CN109946499A - Current detection means based on PCB - Google Patents
Current detection means based on PCB Download PDFInfo
- Publication number
- CN109946499A CN109946499A CN201910190635.5A CN201910190635A CN109946499A CN 109946499 A CN109946499 A CN 109946499A CN 201910190635 A CN201910190635 A CN 201910190635A CN 109946499 A CN109946499 A CN 109946499A
- Authority
- CN
- China
- Prior art keywords
- magneto
- resistor
- straight wire
- wire
- pcb
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 47
- 238000012545 processing Methods 0.000 claims abstract description 19
- 239000002184 metal Substances 0.000 claims description 6
- 230000006698 induction Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 5
- 239000013598 vector Substances 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000005684 electric field Effects 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 206010037660 Pyrexia Diseases 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000008447 perception Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Abstract
The invention discloses the current detection means based on PCB, one of which includes: pcb board body；Conducting wire is printed on the first surface of pcb board body；Conducting wire includes the first straight wire and the second straight wire being parallel to each other, and its privates portion is connected from side, and privates portion is symmetrical about line of symmetry, and line of symmetry is parallel with the first straight wire, the second straight wire；First magneto-resistor, the second magneto-resistor, are set to the second surface of pcb board body；The projection of plane is located at the outside of the first straight wire and the second straight wire where each comfortable conducting wire of first magneto-resistor, the second magneto-resistor；First magneto-resistor is identical with the magnetic susceptibility direction of the second magneto-resistor, and parallel with pcb board body and vertical with line of symmetry；First magneto-resistor and the series connection of the second magneto-resistor, the both ends after series connection connect power supply；Signal processing module, input terminal are connected between the first magneto-resistor and the second magneto-resistor.Precision is higher when the device detects lesser electric current to be measured.
Description
Technical field
The present invention relates to current sensing techniques fields, and in particular to the current detection means based on PCB.
Background technique
Current detecting product is widely used in new energy, intelligent transportation, Industry Control, intelligent appliance and smart grid etc.
Field.Current detecting product is usually the chip encapsulated, and at least two pins of chip are respectively used to introduce or draw electricity to be measured
Stream, in the inside of current detecting chip, the two pins are also to be connected by conducting wire；Perception magnetic field is actually used in realize inspection
The Magnetic Sensor for surveying function of current is also packaged in the chip, and Magnetic Sensor is close to the conducting wire for connecting above-mentioned two pin.
This current detecting chip suffers from the drawback that the pressure resistance of (1) chip is lower；(2) section of the conducting wire of above-mentioned two pins of connection
Area is smaller and makes that its internal resistance is larger, power consumption is larger, and the encapsulation of chip type is so that heat dissipation effect is poor, so that chip is easy in addition
Fever.
To solve above-mentioned drawback, the prior art provides the current detection means based on PCB, as shown in FIG. 1A and 1B,
This current detecting product includes Magnetic Sensor 1, conducting wire 2 and pcb board 3 for passing to electric current to be measured, wherein Magnetic Sensor 1
It is separately positioned on two apparent surfaces of pcb board 3 with conducting wire 2, the "×" in conducting wire 2 indicates the electric current to be circulated in conducting wire
Direction (i.e. from where reader paper or screen side be directed toward the other side).Due to there is pcb board 3 between Magnetic Sensor 1 and conducting wire 2
As interval, the magnetic field strength to be perceived of Magnetic Sensor 1 can be reduced in the case where size of current to be measured is constant, therefore is mentioned
The pressure resistance of high current testing product, and detection device can be further increased by adjusting the thickness and size of pcb board
Pressure resistance.Conducting wire 2 can make pcb board when be printed on plate body, can and convenient for conducting wire 2 is printed to various shape
Increase the width of conductor cross-section, to reduce the internal resistance of conducting wire, reduce its power consumption, the conducting wire radiating surface printed in addition makes more greatly it
Heat dissipation effect is preferable, therefore the current detection means based on PCB less easily generates heat.
However, it is found by the inventors that the existing current detection means based on PCB be relatively suitable for measuring biggish electric current (such as
The electric current of 30A or more), and then measurement accuracy is inadequate for lesser electric current (such as 30A electric current below).
Summary of the invention
In view of this, the embodiment of the invention provides the current detection means based on PCB, to solve existing method to smaller
The inadequate problem of current measurement precision.
According in a first aspect, the embodiment of the invention provides a kind of current detection means based on PCB, comprising: pcb board
Body；Conducting wire is printed on the first surface of the pcb board body, for passing to electric current to be measured；The conducting wire includes to be parallel to each other
One straight wire and the second straight wire, and its privates portion is connected from side, the privates portion is about balanced pair
Claim, the line of symmetry is parallel with the first straight wire, the second straight wire, and basic with the spacing of the first straight wire, the second straight wire
It is equal；First magneto-resistor, the second magneto-resistor are set to the second surface of the pcb board body, the second surface and described first
Surface is opposite；The projection of plane is located at institute where first magneto-resistor, each leisure of second magneto-resistor conducting wire
State the outside of the first straight wire and second straight wire；The magnetic susceptibility direction of first magneto-resistor and second magneto-resistor
It is identical and parallel with the pcb board body and vertical with the line of symmetry；First magneto-resistor and second magneto-resistor
Series connection, the both ends after series connection connect power supply；Signal processing module, input terminal are connected to first magneto-resistor and described second
Between magneto-resistor, electric current to be measured is exported for obtaining according to the electric signal between first magneto-resistor and second magneto-resistor
Value.
According to second aspect, the embodiment of the invention provides a kind of current detection means based on PCB, comprising: pcb board
Body；Conducting wire is printed on the first surface of the pcb board body, for passing to electric current to be measured；The conducting wire includes to be parallel to each other
One straight wire and the second straight wire, and its privates portion is connected from side, the privates portion is about balanced pair
Claim, the line of symmetry is parallel with the first straight wire, the second straight wire, and basic with the spacing of the first straight wire, the second straight wire
It is equal；First magneto-resistor, the second magneto-resistor, third magneto-resistor, the 4th magneto-resistor are set to the second surface of the pcb board body,
The second surface is opposite with the first surface；Also, it is led described in each leisure of first magneto-resistor, the 4th magneto-resistor
The projection of plane where line is located at the same side outside first straight wire and second straight wire, second magnetoelectricity
The projection of plane is located at first straight wire and described second and directly leads where resistance, each leisure of third magneto-resistor conducting wire
The other side outside line；First magneto-resistor and second magneto-resistor series connection, both ends after series connection connect power supply, and described the
Three magneto-resistors and the 4th magneto-resistor series connection, the both ends after series connection connect the power supply, and first magneto-resistor and institute
State the same end that third magneto-resistor is connected to the power supply；Each leisure of two magneto-resistors conducting wire institute in same series arm
The outside of first straight wire and second straight wire is located in the projection of plane；It is first magneto-resistor, described
Second magneto-resistor, the third magneto-resistor, the magnetic susceptibility direction of the 4th magneto-resistor are identical, and flat with the PCB plate body
Row, and it is vertical with the line of symmetry；Signal processing module, first input end are connected to first magneto-resistor and described second
Between magneto-resistor, the second input terminal is connected between the third magneto-resistor and the 4th magneto-resistor；The signal processing mould
Block is used for according to the electric signal between first magneto-resistor and second magneto-resistor, the third magneto-resistor and the described 4th
Electric signal between magneto-resistor obtains current value to be measured.
Optionally, the privates portion be rectangle or round rectangle with opening, and the long side of rectangle with it is described
Line of symmetry is vertical.
Optionally, the privates portion is the straight wire vertical with the line of symmetry；Also, first magneto-resistor and
Second magneto-resistor is located at the same side of the middle line of first straight wire or second straight wire.
Optionally, the conducting wire further include: the 4th straight wire, the 5th straight wire, it is vertical with the line of symmetry, and point
It is not connected to the end of the first straight wire, the second straight wire.
Optionally, the signal processing module is operational amplifier.
Optionally, described device includes at least three detection units, and the detection unit includes each magneto-resistor and described
Conducting wire.
Optionally, at least three conducting wires are respectively used to pass to three-phase current.
Optionally, described device further includes metal cap, is set to the second surface of the pcb board, and each magneto-resistor
And/or the signal processing module is located in the metal cap.
Current detection means based on PCB provided by the embodiment of the present invention, for an equal amount of electric current to be measured, output
Value is bigger, and precision is higher when detecting lesser electric current to be measured.
Detailed description of the invention
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art be briefly described, it should be apparent that, it is described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, is also possible to obtain other drawings based on these drawings.
Figure 1A shows the side view of the existing current detection means based on PCB；
Figure 1B shows the general structure schematic diagram of the existing current detection means based on PCB；
Fig. 2 shows a kind of side views of the current detection means based on PCB according to an embodiment of the present invention；
Fig. 3 A shows a kind of top view of current detection means based on PCB according to an embodiment of the present invention；
Fig. 3 B shows the top view of another current detection means based on PCB according to an embodiment of the present invention；
Fig. 4 show Fig. 2, Fig. 3 A, in Fig. 3 B two magneto-resistors electrical connection；
Fig. 5 shows a kind of electrical connection schematic diagram of operational amplifier suitable for Fig. 4；
Fig. 6 shows the side view of another current detection means based on PCB according to an embodiment of the present invention；
Fig. 7 A shows the top view of another current detection means based on PCB according to an embodiment of the present invention；
Fig. 7 B shows the top view of another current detection means based on PCB according to an embodiment of the present invention；
Fig. 8 show Fig. 6, Fig. 7 A, in Fig. 7 B two magneto-resistors electrical connection；
Fig. 9 shows a kind of electrical connection schematic diagram of operational amplifier suitable for Fig. 8；
Figure 10 shows the current detection means based on PCB and includes three detection units and be respectively used to pass to three-phase current
Schematic diagram.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those skilled in the art are not having
Every other embodiment obtained under the premise of creative work is made, shall fall within the protection scope of the present invention.
It needs to illustrate in advance, the magnetic susceptibility direction in the application is direction vector, has both included " when the magnetic field of the direction
When increase, the direction (also referred to as positive magnetic susceptibility direction) of the positive output value increase of magneto sensor ", also include " when the magnetic field of the direction
When increase, the direction (also referred to as negative magnetic susceptibility direction) of the positive output value reduction of magneto sensor ".
Also arrange in the application: when only referring to magnetic susceptibility direction, which had not only included positive magnetic susceptibility direction, but also
Including negative magnetic susceptibility direction, positive and negative direction is not distinguished；And when referring to that magnetic susceptibility direction is identical, opposite, distinguish positive magnetosensitive
Feel direction, negative magnetic susceptibility direction, namely " magnetic susceptibility direction is identical " refers to that magnetic susceptibility direction is positive and magnetic susceptibility direction or be
Negative magnetic susceptibility direction, " magnetic susceptibility is contrary " refer to that be positive magnetic susceptibility direction, another one of one is negative magnetic susceptibility direction.
Embodiment one
The embodiment of the invention provides a kind of current detection means based on PCB, and Fig. 2 shows its side view, Fig. 3 A shows
A kind of its top view is gone out, Fig. 3 B shows its another top view, wherein the bar-shaped zone of filling indicates conducting wire, internal empty
Line arrow indicates current direction.The device includes the first magneto-resistor 11, the second magneto-resistor 12, conducting wire 20, pcb board body 30 and signal
Processing module (is not shown) in Fig. 2, Fig. 3 A and Fig. 3 B.
Conducting wire 20 is printed on the first surface of pcb board body 30, for passing to electric current to be measured.Conducting wire 20 includes being parallel to each other
First straight wire and the second straight wire (i.e. two straight wires in Fig. 3 A and Fig. 3 B in circular dashed line frame), and connected from side
Its privates portion (i.e. such as the conducting wire in Fig. 3 A and Fig. 3 B in the rectangular broken line frame of left side), privates portion is about balanced pair
Claim, line of symmetry is parallel with the first straight wire, the second straight wire, and of substantially equal with the spacing of the first straight wire, the second straight wire.
First magneto-resistor 11, the second magneto-resistor 12 are set to the second surface of pcb board body 30, second surface and first surface
Relatively.The projection of first magneto-resistor 11, the second magneto-resistor 12 20 place plane of each comfortable conducting wire be located at the first straight wire and
The outside of second straight wire.The first straight wire and the second straight wire are treated as a whole in the application, " the first straight wire
And second straight wire inside " refer between two straight wires, " outside " and " inside " of the first straight wire and the second straight wire
Relatively.First magneto-resistor 11 and the series connection of the second magneto-resistor 12, the both ends after series connection connect power supply.
The input terminal of signal processing module is connected between the first magneto-resistor 11 and the second magneto-resistor 12, for according to first
Electric signal between magneto-resistor 11 and the second magneto-resistor 12, which obtains, exports current value to be measured.
Assuming that the first magneto-resistor 11 is R1=R0+k·B1, wherein R0It in magnetic induction intensity is zero for the first magneto-resistor 11
When resistance value, B1For the magnetic induction intensity where the first magneto-resistor 11, k is the change rate of the first magneto-resistor 11；Second magnetoelectricity
The resistance value of resistance 12 is R2=R0+k·B2, wherein R0For resistance value of second magneto-resistor 12 when magnetic induction intensity is zero, (magnetic induction is strong
When degree is zero, the resistance value of the first magneto-resistor 11 and the second magneto-resistor 12 is equal), B2For the magnetic strength where the second magneto-resistor 12
Intensity is answered, k is the change rate of the second magneto-resistor 12.So, the voltage between the first magneto-resistor 11 and the second magneto-resistor 12 is
Wherein, VccFor supply voltage.
When not passing to electric current in conducting wire, the voltage between the first magneto-resistor 11 and the second magneto-resistor 12 should be V0=
Vcc/2.So upon power-up, output voltage and V between the first magneto-resistor 11 and the second magneto-resistor 120Difference are as follows:
It should be noted that in the final step that above-mentioned formula (1) derives, due to R under actual conditions0Numerical value it is often remote
Much larger than B1And B2Numerical value, thus 2R0+k·(B1+B2) it can be approximated to be 2R0, to obtain the most termination of above-mentioned formula (1)
Fruit.
It can be seen that according to the final result of above-mentioned formula (1) according between the first magneto-resistor 11 and the second magneto-resistor 12
The voltage value of output and the difference of reference value can obtain current value to be measured, and electric current to be measured output result depends on first
The difference of magneto-resistor 11,12 position magnetic induction intensity of the second magneto-resistor.
As shown in Figure 3A and Figure 3B, by the current direction that is circulated in the first straight wire and the second straight wire on the contrary, because
Magnetic direction caused by this first straight wire and the second straight wire is opposite.Assuming that the first magneto-resistor 11 is directly led closer to first
Line, the second magneto-resistor 12 is closer to the second straight wire, then as shown in Fig. 3 A and Fig. 3 B, the first magneto-resistor 11 and the second magneto-resistor
The integrated magnetic field of effect " straight wire " of 12 positions should be located at z-axis direction shown in figure (z-axis direction, be
Conducting wire in the plane and the direction vertical with line of symmetry) on, and it is contrary.Since privates portion is about line of symmetry
Symmetrically, have in privates portion, in the magnetic field that the first magneto-resistor 11 and 12 position of the second magneto-resistor generate in z-axis direction
Important part conducting wire (conducting wire of x-axis direction in the rectangular broken line frame of left side in the part conducting wire, that is, Fig. 3 A and Fig. 3 B) is first
Magnetic field caused by magneto-resistor 11 and the second magneto-resistor 12 is equal in magnitude, contrary, and the sum of vector of the two is 0.
According to above-mentioned analysis, in above-mentioned formula (1), magnetic induction density B1And B2Numerical value be opposite, and formula (1)
Final result be solely dependent upon B1And B2The sum of numerical value (i.e. | B1|+|B2|), magnetic field caused by privates portion can't shadow
The final result of formula (1) is rung, therefore, for an equal amount of electric current to be measured, the embodiment of the present invention is provided based on PCB's
The output valve of current detection means is bigger, and precision is higher when detecting lesser electric current to be measured.
Assuming that magnetic strength of the magnetic field caused by the first straight wire and the second straight wire in 11 position of the first magneto-resistor
Answering intensity is b1(b1For numerical value), it is-b in the magnetic induction intensity of 12 position of the second magneto-resistor2 (b2For numerical value), it is extraneous
Interference magnetic field is b in the magnetic induction intensity of the first magneto-resistor 11,12 position of the second magneto-resistor0(i.e. common mode interference),
Then above-mentioned vector B1=b1+b0, B2=-b2+b0, then the difference B of the two vectors2=b1-b2Namely testing result is not by common mode
The influence of interference.It can be seen that the anti-external magnetic field of current detection means provided by the embodiment of the present invention based on PCB interfered
Ability is stronger.
It it should be noted that above-mentioned reference value can be chosen for the half of supply voltage value, or may be that other are fixed
Numerical value.For " according between the first magneto-resistor 11 and the second magneto-resistor 12 difference of the voltage value exported and reference value obtain to
The signal processing module of survey current value " can be operational amplifier and its peripheral circuit, as shown in Figure 4 and Figure 5, operational amplifier
First input end be connected between the first magneto-resistor 11 and the second magneto-resistor 12, the second input terminal connects reference voltage, in figure
VoFor the voltage between the first magneto-resistor 11 and the second magneto-resistor 12, VrefFor reference voltage, supply voltage value can be set to
Half, i.e. Vcc/2；Alternatively, be also possible to include processor chips module, or be also possible to other electronic circuits, the application
Without limitation.
Embodiment two
Current detection means the embodiment of the invention provides another kind based on PCB, Fig. 6 show its side view, Fig. 7 A
A kind of its top view is shown, Fig. 7 B shows its another top view.Comparative diagram 2, Fig. 3 A and Fig. 3 B can be seen that the present invention
Device provided by embodiment and the difference of embodiment one be, which includes four magneto-resistors, i.e. the first magneto-resistor 11, the
Two magneto-resistors 12, third magneto-resistor 13 and the 4th magneto-resistor 14, rather than two magneto-resistors.The present embodiment will be specifically introduced below
In this four magneto-resistors specific set-up mode.
First magneto-resistor 11, the second magneto-resistor 12, third magneto-resistor 13, the 4th magneto-resistor 14, are set to pcb board body 30
Second surface, second surface is opposite with first surface.It is put down where first magneto-resistor 11, each comfortable conducting wire 20 of the 4th magneto-resistor 14
The projection in face is located at the same side outside the first straight wire and the second straight wire, and the second magneto-resistor 12, third magneto-resistor 13 are respective
It is located at the other side outside the first straight wire and the second straight wire in the projection of 20 place plane of conducting wire.It is straight by first in the application
Conducting wire and the second straight wire are treated as a whole, and " inside of the first straight wire and the second straight wire " refers to two straight wires
Between, " outside " and " inside " of the first straight wire and the second straight wire is opposite.First magneto-resistor 11 and the second magneto-resistor 12 string
Connection, the both ends after series connection connect power supply, third magneto-resistor 13 and the series connection of the 4th magneto-resistor 14, and the both ends after series connection connect power supply,
And the first magneto-resistor 11 and third magneto-resistor 13 are connected to the same end of power supply.Two magneto-resistors in same series arm are each
The projection of comfortable 20 place plane of conducting wire is located at the outside of the first straight wire and the second straight wire, for example, the first magneto-resistor
11 and the second magneto-resistor 12 20 place plane of each comfortable conducting wire projection be located at the first straight wire and the second straight wire outside
Side, the projection of third magneto-resistor 13 and the 4th magneto-resistor 14 20 place plane of each comfortable conducting wire be located at the first straight wire and
The outside of second straight wire.The magnetic susceptibility of first magneto-resistor 11, the second magneto-resistor 12, third magneto-resistor 13, the 4th magneto-resistor 14
Direction is identical, and parallel with pcb board body 30 and vertical with line of symmetry.
The first input end of signal processing module is connected between the first magneto-resistor 11 and the second magneto-resistor 12, the second input
End is connected between third magneto-resistor 13 and the 4th magneto-resistor 14；Signal processing module is used for according to the first magneto-resistor 11 and second
Electric signal, third magneto-resistor 13 between magneto-resistor 12 and the electric signal between the 4th magneto-resistor 14 obtain current value to be measured.
As shown in figure 8, the first branch where the first magneto-resistor 11 and the second magneto-resistor 12 can individually be regarded as shown in Fig. 4
Circuit, the second branch where third magneto-resistor 13 and the 4th magneto-resistor 14 can also individually regard circuit shown in Fig. 4 as.By
It is identical with the magnetic direction at 14 position of the 4th magneto-resistor in the first magneto-resistor 11, the second magneto-resistor 12 and third magneto-resistor 13
The magnetic direction for setting place is identical, and the magnetic direction at 12 position of the first magneto-resistor 11 and the second magneto-resistor is on the contrary, and four
The magnetic susceptibility direction of magneto-resistor is identical, therefore, when not passing to electric current in conducting wire, V- in Fig. 8 (i.e. the first magneto-resistor 11 with
Voltage between second magneto-resistor 12) and V+ (voltage i.e. between third magneto-resistor 13 and the 4th magneto-resistor 14) numerical value phase
Together, the difference between the two 0；When passing to electric current in conducting wire, V- and V+ in Fig. 8 are respectively facing opposite direction change (i.e. one
Increase, another one reduces), the difference between the two is twice of wherein any one variable quantity.It can be seen that the present embodiment and embodiment
One compares, and provided current detection means can further increase output valve, improves detection accuracy.
Similar embodiment one, signal processing module is either operational amplifier and its peripheral circuit, such as Fig. 8 and Fig. 9 institute
Show (the identical position of symbol is electrical connection in two figures)；Alternatively, be also possible to include processor chips module, Huo Zheye
It can be other electronic circuits, the application is without limitation.
As embodiment one or a kind of optional embodiment of embodiment two, privates portion be rectangle with opening or
Round rectangle, and the long side of rectangle is vertical with line of symmetry, as shown in left side rectangular broken line frame in Fig. 3 A or Fig. 7 A.
As embodiment one or a kind of optional embodiment of embodiment two, privates portion is vertical with line of symmetry straight
Conducting wire, as shown in left side rectangular broken line frame in Fig. 3 B or Fig. 7 B；Also, the first magneto-resistor 11 and the second magneto-resistor 12 are located at
The same side of the middle line of first straight wire or the second straight wire.In the embodiment, the first straight wire and the second straight wire are longer,
Depending on specific length needs according to the actual situation.
As embodiment one or a kind of optional embodiment of embodiment two, conducting wire 20 further includes the 4th straight wire, the 5th
Straight wire, it is vertical with line of symmetry, and be respectively connected to the end of the first straight wire, the second straight wire, as Fig. 3 A, Fig. 3 B,
Shown in Fig. 7 A, Fig. 7 B.
As embodiment one or a kind of optional embodiment of embodiment two, being somebody's turn to do the current detection means based on PCB includes
At least three detection units, each detection unit include each magneto-resistor and conducting wire described in embodiment one or embodiment two,
To which multiple detection units be arranged on a pcb board, each detection unit can be used for detecting electric current to be detected all the way.It is special
Ground, at least three conducting wires may be respectively used for passing to three-phase current.Such as in Figure 10, the bar-shaped zone of filling indicates conducting wire,
Three conducting wires are respectively used to pass to A, B, C three-phase current, and two small cubes near every conducting wire respectively indicate two magnetoelectricities
Resistance, 30 indicate pcb board body.
Further include as embodiment one or a kind of optional embodiment of embodiment two, the current detection means based on PCB
Metal cap is set to the second surface of pcb board, and each magneto-resistor and/or signal processing module are located in metal cap.Metal
Cover can shield the interference of external electrical field, effectively eliminate electric current to be measured itself (i.e. interference of the dv/dt to magneto-resistor) and space
Interference of the stray electric field for each component of magneto-resistor or signal processing module.
Optionally, the magneto-resistor in each embodiment of the application can use sensitivity and the higher tunnel the TMR magnetoelectricity of precision
Resistance or other similar magneto-resistors, the application do not limit this.
Although being described in conjunction with the accompanying the embodiment of the present invention, those skilled in the art can not depart from the present invention
Spirit and scope in the case where various modifications and variations can be made, such modifications and variations are each fallen within by appended claims institute
Within the scope of restriction.
Claims (9)
1. a kind of current detection means based on PCB characterized by comprising
Pcb board body；
Conducting wire is printed on the first surface of the pcb board body, for passing to electric current to be measured；The conducting wire includes being parallel to each other
First straight wire and the second straight wire, and its privates portion is connected from side, the privates portion is about line of symmetry
Symmetrically, the line of symmetry is parallel with the first straight wire, the second straight wire, and the spacing base with the first straight wire, the second straight wire
This is equal；
First magneto-resistor, the second magneto-resistor are set to the second surface of the pcb board body, the second surface and described first
Surface is opposite；The projection of plane is located at institute where first magneto-resistor, each leisure of second magneto-resistor conducting wire
State the outside of the first straight wire and second straight wire；The magnetic susceptibility direction of first magneto-resistor and second magneto-resistor
It is identical and parallel with the pcb board body and vertical with the line of symmetry；First magneto-resistor and second magneto-resistor
Series connection, the both ends after series connection connect power supply；
Signal processing module, input terminal are connected between first magneto-resistor and second magneto-resistor, for according to institute
It states the electric signal between the first magneto-resistor and second magneto-resistor and obtains output current value to be measured.
2. a kind of current detection means based on PCB characterized by comprising
Pcb board body；
Conducting wire is printed on the first surface of the pcb board body, for passing to electric current to be measured；The conducting wire includes being parallel to each other
First straight wire and the second straight wire, and its privates portion is connected from side, the privates portion is about line of symmetry
Symmetrically, the line of symmetry is parallel with the first straight wire, the second straight wire, and the spacing base with the first straight wire, the second straight wire
This is equal；
First magneto-resistor, the second magneto-resistor, third magneto-resistor, the 4th magneto-resistor are set to the second surface of the pcb board body,
The second surface is opposite with the first surface；Also, it is led described in each leisure of first magneto-resistor, the 4th magneto-resistor
The projection of plane where line is located at the same side outside first straight wire and second straight wire, second magnetoelectricity
The projection of plane is located at first straight wire and described second and directly leads where resistance, each leisure of third magneto-resistor conducting wire
The other side outside line；First magneto-resistor and second magneto-resistor series connection, both ends after series connection connect power supply, and described the
Three magneto-resistors and the 4th magneto-resistor series connection, the both ends after series connection connect the power supply, and first magneto-resistor and institute
State the same end that third magneto-resistor is connected to the power supply；Each leisure of two magneto-resistors conducting wire institute in same series arm
The outside of first straight wire and second straight wire is located in the projection of plane；It is first magneto-resistor, described
Second magneto-resistor, the third magneto-resistor, the magnetic susceptibility direction of the 4th magneto-resistor are identical, and flat with the pcb board body
Row, and it is vertical with the line of symmetry；
Signal processing module, first input end are connected between first magneto-resistor and second magneto-resistor, and second is defeated
Enter end to be connected between the third magneto-resistor and the 4th magneto-resistor；The signal processing module is used for according to described first
Electric signal, the third magneto-resistor between magneto-resistor and second magneto-resistor and the electric signal between the 4th magneto-resistor
Obtain current value to be measured.
3. the current detection means according to claim 1 or 2 based on PCB, which is characterized in that the privates portion is
Rectangle or round rectangle with opening, and the long side of rectangle is vertical with the line of symmetry.
4. the current detection means according to claim 1 or 2 based on PCB, which is characterized in that the privates portion is
The straight wire vertical with the line of symmetry；Also, first magneto-resistor and second magneto-resistor are located at described first and directly lead
The same side of line or the middle line of second straight wire.
5. the current detection means according to claim 1 or 2 based on PCB, which is characterized in that the conducting wire further include:
4th straight wire, the 5th straight wire, it is vertical with the line of symmetry, and it is respectively connected to the first straight wire, second directly
The end of conducting wire.
6. the current detection means according to claim 1 or 2 based on PCB, which is characterized in that the signal processing module
For operational amplifier.
7. the current detection means according to claim 1 or 2 based on PCB, which is characterized in that including at least three detections
Unit, the detection unit include each magneto-resistor and the conducting wire.
8. the current detection means according to claim 7 based on PCB, which is characterized in that at least three conducting wires point
Three-phase current Yong Yu not passed to.
9. the current detection means according to claim 1 or 2 based on PCB, which is characterized in that it further include metal cap, if
It is placed in the second surface of the pcb board, and each magneto-resistor and/or the signal processing module are located in the metal cap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910190635.5A CN109946499A (en) | 2019-03-13 | 2019-03-13 | Current detection means based on PCB |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910190635.5A CN109946499A (en) | 2019-03-13 | 2019-03-13 | Current detection means based on PCB |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109946499A true CN109946499A (en) | 2019-06-28 |
Family
ID=67009641
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910190635.5A Pending CN109946499A (en) | 2019-03-13 | 2019-03-13 | Current detection means based on PCB |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109946499A (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060071655A1 (en) * | 2004-10-01 | 2006-04-06 | Tdk Corporation | Current sensor |
| US20070090825A1 (en) * | 2005-09-30 | 2007-04-26 | Tdk Corporation | Current sensor |
| CN102419393A (en) * | 2011-12-30 | 2012-04-18 | 江苏多维科技有限公司 | Current sensor |
| CN103487632A (en) * | 2013-10-11 | 2014-01-01 | 上海飞轩电子有限公司 | Shielded open loop type magnetic gathering ring-free tunneling magnetoresistive sensor |
| CN105044439A (en) * | 2015-08-26 | 2015-11-11 | 江苏多维科技有限公司 | Tunnel magnetoresistance current sensor |
| CN205941659U (en) * | 2016-07-28 | 2017-02-08 | 无锡乐尔科技有限公司 | Current sensor |
| CN108303660A (en) * | 2018-03-13 | 2018-07-20 | 海宁嘉晨汽车电子技术有限公司 | A kind of plug-type vertical sensitive Magnetic Sensor |
| CN208207050U (en) * | 2018-06-05 | 2018-12-07 | 南方电网科学研究院有限责任公司 | A kind of measuring device of line current |
| CN109374941A (en) * | 2018-11-30 | 2019-02-22 | 无锡乐尔科技有限公司 | The current measuring method and device of copper bar type conducting wire |
| CN209927922U (en) * | 2019-03-13 | 2020-01-10 | 无锡乐尔科技有限公司 | Current detection device based on PCB |
-
2019
- 2019-03-13 CN CN201910190635.5A patent/CN109946499A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060071655A1 (en) * | 2004-10-01 | 2006-04-06 | Tdk Corporation | Current sensor |
| US20070090825A1 (en) * | 2005-09-30 | 2007-04-26 | Tdk Corporation | Current sensor |
| CN102419393A (en) * | 2011-12-30 | 2012-04-18 | 江苏多维科技有限公司 | Current sensor |
| CN103487632A (en) * | 2013-10-11 | 2014-01-01 | 上海飞轩电子有限公司 | Shielded open loop type magnetic gathering ring-free tunneling magnetoresistive sensor |
| CN105044439A (en) * | 2015-08-26 | 2015-11-11 | 江苏多维科技有限公司 | Tunnel magnetoresistance current sensor |
| CN205941659U (en) * | 2016-07-28 | 2017-02-08 | 无锡乐尔科技有限公司 | Current sensor |
| CN108303660A (en) * | 2018-03-13 | 2018-07-20 | 海宁嘉晨汽车电子技术有限公司 | A kind of plug-type vertical sensitive Magnetic Sensor |
| CN208207050U (en) * | 2018-06-05 | 2018-12-07 | 南方电网科学研究院有限责任公司 | A kind of measuring device of line current |
| CN109374941A (en) * | 2018-11-30 | 2019-02-22 | 无锡乐尔科技有限公司 | The current measuring method and device of copper bar type conducting wire |
| CN209927922U (en) * | 2019-03-13 | 2020-01-10 | 无锡乐尔科技有限公司 | Current detection device based on PCB |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109752586A (en) | Current detection means based on PCB | |
| CN103901363B (en) | A kind of single-chip z axis magnetic resistance sensor | |
| CN102016606B (en) | Arrangements for current sensing circuit and integrated current sensor | |
| US9372240B2 (en) | Current sensor | |
| US9176203B2 (en) | Apparatus and method for in situ current measurement in a conductor | |
| JP6467696B2 (en) | Current measuring device | |
| US9176170B2 (en) | Current sensor | |
| EP3376244B1 (en) | Magnetic sensor | |
| US9739850B2 (en) | Push-pull flipped-die half-bridge magnetoresistive switch | |
| CN108169534A (en) | Current sensor | |
| US11016124B2 (en) | Integrated current sensor | |
| CN105486907B (en) | Current sensor | |
| CN113985100A (en) | Improved current sensing device with integrated electrical shielding | |
| US20130127454A1 (en) | Magnetic field sensor including an anisotropic magnetoresistive magnetic sensor and a hall magnetic sensor | |
| CN209927922U (en) | Current detection device based on PCB | |
| CN109946499A (en) | Current detection means based on PCB | |
| CN209927923U (en) | Current detection device based on PCB | |
| US20220381805A1 (en) | Differential signal current sensor | |
| CN209446649U (en) | The current measuring device of copper bar type conducting wire | |
| CN110426658A (en) | A kind of vertical sensitive Magnetic Sensor of the wide-range fed back on closed loop core | |
| CN109374941A (en) | The current measuring method and device of copper bar type conducting wire | |
| US11249145B2 (en) | Magnetic field sensing | |
| CN114371325A (en) | Current sensing chip | |
| CN113376421A (en) | Current sensor with S-shaped conductor | |
| CN212207492U (en) | Current sensor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20210903 Address after: 315221 No. 1, Jinxi Road, Jiaochuan street, Zhenhai District, Ningbo City, Zhejiang Province Applicant after: NING BO SINOMAGS ELECTRONIC TECHNOLOGY Co.,Ltd. Address before: 214131 999-8-a2-501, gaolang East Road, Wuxi City, Jiangsu Province Applicant before: WUXI LER TECHNOLOGY Co.,Ltd. |