CN104849606B - Leakage current sensor - Google Patents
Leakage current sensor Download PDFInfo
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- CN104849606B CN104849606B CN201510231076.XA CN201510231076A CN104849606B CN 104849606 B CN104849606 B CN 104849606B CN 201510231076 A CN201510231076 A CN 201510231076A CN 104849606 B CN104849606 B CN 104849606B
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- magnetism gathering
- gathering rings
- leakage current
- magnetic
- magnetic sensor
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Abstract
The invention discloses leakage current sensor, including magnetic sensor chips, magnetism gathering rings and shading ring；The magnetism gathering rings are the cyclic structure with air gap that metal material is formed, and the inside of magnetism gathering rings is installed with the opposite ampere wires of current direction；The magnetic sensor chips are located in the air gap of the magnetism gathering rings, for measuring the field strength converged at the air gap of magnetism gathering rings and output signal；The shading ring is arranged between magnetism gathering rings and ampere wires.The invention also includes amplifier circuit unit and filter circuit unit, the output signals of magnetic sensor chips is amplified successively through amplifier circuit unit, filter circuit unit filtering.Further include the shielding shell of coated magnetic sensor chip, magnetism gathering rings, shading ring.The leakage current sensor of the present invention can accurately measure the leakage current of the Alternating Current Power Supply comprising DC component, while the sensor overcomes the misjudgment phenomenon brought using GAP TYPE magnetism gathering rings, and can work in the environment of being interfered with vibrations.
Description
Technical field
The present invention relates to current sensor fields, particularly leakage current sensor.
Background technology
The leakage current measurement of mainstream is made of using mutual inductor, mutual inductor closed magnetic core and coil at present, using mutual
The working method of earth leakage breaking protector of sensor detection leakage current is：Two conducting wires of the same circuit are passed through inside magnetic core, by
It is equal in the size of current in each wire, direction on the contrary, so, total current phasor and be zero, when leaking electricity, by
It in circuit You Liao branches, therefore passes through the current phasor of transformer core and is no longer equal to zero, transformer secondary has induced potential
It generates, so as to pushing executing mechanism tripping major loop, plays a protective role.Mutual inductor using closed magnetic core is measuring leakage current
When there are one defect, that is, magnetic conductivity can decline and saturation rapidly under DC component effect, and sampled value reduces rapidly therewith,
So as to judge by accident, phenomenon is misjudged, and then great hidden danger is brought to the Electrical Safety in the fields such as household, industry and medical treatment.
The patent of Chinese publication number CN102004203A：A kind of leak current detection device discloses a kind of using with air gap
Magnetism gathering rings and reluctive transducer measure leakage current sensor, efficiently solved using the sensor measurement leakage current
State problem, but it is new the problem of it is following, across the current phasor inside magnetic core and often and be not zero, especially with
In the power utilization environment centainly shaken so that even if circuit is not leaked electricity, the resultant vector of two current in wire is not zero, using mutual inductance
Since it uses closed magnetic core when device measures leakage current, the interference phenomenon that stream resultant vector is not zero can be offset, but is used
Reluctive transducer is using the magnetism gathering rings with air gap so that erroneous judgement probability increases.
It is not difficult to find out, the mode of the measurement leakage current of existing mutual-inductor type leakage circuit breakers can not be completed to containing direct current
The electric leakage situation of the AC load of component carries out accurate effective measurement and protection, and reluctance type leakage current sensor is due to using
Magnetism gathering rings with air gap, therefore with misjudgment phenomenon.
Invention content
The technical problems to be solved by the invention are overcome the deficiencies in the prior art and provide leakage current sensor, the electric leakage
Flow sensor can accurately measure the leakage current of the Alternating Current Power Supply comprising DC component, while the sensor is overcome using gas
The misjudgment phenomenon that gap type magnetism gathering rings are brought, and can work in the environment of being interfered with vibrations.
The present invention uses following technical scheme to solve above-mentioned technical problem：
According to leakage current sensor proposed by the present invention, including magnetic sensor chips, magnetism gathering rings and shading ring；It is described poly-
Magnet ring is the cyclic structure with air gap that metal material is formed, and the inside of magnetism gathering rings is installed with the opposite electric current of current direction and leads
Line；The magnetic sensor chips are located in the air gap of the magnetism gathering rings, for measuring the magnetic field converged at the air gap of magnetism gathering rings
Field strength and output signal；The shading ring is arranged between magnetism gathering rings and ampere wires.
Scheme is advanced optimized as leakage current sensor of the present invention, the shading ring is metal material.
Scheme is advanced optimized as leakage current sensor of the present invention, further includes amplifier circuit unit and filtered electrical
Road unit, the output signals of magnetic sensor chips is amplified successively through amplifier circuit unit, filter circuit unit filtering.
Scheme is advanced optimized as leakage current sensor of the present invention, the magnetic sensor chips are passed by magnetism
Sensing unit is formed, and the magnetic sensor elements are giant magnetoresistance element and/or magnetic tunnel junction element.
Scheme is advanced optimized as leakage current sensor of the present invention, degaussing coil is wound on the magnetism gathering rings
Circle.
Advanced optimize scheme as leakage current sensor of the present invention, further include coated magnetic sensor chip,
The shielding shell of magnetism gathering rings, shading ring, the shielding shell is metal material.
Scheme is advanced optimized as leakage current sensor of the present invention, the magnetic sensor chips are single electricity
Resistance, half-bridge or full bridge structure.
The present invention compared with prior art, has following technique effect using above technical scheme：The leakage current of the present invention
Sensor can accurately measure the leakage current of the Alternating Current Power Supply comprising DC component, while the sensor can be in shaking interference
In the environment of work.
Description of the drawings
Fig. 1 is the structure diagram of leakage current sensor proposed by the present invention.
Fig. 2 is the curve of output schematic diagram of magnetic sensor chips.
Reference numeral in figure is construed to：11- magnetic sensor chips, 12- magnetism gathering rings, 13- shading rings, 14- electric currents into
Conducting wire, the conducting wire that 15- electric currents go out, 17- shielding shell, 21- disturbed magnetic fields, 31- flow through electric current into conducting wire current value I1,
32- flows through the current value I for the conducting wire that electric current goes out2。
Specific embodiment
Technical scheme of the present invention is described in further detail below in conjunction with the accompanying drawings：
In order to make those skilled in the art better understand the technical solutions in the application, below in conjunction with the application reality
The attached drawing in example is applied, the technical solution in the embodiment of the present application is clearly and completely described, it is clear that described implementation
Example is merely a part but not all of the embodiments of the present application.Based on the embodiment in the application, this field is common
Technical staff's all other embodiments obtained without making creative work should all belong to the application protection
Range.
As shown in Figure 1, the structure diagram of leakage current sensor proposed by the present invention, leakage current sensing proposed by the present invention
Device includes magnetic sensor chips 11, magnetism gathering rings 12, shading ring 13 and circuit（It is not indicated in figure）.Magnetism gathering rings 12 are with gas
The becket of gap, electric current into conducting wire 14, the conducting wire 15 that goes out of electric current both pass through the inside of magnetism gathering rings 12, magnetism gathering rings are used for magnetic field
It is collected at air gap；Magnetic sensor chips 11 are located at the air gap of magnetism gathering rings 12, are converged at the air gap of magnetism gathering rings for measuring
Poly- field strength and output signal.If not leaking electricity generation, flow through electric current into conducting wire current value I131st, electric current is flowed through
The current value I of the conducting wire gone out232 equal and directions on the contrary, then electric current into conducting wire 14, produce near the conducting wire 15 that goes out of electric current
Raw conjunction magnetic field can be approximately zero, therefore magnetism gathering rings 12 will not generate Induced magnetic field, and the output of magnetic sensor chips 11 is zero.
If there is leaky, flow through electric current into conducting wire current value I1With the current value I for flowing through the conducting wire that electric current goes out2It differs, poly- magnetic
Ring 12 by electric current into conducting wire 14, the conjunction magnetic field that nearby generates of the conducting wire 15 that goes out of electric current be collected at air gap, magnetic transducing chip
11 sense the magnetic field, and then generate output.
Due to using the magnetism gathering rings structure with air gap, under the action of DC component, the magnetic conductivity of magnetism gathering rings will not be rapid
Attenuation, saturation field is much higher compared to magnet ring is closed, but thus brings the problem of new to be, across the electric current inside magnetic core
Vector sum often and is not zero so that even if circuit is not leaked electricity, the resultant vector of two current in wire is also not zero, using mutual inductance
Since it uses closed magnetic core when device measures leakage current, the interference phenomenon that can be not zero with cancellation current resultant vector, still
It if using the magnetism gathering rings with air gap, can increase erroneous judgement probability.
In view of the above-mentioned problems, solution proposed by the present invention be electric current into conducting wire 14, the conducting wire 15 that goes out of electric current it is attached
Near position sets a shading ring 13.Shading ring 13 is a closed hoop structure, is arranged between magnetism gathering rings and ampere wires, adopts
It is made of the metal material of high magnetic permeability.Due to magnetic screen principle, because the disturbed magnetic field 21 that shake generates can preferentially pass through screen
Ring 13 is covered, therefore therefore electricity leakage sensor will not generate misjudgment phenomenon.If occur leaky, electric current into conducting wire 14, electricity
The conjunction magnetic field that 15 surrounding of conducting wire of outflow generates only is partially shielded near shading ring 13, since shading ring 13 is that have one
Determine thickness, will not be by all magnetic field shieldings, therefore major part can be still converged to by magnetism gathering rings 12 at air gap, by magnetic transducing
Device chip 11 is completed to measure.
Examples detailed above is using two-phase alternating current, if what is measured is three-phase alternating current, magnetism gathering rings 12 and shading ring 13
Four conducting wires being inside passed through in three-phase alternating current.
In order to reduce magnetic hysteresis, magnetism gathering rings 12 can wind the coil access circuit of certain number of turn, and the effect of circuit is for magnetism
Sensor chip 11 imports operating current and signal output, and circuit includes amplifier circuit unit and filter circuit unit, magnetic
The output signal of sensor chip amplifies through amplifier circuit unit successively, after filter circuit unit filtering import system for making
With.The amplifier circuit unit and filter circuit unit are electrically connected with the magnetic sensor chips, to import operating current
It is exported with signal.Circuit and magnetic sensor chips 11 may be disposed in a printed wiring board, can also be integrated in a core
On piece.
In order to avoid the interference in external electric current and magnetic field, the leakage field field sensor further includes a shielding shell 17,
The shielding shell 17 is metal material, by magnetic sensor chips 11, magnetism gathering rings 12, shading ring 13 and circuit cladding wherein.
The magnetic sensor chips 11 are made of magnetic sensor elements, magnetic sensor elements can be selected saturation field it is larger and
Precision very high giant magnetoresistance element and/or magnetic tunnel junction element.Giant magnetoresistance element and magnetic tunnel junction element are a kind of
The magnetoresistive element that resistance value changes with external magnetic field and changed, passes through the R-H of existing technology magnetoresistive element（Resistance value-external magnetic field）
Curve has the characteristic of low magnetic hysteresis, high saturation field and the wide range of linearity, relative to traditional magnetic sensor elements such as inductance coil
There is higher precision and better temperature characterisitic with Hall element, have compared to anisotropic magnetoresistance element higher full
And field, the sensing element as electricity leakage sensor are optimal.
Magnetic sensor chips 11 can be single resistance, half-bridge or full bridge structure.The bridge of the list resistance, half-bridge or full-bridge
Arm is connected and/or is composed in parallel by one or more identical magnetic sensor elements, it can be equivalent to one by each bridge arm
Magneto-resistor, the magnetic-field-sensitive direction of the magnetic sensor elements in each bridge arm are identical.There are one aforementioned single electric resistance structure contains
Magneto-resistor, half-bridge structure are composed in series by two identical magneto-resistors of physical property, and full bridge structure is identical by four physical properties
Magneto-resistor connect and compose, when use, will be passed through constant voltage or electric current.Wherein, half-bridge or full bridge structure are optimal choosing
It selects, curve of output is the curve of output schematic diagram of magnetic sensor chips as shown in Figure 2, wherein, VMAX+And VMAX-It is maximum defeated
Go out value, HSFor saturation field, working region is the range of linearity of curve of output.
The structure chart and operation principle of giant magnetoresistance element and magnetic tunnel element and the tool of magnetic sensor chips
Body running mode can refer to the Chinese patent of Publication No. CN103645369A：A kind of current sensor device.
It should be appreciated that the detailed description carried out above by preferred embodiment to technical scheme of the present invention is schematical
And not restrictive.Those of ordinary skill in the art can be to each embodiment institute on the basis of the specification for reading the present invention
The technical solution of record modifies or carries out equivalent replacement to which part technical characteristic；And these modifications or replacement,
The spirit and scope for various embodiments of the present invention technical solution that it does not separate the essence of the corresponding technical solution.
Claims (7)
1. leakage current sensor, which is characterized in that including magnetic sensor chips, magnetism gathering rings and shading ring；The magnetism gathering rings are
The cyclic structure with air gap that metal material is formed, the inside of magnetism gathering rings is installed with the opposite ampere wires of current direction；It is described
Magnetic sensor chips are located in the air gap of the magnetism gathering rings, for measuring the field strength and defeated converged at the air gap of magnetism gathering rings
Go out signal；The shading ring is arranged between magnetism gathering rings and ampere wires.
2. leakage current sensor as described in claim 1, which is characterized in that the shading ring is metal material.
3. leakage current sensor as described in claim 1, which is characterized in that further include amplifier circuit unit and filter circuit list
Member, the output signals of magnetic sensor chips is amplified successively through amplifier circuit unit, filter circuit unit filtering.
4. leakage current sensor as described in claim 1, which is characterized in that the magnetic sensor chips are by magnetic transducing member
Part is formed, and the magnetic sensor elements are giant magnetoresistance element and/or magnetic tunnel junction element.
5. leakage current sensor as described in claim 1, which is characterized in that be wound with anti-magnetized coil on the magnetism gathering rings.
6. the leakage current sensor as described in any one in claim 1-5, which is characterized in that further include coated magnetic sensing
Device chip, magnetism gathering rings, shading ring shielding shell, it is described shielding shell be metal material.
7. the leakage current sensor as described in any one in claim 1-5, which is characterized in that the magnetic sensor chips
For single resistance, half-bridge or full bridge structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510231076.XA CN104849606B (en) | 2015-05-08 | 2015-05-08 | Leakage current sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510231076.XA CN104849606B (en) | 2015-05-08 | 2015-05-08 | Leakage current sensor |
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| CN104849606A CN104849606A (en) | 2015-08-19 |
| CN104849606B true CN104849606B (en) | 2018-06-08 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108918950B (en) * | 2018-07-07 | 2020-12-15 | 浙江巨磁智能技术有限公司 | Leakage current sensing chip based on MEMS (micro-electromechanical systems) process |
| CN109813949A (en) * | 2018-12-26 | 2019-05-28 | 国网电力科学研究院武汉南瑞有限责任公司 | A kind of cable slack layer current detection means |
| CN115831529B (en) * | 2022-11-17 | 2024-01-23 | 南方电网数字电网研究院有限公司 | Magnetic flux collecting ring and current sensor |
| CN116666036B (en) * | 2023-05-17 | 2024-02-13 | 珠海多创科技有限公司 | Demagnetizing module and current sensor |
| CN116754815A (en) * | 2023-06-02 | 2023-09-15 | 珠海多创科技有限公司 | current sensor |
| CN117289008B (en) * | 2023-11-27 | 2024-02-02 | 江苏科兴电器有限公司 | 150kV tunneling giant magneto-resistance direct current sensor |
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| CN1578912A (en) * | 2001-11-01 | 2005-02-09 | 旭化成电子材料元件株式会社 | Current sensor and current sensor manufacturing method |
| CN1731624A (en) * | 2005-08-17 | 2006-02-08 | 海信集团有限公司 | Radio-frequency cable with loop seclusion function |
| CN201430074Y (en) * | 2009-04-20 | 2010-03-24 | 德清盖格电子有限公司 | Three-phase integral direct-current-component resistant miniature current transformer with magnetic shielding |
| CN102004203A (en) * | 2009-08-31 | 2011-04-06 | 西门子公司 | Leakage current detection device |
| CN203455390U (en) * | 2013-09-23 | 2014-02-26 | 珠海众锐科技有限公司 | An openable DC leakage current sensor |
| CN204666757U (en) * | 2015-05-08 | 2015-09-23 | 无锡乐尔科技有限公司 | Leakage current sensor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2013124875A (en) * | 2011-12-13 | 2013-06-24 | Japan Aviation Electronics Industry Ltd | Current sensor |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1578912A (en) * | 2001-11-01 | 2005-02-09 | 旭化成电子材料元件株式会社 | Current sensor and current sensor manufacturing method |
| CN1731624A (en) * | 2005-08-17 | 2006-02-08 | 海信集团有限公司 | Radio-frequency cable with loop seclusion function |
| CN201430074Y (en) * | 2009-04-20 | 2010-03-24 | 德清盖格电子有限公司 | Three-phase integral direct-current-component resistant miniature current transformer with magnetic shielding |
| CN102004203A (en) * | 2009-08-31 | 2011-04-06 | 西门子公司 | Leakage current detection device |
| CN203455390U (en) * | 2013-09-23 | 2014-02-26 | 珠海众锐科技有限公司 | An openable DC leakage current sensor |
| CN204666757U (en) * | 2015-05-08 | 2015-09-23 | 无锡乐尔科技有限公司 | Leakage current sensor |
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