CN109828309A - Detection device of metal foreign body, wireless charging system and method - Google Patents
Detection device of metal foreign body, wireless charging system and method Download PDFInfo
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- CN109828309A CN109828309A CN201910189175.4A CN201910189175A CN109828309A CN 109828309 A CN109828309 A CN 109828309A CN 201910189175 A CN201910189175 A CN 201910189175A CN 109828309 A CN109828309 A CN 109828309A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
Abstract
The application provides a kind of detection device of metal foreign body, wireless charging system and method.The detection device of metal foreign body includes giant magnetic impedance device and voltage detector.The voltage detector is used to detect the voltage change of the giant magnetic impedance device.The characteristic that there is the giant magnetic impedance device resistivity to change with magnetic field size.When treating the progress metallic foreign body detection of detection position, the detection device of metal foreign body is powered.If the voltage detector detects that the voltage value at giant magnetic impedance device both ends jumps, determine that there are metallic foreign bodies for the position to be detected.The detection device of metal foreign body is able to achieve high-precision foreign bodies detection function by the characteristic of the giant magnetic impedance device.
Description
Technical field
This application involves detection technique field, more particularly to a kind of detection device of metal foreign body, wireless charging system and
Method.
Background technique
Automobile wireless charging technique refers to not by conducting wire, incudes skill using electromagnetic induction principle or other associated ACs
Art provides electric energy for automobile power cell.Ease of use, charging security possessed by wireless charging, vehicle-net electric energy transmission
The particular advantages such as flexibility, unmanned electric vehicle applicability, so that wireless charging technology has more wide development empty
Between.
The automobile wireless charging of mainstream is to realize energy transmission by magnetic field at present, when transmitting coil and receiving coil it
Between there are when foreign matter, especially metallic foreign body, alternating magnetic field can generate vortex in metallic foreign body, can not only reduce rechargeable energy
Efficiency is more likely to result in foreign matter temperature rise and even causes catching fire.Therefore the foreign bodies detection of automobile wireless charging is to guarantee to fill
The safe and efficient important technology of electricity.
Traditional foreign matter detecting method is difficult to standard when small metallic foreign body, high-power, charging system have offset
Really detect foreign matter.
Summary of the invention
Based on this, it is necessary to for the low problem of traditional foreign matter detecting method detection accuracy, provide a kind of metallic foreign body
Detection device, wireless charging system and method.
A kind of detection device of metal foreign body, comprising:
Giant magnetic impedance device, for detecting the changes of magnetic field of position to be measured；And
Voltage detector is connected in parallel in the both ends of the giant magnetic impedance device, for detecting the giant magnetic impedance device
The voltage value at both ends；
The detection device of metal foreign body is powered, metallic foreign body detection is carried out to the position to be detected, if the electricity
Pressure detector detects that the voltage value at giant magnetic impedance device both ends is greater than the maximum value or described of alarm security threshold range
Voltage value is less than the minimum value of the alarm security threshold range, then determines that there are metallic foreign bodies for the position to be detected.
The giant magnetic impedance device is giant magnetoresistance, in the perhaps huge magnetoelectricity sense of huge magnetoelectricity in one of the embodiments,
It is one or more.
In one of the embodiments, further include:
Detection plate, giant magnetic impedance device fixed setting in the detection plate.
The detection plate is one of pcb board, plastic board or veneer in one of the embodiments,.
The giant magnetic impedance device is multiple in one of the embodiments,；
The multiple giant magnetic impedance device is arranged in array, and is fixedly installed in the detection plate；
The voltage detector be it is multiple, each voltage detector is connected in parallel in the giant magnetic impedance device
Both ends.
In one of the embodiments, further include:
Processor is electrically connected with the voltage detector；
Alarm is electrically connected with the processor, and the processor is for controlling the alarm output warning message.
In one of the embodiments, further include:
Memory is electrically connected with the processor, for storing alarm security threshold range；
The processor is also used to make comparisons the voltage value with the alarm security threshold range, and ties according to comparing
Fruit controls the alarm and exports warning message.
The alarm includes: in one of the embodiments,
Indicator light is electrically connected with the processor, for exporting warning message by light；
Buzzer is electrically connected with the processor, for exporting warning message by sound.
In one of the embodiments, further include:
Communication equipment is electrically connected with the processor, for sending the warning message to external equipment.
The communication interface of the communication equipment is GPRS interface, blue tooth interface, CAN bus in one of the embodiments,
One of interface or WIFI interface are a variety of.
A kind of wireless charging system, comprising:
Emitter, including transmitting coil；
Reception device, including receiving coil, the transmitting coil are of coupled connections with the receiving coil, for generating induction
Voltage；And
Such as the described in any item detection device of metal foreign body of above-described embodiment, it is set to the transmitting coil and the reception
Between coil；
When between the emitter and the reception device, when carrying out metallic foreign body detection, by the metallic foreign body
Detection device is powered, if the voltage detector detects that the voltage value at giant magnetic impedance device both ends is greater than alarm security threshold
The maximum value or the voltage value that are worth range are less than the minimum value of the alarm security threshold range, then determine the transmitting dress
Set between the reception device that there are metallic foreign bodies.
The emitter in one of the embodiments, further include:
Expelling plate, the transmitting coil are integrated in the expelling plate；
The expelling plate has the surface of emission, and the detection device of metal foreign body is integrated in the surface of emission and the emission lines
Between circle.
In one of the embodiments, further include:
Charge controller is electrically connected with the detection device of metal foreign body, for examining in the detection device of metal foreign body
It measures there are when foreign matter, stops wireless charging.
Metal foreign matter detecting method in a kind of wireless charging system, the metal foreign matter detecting method is for realizing such as above-mentioned
The detection of metallic foreign body in wireless charging system described in embodiment, the detection method include:
Detection device of metal foreign body is set between the transmitting coil and the receiving coil；
The wireless charging system is opened, the voltage at giant magnetic impedance device both ends is obtained by the voltage detector
Value；
Judge whether the voltage value is in alarm security threshold range by the processor；
If the voltage value is greater than the maximum value of the alarm security threshold range or the voltage value is less than the alarm
The minimum value of secure threshold range, then there are metallic foreign bodies between the emitter and the reception device.
The application provides a kind of detection device of metal foreign body, wireless charging system and method.The metallic foreign body detection dress
It sets including giant magnetic impedance device and voltage detector.The voltage that the voltage detector is used to detect the giant magnetic impedance device becomes
Change.The characteristic that there is the giant magnetic impedance device impedance to change with magnetic field size.It treats detection position and carries out metallic foreign body inspection
When survey, the detection device of metal foreign body is powered.If the voltage value is greater than maximum value or the institute of alarm security threshold range
The minimum value that voltage value is less than the alarm security threshold range is stated, then determines that there are metallic foreign bodies for the position to be detected.Institute
It states detection device of metal foreign body and high-precision foreign bodies detection function is able to achieve by the characteristic of the giant magnetic impedance device.
Detailed description of the invention
Fig. 1 is a kind of detection device of metal foreign body structure chart that the application one embodiment provides；
Fig. 2 is a kind of detection device of metal foreign body structure chart that the application one embodiment provides；
Fig. 3 is a kind of giant magnetic impedance device setting structure figure that the application one embodiment provides；
Fig. 4 is a kind of wireless charging system structure chart that the application one embodiment provides；
Fig. 5 is a kind of wireless charging system structure chart that the application one embodiment provides.
Main element drawing reference numeral explanation
Detection device of metal foreign body 100
Giant magnetic impedance device 20
Voltage detector 30
Detection plate 40
Processor 50
Alarm 60
Indicator light 61
Buzzer 62
Memory 70
Communication equipment 80
Wireless charging system 200
Emitter 110
Expelling plate 111
The surface of emission 101
Transmitting coil 112
Reception device 120
Receiving coil 121
Charge controller 130
Specific embodiment
In order to make the above objects, features, and advantages of the present application more apparent, with reference to the accompanying drawing to the application
Specific embodiment be described in detail.Many details are explained in the following description in order to fully understand this Shen
Please.But the application can be implemented with being much different from other way described herein, those skilled in the art can be not
Similar improvement is done in the case where violating the application intension, therefore the application is not limited by following public specific implementation.
It should be noted that it can directly on the other element when element is referred to as " being set to " another element
Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it, which can be, is directly connected to
To another element or it may be simultaneously present centering elements.
Unless otherwise defined, all technical and scientific terms used herein and the technical field for belonging to the application
The normally understood meaning of technical staff is identical.The term used in the description of the present application is intended merely to description tool herein
The purpose of the embodiment of body, it is not intended that in limitation the application.Term " and or " used herein includes one or more phases
Any and all combinations of the listed item of pass.
Referring to Figure 1, the application one embodiment provides a kind of detection device of metal foreign body 100.The metallic foreign body inspection
Surveying device 100 includes giant magnetic impedance device 20 and voltage detector 30.
The giant magnetic impedance device 20 is used to detect the changes of magnetic field of position to be measured.The voltage detector 30 is connected in parallel
In the both ends of the giant magnetic impedance device 20, for detecting the voltage value at 20 both ends of giant magnetic impedance device.To described to be checked
When location sets progress metallic foreign body detection, the detection device of metal foreign body 100 is powered, if the voltage detector 30 detects
Voltage value to 20 both ends of giant magnetic impedance device is greater than the maximum value of alarm security threshold range or the voltage value is less than
The minimum value of the alarm security threshold range then determines that there are metallic foreign bodies for the position to be detected.
The giant magnetic impedance device 20 has impedance with the characteristic of magnetic field size variation.The giant magnetic impedance device 20 has
The characteristics of structure is small and simple, high sensitivity.The giant magnetic impedance device 20 can be giant magnetoresistance, the perhaps huge magnetoelectricity of huge magnetoelectricity
One of sense is a variety of.With no restrictions to the voltage detector 30, as long as 20 liang of the giant magnetic impedance device can be detected
The voltage at end.The voltage detector 30 can be potentiometer, voltage sensor or the chip with voltage detecting circuit.
The detection accuracy that the alarm security threshold range can according to need arbitrarily is set.
It, can be with when the giant magnetic impedance device 20 is giant magnetoresistance, and when treating detection position and carrying out metallic foreign body detection
A stable DC stream source is provided to the giant magnetoresistance.And a DC power supply is provided to the voltage detector 30.
The voltage detector 30 detects the giant magnetic impedance device by detecting the voltage at 20 both ends of giant magnetic impedance device
20 resistance variations.It can detecte the magnetic of the position to be detected according to the variation for the resistance for detecting the giant magnetic impedance device 20
Field variation.And then the purpose for detecting the presence of metallic foreign body is realized according to the changes of magnetic field.
When the giant magnetic impedance device 20 be huge magnetoelectricity sense or huge magnetocapacitance, and treat detection position carry out metallic foreign body inspection
When survey, a stable ac current source can be provided to the huge magnetoelectricity sense or huge magnetocapacitance.And to the voltage detector
30 provide a DC power supply.The voltage detector 30 passes through the alternating voltage for detecting 20 both ends of giant magnetic impedance device,
And then detect the induction reactance variation or the capacitive reactance of huge magnetocapacitance variation of the huge magnetoelectricity sense.Changed according to the induction reactance or described
Capacitive reactance changes the changes of magnetic field that can detecte the position to be detected.And then metal is detected the presence of according to changes of magnetic field realization
The purpose of foreign matter.
In the present embodiment, the detection device of metal foreign body 100 includes giant magnetic impedance device 20 and voltage detector 30.Institute
Voltage detector 30 is stated for detecting the voltage change of the giant magnetic impedance device 20.The giant magnetic impedance device 20 has impedance
The characteristic changed with magnetic field size.When treating the progress metallic foreign body detection of detection position, by the detection device of metal foreign body
100 are powered.If the voltage value is greater than the maximum value of alarm security threshold range or the voltage value is less than the alarm security
The minimum value of threshold range then determines that there are metallic foreign bodies for the position to be detected.The detection device of metal foreign body 100 passes through
The characteristic of the giant magnetic impedance device 20 is able to achieve high-precision foreign bodies detection function.The detection device of metal foreign body 100 has
Have the characteristics that structure is simple, high sensitivity noise immunity is strong.
Fig. 2 is referred to, the detection device of metal foreign body 100 further includes processor 50, report in one of the embodiments,
Alert device 60 and memory 70.
The processor 50 is electrically connected with the voltage detector 30.The alarm 60 is electrically connected with the processor 50
It connects.The processor 50 exports warning message for controlling the alarm 60.The memory 70 and 50 electricity of processor
Connection.The memory 70 is for storing alarm security threshold range.The storage alarm security threshold range can be multiple.
The corresponding storage alarm security threshold range of each described giant magnetic impedance device 20.One storage alarm security
Threshold range can be not exactly the same with storage alarm security threshold range described in other.Also, each storage alarm peace
Full threshold range can change.The processor 50 is also used to the voltage value and the alarm security threshold range making ratio
Compared with, and the alarm 60 is controlled according to comparison result and exports warning message.
The processor 50 can be microprocessor or single-chip microcontroller.The memory 70 can be to be integrated in the processor
50 chip.The memory 70 can also be the memory element being separately provided.The alarm 60 can be 61 He of indicator light
Buzzer 62.The indicator light 61 is electrically connected with the processor 50.The indicator light 61 is used to export alarm signal by light
Breath.The buzzer 62 is electrically connected with the processor 50.The buzzer 62 is used to export warning message by sound.
In the present embodiment, when there is metallic foreign body in the position to be detected, the detection device of metal foreign body 100 passes through institute
It states processor 50, the alarm 60 and the memory 70 may be implemented and alarm, to notify current operation personnel.
The detection device of metal foreign body 100 further includes communication equipment 80 in one of the embodiments,.
The communication equipment 80 is electrically connected with the processor 50.The communication equipment 80 is for sending the warning message
To external equipment.The communication interface of the communication equipment 80 is GPRS interface, blue tooth interface, CAN interface or WIFI interface
One of or it is a variety of.The external equipment can be remote terminal or other control systems.The remote terminal can be hand
Machine or computer.The other control systems can be with charge controller.
In the present embodiment, when there is metallic foreign body in the position to be detected, the processor 50 can pass through the communication
The warning message is sent to the external equipment by equipment 80.The external equipment can be carried out according to the warning message into
The movement of one step is reacted to avoid the warning message that current operation personnel cannot in time issue the warning device 60
Problem.
Fig. 3 is referred to, the detection device of metal foreign body 100 further includes detection plate 40 in one of the embodiments,.
In the fixed setting of giant magnetic impedance device 20 and the detection plate 40.The shape of the detection plate 40 does not limit
It is fixed.The detection plate 40 can be one of pcb board, plastic board or veneer.
Further, the giant magnetic impedance device 20 is multiple.The multiple giant magnetic impedance device 20 can be arranged in array
Cloth is fixedly installed in the detection plate 40.A kind of set-up mode of the multiple giant magnetic impedance device 20 is as shown in Figure 3.Institute
Stating multiple giant magnetic impedance devices 20 can be fixedly installed in the detection plate 40 with random.The voltage detector 30 can
Think multiple.Each voltage detector 30 is connected in parallel in the both ends of a giant magnetic impedance device 20.The multiple electricity
Press the position of detector 30 without limitation.The multiple voltage detector 30 can be fixedly installed in the detection plate 40.Institute
Stating multiple voltage detectors 30 can also be separately positioned in two pieces of detection plates with the giant magnetic impedance device 20.The voltage inspection
Surveying device 30 can also be one.When the voltage detector 30 be one when, the voltage detector 30 have multichannel input and
Multiple-channel output, to detect the voltage at the both ends of each giant magnetic impedance device 20.
In the present embodiment, 20 structure of giant magnetic impedance device is small.It, will be more when the giant magnetic impedance device 20 is multiple
A giant magnetic impedance device 20 is fixedly installed in the detection plate 40.It fixes and examines convenient for the multiple giant magnetic impedance device 20
It surveys.
Fig. 4 is referred to, the application one embodiment provides a kind of wireless charging system 200.The wireless charging system 200
Including emitter 110, reception device 120, the described in any item detection device of metal foreign body 100 of such as above-described embodiment.
The emitter 110.Including transmitting coil 112.The reception device 120 includes receiving coil 121, the hair
Ray circle 112 is of coupled connections with the receiving coil 121, for generating induced voltage.The detection device of metal foreign body 100 is set
It is placed between the transmitting coil 112 and the receiving coil 121.The detection device of metal foreign body 100 can integrate in institute
It states in emitter.The detection device of metal foreign body 100 can also be set to the emitter 110 and the reception device
Between 120.
When to metallic foreign body detection is carried out between the emitter 110 and the reception device 120, by the metal
Detection device for foreign matter 100 is powered.If the voltage detector 30 detects that the voltage value at 20 both ends of giant magnetic impedance device is big
It is less than the minimum value of the alarm security threshold range in the maximum value of alarm security threshold range or the voltage value, then sentences
There are metallic foreign bodies between the fixed emitter 110 and the reception device 120.
In the present embodiment, the wireless charging system 200 can by the emitter 110 and the reception device 120
To realize wireless charging function.The wireless charging system 200 may be implemented to detect by the detection device of metal foreign body 100
Whether there is or not the functions of metallic foreign body between the emitter 110 and the reception device 120.
In one of the embodiments, in order to allow the comprehensive and accurate detection institute of the detection device of metal foreign body 100
The metal between emitter 110 and the reception device 120 is stated, the detection of the detection device of metal foreign body 100 can be made
Area is more than or equal to the area of the emitter 110.
Fig. 5 is referred to, the emitter 110 further includes expelling plate 111 in one of the embodiments,.The transmitting
Coil 112 is integrated in the expelling plate 111.The expelling plate 111 has the surface of emission 101.The surface of emission 101 is the hair
One side of the injection device 110 close to the reception device 120.The i.e. described surface of emission 101 is the outer surface of the emitter 110.
When the detection device of metal foreign body 100 can integrate when in the emitter, the detection device of metal foreign body 100 collects
Between the surface of emission 101 and the transmitting coil 112 described in Cheng Yu.The detection device of metal foreign body 100 is set to the transmitting
Between face 101 and the transmitting coil 112, the metal between the transmitting coil 112 and the reception device 120 can detecte
Foreign matter.
The wireless charging system 200 further includes charge controller 130 in one of the embodiments,.
The charge controller 130 is electrically connected with the detection device of metal foreign body 100.The charge controller 130 is used
In when the detection device of metal foreign body 100 detects the presence of foreign matter, stop wireless charging.It is filled when the metallic foreign body detects
When setting 100 and detecting metallic foreign body, the detection device of metal foreign body 100 can be by the communication equipment 80 by warning message
It is sent to the charge controller 130.After the charge controller 130 receives the warning message, the hair can be disconnected
The coupling between equipment 110 and the receiving device 120 is sent, and then stops wireless charging function.
The application one embodiment provides metal foreign matter detecting method in a kind of wireless charging system.The metallic foreign body inspection
Survey method for realizing metallic foreign body in the wireless charging system 200 as described in above-described embodiment detection.The detection method
Include:
Detection device of metal foreign body 100 is set between the transmitting coil 112 and the receiving coil 121.It opens
The wireless charging system 200.The voltage value at 20 both ends of giant magnetic impedance device is obtained by the voltage detector 30.It is logical
It crosses the processor 50 and judges whether the voltage value is in alarm security threshold range.If the voltage value is greater than the report
The maximum value of alert secure threshold range or the voltage value are less than the minimum value of the alarm security threshold range, then the hair
There are metallic foreign bodies between injection device 110 and the reception device 120.
In the present embodiment, the detection method passes through giant magnetic impedance device described in the detection device of metal foreign body 100
10 characteristic is able to achieve high-precision foreign bodies detection function.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The several embodiments of the application above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
The limitation to claim therefore cannot be interpreted as.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the concept of this application, various modifications and improvements can be made, these belong to the protection of the application
Range.Therefore, the scope of protection shall be subject to the appended claims for the application patent.
Claims (14)
1. a kind of detection device of metal foreign body (100) characterized by comprising
Giant magnetic impedance device (20), for detecting the changes of magnetic field of position to be measured；And
Voltage detector (30) is connected in parallel in the both ends of the giant magnetic impedance device (20), for detecting the giant magnetic impedance
The voltage value at device (20) both ends；
When carrying out metallic foreign body detection to the position to be detected, the detection device of metal foreign body (100) are powered, if described
Voltage value is less than the minimum of the alarm security threshold range greater than the maximum value of alarm security threshold range or the voltage value
Value, then determine that there are metallic foreign bodies for the position to be detected.
2. detection device of metal foreign body (100) according to claim 1, which is characterized in that the giant magnetic impedance device
It (20) is one of giant magnetoresistance, the perhaps huge magnetoelectricity sense of huge magnetoelectricity or a variety of.
3. detection device of metal foreign body (100) according to claim 1, which is characterized in that further include:
Detection plate (40), the giant magnetic impedance device (20) fixed setting on the detection plate (40).
4. detection device of metal foreign body (100) according to claim 3, which is characterized in that the detection plate (40) is PCB
One of plate, plastic board or veneer.
5. detection device of metal foreign body (100) according to claim 3, which is characterized in that the giant magnetic impedance device
It (20) is multiple；
The multiple giant magnetic impedance device (20) is arranged in array, and is fixedly installed on the detection plate (40)；
The voltage detector (30) be it is multiple, each voltage detector (30) is connected in parallel in the giant magnetic impedance device
The both ends of part (20).
6. detection device of metal foreign body (100) according to claim 1, which is characterized in that further include:
Processor (50) is electrically connected with the voltage detector (30)；
Alarm (60) is electrically connected with the processor (50), and the processor (50) is defeated for controlling the alarm (60)
Warning message out.
7. detection device of metal foreign body (100) according to claim 6, which is characterized in that further include:
Memory (70) is electrically connected, for storing alarm security threshold range with the processor (50)；
The processor (50) is also used to make comparisons the voltage value with the alarm security threshold range, and ties according to comparing
Fruit controls the alarm (60) and exports warning message.
8. detection device of metal foreign body (100) according to claim 6, which is characterized in that the alarm (60) includes:
Indicator light (61) is electrically connected, for exporting warning message by light with the processor (50)；
Buzzer (62) is electrically connected, for exporting warning message by sound with the processor (50).
9. detection device of metal foreign body (100) according to claim 6, which is characterized in that further include:
Communication equipment (80) is electrically connected with the processor (50), for sending the warning message to external equipment.
10. detection device of metal foreign body (100) according to claim 9, which is characterized in that the communication equipment (80)
Communication interface is one of GPRS interface, blue tooth interface, CAN interface or WIFI interface or a variety of.
11. a kind of wireless charging system (200) characterized by comprising
Emitter (110), including transmitting coil (112)；
Reception device (120), including receiving coil (121), the transmitting coil (112) couple with the receiving coil (121)
Connection, for generating induced voltage；And
Such as above-mentioned detection device of metal foreign body (100) of any of claims 1-10, it is set to the transmitting coil
(112) between the receiving coil (121)；
When to metallic foreign body detection is carried out between the emitter (110) and the reception device (120), by the metal
Detection device for foreign matter (100) is powered, if the voltage detector (30) detects the electricity at giant magnetic impedance device (20) both ends
Pressure value is less than the minimum of the alarm security threshold range greater than the maximum value of alarm security threshold range or the voltage value
Value, then determine that there are metallic foreign bodies between the emitter (110) and the reception device (120).
12. wireless charging system (200) according to claim 11, which is characterized in that the emitter (110) is also wrapped
It includes:
Expelling plate (111), the transmitting coil (112) are integrated in the expelling plate (111)；
The expelling plate (111) has the surface of emission (101), and the detection device of metal foreign body (100) is integrated in the surface of emission
(101) between the transmitting coil (112).
13. wireless charging system (200) according to claim 11, which is characterized in that further include:
Charge controller (130) is electrically connected with the detection device of metal foreign body (100), for detecting in the metallic foreign body
When device (100) detects the presence of foreign matter, stop wireless charging.
14. metal foreign matter detecting method in a kind of wireless charging system, which is characterized in that the metal foreign matter detecting method is used for
Realize the detection of metallic foreign body in the wireless charging system (200) as described in claim 11-14, the detection method includes:
Detection device of metal foreign body (100) is set between the transmitting coil (112) and the receiving coil (121)；
The wireless charging system (200) are opened, obtain the giant magnetic impedance device (20) by the voltage detector (30)
The voltage value at both ends；
Judge whether the voltage value is in alarm security threshold range by the processor (50)；
If the voltage value is greater than the maximum value of the alarm security threshold range or the voltage value is less than the alarm security
The minimum value of threshold range, then there are metallic foreign bodies between the emitter (110) and the reception device (120).
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114572021A (en) * | 2022-02-10 | 2022-06-03 | 深圳市车多多科技有限公司 | Reverse wireless charging method and automobile |
| CN117110423A (en) * | 2023-10-23 | 2023-11-24 | 沈阳仪表科学研究院有限公司 | Wireless nondestructive testing sensor |
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