阅读说明：本技术 自供电磁传感器芯片 (Self-powered magnetic sensor chip ) 是由 刘明 胡忠强 关蒙萌 周子尧 吴金根 于 2019-09-10 设计创作，主要内容包括：自供电磁传感器芯片,包括：磁场探测单元,所述磁场探测单元为磁阻传感器；能量收集单元,所述能量收集单元用于将外部磁场转换为电场,为所述磁场探测单元供电。本发明利用磁电技术,采用可以从外部磁场获取能量并转换为电场的材料制成能量收集单元,由能量收集单元为磁场探测单元供电,使得传感器芯片可以从环境中实现自取能,实现内部的能量闭环,无需额外的电池供电,降低了维护成本。(Self-powered magnetic sensor chip, comprising: detection of magnetic field unit, the detection of magnetic field unit are magnetoresistive sensor；Energy collection unit, the energy collection unit are used to external magnetic field being converted to electric field, power for the detection of magnetic field unit.The present invention utilizes magnetoelectricity technology, energy collection unit be made using that can obtain energy from external magnetic field and be converted to the material of electric field, it is the power supply of detection of magnetic field unit by energy collection unit, sensor chip is allowed to realize self-energizing from environment, energy closed loop inside realizing, it powers without additional battery, reduces maintenance cost.)

1. self-powered magnetic sensor chip characterized by comprising

Detection of magnetic field unit, the detection of magnetic field unit are magnetoresistive sensor；

Energy collection unit, the energy collection unit are used to external magnetic field being converted to electric field, are the detection of magnetic field unit Power supply.

2. self-powered magnetic sensor chip as described in claim 1, it is characterised in that: the magnetoresistive sensor is TMR sensing Device or AMR sensor or GMR sensor.

3. self-powered magnetic sensor chip as claimed in claim 1 or 2, it is characterised in that: the energy collection unit is by magnetic Composite is made.

4. self-powered magnetic sensor chip as claimed in claim 3, it is characterised in that: the magnetic electric compound material is by ferromagnetic More iron hetero-junctions of material and the compound composition of ferroelectric material, the energy collection unit includes ferromagnetic layer and ferroelectric layer.

5. self-powered magnetic sensor chip as claimed in claim 4, it is characterised in that: the ferromagnetic layer and the ferroelectric layer are logical The mode for crossing gluing or extension is compound.

6. self-powered magnetic sensor chip as described in claim 4 or 5, it is characterised in that: energy collection unit includes successively Ferromagnetic layer, ferroelectric layer and the ferromagnetic layer of setting.

7. self-powered magnetic sensor chip as described in claim 4 or 5, it is characterised in that: the ferromagnetic layer is by magnetostriction Coefficient >=50ppm material is made.

8. self-powered magnetic sensor chip as claimed in claim 7, it is characterised in that: the ferromagnetic layer is by FeGaB or CoFeB Or CoFe or its alloy are made.

9. self-powered magnetic sensor chip as described in claim 4 or 5, it is characterised in that: the ferroelectric layer is by piezoelectric modulus The material of > 500 is made.

10. self-powered magnetic sensor chip as claimed in claim 9, it is characterised in that: the ferroelectric layer is by AlN or PMN-PT Monocrystalline or PZN-PT monocrystalline or ceramics are made.

11. self-powered magnetic sensor chip as described in claim 1, it is characterised in that: further include rectification circuit and energy storage electricity Road, the output end of the energy collection unit are connected with the rectification circuit, the output end of the rectification circuit and the energy storage Circuit is connected, and the output end of the accumulator is connected with the detection of magnetic field unit.

12. self-powered magnetic sensor chip as claimed in claim 11, it is characterised in that: the accumulator is capacitor.

13. the self-powered magnetic sensor chip as described in claims 1 or 2 or 4 or 5 or 8 or 10 or 11 or 12, feature exist It is integrated on a circuit board in: the energy collection unit and the detection of magnetic field unit and is set to a chip package shell It is interior.

Technical field

The present invention relates to a kind of magnetic field sensing chips.

Background technique

With the quick emergence of the emerging fields such as Internet of Things, sensor technology is also developed rapidly.Magnetic field is as object The important component in the matter world, magnetic field sensing have important technology and economic significance.The magnetic field sensing technology being currently known There are Fluxgate Technique, superconductive quantum interference technology, magneto-resistor technology and Hall technology etc..Due to sensing technology towards it is integrated, Micromation direction is developed, and Hall technology and magneto-resistor technology are also welcoming development as the magnetic sensing technology for can integrate Peak.

Either Hall sensor or magnetoresistive sensor, Magnetic Sensor itself are used as active device, need stable electricity Potential source or current source guarantee its work.And although Hall technology technical maturity is high, performance and market manifestation are stablized, Due to its power consumption height, sensitivity is relatively low, and market is gradually replaced by magneto-resistive transducing technology.Although magneto-resistive transducing technology Energy consumption is lower, but is also required to additional power source objectively to guarantee its working condition, especially in certain special application fields, Such as the current detecting in high voltage transmission line, the work for replacing power supply is very complicated, and at high cost.If Magnetic Sensor can be from answering With electric energy is obtained in environment, by the very big maintenance cost for reducing system.

Summary of the invention

The purpose of the present invention is to provide one kind to obtain energy from external environment, realizes self-powered Magnetic Sensor core Piece.

To achieve the goals above, the present invention takes following technical solution:

Self-powered magnetic sensor chip, comprising: detection of magnetic field unit, the detection of magnetic field unit are magnetoresistive sensor；Energy Collector unit is measured, the energy collection unit is used to external magnetic field being converted to electric field, power for the detection of magnetic field unit.

More specifically, the magnetoresistive sensor is TMR sensor or AMR sensor or GMR sensor.

Further, the energy collection unit is made of magnetic electric compound material.

Further, the magnetic electric compound material be by the compound more iron hetero-junctions constituted of ferromagnetic material and ferroelectric material, The energy collection unit includes ferromagnetic layer and ferroelectric layer.

More specifically, the ferromagnetic layer and the ferroelectric layer are compound by way of gluing or extension.

More specifically, energy collection unit includes the ferromagnetic layer, ferroelectric layer and ferromagnetic layer set gradually.

More specifically, the ferromagnetic layer is made of magnetostriction coefficient >=50ppm material.

More specifically, the ferromagnetic layer is made of FeGaB or CoFeB or CoFe or its alloy.

More specifically, the ferroelectric layer is made of the material of piezoelectric modulus > 500.

More specifically, the ferroelectric layer is made of AlN or PMN-PT monocrystalline or PZN-PT monocrystalline or ceramics.

It more specifically, further include rectification circuit and accumulator, the output end of the energy collection unit and the rectification Circuit is connected, and the output end of the rectification circuit is connected with the accumulator, the output end of the accumulator and the magnetic Field probe unit is connected.

More specifically, the accumulator is capacitor.

More specifically, the energy collection unit and the detection of magnetic field unit are integrated on a circuit board and are set to one In chip package shell.

From the above technical scheme, the present invention utilize magnetoelectricity technology, using can from external magnetic field obtain energy and turn Energy collection unit is made in the material for being changed to electric field, is the power supply of detection of magnetic field unit by energy collection unit, so that sensor core Piece can realize self-energizing from environment, realize internal energy closed loop, without additional power supply power supply, reduce maintenance at This；And energy technology is taken compared to solar energy, wind energy etc., magnetoelectricity technology is more stable, is more advantageous to the stabilization for maintaining measuring system Work.

Detailed description of the invention

It in order to illustrate the embodiments of the present invention more clearly, below will be to required use in embodiment or description of the prior art Attached drawing do simple introduction, it should be apparent that, drawings in the following description are only some embodiments of the invention, for ability For the those of ordinary skill of domain, without creative efforts, it can also be obtained according to these attached drawings other attached Figure.

Fig. 1 is the structural schematic diagram of the embodiment of the present invention；

Fig. 2 is the schematic diagram of detection of magnetic field of embodiment of the present invention unit；

Fig. 3 is that detection of magnetic field of embodiment of the present invention unit is in the status diagram under external magnetic field；

Fig. 4 is the circuit diagram of the embodiment of the present invention.

Specific embodiment

In order to above and other objects of the present invention, feature and advantage can be become apparent from, the embodiment of the present invention is cited below particularly, And cooperate appended diagram, it is described below in detail.

As shown in Figure 1, the magnetic sensor chip of the present embodiment includes energy collection unit 1, detection of magnetic field unit 2 and chip Package casing 3, energy collection unit 1 and detection of magnetic field unit 2 are set in chip package shell 3, and energy collection unit 1 is magnetic Field probe unit 2 is powered, and the outside of chip package shell 3 is set to the pin (not labeled) being electrically connected with detection of magnetic field unit 2. Energy collection unit 1 and detection of magnetic field unit 2 are integrated on circuit board (not shown), and pass through the internal circuit electricity on circuit board Connection.

Energy collection unit 1 is made of the magnetic electric compound material that can convert magnetic field to electric field, such as more iron hetero-junctions materials Material, more iron heterojunction materials are the composite constructions that ferromagnetic material and ferroelectric material are constituted.Energy collection unit 1 is in magnetic field environment When middle, both ends can produce voltage.In more iron heterojunction materials, ferromagnetic material is under the action of external magnetic field, shape meeting Change with the variation of magnetic field size, i.e., there is linear relationship between the deformation quantity and external magnetic field of ferromagnetic material.Ferroelectricity material Material changes in own form or when by external force, can generate voltage at the both ends of material.

As shown in Fig. 2, energy collection unit 1 includes ferromagnetic layer 4 and ferroelectric layer 5, the ferromagnetic layer 4 of the present embodiment is located at ferroelectricity The two sides of layer 5, ferromagnetic layer 4 and ferroelectric layer 5 can be (raw by ferromagnetic layer by way of sputtering growth by way of gluing or extension Grow on ferroelectric layer) it is compound, ferromagnetic layer 4 and ferroelectric layer 5 are in close contact, and higher compactness are kept, thus the deformation of ferromagnetic layer 4 Stress can be conducted to ferroelectric layer 5.Ferromagnetic layer 4 is preferably made of the biggish material of magnetostriction coefficient, such as magnetostriction system The material of number >=50ppm, further, ferromagnetic layer 4 are made of FeGaB or CoFeB or CoFe or its alloy.Ferroelectric layer 5 is preferred Be made of the biggish material of piezoelectric modulus, such as the material of piezoelectric modulus (d33) > 500, further, ferroelectric layer 5 by AlN or PMN-PT monocrystalline or PZN-PT monocrystalline or ceramics are made.

As shown in figure 3, when energy collection unit 1 is in magnetic field environment (arrow 6 in Fig. 3 indicates externally-applied magnetic field), The shape of ferromagnetic layer 4 can change with the size in magnetic field, since ferromagnetic layer 4 and ferroelectric layer 5 fit closely, ferromagnetic layer 4 Deformation can conduct deformation (the dashed region a expression generation shape of energy collection unit 1 in Fig. 3 for causing ferroelectric layer 5 to ferroelectric layer 5 Become)；When deformation occurs, internal charge can redistribute ferroelectric layer 5, and positive charge 8 and negative electrical charge 9 can be respectively to collection of energy The two sides (surface of ferromagnetic layer 4) of unit 1 are assembled, and potential difference is formed, so as to be the power supply of detection of magnetic field unit 2.

The detection of magnetic field unit 2 of the present embodiment is that TMR sensor is compared with GMR, AMR sensor, the function of TMR sensor Consumption is lower, in uW magnitude, it is only necessary to which a small amount of electric energy can maintain work, can reduce what energy consumption got on using TMR sensor Better effect.TMR sensor is by magnetosphere, insulating layer and reference layer composition, and resistance value is between magnetosphere and reference layer Opposite magnetization direction and change.When external magnetic field changes, the opposite magnetization direction between magnetosphere and reference layer can change, and realize The detecting function of external magnetic field.The structure of TMR sensor is the prior art, no longer superfluous herein to chat.

As shown in figure 4, the output end of the energy collection unit 1 of the present embodiment is connected with rectification circuit 17, rectification circuit 17 Output end be connected with accumulator 18, the output end of accumulator 18 is connected with detection of magnetic field unit 2, be detection of magnetic field unit 2 power supplies.The rectification circuit of the present embodiment is full bridge rectifier, and accumulator uses capacitor.Due to energy collection unit 1 and magnetic The working condition of field probe unit 2 is converted there are the time difference by the voltage that setting accumulator generates energy collection unit 1 It stores, can be better achieved as the power supply of detection of magnetic field unit 2 for electric energy.

Energy collection unit 1 obtains magnetic field energy from external magnetic field, and is converted to power output to rectification circuit 17, whole The signal that energy collection unit 1 exports is converted to DC signal output to accumulator 18 by current circuit 17, and accumulator 18 will Treated electric energy is further converted into stabilization signal exports to detection of magnetic field unit 2, in Fig. 4 19 and 20 tables of rectification circuit 17 Show the output high-voltage end and output low-pressure end of detection of magnetic field unit 2, magnetic outside the voltage detecting at 19 and 20 both ends of detection can be passed through The variation of field.

Energy collection unit is made using magnetic electric compound material in the present invention, and electric energy is obtained from the magnetic field of external environment and is provided It is compared to detection of magnetic field unit with generation technologies such as traditional solar energy, wind energies, it is at low cost, and also the acquisition of energy is not by day The influence of gas, it is ensured that measuring system stable operation.

Certainly, technical concept of the invention is not limited in above-described embodiment, can also design according to the present invention obtain Many different concrete schemes, for example, the TMR sensor as detection of magnetic field unit, also could alternatively be GMR sensor or AMR sensor；Rectification circuit and accumulator can also use other circuit forms with corresponding function；In addition, ferromagnetic layer It can also be varied with the number of plies of ferroelectric layer；Such as these change and equivalent transformation should be included in model of the present invention Within enclosing.