CN204666757U - Leakage current sensor - Google Patents
Leakage current sensor Download PDFInfo
- Publication number
- CN204666757U CN204666757U CN201520293228.4U CN201520293228U CN204666757U CN 204666757 U CN204666757 U CN 204666757U CN 201520293228 U CN201520293228 U CN 201520293228U CN 204666757 U CN204666757 U CN 204666757U
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- China
- Prior art keywords
- magnetism gathering
- gathering rings
- magnetic sensor
- leakage current
- circuit unit
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Abstract
The utility model discloses leakage current sensor, comprise magnetic sensor chips, magnetism gathering rings and shading ring; Described magnetism gathering rings is the ring texture with air gap that metal material is formed, and the inside of magnetism gathering rings is installed with the contrary current lead of current direction; Described magnetic sensor chips is positioned at the air gap of described magnetism gathering rings, and the field strength that the air gap place being used for measuring magnetism gathering rings converges also outputs signal; Described shading ring is arranged between magnetism gathering rings and current lead.The utility model also comprises amplifier circuit unit and filtering circuit unit, and the output signal of magnetic sensor chips is amplified through amplifier circuit unit successively, filtering circuit unit filtering.Also comprise the screening can of coated magnetic sensor chip, magnetism gathering rings, shading ring.Leakage current sensor of the present utility model accurately can measure the leakage current of the Alternating Current Power Supply comprising DC component, and this sensor overcomes the misjudgment phenomenon adopting GAP TYPE magnetism gathering rings to bring simultaneously, and can work under the environment with vibrations interference.
Description
Technical field
The utility model relates to current sensor field, particularly leakage current sensor.
Background technology
What the leakage current measurement of current main flow adopted is mutual inductor, mutual inductor is made up of closed magnetic core and coil, the working method adopting mutual inductor to detect the earth leakage breaking protector of leakage current is: two wires of the same circuit are inner through magnetic core, because the size of current on every root wire is equal, direction is contrary, so, its total current phasor and be zero, when there is electric leakage, due to loop You Liao branch, therefore pass the current phasor of transformer core and no longer equal zero, transformer secondary has induced potential to produce, thus pushing executing mechanism tripping major loop, play a protective role.The mutual inductor of closed magnetic core is adopted to have a defect when measuring leakage current, that be exactly under DC component effect magnetic permeability to decline rapidly and saturated, sampled value reduces rapidly thereupon, thus there is erroneous judgement, misjudgement phenomenon, and then great hidden danger is brought to the Electrical Safety in household, industry and the field such as medical.
The patent of China publication number CN102004203A: a kind of leak current detection device discloses the magnetism gathering rings of a kind of employing with air gap and the sensor of reluctive transducer measurement leakage current, this sensor measurement leakage current is adopted to efficiently solve the problems referred to above, but new problem is following, through the current phasor and often and non-vanishing of magnetic core inside, especially in the power utilization environment with certain vibrations, even if make loop not leak electricity, the resultant vector of two current in wire is non-vanishing, closed magnetic core is adopted due to it when adopting mutual inductor to measure leakage current, therefore the interference phenomenon that stream resultant vector is non-vanishing can be offset, but with reluctive transducer employing is the magnetism gathering rings being with air gap, erroneous judgement probability is increased.
Be not difficult to find out; the mode of the measurement leakage current of existing mutual-inductor type residual current circuit breaker cannot complete carries out accurately effective measurement and protection to the electric leakage situation of the AC load containing DC component; and reluctance type leakage current sensor is owing to adopting the magnetism gathering rings with air gap, therefore there is misjudgment phenomenon.
Summary of the invention
Technical problem to be solved in the utility model overcomes the deficiencies in the prior art and provides leakage current sensor, this leakage current sensor accurately can measure the leakage current of the Alternating Current Power Supply comprising DC component, this sensor overcomes the misjudgment phenomenon adopting GAP TYPE magnetism gathering rings to bring simultaneously, and can work under the environment with vibrations interference.
The utility model is for solving the problems of the technologies described above by the following technical solutions:
According to the leakage current sensor that the utility model proposes, comprise magnetic sensor chips, magnetism gathering rings and shading ring; Described magnetism gathering rings is the ring texture with air gap that metal material is formed, and the inside of magnetism gathering rings is installed with the contrary current lead of current direction; Described magnetic sensor chips is positioned at the air gap of described magnetism gathering rings, and the field strength that the air gap place being used for measuring magnetism gathering rings converges also outputs signal; Described shading ring is arranged between magnetism gathering rings and current lead.
As the further prioritization scheme of leakage current sensor described in the utility model, described shading ring is metal material.
As the further prioritization scheme of leakage current sensor described in the utility model, also comprise amplifier circuit unit and filtering circuit unit, the output signal of magnetic sensor chips is successively through amplifier circuit unit amplification, filtering circuit unit filtering.
As the further prioritization scheme of leakage current sensor described in the utility model, described magnetic sensor chips is made up of magnetic sensor elements, and described magnetic sensor elements is giant magnetoresistance element and/or magnetic tunnel junction element.
As the further prioritization scheme of leakage current sensor described in the utility model, described magnetism gathering rings is wound with anti-magnetized coil.
As the further prioritization scheme of leakage current sensor described in the utility model, also comprise the screening can of coated magnetic sensor chip, magnetism gathering rings, shading ring, described screening can is metal material.
As the further prioritization scheme of leakage current sensor described in the utility model, described magnetic sensor chips is single resistance, half-bridge or full bridge structure.
The utility model adopts above technical scheme compared with prior art, have following technique effect: leakage current sensor of the present utility model accurately can measure the leakage current of the Alternating Current Power Supply comprising DC component, this sensor can work under the environment of shaking interference simultaneously.
Accompanying drawing explanation
Fig. 1 is the structural representation of the leakage current sensor that the utility model proposes.
Fig. 2 is the curve of output schematic diagram of magnetic sensor chips.
Reference numeral in figure is interpreted as: 11-magnetic sensor chips, 12-magnetism gathering rings, 13-shading ring, the wire that 14-electric current enters, the wire that 15-electric current goes out, 17-screening can, 21-disturbed magnetic field, and 31-flows through the current value I of the wire that electric current enters
1, 32-flows through the current value I of the wire that electric current goes out
2.
Embodiment
Below in conjunction with accompanying drawing, the technical solution of the utility model is described in further detail:
Technical scheme in the application is understood better in order to make those skilled in the art person, below in conjunction with the accompanying drawing in the embodiment of the present application, technical scheme in the embodiment of the present application is clearly and completely described, obviously, described embodiment is only some embodiments of the present application, instead of whole embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all should belong to the scope of the application's protection.
As shown in Figure 1, the structural representation of the leakage current sensor that the utility model proposes, the leakage current sensor that the utility model proposes comprises magnetic sensor chips 11, magnetism gathering rings 12, shading ring 13 and circuit (not indicating in figure).Magnetism gathering rings 12 is the beckets with air gap, and the wire 15 that the wire 14 that electric current enters, electric current go out is all through the inside of magnetism gathering rings 12, and magnetism gathering rings is used for magnetic field to be collected to air gap place; Magnetic sensor chips 11 is positioned at the air gap place of magnetism gathering rings 12, and the field strength that the air gap place being used to measure magnetism gathering rings converges also outputs signal.If do not leak electricity generation, then flow through the current value I of the wire that electric current enters
131, the current value I of the wire that electric current goes out is flowed through
232 equal and directions are contrary, then the conjunction magnetic field produced near the wire 15 that the wire 14 entered at electric current, electric current go out can be approximately zero, and therefore magnetism gathering rings 12 can not produce Induced magnetic field, and the output of magnetic sensor chips 11 is zero.If there is leaky, then flow through the current value I of the wire that electric current enters
1with the current value I flowing through the wire that electric current goes out
2not etc., the conjunction magnetic field produced near the wire 15 that the wire 14 that electric current enters by magnetism gathering rings 12, electric current go out is collected to air gap place, and magnetic transducing chip 11 senses this magnetic field, and then produces output.
Owing to adopting the magnetism gathering rings structure of band air gap, under the effect of DC component, the magnetic permeability of magnetism gathering rings can not be decayed rapidly, its saturation field is much higher compared to closed magnet ring, but bring new problem to be thus, through the current phasor and often and non-vanishing of magnetic core inside, even if make loop not leak electricity, the resultant vector of two current in wire is also non-vanishing, closed magnetic core is adopted due to it when adopting mutual inductor to measure leakage current, therefore can the non-vanishing interference phenomenon of cancellation current resultant vector, if but employing is the magnetism gathering rings being with air gap, erroneous judgement probability then can be made to increase.
For the problems referred to above, the solution that the utility model proposes is that the position near the wire 15 that goes out of wire 14, the electric current entered at electric current arranges a shading ring 13.Shading ring 13 is a closed hoop structure, is arranged between magnetism gathering rings and current lead, adopts the metal material of high magnetic permeability to make.Due to magnetic shielding principle, because the disturbed magnetic field 21 that shake produces can be preferential through shading ring 13, therefore therefore electricity leakage sensor can not produce misjudgment phenomenon.If generation leaky, the conjunction magnetic field that wire 15 surrounding that wire 14, electric current that then electric current enters go out produces only is partially shielded near shading ring 13, due to shading ring 13 be have certain thickness, can not by all magnetic field shieldings, therefore major part still can be converged to air gap place by magnetism gathering rings 12, completes measurement by magnetic sensor chips 11.
What above-mentioned example adopted is two-phase alternating current, if what measure is three-phase alternating current, then what pass in magnetism gathering rings 12 and shading ring 13 is four wires in three-phase alternating current.
In order to reduce magnetic hysteresis, magnetism gathering rings 12 can be wound around the coil place in circuit of certain number of turn, the effect of circuit is for magnetic sensor chips 11 imports working current and signal output, circuit comprises amplifier circuit unit and filtering circuit unit, and the output signal of magnetic sensor chips is amplified through amplifier circuit unit successively, import system is available after filtering circuit unit filtering.Described amplifier circuit unit and filtering circuit unit are electrically connected with described magnetic sensor chips, in order to import working current and signal output.Circuit and magnetic sensor chips 11 can be arranged on a printed-wiring board (PWB), also can be on a single die integrated.
In order to avoid the electric current of outside and the interference in magnetic field, described stray field sensor also comprises a screening can 17, and this screening can 17 is metal material, by wherein coated to magnetic sensor chips 11, magnetism gathering rings 12, shading ring 13 and circuit.
Described magnetic sensor chips 11 is made up of magnetic sensor elements, and magnetic sensor elements can select saturation field comparatively large and the giant magnetoresistance element that precision is very high and/or magnetic tunnel junction element.Giant magnetoresistance element and magnetic tunnel junction element are the magnetoresistive elements that a kind of resistance changes with external magnetic field change, R-H(resistance-external magnetic field by existing technology magnetoresistive element) curve has low magnetic hysteresis, the characteristic of high saturation field and the wide range of linearity, relative to traditional magnetic sensor elements as telefault and Hall element have higher precision and better temperature characterisitic, have higher saturation field compared to anisotropic magnetoresistance element, its sensitive element as electricity leakage sensor is optimal.
Magnetic sensor chips 11 can be single resistance, half-bridge or full bridge structure.The brachium pontis of described single resistance, half-bridge or full-bridge is connected by one or more identical magnetic sensor elements and/or composes in parallel, and it can be equivalent to a magneto-resistor by each brachium pontis, and the magnetic-field-sensitive direction of the magnetic sensor elements in each brachium pontis is identical.Aforesaid single electric resistance structure contains a magneto-resistor, and half-bridge structure is composed in series by the magneto-resistor that two physical propertys are identical, and full bridge structure is connected and composed by the magneto-resistor that four physical propertys are identical, all will pass into constant voltage or electric current during use.Wherein, half-bridge or full bridge structure are optimum selection, and its curve of output is the curve of output schematic diagram of magnetic sensor chips as shown in Figure 2, wherein, and V
mAX+and V
mAX-for maximum output valve, H
sfor saturation field, its perform region is the range of linearity of curve of output.
The structural drawing of giant magnetoresistance element and magnetic tunnel element and principle of work, and the specific works mode of magnetic sensor chips can be the Chinese patent of CN103645369A with reference to publication number: a kind of current sensor device.
Should be appreciated that above is illustrative and not restrictive by preferred embodiment to the detailed description that the technical solution of the utility model is carried out.Those of ordinary skill in the art can modify to the technical scheme described in each embodiment on the basis of reading instructions of the present utility model, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of each embodiment technical scheme of the utility model.
Claims (7)
1. leakage current sensor, is characterized in that, comprises magnetic sensor chips, magnetism gathering rings and shading ring; Described magnetism gathering rings is the ring texture with air gap that metal material is formed, and the inside of magnetism gathering rings is installed with the contrary current lead of current direction; Described magnetic sensor chips is positioned at the air gap of described magnetism gathering rings, and the field strength that the air gap place being used for measuring magnetism gathering rings converges also outputs signal; Described shading ring is arranged between magnetism gathering rings and current lead.
2. leakage current sensor as claimed in claim 1, it is characterized in that, described shading ring is metal material.
3. leakage current sensor as claimed in claim 1, is characterized in that, also comprise amplifier circuit unit and filtering circuit unit, and the output signal of magnetic sensor chips is amplified through amplifier circuit unit successively, filtering circuit unit filtering.
4. leakage current sensor as claimed in claim 1, it is characterized in that, described magnetic sensor chips is made up of magnetic sensor elements, and described magnetic sensor elements is giant magnetoresistance element and/or magnetic tunnel junction element.
5. leakage current sensor as claimed in claim 1, is characterized in that, described magnetism gathering rings is wound with anti-magnetized coil.
6. as the leakage current sensor in claim 1-5 as described in any one, it is characterized in that, also comprise the screening can of coated magnetic sensor chip, magnetism gathering rings, shading ring, described screening can is metal material.
7. as the leakage current sensor in claim 1-5 as described in any one, it is characterized in that, described magnetic sensor chips is single resistance, half-bridge or full bridge structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520293228.4U CN204666757U (en) | 2015-05-08 | 2015-05-08 | Leakage current sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520293228.4U CN204666757U (en) | 2015-05-08 | 2015-05-08 | Leakage current sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204666757U true CN204666757U (en) | 2015-09-23 |
Family
ID=54137127
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520293228.4U Withdrawn - After Issue CN204666757U (en) | 2015-05-08 | 2015-05-08 | Leakage current sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204666757U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104849606A (en) * | 2015-05-08 | 2015-08-19 | 无锡乐尔科技有限公司 | Leakage current sensor |
| CN107677914A (en) * | 2017-07-19 | 2018-02-09 | 国网浙江省电力公司衢州供电公司 | A kind of Intelligent household leakage protector and guard method |
| CN114026439A (en) * | 2019-07-12 | 2022-02-08 | 莱姆国际股份有限公司 | Current transformer for measuring residual current |
-
2015
- 2015-05-08 CN CN201520293228.4U patent/CN204666757U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104849606A (en) * | 2015-05-08 | 2015-08-19 | 无锡乐尔科技有限公司 | Leakage current sensor |
| CN104849606B (en) * | 2015-05-08 | 2018-06-08 | 无锡乐尔科技有限公司 | Leakage current sensor |
| CN107677914A (en) * | 2017-07-19 | 2018-02-09 | 国网浙江省电力公司衢州供电公司 | A kind of Intelligent household leakage protector and guard method |
| CN114026439A (en) * | 2019-07-12 | 2022-02-08 | 莱姆国际股份有限公司 | Current transformer for measuring residual current |
| CN114026439B (en) * | 2019-07-12 | 2022-08-19 | 莱姆国际股份有限公司 | Current transformer for measuring residual current |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20150923 Effective date of abandoning: 20180608 |