CN109143385A - Detection device of metal foreign body applied to wireless charging system - Google Patents
Detection device of metal foreign body applied to wireless charging system Download PDFInfo
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- CN109143385A CN109143385A CN201710507552.5A CN201710507552A CN109143385A CN 109143385 A CN109143385 A CN 109143385A CN 201710507552 A CN201710507552 A CN 201710507552A CN 109143385 A CN109143385 A CN 109143385A
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- foreign body
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- charging system
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
- G01V3/10—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils
- G01V3/101—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils by measuring the impedance of the search coil; by measuring features of a resonant circuit comprising the search coil
- G01V3/102—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils by measuring the impedance of the search coil; by measuring features of a resonant circuit comprising the search coil by measuring amplitude
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- Environmental & Geological Engineering (AREA)
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- General Physics & Mathematics (AREA)
- Geophysics (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The present invention provides a kind of detection device of metal foreign body applied to wireless charging system, comprising: alternating-current voltage source, for providing AC analogue voltage；The one or more branches in parallel with alternating-current voltage source, each branch include: one or more concatenated coil, between the receiving end and transmitting terminal in wireless charging system；With the concatenated resistance of coil；High frequency peaks detection circuit, the first input end of high frequency peaks detection circuit and one end of resistance connect, the connection of the other end of second input terminal and resistance, for converting DC simulation voltage for the AC analogue voltage at resistance both ends, the value of DC simulation voltage is the peak value of AC analogue voltage.Detection device of metal foreign body further include: warning device；Processor, the DC simulation voltage for being exported according to each high frequency peaks detection circuit, control warning device export warning message.The present invention can detecte minute metallic foreign matter, shortens detection time, avoids security risk in a high temperauture environment.
Description
Technical field
The present invention relates to metal detection fields, and in particular, to a kind of metallic foreign body inspection applied to wireless charging system
Survey device.
Background technique
Currently, still none reliable detection device of metal foreign body can go detection wireless charging system in it is small
Metallic foreign body.Traditional detection device of metal foreign body is mainly used in small-power (5W~10W) wireless charging system, according to nothing
The standard for the QI that line charge Electricity Federation alliance WPC (Wireless Power Consortium) is formulated designs, by issue side power,
The difference of receiving side power changes judgement according to difference whether to have metallic foreign body.But low-power wireless charging system is with big
The volume and transmission range of power wireless charging system all differ greatly, so the small small metallic foreign body of power loss is difficult to be detected
It measures and.Therefore, traditional detection device of metal foreign body can not be applied in high-power wireless charging system.There are some scholars logical
It crosses the variation of detection efficiency of transmission and judges whether there is metallic foreign body；But the transmission of the small metallic foreign body in wireless charging system is imitated
Rate has almost no change, and this detection mode is difficult to detect the lesser metallic foreign body of volume ratio.Also some scholars pass through detection
The variation of coil surface temperature judges whether there is metallic foreign body；The obvious shortcoming of this detection mode be detection time relatively
Long (minute rank), and under high temperature environment, it is hidden to there is safety in excessively high coil temperature easy burn-out detection device of metal foreign body
Suffer from.
Summary of the invention
The embodiment of the present invention provides a kind of detection device of metal foreign body applied to wireless charging system, wireless to detect
Minute metallic foreign matter in charging system.
To achieve the goals above, the embodiment of the present invention provides a kind of metallic foreign body detection applied to wireless charging system
Device, comprising: alternating-current voltage source, for providing AC analogue voltage；The one or more branches in parallel with alternating-current voltage source, often
A branch includes: one or more concatenated coil, between the receiving end and transmitting terminal in wireless charging system；With line
Enclose concatenated resistance；High frequency peaks detection circuit, the first input end of high frequency peaks detection circuit and one end of resistance connect, high
Second input terminal of frequency peak detection circuit and the other end of resistance connect, for converting the AC analogue voltage at resistance both ends
For DC simulation voltage, the value of DC simulation voltage is the peak value of AC analogue voltage；Detection device of metal foreign body further include: report
Alarm device；The processor being connect respectively with the output end of warning device, each high frequency peaks detection circuit, for according to each high frequency peak
It is worth the DC simulation voltage of detection circuit output, control warning device exports warning message.
In a kind of wherein embodiment, each coil is respectively positioned in a PCB detection plate；The area of PCB detection plate be greater than or
Equal to the reception end area in wireless charging system.
In a kind of wherein embodiment, the radius of each coil is 3cm-4cm.
In a kind of wherein embodiment, further includes: memory connected to the processor, for storing alarming threshold value；Processing
Implement body is used for: DC simulation voltage being made comparisons with alarming threshold value, warning device is controlled according to comparison result and exports alarm signal
Breath.
In a kind of wherein embodiment, processor further include: analog-digital converter, for DC simulation voltage to be converted to directly
Streaming digital voltage；
In a kind of wherein embodiment, warning device includes: indicator light and or buzzer；Indicator light is for passing through light
Export warning message；Buzzer is used to export warning message by sound.
In a kind of wherein embodiment, further includes: communication equipment connected to the processor, for sending warning message to outer
Portion's equipment.
In a kind of wherein embodiment, the communication interface of communication equipment is GPRS interface, blue tooth interface, CAN interface
Or WIF interface.
The detection device of metal foreign body applied to wireless charging system of the embodiment of the present invention, alternating-current voltage source provide exchange
Analog voltage, coil are located at the receiving end in wireless charging system and between transmitting terminals, and resistance is connected with coil, high frequency peaks inspection
Slowdown monitoring circuit converts the AC analogue voltage at resistance both ends to the DC simulation voltage that value is AC analogue voltage peak, processor
Warning device display alarm information is controlled according to DC simulation voltage.Because the embodiment of the present invention is detected by voltage change
Metallic foreign body shortens detection time, avoids so compared with prior art, the present invention can detecte more minute metallic foreign matter
Security risk in a high temperauture environment.
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 structure chart in the embodiment of the present invention applied to the detection device of metal foreign body of wireless charging system；
Fig. 2 is that alternating current flows through no metallic foreign body coil schematic diagram in the embodiment of the present invention；
Fig. 3 is the equivalent circuit diagram that alternating current flows through no metallic foreign body coil in the embodiment of the present invention；
Fig. 4 is that alternating current flows through and has metallic foreign body coil schematic diagram in the embodiment of the present invention；
Fig. 5 is that alternating current flows through the equivalent circuit diagram for having metallic foreign body coil in the embodiment of the present invention；
Fig. 6 is the coil schematic diagram in the embodiment of the present invention.
Fig. 7 is to be applied to the first embodiment of the detection device of metal foreign body of wireless charging system in the embodiment of the present invention
Structure chart；
Fig. 8 is second of the embodiment of detection device of metal foreign body for being applied to wireless charging system in the embodiment of the present invention
Structure chart；
Fig. 9 be in the embodiment of the present invention without metallic foreign body when the voltage waveform that exports.
Figure 10 is the voltage waveform exported when having metallic foreign body 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.
In view of still none reliable detection device of metal foreign body can be gone in detection wireless charging system at present
Minute metallic foreign matter, the embodiment of the present invention provide a kind of detection device of metal foreign body applied to wireless charging system, alternating current
Potential source provides AC analogue voltage, and coil is located at the receiving end in wireless charging system and between transmitting terminal, resistance and coil string
Connection, high frequency peaks detection circuit convert the AC analogue voltage at resistance both ends to the direct current mould that value is AC analogue voltage peak
Quasi- voltage, processor controls warning device display alarm information according to DC simulation voltage, because the embodiment of the present invention is to pass through
Voltage change detects metallic foreign body, so compared with prior art, the present invention can detecte more minute metallic foreign matter, shortens
Detection time avoids security risk in a high temperauture environment.
Fig. 1 is the structure chart in the embodiment of the present invention applied to the detection device of metal foreign body of wireless charging system.Such as Fig. 1
Shown, the detection device of metal foreign body applied to wireless charging system includes: alternating-current voltage source, for providing AC analogue electricity
Pressure；The one or more branches in parallel with alternating-current voltage source, each branch include: one or more concatenated coils, are located at
Between receiving end and transmitting terminal in wireless charging system；With the concatenated resistance of coil；High frequency peaks detection circuit, high frequency peaks
One end of the first input end of detection circuit and resistance connects, the second input terminal of high frequency peaks detection circuit and resistance it is another
End connection, for converting DC simulation voltage for the AC analogue voltage at resistance both ends, the value of DC simulation voltage is exchange
The peak value of analog voltage；Detection device of metal foreign body further include: warning device；It is detected respectively with warning device, each high frequency peaks
The processor of the output end connection of circuit, the DC simulation voltage for being exported according to each high frequency peaks detection circuit, control report
Alarm device exports warning message.
In embodiment, high-frequency small power alternating-current voltage source provides high-frequency ac analog voltage, and multiplex winding is connected in parallel on friendship
On galvanic electricity potential source.There are multiple concatenated coils and a resistance in each branch.When in wireless charging system receiving end with
There are when metallic foreign body between transmitting terminal, since there are eddy current effects, the equivalent impedance of coil can change at this time, Jin Erhui
Change the AC analogue electric current in branch.AC analogue electric current flows through resistance, and the input terminal of high frequency peaks detection circuit can receive
To AC analogue voltage.The AC analogue voltage at resistance both ends is converted DC simulation voltage by high frequency peaks detection circuit, place
It manages device and receives DC simulation voltage from the output end of high frequency peaks detection circuit, controlled and reported according to the changing value of DC simulation voltage
Alarm device exports warning message, and administrative staff learn between receiving end and transmitting terminal in wireless charging system according to warning message
There are metallic foreign bodies, can stop the operation of wireless charging system in time or adjust the power output of wireless charging system, avoid
Metallic foreign body impacts wireless charging system.
Fig. 2 is that alternating current flows through no metallic foreign body coil schematic diagram in the embodiment of the present invention.As shown in Fig. 2, when exchange
Electric currentWhen flowing through the coil of no metallic foreign body, the first magnetic field can be generatedFig. 3 is alternating current stream in the embodiment of the present invention
Cross the equivalent circuit diagram of no metallic foreign body coil.As shown in figure 3, alternating voltageGive first resistor R1With the first equivalent inductance L1
Power supply generates alternating currentWhen metallic foreign body is not present, the first equivalent output impedance of coil is: Z0=R1+jωL1,
Wherein, Z0For the first equivalent output impedance of coil, R1For the first equivalent resistance of coil, ω is the electrical angle of alternating current.
Fig. 4 is that alternating current flows through and has metallic foreign body coil schematic diagram in the embodiment of the present invention.As shown in figure 4, when exchange
Electric currentWhen flowing through the coil for having metallic foreign body, it can be generated due to eddy current effect, in metallic foreign body and the first magnetic fieldReversed
Induced magnetic fieldAnd and alternating currentReversed induced currentFig. 5 is that alternating current flows through in the embodiment of the present invention
There is the equivalent circuit diagram of metallic foreign body coil.As shown in figure 5, when there are metallic foreign body, the second equivalent output impedance of coil
It is:Wherein, Z1For the first equivalent output impedance of coil,
R2For the second equivalent resistance, mutual inductance of the M between coil and metallic foreign body, L2For the second equivalent inductance.When coil is nearby deposited
In metallic foreign body, the equivalent output impedance of coil changes, and then exports the AC analogue electric current of variation.
Fig. 6 is the coil schematic diagram in the embodiment of the present invention.As shown in fig. 6, each coil is respectively positioned on a PCB detection plate
On, form coil matrix.When it is implemented, the radius of coil can be 3cm-4cm, the area of PCB detection plate can be 20cm
× 20cm, 30cm × 30cm or 40cm × 40cm.The area of PCB detection plate is greater than or equal to the reception in wireless charging system
End area, to enable the detection range of detection device of metal foreign body cover the receiving end in wireless charging system.
Fig. 7 is to be applied to the first embodiment of the detection device of metal foreign body of wireless charging system in the embodiment of the present invention
Structure chart.As shown in fig. 7, detection device of metal foreign body can also include: memory connected to the processor, for storing alarm
Threshold values；Processor can be specifically used for: DC simulation voltage being made comparisons with alarming threshold value, controls alarm dress according to comparison result
Set output warning message.In embodiment, processor makes comparisons DC simulation voltage with the alarming threshold value for being stored in memory, when
When DC simulation voltage exceeds alarming threshold value, processor can control warning device output warning message.Wherein, processor can be with
Including analog-digital converter, for DC simulation voltage to be converted to DC digital voltage.Processor can also be by DC digital electricity
Pressure is made comparisons with alarming threshold value, is controlled warning device according to comparison result and is exported warning message.
In embodiment, warning device may include: indicator light and or buzzer；Indicator light is used to export by light and report
Alert information；Buzzer is used to export warning message by sound.When detection device of metal foreign body detects metallic foreign body, high frequency
The DC simulation voltage of peak detection circuit output can exceed alarming threshold value, at this point, indicator light can start to flash, buzzer can be sent out
Auditory tone cues out inform that there are metallic foreign bodies in administrative staff's wireless charging system.
In embodiment, the detection device of metal foreign body applied to wireless charging system can also include: to be connected to high frequency peak
The filtering and amplifying circuit being worth between detection circuit and processor, the DC simulation voltage for being exported to high frequency peaks detection circuit
Filtering processing is amplified, then by the DC simulation voltage output by amplification filtering processing to processor.
Fig. 8 is second of the embodiment of detection device of metal foreign body for being applied to wireless charging system in the embodiment of the present invention
Structure chart.As shown in figure 8, the detection device of metal foreign body of wireless charging system can also include: communication connected to the processor
Equipment, for sending warning message to external equipment.Wherein, the communication interface of communication equipment can connect for GPRS interface, bluetooth
Mouth, CAN interface or WIF interface.External equipment includes computer, smart phone, palm PC (PDA, Personal
Digital Assistant) etc. intelligent apparatus, can be located at Central Control Room, can also be carried by administrative staff.
Fig. 9 be in the embodiment of the present invention without metallic foreign body when the voltage waveform that exports.By the defeated of high frequency peaks detection circuit
Outlet accesses oscillograph, as shown in figure 9, the voltage value of oscilloscope display is 7.3V at this time.Figure 10 is that have in the embodiment of the present invention
The voltage waveform exported when metallic foreign body.When 1 yuan of coin is put between the receiving end and transmitting terminal in wireless charging system,
As shown in Figure 10, the voltage value of oscilloscope display is 7.7V at this time, and voltage significant change 0.4V illustrates to deposit in wireless charging system
In metallic foreign body.
In embodiment, the processor of detection device of metal foreign body can be the processor in wireless charging system, control nothing
The operation of line charge electric system.When detecting metallic foreign body, on the one hand control warning device exports warning message, another party to processor
Face cuts off the operation circuit of wireless charging system, and wireless charging system is out of service at this time or adjusts the power of wireless charging system
Output, can reduce influence of the metallic foreign body to wireless charging system in time.
To sum up, the detection device of metal foreign body applied to wireless charging system of the invention, alternating-current voltage source provide exchange
Analog voltage, coil are located at the receiving end in wireless charging system and between transmitting terminals, and resistance is connected with coil, high frequency peaks inspection
Slowdown monitoring circuit converts the AC analogue voltage at resistance both ends to the DC simulation voltage that value is AC analogue voltage peak, processor
Warning device display alarm information is controlled according to DC simulation voltage.Because the embodiment of the present invention is detected by voltage change
Metallic foreign body shortens detection time, avoids so compared with prior art, the present invention can detecte more minute metallic foreign matter
Security risk in a high temperauture environment.The present invention can also control wireless charging in wireless charging system there are when metallic foreign body
Electric system is out of service or adjusts the power output of wireless charging system, reduces metallic foreign body in time to the shadow of wireless charging system
It rings.
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 (8)
1. a kind of detection device of metal foreign body applied to wireless charging system characterized by comprising
Alternating-current voltage source, for providing AC analogue voltage；
The one or more branches in parallel with the alternating-current voltage source, each branch include:
One or more concatenated coils, between the receiving end and transmitting terminal in wireless charging system；
With the concatenated resistance of coil；
The first input end of high frequency peaks detection circuit, the high frequency peaks detection circuit is connect with one end of the resistance, institute
The second input terminal for stating high frequency peaks detection circuit is connect with the other end of the resistance, for by the exchange at the resistance both ends
Analog voltage is converted into DC simulation voltage, and the value of DC simulation voltage is the peak value of AC analogue voltage；
The detection device of metal foreign body further include: warning device；Respectively with warning device, each high frequency peaks detection circuit it is defeated
The processor of outlet connection, the DC simulation voltage for being exported according to each high frequency peaks detection circuit control the alarm dress
Set output warning message.
2. the detection device of metal foreign body according to claim 1 applied to wireless charging system, which is characterized in that
Each coil is respectively positioned in a PCB detection plate；
The area of the PCB detection plate is greater than or equal to the reception end area in the wireless charging system.
3. the detection device of metal foreign body according to claim 1 applied to wireless charging system, which is characterized in that
The radius of each coil is 3cm-4cm.
4. the detection device of metal foreign body according to claim 1 applied to wireless charging system, which is characterized in that also wrap
It includes:
The memory being connected to the processor, for storing alarming threshold value；
The processor is specifically used for: the DC simulation voltage being made comparisons with alarming threshold value, controls institute according to comparison result
State warning device output warning message.
5. the detection device of metal foreign body according to claim 1 applied to wireless charging system, which is characterized in that
The processor further include: analog-digital converter, for the DC simulation voltage to be converted to DC digital voltage.
6. the detection device of metal foreign body according to claim 1 applied to wireless charging system, which is characterized in that
The warning device include: indicator light and or buzzer；
Indicator light is used to export warning message by light；
Buzzer is used to export warning message by sound.
7. the detection device of metal foreign body according to claim 1 applied to wireless charging system, which is characterized in that also wrap
It includes:
The communication equipment being connected to the processor, for sending the warning message to external equipment.
8. the detection device of metal foreign body according to claim 7 applied to wireless charging system, which is characterized in that
The communication interface of the communication equipment is GPRS interface, blue tooth interface, CAN interface or WIF interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710507552.5A CN109143385A (en) | 2017-06-28 | 2017-06-28 | Detection device of metal foreign body applied to wireless charging system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710507552.5A CN109143385A (en) | 2017-06-28 | 2017-06-28 | Detection device of metal foreign body applied to wireless charging system |
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| CN201710507552.5A Pending CN109143385A (en) | 2017-06-28 | 2017-06-28 | Detection device of metal foreign body applied to wireless charging system |
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Cited By (5)
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| CN109828309A (en) * | 2019-03-13 | 2019-05-31 | 清华大学 | Detection device of metal foreign body, wireless charging system and method |
| CN110277836A (en) * | 2019-05-23 | 2019-09-24 | 新纳传感系统有限公司 | Wireless power transmitter and wireless power transmission system |
| CN111917196A (en) * | 2020-07-09 | 2020-11-10 | 中国电力科学研究院有限公司 | Wireless charging foreign matter detection system, wireless charging system and charging method |
| CN112311108A (en) * | 2019-07-26 | 2021-02-02 | 华为技术有限公司 | Metal foreign matter detection method and device, wireless charging system and electric vehicle |
| CN112863151A (en) * | 2021-01-28 | 2021-05-28 | 大陆汽车电子(长春)有限公司 | Method and system for preventing intelligent key from being damaged by vehicle-mounted wireless charger |
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Application publication date: 20190104 |
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| WD01 | Invention patent application deemed withdrawn after publication |