exceeded corresponding connection range, described outrange judgment means judged that electric current to be measured connects outrange.
8. according to claim 6 or 7 described current measuring methods, it is characterized in that range and two or more ranges in the described multirange Hall current sensor of setting described Hall current sensor successively decrease successively with the prearranged multiple relation.
9. according to claim 6 or 7 described current measuring methods, it is characterized in that it is 50A that the maximum of determining to measure electric current is measured range.
10. current measuring method according to claim 8 is characterized in that, determines that described prearranged multiple is 5 times.
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| CN104977459A (en) * | 2015-07-15 | 2015-10-14 | 威胜集团有限公司 | Current detection device, electric energy meter made by device and metering method thereof |
| CN105510686A (en) * | 2015-12-11 | 2016-04-20 | 谭焕玲 | Current measurement apparatus and method |
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| CN110286257A (en) * | 2019-06-20 | 2019-09-27 | 西安易朴通讯技术有限公司 | Electric current detecting method and device, electronic equipment and computer readable storage medium |
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| CN114355006A (en) * | 2021-12-30 | 2022-04-15 | 合肥综合性国家科学中心能源研究院(安徽省能源实验室) | Device for automatically switching magnetic leakage detection range |
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| CN111458555A (en) * | 2020-06-08 | 2020-07-28 | 南方电网科学研究院有限责任公司 | Combined all-fiber current measurement system and current measurement method |
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| CN114355006A (en) * | 2021-12-30 | 2022-04-15 | 合肥综合性国家科学中心能源研究院(安徽省能源实验室) | Device for automatically switching magnetic leakage detection range |
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