CN110077247A - Wireless charging foreign matter detection system and detection method based on optical fiber sensing network - Google Patents
Wireless charging foreign matter detection system and detection method based on optical fiber sensing network Download PDFInfo
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- CN110077247A CN110077247A CN201910489302.2A CN201910489302A CN110077247A CN 110077247 A CN110077247 A CN 110077247A CN 201910489302 A CN201910489302 A CN 201910489302A CN 110077247 A CN110077247 A CN 110077247A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 132
- 238000001514 detection method Methods 0.000 title claims abstract description 56
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- 238000000034 method Methods 0.000 claims description 26
- 238000006243 chemical reaction Methods 0.000 claims description 24
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- 239000002184 metal Substances 0.000 claims description 7
- 230000000977 initiatory effect Effects 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 5
- 230000033228 biological regulation Effects 0.000 claims description 4
- 238000007689 inspection Methods 0.000 claims description 4
- 230000036760 body temperature Effects 0.000 claims description 3
- 230000007547 defect Effects 0.000 claims description 3
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- 238000009792 diffusion process Methods 0.000 claims description 2
- 230000004888 barrier function Effects 0.000 claims 1
- 230000008821 health effect Effects 0.000 abstract description 3
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- 238000005452 bending Methods 0.000 description 2
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/10—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
- B60L53/12—Inductive energy transfer
-
- 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
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
-
- 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
- H02J50/30—Circuit arrangements or systems for wireless supply or distribution of electric power using light, e.g. lasers
-
- 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
-
- 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
- H02J50/70—Circuit arrangements or systems for wireless supply or distribution of electric power involving the reduction of electric, magnetic or electromagnetic leakage fields
-
- H02J7/025—
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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
-
- 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
-
- 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
Wireless charging foreign matter detection system and detection method based on optical fiber sensing network, comprising: upper cover plate, optical fiber sensing network plate, transmitting coil, magnetic conduction unit, the first temperature sensor, second temperature sensor, lower cover plate and optical fiber sensing network plate control circuit；The upper cover plate is mounted on the top of the optical fiber sensing network plate, and optical fiber sensing network plate is mounted on above the transmitting coil, and the transmitting coil is mounted on above the magnetic conduction unit, and magnetic conduction unit is mounted on above the lower cover plate；The optical fiber of first temperature sensor and the optical fiber sensing network plate plays point contact；The second temperature sensor is contacted with lower cover plate upper surface；The temperature and strain that the invention passes through detection transmitting coil, to find the system and detection method of foreign matter, it solves the problems, such as to cause high temperature there are metallic foreign body on wireless charging transmitting coil and may cause security risk and living objects foreign matter enters wireless charging working region and the potential health effect that may cause.
Description
Technical field
The present invention relates to electric car wireless charging technical field, the wireless charging for being based especially on optical fiber sensing network is different
Quality testing examining system and detection method.
Background technique
With the aggravation of fossil energy short supply and problem of environmental pollution, develops new-energy automobile and have become the whole world
Common recognition；Wireless charging technology becomes a kind of charging modes of very advantageous due to it has the characteristics that easy, quick, safe；Nothing
Line charge electricity sends electric energy to electric automobile power battery by means of magnetic field coupling, avoids and connects with high-power charging socket
Touching may be implemented with stopping with filling, it might even be possible to which dynamic charges, and greatly improves user experience；
But between the ground launch coil of wireless charging system and the receiving coil for being mounted on bottom of car, there are larger
Air gap, if there is metallic foreign bodies in the energy transmission region, it is possible to can because metal eddy current effect fever and lead
Danger is caused, is likely to result in the risks such as fire under extreme case；If there is the living objects foreign matter such as baby or pet enters charging zone
Domain, it is also possible to cause potential health effect because of exposing to the open air under powerful magnetic field；
Metal class foreign bodies detection mode current at present have increase auxiliary magnetic field coil array, increase aided-detection device with
And the methods of the performance parameter variations of detection system when working, the generally existing poor reliability of these methods, the problems such as limitation is big,
Wrong report, detection system operational failure under high-intensity magnetic field are such as generated when parking is offset, or fail to report metallic foreign body small in size
Deng, however it remains the security risk that the security of the lives and property of people may be damaged；
Such as: a kind of Publication No.: the electric car wireless charging system of integrated auxiliary para function of CN109017426A
System, when carrying out foreign matter or being and detecting, LED light device illuminates body bottom, at the same in camera image information through data
It is sent in host computer and shows after processing unit, auxiliary driver carries out foreign matter and being detection；This method because it is artificial participate in because
Element is easy to produce the biggish error of observation, and causes the increase of task to driver, does not have comfort level, is easy
Generate it is tired out, and the system can only being observation before preliminary observation charging, the being real-time detection in charging process off guard, because
Enter charging work region in charging process, to still remain baby or pet, generates dangerous；
Summary of the invention
In order to solve the above technical problem, the present invention provides a kind of wireless charging foreign bodies detection based on optical fiber sensing network
System and detection method, to find the system and detection method of foreign matter, are solved by detecting the temperature and strain of transmitting coil
There are problems that metallic foreign body causes high temperature on wireless charging transmitting coil and security risk may be caused and living objects are different
Object enters wireless charging working region and the potential health effect that may cause, improves the peace of electric car wireless charging work
Quan Xing.
Wireless charging foreign matter detection system based on optical fiber sensing network, comprising: upper cover plate, optical fiber sensing network plate, hair
Ray circle, magnetic conduction unit, the first temperature sensor, second temperature sensor, lower cover plate and optical fiber sensing network plate control electricity
Road；
Further, the upper cover plate is mounted on the top of the optical fiber sensing network plate, the optical fiber sensing network plate
It is mounted on above the transmitting coil, the transmitting coil is mounted on above the magnetic conduction unit, and the magnetic conduction unit is mounted on
Above the lower cover plate；First temperature sensor is contacted with the optical fiber starting point of the optical fiber sensing network plate；Described
Two temperature sensors are contacted with the lower cover plate upper surface；
Further, one end of wireless charging control unit and one end of the optical fiber sensing network plate control circuit are electrically connected
It connects, the other end of the wireless charging control unit is electrically connected with one end of first temperature sensor；The wireless charging
The another end of control unit is electrically connected with one end of the second temperature sensor, one end again of the wireless charging control unit
It is electrically connected with one end of alarm terminal；
Illustrate as an example, the optical fiber sensing network plate is formed by encased and coiling outside common bare fibre, shield
The effect of set is to prevent from generating breakpoint inside in coiling, and optical fiber can be protected to resist the external strong stress that may apply；
Illustrate as an example, shown referring to Fig.1, the optical fiber sensing network plate is formed using fiber annular coiling,
Center between each circle optical fiber is away from having corresponded to metallic foreign body minimum dimension to be detected；
Illustrate as an example, the minimum dimension can be provided according to concerned countries specification or higher product requirement
Setting；But the diameter of existing fiber is micron level, and minimum detection size is relative to existing foreign material detecting technique centimetre rank
Detection capability have great advantage；
Illustrate as an example, the optical fiber sensing network plate control circuit, can be with far from the setting of work charged area
Avoid electromagnetic radiation bring signal interference.
Further, the optical fiber sensing network plate control circuit includes: laser emitter, fiber amplifier F1, optical fiber
Amplifier F2, filter L1, filter L2, coupler H1, coupler H2, photoelectric converter, A/D conversion circuit, separator, light
Modulator, driving circuit and signal processor；
Further, one end of the laser emitter is connect with one end optical signal of the optical modulator, the light tune
The other end of device processed is electrically connected with one end of the driving circuit, the another end of the optical modulator and the fiber amplifier F1
One end optical signal connection, the other end of the fiber amplifier F1 is connect with one end optical signal of the filter L1, described
The other end of filter L1 is connect with one end optical signal of the coupler H1, the other end and the optical fiber of the coupler H1
The input terminal optical signal of sensing network plate connects, the one end of the input terminal of the optical fiber sensing network plate also with the coupler H2
Optical signal connection, the other end of the coupler H2 connect with one end optical signal of the separator, the separator it is another
End is connect with one end optical signal of the filter L2, one end of the other end of the filter L2 and the fiber amplifier F2
Optical signal connection, the other end of the fiber amplifier F2 are connect with one end optical signal of the photoelectric converter, the photoelectricity
The other end of converter is electrically connected with one end of the A/D conversion circuit, the other end and the signal of the A/D conversion circuit
One end of processor is electrically connected；
Further, the laser emitter is the continuous light (i.e. laser signal) that can produce a specific wavelength, and will
The laser signal is sent to the optical modulator, and modulated laser signal is again amplified signal by fiber amplifier F1, in order to
Inhibit the noise wave interference generated in amplification conversion process, the rear end fiber amplifier F1 increases filter L1, believes according to laser
Number wavelength be filtered operation, then enter coupler H1 after be transferred to the optical fiber sensing network plate, when laser believe
After number entering optical fiber sensing network plate, due to the defect of fiber medium itself or because of internal electric field, magnetic field, sound, pressure, temperature
The physical characteristics such as degree change, and will lead to fiber medium and generate optical heterogeneity or refractive index inhomogeneity, then its
In a part of optical signal can deviate the original direction of propagation, toward all directions diffusion after become scattering light, and therefore generate with
The opposite rear orientation light of incident laser sense；Incident laser continuation continues to propagate in optical fiber along incident direction, until
Transmit out the output end of optical fiber sensing network plate；
Illustrate as an example, the rear orientation light, that is, Brillouin scattering, the frequency phase of the Brillouin scattering
There is certain difference for incident laser signal, that is, produce certain frequency displacement；If the temperature of the certain point in optical fiber or
Strain changes, then the frequency or optical power of Brillouin scattering can occur to change accordingly therewith, and the implementation of this patent is
It is the temperature and dependent variable that design obtains each point being distributed on optical fiber by the frequency displacement and optical power of measurement Brillouin scattering, with this
Detect the real-time variable of foreign matter；The structure design of measurement Brillouin scattering is connected solely to the input of the optical fiber sensing network plate
End can meet；
It introduces as an example, rear orientation light is in addition to Brillouin scattering, and there are also other several forms, it may have logical
A possibility that these scattering light obtain the temperature, dependent variable and position for each point being distributed on optical fiber is crossed, this patent is dissipated with Brillouin
It penetrates for light, but is not precluded using this patent method, a possibility that by measuring other scattering light, completing foreign bodies detection；
Further, the rear orientation light returned from optical fiber sensing network plate enters back into the separation after coupler H2
Device, separator is separated the optical signal for meeting Brillouin scattering frequency range with other scattering light by its internal grating, using filter
It after wave device H2 filters out noise, is sent in fiber amplifier F2 and optical signal is amplified, described in amplified optical signal entrance
Photoelectric conversion is carried out in photoelectric converter, can convert optical signals to electric signal and amplify be converted to analog signal, after conversion
Analog signal is reconverted into digital signal using A/D conversion circuit, and the digital signal after conversion is sent into signal processor and is parsed
Frequency signal and optical power, and frequency shift amount is calculated according to the frequency with incident laser；
The reason of illustrating as an example, generating medium inhomogeneities has very much, wherein due to fiber medium intramolecular
Portion causes spontaneous a sound field and acoustic wavefield there is the vibration of continuous elastic mechanics is formed by because of its spontaneous warm-up movement,
Thus leading to the refractive index of medium can change with space periodicity at any time.
Illustrate as an example, the continuous light of the specific wavelength are as follows: the optical signal of 1550nm；
Illustrate as an example, the photoelectric converter uses photoelectric diode structure；
Design principle in order to better illustrate the present invention, the knowledge for now introducing Brillouin scattering are as follows:
The frequency shift amount and linear relationship of Brillouin scattering, can be linearly increasing with the rising of temperature and fibre strain；
Illustrate as an example, when optical fiber sensing network plate uses general single mode fiber, and incident light wave is a length of
When 1550nm, the temperature coefficient of Brillouin shift can simplify into about 1.18MHz/ DEG C, and the Brillouin shift coefficient of stress can
To be simplified to about 493MHz/%；And optical power can be linearly increasing with the rising of temperature, increases and linear decline with strain；
Illustrate as an example, when sensor fibre network board uses general single mode fiber, and incident light wave is a length of
When 1550nm, the variation of Brillouin scattering optical power and temperature and the mathematical relationship of stress are respectively as follows: (0.36+0.06) %/K
With-(7.7+1.4) * 10-4%/μ ε；
The frequency displacement of the Brillouin scattering parsed and optical power data are sent to wireless charging master controller and according to above-mentioned
Two kinds of mathematical relationships can calculate the temperature variable value Δ t relative to incident light position；When being mounted with first in incident light position
Temperature sensor, if its temperature is t1, then the temperature value of sensing network measurement point is Δ t+t1.Above two mathematical relationship
The strain variation amount Δ ε of sensing network measurement point can be calculated；
Illustrate as an example, the strain variation amount Δ ε may be the strain variation amount based on pressure value；
Illustrate as an example, obtains temperature and measurement frequency displacement or the one such side of optical power can be used in dependent variable
Formula can also be compared to each other using two ways simultaneously, exclude error；
The laser signal that incident laser signal and photoelectric converter receive is issued by record optical fiber sensing network plate
Time can be along the position of fiber orientation measurement point；Due to from laser signal (also known as pulsed light) is issued to receiving pulsed light
Time needed for the Brillouin scattering generated at certain position in a fiber is equivalent to light wave from transmitting terminal to the position toward back pass
It has broadcast once, therefore distance L of the position far from starting point can be obtained are as follows: L=Ct/2n, wherein C is the propagation speed of light in a vacuum
Degree, C=3.0 × 108M/s, t are from pulsed light is issued to when receiving needed for the Brillouin scattering light pulse that certain position generates
Between, n is the refractive index of optical fiber, n=1.46；
The detection method of wireless charging foreign matter detection system based on optical fiber sensing network, comprising:
Step 1: there is air gaps for the transmitting coil and receiving coil of wireless charging system for electric automobile, if in coil
Between energy area in there is metallic foreign body and may cause the raising of temperature because of eddy current effect, heat can pass through transmitting
The upper cover plate of coil is transmitted on subsequent optical fiber sensing network plate；
Step 2: working as wireless charging system for electric automobile advanced row metal inspection of foreign substance before charge initiation, i.e., pass first
A small-power energy is sent, to motivate a magnetic field between the transmitting coil and receiving coil, when passing through the light
When the temperature that fine sensing network plate measures some region on transmitting coil is more than a setting value, system stops small-power energy
Transmission, and the process for stopping starting wireless charging is simultaneously emitted by alarm signal；
Step 3: if wireless charging system for electric automobile starts to want by the charging of automobile when step 2 foreign bodies detection is normal
Transmitting energy is sought, but the optical fiber sensing network of foreign bodies detection continues working；
In charging process, there is foreign matter to abruptly enter charging work region, optical fiber sensing network plate real-time measurement can be passed through
The temperature in some region is more than setting value on to transmitting coil, and wireless charging system for electric automobile stops wireless charging and issues report
Alert signal；
Step 4: when electric car wireless charging, the transmitting coil as lower part permeability magnetic material magnetic saturation etc.
Reason and the raising for causing transmitting coil internal temperature, below the subsequent magnetic conduction unit of transmitting coil, under transmitting coil
The upper surface of cover board is mounted with second temperature sensor, and magnetic conduction element failure or other reasons when transmitting coil lead to emission lines
Internal heat is enclosed to increase, when high temperature is transferred to the optical fiber sensing network plate and lower cover plate, optical fiber sensing network plate and the second temperature
The measured temperature of degree sensor may be above setting value, and system stops wireless charging at this time, and in terminal alarms index line
Enclose overtemperature failure；
When second sensor measurement temperature in the normal range, and the measured temperature of optical fiber sensing network plate is more than
Setting value, system also stops wireless charging, and is alarmed by alarm terminal, and indicates that foreign matter protects failure, while showing foreign matter
Position on coil；
Illustrating as an example, the alarm terminal can be what wireless charging system for electric automobile itself was configured,
It can also be shown in the terminals such as mobile phone, the console of automobile or remote monitoring system；
Illustrating as an example, desired temperature is determined according to concerned countries specification or higher product requirement, with
Metallic foreign body heating temperature does not cause burning to consider to be main in safe range, while coil inside normal working temperature is also answered
No more than this temperature value, such as works as metallic foreign body temperature and be increased to 90 DEG C, will transmit through cover board and be transmitted on optical fiber sensing network
Temperature is as setting value；
Step 5: if wireless charging system for electric automobile before charge initiation and charging process in, the transmitting coil
When entering the living objects such as pet or baby in the energy transmission region between receiving coil, when living objects touch the transmitting
When coil, strain can be generated on the optical fiber sensing network plate due to pressure of itself, and the region that these strains occur can
Energy can be mobile with certain speed；Some regions are detected when fiber optic network is in wireless charging start-up check or in charging process
Strain variation amount Δ ε when being more than setting value, stop or do not start wireless charging, and police instruction foreign matter protects failure, simultaneously
Show position of the foreign matter on coil；
Illustrate as an example, the setting value of variation delta ε is according to concerned countries specification or higher product requirement pair
The regulation of living objects foreign matter determines, as using the object of 3kg to dependent variable produced by optical fiber sensing network as setting value.
The utility model has the advantages that
Optical fiber have it is small in size, light-weight, can flexible bending, electrical insulating property be good, corrosion-resistant, measurement range is big, sensitivity
The features such as high, also has the characteristics that response fast, bandwidth, explosion-proof, anti-flaming；
Light wave does not generate electromagnetic interference, can also work under electromagnetic interference environment, and when work is lost extremely low；
Temperature and strain at where capable of continuously being measured along optical fiber using fiber optic network, can have in this way
Effect detection metallic foreign body fever and the intrusion of living objects foreign matter can solve current by increasing the electromagnetic detections sides such as ancillary coil
The integrity problem that method works under high-intensity magnetic field is the ideal of electric car wireless charging foreign bodies detection and living objects foreign bodies detection
Solution.
Detailed description of the invention
Fig. 1 is the overall structure diagram of the wireless charging foreign matter detection system the present invention is based on optical fiber sensing network
Fig. 2 is the optical fiber sensing network plate control of the wireless charging foreign matter detection system the present invention is based on optical fiber sensing network
Circuit theory schematic diagram
Specific embodiment
In the following, with reference to figures 1 through shown in Fig. 2, the wireless charging foreign matter detection system based on optical fiber sensing network, comprising:
Upper cover plate 101, optical fiber sensing network plate 102, transmitting coil 103, magnetic conduction unit 104, first the 201, second temperature of temperature sensor
Spend sensor 202, lower cover plate 105 and optical fiber sensing network plate control circuit 204；
Further, the upper cover plate 101 is mounted on the top of the optical fiber sensing network plate 102, the Fibre Optical Sensor
Network board 102 is mounted on 103 top of transmitting coil, and the transmitting coil 103 is mounted on 104 top of magnetic conduction unit,
The magnetic conduction unit 104 is mounted on 105 top of lower cover plate；First temperature sensor 201 and the optical fiber sensor network
The optical fiber of network plate 102 plays point contact；The second temperature sensor 202 is contacted with 105 upper surface of lower cover plate；
Further, one end of wireless charging control unit 203 and the one of the optical fiber sensing network plate control circuit 204
End electrical connection, the other end of the wireless charging control unit 203 are electrically connected with one end of first temperature sensor 201；
The another end of the wireless charging control unit 203 is electrically connected with one end of the second temperature sensor 202, the wireless charging
One end again of electric control unit 203 is electrically connected with one end of alarm terminal 205；
Illustrating as an example, the optical fiber sensing network plate 102 is formed by encased and coiling outside common bare fibre,
The effect of sheath is to prevent from generating breakpoint inside in coiling, and optical fiber can be protected to resist the external strong stress that may apply；
Illustrate as an example, referring to Fig.1 shown in, the optical fiber sensing network plate 102 using fiber annular coiling and
At, center between each circle optical fiber away from having corresponded to metallic foreign body minimum dimension to be detected；
Illustrate as an example, the minimum dimension can be provided according to concerned countries specification or higher product requirement
Setting；But the diameter of existing fiber is micron level, and minimum detection size is relative to existing foreign material detecting technique centimetre rank
Detection capability have great advantage；
Illustrate as an example, the optical fiber sensing network plate control circuit, can be with far from the setting of work charged area
Avoid electromagnetic radiation bring signal interference.
Further, the optical fiber sensing network plate control circuit 204 includes: laser emitter 206, fiber amplifier
F1, fiber amplifier F2, filter L1, filter L2, coupler H1, coupler H2, photoelectric converter 207, A/D conversion circuit
208, separator 209, optical modulator 210, driving circuit 211 and signal processor 212；
Further, one end of the laser emitter is connect with one end optical signal of the optical modulator, the light tune
The other end of device processed is electrically connected with one end of the driving circuit, the another end of the optical modulator and the fiber amplifier F1
One end optical signal connection, the other end of the fiber amplifier F1 is connect with one end optical signal of the filter L1, described
The other end of filter L1 is connect with one end optical signal of the coupler H1, the other end and the optical fiber of the coupler H1
The input terminal optical signal of sensing network plate connects, the one end of the input terminal of the optical fiber sensing network plate also with the coupler H2
Optical signal connection, the other end of the coupler H2 connect with one end optical signal of the separator, the separator it is another
End is connect with one end optical signal of the filter L2, one end of the other end of the filter L2 and the fiber amplifier F2
Optical signal connection, the other end of the fiber amplifier F2 are connect with one end optical signal of the photoelectric converter, the photoelectricity
The other end of converter is electrically connected with one end of the A/D conversion circuit, the other end and the signal of the A/D conversion circuit
One end of processor is electrically connected；
Further, the laser emitter 206 is the continuous light (i.e. laser signal) that can produce a specific wavelength, and
The laser signal is sent to the optical modulator 210, modulated laser signal is again amplified signal by fiber amplifier F1,
In order to inhibit to amplify the noise wave interference generated in conversion process, the rear end fiber amplifier F1 increases filter L1, according to sharp
The wavelength of optical signal is filtered operation, is transferred to the optical fiber sensing network plate 102 after then entering coupler H1, when
After laser signal enters optical fiber sensing network plate 102, due to the defect or because internal electric field, magnetic field, sound of fiber medium itself
The physical characteristics such as sound, pressure, temperature change, and will lead to fiber medium and generate the uneven of optical heterogeneity or refractive index
Property, then a part of optical signal therein can deviate the original direction of propagation, and become after being spread toward all directions and scatters light, and because
This generates the rear orientation light opposite with incident laser sense；Incident laser continues in optical fiber along incident direction after resuming
It broadcasts, until transmitting out the output end of optical fiber sensing network plate；
Illustrate as an example, the rear orientation light, that is, Brillouin scattering, the frequency phase of the Brillouin scattering
There is certain difference for incident laser signal, that is, produce certain frequency displacement；If the temperature of the certain point in optical fiber or
Strain changes, then the frequency or optical power of Brillouin scattering can occur to change accordingly therewith, and the implementation of this patent is
It is the temperature and dependent variable that design obtains each point being distributed on optical fiber by the frequency displacement and optical power of measurement Brillouin scattering, with this
Detect the real-time variable of foreign matter；The structure design of measurement Brillouin scattering is connected solely to the input of the optical fiber sensing network plate
End can meet；
It introduces as an example, rear orientation light is in addition to Brillouin scattering, and there are also other several forms, it may have logical
A possibility that these scattering light obtain the temperature, dependent variable and position for each point being distributed on optical fiber is crossed, this patent is dissipated with Brillouin
It penetrates for light, but is not precluded using this patent method, a possibility that by measuring other scattering light, completing foreign bodies detection；
Further, the rear orientation light returned from optical fiber sensing network plate 102 enters back into described point after coupler H2
From device 209, the separator 209 will meet the optical signal and other scattering light point of Brillouin scattering frequency range by its internal grating
From, after filtering out noise using filter H2, it is sent in fiber amplifier F2 and optical signal is amplified, amplified light letter
Number enter the photoelectric converter 207 in carry out photoelectric conversion, can convert optical signals to electric signal and amplify be converted to simulation
Signal, the analog signal after conversion are reconverted into digital signal using A/D conversion circuit 208, and the digital signal after conversion is sent into
Signal processor 212 parses frequency signal and optical power, and calculates frequency shift amount according to the frequency with incident laser；
The reason of illustrating as an example, generating medium inhomogeneities has very much, wherein due to fiber medium intramolecular
Portion causes spontaneous a sound field and acoustic wavefield there is the vibration of continuous elastic mechanics is formed by because of its spontaneous warm-up movement,
Thus leading to the refractive index of medium can change with space periodicity at any time.
Illustrate as an example, the continuous light of the specific wavelength are as follows: the optical signal of 1550nm；
Illustrate as an example, the photoelectric converter 207 uses photoelectric diode structure；
Design principle in order to better illustrate the present invention, the knowledge for now introducing Brillouin scattering are as follows:
The frequency shift amount and linear relationship of Brillouin scattering, can be linearly increasing with the rising of temperature and fibre strain；
Illustrate as an example, when optical fiber sensing network plate 102 uses general single mode fiber, and incident light wave is a length of
When 1550nm, the temperature coefficient of Brillouin shift can simplify into about 1.18MHz/ DEG C, and the Brillouin shift coefficient of stress can
To be simplified to about 493MHz/%；And optical power can be linearly increasing with the rising of temperature, increases and linear decline with strain；
Illustrate as an example, when sensor fibre network board 102 uses general single mode fiber, and incident light wave is a length of
When 1550nm, the variation of Brillouin scattering optical power and temperature and the mathematical relationship of stress are respectively as follows: (0.36+0.06) %/K
With-(7.7+1.4) * 10-4%/μ ε；
The frequency displacement of the Brillouin scattering parsed and optical power data are sent to wireless charging master controller and according to above-mentioned
Two kinds of mathematical relationships can calculate the temperature variable value Δ t relative to incident light position；When being mounted with first in incident light position
Temperature sensor, if its temperature is t1, then the temperature value of sensing network measurement point is Δ t+t1.Above two mathematical relationship
The strain variation amount Δ ε of sensing network measurement point can be calculated；
Illustrate as an example, the strain variation amount Δ ε may be the strain variation amount based on pressure value；
Illustrate as an example, obtains temperature and measurement frequency displacement or the one such side of optical power can be used in dependent variable
Formula can also be compared to each other using two ways simultaneously, exclude error；
The laser letter that incident laser signal and photoelectric converter receive is issued by recording optical fiber sensing network plate 102
Number time can be along the position of fiber orientation measurement point；Due to from laser signal (also known as pulsed light) is issued to receiving pulse
It is round-trip from transmitting terminal to the position that time needed for the Brillouin scattering that light generates at certain position in a fiber is equivalent to light wave
It has propagated once, therefore distance L of the position far from starting point can be obtained are as follows: L=Ct/2n, wherein C is the propagation of light in a vacuum
Speed, C=3.0 × 108M/s, t are needed for from sending pulsed light to the Brillouin scattering light pulse for receiving the generation of certain position
Time, n are the refractive index of optical fiber, n=1.46；
The detection method of wireless charging foreign matter detection system based on optical fiber sensing network, comprising:
Step 1: there is air gaps for the transmitting coil 103 and receiving coil of wireless charging system for electric automobile, if online
The raising of temperature may be caused because of eddy current effect by occurring metallic foreign body in energy area between circle, and heat can pass through hair
The upper cover plate 101 of ray circle 103 is transmitted on subsequent optical fiber sensing network plate 102；
Step 2: working as wireless charging system for electric automobile advanced row metal inspection of foreign substance before charge initiation, i.e., pass first
A small-power energy is sent, so that a magnetic field is motivated between the transmitting coil 103 and receiving coil, when by described
When the temperature that optical fiber sensing network plate 102 measures some region on transmitting coil 103 is more than a setting value, system stops small
Power energy transmission, and the process for stopping starting wireless charging is simultaneously emitted by alarm signal；
Step 3: if wireless charging system for electric automobile starts to want by the charging of automobile when step 2 foreign bodies detection is normal
Transmitting energy is sought, but the optical fiber sensing network plate of foreign bodies detection continues working；
In charging process, there is foreign matter to abruptly enter charging work region, optical fiber sensing network plate real-time measurement can be passed through
The temperature in some region is more than setting value on to transmitting coil, and wireless charging system for electric automobile stops wireless charging and issues report
Alert signal；
Step 4: when electric car wireless charging, the transmitting coil 103 as lower part permeability magnetic material magnetic saturation
Etc. reasons and cause the raising of 103 internal temperature of transmitting coil, below the subsequent magnetic conduction unit 104 of the transmitting coil 103,
The upper surface of lower cover plate 105 is mounted with second temperature sensor 202, when the failure of magnetic conduction unit 104 of transmitting coil 103 or other originals
Cause causes 103 internal heat of transmitting coil to increase, when high temperature is transferred to the optical fiber sensing network plate 102 and lower cover plate 105,
Optical fiber sensing network plate 102 and the measured temperature of second temperature sensor 202 may be above setting value, at this time electric car
Wireless charging system stops wireless charging, and indicates coil overtemperature failure in terminal alarms；
When the temperature that second sensor 202 measures in the normal range, and the measured temperature of optical fiber sensing network plate is super
Setting value is crossed, system also stops wireless charging, and alarms by alarm terminal, and indicates that foreign matter protects failure, shows simultaneously
Position of the foreign matter on coil；
Illustrate as an example, the alarm terminal 205 can be wireless charging system for electric automobile itself and be configured
, it can also be shown in the terminals such as mobile phone, the console of automobile or remote monitoring system；
Illustrating as an example, desired temperature is determined according to concerned countries specification or higher product requirement, with
Metallic foreign body heating temperature does not cause burning to consider to be main in safe range, while coil inside normal working temperature is also answered
No more than this temperature value, such as works as metallic foreign body temperature and be increased to 90 DEG C, will transmit through cover board and be transmitted on optical fiber sensing network
Temperature is as setting value；
Step 5: if wireless charging system for electric automobile before charge initiation and charging process in, the transmitting coil
When entering the living objects such as pet or baby in the energy transmission region between 103 and receiving coil, when living objects touch it is described
When transmitting coil 103, strain can be generated on the optical fiber sensing network plate 102 due to the pressure of itself, and these occur and answers
It the region of change may be mobile with certain speed；It is detected when fiber optic network is in wireless charging start-up check or in charging process
When being more than setting value to the strain variation amount Δ ε of some regions, stops or do not start wireless charging, and police instruction foreign matter is protected
Failure, while showing position of the foreign matter on coil；
Illustrate as an example, the setting value of variation delta ε is according to concerned countries specification or higher product requirement pair
The regulation of living objects foreign matter determines, as using the object of 3kg to dependent variable produced by optical fiber sensing network as setting value.
Optical fiber have it is small in size, light-weight, can flexible bending, electrical insulating property be good, corrosion-resistant, measurement range is big, sensitivity
The features such as high, also has the characteristics that response fast, bandwidth, explosion-proof, anti-flaming；Light wave does not generate electromagnetic interference, can also be in electromagnetism
It works under interference environment, when work is lost extremely low；The temperature located where capable of continuously being measured along optical fiber using fiber optic network with
Strain can effectively detect metallic foreign body fever and the intrusion of living objects foreign matter in this way, can solve current pass through
Increase the integrity problem that the electromechanical detection methods such as ancillary coil work under high-intensity magnetic field, is the inspection of electric car wireless charging foreign matter
Survey the ideal solution with living objects foreign bodies detection.
Disclosed above is only the specific embodiment of the application, and however, this application is not limited to this, any this field
Technical staff can think variation, should all fall in the protection domain of the application.
Claims (10)
1. the wireless charging foreign matter detection system based on optical fiber sensing network characterized by comprising upper cover plate, Fibre Optical Sensor
Network board, transmitting coil, magnetic conduction unit, the first temperature sensor, second temperature sensor, lower cover plate and optical fiber sensing network
Plate control circuit；
The upper cover plate is mounted on the top of the optical fiber sensing network plate, and the optical fiber sensing network plate is mounted on the transmitting
Above coil, the transmitting coil is mounted on above the magnetic conduction unit, and the magnetic conduction unit is mounted on above the lower cover plate；
The optical fiber of first temperature sensor and the optical fiber sensing network plate plays point contact；The second temperature sensor with it is described
The contact of lower cover plate upper surface；
One end of wireless charging control unit is electrically connected with one end of the optical fiber sensing network plate control circuit, the wireless charging
The other end of electric control unit is electrically connected with one end of first temperature sensor；The wireless charging control unit it is another
End is electrically connected with one end of the second temperature sensor, and the one of one end again of the wireless charging control unit and alarm terminal
End electrical connection；
The optical fiber sensing network plate control circuit includes: laser emitter, fiber amplifier F1, fiber amplifier F2, filtering
Device L1, filter L2, coupler H1, coupler H2, photoelectric converter, A/D conversion circuit, separator, optical modulator, driving electricity
Road and signal processor；
One end of the laser emitter is connect with one end optical signal of the optical modulator, the other end of the optical modulator with
One end of the driving circuit is electrically connected, and one end optical signal of the another end of the optical modulator and the fiber amplifier F1 connect
It connects, the other end of the fiber amplifier F1 is connect with one end optical signal of the filter L1, and the filter L1's is another
End is connect with one end optical signal of the coupler H1, and the other end of the coupler H1 is defeated with the optical fiber sensing network plate
Enter optical signal is held to connect, the input terminal of the optical fiber sensing network plate is also connect with one end optical signal of the coupler H2, institute
The other end for stating coupler H2 is connect with one end optical signal of the separator, the other end of the separator and the filter
One end optical signal of L2 connects, and the other end of the filter L2 is connect with one end optical signal of the fiber amplifier F2, institute
The other end for stating fiber amplifier F2 is connect with one end optical signal of the photoelectric converter, the other end of the photoelectric converter
It is electrically connected with one end of the A/D conversion circuit, the other end of the A/D conversion circuit and one end electricity of the signal processor
Connection.
2. the wireless charging foreign matter detection system according to claim 1 based on optical fiber sensing network, which is characterized in that institute
It states optical fiber sensing network plate to be formed by encased and coiling outside common bare fibre, the effect of sheath is to prevent from producing inside in coiling
Raw breakpoint, and optical fiber can be protected to resist the external strong stress that may apply.
3. the wireless charging foreign matter detection system according to claim 2 based on optical fiber sensing network, which is characterized in that institute
It states optical fiber sensing network plate to form using fiber annular coiling, the center between each circle optical fiber is different away from metal to be detected has been corresponded to
Object minimum dimension.
4. the wireless charging foreign matter detection system according to claim 1 based on optical fiber sensing network, which is characterized in that institute
Stating minimum dimension can be arranged according to concerned countries specification or higher product requirement regulation.
5. the wireless charging foreign matter detection system according to claim 1 based on optical fiber sensing network, which is characterized in that institute
Stating laser emitter is that can produce a laser signal, and the laser signal is sent to the optical modulator, modulated to swash
Optical signal is again amplified signal by fiber amplifier F1, in order to inhibit to amplify the noise wave interference generated in conversion process, optical fiber
The rear end amplifier F1 increases filter L1, is filtered operation according to the wavelength of laser signal, then enters coupler
The optical fiber sensing network plate is transferred to after H1, after laser signal enters optical fiber sensing network plate, due to fiber medium itself
Defect or because the physical characteristics such as internal electric field, magnetic field, sound, pressure, temperature change, will lead to fiber medium generation
Optical heterogeneity or refractive index inhomogeneity, then a part of optical signal therein can deviate the original direction of propagation, past
Become scattering light after all directions diffusion, and therefore generates the rear orientation light opposite with incident laser sense.
6. the wireless charging foreign matter detection system according to claim 5 based on optical fiber sensing network, which is characterized in that from
The rear orientation light that optical fiber sensing network plate returns enters back into the separator after coupler H2, and separator passes through inside it
Grating separates the optical signal for meeting Brillouin scattering frequency range with other scattering light, after filtering out noise using filter H2, send
Enter and optical signal is amplified into fiber amplifier F2, amplified optical signal, which enters in the photoelectric converter, carries out photoelectricity
Conversion can convert optical signals to electric signal and amplify be converted to analog signal, and the analog signal after conversion is using A/D conversion electricity
Road is reconverted into digital signal, and the digital signal after conversion is sent into signal processor and parses frequency signal and optical power, and root
Frequency shift amount is calculated according to the frequency with incident laser.
7. the wireless charging foreign matter detection system according to claim 6 based on optical fiber sensing network, which is characterized in that institute
Photoelectric converter is stated using photoelectric diode structure.
8. the detection method of the wireless charging foreign matter detection system based on optical fiber sensing network characterized by comprising
Step 1: there is air gaps for the transmitting coil and receiving coil of wireless charging system for electric automobile, if between coil
Energy area in there is metallic foreign body and may cause the raising of temperature because of eddy current effect, heat can pass through transmitting coil
Upper cover plate be transmitted on subsequent optical fiber sensing network plate；
Step 2: work as wireless charging system for electric automobile advanced row metal inspection of foreign substance before charge initiation, i.e. transmission one first
A small-power energy passes to motivate a magnetic field between the transmitting coil and receiving coil when by the optical fiber
When the temperature that sense network board measures some region on transmitting coil is more than a setting value, system stops small-power energy and passes
It send, and the process for stopping starting wireless charging is simultaneously emitted by alarm signal；
Step 3: if wireless charging system for electric automobile starts to pass by the charging requirement of automobile when step 2 foreign bodies detection is normal
Energy is passed, but the optical fiber sensing network of foreign bodies detection continues working；
In charging process, there is foreign matter to abruptly enter charging work region, optical fiber sensing network plate real-time measurement to hair can be passed through
The temperature in some region is more than setting value on ray circle, and wireless charging system for electric automobile stops wireless charging and issues alarm signal
Number；
Step 4: the transmitting coil is as the reasons such as permeability magnetic material magnetic saturation of lower part when electric car wireless charging
And cause the raising of transmitting coil internal temperature, below the subsequent magnetic conduction unit of transmitting coil, transmitting coil lower cover plate
The upper surface of be mounted with second temperature sensor, magnetic conduction element failure or other reasons when transmitting coil cause in transmitting coil
Portion's heat increases, and when high temperature is transferred to the optical fiber sensing network plate and lower cover plate, optical fiber sensing network plate and second temperature are passed
The measured temperature of sensor may be above setting value, and system stops wireless charging at this time, and super in terminal alarms instruction coil
Reviewing knowledge already acquired barrier；
When second sensor measurement temperature in the normal range, and the measured temperature of optical fiber sensing network plate be more than setting
Value, system also stops wireless charging, and is alarmed by alarm terminal, and indicates that foreign matter protects failure, while showing that foreign matter is online
Position on circle；
Step 5: if wireless charging system for electric automobile the transmitting coil and connects before charge initiation and in charging process
When entering the living objects such as pet or baby in the energy transmission region between take-up circle, when living objects touch the transmitting coil
When, strain can be generated on the optical fiber sensing network plate due to pressure of itself, and the region that these strains occur may
It is mobile with certain speed；Answering for some regions is detected when fiber optic network is in wireless charging start-up check or in charging process
When becoming variation delta ε more than setting value, stop or do not start wireless charging, and police instruction foreign matter protects failure, shows simultaneously
Position of the foreign matter on coil；
Illustrate as an example, the alarm terminal can be what wireless charging system for electric automobile itself was configured, can also
To be shown in the terminals such as the console of mobile phone, automobile or remote monitoring system；
Illustrate as an example, desired temperature is determined according to concerned countries specification or higher product requirement, with metal
Foreign matter heating temperature does not cause burning to consider to be main in safe range, while coil inside normal working temperature also Ying Buchao
This temperature value is crossed, such as works as metallic foreign body temperature and is increased to 90 DEG C, will transmit through the temperature that cover board is transmitted on optical fiber sensing network
As setting value.
9. the detection method of the wireless charging foreign matter detection system according to claim 8 based on optical fiber sensing network,
It is characterized in that, the setting value of the variation delta ε is according to concerned countries specification or higher product requirement to living objects foreign matter
Regulation is to determine.
10. the detection method of the wireless charging foreign matter detection system according to claim 9 based on optical fiber sensing network,
It is characterized in that, the setting value of the variation delta ε is using the object of 3kg to dependent variable produced by optical fiber sensing network as setting
Value.
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