CN109004771A - A kind of wireless charger and foreign matter detecting method - Google Patents
A kind of wireless charger and foreign matter detecting method Download PDFInfo
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- CN109004771A CN109004771A CN201810844960.4A CN201810844960A CN109004771A CN 109004771 A CN109004771 A CN 109004771A CN 201810844960 A CN201810844960 A CN 201810844960A CN 109004771 A CN109004771 A CN 109004771A
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- 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
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Abstract
The present invention provides a kind of wireless charger and foreign matter detecting methods, can be by the calculating to energy transmit coil quality factor, and simplicity accurately identifies Wireless charging coil with the presence or absence of metallic foreign body.The wireless charger, comprising: sequentially connected energy transmitting line and foreign bodies detection circuit, energy transmitting line, including, concatenated alternating source Us, energy transmit coil inductance L, equivalent capacity C and equivalent loss resistance R；Foreign bodies detection circuit, including, sequentially connected conversion module and processing module.
Description
Technical field
The application belongs to wireless charging technical field, and in particular to a kind of wireless charger and foreign matter detecting method.
Background technique
Current many terminal devices (such as mobile phone) all use the mode of wireless charging for terminal charge.That is, wireless charging
Device is provided with energy transmit coil, is provided with corresponding energy receiving coil on charging equipment (such as mobile phone).Energy is sent
Energy is sent to the energy receiving coil on charging equipment by coil, is then converted by the reception device of charging equipment
Required DC power supply, to charge to the lithium battery in equipment.
When terminal device carries out wireless charging, if there are metallic foreign body in Wireless charging coil, changing magnetic field is produced
Raw vortex eventually causes the safety problems such as fire so that the metallic foreign body consumes magnetic field energy and generates heat.
The power loss of detection transmitting terminal is mainly passed through to the metallic foreign body detection of wireless charging device currently on the market
Mode realizes that peripheral circuit is simple, easily calculates, but there are the adjusting of foreign bodies detection sensitivity difficulty, reports by mistake, fails to report etc. and asking
Topic, while when detecting foreign matter only by stopping charging causing user not know current charged state come evasion, it can
It can cause to think such as user in charging but actually there is no charging, cause poor user experience.Cause the above problem
Reason is more complicated, is on the one hand that loss power of the power loss method in inverter bridge and transmitting coil cannot be by directly measuring
Mode obtains, thus the calculating error formed when calculating power loss result in metallic foreign body detection it is not accurate enough；It is another
The threshold value setting of aspect, metallic foreign body alarm power loss will affect the sensitivity of foreign bodies detection, and threshold value is lost in optimal power
Determination difficulty is big in realization, need by largely testing the empirical value come accumulating and enriching；Simultaneously as detection is not quasi- enough
True charging unit is only normal and improper two states, user can not be to current charging none quantitative understanding of environment；
Finally, due to which temperature, the humidity etc. by environment influence, each component of same equipment may also be missed in varying environment
Difference causes to report by mistake.
Summary of the invention
To solve the above-mentioned problems, this application provides a kind of wireless charger and foreign matter detecting methods, on the one hand can be with
Foreign matter is detected by the detection only to energy transmit coil quality, the degree that can be reduced that the device is complicated improves detection accuracy；Another party
Face by digital square-wave can quality factor that are easy, accurately identifying Wireless charging coil, further increase detection accuracy；
Simultaneously as accurately calculating coil quality, it can also be classified according to different coil qualities and indescribably be shown, reduce wrong report,
User experience is promoted, customized setting can also be carried out to prompt information, improve device to the adaptability of environment, further mention
Rise user experience.
To realize that above-mentioned application purpose, the application first aspect disclose a kind of wireless charger.It is characterized in that, packet
It includes: sequentially connected energy transmitting line and foreign bodies detection circuit, the energy transmitting line, including, concatenated alternating source
Us, energy transmit coil inductance L, equivalent capacity C and equivalent loss resistance R；The foreign bodies detection circuit, including, it is sequentially connected
Conversion module and processing module；The input terminal of the conversion module is in parallel with the equivalent capacity C of the energy transmitting line, institute
Conversion module is stated for converting digital square-wave for the oscillatory voltage signals of the equivalent capacity C；The processing module, packet
Processing chip is included, an I/O pin of the processing chip is connect with the output end of the conversion module, and the processing module is used
In the number of cycles of digital square-wave described in recording period T.
Optionally, the conversion module includes: voltage regulation unit, compares converting unit and filter unit.
Optionally, the voltage regulation unit includes a fixed voltage source, first diode and the second diode, described solid
Constant voltage source, first diode and the second diode are sequentially connected in series, second diode and the energy transmitting line etc.
Imitate capacitor C parallel connection, output end of the parallel connection intersection point end as the voltage regulation unit.
Optionally, the relatively converting unit includes: voltage comparator, reference voltage subelement and output subelement；Institute
The first input end for stating voltage comparator is connect with the output end of the voltage regulation unit；Second input terminal of the voltage comparator
It is connect with the reference voltage subelement；The output end of the voltage comparator is connect with the output subelement.
Optionally, the reference voltage subelement includes: first resistor and second resistance, the first resistor and the second electricity
Hinder, the connecting pin of the first resistor and the second resistance and the electricity source-series with the fixed voltage in the voltage regulation unit
Press the second input terminal connection of comparator.
Optionally, the output subelement includes: output resistance, the output of the output resistance and the voltage comparator
End connection.
Optionally, the filter unit includes: filter capacitor, the output of filter capacitor converting unit compared with described
End connection, the I/O pin of the filter capacitor connecting pin of the output end of converting unit and the processing chip compared with described
Connection.
Optionally, the processing module further include: prompting submodule, the prompting submodule are used for according to different coils
The quality factor of inductance L, which are classified, indescribably to be shown, the classification is indescribably shown as the quality factor prompt of different coil inductance L not
Same information, the quality factor of the coil inductance L are directly proportional to the number of cycles.
Optionally, it is described classification you can well imagine is shown as: be classified on the charging device indescribably show and/or by charging unit to
Device is electrically charged to send the other prompt information of classification and/or send the other prompt information of classification, institute to user terminal by charging unit
Stating and being electrically charged device from user terminal is different devices.
Optionally, the whole surface of the shell of charger is provided with thermal dispersant coatings, and the thermal dispersant coatings are as follows
It is process:
By liquor capacity number, by 13~30% silicon dioxide gel, 13~30% graphene oxide dispersion, 40
~75% polystyrene emulsion forms liquid phase coating, and the silicon dioxide gel and graphene oxide dispersion are isometric；
Carrier to be radiated is immersed in the coating, is taken out after 8~10min, take-off time≤10s is dried at room temperature for；In repetition
Operation 3 times is stated, is heat-treated after dry at 300 DEG C to get thermal dispersant coatings；
The silicon dioxide gel the preparation method comprises the following steps: ethyl orthosilicate is added to absolute ethanol, after mixing evenly plus
Entering basic catalyst, the basic catalyst is concentrated ammonia liquor by volume: the mixed solution that sodium fluoride=1:0.2 is uniformly mixed so as to obtain,
12h is stirred at 45 DEG C, adds vinyltriethoxysilane, obtains silicon dioxide gel；Wherein, by volume parts, positive silicic acid
Ethyl ester: dehydrated alcohol: basic catalyst: silane coupling A -151=10:50~120:2~5:1；
The graphene oxide dispersion the preparation method comprises the following steps: by weight, 1 part of graphene oxide is added 20~30 parts and is gone
In ionized water, power 60W is ultrasonically treated 3h to get graphene oxide dispersion；
The polystyrene emulsion the preparation method comprises the following steps: by styrene monomer be added deionized water in, add dehydration mountain
Pears alcohol monoleate polyoxyethylene ether, is sufficiently stirred to form lotion, and gained lotion is passed through nitrogen at 70 DEG C, adds concentration and is
3% ammonium persulfate aqueous solution, polymerization reaction 7h, obtains polystyrene emulsion；Wherein, in parts by weight, it styrene monomer: goes
Ionized water: Tween80: ammonium persulfate aqueous solution=1:3~7:0.05~0.10:0.1~0.3；
Or liquid phase coating presses liquor capacity number, is dispersed by the graphene oxide of 22% silicon dioxide gel, 56%
Liquid, 22% polystyrene emulsion composition.
The application second aspect discloses a kind of wireless charging foreign matter detecting method, and the method is appointed applied to first aspect
In one wireless charger, this method comprises: sending single order step excitation signal e (t) to the alternating source Us；Described in reception
The digital square-wave that the output end of conversion module transmits；The number of cycles of the digital square-wave in recording period T；Root
The quality factor q of the energy transmit coil inductance L is calculated according to the number of cycles；It is less than safety threshold in the quality factor q
In the case where value, judge that there are metallic foreign bodies in wireless charging circuit.
Optionally, the quality factor q of the energy transmit coil inductance L is calculated according to the number of cycles, comprising: pass through
Following formula calculates quality factor q, Q=N π/ln (u1/u2), wherein N is the number of cycles, and the u1 and u2 are respectively
Starting voltage peak and end voltage peak of the conversion module input terminal in period T.
Optionally, according to the difference of Q value, user is classified and is indescribably shown, improve upgrading experience.
The application has the advantages that
The application makes the LC in energy transmitting line by sending a single order step excitation signal to energy transmitting line
Resonance circuit free oscillation decaying, converts digital square-wave for decaying ringing signal by conversion module, then passes through place
Number of cycles N of the I/O mouth detection digital square-wave of chip in period T is managed, energy is calculated according to this number of cycles N
The quality factor q of transmit coil inductance L, finally, quality factor can reduce according to when wireless charger is there are when metallic foreign body
Principle, judge that wireless charger whether there is metallic foreign body at this time, and is classified and is indescribably shown, promote user experience.This
The foreign bodies detection mode of application is lower to the cost requirement of hardware and software, can it is easy, accurately identify wireless charger
It with the presence or absence of metallic foreign body, and is prompted, promotes user experience.And the present invention introduces new technology, from the angle of enhancing heat dissipation
Degree further decreases wireless charging heating, reduces fire, risk of explosion.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of wireless charger disclosed in the present application；
Fig. 2 is the structural schematic diagram of conversion module circuit in Fig. 1 disclosed in the present application；
Fig. 3 is the schematic diagram that oscillatory voltage signals disclosed in the present application are converted into digital square-wave；
Fig. 4 is the schematic diagram of the LC series resonance equivalent circuit of energy sending module disclosed in the present application；
Fig. 5 is a kind of schematic diagram of wireless charging foreign matter detecting method disclosed in the present application；
Fig. 6 is that honeycomb coating of the present invention forms front-end geometry schematic diagram.
Specific embodiment
As shown in FIG. 1, FIG. 1 is a kind of internal circuit configuration schematic diagrames of wireless charger disclosed in the present application.This is wireless
Charger internal circuit structure 10, comprising: sequentially connected energy transmitting line 100 and foreign bodies detection circuit 200,
Energy transmitting line 100, including, it concatenated alternating source Us, energy transmit coil inductance L, equivalent capacity C and waits
Imitate loss resistance R；
Foreign bodies detection circuit 200, including, sequentially connected conversion module 220 and processing module 230；
The input terminal of conversion module 220 is in parallel with the equivalent capacity C of energy transmitting line 100, and conversion module 220 is used for will
The oscillatory voltage signals of equivalent capacity C are converted into digital square-wave；
Processing module 230, including processing chip 231, handle the output of an I/O pin and conversion module 220 of chip
End connection, number of cycles of the processing module 220 for digital square-wave in recording period T.
In this application, charging equipment can be the end products such as mobile phone, tablet computer, smartwatch.It is above-mentioned wireless
Charging foreign bodies detection circuit is set in wireless charger, and wherein energy transmitting line 100 is provided with energy transmit coil, above-mentioned
Corresponding energy receiving coil is provided on charging equipment.The energy transmit coil of energy transmitting line 100 sends energy
To the energy receiving coil on charging equipment, required direct current is then converted by the reception device of charging equipment
Source, to charge to the lithium battery in equipment.
As shown in Fig. 2, Fig. 2 is the structural schematic diagram of conversion module circuit in Fig. 1 disclosed in the present application.Wherein conversion module
220 include: voltage regulation unit 221, compare converting unit 222 and filter unit 223.
Wherein, voltage regulation unit 221 includes a fixed voltage source V, first diode D1 and the second diode D2, this is solid
Constant voltage source V, first diode D1 and the second diode D2 are sequentially connected in series, the second diode D2 and energy transmitting line 220
Equivalent capacity C is in parallel, the output end of the parallel connection intersection point end as voltage regulation unit 221.
Wherein, comparing converting unit 222 includes: voltage comparator B, reference voltage subelement 2221 and output subelement
2222；The first input end of voltage comparator B+connect with the output end of voltage regulation unit 221；Second input of voltage comparator B
It hold-is connect with reference voltage subelement 2221；The output end O of voltage comparator is connect with output subelement 2222.
Wherein, reference voltage subelement 2221 includes: first resistor R1 and second resistance R2, the electricity of first resistor R1 and second
Resistance R2 connects with the fixed voltage source V in voltage regulation unit 221, and the connecting pin of first resistor R1 and second resistance R2 are compared with voltage
The second input terminal-connection of device B.
Wherein, output subelement 2222 includes: output resistance R0, the output end O of output resistance R0 and voltage comparator B
Connection.
Wherein, filter unit 223 includes: filter capacitor CO, the output end of filter capacitor CO converting unit 222 compared with
Connection, filter capacitor CO I/O pin X of the connecting pin of the output end of converting unit 222 and processing chip 231 compared with connect
It connects.
As shown in figure 3, Fig. 3 is the schematic diagram that oscillatory voltage signals disclosed in the present application are converted into digital square-wave.?
In the application, mono- single order step excitation signal e (t) of alternating source Us of energy transmitting line 100, LC oscillating circuit are given
Decaying oscillator signal after voltage comparator B, in period T, the voltage at the both ends equivalent capacity C just decays to u2 from u1,
Wave in figure indicates that voltage attenuation curve, square wave line indicate the digital square-wave after conversion.
As shown in figure 4, Fig. 4 is the schematic diagram of the LC series resonance equivalent circuit of energy transmitting line disclosed in the present application.
Pumping signal is voltage signal e (t) in figure, and e (t) is single order step voltage signal.0 is jumped to just under t=0 moment e (t) is by U0
U (t) can be caused to start the free oscillation that decays, free oscillation formula are as follows:
Solving above-mentioned second order differential equation can obtain:
WhenI.e.When according to primary condition
It solves
Wherein
When it is that Q value is sufficiently large that Equivalent DC impedance R is sufficiently small, ω=ω0I.e.Therefore
It enablesThen
When n is positive integer 0,1,2,3,4 ...
Taking the corresponding crest voltage of any two forward direction peak value point moment t1, t2 is respectively u1, u2
Therefore
Both sides take logarithm that can obtain
N, that is, deamplification number of oscillation in the period T of t1 to t2 in above formula, the i.e. period of digital square-wave
Number.Because the statistics of number of cycles since starting of oscillation voltage to decay to setting fixed voltage terminate in Q value calculation formula
Voltage u1, u2 be known constant.
Further, shown processing module 230 may also include prompting submodule, and the prompting submodule is according to different Q
Value, which is classified, indescribably to be shown.Q value can carry out different stage setting according to user preferences, such as 3,5 or other grades of setting
Not, the present invention is not particularly limited.By taking 3 ranks as an example, judge in wireless charging circuit when Q value is less than or equal to first threshold
There are metallic foreign body, when Q value is greater than first threshold and is less than or equal to second threshold, judge wireless charging circuit in safe range
But there may be exceptions, and user is prompted to check；Q value judges that wireless charging circuit is normal when being greater than second threshold, can trust and fill
Electricity.
To the prompt of user can make charging unit issue different colours light and/or different frequency sound and/or
The vibration of different frequency and/or text prompt are realized.By taking the light prompt of 3 ranks as an example, Q value is less than or equal to first threshold
When judge there are metallic foreign body in wireless charging circuit, charging unit is displayed in red light prompt, Q value greater than first threshold and
When less than or equal to second threshold, wireless charging circuit is judged in safe range but there may be exception, charging unit display is yellow
Colored lights prompt user to check；Q value judges that wireless charging circuit is normal when being greater than second threshold, shows green, prompts to use
Family can trust charging.
It can also wirelessly be given by charging unit to the prompt of user and be electrically charged device and/or user terminal hair
Send prompt information.The wireless mode includes but is not limited to WIFI, bluetooth, cellular radio.The device that is electrically charged includes
But it is not limited to automobile, sweeping robot, portable mobile termianl, for being electrically charged device and be automobile, is charged when automobile reaches
When position, if charging unit detects that foreign matter, charging unit send the prompt information of different stage, vehicle to automobile middle control display screen
Master can determine whether to get off according to prompt information checks charging unit, and user experience so can be improved.The user is whole
End includes but is not limited to mobile phone, portable mobile termianl.To be electrically charged device as sweeping robot, user terminal is user mobile phone
For, when sweeping robot reaches charging unit position, if detecting foreign matter, charging unit sends not at the same level to user mobile phone
Whether other prompt information prompts user normal to sweeping robot position detection charging unit, when sweeping robot is in parlor,
And user can prompt user to check charging unit in time at bedroom, avoid delay charging, promotes user experience.
The prompting submodule can also include setting submodule, and the setting submodule is used to prompt grade to user setting
Other quantity and/or every rank Q value and/or every rank prompting mode.Shown every rank prompting mode includes issuing charging unit
The vibration of the light of different colours and/or different sound and/or different frequency and/or text pass through charging unit with wireless
Mode send prompt information to device and/or user terminal is electrically charged.By the setting of user, can be set in different environment
Different prompting threshold values is set, charging unit can be made to adapt to different environment, even if due to the humidity of current environment, temperature or setting
The reasons such as standby aging cause detection error, and user can also carry out manual adjustment, to improve the accuracy of prompt, avoid reporting by mistake.
As shown in figure 5, Fig. 5 is a kind of schematic diagram of wireless charging foreign matter detecting method disclosed in the present application.The wireless charging
Electric foreign matter detecting method is applied in wireless charger shown in FIG. 1, comprising:
501, single order step excitation signal e (t) is sent to alternating source Us；
502, the digital square-wave that the output end of conversion module transmits is received；
503, in recording period T above-mentioned digital square-wave number of cycles；
504, the quality factor q of energy transmit coil inductance L is calculated according to above-mentioned number of cycles；
505, the prompt of different stage is sent according to above-mentioned quality factor q.
As an alternative embodiment, the quality factor q of energy transmit coil inductance L is calculated according to number of cycles,
It include: to be calculated by the following formula quality factor q,
Wherein, N is number of cycles, and u1 and u2 are respectively starting voltage wave crest of the conversion module input terminal in period T
Peak value and end voltage peak.
In the method, single order step excitation signal e (t) is sent to alternating source Us, then utilizes the I/O of processing chip
The energizing signal frequency n for mouthful interrupting Trigger detection feedback voltage u, calculates in setting time T range (from starting of oscillation t1 to declining
Reduce to fixed comparison voltage t2) the deamplification number of oscillationBecause overturn number statistics from
Starting of oscillation voltage u1 start to decay to set fixed voltage u2 terminate thus voltage u1, u2 in Q value calculation formula as it is known often
Number, therefore can enableFor constant, so Q=KN is
The theory that will lead to the reduction of Q value using metallic foreign body intervention is less than the feelings of secure threshold A in above-mentioned quality factor q
Under condition, judge that there are metallic foreign bodies in wireless charging circuit.
As an alternative embodiment, sending the prompt of different stage according to quality factor q includes following manner:
Q value can carry out different stage setting according to user preferences, such as 3,5 or other ranks of setting, the present invention
It is not particularly limited.By taking 3 ranks as an example, judge that there are metals in wireless charging circuit when Q value is less than or equal to first threshold
Foreign matter judges wireless charging circuit in safe range but may deposit when Q value is greater than first threshold and is less than or equal to second threshold
In exception, user is prompted to check；Q value judges that wireless charging circuit is normal when being greater than second threshold, can trust charging.
To the prompt of user can make charging unit issue different colours light and/or different frequency sound and/or
The vibration of different frequency and/or text prompt are realized.By taking the light prompt of 3 ranks as an example, Q value is less than or equal to first threshold
When judge there are metallic foreign body in wireless charging circuit, charging unit is displayed in red light prompt, Q value greater than first threshold and
When less than or equal to second threshold, wireless charging circuit is judged in safe range but there may be exception, charging unit display is yellow
Colored lights prompt user to check；Q value judges that wireless charging circuit is normal when being greater than second threshold, shows green, prompts to use
Family can trust charging.
It can also wirelessly be given by charging unit to the prompt of user and be electrically charged device and/or user terminal hair
Send prompt information.The wireless mode includes but is not limited to WIFI, bluetooth, cellular radio.The device that is electrically charged includes
But it is not limited to automobile, sweeping robot, portable mobile termianl, for being electrically charged device and be automobile, is charged when automobile reaches
When position, if charging unit detects that foreign matter, charging unit send the prompt information of different stage to automobile middle control display screen.Institute
Stating user terminal includes but is not limited to mobile phone, portable mobile termianl.To be electrically charged device as sweeping robot, the user is whole
End is for user mobile phone, when sweeping robot reaches charging unit position, if detecting foreign matter, charging unit is to user hand
Whether machine sends the prompt information of different stage, prompt user normal to sweeping robot position detection charging unit.
In addition, every rank Q value and/or every rank prompting mode can also be arranged in user.Shown every rank prompting mode packet
It includes the vibration for making the light and/or different sound and/or different frequency of charging unit sending different colours and/or text, lead to
It overcharges electric installation and wirelessly sends prompt information to being electrically charged device and/or user terminal.By the setting of user,
Different prompting threshold values can be set in different environment, and charging unit can be made to adapt to different environment, to improve the standard of prompt
Exactness avoids reporting by mistake.
The specific embodiment of this method is identical as above-mentioned wireless charging foreign bodies detection circuit, is not described herein.
Requirement of the foreign bodies detection mode of the application to hardware cost is lower, increases only the conversion for having comparator
Modular circuit；Requirement to software cost is lower, and system only needs to interrupt Trigger detection by the I/O mouth for handling chip anti-
Feedthrough voltage overturns number of cycles, without other software resources such as analog-to-digital conversions；The foreign bodies detection mode timing of the application is simple, just
In realize and foreign bodies detection accuracy of identification it is higher；Indescribably show in addition, the application can also be classified according to different stage, it can be with
Prompt accuracy is further increased, user experience is promoted.
The another aspect improvement of the application is: at work, the inevasible generation heat of meeting is wireless charging device
The waste heat accumulation for avoiding the equipment from generating in the process of running is to injury device, or even sets off an explosion, the danger such as fire.Using
Waste heat export is common approach by the material with high thermal conductance.Heat-sink unit and extraneous contact area size are to influence
Therefore an important factor for its heat dissipation performance, in the case where not changing equipment crude oil structure, can generally pursue the face of heat-sink unit
Product is the bigger the better.But the material surface of general high thermoconductivity is all smooth hydrophobic state, small with extraneous contact area；Meanwhile
Present electronic product, mechanical equipment are all gradually designed toward light and shortization, and the excessive heat-transfer matcrial of tradition is no longer applicable in.
Therefore, the present invention provides a kind of Heat Conduction Material, which is integrated to charger case in a manner of coating
Surfaces externally and internally, charger internal heat can be transmitted to housing exterior by the thermal dispersant coatings of inner surface of outer cover by thermal dispersant coatings
Heat dissipation spy's layer in face, and be transmitted in ambient enviroment, solve the problems, such as that wireless charging device generates heat.It can play to filling
The better heat dissipation effect of electric appliance.Avoid the risk of the fevers such as battery, chip, aging etc., explosion, burning.
Heat radiation coating/coating of the invention the preparation method is as follows:
1, it prepares silicon dioxide gel: ethyl orthosilicate is added to absolute ethanol, add alkalinity after mixing evenly and urge
Agent, the basic catalyst are concentrated ammonia liquor by volume: the mixed solution that sodium fluoride=1:0.2 is uniformly mixed so as to obtain, and are stirred at 45 DEG C
12h is mixed, adds vinyltriethoxysilane (A-151) to get the silicon dioxide gel with hydrophobic performance；Wherein, it presses
Volume parts, ethyl orthosilicate: dehydrated alcohol: basic catalyst: A-151=10:50~120:2~5:1.
2, it prepares graphene oxide dispersion: the graphene oxide prepared by Hummers method is add to deionized water,
3h (power 60W) is ultrasonically treated to get graphene oxide dispersion；Wherein, in parts by weight, graphene oxide: deionized water
=1:20~30.
3, it prepares polystyrene emulsion: styrene monomer being added in deionized water, anhydrous sorbitol list oleic acid is added
Ester APEO (Tween 80), is sufficiently stirred to form lotion, and gained lotion is passed through nitrogen at 70 DEG C, adds concentration and is
3% ammonium persulfate aqueous solution, polymerization reaction 7h, obtains polystyrene emulsion；Wherein, in parts by weight, it styrene monomer: goes
Ionized water: Tween 80: ammonium persulfate aqueous solution=1:3~7:0.05~0.10:0.1~0.3.
4, above-mentioned silicon dioxide gel, graphene oxide dispersion, polystyrene emulsion are mixed to form coating colloid, it will
Carrier (such as radiator) to be radiated immerses in coating colloidal solution, takes out after 8~10min, take-off time≤10s, to guarantee
The uniformity of coating, is dried at room temperature on carrier；It repeats aforesaid operations 3 times, is heat-treated at 300 DEG C after dry, i.e.,
There must be hydrophilic and hydrophobic hybrid cellular shape heat conducting coating；Wherein, by liquor capacity portion rate, silicon dioxide gel: polystyrene
Lotion: graphene oxide dispersion=13~30%:40~75%:13~30%；And silicon dioxide gel and graphene oxide
Dispersion liquid is isometric.
As shown in fig. 6, Fig. 6 left figure is illustrated are as follows: polystyrene forms bubble, and silica is helped to be formed with graphene oxide
Honeycomb structure；Fig. 6 right figure signal are as follows: after 300 DEG C of heat treatment, polystyrene decomposition leaves honeycomb coating structure, after being
It is continuous that carrier heat conduction and heat radiation is helped to prepare.
It is further illustrated to of the invention combined with specific embodiments below.In addition, using the technical solution system in above range
Standby graphene oxide dispersion prepares heat-conductive coating/coating, and final heating conduction is suitable, therefore does not show preparation in embodiment
The parameter of graphene oxide dispersion.For convenience of operating in following embodiments, it is all made of graphene oxide: deionized water=1:
25。
Comparative example
According to the above method, graphene oxide dispersion, graphene oxide: deionized water=1:25 are prepared.Prepare polyphenyl second
Alkene lotion, styrene monomer: deionized water: Tween 80: ammonium persulfate aqueous solution=1:5:0.07:0.25.Do not add dioxy
SiClx colloidal sol, graphene oxide dispersion: polystyrene emulsion=44%:56%.Pull rate is 10cm/min, and preparation applies
Layer, as a comparison case.
Embodiment one: the preparation parameter of preferred silicon dioxide gel
1,10 groups of silicon dioxide gel according to the above method, are prepared, it is as shown in the table for design parameter.Prepare graphene oxide dispersion
Liquid, graphene oxide: deionized water=1:25.Prepare polystyrene emulsion, styrene monomer: deionized water: Tween 80: mistake
Ammonium sulfate solution=1:5:0.07:0.25.Silicon dioxide gel: polystyrene emulsion: graphene oxide dispersion=22%:
56%:22%.Pull rate 10cm/min, 10 groups of prepares coating.
1 silicon dioxide gel design parameter of table
| Group | Dehydrated alcohol | Basic catalyst |
| Group 1 | 50 | 3 |
| Group 2 | 70 | 3 |
| Group 3 | 90 | 3 |
| Group 4 | 100 | 3 |
| Group 5 | 110 | 3 |
| Group 6 | 120 | 3 |
| Group 7 | 100 | 2 |
| Group 8 | 100 | 4 |
| Group 9 | 100 | 5 |
| Group 10 | 100 | 3 |
2, Determination of conductive coefficients: C-THERM TCI thermal conductivity coefficient measurement instrument is used, test temperature is 20 DEG C, to above-mentioned 10
Group coating carries out Determination of conductive coefficients.The results are shown in Table 2.
2 thermal coefficient of table is shown
3, cold cycling warming and cooling rate is tested: 50% ethylene glycol and 50% water (volume will be passed through inside radiator
Than).The pressure for applying 100kPa ± 20kPa records 10 DEG C to 90 DEG C of each coating material with 10 DEG C to 90 DEG C progress temperature cycles
The time required to temperature-rise period and the time required to 90 DEG C to 10 DEG C temperature-fall periods.The results are shown in Table 3.
3 cold cycling of table goes up and down temp effect and shows
From above-mentioned table 2, table 3 as can be seen that using the silicon dioxide gel prepared in the framework of the present definition, to most
The performance influence difference of whole heat-conductive coating is little, and effect is suitable.
Using pure graphene oxide, thermal coefficient is very high, but in heating and cooling test, the higher pure oxygen of thermal coefficient
The graphite ene coatings heating-up time is substantially less than each group of the present invention, and temperature fall time is significantly higher than each group of the present invention, illustrates that its is thermally conductive
Performance is markedly less than composite coating material prepared by the present invention.
Embodiment two: the preparation parameter of preferred polystyrene emulsion
1,8 groups of polystyrene emulsion are prepared according to the above method, and design parameter is as shown in table 4.By one group 4 of method of embodiment
Prepare 8 groups of silicon dioxide gel；Prepare graphene oxide dispersion, graphene oxide: deionized water=1:25.According to titanium dioxide
Silica solution: polystyrene emulsion: graphene oxide dispersion=22%:56%:22%, pull rate 10cm/min, preparation apply
8 groups of layer.
4 each group design parameter of table
| Group | Deionized water | Tween 80 | Ammonium persulfate aqueous solution |
| Group 1 | 3 | 0.07 | 0.25 |
| Group 2 | 5 | 0.07 | 0.25 |
| Group 3 | 7 | 0.07 | 0.25 |
| Group 4 | 5 | 0.05 | 0.25 |
| Group 5 | 5 | 0.10 | 0.25 |
| Group 6 | 5 | 0.07 | 0.10 |
| Group 7 | 5 | 0.07 | 0.20 |
| Group 8 | 5 | 0.07 | 0.30 |
2, thermal coefficient is tested by the method for embodiment one, the results are shown in Table 5.
5 thermal coefficient of table is shown
3, by the method test lifting temp effect of embodiment one, the results are shown in Table 6.
6 cold cycling of table goes up and down temp effect and shows
| Group | Heating-up time (min) | Temperature fall time (min) |
| Group 1 | 15.2 | 5.5 |
| Group 2 | 15.4 | 5.4 |
| Group 3 | 15.3 | 5.5 |
| Group 4 | 15.0 | 5.6 |
| Group 5 | 15.1 | 5.7 |
| Group 6 | 15.0 | 5.6 |
| Group 7 | 15.3 | 5.5 |
| Group 8 | 15.2 | 5.5 |
From above-mentioned table 5, table 6 as can be seen that using the polystyrene emulsion prepared in the framework of the present definition, to most
The performance influence difference of whole heat-conductive coating is little, and effect is suitable.The related data of comparative example shows in example 1, herein
Effect is suitable, therefore does not show again.
Embodiment three: the preparation parameter of preferred heat-conductive coating
1,5 groups of silicon dioxide gel are prepared by one group 4 of embodiment of method；Polyphenyl is prepared by two group 2 of method of embodiment
5 groups of vac emulsion；According to graphene oxide dispersion, graphene oxide: deionized water=1:25 prepares graphene oxide dispersion
5 groups of liquid.5 groups of coatings are prepared according to the above method, and the parameter of specific prepares coating is as shown in table 7.
7 each group design parameter of table
2, thermal coefficient is tested by the method for embodiment one, the results are shown in Table 8.
8 thermal coefficient of table is shown
| Group | Thermal coefficient (W/ (m*K)) |
| Group 1 | 16.5 |
| Group 2 | 23.2 |
| Group 3 | 26.1 |
| Group 4 | 28.9 |
| Group 5 | 30.1 |
| Group 6 | 25.1 |
| Group 7 | 23.2 |
| Comparative example | 39.8 |
3, by the method test lifting temp effect of embodiment one, the results are shown in Table 9.
9 cold cycling of table goes up and down temp effect and shows
It can be seen that the increase with graphene oxide tret from table 8, table 9, thermal coefficient is continuously increased, but heating and cooling
It is not fully such when effect.Graphene oxide and silica tret are too low, can not be effectively formed honeycomb structure, and heating becomes
Fastly, cool down slack-off；Graphene oxide tret is excessively high, and lifting temp effect is also undesirable.
Thermal dispersant coatings of the invention have the following technical effects and advantage:
1, the thermal coefficient of graphene is high, and large specific surface area can be obviously improved the heating conduction of coating, be widely used
In various coating, but graphene is easily reunited, and destroys the uniformity of material dispersion, the synthesis heating conduction of coating is caused to drop
It is low.Polystyrene emulsion, a part of titanium dioxide is added in silicon dioxide gel and graphene oxide dispersion by the present invention together
Silicon and graphene oxide are adsorbed onto Polystyrene latex spheres surface by electrostatic force；Another part is then dispersed in the water of lotion
Xiang Zhong；And eventually by dip-coating method, the surface texture that graphene oxide and silica are all evenly distributed is formed, pole is conducive to
The formation of thermal conducting path.
2, the thermal coefficient for improving coating can not improve its heating conduction completely, it is also necessary to improve between coating and interface
Heating conduction could quickly transfer heat away from.Organic component (polystyrene) is decomposed by heat treatment, coating surface
Porous honeycomb is presented, there is bigger specific surface area, the more conducively transmitting of heat compared to smooth surface.
3, coating surface prepared by the present invention is different from conventional single hydrophobic structure surface, but hydrophilic-hydrophobic is presented
Blending surface, and by honeycomb surface texture, achieve the effect that super hydrophilic-super-hydrophobic blending surface.For water-cooling
Device after water reaches certain temperature, forms bubble in coating surface, the hydrophobic region of coating surface effectively promotees as bubble nucleating point
Into bubble nucleating, heat output is improved；Hydrophilic area then limits bubble sprawling on heating surface, improves critical heat flux density.
This blending surface has better pool Boiling Heat Transfer performance relative to common single hydrophobic surface or water-wetted surface.
It is the embodiment of the embodiment of the present invention above, it is noted that those skilled in the art are come
It says, without departing from the principles of the embodiments of the present invention, several improvements and modifications can also be made, these improvements and modifications
It is considered as protection scope of the present invention.
Claims (10)
1. a kind of wireless charger characterized by comprising sequentially connected energy transmitting line and foreign bodies detection circuit,
The energy transmitting line, including, concatenated alternating source Us, energy transmit coil inductance L, equivalent capacity C and equivalent
Loss resistance R；
The foreign bodies detection circuit, including, sequentially connected conversion module and processing module；
The input terminal of the conversion module is in parallel with the equivalent capacity C of the energy transmitting line, and the conversion module is used for will
The oscillatory voltage signals of the equivalent capacity C are converted into digital square-wave；
The processing module, including processing chip, the output end of an I/O pin and the conversion module of the processing chip
Connection, number of cycles of the processing module for the digital square-wave in recording period T.
2. wireless charger according to claim 1, which is characterized in that the conversion module includes: voltage regulation unit, compares
Converting unit and filter unit.
3. wireless charger according to claim 2, which is characterized in that the voltage regulation unit includes a fixed voltage
Source, first diode and the second diode, the fixed voltage source, first diode and the second diode are sequentially connected in series, described
Second diode is in parallel with the equivalent capacity C of the energy transmitting line, and the parallel connection intersection point end is as the voltage regulation unit
Output end.
4. wireless charger according to claim 2, which is characterized in that the relatively converting unit includes: that voltage compares
Device, reference voltage subelement and output subelement；The output of the first input end of the voltage comparator and the voltage regulation unit
End connection；Second input terminal of the voltage comparator is connect with the reference voltage subelement；The voltage comparator it is defeated
Outlet is connect with the output subelement.
5. wireless charger according to claim 4, which is characterized in that the reference voltage subelement includes: the first electricity
Resistance and second resistance, the first resistor and second resistance and the fixed voltage in the voltage regulation unit are source-series, and described first
The connecting pin of resistance and the second resistance is connect with the second input terminal of the voltage comparator.
6. wireless charger according to claim 4, which is characterized in that the output subelement includes: output resistance, institute
Output resistance is stated to connect with the output end of the voltage comparator.
7. wireless charger according to claim 2, which is characterized in that the filter unit includes: filter capacitor, described
The output end of filter capacitor converting unit compared with described connects, the output end of filter capacitor converting unit compared with described
Connecting pin with it is described processing chip I/O pin connect.
8. wireless charger as described in claim 1, which is characterized in that the processing module further include: prompting submodule, institute
It states prompting submodule indescribably to show for being classified according to the quality factor of different coil inductance L, the classification, which you can well imagine, to be shown as
The quality factor of different coil inductance L prompt different information, the quality factor and the number of cycles of the coil inductance L
It is directly proportional；The classification, which you can well imagine, to be shown as: being classified indescribably show and/or by charging unit to being electrically charged dress on the charging device
Transmission is set to be classified other prompt information and/or send the other prompt information of classification to user terminal by charging unit, it is described to be electrically charged
Device is different devices from user terminal.
9. the wireless charger as described in claim 1-8 any one, which is characterized in that the whole surface of the shell of charger
Thermal dispersant coatings are provided with, the thermal dispersant coatings are process as follows:
By liquor capacity number, by 13~30% silicon dioxide gel, 13~30% graphene oxide dispersion, 40~
75% polystyrene emulsion forms liquid phase coating, and the silicon dioxide gel and graphene oxide dispersion are isometric；It will
Carrier to be radiated immerses in the coating, takes out after 8~10min, take-off time≤10s is dried at room temperature for；It repeats above-mentioned
Operation 3 times is heat-treated after dry at 300 DEG C to get thermal dispersant coatings；
The silicon dioxide gel the preparation method comprises the following steps: ethyl orthosilicate is added to absolute ethanol, be stirring evenly and then adding into alkali
Property catalyst, the basic catalyst be by volume, concentrated ammonia liquor: the mixed solution that sodium fluoride=1:0.2 is uniformly mixed so as to obtain, 45 DEG C
Lower stirring 12h, adds vinyltriethoxysilane, obtains silicon dioxide gel；Wherein, by volume parts, ethyl orthosilicate:
Dehydrated alcohol: basic catalyst: silane coupling A -151=10:50~120:2~5:1；
The graphene oxide dispersion the preparation method comprises the following steps: by weight, 20~30 parts of deionizations are added in 1 part of graphene oxide
In water, power 60W is ultrasonically treated 3h to get graphene oxide dispersion；
The polystyrene emulsion the preparation method comprises the following steps: by styrene monomer be added deionized water in, add anhydrous sorbitol
Monoleate polyoxyethylene ether is sufficiently stirred to form lotion, and gained lotion is passed through nitrogen at 70 DEG C, and adding concentration is 3%
Ammonium persulfate aqueous solution, polymerization reaction 7h obtains polystyrene emulsion；Wherein, in parts by weight, styrene monomer: go from
Sub- water: Tween80: ammonium persulfate aqueous solution=1:3~7:0.05~0.10:0.1~0.3；
Or liquid phase coating press liquor capacity number, by 22% silicon dioxide gel, 56% graphene oxide dispersion,
22% polystyrene emulsion composition.
10. a kind of wireless charging foreign matter detecting method, the method is applied to the described in any item wireless chargings of claim 1 to 8
In electric appliance characterized by comprising
Single order step excitation signal e (t) is sent to the alternating source Us；
Receive the digital square-wave that the output end of the conversion module transmits；
The number of cycles of the digital square-wave in recording period T；
The quality factor q of the energy transmit coil inductance L is calculated according to the number of cycles；
User is classified according to the quality factor q and is indescribably shown；
The quality factor q that the energy transmit coil inductance L is calculated according to the number of cycles, comprising: pass through following public affairs
Formula calculates quality factor q,
Q=N π/ln (u1/u2), wherein N is the number of cycles, and the u1 and u2 are respectively the conversion module input terminal
Starting voltage peak and end voltage peak in period T.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021057849A1 (en) * | 2019-09-24 | 2021-04-01 | 无锡华润矽科微电子有限公司 | Inductor quality factor measurement method, corresponding measurement circuit and application thereof |
| CN113098153A (en) * | 2021-04-13 | 2021-07-09 | 浙江泰米电子科技有限公司 | Foreign matter detection method of LCLP wireless charging system |
| WO2021238598A1 (en) * | 2020-05-27 | 2021-12-02 | 华为数字能源技术有限公司 | Quality factor detection circuit and detection method based on oscillating circuit, and electronic device |
| CN114189063A (en) * | 2020-09-11 | 2022-03-15 | 登丰微电子股份有限公司 | Metal foreign body detecting device |
| CN114785002A (en) * | 2022-06-15 | 2022-07-22 | 小米汽车科技有限公司 | Wireless charging method, system and storage medium |
| CN116087672A (en) * | 2023-04-12 | 2023-05-09 | 荣耀终端有限公司 | Method and device for detecting charging |
| CN117129763A (en) * | 2023-04-24 | 2023-11-28 | 荣耀终端有限公司 | Handwriting pen offset detection method and electronic equipment |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130077360A1 (en) * | 2011-09-26 | 2013-03-28 | Qualcomm Incorporated | Systems, methods, and apparatus for rectifier filtering for input waveform shaping |
| CN103176217A (en) * | 2011-12-26 | 2013-06-26 | 索尼公司 | Detecting device, detecting system, power transmitting device, noncontact power transmission system, and detecting method |
| CN106189556A (en) * | 2016-08-15 | 2016-12-07 | 山东天汇防水材料有限公司 | A kind of ultra-hydrophobic conductive coating and preparation method thereof |
| CN106685029A (en) * | 2017-01-11 | 2017-05-17 | 天地（常州）自动化股份有限公司 | Wireless charging device and metal foreign substance detection method thereof |
| CN106972646A (en) * | 2017-04-20 | 2017-07-21 | 北京理工大学 | Pulse energy injection type wireless electric energy transmission device |
| CN107011760A (en) * | 2016-01-28 | 2017-08-04 | 3M中国有限公司 | For the coating composition and preparation method of antireflection coatings and by its obtained antireflective coating |
-
2018
- 2018-07-27 CN CN201810844960.4A patent/CN109004771A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130077360A1 (en) * | 2011-09-26 | 2013-03-28 | Qualcomm Incorporated | Systems, methods, and apparatus for rectifier filtering for input waveform shaping |
| CN103828191A (en) * | 2011-09-26 | 2014-05-28 | 高通股份有限公司 | Systems, methods, and apparatus for rectifier filtering for input waveform shaping |
| CN103176217A (en) * | 2011-12-26 | 2013-06-26 | 索尼公司 | Detecting device, detecting system, power transmitting device, noncontact power transmission system, and detecting method |
| CN107011760A (en) * | 2016-01-28 | 2017-08-04 | 3M中国有限公司 | For the coating composition and preparation method of antireflection coatings and by its obtained antireflective coating |
| CN106189556A (en) * | 2016-08-15 | 2016-12-07 | 山东天汇防水材料有限公司 | A kind of ultra-hydrophobic conductive coating and preparation method thereof |
| CN106685029A (en) * | 2017-01-11 | 2017-05-17 | 天地（常州）自动化股份有限公司 | Wireless charging device and metal foreign substance detection method thereof |
| CN106972646A (en) * | 2017-04-20 | 2017-07-21 | 北京理工大学 | Pulse energy injection type wireless electric energy transmission device |
Non-Patent Citations (3)
| Title |
|---|
| 刘万辉等: "《复合材料》", 31 March 2017, 哈尔滨工业大学出版社 * |
| 梁仁杰等: "《化工工艺学》", 30 March 1998, 重庆大学出版社 * |
| 理查德-布洛克利等: "《流体动力学与空气热力学》", 30 June 2016, 北京理工大学出版社 * |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021057849A1 (en) * | 2019-09-24 | 2021-04-01 | 无锡华润矽科微电子有限公司 | Inductor quality factor measurement method, corresponding measurement circuit and application thereof |
| CN112630540A (en) * | 2019-09-24 | 2021-04-09 | 无锡华润矽科微电子有限公司 | Inductance quality factor measuring method, corresponding measuring circuit and application thereof |
| WO2021238598A1 (en) * | 2020-05-27 | 2021-12-02 | 华为数字能源技术有限公司 | Quality factor detection circuit and detection method based on oscillating circuit, and electronic device |
| CN114189063A (en) * | 2020-09-11 | 2022-03-15 | 登丰微电子股份有限公司 | Metal foreign body detecting device |
| CN113098153A (en) * | 2021-04-13 | 2021-07-09 | 浙江泰米电子科技有限公司 | Foreign matter detection method of LCLP wireless charging system |
| CN114785002A (en) * | 2022-06-15 | 2022-07-22 | 小米汽车科技有限公司 | Wireless charging method, system and storage medium |
| CN114785002B (en) * | 2022-06-15 | 2023-09-19 | 小米汽车科技有限公司 | Wireless charging method, system and storage medium |
| CN116087672A (en) * | 2023-04-12 | 2023-05-09 | 荣耀终端有限公司 | Method and device for detecting charging |
| CN117129763A (en) * | 2023-04-24 | 2023-11-28 | 荣耀终端有限公司 | Handwriting pen offset detection method and electronic equipment |
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