CN102692610A - Electrical energy meter, external magnetic field detection method thereof and circuit thereof - Google Patents
Electrical energy meter, external magnetic field detection method thereof and circuit thereof Download PDFInfo
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- CN102692610A CN102692610A CN2011100704398A CN201110070439A CN102692610A CN 102692610 A CN102692610 A CN 102692610A CN 2011100704398 A CN2011100704398 A CN 2011100704398A CN 201110070439 A CN201110070439 A CN 201110070439A CN 102692610 A CN102692610 A CN 102692610A
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Abstract
An electric energy meter, an external magnetic field detection method and a circuit thereof are disclosed. The detecting method comprises the following steps of: setting a Hall magnetic detecting unit and another magnetic detection element, enabling a detection output of the another magnetic detecting unit and a detection output of the Hall magnetic detecting unit to form logical AND, thus giving a detection signal of the existence of an external magnetic field only when the another magnetic detecting unit and the Hall magnetic detecting unit detect the existence of a magnetic field at the same time and the Hall magnetic detecting unit is in an effective state. The misjudgment of an electric larceny behavior caused by function failure of the Hall magnetic detecting unit can be eliminated, and the reliability of the electric energy meter is raised.
Description
Technical field
The present invention relates to power equipment, relate in particular to a kind of detection method and circuit of electric energy meter working environment.
Background technology
The power supply of electric energy meter and metering section contain magnetic material mostly; Than the influence that is easier to receive the external magnetic field; In case the external magnetic field reaches certain intensity; Will cause magnetic saturation, cause the power supply and/or the metering section cisco unity malfunction of ammeter, the people is that a kind of conventional means of stealing electric energy applies outside high-intensity magnetic field so that electric energy meter work is not normal to electric energy meter exactly.In order to tackle this people is the situation of stealing electric energy; Increasing Utilities Electric Co. begins the function that the requirement electric energy meter has magnetic field detection: in case electric energy meter detects the external magnetic field; Electric energy meter will be carried out operations such as logout and/or electric energy punishment according to preset program, is the evidence obtaining and the sanction of stealing incident with convenience to the people.Because Hall element not only can detect the external magnetic field reliably; The intensity of control detection external magnetic field with comparalive ease; Adopt high-intensity magnetic field in the time of can distinguishing natural external magnetic field and artificial stealing effectively, so the general intensity that adopts Hall element to detect the external magnetic field in the electric energy meter.
Usually, Hall element also has a detection signal output terminal except power supply is supplied with end.Under the situation that does not detect the external magnetic field, in other words, when external magnetic field strength was lower than the setting threshold of Hall element, Hall component output was output as high level through external pull-up resistor; Detecting under the situation of external magnetic field, in other words, external magnetic field strength reaches or when surpassing the setting threshold of Hall element, Hall component output provides low level.One input port of the microprocessor in this Hall component output and the electric energy meter is linked to each other, and electric energy meter has just had the measuring ability that just judges whether the existence of external magnetic field through the level of Hall element output.
Hall element itself is a kind of semiconductor devices, is receiving under strong static or other the strongly disturbing situation, damages easily.According to the checking of a large amount of experiments and electric energy meter erecting stage, the situation of output terminal and power supply ground short circuit can appear in Hall element after damage, thereby causes providing low level all the time at its output terminal.This situation can make microprocessor think by mistake and detect the external magnetic field, and carries out operations such as logout and/or electric energy punishment by error, causes the electric energy table function unreliable, between electric company and power consumer, causes unnecessary controversial issue.
Summary of the invention
The technical matters that the present invention will solve is to overcome the deficiency that above-mentioned prior art exists, and proposes a kind of external magnetic field detection method and circuit, the stealing situation erroneous judgement that causes to eliminate Hall element itself to lose efficacy effectively, thereby the reliability of raising electric energy meter.
The technical scheme that the present invention is directed to above-mentioned technical matters and propose comprises; A kind of external magnetic field detection method of electric energy meter is proposed; Comprise a Hall magnetic detecting unit and another magnetic detecting unit are set; And the detection output of the detection output that makes this another magnetic detecting unit and this Hall magnetic detecting unit constitutes logical and, thereby the existence and this Hall magnetic detecting unit that only detect magnetic field simultaneously at this another magnetic detecting unit and Hall magnetic detecting unit are in the detection signal that effective status just can provide the external magnetic field existence.
This Hall magnetic detecting unit is judged the setting threshold of the setting threshold of effective magnetic field intensity detection much larger than this another magnetic detecting unit judgement effective magnetic field intensity detection.
The output terminal of this Hall magnetic detecting unit provides the detection signal that is in significant level when this Hall magnetic detecting unit is in effective status and detect the existing of magnetic field, and the output terminal of this Hall magnetic detecting unit can provide the detection signal that is in significant level all the time when this Hall magnetic detecting unit is in failure state;
This another magnetic detecting unit comprises a magnetic switch, the output terminal that an end of this magnetic switch links to each other with the output terminal of this Hall magnetic detecting unit, the other end constitutes this testing circuit, this magnetic switch only when detecting the existing of magnetic field two ends be communicated with.
The technical scheme that the present invention is directed to above-mentioned technical matters and propose also comprises; A kind of external magnetic field testing circuit of electric energy meter is proposed; Comprise a Hall magnetic detecting unit and a magnetic switch unit; The output terminal that one end of this magnetic switch unit links to each other with the output terminal of this Hall magnetic detecting unit, the other end constitutes this testing circuit; This magnetic switch unit only when detecting the existing of magnetic field two ends be communicated with, just can provide the detection signal that is in significant level thereby existence and this Hall magnetic detecting unit that the output terminal of this testing circuit only detects magnetic field at this magnetic switch unit and Hall magnetic detecting unit simultaneously are in effective status.
This magnetic switch unit comprises a magnetic switch, and this magnetic switch is in closure state when only externally magnetic field intensity surpasses a setting threshold.
This Hall magnetic detecting unit comprises a Hall element; This Hall element provides the detection signal of significant level when externally magnetic field intensity surpasses a setting threshold; This Hall element can provide the detection signal of significant level all the time after inefficacy, the setting threshold of this Hall element is much larger than the setting threshold of this magnetic switch.
This magnetic switch is a tongue tube.
This testing circuit also comprises a bias unit; One end of this bias unit and the output terminal of this testing circuit; The other end and one is set level and is linked to each other, and when not detecting existing of magnetic field with the output terminal of guaranteeing this testing circuit in this magnetic switch unit is to provide the detection signal that is in inactive level.
This bias unit is a resistance.
Further; The technical scheme that the present invention is directed to above-mentioned technical matters and propose also comprises; Propose a kind of electric energy meter, it comprises a microprocessor and external magnetic field testing circuit as stated, and the output terminal of this testing circuit links to each other with an input port of this microprocessor.
Compared with prior art; Electric energy meter of the present invention and external magnetic field detection method and circuit; Be connected in series a magnetic switch unit through output terminal at Hall magnetic detecting unit; Can eliminate the erroneous judgement that the disabler of Hall magnetic detecting unit own caused is the situation of electricity filching behavior, improves the reliability of electric energy meter.
Description of drawings
Fig. 1 electric theory diagram that to be external magnetic field testing circuit embodiment of the present invention cooperate with microprocessor in the electric energy meter.
Embodiment
Below in conjunction with accompanying drawing, the present invention is given elaboration further.
The external magnetic field detection method of electric energy meter of the present invention; Comprise a Hall magnetic detecting unit is set; Also comprise a magnetic detecting unit is set; And the detection output of the detection output that makes this magnetic detecting unit and this Hall magnetic detecting unit constitutes logical and, thereby the existence and this Hall magnetic detecting unit that only detect magnetic field in this magnetic switch unit simultaneously with Hall magnetic detecting unit are in the detection signal that effective status just can provide the external magnetic field existence.
This Hall magnetic detecting unit is judged the setting threshold of the setting threshold of effective magnetic field intensity detection much larger than this magnetic detecting unit judgement effective magnetic field intensity detection.
The output terminal of this Hall magnetic detecting unit provides the detection signal that is in significant level when this Hall magnetic detecting unit is in effective status and detect the existing of magnetic field, and the output terminal of this Hall magnetic detecting unit can provide the detection signal that is in significant level all the time when this Hall magnetic detecting unit is in failure state;
The output terminal that one end of this magnetic switch unit links to each other with the output terminal of this Hall magnetic detecting unit, the other end constitutes this testing circuit; This magnetic switch unit only when detecting the existing of magnetic field two ends be communicated with, just can provide the detection signal that is in significant level thereby existence and this Hall magnetic detecting unit that the output terminal of this testing circuit only detects magnetic field at this magnetic switch unit and Hall magnetic detecting unit simultaneously are in effective status.
As shown in Figure 1, external magnetic field of the present invention testing circuit 1 comprises: each other a Hall magnetic detecting unit 11 and a magnetic switch unit 12 of serial connection, the input port of relative microprocessor 2, the two logically constitute and relation.
Hall magnetic detecting unit 11 can be made up of a Hall element and peripheral components thereof, and this Hall element comprises two power ports and an output port at least, and it is mainly used in and detects the external magnetic field.
Magnetic switch unit 12 can be made up of a tongue tube, and it is mainly used in and prevents that the erroneous judgement that caused after Hall element lost efficacy from breaking, misoperation.
There is not the situation of drawing on the inside in input port at this microprocessor 2; External magnetic field of the present invention testing circuit 1 also should comprise a bias unit 13; It is realized by a resistance, provides high level when not detecting existing of magnetic field with the output terminal of guaranteeing testing circuit 1 in magnetic switch unit 12.
Testing circuit 1 concrete principle of work in external magnetic field of the present invention is following:
Externally do not have under the situation in magnetic field, tongue tube is in off-state, and the input port of microprocessor 2 is maintained high level through drawing on the resistance, and electric energy meter thinks that be no magnetic field state this moment, and this is consistent with actual conditions;
After externally having added the magnetic field of certain intensity,, tongue tube (, and is difficult for regulating the setting threshold that magnetic field intensity detects just because of it is too responsive because being the very high magnetic switch of sensitivity; So can not only adopt tongue tube to carry out the external magnetic field detects); Tongue tube can be introduced into conducting, by the time magnetic field increases to higher threshold, Hall element also can detect the existence in magnetic field; Its output becomes significant level: low level; The input port of microprocessor 2 captures low level, and this electric energy meter just can correctly be judged this moment for magnetic field state is arranged, and this is consistent with actual conditions;
When the situation of Hall element damage having occurred; No matter have or not magnetic field, Hall element output all is low level, but because tongue tube is an off-state under the situation in no magnetic field; So the input port of microprocessor 2 can correctly be in high level, it is disconnected that erroneous judgement can't appear in electric energy meter.
Compared with prior art; The beneficial effect of electric energy meter of the present invention and external magnetic field detection method and circuit comprises: can effectively prevent the erroneous judgement that caused after Hall element lost efficacy; Improve the reliability of external magnetic field measuring ability, and circuit is simple, with low cost.
Need to prove; Though all be that when detecting magnetic field, to export useful signal with Hall element be that low level is an example above; But the present invention is not as limit; Such as: for useful signal is the situation of high level, and the input port of microprocessor 2 do not move low low level situation to, can move ground to through this resistance.Though above-mentioned magnetic switch is selected tongue tube for use, the present invention is as limit, such as: can select for use its susceptibility to exceed another more Hall element of Hall element and do magnetic switch.
Foregoing; Be merely preferred embodiment of the present invention; Be not to be used to limit embodiment of the present invention; Those of ordinary skills can carry out corresponding flexible or modification, so protection scope of the present invention should be as the criterion with the desired protection domain of claims very easily according to main design of the present invention and spirit.
Claims (10)
1. the external magnetic field detection method of an electric energy meter; Comprise a Hall magnetic detecting unit is set; It is characterized in that; Also comprise another magnetic detecting unit is set, and the detection output of the detection output that makes this another magnetic detecting unit and this Hall magnetic detecting unit constitutes logical and, thereby the existence and this Hall magnetic detecting unit that only detect magnetic field simultaneously at this another magnetic detecting unit and Hall magnetic detecting unit are in the detection signal that effective status just can provide the external magnetic field existence.
2. according to the described external magnetic field of claim 1 detection method, it is characterized in that this Hall magnetic detecting unit is judged the setting threshold of the setting threshold of effective magnetic field intensity detection much larger than this another magnetic detecting unit judgement effective magnetic field intensity detection.
3. according to the described external magnetic field of claim 1 detection method, it is characterized in that:
The output terminal of this Hall magnetic detecting unit provides the detection signal that is in significant level when this Hall magnetic detecting unit is in effective status and detect the existing of magnetic field, and the output terminal of this Hall magnetic detecting unit can provide the detection signal that is in significant level all the time when this Hall magnetic detecting unit is in failure state;
This another magnetic detecting unit comprises a magnetic switch, the output terminal that an end of this magnetic switch links to each other with the output terminal of this Hall magnetic detecting unit, the other end constitutes this testing circuit, this magnetic switch only when detecting the existing of magnetic field two ends be communicated with.
4. the external magnetic field testing circuit of an electric energy meter; Comprise a Hall magnetic detecting unit; It is characterized in that; This testing circuit also comprises a magnetic switch unit; The output terminal that one end of this magnetic switch unit links to each other with the output terminal of this Hall magnetic detecting unit, the other end constitutes this testing circuit, this magnetic switch unit only when detecting the existing of magnetic field two ends be communicated with, just can provide the detection signal that is in significant level thereby existence and this Hall magnetic detecting unit that the output terminal of this testing circuit only detects magnetic field at this magnetic switch unit and Hall magnetic detecting unit simultaneously are in effective status.
5. according to the described external magnetic field of claim 4 testing circuit, it is characterized in that this magnetic switch unit comprises a magnetic switch, this magnetic switch is in closure state when only externally magnetic field intensity surpasses a setting threshold.
6. according to the described external magnetic field of claim 5 testing circuit; It is characterized in that; This Hall magnetic detecting unit comprises a Hall element; This Hall element provides the detection signal of significant level when externally magnetic field intensity surpasses a setting threshold, this Hall element can provide the detection signal of significant level all the time after inefficacy, and the setting threshold of this Hall element is much larger than the setting threshold of this magnetic switch.
7. according to the described external magnetic field of claim 6 testing circuit, it is characterized in that this magnetic switch is a tongue tube.
8. according to the described external magnetic field of claim 4 testing circuit; It is characterized in that; This testing circuit also comprises a bias unit; One end of this bias unit and the output terminal of this testing circuit, the other end and are set level and are linked to each other, and when not detecting existing of magnetic field with the output terminal of guaranteeing this testing circuit in this magnetic switch unit are to provide the detection signal that is in inactive level.
9. according to the described external magnetic field of claim 8 testing circuit, it is characterized in that this bias unit is a resistance.
10. an electric energy meter comprises a microprocessor, it is characterized in that, comprises that also the output terminal of this testing circuit links to each other with an input port of this microprocessor like each described external magnetic field testing circuit in the claim 4 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2011100704398A CN102692610A (en) | 2011-03-23 | 2011-03-23 | Electrical energy meter, external magnetic field detection method thereof and circuit thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011100704398A CN102692610A (en) | 2011-03-23 | 2011-03-23 | Electrical energy meter, external magnetic field detection method thereof and circuit thereof |
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| CN102692610A true CN102692610A (en) | 2012-09-26 |
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| CN2011100704398A Pending CN102692610A (en) | 2011-03-23 | 2011-03-23 | Electrical energy meter, external magnetic field detection method thereof and circuit thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103245810A (en) * | 2013-05-27 | 2013-08-14 | 沈阳时尚实业有限公司 | Anti-magnetic device and anti-magnetic method of intelligent electric energy meter |
| CN103954815A (en) * | 2014-04-30 | 2014-07-30 | 国网上海市电力公司 | Electricity larceny prevention check main machine |
| CN103954816A (en) * | 2014-04-30 | 2014-07-30 | 国网上海市电力公司 | Inelegant remote anti-electricity-stealing inspection method |
| CN104237590A (en) * | 2014-09-26 | 2014-12-24 | 国家电网公司 | Active electricity larceny prevention device and method aiming at magnetic electricity larceny compensation metering |
| CN106324306A (en) * | 2013-09-25 | 2017-01-11 | 国网河南镇平县供电公司 | Electric meter box device |
| CN113274517A (en) * | 2021-05-19 | 2021-08-20 | 深圳瑞格泰科医疗科技有限公司 | Self-adaptive magnetic field intensity non-magnetic ultraviolet disinfection system |
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| US20050122217A1 (en) * | 2002-07-31 | 2005-06-09 | Seal Brian K. | Magnetic field sensing for tamper identification |
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| EP1654552B1 (en) * | 2003-08-15 | 2008-10-15 | Systematic Design Holding B.V. | Method and apparatus for measuring a magnetic field by using a hall-sensor |
| CN201707372U (en) * | 2009-12-15 | 2011-01-12 | 山东电力集团公司 | Electricity stealing investigation and punishment strong magnetic alarm device for electric energy meter |
| CN201740814U (en) * | 2010-07-08 | 2011-02-09 | 山东电力集团公司 | Magnetic detection alarm electric energy meter |
| CN202003019U (en) * | 2011-03-23 | 2011-10-05 | 深圳长城开发科技股份有限公司 | Electric-energy meter and external magnetic-field detecting circuit thereof |
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| US20050122217A1 (en) * | 2002-07-31 | 2005-06-09 | Seal Brian K. | Magnetic field sensing for tamper identification |
| EP1654552B1 (en) * | 2003-08-15 | 2008-10-15 | Systematic Design Holding B.V. | Method and apparatus for measuring a magnetic field by using a hall-sensor |
| CN201021714Y (en) * | 2006-12-30 | 2008-02-13 | 比亚迪股份有限公司 | A non contact gear shift location detection device |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103245810A (en) * | 2013-05-27 | 2013-08-14 | 沈阳时尚实业有限公司 | Anti-magnetic device and anti-magnetic method of intelligent electric energy meter |
| CN103245810B (en) * | 2013-05-27 | 2015-09-30 | 沈阳时尚实业有限公司 | A kind of magnetism preventing device of intelligent electric energy meter and anti-magnetism method thereof |
| CN106324306A (en) * | 2013-09-25 | 2017-01-11 | 国网河南镇平县供电公司 | Electric meter box device |
| CN103954815A (en) * | 2014-04-30 | 2014-07-30 | 国网上海市电力公司 | Electricity larceny prevention check main machine |
| CN103954816A (en) * | 2014-04-30 | 2014-07-30 | 国网上海市电力公司 | Inelegant remote anti-electricity-stealing inspection method |
| CN104237590A (en) * | 2014-09-26 | 2014-12-24 | 国家电网公司 | Active electricity larceny prevention device and method aiming at magnetic electricity larceny compensation metering |
| CN104237590B (en) * | 2014-09-26 | 2018-01-12 | 国家电网公司 | A kind of active anti-electricity-theft device and the method for strong magnetic stealing compensation measurement |
| CN113274517A (en) * | 2021-05-19 | 2021-08-20 | 深圳瑞格泰科医疗科技有限公司 | Self-adaptive magnetic field intensity non-magnetic ultraviolet disinfection system |
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Application publication date: 20120926 |