CN109149792A - Foreign substance detection system and its method for detecting metallic foreign body - Google Patents
Foreign substance detection system and its method for detecting metallic foreign body Download PDFInfo
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- CN109149792A CN109149792A CN201710512132.6A CN201710512132A CN109149792A CN 109149792 A CN109149792 A CN 109149792A CN 201710512132 A CN201710512132 A CN 201710512132A CN 109149792 A CN109149792 A CN 109149792A
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- 238000001514 detection method Methods 0.000 title claims abstract description 258
- 238000000034 method Methods 0.000 title claims abstract description 28
- 239000000126 substance Substances 0.000 title claims abstract description 22
- 238000012545 processing Methods 0.000 claims abstract description 9
- 238000007689 inspection Methods 0.000 claims description 9
- 238000012360 testing method Methods 0.000 claims description 6
- 238000001574 biopsy Methods 0.000 claims 1
- 230000003993 interaction Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 22
- 239000002184 metal Substances 0.000 description 10
- 229910052751 metal Inorganic materials 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- 230000005611 electricity Effects 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 235000013399 edible fruits Nutrition 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 238000012800 visualization Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
A kind of method that the present invention provides foreign substance detection system and its detects metallic foreign body.The system includes: trigger circuit, DC/AC circuit, processing module, mobile device, detection line girth sheets and detection coil；Mobile device is for moving detection line girth sheets；Detection coil and DC/AC circuit connection, for generating the magnetic field of detection metallic foreign body according to the alternating current from DC/AC circuit to detect metallic foreign body；Trigger circuit is connect with detection coil, for obtaining the impedance of detection coil, generates square-wave signal according to impedance；DC/AC circuit is also connect with trigger circuit, is used for according to square-wave signal, output frequency and duty ratio alternating current identical with square-wave signal, and export alternating current to detection coil；Processing module connects trigger circuit and judges whether there is metallic foreign body according to comparison result for making comparisons the frequency of square-wave signal with preset frequency.The detection accuracy of metallic foreign body can be improved in the present invention, eliminates foreign bodies detection blind area.
Description
Technical field
The present invention relates to metal detection fields, and in particular, to a kind of foreign substance detection system and its detection metal are different
The method of object.
Background technique
With the development of wireless charging technology and electric car, electric car wireless charging technology has also obtained broad development
And application.Meanwhile the metallic foreign body detection technique in electric car wireless charging has also obtained the extensive of industry and academia
Concern.However, for the technology of the minute metallic foreign bodies detection in wireless charging system for electric automobile, still none is reliable
Technology go to realize, in detection process there are still blind area detection puzzlement.
Traditional wireless charging foreign material detecting technique is concentrated mainly in small-power (5W~10W) application, according to wireless charging
The standard for the QI that Electricity Federation alliance WPC (Wireless Power Consortium) is formulated designs.For electric car wireless charging
Foreign bodies detection part, be concentrated mainly on heat detection and power detection；Or it is directly examined using visualization technique or Radar Technology
Survey foreign matter；Or the foreign matter between detection coil and receiving coil is appeared in using additional detection coil detection.Wherein, 1. pairs
In the foreign material detecting technique of low-power applications, area coil and coil distance very little, main technology are that detection issues side function
The difference of rate and receiving side power, to judge whether there is foreign matter by difference variation.2. for electric car wireless charging
Foreign material detecting technique has some scholars to detect whether foreign matter by detection efficiency of transmission variation；Also some scholars pass through inspection
The variation of test coil surface temperature judges whether there is foreign matter.3. have is by equipment direct detection foreign matters such as visualization or radars
No existing scheme.Detection magnetic field is established using special detection coil and driving source 4. also having, passes through measurement detection coil electricity
Size variation is flowed to determine whether there are the schemes of foreign matter.5. the overlapping detection coil that Fig. 1 has check frequency in the prior art
Schematic diagram.As shown in Figure 1, can realize the blind area in Coil Detector method using one or more layers overlapping detection coil is increased
Detection.
Minute metallic foreign bodies detection still cannot be preferably solved the problems, such as by the above-mentioned prior art, and reason is: 1. pairs
In the foreign material detecting technique of low-power applications, due to all differing greatly with powerful volume and transmission range, so small-power
If foreign material detecting technique use in high-power, since small metal is to the loss very little of power, relatively small metal
Foreign matter is difficult to detected.2. the scheme of metallic foreign body is detected for the mode of detection efficiency of transmission variation, if metal is different
Volume of object itself is smaller (coin-size), is difficult to detect.For detection coil surface temperature variation judgement be
The no scheme for having metallic foreign body, an obvious shortcoming are that detection time is relatively long (minute rank).Another defect is
Since high temperature itself is relative ambient temperature, if summer environment temperature itself is very high, this detection mode just has security risk.
3. the former needs to introduce light condition and identification technology appropriate and will receive weather for visualization or radar detection scheme
The certain restrictions of condition, the latter then need to overcome using multipath radar comprehensive scanning the detection technique blind area of radar and be easy by
To interference, the two cost is all higher.4. for the scheme of detection coil size of current variation, the program is easy to be disturbed, and
Cause program detection accuracy not high since metallic foreign body to be checked can only often cause lesser curent change, causes to detect micro-
The effect of small metallic foreign body is unobvious.5. being realized in Coil Detector method for increasing one or more layers overlapping detection coil
The scheme of blind area detection, the detection coil quantity that the program needs is more, and loss is larger, and because of pcb board manufacture craft reason,
Pcb board side still suffers from blind area residual.
Summary of the invention
A kind of method that the embodiment of the present invention provides foreign substance detection system and its detects metallic foreign body, to improve gold
Belong to the detection accuracy of foreign matter, shorten detection time, avoid security risk in a high temperauture environment, there is better anti-interference spy
Property, foreign bodies detection blind area is eliminated, testing cost is reduced.
To achieve the goals above, the embodiment of the present invention provides a kind of foreign substance detection system, comprising: trigger circuit,
It DC/AC circuit, processing module, mobile device, the detection line girth sheets being installed in mobile device and is installed on detection line girth sheets
Detection coil；
Mobile device is for moving detection line girth sheets to eliminate check frequency；
Detection coil and DC/AC circuit connection, it is different for generating detection metal according to the alternating current from DC/AC circuit
The magnetic field of object is to detect metallic foreign body, wherein detection coil is detecting metallic foreign body by mobile forward and backward generate of mobile device
To detect metallic foreign body, magnetic field, which also interacts with metallic foreign body, changes the impedance of detection coil in magnetic field；
Trigger circuit is connect with detection coil, is produced for obtaining the impedance of detection coil, and according to the impedance of detection coil
Raw square-wave signal；
DC/AC circuit is also connect with trigger circuit, for according to square-wave signal, output frequency and duty ratio and square-wave signal
Identical alternating current, and alternating current is exported to detection coil；
Processing module connects trigger circuit, for the frequency of square-wave signal to be made comparisons with preset frequency, ties according to comparing
Fruit judges whether there is metallic foreign body.
In a kind of wherein embodiment, mobile device includes:
Bottom plate, bottom plate are equipped with guide rail；
Support rod is used to support detection line girth sheets；
Motor is used to provide power；
Connecting rod, one end are connect with detection line girth sheets, the driving axis connection of the other end and motor, and under the drive of the motor,
Detection line girth sheets is driven to move in guide rail.
In a kind of wherein embodiment, mobile device includes:
Shell, including bottom plate and side wall；
Bottom plate, bottom plate are equipped with guide rail；
Support rod is used to support detection line girth sheets；
First armature；
First electromagnet, connect with the first power supply and the first armature residual gap is every a pre-determined distance, is used to provide power；
First connecting rod, one end are connect with one end of detection line girth sheets, and the other end is equipped with the first armature；
Spring, one end are fixed on side wall；
Second connecting rod, one end are connect with the other end of detection line girth sheets, the other end connection of the other end and spring；
In the first power supply power supply, first the first armature of electromagnetic actuation, spring-compressed, first connecting rod and second connecting rod band
Dynamic detection line girth sheets is mobile to spring-compressed direction in guide rail；
In the first power cut-off, the first electromagnet flicks the first armature, recoil of spring, first connecting rod and second connecting rod band
Dynamic detection line girth sheets is mobile to recoil of spring direction in guide rail.
In a kind of wherein embodiment, mobile device includes:
Bottom plate, bottom plate are equipped with guide rail；
Support rod is used to support detection line girth sheets；
First armature；
Second armature；
First electromagnet, connect with the first power supply and the first armature residual gap is every a pre-determined distance, is used to provide power；
Second electromagnet, connect with second source and the second armature residual gap is every a pre-determined distance, is used to provide power；
First connecting rod, one end are connect with one end of detection line girth sheets, and the other end is equipped with the first armature；
Second connecting rod, one end are connect with the other end of detection line girth sheets, and the other end is equipped with the second armature；
First power supply provides opposite electric current with second source simultaneously；
When first the first armature of electromagnetic actuation, the second electromagnet flicks the second armature, first connecting rod and second connecting rod
Drive detection line girth sheets mobile to the second electromagnet direction in guide rail；
When second the second armature of electromagnetic actuation, the first electromagnet flicks the first armature, first connecting rod and second connecting rod
Drive detection line girth sheets mobile to the first electromagnet direction in guide rail.
In a kind of wherein embodiment, the moving distance of detection line girth sheets is greater than check frequency.
In a kind of wherein embodiment, detection coil includes multiple concatenated first coils；
The moving distance of detection line girth sheets is less than the catercorner length of any one first coil.
The embodiment of the present invention also provides a kind of method of the detection metallic foreign body of foreign substance detection system as described above,
Include:
Execute following circular treatment:
Detection coil impedance is obtained, and square-wave signal is generated according to the impedance of detection coil；
According to square-wave signal, output frequency and duty ratio alternating current identical with square-wave signal, and export alternating current
To detection coil；
The magnetic field of detection metallic foreign body is generated according to alternating current；
Detection generates the impedance of the detection coil behind magnetic field, and according to the impedance generation side of the detection coil behind generation magnetic field
Wave signal；
The frequency of square-wave signal is made comparisons with preset frequency, metallic foreign body is judged whether there is according to comparison result；
Mobile detection line girth sheets.
In a kind of wherein embodiment, mobile detection line girth sheets includes:
Connecting rod under the drive of the motor, drives detection line girth sheets to move in guide rail.
In a kind of wherein embodiment, mobile detection line girth sheets includes:
In the first power supply power supply, first the first armature of electromagnetic actuation, spring-compressed, first connecting rod and second connecting rod band
Dynamic detection line girth sheets is mobile to spring-compressed direction in guide rail；
In the first power cut-off, the first electromagnet flicks the first armature, recoil of spring, first connecting rod and second connecting rod band
Dynamic detection line girth sheets is mobile to recoil of spring direction in guide rail.
In a kind of wherein embodiment, mobile detection line girth sheets includes:
First power supply provides opposite electric current with second source simultaneously；
When first the first armature of electromagnetic actuation, the second electromagnet flicks the second armature, first connecting rod and second connecting rod
Drive detection line girth sheets mobile to the second electromagnet direction in guide rail；
When second the second armature of electromagnetic actuation, the first electromagnet flicks the first armature, first connecting rod and second connecting rod
Drive detection line girth sheets mobile to the first electromagnet direction in guide rail.
The foreign substance detection system of the embodiment of the present invention and its method for detecting metallic foreign body first obtain detection coil and become
The impedance of change generates square-wave signal according to the impedance, then the frequency of the square-wave signal is made comparisons with preset frequency, according to
Comparison result judges whether there is metallic foreign body, and compared with prior art, the detection accuracy of metallic foreign body can be improved in the present invention,
Shorten detection time, avoid security risk in a high temperauture environment, there is better noiseproof feature；The present invention can also pass through
Mobile device moves detection line girth sheets, to eliminate foreign bodies detection blind area, reduces testing cost.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, embodiment will be described below
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only of the invention some
Embodiment for those of ordinary skill in the art without creative efforts, can also be attached according to these
Figure obtains other attached drawings.
Fig. 1 is the schematic diagram of the overlapping detection coil with check frequency in the prior art；；
Fig. 2 is the schematic diagram of detection line girth sheets in the embodiment of the present invention；
Fig. 3 is the structural block diagram of foreign substance detection system in the embodiment of the present invention；
Fig. 4 is the structural schematic diagram of the first embodiment of mobile device in the embodiment of the present invention；
Fig. 5 is the structural schematic diagram of second of embodiment of mobile device in the embodiment of the present invention；
Fig. 6 is the structural schematic diagram of the third embodiment of mobile device in the embodiment of the present invention；
Fig. 7 is the mobile effect diagram of detection line girth sheets in the embodiment of the present invention；
Fig. 8 is detection coil schematic diagram when alternating current flows through no metallic foreign body in the embodiment of the present invention；
Fig. 9 is the equivalent circuit diagram for the detection coil that alternating current flows through no metallic foreign body in the embodiment of the present invention；
Figure 10 is that alternating current flows through the detection coil schematic diagram for having metallic foreign body in the embodiment of the present invention；
Figure 11 is that alternating current flows through the equivalent circuit diagram for having the detection coil of metallic foreign body in the embodiment of the present invention；
Figure 12 is the flow chart that the method for metallic foreign body is detected in the embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Minute metallic foreign bodies detection, this hair still cannot be preferably solved the problems, such as in view of current metallic foreign body detection technique
A kind of method that bright embodiment provides foreign substance detection system and its detects metallic foreign body first obtains the resistance of detection coil variation
Resist, square-wave signal is generated according to the impedance, then the frequency of the square-wave signal is made comparisons with preset frequency, is tied according to comparing
Fruit judges whether there is metallic foreign body, and compared with prior art, the detection accuracy of metallic foreign body can be improved in the present invention, shortens inspection
The time is surveyed, security risk in a high temperauture environment is avoided, there is better noiseproof feature；The present invention can also be filled by mobile
Mobile detection line girth sheets is set, to eliminate foreign bodies detection blind area, reduces testing cost.
Below in conjunction with attached drawing, the present invention is described in detail.
Fig. 3 is the structural block diagram of foreign substance detection system in the embodiment of the present invention.As shown in figure 3, metallic foreign body detects
System includes: trigger circuit, DC/AC circuit, processing module, inspection mobile device (not showing in Fig. 3), be installed in mobile device
Detection coil survey line girth sheets (not showing in Fig. 3) and be installed on detection line girth sheets；Mobile device is for moving detection line girth sheets
To eliminate check frequency；Detection coil and DC/AC circuit connection, for generating inspection according to the alternating current from DC/AC circuit
The magnetic field of metallic foreign body is surveyed to detect metallic foreign body；Wherein, detection coil is detecting gold by mobile forward and backward generate of mobile device
Belong to the magnetic field of foreign matter to detect metallic foreign body, magnetic field, which also interacts with metallic foreign body, changes the impedance of detection coil；Triggering electricity
Road is connect with detection coil, generates square-wave signal for obtaining the impedance of detection coil, and according to the impedance of detection coil；DC/
AC circuit is also connect with trigger circuit, for exchanging according to square-wave signal, output frequency and duty ratio are identical with square-wave signal
Electric current, and alternating current is exported to detection coil；Processing module connects trigger circuit, for by the frequency of square-wave signal and predetermined
Frequency is made comparisons, and judges whether there is metallic foreign body according to comparison result.
Fig. 4 is the structural schematic diagram of the first embodiment of mobile device in the embodiment of the present invention.As shown in figure 4, mobile dress
Setting may include: bottom plate, and bottom plate is equipped with guide rail；Support rod is mounted on detection coil board bottom face, is used to support detection coil
Plate；Motor is used to provide power；Connecting rod, one end are connect with detection line girth sheets, the driving axis connection of the other end and motor, and
Under the driving of motor, detection line girth sheets is driven to move in guide rail.
The components such as bottom plate, guide rail, support rod and connecting rod can use plastic material, and motor can be placed in detection
The drive shaft of rotation is converted to the linear motion of connecting rod using worm screw transmission mode by the lower space of coil plate.When connecting rod exists
When driving detection line girth sheets to move in guide rail under the driving of motor, when motor drives detection line girth sheets to move along guide rail, metal
Foreign matter detection system will not detect metallic foreign body, until detection line girth sheets is moved to predeterminated position.Motor in Fig. 4 is installed on inspection
On the diagonal line of survey line girth sheets, detection line girth sheets is enabled diagonally to move back and forth in guide rail.In other realities of the invention
Apply in example, motor is also mountable on the side of detection line girth sheets, enable detection line girth sheets in guide rail along the vertical direction, right and left
To or other any directions move back and forth.Mobile device of the invention can enable metallic foreign body by mobile detection line girth sheets
Different location in detection line girth sheets, to eliminate the check frequency of metallic foreign body.
Fig. 5 is the structural schematic diagram of second of embodiment of mobile device in the embodiment of the present invention.As shown in figure 5, mobile dress
Setting may include: shell, including bottom plate and side wall；Bottom plate, bottom plate are equipped with guide rail；Support rod is used to support detection line girth sheets；
First armature；First electromagnet connect with the first power supply (not showing in Fig. 5) and the first armature residual gap is every a pre-determined distance, for mentioning
For power；First connecting rod, one end are connect with one end of detection line girth sheets, and the other end is equipped with the first armature；Spring, one end are fixed
On side wall；Second connecting rod, one end are connect with the other end of detection line girth sheets, the other end connection of the other end and spring；?
When one power supply power supply, first the first armature of electromagnetic actuation, spring-compressed, first connecting rod and second connecting rod drive detection line girth sheets
It is mobile to spring-compressed direction in guide rail；In the first power cut-off, the first electromagnet flicks the first armature, recoil of spring,
First connecting rod and second connecting rod drive detection line girth sheets mobile to recoil of spring direction in guide rail.
The components such as shell, guide rail, support rod, first connecting rod and second connecting rod can use plastic material, the first electricity
Magnet and the first power supply can be placed in the lower space of detection line girth sheets, and when the first electromagnet is powered, the first electromagnet is inhaled
The first armature, spring-compressed are closed, first connecting rod and second connecting rod drive detection line girth sheets to move in guide rail to spring-compressed direction
It is dynamic；When the power-off of the first electromagnet, the first electromagnet flicks the first armature, recoil of spring, and first connecting rod and second connecting rod drive
Detection line girth sheets is mobile to recoil of spring direction in guide rail.Electromagnet and spring in Fig. 5 are respectively arranged in detection line girth sheets
It is diagonal on, enable detection line girth sheets diagonally move back and forth.In other embodiments of the invention, electromagnet and spring
Can also be respectively arranged on the opposite side of detection line girth sheets, enable detection line girth sheets in guide rail along the vertical direction, left and right directions or
Other any directions move back and forth.
Fig. 6 is the structural schematic diagram of the third embodiment of mobile device in the embodiment of the present invention.As shown in fig. 6, mobile dress
Setting can also include: bottom plate, and bottom plate is equipped with guide rail；Support rod is used to support detection line girth sheets；First armature；Second armature；
First electromagnet, connect with the first power supply and the first armature residual gap is every a pre-determined distance, is used to provide power；Second electromagnet, with
Second source connection and the second armature residual gap are used to provide power every a pre-determined distance；First connecting rod, one end and detection line girth sheets
One end connection, the other end is equipped with the first armature；Second connecting rod, one end are connect with the other end of detection line girth sheets, the other end
Second armature is installed；First power supply provides opposite electric current with second source simultaneously；When first the first armature of electromagnetic actuation
When, the second electromagnet flicks the second armature, and first connecting rod and second connecting rod drive detection line girth sheets in guide rail to the second electromagnetism
Iron direction is mobile；When second the second armature of electromagnetic actuation, the first electromagnet flicks the first armature, and first connecting rod and second connect
Bar drives detection line girth sheets mobile to the first electromagnet direction in guide rail.When it is implemented, foreign substance detection system can be with
A metallic foreign body is detected every a preset time, the actuation of electromagnet can also be changed by adjusting the supply current of power supply
Ability, so that detection line girth sheets be enabled to be in different positions.
Fig. 2 is the schematic diagram of detection line girth sheets in the embodiment of the present invention.As shown in Fig. 2, being installed on the inspection of detection line girth sheets
Test coil includes multiple concatenated first coils.Wherein, the moving distance of detection line girth sheets is less than any one first coil
Catercorner length.Fig. 7 is the mobile effect diagram of detection line girth sheets in the embodiment of the present invention.As shown in fig. 7, detection line girth sheets
Can along the vertical direction, left and right directions or other any directions move back and forth, the movable distance of detection line girth sheets is greater than inspection
Blind area is surveyed, detection range can cover the check frequency of all metallic foreign bodies.
Fig. 8 is detection coil schematic diagram when alternating current flows through no metallic foreign body in the embodiment of the present invention.Such as Fig. 8 institute
Show, works as alternating currentWhen flowing through the detection coil of no metallic foreign body, the first magnetic field can be generatedFig. 9 is the embodiment of the present invention
Middle alternating current flows through the equivalent circuit diagram of the detection coil of no metallic foreign body.As shown in figure 9, alternating voltageTo first resistor
R1With the first equivalent inductance L1Power supply generates alternating currentWhen metallic foreign body is not present, the equivalent output resistance of the first of coil
It is anti-to be: Z0=R1+jωL1, wherein Z0For the first equivalent output impedance of coil, R1For the first equivalent resistance of coil, ω is to hand over
The electrical angle of galvanic electricity.
Figure 10 is that alternating current flows through the detection coil schematic diagram for having metallic foreign body in the embodiment of the present invention.Such as Figure 10 institute
Show, works as alternating currentWhen flowing through the detection coil for having metallic foreign body, it can be generated due to eddy current effect, in metallic foreign body and first
Magnetic fieldReversed induced magnetic fieldAnd and alternating currentReversed induced currentFigure 11 is the embodiment of the present invention
Middle alternating current flows through the equivalent circuit diagram for having the detection coil of metallic foreign body.As shown in figure 11, when there are metallic foreign body, line
Second equivalent output impedance of circle is:Wherein, Z1For line
First equivalent output impedance of circle, R2For the second equivalent resistance, mutual inductance of the M between coil and metallic foreign body, L2It is second
Equivalent inductance.The expression formula for comparing the first equivalent output impedance and the second equivalent output impedance can be seen that when detection coil
When having metallic foreign body in magnetic field range, the equivalent output impedance of detection coil is changed.With changing for equivalent output impedance
Become, the frequency of the square-wave signal of trigger circuit output can also generate variation.Processing module is by the frequency of square-wave signal and makes a reservation for frequency
Rate is made comparisons, if the variation of square-wave signal frequency exceeds the preset range of preset frequency, shows that there are metallic foreign bodies.
Based on the same inventive concept, a kind of detection metal of foreign substance detection system is additionally provided in the embodiment of the present invention
The method of foreign matter, since the principle that this method solves the problems, such as is similar to foreign substance detection system, the implementation of this method can
With referring to the implementation of system, overlaps will not be repeated.
Figure 12 is the flow chart that the method for metallic foreign body is detected in the embodiment of the present invention.As shown in figure 12, detection metal is different
The method of object may include:
Step 101: obtaining detection coil impedance, and square-wave signal is generated according to the impedance of detection coil.
Step 102: according to square-wave signal, output frequency and duty ratio alternating current identical with square-wave signal, and export
Alternating current is to detection coil.
Step 103: the magnetic field of detection metallic foreign body is generated according to alternating current.
Step 104: detection generates the impedance of the detection coil behind magnetic field, and according to the resistance of the detection coil behind generation magnetic field
Anti- generation square-wave signal.
Step 105: the frequency of square-wave signal being made comparisons with preset frequency, metal is judged whether there is according to comparison result
Foreign matter.
Step 106: mobile detection line girth sheets.
In embodiment, mobile detection line girth sheets include: connecting rod under the drive of the motor, drive detection line girth sheets in guide rail
It is mobile.
In embodiment, mobile detection line girth sheets includes: first the first armature of electromagnetic actuation in the first power supply power supply,
Spring-compressed, first connecting rod and second connecting rod drive detection line girth sheets mobile to spring-compressed direction in guide rail；
In the first power cut-off, the first electromagnet flicks the first armature, recoil of spring, first connecting rod and second connecting rod band
Dynamic detection line girth sheets is mobile to recoil of spring direction in guide rail.
In embodiment, mobile detection line girth sheets includes: that the first power supply provides opposite electric current with second source simultaneously；
When first the first armature of electromagnetic actuation, the second electromagnet flicks the second armature, first connecting rod and second connecting rod
Drive detection line girth sheets mobile to the second electromagnet direction in guide rail；
When second the second armature of electromagnetic actuation, the first electromagnet flicks the first armature, first connecting rod and second connecting rod
Drive detection line girth sheets mobile to the first electromagnet direction in guide rail.
To sum up, the foreign substance detection system of the embodiment of the present invention and its method for detecting metallic foreign body, first obtain detection
The impedance of coil variation generates square-wave signal according to the impedance, then the frequency of the square-wave signal and preset frequency is made ratio
Compared with, metallic foreign body is judged whether there is according to comparison result, the detection accuracy of metallic foreign body is improved, shortens detection time,
Security risk in a high temperauture environment is avoided, there is better noiseproof feature.The present invention can also be mobile by mobile device
Detection line girth sheets, so that the different location for making metallic foreign body be in detection line girth sheets reduces detection to eliminate foreign bodies detection blind area
Cost.
Particular embodiments described above has carried out further in detail the purpose of the present invention, technical scheme and beneficial effects
Describe in detail it is bright, it should be understood that the above is only a specific embodiment of the present invention, the guarantor being not intended to limit the present invention
Range is protected, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should be included in this
Within the protection scope of invention.
Claims (10)
1. a kind of foreign substance detection system characterized by comprising trigger circuit, DC/AC circuit, processing module, mobile dress
The detection line girth sheets set, being installed in the mobile device and the detection coil being installed on the detection line girth sheets；
The mobile device is for moving the detection line girth sheets to eliminate check frequency；
The detection coil and the DC/AC circuit connection, for generating inspection according to the alternating current from the DC/AC circuit
The magnetic field of metallic foreign body is surveyed to detect metallic foreign body, wherein the detection coil forward and backward is being produced by the mobile device is mobile
Biopsy surveys the magnetic field of metallic foreign body to detect metallic foreign body, and the magnetic field also changes the inspection with metallic foreign body interaction
The impedance of test coil；
The trigger circuit is connect with the detection coil, for obtaining the impedance of the detection coil, and according to the detection
The impedance of coil generates square-wave signal；
The DC/AC circuit is also connect with the trigger circuit, for according to the square-wave signal, output frequency and duty ratio with
The identical alternating current of the square-wave signal, and the alternating current is exported to the detection coil；
The processing module connects the trigger circuit, for the frequency of the square-wave signal to be made comparisons with preset frequency, root
Metallic foreign body is judged whether there is according to comparison result.
2. foreign substance detection system according to claim 1, which is characterized in that the mobile device includes:
Bottom plate, bottom plate are equipped with guide rail；
Support rod is used to support the detection line girth sheets；
Motor is used to provide power；
Connecting rod, one end are connect with the detection line girth sheets, the driving axis connection of the other end and the motor, and in the motor
Under driving, the detection line girth sheets is driven to move in the guide rail.
3. foreign substance detection system according to claim 1, which is characterized in that the mobile device includes:
Shell, including bottom plate and side wall；
Bottom plate, bottom plate are equipped with guide rail；
Support rod is used to support the detection line girth sheets；
First armature；
First electromagnet, connect with the first power supply and first armature residual gap is every a pre-determined distance, is used to provide power；
First connecting rod, one end are connect with one end of the detection line girth sheets, and the other end is equipped with first armature；
Spring, one end are fixed on the side wall；
Second connecting rod, one end are connect with the other end of the detection line girth sheets, and the other end is connect with the other end of the spring；
In first power supply power supply, the first armature described in first electromagnetic actuation, the spring-compressed, described first
Connecting rod and the second connecting rod drive the detection line girth sheets mobile to spring-compressed direction in the guide rail；
In first power cut-off, first electromagnet flicks first armature, the recoil of spring, and described first
Connecting rod and the second connecting rod drive the detection line girth sheets mobile to recoil of spring direction in the guide rail.
4. foreign substance detection system according to claim 1, which is characterized in that the mobile device includes:
Bottom plate, bottom plate are equipped with guide rail；
Support rod is used to support the detection line girth sheets；
First armature；
Second armature；
First electromagnet, connect with the first power supply and first armature residual gap is every a pre-determined distance, is used to provide power；
Second electromagnet, connect with second source and second armature residual gap is every a pre-determined distance, is used to provide power；
First connecting rod, one end are connect with one end of the detection line girth sheets, and the other end is equipped with first armature；
Second connecting rod, one end are connect with the other end of the detection line girth sheets, and the other end is equipped with second armature；
First power supply provides opposite electric current with the second source simultaneously；
When the first armature described in first electromagnetic actuation, second electromagnet flicks second armature, and described
One connecting rod and the second connecting rod drive the detection line girth sheets mobile to the second electromagnet direction in the guide rail；
When the second armature described in second electromagnetic actuation, first electromagnet flicks first armature, and described
One connecting rod and the second connecting rod drive the detection line girth sheets mobile to the first electromagnet direction in the guide rail.
5. according to foreign substance detection system described in any claim in claim 2-4, which is characterized in that
The moving distance of the detection line girth sheets is greater than check frequency.
6. according to foreign substance detection system described in any claim in claim 2-4, which is characterized in that
The detection coil includes multiple concatenated first coils；
The moving distance of the detection line girth sheets is less than the catercorner length of any one first coil.
7. a kind of method of the detection metallic foreign body of foreign substance detection system described in claim 1-6, which is characterized in that packet
It includes:
Execute following circular treatment:
Detection coil impedance is obtained, and square-wave signal is generated according to the impedance of the detection coil；
According to the square-wave signal, output frequency and duty ratio alternating current identical with the square-wave signal, and described in output
Alternating current is to the detection coil；
The magnetic field of detection metallic foreign body is generated according to the alternating current；
Detection generates the impedance of the detection coil behind magnetic field, and generates square wave letter according to the impedance of the detection coil behind generation magnetic field
Number；
The frequency of the square-wave signal is made comparisons with preset frequency, metallic foreign body is judged whether there is according to comparison result；
Mobile detection line girth sheets.
8. the method for detection metallic foreign body according to claim 7, which is characterized in that the mobile detection line girth sheets packet
It includes:
Connecting rod under the drive of the motor, drives the detection line girth sheets to move in guide rail.
9. the method for detection metallic foreign body according to claim 7, which is characterized in that the mobile detection line girth sheets packet
It includes:
In the first power supply power supply, first the first armature of electromagnetic actuation, spring-compressed, first connecting rod and second connecting rod drive institute
It is mobile to spring-compressed direction in guide rail to state detection line girth sheets；
In the first power cut-off, the first electromagnet flicks the first armature, recoil of spring, and first connecting rod and second connecting rod drive institute
It is mobile to recoil of spring direction in guide rail to state detection line girth sheets.
10. the method for detection metallic foreign body according to claim 7, which is characterized in that the mobile detection line girth sheets packet
It includes:
First power supply provides opposite electric current with second source simultaneously；
When first the first armature of electromagnetic actuation, the second electromagnet flicks the second armature, and first connecting rod and second connecting rod drive
The detection line girth sheets is mobile to the second electromagnet direction in guide rail；
When second the second armature of electromagnetic actuation, the first electromagnet flicks the first armature, and first connecting rod and second connecting rod drive
The detection line girth sheets is mobile to the first electromagnet direction in guide rail.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710512132.6A CN109149792A (en) | 2017-06-28 | 2017-06-28 | Foreign substance detection system and its method for detecting metallic foreign body |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710512132.6A CN109149792A (en) | 2017-06-28 | 2017-06-28 | Foreign substance detection system and its method for detecting metallic foreign body |
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| CN109149792A true CN109149792A (en) | 2019-01-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710512132.6A Withdrawn CN109149792A (en) | 2017-06-28 | 2017-06-28 | Foreign substance detection system and its method for detecting metallic foreign body |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109638987A (en) * | 2019-01-10 | 2019-04-16 | 深圳大学 | A kind of wireless charging system detection device of metal foreign body and method |
| CN109638974A (en) * | 2019-01-10 | 2019-04-16 | 深圳大学 | A kind of inductive electric energy transmission system detection device for foreign matter and method |
| CN109873506A (en) * | 2019-04-03 | 2019-06-11 | 北京有感科技有限责任公司 | A kind of metal detection device |
| CN110103744A (en) * | 2019-06-21 | 2019-08-09 | 天津工业大学 | Metallic foreign body for wireless charging system for electric automobile expels device |
| CN112550013A (en) * | 2020-11-27 | 2021-03-26 | 华为技术有限公司 | Foreign matter detection assembly and transmitting device of wireless charging system and wireless charging system |
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2017
- 2017-06-28 CN CN201710512132.6A patent/CN109149792A/en not_active Withdrawn
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109638987A (en) * | 2019-01-10 | 2019-04-16 | 深圳大学 | A kind of wireless charging system detection device of metal foreign body and method |
| CN109638974A (en) * | 2019-01-10 | 2019-04-16 | 深圳大学 | A kind of inductive electric energy transmission system detection device for foreign matter and method |
| CN109873506A (en) * | 2019-04-03 | 2019-06-11 | 北京有感科技有限责任公司 | A kind of metal detection device |
| CN109873506B (en) * | 2019-04-03 | 2023-08-25 | 合肥有感科技有限责任公司 | Metal detection device |
| CN110103744A (en) * | 2019-06-21 | 2019-08-09 | 天津工业大学 | Metallic foreign body for wireless charging system for electric automobile expels device |
| CN110103744B (en) * | 2019-06-21 | 2023-11-21 | 天津工业大学 | Metal foreign body driving device for wireless charging system of electric automobile |
| CN112550013A (en) * | 2020-11-27 | 2021-03-26 | 华为技术有限公司 | Foreign matter detection assembly and transmitting device of wireless charging system and wireless charging system |
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Application publication date: 20190104 |