CN1353818A - Current metering sensor - Google Patents
Current metering sensor Download PDFInfo
- Publication number
- CN1353818A CN1353818A CN00808302A CN00808302A CN1353818A CN 1353818 A CN1353818 A CN 1353818A CN 00808302 A CN00808302 A CN 00808302A CN 00808302 A CN00808302 A CN 00808302A CN 1353818 A CN1353818 A CN 1353818A
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- China
- Prior art keywords
- hall element
- conductor
- current
- metering sensor
- current metering
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
- G01R15/202—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices using Hall-effect devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/32—Compensating for temperature change
Abstract
The invention relates to a current meter which is based on the principle of surface field measurement. Hall sensors (1) are used which are arranged in such a way, that they are excited by a magnetic field which is proportional to the current. Two Hall sensors are arranged in such a way, that they detect the field to be measured quantitatively in a uniform manner, but with opposing polarity signs. By subtracting the output signals from the Hall sensors, the measured value of the current is amplified, whilst external parasitic induction is eliminated.
Description
The present invention relates to current metering sensor, it is used for measuring higher DC current discretely at the energy distribution equipment current potential that has up to the rated voltage of several kV.For example can in the overcurrent relay of DC quick switch, use this survey sensor.
Up to the present, streaming buffer amplifier, the measurement mechanism with FERRITE CORE and Hall element and LEM transducer are used for the measurement of electric current.These known devices have significant disadvantage.
For example the electric current that must measure under the situation by means of the current measurement of shunt resistance conducts by measuring resistance, and measures the voltage drop that causes by electric current.Measurement by this form consumes unnecessary energy, and this helps warming of switch environment.This current measuring device is integrated in the loop that must measure necessarily in addition, and therefore the necessary electric current of measuring of influence itself has distorted measurement more or less by the numerical value of shunt resistance thus.The measurement that current potential separates under high-tension situation in this manner is impossible in addition.
In the LEM transducer,, measure its electric current around the conductor arrangement FERRITE CORE.Arrange one second coil around this FERRITE CORE, by this coil Control current like this, the magnetic field that causes is aligned to zero.Though can measure discretely by current potential in this manner, but the expense that this mode is measured is high.
Relatively advantageously measure magnetic field by means of Hall element under the situation of Hall effect utilizing.Hall element produces the voltage that is proportional to magnetic field, and this action of a magnetic field is in Hall element.This Hall effect appears in the material varying strength ground that depends on application, and the most useful is the Hall element that is formed by semiconductor.Therefore can measure magnetic field by Hall element, this magnetic field is by the induction by current of the conductor of flowing through.Realize the current measurement that current potential separates in such a way.
Because the voltage that produces by Hall element when measuring is low, and magnetic field suffers external action under normal operation, and the amplification in magnetic field is necessary, realizes this amplification by iron oxygen topic magnetic core under normal conditions.The saturated relation according to the FERRITE CORE of using occurs non-linear in this device.This causes this shortcoming, only can enough measure electric current exactly in the scope of determining restriction, and the electric current of measuring according to saturated relation outside this scope significantly departs from actual current.Expense according to this measurement mechanism of FERRITE CORE is high relatively in addition.
Summarize to get up to have this shortcoming according to this device of technology status, non-linear according to saturated relation appearance, this device only has limited compressive resistance, and this device causes high relatively expense and has high itself consuming in addition.
Therefore the present invention is based on this task, set up a low-cost current metering sensor, its current potential detects current value discretely, has enough accuracys and has anti-interference widely.
Solve this task by the current metering sensor of in the claim 1 of enclosing, setting forth.That is to say that current metering sensor according to the present invention has at least two Hall elements that are arranged on the conductor.So arrange this Hall element, promptly detect the magnetic field that the electric current by the conductor of flowing through produces on its numerical value in the same manner and quantitatively detect interference field in the same manner, and with different respectively symbol detection or magnetic field or interference field.
Set forth other expansion in the dependent claims.
Corresponding therewith or by addition or by subtraction amplified current measured value, eliminated interference field according to the disturbing effect of outside.
Realize in useful mode by current metering sensor according to the present invention, can the cost lowland implement current value and detect, because do not need the FERRITE CORE of adding.Can realize anti-interference and high insulation voltage widely to this.
Can obtain to be suitable for the current metering sensor of simple electronics release in such a way in the direct current scope according to the present invention, this sensor detects current value discretely for the DC voltage current potential up to 4kV.
Describe the present invention with reference to the accompanying drawings in detail according to embodiment below.Diagram:
Fig. 1 has pointed out to have the diagram description according to the overcurrent relay of first embodiment, installation current metering sensor on the line,
Fig. 2 has pointed out the part figure according to the amplification of the explanation of the Fig. 1 that points out current metering sensor in detail,
Fig. 3 has pointed out the current metering sensor according to second embodiment,
Fig. 4 pointed out according to the block scheme of the evaluation circuit of the current metering sensor of first or second embodiment and
Fig. 5 has pointed out according to the 3rd embodiment, has had the block scheme of evaluation circuit of the current metering sensor of four Hall elements.
Fig. 1 has pointed out to describe according to the diagram of the overcurrent relay of first embodiment.Overcurrent relay has basic switch BS and arc-extinguishing system LS, is unessential to its accurate function of this embodiment, therefore cancels its accurate explanation.
A current metering sensor SMA is installed on circuit 2.Principle or Hall effect that this current metering sensor SMA measures based on surface field.
This current metering sensor SMA according to first embodiment describes in detail in Fig. 2.These two Hall element 1a and 1b are arranged on the part of conductor 2 relative to one another.
Use two Hall element 1a and 1b,, and owing to the disturbing effect of environment, that is to say that interference field disturbs this magnetic field because magnetic field is weak relatively.So arrange this two Hall element 1a and 1b in order to eliminate this outside disturbing effect, promptly two Hall elements are measured in the same manner because electric current by the numerical value in the magnetic field of generation, is measured magnetic field respectively with reciprocal symbol.If the numerical value in the magnetic field that is produced by the electric current of the conductor 2 of flowing through is B, then Hall element 1a for example measures magnetic field+B, and Hall element 1b measures magnetic field-B.
Signal subtraction from two Hall element 1a and 1b output.From output signal, eliminate interference field thus, amplify the measured value in magnetic field.Therefore this needn't, by means of amplifying magnetic field, because eliminated interference field widely and produced the powerful measuring-signal in the magnetic field that must measure by subtracting each other of signal such as FERRITE CORE according to technology status.
Represent the measured value of Hall element 1a with MW1a, represent the measured value of Hall element 1b with MW1b.If almost arrange two Hall elements enough close to each otherly, then be assumed to be identical as the interference field on two Hall elements.Therefore draw for measured value:
MW1a＝+B+S
MW1b＝-B+S
Represent interference field at this with S.The subtracting each other so cause overall measurement value MW of two measured values:
MW＝MW1a-MW1b＝+B-(-B)+S-S+2B
Therefore eliminated interference field, the magnetic field value of doubled effective measured value, just measuring.
Can so arrange two Hall elements selectively, it measures the magnetic field of measuring fully with different symbols respectively, that is to say that effective field B has identical symbol for this reason, and interference field S has different symbols.Eliminate interference field by addition in this case:
MW1a＝B+S
MW1b＝B-S
MW＝MW1a+MW1b
As what illustrate previously, in this layout of Hall element, notice that probe has short as far as possible interval each other, therefore the locational interference field at Hall element 1 is identical as far as possible.This is important in addition, not because the electric current kelvin effect influences field intensity.It is useful that this Hall element is arranged on the round conductor.According to Fig. 2 for example conductor 2 near Hall element, implement as round conductor.
Therefore measure the magnetic field that produces by the electric current that in conductor 2, flows through in the same manner on two Hall element numerical value, to arrange two Hall elements with conductor 2 identical distance.
Can so arrange Hall element 1 in addition, conductor 2 is between two Hall elements 1, as what describe in Fig. 2.This layout be a kind of may, so arrange Hall element, on its numerical value in the same manner, detect magnetic field with contrary sign.Also can consider other layout naturally, such layout for example, two Hall elements 1 directly are arranged side by side in a side of conductor 2 in this arrangement.
According to Fig. 1 comprise Hall element 1 current metering sensor, such as according to Fig. 1 in overcurrent relay with conductor 2 and loop line 4, be installed in the predetermined conductor structure.Therefore can so arrange and calibrate Hall element 1a and 1b, consider the influence of loop line 4, reduce known at least disturbing effect according to conductor structure thus.Therefore current metering sensor according to first embodiment can be mainly used in the known also changeless conductor structure.
Describe current metering sensor according to second embodiment below, it can be applied in the non-known conductor structure.
This current metering sensor has been described in Fig. 3.Two Hall elements are surrounded in shielding 3 according to a tubulose of Fig. 3.By the outside disturbing effect of this measure shielding, it is possible therefore measuring accurately.
According to the embodiment that illustrates previously, use two Hall elements, that is to say that a Hall element is right.Also can use the Hall element of arbitrary number, as long as these Hall elements misconnection like this is promptly eliminated interference field and addition measured value signal.
By improving the number of Hall element, can enlarge the distance of the measured value MW of generation to interference field, because eliminate interference field each Hall element centering, and the signal that doubles to measure.That is to say and under the situation of n Hall element, measure 2n magnetic field doubly.
Below with reference to Fig. 4 the evaluation circuit of current metering sensor according to first and second embodiment with two Hall elements is described.
On the conductor L of tubulose, arrange two Hall elements 11 and 21 relative to one another.So reciprocally arrange these Hall elements, by subtracting each other the elimination interference field from the signal of two Hall elements output.
At first be delivered to temperature compensation sensor 12 from the signal of Hall element 11 outputs.Eliminate the influence of temperature by this temperature compensation sensor 12 to measuring.Amplify the signal that has compensated by amplifier 13, wherein amplifying signal is supplied to a deviation-compensation equipment 14, the deviation of compensating signal (Offset) in this equipment.
In an identical manner, the signal from Hall element 21 outputs is supplied to temperature compensation sensor 22, amplifier 23 and deviation-compensation equipment 24.By deviation- compensation equipment 14 and 23 mutual compensating signals, so can supply with a subtracter 5 to signal.
Subtracter 5 subtracts each other two measuring-signals each other and exports a consequent signal, as what illustrate previously, has eliminated interference field in this signal.Amplify from the signal of subtracter 5 outputs by an amplifier 6, and output to corresponding other processing unit.At this overcurrent release 8 and signal converter interface 7 have been described as an example.Overcurrent release can be the release that illustrates such as in first embodiment.Signal converter interface 7 is for example exported an electric current, and it is proportional to measuring-signal, and for example 4 and 20mA between change.Can connect other interface in addition, show with dotted line by reference symbol 9.
As what illustrate previously, the number of the Hall element of current metering sensor is not limited to two, and can be that the Hall element of arbitrary number is right.
Have four evaluation circuits below with reference to Fig. 5 explanation according to the current metering sensor of the Hall element of the 3rd embodiment.
The same reference number is with consistent such as the similar elements in Fig. 4 in explanation.That is to say have temperature compensation sensor 12 and 22, amplifier 13 with 23 with deviation compensation equipment 14 and 24 two branch roads of in the working part of this explanation, pointing out with consistent according to the layout of Fig. 4.The output signal of these two branch roads is subtracted each other each other by subtracter 51, eliminates interference field thus.Before signal is supplied to totalizer 15, amplify from the signal of subtracter 51 outputs by amplifier 61.
Be additional to this and be arranged in and arranged two other Hall elements 31 and 41 on this conductor, its for example with the layout of Hall element 11 and 21 90 ° of ratio deviations mutually.As what illustrate previously, the signal of exporting from Hall element 31 is supplied to a temperature compensation sensor 32, amplifies the signal of temperature compensation by amplifier 33 similarly, and realizes skew or deviation compensations by deviation-compensation equipment 34.Be supplied to a temperature compensation sensor 42 from the signal of Hall element 41 outputs, amplify the signal of temperature compensation, and realize skew or deviation compensation by deviation-compensation equipment 44 by amplifier 43.The signal of deviation- compensation equipment 34 and 44 outputs subtracts each other each other by subtracter 52 then, wherein before this signal is supplied to totalizer 15, amplifies from the signal of subtracter 52 outputs by amplifier 62.
Totalizer 15 makes from two Hall elements 11 and 21 and 31 and 41 consequent measuring-signal addition.By amplifier 16 method composite signals, composite signal is supplied to other unit 7,8 and 9 as in according to the evaluation circuit of Fig. 4 then.
According to the 3rd embodiment, use two Hall elements right.Illustrated as the front, also can use the Hall element of higher number right.Such as set up an evaluation circuit thus arranged according to Fig. 5 the samely, wherein a plurality of then signals are supplied to totalizer 15 similarly.
Be that Hall element is selected a layout in according to the variation of the evaluation circuit of Figure 4 and 5, in this is arranged as in the description of first embodiment, mentioning, by the addition elimination interference field of output signal.That is to say in this case and must so arrange these Hall elements, promptly these Hall elements are with the magnetic field of identical respectively symbol detection by the conductor generation, with different symbol detection interference fields.In evaluation circuit, must replace subtracter 5 with a totalizer according to the 3rd embodiment.In variant, must replace subtracter 51 and 52 with totalizer respectively according to the 4th embodiment with the right evaluation circuit of two Hall elements.
The front has provided a current metering sensor, the principle that it is measured based on surface field.Current metering sensor has at least two the Hall element 1a and the 1b that are arranged on the conductor 2.So arrange these Hall elements, detect in the same manner on its numerical value on magnetic field that the electric current by the conductor of flowing through produces and the numerical value and detect interference field in the same manner, and with different respectively symbol detection or magnetic field or interference field.Corresponding therewith, perhaps by addition or by subtraction amplified current measured value, eliminated because the external disturbance influence of interference field.
Claims (11)
1. current metering sensor has
At least two Hall elements (1a, 1b) that are arranged on the conductor (2),
Wherein so arrange Hall element (1a, 1b), promptly detect in the same manner on its numerical value on magnetic field that the electric current by the conductor of flowing through (2) produces and the numerical value and detect interference field in the same manner, and with different respectively symbol detection or magnetic field or interference field.
2. according to the current metering sensor of claim 1, wherein
So arrange Hall element (1a, 1b), the magnetic field that produces with the electric current of different respectively symbol detection by the conductor of flowing through (2) by two Hall elements, and
The output signal of Hall element (1a, 1b) is subtracted each other each other.
3. according to the current metering sensor of claim 1, wherein
So arrange Hall element (1a, 1b), the magnetic field that produces with the electric current of identical symbol detection by the conductor of flowing through (2) by two Hall elements, and
The output signal addition of Hall element (1a, 1b).
4. according to the current metering sensor of one of aforesaid right requirement, wherein so arrange two Hall elements (1a, 1b), conductor (2) is between two Hall elements.
5. according to the current metering sensor of one of aforesaid right requirement, have a shielding (3), it is installed around Hall element (1a, 1b) and conductor (2).
6. according to the current metering sensor of one of aforesaid right requirement, wherein in conductor (2), relate to a round conductor.
7. according to the current metering sensor of one of aforesaid right requirement, wherein Hall element (1a, 1b) has as far as possible little spacing each other.
8. according to the current metering sensor of one of aforesaid right requirement, wherein Hall element (1a, 1b) has respectively to the identical spacing of conductor (2).
9. according to the current metering sensor of claim 2, wherein predesignate a plurality of Hall elements to (11 and 21,31 and 41), wherein subtract each other each other by subtracter (5,51,52), and the consequent signal of exporting is passed through totalizer (15) addition from Hall element in each centering output signal.
10. according to the current metering sensor of claim 3, wherein predesignate a plurality of Hall elements to (11 and 21,31 and 41), wherein pass through the totalizer addition, and the consequent signal of exporting is passed through totalizer (15) addition from Hall element in each centering output signal.
11. according to the current metering sensor of one of aforesaid right requirement, wherein the output signal of Hall element (11,21,31,41) is supplied to a temperature compensation sensor (12,22,32,42).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19914772A DE19914772A1 (en) | 1999-03-31 | 1999-03-31 | Current sensors |
| DE19914772.8 | 1999-03-31 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1353818A true CN1353818A (en) | 2002-06-12 |
| CN1180266C CN1180266C (en) | 2004-12-15 |
Family
ID=7903182
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB008083029A Expired - Lifetime CN1180266C (en) | 1999-03-31 | 2000-01-19 | Current metering sensor |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP1166131A1 (en) |
| JP (1) | JP2002541460A (en) |
| KR (1) | KR100681577B1 (en) |
| CN (1) | CN1180266C (en) |
| AU (1) | AU2438700A (en) |
| CA (1) | CA2368901A1 (en) |
| DE (1) | DE19914772A1 (en) |
| WO (1) | WO2000060366A1 (en) |
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| CN102012446A (en) * | 2009-09-04 | 2011-04-13 | 罗伯特·博世有限公司 | Current sensor, current measuring module and method for measuring current |
| WO2012075887A1 (en) * | 2010-12-09 | 2012-06-14 | 上海舜宇海逸光电技术有限公司 | Current measuring device and current measuring method |
| CN102841232A (en) * | 2011-05-09 | 2012-12-26 | 阿尔卑斯绿色器件株式会社 | Current sensor for electric wire |
| CN103065883A (en) * | 2013-01-09 | 2013-04-24 | 常州市吉士电器有限公司 | Intelligent high-voltage direct-current relay |
| CN103080753A (en) * | 2010-08-26 | 2013-05-01 | 株式会社自动网络技术研究所 | Current detection device and method for producing same |
| CN103645369A (en) * | 2013-11-15 | 2014-03-19 | 无锡乐尔科技有限公司 | Current sensing apparatus |
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| CN107677874A (en) * | 2017-02-24 | 2018-02-09 | 成都芯源系统有限公司 | Current sensing system and current sensing method |
| CN111308154A (en) * | 2018-12-12 | 2020-06-19 | 迈来芯电子科技有限公司 | Current sensor |
| CN113533825A (en) * | 2021-07-14 | 2021-10-22 | 郑州信工智能化系统有限公司 | Current measurement method capable of eliminating common-mode interference based on magnetoresistive sensor |
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| DE19914773B4 (en) * | 1999-03-31 | 2009-04-30 | Aeg Niederspannungstechnik Gmbh & Co Kg | Electric arc extinguishing aid |
| FR2827962B1 (en) * | 2001-07-25 | 2004-04-02 | Socomec Sa | HALL EFFECT MEASUREMENT DEVICE FOR THE INTENSITY OF AN ELECTRIC CURRENT |
| DE10158836B4 (en) * | 2001-11-30 | 2007-06-06 | Infineon Technologies Ag | Method and device for calibrating a sensor system |
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| DE10315532B4 (en) * | 2003-04-04 | 2014-08-14 | Infineon Technologies Ag | Integrated-type current sensor device and method of manufacturing |
| WO2005033717A1 (en) | 2003-10-01 | 2005-04-14 | Eaton Corporation | Magnetic flux concentrator current sensing topology |
| WO2007068221A1 (en) * | 2005-12-14 | 2007-06-21 | Siemens Aktiengesellschaft | Measuring device for forming a current measured value |
| DE112006004039A5 (en) * | 2006-07-26 | 2009-07-02 | Siemens Aktiengesellschaft | Current detection device |
| JP2008145352A (en) * | 2006-12-12 | 2008-06-26 | Jeco Co Ltd | Current sensor and current detecting method |
| KR20080095699A (en) | 2007-04-25 | 2008-10-29 | 삼성전기주식회사 | Apparatus of calculating fluid production utilizing electromagnetic induction theory and apparatus of generating fluid that can calculate fluid production |
| FR2919730A1 (en) * | 2007-08-02 | 2009-02-06 | Abb France | CURRENT SENSOR FOR MEASURING CURRENT CIRCULATING IN AT LEAST ONE DRIVER |
| EP2202527A1 (en) * | 2008-12-23 | 2010-06-30 | Abb Research Ltd. | Current measurement device and method |
| IT1396353B1 (en) * | 2009-10-28 | 2012-11-19 | Techimp Technologies S A Ora Techimp Technologies S R L | INSTRUMENT AND PROCEDURE FOR MEASURING THE LOSS FACTOR OF AN ELECTRIC EQUIPMENT. |
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| EP3958003A1 (en) * | 2020-08-18 | 2022-02-23 | Siemens Aktiengesellschaft | Current measuring device with hall sensors |
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- 1999-03-31 DE DE19914772A patent/DE19914772A1/en not_active Ceased
-
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- 2000-01-19 KR KR1020017012492A patent/KR100681577B1/en active IP Right Grant
- 2000-01-19 EP EP00902617A patent/EP1166131A1/en not_active Ceased
- 2000-01-19 CN CNB008083029A patent/CN1180266C/en not_active Expired - Lifetime
- 2000-01-19 WO PCT/EP2000/000395 patent/WO2000060366A1/en not_active Application Discontinuation
- 2000-01-19 CA CA002368901A patent/CA2368901A1/en not_active Abandoned
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| CN107179434A (en) * | 2017-05-23 | 2017-09-19 | 重庆大学 | A kind of current measuring method |
| CN111308154A (en) * | 2018-12-12 | 2020-06-19 | 迈来芯电子科技有限公司 | Current sensor |
| CN111308154B (en) * | 2018-12-12 | 2022-11-15 | 迈来芯电子科技有限公司 | Current sensor |
| CN113533825A (en) * | 2021-07-14 | 2021-10-22 | 郑州信工智能化系统有限公司 | Current measurement method capable of eliminating common-mode interference based on magnetoresistive sensor |
Also Published As
| Publication number | Publication date |
|---|---|
| DE19914772A1 (en) | 2000-10-12 |
| KR20010111285A (en) | 2001-12-17 |
| JP2002541460A (en) | 2002-12-03 |
| CA2368901A1 (en) | 2000-10-12 |
| WO2000060366A1 (en) | 2000-10-12 |
| CN1180266C (en) | 2004-12-15 |
| KR100681577B1 (en) | 2007-02-09 |
| EP1166131A1 (en) | 2002-01-02 |
| AU2438700A (en) | 2000-10-23 |
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