CN204989291U - Tunnel magneto resistor current sensor - Google Patents
Tunnel magneto resistor current sensor Download PDFInfo
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- CN204989291U CN204989291U CN201520650476.XU CN201520650476U CN204989291U CN 204989291 U CN204989291 U CN 204989291U CN 201520650476 U CN201520650476 U CN 201520650476U CN 204989291 U CN204989291 U CN 204989291U
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- magnetic field
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- ampereconductors
- tunnel magneto
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Abstract
The utility model provides a tunnel magneto resistor current sensor is surveyd the next size that detects the electric current of U -shaped electric current conductor of flowing through of magnetic field size that the electric current produced through responding to, including insulating housing, U -shaped electric current conductor, third electricity terminal, two magnetic field sensors, the special electronic circuit of ASIC, printed circuit board etc. U -shaped electric current conductor include first electric terminal and second electricity terminal, the magnetic field sensor adopts the TMR sensor, to being on a parallel with the magnetic field component on sensor surface is sensitive, and two magnetic field sensors arrange on the axis of the first electric terminal of U -shaped electric current conductor and second electricity terminal and arrange along a horizontal line, and a sensitive axle direction deviates from relatively or mutually, and this mode measuring current who has just constituted the difference can effectively restrain and come from outside disturbing magnetic field and because of the influence of changes in ambient temperature production.
Description
Technical field
The utility model relates to a kind of current sensor using magneto-resistor sensing element, is used for measuring the electric current flowing through conductor.
Background technology
In general, Magnetic Sensor, comprises Hall element, magnetoresistive element and the magnetic effect transistor etc. that make use of Hall effect.The size in magnetic field is converted to the electric signal corresponding with resistance variations or electromotive force etc. and exports by Magnetic Sensor, the magnetic field size produced by responding to determined electric current detects the size of the electric current flowing through conductor, if the disturbing magnetic field existed from outside likely causes current measurement precise decreasing.
In traditional measuring method, magnetic core is all adopted to measure near the mode of Hall effect element, but, the current sensor of this structure just must have the magnetic core of the surrounding being centered around conductor, therefore, be not suitable for miniaturization, and current sensor does not allow to manufacture magnetic core and Magnetic Sensor respectively, assemble again, the impact that the high and measuring accuracy of production cost is subject to variation of ambient temperature and assembling property will be result in larger.
In order to pursue the miniaturization of current sensor, in prior art, there is the current detecting chip without the need to magnetic core.But in this series products, needing to take into full account with electronic equipment is the safety standard of object, and fully takes into account the product development of space length and creepage distance.The bee-line in the space space length mentioned here refers to through two current-carrying parts, and creepage distance refers to the bee-line on the surface along the insulant between two current-carrying parts (primary current line and secondary circuit).And for this type of current detecting chip, owing to primary current line to be placed in chip internal, cause insulation distance inadequate, and can occur because of electric current larger time the heating that produces, cause output accuracy drift about, chip overheating damage even occur.
Utility model content
In order to overcome the above-mentioned problems in the prior art, the purpose of this utility model is, a kind of novel raising anti-interference be provided and number of components can be reduced to realize miniaturization, can install and ensure that the tunnel magneto resistance current sensor of enough electric isolution intensity by PCB.This tunnel magneto resistance current sensor adopts the tested current line in former limit and test circuit mode arranged apart; guarantee can not damage secondary circuit by the heating of primary current line during larger current; and the temperature characterisitic utilizing tunnel magneto resistance more stable, guarantee output accuracy during variation of ambient temperature.
In order to achieve the above object, the utility model proposes a kind of tunnel magneto resistance current sensor, the magnetic field size produced by responding to determined electric current detects the size of the electric current flowing through U-shaped Ampereconductors, and described tunnel magneto resistance current sensor comprises:
Insulation shell, be assemblied in the U-shaped Ampereconductors on insulation shell, 3rd electric terminal, two magnetic field sensors, ASIC special electronic circuit and PCB printed circuit board (PCB), wherein said U-shaped Ampereconductors has integrated first electric terminal and the second electric terminal, and electric current passes through the first described electric terminal to the second electric terminal, or electric current passes through the second electric terminal to the second electric terminal; The first described electric terminal and the second described electric terminal are arranged side by side; The 3rd described electric terminal comprises three connection terminals set side by side;
Described ASIC special electronic circuit and described two magnetic field sensors are arranged on the below of described U-shaped Ampereconductors; Described ASIC special electronic circuit and described magnetic field sensor are arranged on homonymy or the both sides of PCB printed circuit board (PCB); The 3rd described electric terminal is electrically connected with described ASIC special electronic circuit.
Preferably, two described magnetic field sensors to be arranged on the first electric terminal of U-shaped Ampereconductors and the axis of the second electric terminal and to arrange along a horizontal line, and sensitive axes direction relatively or contrarily from, flow through described U-shaped Ampereconductors electric current produce magnetic field refer in the opposite direction in the position of described two magnetic field sensors.
Preferably, described magnetic field sensor is TMR sensor.
Preferably, described magnetic field sensor is AMR sensor or GMR sensor.
Preferably, described magnetic field sensor includes 1,2 or 4 magnetoresistive element, forms wheatstone bridge circuits.
Preferably, described wheatstone bridge circuits is half-bridge, full-bridge or accurate bridge.
Preferably, described ASIC special electronic circuit, at least comprises resistance, electric capacity, signal processing circuit, signal amplification circuit and filtering circuit.
Preferably, described ASIC special electronic circuit and described two magnetic field sensors on the same chip integrated.
Preferably, the first electric terminal of described U-shaped Ampereconductors and the spacing of the second electric terminal inner side edge are 0.5mm or 1mm or 2mm.
Preferably, described insulation shell is plastic casing, and it is provided with cylindrical nose pile with to described U-shaped Ampereconductors location, and the diameter inside the diameter of described cylindrical nose pile and described U-shaped Ampereconductors matches.
Magnetic field sensor of the present utility model is responsive to the magnetic-field component being parallel to described sensor surface, two magnetic field sensors to be arranged on the first electric terminal of U-shaped Ampereconductors and the axis of the second electric terminal and to arrange along a horizontal line, and sensitive axes direction relatively or contrarily from, this detects electric current with regard to the mode constituting difference, can effectively suppress from the disturbing magnetic field of outside and the impact because of variation of ambient temperature generation.
In addition, compared with traditional Hall element, in temperature stability, magnetic field sensor of the present utility model has absolute advantage, is more suitable for applying under the environment that temperature variation is larger.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the utility model embodiment technology, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the perspective view of the utility model magnetic resistance sensor;
Fig. 2 is the U-shaped Ampereconductors close-up schematic view of the utility model magnetic resistance sensor;
Fig. 3 is the schematic cross-section of the utility model magnetic resistance sensor;
Fig. 4 is the schematic top plan view of the utility model magnetic resistance sensor;
Fig. 5 is the schematic top plan view comprising magnetic field sensor of the utility model magnetic resistance sensor;
Fig. 6 is embodiment one schematic diagram of the utility model magnetic resistance sensor;
Fig. 7 is embodiment two schematic diagram of the utility model magnetic resistance sensor.
Embodiment
Respectively preferred embodiment of the present utility model is described in detail below in conjunction with accompanying drawing; can be easier to be those skilled in the art will recognize that to make advantage of the present utility model and feature thus more explicit defining is made to protection domain of the present utility model.
Refer to accompanying drawing 1, accompanying drawing 1 is the perspective view of magnetic resistance sensor of the present utility model, includes U-shaped Ampereconductors 1,3rd electric terminal 2, plastic casings 3 etc., as can be seen from accompanying drawing 1, one-piece construction is rectangular shape, and two electric terminals of U-shaped Ampereconductors 1 be arranged in parallel.3rd electric terminal includes three connection terminals set side by side.Above-mentioned plastic casing 3 also can be other insulation shell.
Fig. 2 is the close-up schematic view of the U-shaped Ampereconductors of tunnel magneto resistance current sensor of the present utility model, there is integrated first electric terminal 7 and the second electric terminal 8, electric current is by the first described electric terminal 7 to the second electric terminal 8, or electric current is by the second electric terminal 8 to the first electric terminal 7; The first described electric terminal 7 and the second described electric terminal 8 are arranged side by side.The spacing of the first described electric terminal and the second electric terminal inner side edge is 0.5mm or 1mm or 2mm.
Fig. 3 is the schematic cross-section of the utility model magneto-resistor current sensor, and as can be seen from Figure 3, two magnetic field sensors 4 are arranged on the top of PCB printed circuit board (PCB) 6, and ASIC special electronic circuit 5 is arranged on the below of PCB printed circuit board (PCB) 6.ASIC special electronic circuit 5, at least comprises resistance, electric capacity, signal processing circuit, signal amplification circuit and filtering circuit.
By the cylindrical nose pile of plastic casing, U-shaped Ampereconductors is located, diameter inside the diameter of nose pile and U-shaped Ampereconductors matches, make U-shaped Ampereconductors easily and accurately can be arranged on the upper surface of plastic casing, significantly improve installation accuracy.
By two fixed parts about plastic casing, be in above plastic casing in assembling and insert U-shaped Ampereconductors, plastic casing is made of one piece with elastic deformation material, as long as the size of U-shaped Ampereconductors all can be assembled in tolerance.
There is multiple register pin plastic casing inside, and PCB is furnished with pilot hole at correspondence position, guarantees the assembly precision of PCB.
Fig. 4 and Fig. 5 is the vertical view of magnetic resistance sensor of the present utility model, two described magnetic field sensors to be arranged on the first electric terminal of U-shaped Ampereconductors and the axis of the second electric terminal and to arrange along a horizontal line, and sensitive axes direction relatively or contrarily from, flow through described U-shaped Ampereconductors electric current produce magnetic field refer in the opposite direction in the position of described two magnetic field sensors.
Wherein, magnetic field sensor is TMR sensor, also can substitute with AMR sensor or GMR sensor.Magnetic field sensor includes 1,2 or 4 two magnetoresistive element, forms bridge diagram.Described bridge diagram is half-bridge, full-bridge or accurate bridge.
Fig. 6 is the schematic diagram of a kind of embodiment of the present utility model, includes U-shaped Ampereconductors the 1, three electric terminal 2, plastic casing 3, two magnetic field sensor 4, ASIC special electronic circuit 5, PCB printed circuit board (PCB)s 6.Two magnetic field sensors 4 and ASIC special electronic circuit are arranged on below U-shaped Ampereconductors 1, and two magnetic field sensors 4 are arranged on the top of PCB printed circuit board (PCB) and are symmetrical arranged, and ASIC special electronic circuit 5 is arranged on the below of PCB printed circuit board (PCB) 6.Two magnetic field sensors 4 to be arranged on the first electric terminal 7 of U-shaped Ampereconductors 1 and the axis of the second electric terminal 8 and to arrange along a horizontal line, and sensitive axes direction relatively or contrarily from, this detects electric current with regard to the mode constituting difference, can effectively suppress from the disturbing magnetic field of outside and the impact because of variation of ambient temperature generation.
Fig. 7 is the schematic diagram of another kind of embodiment of the present utility model, includes U-shaped Ampereconductors the 1, three electric terminal 2 equally, plastic casing 3, two magnetic field sensor 4, ASIC special electronic circuit 5, PCB printed circuit board (PCB)s 6.Two magnetic field sensors 4 and ASIC special electronic circuit are arranged on below U-shaped Ampereconductors 1, and two magnetic field sensors 4 are arranged on the top of PCB printed circuit board (PCB) and are symmetrical arranged, and ASIC special electronic circuit 5 is arranged on the top of PCB printed circuit board (PCB) 6 equally.The mode that said structure constitutes difference equally detects electric current, in addition, in order to realize miniaturization, is integrated in same chip by magnetic field sensor and ASIC special electronic circuit, like this can easy to use and installation.
Above specific embodiment of the present utility model is illustrated in conjunction with diagram, clearly, on the basis not leaving scope and spirit of the present utility model, much can revises prior art and method.In art of the present utility model, the usual knowledge of a GPRS, just within the scope of technology main idea of the present utility model, can carry out diversified change.
Claims (10)
1. a tunnel magneto resistance current sensor, the magnetic field size produced by responding to determined electric current detects the size of the electric current flowing through U-shaped Ampereconductors, it is characterized in that: described tunnel magneto resistance current sensor comprises
Insulation shell, be assemblied in the U-shaped Ampereconductors on insulation shell, 3rd electric terminal, two magnetic field sensors, ASIC special electronic circuit and PCB printed circuit board (PCB), wherein said U-shaped Ampereconductors has integrated first electric terminal and the second electric terminal, and electric current passes through the first described electric terminal to the second electric terminal, or electric current passes through the second electric terminal to the second electric terminal; The first described electric terminal and the second described electric terminal are arranged side by side; The 3rd described electric terminal comprises three connection terminals set side by side;
Described ASIC special electronic circuit and described two magnetic field sensors are arranged on the below of described U-shaped Ampereconductors; Described ASIC special electronic circuit and described magnetic field sensor are arranged on homonymy or the both sides of PCB printed circuit board (PCB); The 3rd described electric terminal is electrically connected with described ASIC special electronic circuit.
2. tunnel magneto resistance current sensor according to claim 1, two described magnetic field sensors to be arranged on the first electric terminal of U-shaped Ampereconductors and the axis of the second electric terminal and to arrange along a horizontal line, and sensitive axes direction relatively or contrarily from, flow through described U-shaped Ampereconductors electric current produce magnetic field refer in the opposite direction in the position of described two magnetic field sensors.
3. tunnel magneto resistance current sensor according to claim 1, described magnetic field sensor is TMR sensor.
4. tunnel magneto resistance current sensor according to claim 1, described magnetic field sensor is AMR sensor or GMR sensor.
5. tunnel magneto resistance current sensor according to claim 3, described magnetic field sensor includes 1,2 or 4 magnetoresistive element, forms wheatstone bridge circuits.
6. tunnel magneto resistance current sensor according to claim 5, described wheatstone bridge circuits is half-bridge, full-bridge or accurate bridge.
7. tunnel magneto resistance current sensor according to claim 1, described ASIC special electronic circuit, at least comprises resistance, electric capacity, signal processing circuit, signal amplification circuit and filtering circuit.
8. tunnel magneto resistance current sensor according to claim 1, described ASIC special electronic circuit and described two magnetic field sensors on the same chip integrated.
9. tunnel magneto resistance current sensor according to claim 1 and 2, the first electric terminal of described U-shaped Ampereconductors and the spacing of the second electric terminal inner side edge are 0.5mm or 1mm or 2mm.
10. tunnel magneto resistance current sensor according to claim 1, described insulation shell is plastic casing, it is provided with cylindrical nose pile with to described U-shaped Ampereconductors location, and the diameter inside the diameter of described cylindrical nose pile and described U-shaped Ampereconductors matches.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520650476.XU CN204989291U (en) | 2015-08-26 | 2015-08-26 | Tunnel magneto resistor current sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520650476.XU CN204989291U (en) | 2015-08-26 | 2015-08-26 | Tunnel magneto resistor current sensor |
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| Publication Number | Publication Date |
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| CN204989291U true CN204989291U (en) | 2016-01-20 |
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| CN201520650476.XU Active CN204989291U (en) | 2015-08-26 | 2015-08-26 | Tunnel magneto resistor current sensor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105044439A (en) * | 2015-08-26 | 2015-11-11 | 江苏多维科技有限公司 | Tunnel magnetoresistance current sensor |
| CN109655652A (en) * | 2019-02-19 | 2019-04-19 | 国网天津市电力公司电力科学研究院 | A kind of novel TMR current sensor based on longitudinal choke |
| CN109752586A (en) * | 2019-03-13 | 2019-05-14 | 无锡乐尔科技有限公司 | Current detection means based on PCB |
-
2015
- 2015-08-26 CN CN201520650476.XU patent/CN204989291U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105044439A (en) * | 2015-08-26 | 2015-11-11 | 江苏多维科技有限公司 | Tunnel magnetoresistance current sensor |
| CN105044439B (en) * | 2015-08-26 | 2019-02-01 | 江苏多维科技有限公司 | A kind of tunnel magneto resistance current sensor |
| CN109655652A (en) * | 2019-02-19 | 2019-04-19 | 国网天津市电力公司电力科学研究院 | A kind of novel TMR current sensor based on longitudinal choke |
| CN109752586A (en) * | 2019-03-13 | 2019-05-14 | 无锡乐尔科技有限公司 | Current detection means based on PCB |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |