CN109638987A - A kind of wireless charging system detection device of metal foreign body and method - Google Patents
A kind of wireless charging system detection device of metal foreign body and method Download PDFInfo
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- CN109638987A CN109638987A CN201910022786.XA CN201910022786A CN109638987A CN 109638987 A CN109638987 A CN 109638987A CN 201910022786 A CN201910022786 A CN 201910022786A CN 109638987 A CN109638987 A CN 109638987A
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- magnetorheological fluid
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- fluid detector
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- charging system
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- 239000002184 metal Substances 0.000 title claims abstract description 35
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 35
- 238000001514 detection method Methods 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000012530 fluid Substances 0.000 claims abstract description 83
- 230000007246 mechanism Effects 0.000 claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 13
- 230000003321 amplification Effects 0.000 claims description 7
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 4
- 238000005253 cladding Methods 0.000 claims description 3
- 238000000518 rheometry Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 230000035945 sensitivity Effects 0.000 abstract description 2
- 230000008859 change Effects 0.000 description 4
- 239000013013 elastic material Substances 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000011344 liquid material Substances 0.000 description 1
- 239000006249 magnetic particle Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 230000032258 transport Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/60—Circuit arrangements or systems for wireless supply or distribution of electric power responsive to the presence of foreign objects, e.g. detection of living beings
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Computer Networks & Wireless Communication (AREA)
- Power Engineering (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
The invention discloses a kind of wireless charging system detection device of metal foreign body and methods, belong to wireless charging field, it include: magnetorheological fluid detector, movement executing mechanism and signal picker, contain magnetorheological fluid materials in the magnetorheological fluid detector, the output end of the magnetorheological fluid detector connects the input terminal of the signal picker, the movement executing mechanism controls the magnetorheological fluid detector and moves horizontally along primary coil, the present invention is scanned primary coil before primary coil is to secondary coil charging by movement executing mechanism control magnetorheological fluid detector, it can observe that metallic foreign body whether there is in primary coil by signal picker, play the technical effect of metallic foreign body detection, the configuration of the present invention is simple, detection sensitivity is high, it is low in cost.
Description
Technical field
The present invention relates to wireless charging field, especially a kind of wireless charging system detection device of metal foreign body and method.
Background technique
There is the following aspects in electric car induction type wireless charging system: first is that former secondary during the charging process
Magnetic field coupling region between the circle of sideline is not easy to be therefore easily perceived by humans when having foreign matter to enter；Second is that when have metallic foreign body (such as metal fragment,
Coin, pop can etc.) or organism foreign matter will affect former charging Distribution of Magnetic Field when there is coupling regime between former secondary coil,
To influence charge efficiency；Third is that the entrance of certain volume or the metallic foreign body of quantity can even make because of apparent power loss
Rise at the temperature of foreign matter, and then causes the serious consequences such as fire, device failure.
Summary of the invention
The present invention is directed to solve at least some of the technical problems in related technologies.For this purpose, of the invention
One purpose is to provide a kind of a kind of wireless charging system detection device of metal foreign body that can detecte metallic foreign body.
For this purpose, a second object of the present invention is to provide a kind of kind wireless charging system metals that can detecte metallic foreign body
Foreign matter detecting method.
The technical scheme adopted by the invention is that:
A kind of wireless charging system detection device of metal foreign body, comprising: magnetorheological fluid detector, movement executing mechanism and letter
Number collector contains magnetorheological fluid materials, the output end connection of the magnetorheological fluid detector in the magnetorheological fluid detector
The input terminal of the signal picker, the movement executing mechanism control the magnetorheological fluid detector and move along primary coil level
It is dynamic.
Further, the movement executing mechanism includes motion controller, motor driver and motion actuators, the fortune
The output end of movement controller connects the input terminal of the motor driver, and the output end of the motor driver connects the movement
The output end of the input terminal of actuator, the motion actuators connects the magnetorheological fluid detector, controls the magnetorheological fluid
Detector is mobile.
Further, the signal picker includes signal acquisition module and signal comparison module, the signal acquisition mould
The input terminal of block connects the output end of the magnetorheological fluid detector, and the output end of the signal acquisition module connects the signal
The input terminal of comparator.
Further, the magnetorheological fluid detector further includes having covering, and magnetorheological fluid materials, institute are arranged in the covering
It states covering to be made of the elastic material that magnetic conductivity is zero, the both ends of the covering are provided with sheet metal.
Further, the signal acquisition module includes pressure sensor or voltage sensor.
Further, the wireless charging system detection device of metal foreign body further includes controller, the controller it is defeated
Enter end to connect with the output end of the output end of the movement executing mechanism and the signal picker respectively, the controller passes through
Switch is connect with the power supply of the primary coil.
Further, the wireless charging system detection device of metal foreign body further includes alarm, the alarm it is defeated
Enter end to connect with the output end of the controller.
Second aspect, the present invention provide a kind of wireless charging system metal foreign matter detecting method, include the following steps:
Under primary coil energized state, control magnetorheological fluid detector is moved horizontally along the primary coil；
Judge whether the output voltage of signal picker is greater than the magnetorheological fluid detector in the preset value of predeterminable area；
Judge whether to complete entire primary coil scanning, if it is not, step is then repeated under primary coil energized state,
Control magnetorheological fluid detector is moved horizontally along the primary coil.
Further, it further comprises the steps of: when there are the output voltages of signal picker to be greater than preset value and magnetorheological fluid spy
When survey device completion is moved horizontally along entire primary coil, the primary coil power supply is cut off.
Further, the magnetorheological fluid detector the predeterminable area preset value by the primary coil in no metal
Under foreign matter state, magnetorheological fluid detector is determined along the output voltage of the primary coil horizontal movement, specifically:
The primary coil is divided into N number of predeterminable area along magnetorheological fluid detector motion direction, wherein N=b/
A, b are magnetorheological fluid detector motion direction primary coil length, and a is magnetic current detector cladding layer width；
When recording the magnetorheological fluid detector motion to predeterminable area, the voltage value of signal picker output, the electricity
Pressure value is preset value of the magnetorheological fluid detector in the predeterminable area.
The beneficial effects of the present invention are:
The present invention is right before primary coil is to secondary coil charging by movement executing mechanism control magnetorheological fluid detector
Primary coil is scanned, and can be observed that metallic foreign body whether there is in primary coil by signal picker, be played metal
The technical effect of foreign bodies detection, the configuration of the present invention is simple, detection sensitivity is high, low in cost, can be widely applied to wireless charging
Field.
Detailed description of the invention
Fig. 1 is a kind of structural principle of one specific embodiment of wireless charging system detection device of metal foreign body in the present invention
Figure；
Fig. 2 is a kind of structural representation of one specific embodiment of wireless charging system detection device of metal foreign body in the present invention
Figure；
Fig. 3 is that magnetorheological fluid is visited in a kind of one specific embodiment of wireless charging system detection device of metal foreign body in the present invention
Survey the structural schematic diagram of device；
Fig. 4 is a kind of flow chart of one specific embodiment of wireless charging system metal foreign matter detecting method in the present invention；
Fig. 5 is in the present invention in a kind of wireless charging system metal foreign matter detecting method one involved in a specific embodiment
The schematic diagram of kind wireless charging system detection device of metal foreign body.
Specific embodiment
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.
As shown in FIG. 1, FIG. 1 is one specific embodiments of wireless charging system detection device of metal foreign body a kind of in the present invention
Structure principle chart, comprising: magnetorheological fluid detector, movement executing mechanism and signal picker, in the magnetorheological fluid detector
Containing magnetorheological fluid materials, the output end of the magnetorheological fluid detector connects the input terminal of the signal picker, the fortune
Magnetorheological fluid detector described in dynamic actuating mechanism controls is moved horizontally along primary coil.
Magnetorheological fluid is dispersed in the suspension formed in non magnetic oils by magnetic-particle, and such material is in zero magnetic field
Newtonian fluid is shown as, under magnetic fields, the particle of magnetorheological fluid becomes from unordered random distribution state along external magnetic field
The threadiness or column that direction is orderly distributed, the mobility of magnetorheological fluid materials change, and show as Bingham fluid characteristic, this
Kind variation is reversible, rapidly, suitable for current repeatedly efficient detection case.When magnetorheological fluid is transformed into glue from liquid
When state, the resistance value of material and shear stress can all occur significantly to change under two states, and can be with magnetic field strength
Change and change, therefore the resistance value of material or shear stress can be used as and survey parameter easily to reflect the Distribution of Magnetic Field of primary coil
This difficult measurement.
(magnetic field strength is bigger, magnetic therein using electrology characteristic of the magnetorheological fluid materials under external magnetic field by the present invention
The resistance of rheology liquid material is smaller, and electric conductivity is stronger) and mechanical characteristic variation carry out foreign bodies detection.When metallic foreign body is fallen
When in primary coil, the variation of Distribution of Magnetic Field and magnetic field strength in primary coil can be caused, when magnetorheological fluid detector is by being somebody's turn to do
When field region, can sensitive magnetic reaction fields intensity variation, be can determine whether out by the variation of the numerical value of signal picker magnetorheological
There are metallic foreign bodies in liquid detector.
Specifically, movement executing mechanism includes motion controller, motor driver and motion actuators, the motion control
The output end of device connects the input terminal of the motor driver, and the output end of the motor driver connects the motion actuators
Input terminal, the output ends of the motion actuators connects the magnetorheological fluid detector, as shown in Fig. 2, magnetorheological fluid detects
Device 1 moves under the execution of movement mechanism along primary coil 2, wherein 3 be the direction of the magnetic line of force, 4 be secondary coil.
Motion controller controls the fixed magnetorheological fluid detector of motor driver control motion actuators and transports along assigned direction
It is dynamic.
Specifically, as shown in figure 3, magnetorheological fluid detector is formed by being wrapped in magnetorheological fluid elastic material 6 in covering 5,
Covering is made of the elastic material that magnetic conductivity is zero, and the both ends of the covering are provided with sheet metal, and signal acquisition module passes through gold
Belong to piece to contact with magnetorheological fluid detector.
As shown in Figure 1, the signal picker includes signal acquisition module, signal amplification module and signal comparison module,
The input terminal of the signal acquisition module connects the output end of the magnetorheological fluid detector, the output of the signal acquisition module
End connects the input terminal of the signal amplification module, and the output end of the signal amplification module connects the signal comparison module
Input terminal.
Signal picker is used to extract the output voltage at magnetorheological fluid detector both ends, and signal amplification module will be for that will export
Voltage amplifies, and signal comparison module is used for collected real-time voltage and the magnetorheological fluid spy when metallic foreign body is not present
The output voltage for surveying device both ends is compared, if the changing value of voltage is greater than preset value, proves that magnetorheological fluid detector is current
There are metallic foreign bodies in region.
Changes will occur for electric property and mechanical property in changing magnetic field for magnetorheological fluid, so correspondingly, signal
Acquisition module includes pressure sensor or voltage sensor.
It further include controller in the present embodiment, the output with the movement executing mechanism respectively of the input terminal of the controller
End is connected with the output end of the signal picker, and the controller is connect by switch with the power supply of the primary coil.
It further include alarm in the present embodiment, the input terminal of the alarm is connect with the output end of the controller.
When being tested with metallic foreign body, the dump of primary coil, alarm are sent alarm by controller.
As shown in figure 4, the invention also provides a kind of wireless charging system metal foreign matter detecting methods, including walk as follows
It is rapid:
S1, under primary coil energized state, control magnetorheological fluid detector is moved horizontally along the primary coil；
S2, judges whether the output voltage of signal picker is greater than the magnetorheological fluid detector in the pre- of the predeterminable area
If value；
S3 judges whether to complete entire primary coil scanning, if it is not, then repeating step in primary coil energized state
Under, control magnetorheological fluid detector is moved horizontally along the primary coil.
It further include step S4 in the present invention, when there are the output voltages of signal picker to be greater than preset value and magnetorheological fluid spy
When survey device completion is moved horizontally along entire primary coil, the primary coil power supply is cut off, security risk is avoided.
As shown in figure 5, stating magnetorheological fluid detector described in step S2 in the preset value of the predeterminable area by the original
Sideline is enclosed under no metallic foreign body state, and magnetorheological fluid detector is determined along the output voltage of the primary coil horizontal movement
It is fixed, specifically:
The primary coil is divided into N number of predeterminable area along magnetorheological fluid detector motion direction, wherein N=b/
A, b are magnetorheological fluid detector motion direction primary coil length, and a is magnetic current detector cladding layer width；
When recording the magnetorheological fluid detector motion to the predeterminable area, the voltage value of signal picker output is described
Voltage value is preset value of the magnetorheological fluid detector in the predeterminable area.
As shown in table 1, detector is a in the relative position of primary coil1、a2、a3、…、an, corresponding magnetic field strength point
It Wei not H1、H2、H3、…、Hn, according to magnetorheological fluid materials in the certain situation of applied field strengths, corresponding resistance value or shearing
Stress is certain, then output voltage values of the magnetorheological fluid detector in signal picker are respectively u1、u2、u3、…、un, will be above-mentioned
Voltage value is as the foundation for determining whether foreign matter；When actually detected, it is assumed that the output of magnetorheological fluid detector at various locations
Voltage value respectively corresponds u'1、u'2、u'3、…、u'n, then can be according to voltage difference | u'i-ui| the size of (i=1,2 ..., n) is sentenced
Reading has foreign: if | u'i-ui| < Δ ui (Δ ui is preset voltage difference threshold value, i=1,2 ..., n) then shows that there is no different
Object, conversely, then showing with the presence of foreign matter.
Table 1
It is to be illustrated to preferable implementation of the invention, but the invention is not limited to the implementation above
Example, those skilled in the art can also make various equivalent variations on the premise of without prejudice to spirit of the invention or replace
It changes, these equivalent deformations or replacement are all included in the scope defined by the claims of the present application.
Claims (10)
1. a kind of wireless charging system detection device of metal foreign body characterized by comprising magnetorheological fluid detector, movement are held
Row mechanism and signal picker contain magnetorheological fluid materials in the magnetorheological fluid detector, the magnetorheological fluid detector
Output end connects the input terminal of the signal picker, and the movement executing mechanism controls the magnetorheological fluid detector along primary side
Previous level is mobile.
2. a kind of wireless charging system detection device of metal foreign body according to claim 1, which is characterized in that the movement
Executing agency includes motion controller, motor driver and motion actuators, described in the output end connection of the motion controller
The input terminal of motor driver, the output end of the motor driver connect the input terminal of the motion actuators, the movement
The output end of actuator connects the magnetorheological fluid detector, and it is mobile to control the magnetorheological fluid detector.
3. a kind of wireless charging system detection device of metal foreign body according to claim 1, which is characterized in that the signal
Collector includes signal acquisition module, signal amplification module and signal comparison module, and the input terminal of the signal acquisition module connects
The output end of the magnetorheological fluid detector is connect, the output end of the signal acquisition module connects the defeated of the signal amplification module
Enter end, the output end of the signal amplification module connects the input terminal of the signal comparison module.
4. a kind of wireless charging system detection device of metal foreign body according to claim 1, which is characterized in that the magnetic current
Becoming liquid detector further includes having covering, and magnetorheological fluid materials, the elasticity that the covering is zero by magnetic conductivity are arranged in the covering
Material is constituted, and the both ends of the covering are provided with sheet metal.
5. a kind of wireless charging system detection device of metal foreign body according to claim 3, which is characterized in that the signal
Acquisition module includes pressure sensor or voltage sensor.
6. a kind of wireless charging system detection device of metal foreign body according to claim 1-5 further includes control
Device, the input terminal of the controller connect with the output end of the output end of the movement executing mechanism and the signal picker respectively
It connects, the controller is connect by switch with the power supply of the primary coil.
7. a kind of wireless charging system detection device of metal foreign body according to claim 6, further includes alarm, the report
The input terminal of alert device is connect with the output end of the controller.
8. it is described in any item a kind of wireless to be applied to claim 1 to 7 for a kind of wireless charging system metal foreign matter detecting method
Charging system detection device of metal foreign body, which comprises the steps of:
Under primary coil energized state, control magnetorheological fluid detector is moved horizontally along the primary coil；
Judge whether the output voltage of signal picker is greater than the magnetorheological fluid detector in the preset value of predeterminable area；
Judge whether that complete entire primary coil scanning controls if it is not, then repeating step under primary coil energized state
Magnetorheological fluid detector is moved horizontally along the primary coil.
9. a kind of wireless charging system metal foreign matter detecting method according to claim 8, which is characterized in that further include step
It is rapid: when there are the output voltages of signal picker greater than preset value and magnetorheological fluid detector is completed along entire primary coil level
When mobile, the primary coil power supply is cut off.
10. a kind of wireless charging system metal foreign matter detecting method according to claim 8, which is characterized in that the magnetic
Rheology liquid detector the predeterminable area preset value by the primary coil under no metallic foreign body state, magnetorheological fluid detection
Device determined along the output voltage of the primary coil horizontal movement, specifically:
The primary coil is divided into N number of predeterminable area along magnetorheological fluid detector motion direction, wherein N=b/a, b
For magnetorheological fluid detector motion direction primary coil length, a is magnetic current detector cladding layer width；
When recording the magnetorheological fluid detector motion to the predeterminable area, the voltage value of signal picker output, the voltage
Value is preset value of the magnetorheological fluid detector in the predeterminable area.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910022786.XA CN109638987A (en) | 2019-01-10 | 2019-01-10 | A kind of wireless charging system detection device of metal foreign body and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910022786.XA CN109638987A (en) | 2019-01-10 | 2019-01-10 | A kind of wireless charging system detection device of metal foreign body and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110912284A (en) * | 2019-11-18 | 2020-03-24 | 维沃移动通信有限公司 | Wireless charging control method and wireless charging assembly |
| CN111682654A (en) * | 2020-05-11 | 2020-09-18 | 哈尔滨工业大学 | Design method of intelligent foreign matter detection system for wireless power transmission |
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| CN104134313A (en) * | 2014-03-09 | 2014-11-05 | 浙江师范大学 | Selective alarm based on magnetorheological fluid |
| DE102016002171A1 (en) * | 2016-02-24 | 2016-10-27 | Daimler Ag | Device for detecting a metallic object |
| CN109149792A (en) * | 2017-06-28 | 2019-01-04 | 乐金电子研发中心(上海)有限公司 | Foreign substance detection system and its method for detecting metallic foreign body |
| CN209313537U (en) * | 2019-01-10 | 2019-08-27 | 深圳大学 | A kind of wireless charging system detection device of metal foreign body |
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2019
- 2019-01-10 CN CN201910022786.XA patent/CN109638987A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104134313A (en) * | 2014-03-09 | 2014-11-05 | 浙江师范大学 | Selective alarm based on magnetorheological fluid |
| DE102016002171A1 (en) * | 2016-02-24 | 2016-10-27 | Daimler Ag | Device for detecting a metallic object |
| CN109149792A (en) * | 2017-06-28 | 2019-01-04 | 乐金电子研发中心(上海)有限公司 | Foreign substance detection system and its method for detecting metallic foreign body |
| CN209313537U (en) * | 2019-01-10 | 2019-08-27 | 深圳大学 | A kind of wireless charging system detection device of metal foreign body |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110912284A (en) * | 2019-11-18 | 2020-03-24 | 维沃移动通信有限公司 | Wireless charging control method and wireless charging assembly |
| CN111682654A (en) * | 2020-05-11 | 2020-09-18 | 哈尔滨工业大学 | Design method of intelligent foreign matter detection system for wireless power transmission |
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