CN108663557A - Current detecting is popped one's head in - Google Patents
Current detecting is popped one's head in Download PDFInfo
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- CN108663557A CN108663557A CN201710211314.XA CN201710211314A CN108663557A CN 108663557 A CN108663557 A CN 108663557A CN 201710211314 A CN201710211314 A CN 201710211314A CN 108663557 A CN108663557 A CN 108663557A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
- G01R15/202—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices using Hall-effect devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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- General Physics & Mathematics (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
An embodiment of the present invention provides a kind of current detecting probes comprising：Magnetic core is provided with leakage field structure on magnetic core, and when conducting wire to be tested alives, the first magnetic field is generated inside magnetic core；Sensor, sensor are set to the side of magnetic core at the leakage field structure, for detecting leakage field of the magnetic core at the leakage field structure, the magnetic field intensity detected are converted to voltage value and is exported to component is amplified, the magnetic susceptibility direction of sensor is horizontal direction；Amplify component, the voltage value for exporting sensor is converted to electric current and is transferred to excitation coil；Excitation coil, under the driving of amplification component output current, the second magnetic field being generated in magnetic core, the direction in the second magnetic field is opposite with the direction in the first magnetic field；Sample resistance, when flowing through sample resistance for the electric current in excitation coil, collection voltages value, when magnetic field is zero in magnetic core, the current value of the voltage value conversion of sample resistance acquisition is the current value in conducting wire to be tested.
Description
Technical field
The present invention relates to technical field of measuring equipment, more particularly to a kind of current detecting probe.
Background technology
The application of current detecting probe is very extensive, and basic principle is to flow through the electric current of conducting wire to generate magnetic around
, in the range specification of current probe, the flux field around conducting wire is converted into Linear voltage output, can in oscillograph or
Linear voltage output is shown and analyzed in other measuring instruments.It is widely used in Switching Power Supply, motor driver, electronic rectifier
The fields such as meter, LED illumination and new energy.
Current detecting probe is in use it should be noted that the current direction of tested conducting wire, different directions are visited in current detecting
The positive and negative difference of output voltage values of head, generally has apparent mark in the annulus of probe.
Electrostatic or other high-voltage power supplies cannot be popped one's head in applied to current detecting, it otherwise may the internal Hall element of damage and electricity
Road.There are high-intensity magnetic field (near such as transformer and high current conductor) or strong-electromagnetic field (such as radio around current detecting probe
Near transmitter) when, measurement result may be incorrect.Current detecting probe can not return usually after measuring big DC current signal
Zero, the demagnetization function of popping one's head in using current detecting is needed, can just output be made to be zeroed the remanent magnetism elimination of head portion, ensured follow-up
The precision of test value.
The simple block diagram of current detecting probe in the prior art is as shown in Figure 1, current probe converter includes：Magnetic core
101, be tested conducting wire 102, Hall sensor 103, attenuator circuit 104, output amplifier 105, Hall pre-arcing road 107 and
Power amplification circuit 106.When current clamp (i.e. magnetic core) closure, when the conductor that one alives is trapped among center, correspondingly, electric current
It will appear a magnetic field in pincers.These magnetic fields make the electronics in Hall sensor deflect, and are produced in the output of Hall sensor
A raw electromotive force.Current detecting probe generates a negative-phase sequence curent according to this electromotive force and (compensates electric current, the compensation electric current
Direction it is opposite with the current direction of conductor) send the coil popped one's head in current detecting, it is zero to make the magnetic field in current clamp, to prevent
Magnetic saturation.Current detecting, which is popped one's head in, measures the actual current value of conductor according to negative-phase sequence curent.With this method, can linearly survey very much
High current is measured, the electric current of alternating current-direct current mixing is included.
With the increase of tested power frequency, Hall effect gradually weakens.When one high frequency for being free of flip-flop of measurement
It is largely the coil that current detecting probe is directly sensed by the power in magnetic field when alternating current.Current detecting is popped one's head in just
As a current transformer.Current detecting probe measured directly is induced current, rather than compensates electric current.Current detecting is popped one's head in
The output of middle power amplifier provides a low-impedance earth-return circuit for coil.
In the ac and dc current detection probe product of the prior art, the electric current using Hall sensor is all used
Detection probe, for example, as shown in Fig. 2, the needs of Hall sensor 134 that current detecting probe uses are placed on probe magnetic core 120
A cross-section end surfaces in, and in order to ensure the equivalent permeability of magnetic core do not lose need too much place Hall sensor seam
Gap is the smaller the better, generally in 0.3mm or so, proposes very high requirement to Hall sensor device in this way, common Hall passes
The height of sensor chip cannot be satisfied the requirement of height at all in 0.7mm~2mm.So the Hall sensor met the requirements needs
Special technique is used to carry out the customization of device, and the lead-out mode of sensor signal is also a problem, PCB
The selection of (Printed Circuit Board, printed circuit board) and the welding of component are not that common technique can be real
Existing.In addition, in assembling process, since Hall sensor is in the small gaps of magnetic core, magnetic core is to suddenly in assembling process
You be easy to cause damage by sensor so that directly affect the performance of current detecting probe.
Invention content
An embodiment of the present invention provides a kind of current detecting probes, to solve current detecting probe presence pair in the prior art
The technical issues of Hall sensor size and technique requires, easy damaged Hall sensor.The current detecting is popped one's head in：Magnetic
Core is provided with leakage field structure on the magnetic core, and when conducting wire to be tested alives, the first magnetic field is generated inside the magnetic core；
Sensor, the sensor are set to the side of magnetic core at the leakage field structure, for detecting the magnetic core in the leakage field
Leakage field at structure, by the magnetic field intensity detected be converted to voltage value export component to amplification, wherein the sensor
Magnetic susceptibility direction is horizontal direction；The amplification component, connect with the sensor, the electricity for exporting the sensor
Pressure value is converted to electric current and is transferred to excitation coil；The excitation coil is arranged on the magnetic core, in the first device of the amplification
Under the driving of part output current, the second magnetic field, the direction in second magnetic field and first magnetic field are generated in the magnetic core
Direction it is opposite；Sample resistance is connect with the excitation coil, flows through the sampling for the electric current in the excitation coil
When resistance, collection voltages value, when magnetic field is zero in the magnetic core, the current value of the voltage value conversion of the sample resistance acquisition
For the current value in the conducting wire to be tested.
In one embodiment, the leakage field structure is gap or groove-like structure.
In one embodiment, in the case where the leakage field structure is gap, further include：Structure member, in institute
State the side that the sensor is fixed on to the magnetic core at gap.
In one embodiment, in the case where the leakage field structure is gap, the sensor is by adhesive in institute
State the side that the magnetic core is fixed at gap.
In one embodiment, in the case where the leakage field structure is gap, the magnetic-field-sensitive core of the sensor
The center of element is overlapped with the center in the gap.
In one embodiment, in the case where the leakage field structure is gap, the width range in the gap be more than
Equal to 0.05 millimeter and it is less than or equal to 0.5 millimeter.
In one embodiment, in the case where the leakage field structure is the groove in groove-like structure, the groove setting
On the side of the magnetic core, the sensor is fixed on the side of the magnetic core in the groove, wherein the sensor
Magnetic-field-sensitive core element be aligned with the groove.
In one embodiment, in the case where the leakage field structure is the rectangular channel in groove-like structure, the rectangular channel
It is arranged on the side of the magnetic core, the sensor is mounted in the rectangular channel, wherein the sensor and the rectangle
The axial centre of magnetic core side where slot is aligned.
In one embodiment, in the case where the leakage field structure is the rectangular channel in groove-like structure, the rectangular channel
It is arranged on the side of the magnetic core, is arranged in the two side walls of the rectangular channel on the axial direction perpendicular to the magnetic core
There is opening, the openings of sizes being arranged in two side walls is different, and the sensor is mounted in the rectangular channel, wherein the biography
Sensor is aligned with the axial centre of the magnetic core side where the rectangular channel.
In one embodiment, the magnetic core is the column structure with multiple sides, and the quantity of the sensor is more
A, multiple sensors are juxtaposed on a side of the magnetic core and/or multiple described at the leakage field structure
Sensor is respectively arranged at the leakage field structure on multiple sides of the magnetic core, and each sensor connects an institute
Amplification component is stated, the amplification component of each sensor connection is connected to the excitation coil.
In embodiments of the present invention, by the way that leakage field structure is arranged on magnetic core so that when conducting wire to be tested alives,
The first magnetic field is generated inside magnetic core, and magnetic core generates leakage field at leakage field structure, by being set to magnetic core at leakage field structure
Sensor is arranged in side, and the magnetic susceptibility direction of the sensor is horizontal direction, detects leakage field, and then by amplifying component and swashing
It encourages the magnetic field intensity that coil is detected according to sensor and generates the second magnetic field in magnetic core, the direction in second magnetic field and the first magnetic
The current value of the voltage value conversion of sample resistance acquisition is determined as above-mentioned by the direction of field on the contrary, when magnetic field is zero in magnetic core
Current value in conducting wire to be tested, to realize the current detecting of conducting wire to be tested.It is level side as a result of magnetic susceptibility direction
To sensor so that the sensor at leakage field structure be mounted on magnetic core side, i.e., sensor be mounted on leakage field knot
Sensor need not be mounted among the gap of magnetic core by the side of structure, and the size of leakage field structure and the size of sensor do not have
Directly association, compared with the current detecting probe for using Hall sensor in the prior art, the application avoids the seam of magnetic core
The contradictory problems of gap size and Hall sensor size are avoided using special technique into the customization of line sensor, are simplified
The assembly that current detecting is popped one's head in the application；Since sensor need not be mounted among the gap of magnetic core, also avoid filling
The problem of with damage is caused to sensor in the process so that advantage of the current detecting probe with good reliability of the application.
Description of the drawings
Attached drawing described herein is used to provide further understanding of the present invention, and is constituted part of this application, not
Constitute limitation of the invention.In the accompanying drawings：
Fig. 1 is a kind of block diagram of current detecting probe of the prior art；
Fig. 2 is a kind of current detecting sonde configuration block diagram using Hall sensor of the prior art；
Fig. 3 is a kind of structure diagram of current detecting probe provided in an embodiment of the present invention；
Fig. 4 is the structural schematic diagram that a kind of leakage field structure provided in an embodiment of the present invention is gap；
Fig. 5 is the structural schematic diagram that a kind of leakage field structure provided in an embodiment of the present invention is groove；
Fig. 6 is the structural schematic diagram that a kind of leakage field structure provided in an embodiment of the present invention is rectangular channel；
Fig. 7 be a kind of leakage field structure provided in an embodiment of the present invention be gap when magnetic core in magnetic field schematic diagram；
Fig. 8 be a kind of leakage field structure provided in an embodiment of the present invention be gap when sensor installation after upward view；
Fig. 9 is a kind of schematic diagram for installing sensor by structure member provided in an embodiment of the present invention；
Figure 10 is the schematic diagram that a kind of sensor provided in an embodiment of the present invention is mounted on structure member；
Figure 11 be a kind of leakage field structure provided in an embodiment of the present invention be rectangular channel when magnetic core in magnetic field schematic diagram；
Figure 12 is a kind of structure diagram of sensor chip provided in an embodiment of the present invention；
Figure 13 is a kind of side view of sensor chip provided in an embodiment of the present invention；
Figure 14 is a kind of schematic diagram one of multiple sensors of setting provided in an embodiment of the present invention；
Figure 15 is a kind of schematic diagram two of multiple sensors of setting provided in an embodiment of the present invention.
Specific implementation mode
To make the objectives, technical solutions, and advantages of the present invention clearer, right with reference to embodiment and attached drawing
The present invention is described in further details.Here, the exemplary embodiment and its explanation of the present invention be for explaining the present invention, but simultaneously
It is not as a limitation of the invention.
Current detecting probe in the prior art needs to be mounted on Hall sensor in the gap of magnetic core, however magnetic core stitches
The contradictory problems of gap size and Hall sensor size so that it is required that Hall sensor needs to carry out device using special technique
Customization, and magnetic core be easy to cause damage to Hall sensor in assembling process, is existed based on existing current detecting probe
Drawbacks described above, present inventor find, due to Hall sensor magnetic susceptibility direction be vertical direction, it is therefore desirable to will suddenly
You are mounted in the gap of magnetic core sensor, in this regard, applicant proposes above-mentioned current detecting probe, propose to use magnetic susceptibility direction
The leakage field of magnetic core is detected for the sensor of horizontal direction, i.e. sensor is mounted on the side of magnetic core at leakage field structure,
Sensor need not be mounted in gap, to solve the existing existing drawbacks described above of current detecting probe.
In embodiments of the present invention, a kind of current detecting probe is provided, as shown in figure 3, current detecting probe includes：
Magnetic core 301 is provided with leakage field structure 307 on the magnetic core, for when conducting wire 302 to be tested alives, institute
It states and generates the first magnetic field (as shown in figure 3, the arrow at conducting wire to be tested 302 in magnetic core indicates the first magnetic field) inside magnetic core；
Sensor 303, the sensor is set to the side of magnetic core at the leakage field structure, for detecting the magnetic core
Leakage field at the leakage field structure, by the magnetic field intensity detected be converted to voltage value export component 304 to amplification,
In, the magnetic susceptibility direction of the sensor is horizontal direction；
The amplification component 304, connect, the voltage value for exporting the sensor is converted to the sensor
Electric current is transferred to excitation coil；
The excitation coil 305 is arranged on the magnetic core, for the driving in the amplification component output current
Under, the second magnetic field is generated in the magnetic core (as Fig. 3 institutes 305 show that the arrow at excitation coil 305 in magnetic core indicates the second magnetic
), the direction in second magnetic field is opposite with the direction in the first magnetic field；
Sample resistance 306 is connect with the excitation coil, flows through the sampling for the electric current in the excitation coil
When resistance, collection voltages value, when magnetic field is zero in the magnetic core, the current value of the voltage value conversion of the sample resistance acquisition
For the current value in the conducting wire to be tested.
As shown in Figure 3 it is found that in embodiments of the present invention, passing through the setting leakage field structure on magnetic core so as to be tested
When conducting wire alives, the first magnetic field is generated inside magnetic core, and magnetic core generates leakage field at leakage field structure, by leakage field structure
Place is set to the side setting sensor of magnetic core, and the magnetic susceptibility direction of the sensor is horizontal direction, detects leakage field, and then pass through
The magnetic field intensity that amplification component and excitation coil are detected according to sensor generates the second magnetic field in magnetic core, second magnetic field
Direction and the first magnetic field direction on the contrary, when magnetic field is zero in magnetic core, by the electricity of the voltage value conversion of sample resistance acquisition
Flow valuve is determined as the current value in above-mentioned conducting wire to be tested, to realize the current detecting of conducting wire to be tested.As a result of magnetosensitive
Feel the sensor that direction is horizontal direction so that the sensor is mounted on the side of magnetic core at leakage field structure, that is, senses
Device is mounted on the side of leakage field structure, need not be mounted on sensor among the gap of magnetic core, the size and biography of leakage field structure
The size of sensor is not associated with directly, compared with the current detecting probe for using Hall sensor in the prior art, the application
The contradictory problems for avoiding the gap size and Hall sensor size of magnetic core avoid and use special technique into line sensor
Customization, simplify the assembly that current detecting in the application is popped one's head in；Since sensor need not be mounted in the gap of magnetic core
Between, the problem of also avoiding causing damage to sensor in assembling process so that the current detecting probe of the application has reliable
The good advantage of property.
When it is implemented, as shown in figure 3, above-mentioned current detecting probe can also include：Magnetic field shielding case 308, above-mentioned electricity
Stream detection probe is placed in the magnetic field shielding case 308；Buffering device 309 is connect with the sample resistance 306, is taken described
The voltage value output that sample resistance 306 acquires, to obtain the corresponding voltage value of electric current in conducting wire to be tested.
When it is implemented, the specific location the application of above-mentioned leakage field structure on magnetic core does not limit, for example, such as Fig. 4 institutes
Show, leakage field structure, which can be arranged, can also be arranged between two excitation coils in other positions.
When it is implemented, the sensor, which is placed on leakage field structure, generates stray field field strength maximum position, sensor with
The distance between magnetic core side can specifically be adjusted for different situations, for example, in the case where magnetic core is narrower, gap is smaller,
Sensor is closer from magnetic core side, conversely, then remoter.
When it is implemented, the production technology for the structure and magnetic core of jaw of being popped one's head according to current detecting, above-mentioned magnetic core can be
Square structure can also be trapezium structure, and the application is not specifically limited, and the application is by taking the magnetic core of square structure as an example.
When it is implemented, leakage field structure is provided on magnetic core 301, so that magnetic core generates leakage field at leakage field structure,
In the present embodiment, above-mentioned leakage field structure 307 can be gap 3071 (as shown in Figure 4) or groove-like structure, which can
To be groove 3072 (as shown in Figure 5) or rectangular channel 3073 (as shown in Figure 6).When leakage field structure is gap, with magnetic core
Leakage field magnetic field intensity is larger, electric property preferably a little.When leakage field structure is groove, assembly complete with core body
Simply a little (because of the rigging position for only needing control sensor).When leakage field structure is rectangular channel, there is assembly
Simply, sensor is not easy by external magnetic field interference, noiseproof feature preferably a little.
When it is implemented, in the case where the leakage field structure is gap 3071, the magnetic-field-sensitive core of the sensor
The center of element is overlapped with the center in the gap, specifically, as shown in Fig. 4,7,8, at gap 3071, sensor 303 is put
It sets in the lower side position of magnetic core 301, the center of the magnetic-field-sensitive core element of sensor is overlapped with the center in gap 3071,
The horizontal leakage field magnetic field intensity that sensor detects in this way is maximum.Because magnetic field intensity is with remoter at a distance from magnetic core direction
Intensity is smaller, and therefore, when installing sensor, the magnetic-field-sensitive core element of sensor is needed apart from magnetic core surface distance ratio
It is smaller.Specifically, the magnetic field in magnetic core can be because crack the reasons in structure such as gap or fluting, in the corresponding positions of gap or fluting of cracking
It sets place and generates certain leakage field phenomenon, as shown in fig. 7, (magnetic field may be above-mentioned first magnetic field may also for the magnetic field in magnetic core
It is above-mentioned second magnetic field) as shown in 701 in Fig. 7, the leakage field of generation is as shown in the curve 702 with the arrow in Fig. 7, leakage field warp
Cross sensor, wherein the direction in the magnetic field in magnetic core may be it is horizontal to the left or it is horizontal to the right, depend on electricity in tested conducting wire
The magnetic direction that the direction of stream and excitation coil generate.
When it is implemented, in order to realize the side that sensor is set to magnetic core at leakage field structure, in the present embodiment,
As shown in figure 9, in the case where the leakage field structure is gap, above-mentioned current detecting probe further includes：Structure member 310 is used
In the side that the sensor 303 is fixed on to the magnetic core 301 at the gap 3071.Structure member 310 can be appointed
Meaning tooling, as long as structure member 310 can ensure sensor being fixed at gap, the application is to structure member 310
Concrete structure does not limit, and structure member 310 ensures that sensor is bonded closely with magnetic core surface, and ensures that the magnetic field of sensor is quick
The center of sense core element is aligned with the middle in gap.Specifically, as shown in Figure 10, it can be by sensor and structure member
310 fixations are put together.
When it is implemented, in order to realize the side that sensor is set to magnetic core at leakage field structure, in the present embodiment,
In the case where the leakage field structure is gap, sensor can also be fixed on the magnetic at the gap by adhesive
The side of core.For example, smearing adhesive in sensor surface, sensor is adhered directly on the side of magnetic core, ensures sensing
Device is bonded closely with magnetic core surface, and ensures that the center of magnetic-field-sensitive core element of sensor is aligned with the middle in gap.
When it is implemented, in the case where the leakage field structure is gap, the width range in the gap can be more than
It is equal to 0.05 millimeter and best less than or equal to 0.5 millimeter, the equivalent permeability of magnetic core is influenced with minimum degree.
When it is implemented, as shown in figure 5, the leakage field structure be groove-like structure in groove in the case of, it is described recessed
Slot 3072 is arranged on the side of the magnetic core, and the sensor 303 is fixed on the magnetic core 301 at the groove 3072
Side, wherein the magnetic-field-sensitive core element of the sensor is aligned with the groove.Specifically, knot can also be passed through at this time
Sensor 303 is fixed on the side of the magnetic core 301 by structure component 310 or adhesive at groove 3072.
When it is implemented, as shown in Fig. 6,11, rectangular channel 3073 during the leakage field structure is groove-like structure the case where
Under, the rectangular channel 3073 is arranged on the side of the magnetic core, and the sensor 303 is mounted in the rectangular channel 3073,
Wherein, the sensor is aligned with the axial centre of the magnetic core side where the rectangular channel.
When it is implemented, in the case where the leakage field structure is the rectangular channel in groove-like structure, the rectangular channel setting
On the side of the magnetic core, it is provided with out in the two side walls of the rectangular channel on the axial direction perpendicular to the magnetic core
Mouthful, the openings of sizes being arranged in two side walls is different, and the sensor is mounted in the rectangular channel, wherein the sensor
It is aligned with the axial centre of the magnetic core side where the rectangular channel.
When it is implemented, the sensor can be magnetoresistance effect sensor (Tunnel Magneto
Resistance, referred to as TMR), anisotropic magnetoresistance sensor (Anisotropic Magneto Resistance, letter
Referred to as AMR) or giant magnetoresistance sensor (Giant Magneto Resistance, referred to as GMR).
Specifically, the sensor is magnetoresistance effect sensor (as shown in Figure 12,13, magnetoresistance effect sensor core
Piece includes pin 1201 and magnetic-field-sensitive core element 1202) when, effect is preferable.Magnetoresistance effect sensor (TMR) is novel
Magnetoresistance effect sensor, using be that the tunneling magnetoresistance of Researches for Magnetic Multilayer Films incudes magnetic field, have
Better temperature stability, higher sensitivity, lower power consumption, the better linearity.
And Hall sensor is the sensor made using Hall effect, i.e., when electric current passes through conductor perpendicular to external magnetic field
When, carrier deflects, and will produce an additional electric field perpendicular to the direction in electric current and magnetic field, to be generated at the both ends of conductor
Potential difference, output voltage signal.
Two kinds of sensors the difference is that：
(1) magnetic-field-sensitive direction is different.Hall sensor is the magnetic-field-sensitive to vertical direction, and TMR is to horizontal direction
Magnetic-field-sensitive.
(2) TMR has higher sensitivity, and more than 1000 times is higher by compared to Hall sensor.
When it is implemented, for the precision for improving probe measurement and minimum rate respectively, what raising was popped one's head on the whole can
By property, in the present embodiment, the quantity of the sensor is multiple, and multiple sensors are set side by side at the leakage field structure
It is placed on a side of the magnetic core and/or multiple sensors is respectively arranged at the magnetic core at the leakage field structure
Multiple sides on, each sensor connects an amplification component, the amplification member of each sensor connection
Device is connected to the excitation coil.
Specifically, multiple sensors are juxtaposed at the leakage field structure on a side of the magnetic core,
The amplification component of each sensor connection is connected to the excitation coil, for example, as shown in figure 14, being sensed with two
For device 303, which is juxtaposed on institute at the leakage field structure (leakage field structure is by taking gap as an example at this time)
It states on a side of magnetic core, two sensors 303 are separately connected an amplification component 304, and two sensors 303 connect
The amplification component 304 connect is connected to the excitation coil 305, realizes that two sensors 303 are in parallel, two sensors
The voltage of 303 outputs is converted to electric current by amplification component and is transferred to excitation coil, at this point, the second of excitation coil generation
Magnetic field is the summation for the leakage field that two sensors 303 detect, therefore, when magnetic field is zero in the magnetic core, sample resistance is adopted
The voltage value of collection is the summation of the voltage for the leakage field conversion that two sensors 303 detect, the current value of voltage summation conversion
For the current value in the conducting wire to be tested.
Specifically, multiple sensors are respectively arranged at the leakage field structure on multiple sides of the magnetic core,
For example, as shown in figure 15, by taking two sensors 303 as an example, two sensors 303 are in leakage field structure (the leakage field knot at this time
Structure is by taking groove as an example) at be respectively arranged on two symmetric sides of the magnetic core, two sensors 303 are separately connected one and put
The amplification component 304 of big component 304, the connection of two sensors 303 is connected to the excitation coil 305, realizes
Two sensors 303 are in parallel, the voltage of two sensors 303 output by amplify component be converted to electric current be transferred to it is sharp
Coil is encouraged, at this point, the second magnetic field that excitation coil generates is the summation for the leakage field that two sensors 303 detect, therefore, in institute
When stating that magnetic field is zero in magnetic core, the voltage value of sample resistance acquisition is the voltage for the leakage field conversion that two sensors 303 detect
Summation, the voltage summation conversion current value be the conducting wire to be tested in current value.
In embodiments of the present invention, by the way that leakage field structure is arranged on magnetic core so that when conducting wire to be tested alives,
The first magnetic field is generated inside magnetic core, and magnetic core generates leakage field at leakage field structure, by being set to magnetic core at leakage field structure
Sensor is arranged in side, and the magnetic susceptibility direction of the sensor is horizontal direction, detects leakage field, and then by amplifying component and swashing
It encourages the magnetic field intensity that coil is detected according to sensor and generates the second magnetic field in magnetic core, the direction in second magnetic field and the first magnetic
The current value of the voltage value conversion of sample resistance acquisition is determined as above-mentioned by the direction of field on the contrary, when magnetic field is zero in magnetic core
Current value in conducting wire to be tested, to realize the current detecting of conducting wire to be tested.It is level side as a result of magnetic susceptibility direction
To sensor so that the sensor at leakage field structure be mounted on magnetic core side, i.e., sensor be mounted on leakage field knot
Sensor need not be mounted among the gap of magnetic core by the side of structure, and the size of leakage field structure and the size of sensor do not have
Directly association, compared with the current detecting probe for using Hall sensor in the prior art, the application avoids the seam of magnetic core
The contradictory problems of gap size and Hall sensor size are avoided using special technique into the customization of line sensor, are simplified
The assembly that current detecting is popped one's head in the application；Since sensor need not be mounted among the gap of magnetic core, also avoid filling
The problem of with damage is caused to sensor in the process so that advantage of the current detecting probe with good reliability of the application.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the embodiment of the present invention can have various modifications and variations.All within the spirits and principles of the present invention, made by
Any modification, equivalent substitution, improvement and etc. should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of current detecting probe, which is characterized in that including：
Magnetic core is provided with leakage field structure on the magnetic core, and when conducting wire to be tested alives, first is generated inside the magnetic core
Magnetic field；
Sensor, the sensor are set to the side of magnetic core at the leakage field structure, for detecting the magnetic core described
Leakage field at leakage field structure, by the magnetic field intensity detected be converted to voltage value export component to amplification, wherein the sensing
The magnetic susceptibility direction of device is horizontal direction；
The amplification component, connect with the sensor, and the voltage value for exporting the sensor is converted to electric current biography
It is defeated by excitation coil；
The excitation coil is arranged on the magnetic core, is used under the driving of the amplification component output current, described
The second magnetic field is generated in magnetic core, the direction in second magnetic field is opposite with the direction in the first magnetic field；
Sample resistance is connect with the excitation coil, when flowing through the sample resistance for the electric current in the excitation coil,
Collection voltages value, when magnetic field is zero in the magnetic core, the current value of the voltage value conversion of the sample resistance acquisition is described
Current value in conducting wire to be tested.
2. current detecting probe as described in claim 1, which is characterized in that the leakage field structure is gap or groove-like structure.
3. current detecting probe as claimed in claim 2, which is characterized in that in the case where the leakage field structure is gap,
Further include：
Structure member, the side for the sensor to be fixed on to the magnetic core at the gap.
4. current detecting probe as claimed in claim 2, which is characterized in that in the case where the leakage field structure is gap,
The sensor is fixed on the side of the magnetic core by adhesive at the gap.
5. current detecting probe as claimed in claim 2, which is characterized in that in the case where the leakage field structure is gap,
The center of the magnetic-field-sensitive core element of the sensor is overlapped with the center in the gap.
6. current detecting probe as claimed in claim 2, which is characterized in that in the case where the leakage field structure is gap,
The width range in the gap is more than or equal to 0.05 millimeter and to be less than or equal to 0.5 millimeter.
7. current detecting probe as claimed in claim 2, which is characterized in that recessed in the leakage field structure is groove-like structure
In the case of slot, the groove is arranged on the side of the magnetic core, and the sensor is fixed on the magnetic in the groove
The side of core, wherein the magnetic-field-sensitive core element of the sensor is aligned with the groove.
8. current detecting probe as claimed in claim 2, which is characterized in that the square in the leakage field structure is groove-like structure
In the case of shape slot, the rectangular channel is arranged on the side of the magnetic core, and the sensor is mounted in the rectangular channel,
In, the sensor is aligned with the axial centre of the magnetic core side where the rectangular channel.
9. current detecting probe as claimed in claim 2, which is characterized in that the square in the leakage field structure is groove-like structure
In the case of shape slot, the rectangular channel is arranged on the side of the magnetic core, the institute on the axial direction perpendicular to the magnetic core
It states and is provided with opening in the two side walls of rectangular channel, the openings of sizes being arranged in two side walls is different, and the sensor is mounted on
In the rectangular channel, wherein the sensor is aligned with the axial centre of the magnetic core side where the rectangular channel.
10. as current detecting described in any item of the claim 1 to 8 is popped one's head in, which is characterized in that the magnetic core is with multiple
The quantity of the column structure of side, the sensor is multiple, and multiple sensors are set up in parallel at the leakage field structure
In on a side of the magnetic core and/or multiple sensors are respectively arranged at the magnetic core at the leakage field structure
On multiple sides, each sensor connects an amplification component, the amplification member device of each sensor connection
Part is connected to the excitation coil.
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| CN201710211314.XA CN108663557A (en) | 2017-03-31 | 2017-03-31 | Current detecting is popped one's head in |
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| CN201710211314.XA CN108663557A (en) | 2017-03-31 | 2017-03-31 | Current detecting is popped one's head in |
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