CN106685029A - Wireless charging device and metal foreign substance detection method thereof - Google Patents
Wireless charging device and metal foreign substance detection method thereof Download PDFInfo
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- CN106685029A CN106685029A CN201710016935.2A CN201710016935A CN106685029A CN 106685029 A CN106685029 A CN 106685029A CN 201710016935 A CN201710016935 A CN 201710016935A CN 106685029 A CN106685029 A CN 106685029A
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- 238000001514 detection method Methods 0.000 title claims abstract description 38
- 239000002184 metal Substances 0.000 title claims abstract description 16
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 16
- 239000000126 substance Substances 0.000 title abstract 7
- 238000000034 method Methods 0.000 claims abstract description 19
- 230000005540 biological transmission Effects 0.000 claims abstract description 5
- 238000006243 chemical reaction Methods 0.000 claims description 12
- 238000004891 communication Methods 0.000 claims description 12
- 230000003321 amplification Effects 0.000 claims description 10
- 238000005259 measurement Methods 0.000 claims description 10
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 10
- 238000005070 sampling Methods 0.000 claims description 8
- 238000011282 treatment Methods 0.000 claims description 6
- 230000009467 reduction Effects 0.000 claims description 4
- 230000006698 induction Effects 0.000 abstract description 8
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- 238000005516 engineering process Methods 0.000 abstract description 3
- 230000035945 sensitivity Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000004364 calculation method Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
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- 239000012925 reference material Substances 0.000 description 1
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- H02J7/025—
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Abstract
The invention proposes a metal foreign substance detection method based on a quality factor. The method is applicable to a wireless charging device of a magnetic induction technology. The device comprises an emission end and a receiving end. When a metal foreign substance exists between a primary coil of the emission end and a secondary coil of the receiving end, the metal foreign substance will be heated by an eddy current effect to cause a serious safety potential. The detection method proposed by the invention is used for detecting the metal foreign substance, and power transmission can be automatically ended. The core content lies that the quality factor of the primary coil of the emission end is detected, whether the metal foreign substance exists is judged by comparing a detection value and a setting threshold value, the fact that the metal foreign substance exists is judged if the detection value is smaller than the setting threshold value, the emission end prompts warning, and the power transmission is ended.
Description
Technical field
The present invention relates to induction wireless charger (QI standards), more particularly to a kind of wireless charging device and its gold
Category foreign matter detecting method.
Background technology
Wireless charging device uses magnetic induction technology, performs the Qi standards of standard compatibility international wireless charging alliance (WPC).
The primary coil of wireless charging device transmitting terminal and the secondary coil of receiving terminal, power and information are transmitted by electromagnetic induction.
When there is metallic foreign body between two coils, because the effect of eddy current effect can produce amount of heat on metallic foreign body, exist
Serious potential safety hazard, therefore metallic foreign body detection is the necessary functions of wireless charging device.
The metallic foreign body to wireless charging device detects the power attenuation being mainly by detecting transmitting terminal in the market
, come what is realized, peripheral circuit is simple, foreign bodies detection sensitivity hardly possible regulation is easily calculated, but exist, the problems such as reporting by mistake, fail to report for mode.
The reason for causing above mentioned problem is more complicated, be on the one hand loss power of the power attenuation method in inverter bridge and transmitting coil not
Can be obtained by direct measurement mode, therefore the calculation error formed when power attenuation is calculated result in the detection of metallic foreign body
It is not accurate enough；On the other hand, the threshold value setting of metallic foreign body alarm power attenuation can influence the sensitivity of foreign bodies detection, and optimal
Difficulty is big, it is necessary to by substantial amounts of experiment come the empirical value of accumulating and enriching in realization for the determination of power attenuation threshold value.
For the foreign bodies detection of wireless charging device, the power attenuation method of in the market can not be obtained by direct measurement mode
The loss power in inverter bridge and transmitting coil is obtained, therefore there is calculation error in power attenuation calculating process, and then caused
There is the difficult regulation of sensitivity in foreign bodies detection, the problems such as reporting by mistake, fail to report.Tested by the similar wireless charging device of in the market
It was found that, using same unitary coin as metallic foreign body, the device of power attenuation method in 2 groups of 100 foreign bodies detections tests,
Produce wrong report or fail to report number of times and be respectively 7 times and 9 times, the accuracy of foreign bodies detection is maintained between 91%~93%.
The content of the invention
The purpose of the present invention is the defect for overcoming prior art to exist, there is provided one kind is based on detection transmitting terminal primary coil product
The method that prime factor changes to determine whether there is metallic foreign body, in the presence of metallic foreign body, coil q can reduce, when
When quality factor are less than the comparing threshold value for setting, there is metallic foreign body in judgement, and transmitting terminal prompting alarm simultaneously terminates power biography automatically
It is defeated；Quality factor method can directly obtain input voltage value and coil voltage value in inverter bridge, compared with power attenuation method for, do not draw
Enter calculation error, thus foreign bodies detection sensitivity and accuracy be above power attenuation method a kind of wireless charging device and its
Metal foreign matter detecting method.
Realizing the technical scheme of the object of the invention is：A kind of wireless charging device, is made up of transmitting terminal and receiving terminal；It is described
Transmitting terminal is made up of launch driving circuit and transmitting terminal primary coil；The receiving terminal is secondary by reception drive circuit and receiving terminal
Coil is constituted；The launch driving circuit includes inversion bridge circuit, communication demodulator circuit, coil power U/I detection circuit and product
Prime factor Q detects circuit；One input of the inversion bridge circuit is connected by voltage conversion circuit with DC voltage, another
Individual input connects the output end of transmitting terminal master control IC, and the output end of inversion bridge circuit passes through transmitting terminal primary coil LC resonance circuits
It is connected with the input of coil power U/I detection circuits and the input of quality factor q detection circuit respectively afterwards；The coil work(
The input of the output end of rate U/I detection circuits and the output end of quality factor q detection circuit with transmitting terminal master control IC is connected；
The input of the communication demodulator circuit connects the output end of transmitting terminal primary coil LC resonance circuits, and its output end meets transmitting terminal master
Control the input of IC；The reception drive circuit includes rectifier circuit, communication modulation circuit and reduction voltage circuit；The rectifier bridge
The input termination receiving terminal secondary coil LCC resonance circuits of circuit, its output end is connected by reduction voltage circuit with load equipment；Institute
Two inputs for stating communication modulation circuit are connected with the output end of receiving terminal master control IC and the output end of rectifier circuit respectively.
The sampling coil voltage C_V2 of quality factor q detection circuit takes the electric capacity of inversion bridge circuit described in above-mentioned technical proposal
The commonly connected terminal voltage of C and inductance L, the sampled input voltage C_V1 of quality factor q detection circuit takes the electricity of inversion bridge circuit
Hold another terminal voltage of C；The sampled input voltage C_V1 and sampling coil voltage C_V2 by one-level differential amplification, two grades
LPF follows treatment with signal, improves the input impedance of signal, the signal Q_V1_AD1 and Q_V2_AD2 after amplification point
Not Jin Ru transmitting terminal master control IC modulus AD conversion passage 1 and modulus AD conversion passage 2.
A kind of metal foreign matter detecting method of wireless charging device, comprises the following steps：
1) measuring method specified according to Qi standards, is demarcated by test method and refers to quality factor qreferenceAnd determine
Compare threshold value Qthreshold, wherein Qthreshold<90%Qreference；
2) by detecting the quality factor q of the actual measurement of transmitting terminal primary coilmeasuredChange determine whether there is
Metallic foreign body, when the quality factor q of actually measurementmeasuredMore than the comparing threshold value Q of settingthresholdWhen, judge do not exist metal
Foreign matter；When the quality factor q of actually measurementmeasuredLess than the comparing threshold value Q of settingthresholdWhen, there is metallic foreign body in judgement,
Transmitting terminal prompting alarm simultaneously terminates power transmission automatically.
Quality factor described in above-mentioned technical proposal
After adopting the above technical scheme, the present invention has following positive effect：
(1) present invention can accurately detect the foreign matter between wireless charging device, and adjustment work parameter, it is to avoid because of gold
The intervention for belonging to foreign matter produces eddy current effect to form the power attenuation even latent defect such as fire generation, improves wireless charging device
Security and functional reliability.
(2) it is of the invention when there is metallic foreign body between transmitting terminal primary coil and receiving terminal secondary coil, eddy current effect meeting
Cause metallic foreign body to be heated, cause serious potential safety hazard.Detection method set forth in the present invention is used to detect that the metal is different
Thing simultaneously can automatically terminate power transmission.
Brief description of the drawings
In order that present disclosure is easier to be clearly understood, it is right below according to specific embodiment and with reference to accompanying drawing
The present invention is described in further detail, wherein
Fig. 1 is wireless charging device block diagram of the invention；
Fig. 2 is LC series resonances equivalent circuit block diagram of the invention；
Fig. 3 is that quality factor threshold value of the invention sets schematic diagram；
Fig. 4 is full-bridge inverting sampled signal schematic diagram of the invention；
Fig. 5 is sampled voltage signal transacting schematic diagram in quality factor q of the invention detection circuit；
Specific embodiment
(embodiment 1)
See Fig. 1, the present invention has a kind of wireless charging device, is made up of transmitting terminal 1 and receiving terminal 2；The transmitting terminal 1 by
Launch driving circuit and transmitting terminal primary coil are constituted；The receiving terminal 2 is by reception drive circuit and receiving terminal secondary coil group
Into；The launch driving circuit include inversion bridge circuit 3, communication demodulator circuit 4, coil power U/I detection circuit 5 and quality because
Number Q detection circuits 6；One input of the inversion bridge circuit 3 is connected by voltage conversion circuit 7 with DC voltage 8, another
Individual input connects the output end of transmitting terminal master control IC9, and the output end of inversion bridge circuit 3 is by transmitting terminal primary coil LC resonance electricity
It is connected with the input of coil power U/I detection circuits 5 and the input of quality factor q detection circuit 6 respectively behind road 10；It is described
The output end of coil power U/I detection circuits 5 and the output end of quality factor q detection circuit 6 are defeated with transmitting terminal master control IC9
Enter end to be connected；The input of the communication demodulator circuit 4 connects the output end of transmitting terminal primary coil LC resonance circuits 10, its output
The input of termination transmitting terminal master control IC9；The reception drive circuit includes rectifier circuit 11, communication modulation circuit 12 and drop
Volt circuit 13；The input termination receiving terminal secondary coil LCC resonance circuits 14 of the rectifier circuit 11, its output end is by drop
Volt circuit 13 is connected with load equipment 15；Two inputs of the communication modulation circuit 12 are respectively with receiving terminal master control IC16's
Output end is connected with the output end of rectifier circuit 11.
1. tank circuit factor
See Fig. 2, wireless charging transmitting terminal induction coil inductance L and series capacitance C composition series resonant circuit, due to circuit
It is middle to there is certain loss, such as ohmic loss and radiation loss of inductance coil, the dielectric loss of electric capacity.With the liter of frequency
Height, the ohmic loss and radiation loss that Kelvin effect also results in inductance coil increases.
When circuit is operated near resonant frequency point, it is necessary to consider the influence of these losses.Therefore, series resonant circuit
The series circuit of inductance L, electric capacity C and equivalent loss resistance R is equivalent to, its equiva lent impedance Z computing formula are as follows：
WhereinReactance is represented, as X=0, the reactance in series resonant circuit is zero, circuit presents humorous
Shake state.Now corresponding frequency is resonance frequency omega0。
The impedance of series resonant circuit is rendered as real number resistance at resonant frequency, and impedance magnitude reaches minimum | Z
|MIN=R, phase difference=0 of voltage and current.Impedance is minimized value, and electric current reaches maximum.At the resonant frequency fx, it is false
If input voltage is VS, then the computing formula of inductance and capacitance voltage is as follows：
Formula (2) is substituted into formula (3), formula (4), the voltage on inductance and electric capacity can be expressed as follows：
If metThe modulus value of voltage can also be much larger than input voltage on inductance and electric capacity | VS|.LC series connection is humorous
Shake circuit quality factor q computing formula it is as follows：
When being represented using quality factor, the magnitude calculation formula of voltage is as follows on inductance and electric capacity at the resonant frequency fx：
|VL|=| VC|=Q | VS| (8)
Therefore, LC series resonant circuits have vibration amplification, the amplitude of input signal can be improved into Q times.
2. quality factor method Cleaning Principle
When there is metallic foreign body on transmitting terminal primary coil, the inductance value L of primary coil can reduce, equivalent resistance R meetings
Increase, understands that the quality factor q of transmitting terminal primary coil can reduce according to resonance circuit derivation formula (7).Therefore, by inspection
The change of the quality factor of primary coil is surveyed, can recognize that coil induction zone is interior with the presence or absence of metallic foreign body.
See Fig. 3, to improve the accuracy and reliability of metallic foreign body identification, transmitting terminal primary coil needs to demarcate reference material
Prime factor QreferenceCompare threshold value Q with determinationthreshold。QreferenceAccording to the measuring method that Qi standards specify, by experiment side
Formula is obtained, QthresholdSetting value is at least less than Qreference90%, and need consideration to manufacture error and measurement error.
QmeasuredIt is the figure of merit value of actual measurement, when not existing metallic foreign body between induction coil, QmeasuredValue is more than
QthresholdValue；When there is metallic foreign body between induction coil, QmeasuredValue is less than QthresholdValue.
3. quality factor detection method
From formula (9), by detecting inductive drop VLWith input voltage VSAmplitude monitor the change of quality factor
Change.See Fig. 4, wireless charging transmitting terminal uses full-bridge inverting mode, inverter bridge to be made up of 4 NMOS tubes, upper bridge input voltage
VCC, lower bridge after sampling resistor R by being grounded.Inverter bridge can be operated in half-bridge and full-bridge mode, to protect 4 of inverter bridge
NMOS tube, should avoid upper and lower 2 NMOS tubes from simultaneously turning on, and the control of NMOS tube needs to increase dead area compensation.Bridge under inverter bridge
The electric current of inversion bridge loop is converted to voltage signal again by after amplifier and RC low-pass filtering treatments, feeding is sent out by sampling resistor R
Penetrating end master control IC carries out modulus AD conversion.The signal is used for the transimission power of dynamic adjustment wireless charging device transmitting terminal.
Voltage C_V2 sampling coil voltages, voltage C_V1 sampled input voltages, coil voltage C_V2 and input voltage C_V1
The ratio of modulus value is coil q Qmeasured。
As shown in figure 5, sampled voltage C_V1 is by one-level differential amplification, two-stage low-pass ripple follows treatment, carries with signal
The input impedance of signal high, the signal Q_V1_AD1 after amplification enters the modulus AD conversion passage 1 of transmitting terminal master control IC.
Sampled voltage C_V2 follows treatment, improves signal by one-level differential amplification, two-stage low-pass ripple with signal
Input impedance, the signal Q_V2_AD2 after amplification enters the modulus AD conversion passage 2 of transmitting terminal master control IC.
Due to the vibration amplification of L C series resonant circuits, input voltage C_V1 has with sampling coil voltage C_V2
Identical frequency and phase, only amplitude are different.Therefore, amplifying by signal, after the treatment such as LPF, into transmitting terminal master
Value after control IC modulus AD conversion, can obtain as input voltage and the substitution value of coil voltage by being directly compared
Figure of merit value Q.
Assuming that the value that input voltage C_V1 and coil voltage C_V2 enters after transmitting terminal master control IC modulus AD conversion is respectively
C_V1_AD1_IC and C_V2_AD2_IC, then quality factor qmeasuredCan be calculated by following simplified formula：
Work as Qmeasured>QthresholdWhen, do not exist metallic foreign body between induction coil；Work as Qmeasured<QthresholdWhen, sensing
There is metallic foreign body between coil.
Work as Qmeasured=QthresholdWhen, consider this state can be determined that into metallic foreign body from safety factor；From detection
For sensitivity requirement angle, if desired foreign bodies detection sensitivity is moderate, then can determine that to be in the absence of metallic foreign body；It is above-mentioned all
Judgement be all to be completed by software program, flexibility is high, can dynamically adjust according to the actual requirements.
Particular embodiments described above, has been carried out further in detail to the purpose of the present invention, technical scheme and beneficial effect
Describe in detail bright, should be understood that and the foregoing is only specific embodiment of the invention, be not intended to limit the invention, it is all
Within the spirit and principles in the present invention, any modification, equivalent substitution and improvements done etc., should be included in guarantor of the invention
Within the scope of shield.
Claims (4)
1. a kind of wireless charging device, is made up of transmitting terminal and receiving terminal；The transmitting terminal is by launch driving circuit and transmitting terminal
Primary coil is constituted；The receiving terminal is made up of reception drive circuit and receiving terminal secondary coil；The launch driving circuit bag
Include inversion bridge circuit, communication demodulator circuit and coil power U/I detection circuits；One input of the inversion bridge circuit passes through
Voltage conversion circuit is connected with DC voltage, and another input connects the output end of transmitting terminal master control IC, inversion bridge circuit it is defeated
Go out input of the end by detecting circuit with coil power U/I after transmitting terminal primary coil LC resonance circuits to be connected；The coil
The output end of power U/I detection circuits is connected with the input of transmitting terminal master control IC；The input termination of the communication demodulator circuit
The output end of transmitting terminal primary coil LC resonance circuits, its output end connects the input of transmitting terminal master control IC；Described reception drives
Circuit includes rectifier circuit, communication modulation circuit and reduction voltage circuit；The input termination receiving terminal of the rectifier circuit is secondary
Coil LCC resonance circuits, its output end is connected by reduction voltage circuit with load equipment；Two inputs of the communication modulation circuit
End is connected with the output end of receiving terminal master control IC and the output end of rectifier circuit respectively, it is characterised in that：The transmitting drives
Circuit also includes that quality factor q detects circuit；It is humorous that the input of the quality factor q detection circuit meets transmitting terminal primary coil LC
Shake the output end of circuit, its output end connects the input of transmitting terminal master control IC.
2. a kind of wireless charging device according to claim 1, it is characterised in that：The quality factor q detection circuit
Sampling coil voltage C_V2 takes the commonly connected terminal voltage of the electric capacity C and inductance L of inversion bridge circuit, quality factor q detection circuit
Sampled input voltage C_V1 take inversion bridge circuit electric capacity C another terminal voltage；The sampled input voltage C_V1 and sampling
Coil voltage C_V2 follows treatment by one-level differential amplification, two-stage low-pass ripple and signal, improves the input resistance of signal
Anti-, signal Q_V1_AD1 and Q_V2_AD2 after amplification respectively enter the modulus AD conversion passage 1 and modulus of transmitting terminal master control IC
AD conversion passage 2.
3. the metal foreign matter detecting method of a kind of wireless charging device according to claim 1, it is characterised in that：Including with
Lower step：
1) measuring method specified according to Qi standards, demarcation refers to quality factor qreferenceAnd threshold value Q is compared in determinationthreshold,
Wherein Qthreshold<90%Qreference；
2) by detecting the quality factor q of the actual measurement of transmitting terminal primary coilmeasuredChange determine whether there is metal
Foreign matter, when the quality factor q of actually measurementmeasuredMore than the comparing threshold value Q of settingthresholdWhen, judge different in the absence of metal
Thing；When the quality factor q of actually measurementmeasuredLess than the comparing threshold value Q of settingthresholdWhen, be present metallic foreign body in judgement, send out
Penetrate end prompting alarm and terminate power transmission automatically.
4. the metal foreign matter detecting method of wireless charging device according to claim 3, it is characterised in that：The step 2
In, quality factor
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| CN107947395A (en) * | 2017-11-10 | 2018-04-20 | 维沃移动通信有限公司 | The detection method and wireless charger of a kind of metallic foreign body |
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