CN202003019U - Electric-energy meter and external magnetic-field detecting circuit thereof - Google Patents
Electric-energy meter and external magnetic-field detecting circuit thereof Download PDFInfo
- Publication number
- CN202003019U CN202003019U CN 201120078367 CN201120078367U CN202003019U CN 202003019 U CN202003019 U CN 202003019U CN 201120078367 CN201120078367 CN 201120078367 CN 201120078367 U CN201120078367 U CN 201120078367U CN 202003019 U CN202003019 U CN 202003019U
- Authority
- CN
- China
- Prior art keywords
- magnetic
- magnetic field
- testing circuit
- hall
- unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Abstract
The utility model relates to an electric-energy meter and an external magnetic-field detecting circuit thereof. The detecting circuit comprises a hall magnetic-detecting unit and a magnetic-switching unit, wherein one end of the magnetic-switching unit is connected with the output end of the hall magnetic-detecting unit, the output end of the detecting circuit is formed by the other end of the magnetic-switching unit, both ends of the magnetic-switching unit are communicated only when the existence of a magnetic field is detected, and therefore a detection signal in an effective level can be given by the output end of the detecting circuit only when the existence of the magnetic field is simultaneously detected by the magnetic-switching unit and the hall magnetic-detecting unit and the hall magnetic-detecting unit is in an effective state. The misjudged situation as an electricity-stealing behavior caused by the function failure of the hall magnetic-detecting unit per se can be eliminated, and the reliability of the electric-energy meter is improved.
Description
Technical field
The utility model relates to power equipment, relates in particular to a kind of testing 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 be subjected to 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 the power supply supply side.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 by 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 by the level of Hall element output.
Hall element itself is a kind of semiconductor devices, is being subjected under strong static or other the strongly disturbing situations, 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 mistakenly, causes the electric energy meter function unreliable, causes unnecessary controversial issue between electric company and power consumer.
The utility model content
The technical problems to be solved in the utility model is to overcome the deficiency that above-mentioned prior art exists, and proposes a kind of external magnetic field testing 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 utility model proposes at above-mentioned technical matters 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, 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 the output terminal of this testing circuit, this magnetic switch unit only when detecting the existing of magnetic field two ends be communicated with, be in effective status and just can provide the detection signal that is in significant level thereby the output terminal of this testing circuit only detects the existence in magnetic field and this Hall magnetic detecting unit simultaneously at this magnetic switch unit and Hall magnetic detecting unit.
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.
The technical scheme that the utility model proposes at above-mentioned technical matters comprises that also propose a kind of electric energy meter, it comprises a microprocessor and external magnetic field testing circuit as mentioned above, 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 utility model and external magnetic field testing circuit thereof, be connected in series a magnetic switch unit by 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 utility model cooperate with microprocessor in the electric energy meter.
Embodiment
Below in conjunction with accompanying drawing, the utility model is given elaboration further.
The external magnetic field detection method of electric energy meter of the present utility model, 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 output terminal links to each other, the other end constitutes this testing circuit of one end of this magnetic switch unit and this Hall magnetic detecting unit, this magnetic switch unit only when detecting the existing of magnetic field two ends be communicated with, be in effective status and just can provide the detection signal that is in significant level thereby the output terminal of this testing circuit only detects the existence in magnetic field and this Hall magnetic detecting unit simultaneously at this magnetic switch unit and Hall magnetic detecting unit.
As shown in Figure 1, external magnetic field of the present utility model testing circuit 1 comprises: mutually a Hall magnetic detecting unit 11 and a magnetic switch unit 12 of serial connection, the input port of microprocessor 2 relatively, the two logically constitute and relation.
Hall magnetic detecting unit 11 can be made 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.
There is not the situation of drawing on the inside in input port at this microprocessor 2, external magnetic field of the present utility model 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.
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 by 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, because tongue tube is that the very high magnetic switch of sensitivity is (just because of it is too responsive, and be difficult for regulating the setting threshold that magnetic field intensity detects, 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, 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 utility model and external magnetic field testing circuit thereof 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 be simple, and with low cost.
Need to prove, though all be that to export useful signal with Hall element when detecting magnetic field be that low level is an example above, but the utility model is not as limit, such as: for useful signal is the situation of high level, and the input port of microprocessor 2 is not moved low low level situation to, can move ground to by this resistance.Though above-mentioned magnetic switch is selected tongue tube for use, the utility model 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; it only is preferred embodiment of the present utility model; be not to be used to limit embodiment of the present utility model; those of ordinary skills are according to main design of the present utility model and spirit; protection domain of the present utility model can carry out corresponding flexible or modification very easily, so should be as the criterion with the desired protection domain of claims.
Claims (7)
1. 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, 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 the output terminal of this testing circuit, this magnetic switch unit only when detecting the existing of magnetic field two ends be communicated with, be in effective status and just can provide the detection signal that is in significant level thereby the output terminal of this testing circuit only detects the existence in magnetic field and this Hall magnetic detecting unit simultaneously at this magnetic switch unit and Hall magnetic detecting unit.
2. according to the described external magnetic field of claim 1 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.
3. according to the described external magnetic field of claim 2 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, the setting threshold of this Hall element is much larger than the setting threshold of this magnetic switch.
4. according to the described external magnetic field of claim 3 testing circuit, it is characterized in that this magnetic switch is a tongue tube.
5. according to the described external magnetic field of claim 1 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 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.
6. according to the described external magnetic field of claim 5 testing circuit, it is characterized in that this bias unit is a resistance.
7. 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 as each described external magnetic field testing circuit in the claim 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120078367 CN202003019U (en) | 2011-03-23 | 2011-03-23 | Electric-energy meter and external magnetic-field detecting circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120078367 CN202003019U (en) | 2011-03-23 | 2011-03-23 | Electric-energy meter and external magnetic-field detecting circuit thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202003019U true CN202003019U (en) | 2011-10-05 |
Family
ID=44705756
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201120078367 Expired - Lifetime CN202003019U (en) | 2011-03-23 | 2011-03-23 | Electric-energy meter and external magnetic-field detecting circuit thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202003019U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102692610A (en) * | 2011-03-23 | 2012-09-26 | 深圳长城开发科技股份有限公司 | Electrical energy meter, external magnetic field detection method thereof and circuit thereof |
| CN110048747A (en) * | 2019-05-31 | 2019-07-23 | 河南航飞光电科技有限公司 | Localizer beacon and its method for parameter configuration |
-
2011
- 2011-03-23 CN CN 201120078367 patent/CN202003019U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102692610A (en) * | 2011-03-23 | 2012-09-26 | 深圳长城开发科技股份有限公司 | Electrical energy meter, external magnetic field detection method thereof and circuit thereof |
| CN110048747A (en) * | 2019-05-31 | 2019-07-23 | 河南航飞光电科技有限公司 | Localizer beacon and its method for parameter configuration |
| CN110048747B (en) * | 2019-05-31 | 2023-06-30 | 河南航飞光电科技有限公司 | Positioning beacon and parameter configuration method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102692610A (en) | Electrical energy meter, external magnetic field detection method thereof and circuit thereof | |
| CN202994951U (en) | Diesel-engine fuel-cut-off solenoid valve coil break line detection apparatus | |
| CN201724975U (en) | Brown out detection circuit of electric meter system | |
| CN205539381U (en) | Under -voltage relay of preventing false retrieval floodgate detection circuitry that opens and shuts | |
| CN202003019U (en) | Electric-energy meter and external magnetic-field detecting circuit thereof | |
| CN103353569A (en) | Relay connection state detecting apparatus | |
| CN103308755B (en) | The insulation detection device of high voltage direct current remote electric power system and method | |
| CN2935175Y (en) | Fault indicator of power supply line | |
| CN106505518A (en) | A kind of earth leakage protective device | |
| CN202066615U (en) | Improved temperature measuring circuit | |
| CN101843442B (en) | Anti-dry heating soymilk machine and anhydrous anti-dry heating detecting method | |
| CN103852680A (en) | Device and method for detecting broken line of switching value signal transmission circuit | |
| CN102253334A (en) | Circuit for detecting open and close states of relay for electric energy meter | |
| CN205231816U (en) | Rifle control box charges | |
| CN202110215U (en) | Switching detection circuit of relay for electric energy meter | |
| CN201788261U (en) | Switching value detection circuit | |
| CN201359629Y (en) | Direct-current power supply grounding alarm device | |
| CN203396891U (en) | Transformer wire fracture detection device | |
| CN205333770U (en) | Line detection device and system | |
| CN206283051U (en) | Intelligent wireless earth leakage protective socket | |
| CN204945993U (en) | A kind of watchdog circuit being applicable to Safety output | |
| CN201479113U (en) | Trigger interface circuit irrespective of polarity | |
| CN2927442Y (en) | Locker against electric shock for household electrical appliance | |
| CN204346539U (en) | There is water level detection circuit and the cooking apparatus of self-checking function | |
| CN201623456U (en) | Residual current action relay |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20111005 |
|
| CX01 | Expiry of patent term |