CN109143386A - Metal foreign matter detection method of induction type power supply and power supply module thereof - Google Patents
Metal foreign matter detection method of induction type power supply and power supply module thereof Download PDFInfo
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- G01V3/102—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils by measuring the impedance of the search coil; by measuring features of a resonant circuit comprising the search coil by measuring amplitude
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Abstract
The invention discloses a metal foreign matter detection method, which is used for a power supply module of an induction type power supply, wherein the power supply module comprises a power supply coil; measuring a plurality of wave peaks of the coil signal in a plurality of continuous oscillation periods of the coil signal to respectively obtain a plurality of peak trigger voltages; calculating a first attenuation parameter according to a first peak trigger voltage and a second peak trigger voltage in the plurality of peak trigger voltages; and comparing the first attenuation parameter with a first critical value to judge whether metal foreign matters exist in a power transmission range of the induction type power supply.
Description
Technical field
The present invention relates to a kind of metal foreign matter detecting method more particularly to a kind of gold that can be used for inductive power-supply supply device
Belong to foreign matter detecting method.
Background technique
In inductive power-supply supply device, feeder ear pushes power supply coil to generate resonance by driving circuit, and then issues
Radio frequency electromagnetic, then electrical conversion is carried out after receiving electromagnetic wave energy by the coil of receiving end, to generate DC power supply offer
Give receiving end device.If electromagnetic energy transmitted by power supply coil is applied on metallic object, heating effect can be generated to it, accumulated
It may cause metallic object high temperature after heat to cause to burn and occurrence injury.In the prior art, inductive power-supply supply device can be
Driving is periodically interrupted in transmission process to carry out metallic foreign body detection, is judged by measuring the variation of slope.
However, the power that power supply end-coil is exported can be adjusted at any time at a distance from receiving end with feeder ear, such as work as coil distance
Relatively high power is exported when farther out, and smaller power is exported when coil distance is closer.With the change of output power, coil signal
Amplitude also changes, so that the case where resonance signal is decayed when coil interrupts driving is also different.Therefore, when power occurs
When variation, the voltage that feeder ear needs to spend several detecting periods to adjust comparator setting, with trace signals peak value.If because of function
In the case that rate or load cause coil voltage unstable, it is difficult to which locking signal peak value is to judge attenuation slope.
In addition, in order to judge attenuation slope, driving signal need to interrupt a period of time.However, in during wireless charging
Disconnected driving signal can reduce overall power fan-out capability, if the break period is too long, will affect power supply efficiency, and when too long interruption
Between after be re-engaged driving signal be easy to produce excessive electromagnetic interference (Electromagnetic Interference,
EMI).The prior art is the multistage slope for obtaining multiple peak voltage level by comparator module to judge coil signal decaying
Variation, thus need to interrupt longer time.By taking 106094041 A of Chinese patent application publication No. CN as an example, 7 are needed
~15 coil cycles of oscillation that do not wait complete the measurement of four peak voltage level to judge the variation of attenuation slope.
In consideration of it, it is really necessary to propose another metal foreign matter detecting method, it can be in extremely short interruption driving time
The effect of completing detection, while power or load variation being avoided to influence metallic foreign body detection.
Summary of the invention
Therefore, the main object of the present invention is to be that detection can be completed in extremely short interrupting by providing one kind in driving time
Metal foreign matter detecting method is minimum that metallic foreign body detection can be completed within 2~3 coil cycles of oscillation.In addition, of the invention
Metal foreign matter detecting method can be judged that the attenuation slope that can solve the prior art is sentenced by the attenuation ratio of coil signal
The shortcomings that disconnected mode is vulnerable to coil amplitude and load effect.
The invention discloses a kind of metal foreign matter detecting method, for a power supply module of an inductive power-supply supply device,
The power supply module includes a power supply coil, which interrupts the inductive power supply during being included in a measurement
An at least driving signal for power supply unit is to stop driving the power supply coil, to generate the coil letter of the power supply coil
Number；Multiple wave crests of the coil signal are measured, within continuous multiple cycles of oscillation of the coil signal to obtain multiple peaks respectively
It is worth trigger voltage；According to the one first peak value trigger voltage and one second peak value trigger voltage in multiple peak value trigger voltage,
Calculate one first attenuation parameter；And compare first attenuation parameter and one first critical value, to judge that the inductive power supply supplies
It answers in an electric power range of transmission of device with the presence or absence of metallic foreign body.
The invention also discloses a kind of power supply modules for an inductive power-supply supply device, for executing a metallic foreign body
Detection method, the power supply module include a power supply coil, a resonant capacitance, at least one for electric drive unit, signal reception mould
Block and a processor.The resonant capacitance is coupled to the power supply coil, and for arranging in pairs or groups, the power supply coil carries out resonance.At least one confession
Electric drive unit is coupled to the power supply coil and the resonant capacitance, for sending an at least driving signal to the power supply coil, with
It drives the power supply coil to generate energy, and interrupts an at least driving signal during measurement to stop to the power supply coil
It is driven, to generate a coil signal of the power supply coil.The signal receiving module is coupled to the power supply coil, for receiving
The coil signal of the power supply coil.The processor is coupled to the signal receiving module, for executing following steps: in the coil
Multiple wave crests of the coil signal are measured in continuous multiple cycles of oscillation of signal, to obtain multiple peak value trigger voltages respectively；
According to the one first peak value trigger voltage and one second peak value trigger voltage in multiple peak value trigger voltage, calculates one first and decline
Subtract parameter；And compare first attenuation parameter and one first critical value, to judge an electric power of the inductive power-supply supply device
It whether there is metallic foreign body in range of transmission.
The invention also discloses a kind of metal foreign matter detecting methods, the power supply mould for an inductive power-supply supply device
Block, the power supply module include a power supply coil, which includes the phase measured during obtaining previous measurement
Corresponding previous peak trigger voltage, is set as a reference voltage value；The inductive power supply is interrupted during a measurement to supply
Answer an at least driving signal for device to stop driving the power supply coil, to generate a coil signal of the power supply coil；
A primary peak of the coil signal is measured, within a cycle of oscillation of the coil signal to obtain one first peak value triggering electricity
Pressure；Compare the first peak value trigger voltage and the reference voltage value；And when the first peak value trigger voltage is equal or close to
When the reference voltage value, judge that there is no metallic foreign bodies in an electric power range of transmission of the inductive power-supply supply device.
Detailed description of the invention
Fig. 1 is the schematic diagram of one inductive power-supply supply device of the embodiment of the present invention.
Fig. 2 is the schematic diagram of one metallic foreign body testing process of the embodiment of the present invention.
Fig. 3 is the schematic diagram for stopping driving power supply coil during a measurement.
Fig. 4~7 are the schematic diagram that the embodiment of the present invention obtains peak value trigger voltage during a measurement.
Fig. 8 is the schematic diagram of another metallic foreign body testing process of the embodiment of the present invention.
Fig. 9 is that the embodiment of the present invention carries out metallic foreign body differentiation by a peak value trigger voltage during measurement
Schematic diagram.
Wherein, the reference numerals are as follows:
100 inductive power-supply supply devices
1 power supply module
10 power supply units
111 processors
112 clock generators
113 device for generating voltage
114 comparators
120 signal receiving modules
121,122 for electric drive unit
130 bleeder circuits
131,132 divider resistance
141,142 resonant capacitance
16 power supply coils
161,261 magnetic conductor
D1, D2 driving signal
C1 coil signal
2 by electric module
21 load units
22 capacitors
230 rectification circuits
241,242 resonant capacitance
26 power receiving coils
3 metallic foreign bodies
20,80 metallic foreign body testing process
200~222,800~818 steps
CP1 comparison result
A, B, C, D, E, F wave crest
VB, VC, VD, VE, VF peak value trigger voltage
V0_B, V0_C, V0_D, V0_E, V0_F trigger take-off potential
The first attenuation parameter of PAR1
The second attenuation parameter of PAR2
PAR3 third attenuation parameter
The 4th attenuation parameter of PAR4
The first critical value of TH1
The second critical value of TH2
TH3 third critical value
The basis THO critical value
Specific embodiment
Referring to FIG. 1, Fig. 1 is the schematic diagram of one inductive power-supply supply device 100 of the embodiment of the present invention.As shown in Figure 1, sense
Answering formula power supply unit 100 includes a power supply module 1 and one by electric module 2.Power supply module 1 can receive to be supplied from a power supply
The power supply of device 10, and wireless power is exported to by electric module 2.Power supply module 1 include a power supply coil 16 and resonant capacitance 141,
142, with the structure setting of C-L-C.Wherein, power supply coil 16 can be used to send electromagnetic energy to by electric module 2 to be powered,
Resonant capacitance 141 and 142 is respectively coupled to 16 both ends of power supply coil, and the power supply coil 16 that can be used to arrange in pairs or groups in power supply carries out humorous
Vibration.In addition, in power supply module 1, the magnetic conductor 161 optionally constituted using magnetic material, for promoting power supply
The electromagnetic induction ability of coil 16, while avoiding the object in electromagnetic energy influence coil non-inductive face direction.
For the running of control power supply coil 16 and resonant capacitance 141,142, power supply module 1 further includes a processor 111, one
Clock generator 112, for electric drive unit 121 and 122, one signal receiving module 120 and a bleeder circuit 130.For electric drive
Unit 121 and 122 is coupled to power supply coil 16 and resonant capacitance 141 and 142, can send driving signal D1 and D2 respectively to power supply
Coil 16 can receive the control of processor 111, to drive power supply coil 16 to generate and send energy.For electric drive unit
When 121 and 122 the two operate simultaneously, full-bridge driving can be carried out.In some embodiments, it can also only open for electric drive unit
121 and 122 one of them, or one is only arranged for electric drive unit 121 or 122, to carry out half-bridge driven.Clock generator
112 are coupled to for electric drive unit 121 and 122, can be used to control for electric drive unit 121 and 122 send driving signal D1 and
D2.Clock generator 112 can be a pulse width modulation generator (Pulse Width Modulation generator,
PWM generator) or other types of clock generator, for export a clock signal to for electric drive unit 121 and
122.Processor 111 can receive the coil signal C1 (electricity i.e. between power supply coil 16 and resonant capacitance 142 in power supply coil 16
Press signal) relevant information, such as the resonance frequency or attenuation amplitude of coil signal C1, and differentiate whether metallic foreign body is deposited accordingly
?.Processor 111 can be a central processing unit (Central Processing Unit, CPU), a microprocessor
(microprocessor), a single-chip microcontroller (Micro Controller Unit, MCU) or other types of processing unit or fortune
Calculate device.Signal receiving module 120 can be used to the resonance frequency and peak value size of tracking coil signal C1, and by resonance frequency and
The relevant information of peak value is supplied to processor 111 to carry out subsequent interpretation.Bleeder circuit 130 includes divider resistance 131 and 132,
After it can decay to the coil signal C1 in power supply coil 16, processor 111 and signal receiving module are output this to
120.In some embodiments, it if the circuits such as processor 111 and signal receiving module 120 have enough pressure resistances, can not also adopt
With bleeder circuit 130, the coil signal C1 in power supply coil 16 is directly received by processor 111.As for other possible compositions
Component or module, such as power supply unit, display unit, visible system demand and increase or decrease, therefore do not influencing the present embodiment
Explanation under, slightly and do not show.
In one embodiment, signal receiving module 120 includes a device for generating voltage 113 and a comparator 114, such as Fig. 1
It is shown.Device for generating voltage 113 can be a digital analog converter (Digital to Analog Converter, DAC),
It can receive the reference voltage information from processor 111, is converted into analog voltage and is exported.Comparator
114 input terminal can receive reference voltage, and another input terminal then receives the coil signal C1 from power supply coil 16, can
Comparator coil signal C1 and reference voltage, processor 111 carry out subsequent judgement and signal processing further according to above-mentioned comparison result.
It is noted that signal receiving module 120 can also be incorporated into inside processor 111, and it is without being limited thereto.
Please continue to refer to Fig. 1.It is included a load unit 21, a capacitor 22, a rectification circuit 230, one by electricity by electric module 2
Coil 26 and resonant capacitance 241,242.In by electric module 2, the magnetic conductance that is also optionally constituted using magnetic material
Body 261 to promote the electromagnetic induction ability of power receiving coil 26, while avoiding the object in electromagnetic energy influence coil non-inductive face direction
Body.Power receiving coil 26 can be used to receive the power supply of power supply coil 16, and by the power transmission received to rectification circuit 230 with into
Capacitor 22 and load unit 21 that rectification is resent to rear end later are completed in row rectification.Capacitor 22 can be for being filtered
The filtered electrical electric capacity of voltage regulation that perhaps is used to stabilize the output voltage, and should not be as limit.In by electric module 2, other may
Composition component or module, such as signal feedback circuit, by electric microprocessor, visible system demand and increase or decrease, therefore
Under the explanation for not influencing the present embodiment, do not show slightly.
In addition, a metallic foreign body 3 is not included in inductive power-supply supply device 100, but power supply module 1 shown in Figure 1
And by between electric module 2 to facilitate explanation.When metallic foreign body 3 is located in the electric power range of transmission of inductive power-supply supply device 100
When, the electromagnetic energy of the transmission of power supply module 1 may be received and generated heat.Metal foreign matter detecting method of the invention can be used to
Judge with the presence or absence of metallic foreign body 3 in the electric power range of transmission of inductive power-supply supply device 100, and is judging that metallic foreign body 3 deposits
When stop power transmission.
Metallic foreign body, this hair are judged by the variation of measuring coil attenuation slope different from power supply module in the prior art
The bright voltage attenuation ratio by measuring coil signal carries out the judgement of metallic foreign body.Referring to FIG. 2, Fig. 2 is that the present invention is real
Apply the schematic diagram of a metallic foreign body testing process 20 of example.As shown in Fig. 2, metallic foreign body testing process 20 can be used for an induction type
The feeder ear (power supply module 1 of the inductive power-supply supply device 100 of such as Fig. 1) of power supply unit comprising following steps:
Step 200: starting.
Step 202: interrupting the driving signal D1 and D2 of inductive power-supply supply device 100 during a measurement to stop pair
Power supply coil 16 is driven, to generate a coil signal C1 of power supply coil 16.
Step 204: two wave crests of measuring coil signal C1 within continuous two cycles of oscillation of coil signal C1, to divide
It Qu get not two peak value trigger voltages.
Step 206: according to two peak value trigger voltages, calculating an attenuation parameter.
Step 208: comparing the corresponding critical value of attenuation parameter, and judge whether attenuation parameter is greater than critical value.
If so, thening follow the steps 216；If it is not, thening follow the steps 210.
Step 210: judging whether measured cycle of oscillation quantity reaches predetermined quantity.If so, thening follow the steps 216；
If it is not, thening follow the steps 212.
Step 212: the measuring coil signal C1 wave crest within next cycle of oscillation of coil signal C1, to obtain peak value touching
Power generation pressure.
Step 214: according to the peak value trigger voltage obtained in the peak value trigger voltage and previous cycle of oscillation, calculating one and decline
Subtract parameter.
Step 216: carrying out average to acquired attenuation parameter and generate an average result, and compare average result and one
Basic critical value, to judge whether average result is greater than basic critical value.If so, thening follow the steps 218；If it is not, then executing step
Rapid 220.
Step 218: judging that there is no metallic foreign bodies 3 in the electric power range of transmission of inductive power-supply supply device 100.
Step 220: judging that there are metallic foreign bodies 3 in the electric power range of transmission of inductive power-supply supply device 100.
Step 222: terminating.
According to metallic foreign body testing process 20, in the power supply module 1 of inductive power-supply supply device 100, driving signal D1
And D2 can be interrupted during driving a period of time, at this point, for electric drive unit 121 and 122 can stop to power supply coil 16 into
Row driving.When power supply coil 16 stops driving, because there are still energy, lines between power supply coil 16 and resonant capacitance 141 and 142
Ring signal C1 will continue to vibrate and gradually decay.As shown in figure 3, driving signal D1 and D2 are rested on respectively when stopping driving
For a period of time, the waveform for vibrating and gradually decaying is presented in coil signal C1 at this time, then for electric drive list for high potential and low potential
Member 121 and 122 is re-engaged, to export square wave driving signal D1 and D2 and again driving 16 output power of power supply coil.At it
In its embodiment, also driving signal D1 and D2 can control to rest on high potential simultaneously or rest on low potential simultaneously to stop driving
It is dynamic, and it is without being limited thereto.Above-mentioned driving signal D1 and D2 is for measuring coil signal C1 resonance to carry out metal during interrupting
Foreign matter 3 detects, to facilitate explanation during hereinafter referred to as measuring.
There are continuous multiple cycles of oscillation in during measurement, on coil signal C1, processor 111 can be in multiple oscillation weeks
The wave crest of measuring coil signal C1 in phase, to obtain multiple peak value trigger voltages respectively.Referring to FIG. 4, Fig. 4 is that the present invention is implemented
Example obtains peak value trigger voltage and the schematic diagram of VC during a measurement.As shown in figure 4, coil signal C1 during measurement
Including three wave crests A, B and C.Since first wave crest A occurs just to have stopped the time of driving, wave crest A in driving signal D1 and D2
Signal oscillating may still be driven signal D1 and D2 influence rather than the natural oscillation of power supply coil 16 itself, therefore, wave
The peak height of peak A may not yet reach the height of nature oscillation.In this case, to avoid the judgement of metallic foreign body 3 from being driven
Dynamic signal D1 and D2 are influenced and are distorted, and can give up the peak value trigger voltage measurement of wave crest A, only measure the peak value triggering of wave crest B and C
Voltage VB and VC.
In the cycle of oscillation of wave crest to be measured, processor 111 can set a reference voltage (shown in Figure 4 with dotted line),
And by 113 output reference voltage of device for generating voltage to comparator 114, believed by 114 comparison reference voltage of comparator and coil
Number C1 and generate a comparison result CP1.Specifically, before entering wave crest B corresponding cycle of oscillation, processor 111 can be first
Reference voltage is set in a triggering take-off potential V0_B.Then, when the level of coil signal C1 is increased over reference voltage,
After so that the output end of comparator 114 trigger signal (i.e. high potential occurs in comparison result CP1) is occurred, processor 111 is controllable
Reference voltage processed is gradually increasing.When reference voltage is increased over the level of coil signal C1, it can determine whether that trigger signal terminates
(i.e. comparison result CP1 returns to low potential), at this point, processor 111 can obtain the level of reference voltage as corresponding to wave crest B's
Peak value trigger voltage.Similarly, in wave crest C corresponding cycle of oscillation, reference voltage first can be set in one by processor 111
Take-off potential V0_C is triggered, and then obtains the peak value trigger voltage VC for corresponding to wave crest C according to same way.
Then, processor 111 can calculate one first attenuation parameter according to peak value trigger voltage and peak value trigger voltage VC
PAR1.Specifically, the first attenuation parameter PAR1 can be the average value phase of peak value trigger voltage and peak value trigger voltage VC
For the ratio of the difference of peak value trigger voltage and peak value trigger voltage VC.In one embodiment, peak value triggering electricity can be calculated
The result that is added with peak value trigger voltage VC of pressure VB divided by peak value trigger voltage and result that peak value trigger voltage VC subtracts each other and
The first attenuation parameter PAR1 is obtained, detailed calculation is as follows:
It is worth noting that, 106094041 A of Chinese patent application publication No. CN is sentenced by the variation of attenuation slope
Disconnected metallic foreign body, the i.e. variation of attenuation.However, no metallic foreign body there are in the case of, when higher (the i.e. coil of output power
Signal C1 amplitude is larger) when, the attenuation that coil interrupts after driving is larger；When lower (the i.e. coil signal C1 amplitude of output power
It is smaller) when, the attenuation that coil interrupts after driving is smaller.That is, the ratio regular meeting of attenuation and output power is roughly the same.Citing comes
Say, no metallic foreign body there are in the case of, if peak value trigger voltage be 100 unit voltage, peak value trigger voltage VC is about
For 90 unit voltages；If peak value trigger voltage is 50 unit voltage, peak value trigger voltage VC is about 45 unit voltages, the two
With different peak atenuation amounts.Therefore, the present invention is triggered using the average value or summation of peak value trigger voltage relative to peak value
The ratio of the difference (i.e. attenuation) of voltage calculates attenuation parameter, can exclude the shadow that different output power decays to coil signal
It rings, and then reaches more effective metallic foreign body judgement.In this instance, the bigger representation signal rate of decay of attenuation parameter is slower, i.e.,
Metallic foreign body there are a possibility that it is lower；The smaller representation signal rate of decay of attenuation parameter is faster, i.e., can existing for metallic foreign body
Energy property is higher.
It is furthermore noted that above-mentioned peak value trigger voltage is often not equal to the crest voltage of corresponding wave crest, in fact,
Peak value trigger voltage is slightly below the crest voltage of corresponding wave crest.As shown in Figure 4, peak value trigger voltage is close and slightly below wave
The crest voltage of peak B, peak value trigger voltage VC is approached and the crest voltage of slightly below wave crest C.Due to triggering take-off potential V0_B
And V0_C can be set separately in the voltage level of slightly below wave crest B and wave crest C, and therefore, reference voltage and coil letter after rising
Number C1 intersects on the right side of wave crest so that peak value trigger voltage and VC according to acquired by reference voltage also slightly below and close to its
Corresponding crest voltage.In addition, by the calculation of above-mentioned attenuation parameter it is found that the size of attenuation parameter is mainly attenuated
Therefore the influence of ratio is slightly below the peak value trigger voltage of crest voltage as calculating benchmark, acquired metal using numerical value
Foreign matter judging result is still approximately identical to the judging result obtained according to crest voltage.As long as attenuation parameter is able to reflect attenuation
Or attenuation ratio, that is, it can be utilized for the differentiation of metallic foreign body.
As described above, the first attenuation parameter PAR1 is equal to the result that peak value trigger voltage is added with peak value trigger voltage VC
The result subtracted each other divided by peak value trigger voltage and peak value trigger voltage VC.After obtaining the first attenuation parameter PAR1, processing
Device 111 can set one first critical value TH1, and compare the first attenuation parameter PAR1 and the first critical value TH1 to judge induction type
It whether there is metallic foreign body 3 in one electric power range of transmission of power supply unit 100.In one embodiment, when the first attenuation parameter
When PAR1 is greater than the first critical value TH1, it can determine whether that there is no metal is different in the electric power range of transmission of inductive power-supply supply device 100
Object 3；When the first attenuation parameter PAR1 is less than the first critical value TH1, then the subsequent differentiation of further progress.It is supplied in inductive power supply
It answers in system, often there is much noise in power supply or load end, it is easy to interfere the analysis and detection of coil signal, therefore, subject to
Really differentiate metallic foreign body, continuously acquirement is needed repeatedly to be judged as the data of metallic foreign body or as a result, cause to avoid noise jamming
Metallic foreign body erroneous judgement so that power supply output error be closed.
In one embodiment, processor 111 can set a basic critical value THO.In the product of inductive power-supply supply device
In test process, different product and varying environment there may be the variability of attenuation parameter, can according to there is no metallic foreign body it
Under the minimum attenuation parameter that measures set basic critical value THO.Preferably, basic critical value THO may be set to lower
Numerical value has looser discrimination standard, is mistaken for metallic foreign body to avoid noise jamming and exists.Then, processor 111
Basic critical value THO can be added different numerical value respectively and obtain multiple critical values, such as the first critical value TH1, the second critical value
TH2, third critical value TH3 etc..Processor 111 can be by the first attenuation parameter PAR1 obtained during a measurement, the second decaying
Parameter PAR2, third attenuation parameter PAR3 and the 4th attenuation parameter PAR4 respectively with the first critical value TH1, the second critical value TH2,
Third critical value TH3 and basis critical value THO are compared, to carry out the differentiation of metallic foreign body 3.For example, processor can
Basis critical value THO is set as 150, and is basis critical value TH0=150 plus 30, i.e., 180 by the first critical value TH1 setting；
Second critical value TH2 setting is that basis critical value THO=150 adds 20, i.e., 170；It is critical based on third critical value TH3 setting
Value TH0=150 adds 10, i.e., 160.Wherein, the first critical value TH1 is greater than the second critical value TH2, and the second critical value TH2 is big
In third critical value TH3.
Firstly, processor 111 compares the first attenuation parameter PAR1 and the first critical value TH1.(such as table one in one embodiment
It is shown), processor 111 can obtain that peak value trigger voltage is 1000 unit voltages and peak value trigger voltage VC is 990 units
Voltage, it is 199 that the first attenuation parameter PAR1 is obtained after being computed.Since the first attenuation parameter PAR1=199 is critical greater than first
Value TH1=180 represents it and is much larger than basic critical value THO, and therefore, processor 111 directly determines that metallic foreign body 3 is not present.
| Wave crest/cycle of oscillation | B | C | × | × | × |
| Peak value trigger voltage | 1000 | 990 | × | × | × |
| Attenuation parameter | 199 | × | × | × | |
| Critical value | 180 | 170 | 160 | 150 |
Table one
In this instance, the first attenuation parameter PAR1 is greater than the first critical value TH1 and much larger than basic critical value THO, indicates
Probability existing for metallic foreign body 3 is extremely low, belongs to very safe state, thus system is directly determined as that metallic foreign body 3 is not present.
In this case, processor 111, which only needs to measure 2 cycles of oscillation, can be completed the differentiation of metallic foreign body 3.In other words, it is driving
It only need to include 3 cycles of oscillation during the measurement that dynamic signal D1 and D2 are interrupted, wherein the cycle of oscillation corresponding to wave crest A is not
It measures, after measurement is completed within the cycle of oscillation corresponding to wave crest B and C and obtains the first attenuation parameter PAR1
Complete the differentiation of metallic foreign body 3.
In one embodiment, the first attenuation parameter PAR1 is less than the first critical value TH1, and processor 111 is further held at this time
The differentiation of row subsequent metal foreign matter 3, as shown in Table 2.
| Wave crest/cycle of oscillation | B | C | D | × | × |
| Peak value trigger voltage | 1000 | 988 | 977 | × | × |
| Attenuation parameter | 166 | 179 | × | × | |
| Critical value | 180 | 170 | 160 | 150 |
Table two
Specifically, processor 111 first compares the first attenuation parameter PAR1 and the first critical value TH1.When judgement first declines
After subtracting parameter PAR1=166 less than the first critical value TH1=180, processor 111 can measure next oscillation of coil signal C1
Period (cycle of oscillation corresponding to wave crest D).As shown in figure 5, processor 111 will can be referred to first in the cycle of oscillation of wave crest D
Voltage is set in a triggering take-off potential V0_D, and the peak value trigger voltage VD for corresponding to wave crest D is obtained according to aforesaid way.It connects
, processor 111 can calculate one second attenuation parameter PAR2 according to peak value trigger voltage VC and peak value trigger voltage VD.In detail
For, processor 111 can calculate result that peak value trigger voltage VC is added with peak value trigger voltage VD divided by peak value trigger voltage
Result that VC and peak value trigger voltage VD subtract each other and obtain the second attenuation parameter PAR2, detailed calculation is as follows:
In this instance, peak value trigger voltage VC is 988 unit voltages and peak value trigger voltage VD is 977 unit voltages, warp
It is 179 (rounding up after decimal point) that the second attenuation parameter PAR2 is obtained after calculating.Then, processor 111 joins the second decaying
Number PAR2 and the second critical value TH2 is compared, and judges that the second attenuation parameter PAR2=179 is greater than the second critical value TH2=
170.In this case, stop measuring subsequent cycle of oscillation during processor 111 measures herein, while to acquired first
Attenuation parameter PAR1 and the second attenuation parameter PAR2 are averaged, and above-mentioned average result and basis critical value THO are compared
Compared with to carry out the differentiation of metallic foreign body 3.In this instance, the average value of the first attenuation parameter PAR1 and the second attenuation parameter PAR2
Greater than basic critical value THO, therefore processor 111 judges to be not present in the electric power range of transmission of inductive power-supply supply device 100
Metallic foreign body 3.
In another embodiment, the second attenuation parameter PAR2 may also be less than the second critical value TH2, processor 111 at this time
The differentiation of subsequent metal foreign matter 3 is further executed, as shown in Table 3.
| Wave crest/cycle of oscillation | B | C | D | E | × |
| Peak value trigger voltage | 1000 | 986 | 974 | 962 | × |
| Attenuation parameter | 142 | 163 | 161 | × | |
| Critical value | 180 | 170 | 160 | 150 |
Table three
Specifically, processor 111 first compares the first attenuation parameter PAR1 and the first critical value TH1.When judgement first declines
After subtracting parameter PAR1=142 less than the first critical value TH1=180, processor 111 can measure next oscillation of coil signal C1
Period (cycle of oscillation corresponding to wave crest D) compares the second attenuation parameter PAR2 and to obtain the second attenuation parameter PAR2
Two critical value TH2.Then, after judging the second attenuation parameter PAR2=163 less than the second critical value TH2=170, processor
Next cycle of oscillation (cycle of oscillation corresponding to wave crest E) of 111 measurable coil signal C1.As shown in fig. 6, wave crest E's
In cycle of oscillation, reference voltage first can be set in a triggering take-off potential V0_E by processor 111, and be obtained according to aforesaid way
Peak value trigger voltage VE corresponding to wave crest E.Then, processor 111 can be according to peak value trigger voltage VD and peak value trigger voltage
VE calculates a third attenuation parameter PAR3.Specifically, processor 111 can calculate peak value trigger voltage VD and peak value triggering electricity
The result that pressure VE is added obtains third attenuation parameter divided by the result that peak value trigger voltage VD and peak value trigger voltage VE subtract each other
PAR3, detailed calculation are as follows:
In this instance, peak value trigger voltage VD is 974 unit voltages and peak value trigger voltage VE is 962 unit voltages, warp
It is 161 (rounding up after decimal point) that third attenuation parameter PAR3 is obtained after calculating.Then, third is decayed and is joined by processor 111
Number PAR3 and third critical value TH3 is compared, and judges that third attenuation parameter PAR3=161 is greater than third critical value TH2=
160.In this case, stop measuring subsequent cycle of oscillation during processor 111 measures herein, while to acquired first
Attenuation parameter PAR1, the second attenuation parameter PAR2 and third attenuation parameter PAR3 are averaged, and by above-mentioned average result and base
Plinth critical value THO is compared, to carry out the differentiation of metallic foreign body 3.In this instance, the first attenuation parameter PAR1, the second decaying
The average value of parameter PAR2 and third attenuation parameter PAR3 are greater than basic critical value THO, therefore processor 111 judges induction type electricity
Metallic foreign body 3 is not present in the electric power range of transmission of source power supply unit 100.
In another embodiment, third attenuation parameter PAR3 may also be less than third critical value TH3, at this time processor 111
The differentiation of subsequent metal foreign matter 3 is further executed, as shown in Table 4.
| Wave crest/cycle of oscillation | B | C | D | E | F |
| Peak value trigger voltage | 1000 | 984 | 968 | 952 | 936 |
| Attenuation parameter | 124 | 122 | 120 | 118 | |
| Critical value | 180 | 170 | 160 | 150 |
Table four
Specifically, processor 111 first compares the first attenuation parameter PAR1 and the first critical value TH1.When judgement first declines
After subtracting parameter PAR1=124 less than the first critical value TH1=180, processor 111 can measure next oscillation of coil signal C1
Period (cycle of oscillation corresponding to wave crest D) compares the second attenuation parameter PAR2 and to obtain the second attenuation parameter PAR2
Two critical value TH2.Then, after judging the second attenuation parameter PAR2=122 less than the second critical value TH2=170, processor
Next cycle of oscillation (cycle of oscillation corresponding to wave crest E) of 111 measurable coil signal C1 is to obtain third attenuation parameter
PAR3, and compare third attenuation parameter PAR3 and third critical value TH3.Then, when judging that third attenuation parameter PAR3=120 is small
After third critical value TH3=160, next cycle of oscillation that processor 111 can measure coil signal C1 (corresponds to wave crest F
Cycle of oscillation).As shown in fig. 7, reference voltage first can be set in a triggering by processor 111 in the cycle of oscillation of wave crest F
Take-off potential V0_F, and the peak value trigger voltage VF for corresponding to wave crest F is obtained according to aforesaid way.Then, processor 111 can root
According to peak value trigger voltage VE and peak value trigger voltage VF, one the 4th attenuation parameter PAR4 is calculated.Specifically, processor 111 can
The result that calculating peak value trigger voltage VE is added with peak value trigger voltage VF is divided by peak value trigger voltage VE and peak value trigger voltage
Result that VF subtracts each other and obtain the 4th attenuation parameter PAR4, detailed calculation is as follows:
In this instance, peak value trigger voltage VE is 952 unit voltages and peak value trigger voltage VF is 936 unit voltages, warp
It is 118 that the 4th attenuation parameter PAR4 is obtained after calculating.The cycle of oscillation quantity measured during being measured herein due to processor 111
It arrived predetermined quantity, therefore, processor 111 can be to the first acquired attenuation parameter PAR1, the second attenuation parameter PAR2,
Three attenuation parameter PAR3 and the 4th attenuation parameter PAR4 are averaged, and above-mentioned average result and basis critical value THO are carried out
Compare, to carry out the differentiation of metallic foreign body 3.In this instance, the first attenuation parameter PAR1, the second attenuation parameter PAR2, third decline
The average value for subtracting parameter PAR3 and the 4th attenuation parameter PAR4 is less than basic critical value THO, therefore processor 111 judges induction type
There are metallic foreign bodies 3 in the electric power range of transmission of power supply unit 100.
It in the above-described embodiments, only need to include 3~6 vibrations not etc. during the measurement that driving signal D1 and D2 are interrupted
The period is swung, the differentiation of metallic foreign body 3 can be completed.Compared to 106094041 A of Chinese patent application publication No. CN need 7~
15 not equal coil cycles of oscillation complete the measurement of four peak voltage level to judge that attenuation slope changes, of the invention
Metal foreign matter detecting method can be completed within the less time, and then shorten the time that driving signal D1 and D2 are interrupted.It is general next
It says, in the case where metallic foreign body 3 is not present and the judgement of coil signal C1 is not affected by noise jamming, the first acquired decaying
Parameter PAR1 is often much larger than basic critical value THO, only needs to measure two cycles of oscillation at this time and metallic foreign body 3 can be completed
Differentiate, and differentiate after the completion of for electric drive unit 121 and 122 can immediately bond wires to start driving signal D1 and D2, such as Fig. 3
It is shown.On the other hand, it when metal is close or noise jamming declines attenuation parameter, just needs to measure more cycles of oscillation.
In other words, the numerical value of attenuation parameter is smaller, represent metallic foreign body there are a possibility that higher, the cycle of oscillation quantity measured at this time
Also synchronous to increase.Finally no matter measure how many a cycles of oscillation or obtain how many a attenuation parameters, processor 111 is to acquired
Attenuation parameter is averaged, and average result and basis critical value THO are compared, to judge that metallic foreign body 3 whether there is.
In general, when coil stops driving, its signal is the state of natural resonance, if existing without metallic foreign body, coil signal declines
The variable quantity for subtracting slope relative to the numerical value of signal amplitude is minimum.Since each attenuation parameter is all according to the neighboring oscillation period
Peak value trigger voltage is simultaneously calculated according to same way, therefore the numerical value of attenuation parameter is quite stable.In inductive power-supply supply system
In system, the judgement of signal is necessarily influenced by power supply or circuit noise, but most power supply/circuit noises are reflected in attenuation parameter
On only will appear by a small margin numerical value bounce, at this time attenuation parameter be often much larger than aforementioned critical value without influence differentiate result.
Conversely, when metallic foreign body occurs, peak value trigger voltage meeting rapid decay, by above-mentioned addition result divided by the meter for subtracting each other result
Calculation mode, attenuation parameter meeting rapid decrease, can effectively carry out metallic foreign body detection and differentiation.
During each measurement, the vibration of measurement can be all determined according to attenuation parameter with the comparison result of corresponding critical value
Amount of cycles is swung, and obtains the average value of all attenuation parameters to carry out the differentiation of metallic foreign body.In general, when first,
When any one is greater than corresponding critical value in two and third attenuation parameter PAR1~PAR3, i.e., without last 4th decaying ginseng
The calculating of number PAR4.Since first, second and third critical value TH1~TH3 is both greater than basic critical value THO, it is not counting
In the case of calculating the 4th attenuation parameter PAR4, the average value of first three attenuation parameter PAR1~PAR3 is typically larger than basic critical value
THO and obtain the differentiation result that metallic foreign body 3 is not present.In this case, processor 111 also can determine whether acquired decaying ginseng
Number quantity or measured cycle of oscillation quantity, only when the attenuation parameter quantity of acquirement reaches preset value, (such as four declined
Subtract parameter), calculate the average value of attenuation parameter just to carry out the differentiation of metallic foreign body 3；If the attenuation parameter quantity obtained does not reach
To preset value, then processor 111 directly determines that metallic foreign body 3 is not present.
In addition, differentiating that accuracy avoids mistake to differentiate simultaneously and power supply output is caused to be closed to improve, processor 111 can be set
A fixed metallic foreign body counter.It, can will be golden if the attenuation parameter average value that obtains is less than basic critical value during a measurement
Belong to foreign matter counter and adds one.When metallic foreign body counter reaches special value within one section of scheduled period, that is, it is judged as metal
Foreign matter 3 exists.Alternatively, judgement when attenuation parameter average value is less than basic critical value can also be obtained during continuous several measurements
Metallic foreign body 3 exists.
It is worth noting that, in the above-described embodiments, a reference voltage is first set in triggering starting electricity by processor 111
Position, and control reference voltage when the output end of comparator 114 triggers and rise, then obtain at the end of triggering with reference to electricity
The level of pressure is as peak value trigger voltage.To make peak value trigger voltage effectively reflect the voltage level of corresponding wave crest, trigger
Beginning current potential should be set to close to and be slightly below the position of crest voltage, successfully to occur to trigger while keep peak value trigger voltage close
Peak voltage level.If triggering take-off potential is set to excessively high, it may occur however that triggering take-off potential can not higher than peak voltage
The case where successfully triggering；If triggering take-off potential be set to it is too low, though can successfully trigger peak value trigger voltage may it is too low and
It can not reflect true peak voltage size.
In one embodiment, processor 111 can according to previous measurement during obtain a corresponding previous peak touching
Power generation pressure subtracts a default electricity to calculate the triggering take-off potential used during this measurement, such as by previous peak trigger voltage
Numerical value obtained by pressure value is set as triggering take-off potential.For example, for the cycle of oscillation of wave crest B, if the previous measurement phase
Between the peak value trigger voltage that obtains be 1000 unit voltages, the triggering take-off potential V0_B during this measurement may be set to
900 unit voltages (i.e. 1000 subtract preset voltage value 100)；For the cycle of oscillation of wave crest C, if being obtained during previous measurement
Peak value trigger voltage VC be 980 unit voltages, this measurement during triggering take-off potential V0_C may be set to 880 units electricity
It presses (i.e. 980 subtract preset voltage value 100).According to the peak value trigger voltage during previous measurement, processor 111 is it can be seen that wave crest
The possible level of voltage will trigger take-off potential and be set in slightly lower level.The triggering take-off potential for setting lower level can
The probability triggered is improved, unless crest voltage rapid decrease, can successfully trigger in most cases and obtain gold
Belong to foreign matter judging result.
The judgment mode of the peak voltage level of 106094041 A of Chinese patent application publication No. CN is, according to previous survey
Whether there is or not the results of triggering during amount to have when judging to increase or decrease reference voltage, and occurring during several measurements
Judge that reference voltage is locked in peak voltage level in the case where when triggering and without triggering.Therefore, when load and output power
In the case of not changing, need that reference voltage can be locked to peak voltage level during multiple measurements.Mutually compared with
Under, the mode of peak value trigger voltage is obtained according to the present invention, and triggering take-off potential, which is set in lower current potential, can be improved generation
The probability of triggering, as long as triggering, which occurs, can calculate attenuation parameter at once to carry out the differentiation of metallic foreign body, therefore, the present invention without
It must spend during multiple measurements and be locked to peak voltage level, differentiation can be quickly completed.In addition, still sustainable during differentiating
Adjustment triggering take-off potential is to preferable level, for example, internal trigger take-off potential V0_B is set as 900 units electricity during this measurement
Pressing and triggering when reference voltage rises to 910 unit voltage terminates, and represents wave crest decline so that peak value trigger voltage is down to
Triggering take-off potential V0_B can be set in 810 unit voltages (i.e. during next measurement in this case by 910 unit voltages
910 subtract preset voltage value 100), to reach preferably triggering effect while improve the probability successfully triggered.
It is worth noting that, processor 111 can not obtain corresponding peak value touching during previous measurement under partial picture
Power generation pressure.For example, during previous measurement, processor 111 is according to peak value trigger voltage and peak value trigger voltage VC
Calculate the first attenuation parameter PAR1, and judge the first attenuation parameter PAR1 be greater than the first critical value TH1, thus need not measurement after
Persistent oscillation period and the other attenuation parameters of calculating.However, processor 111 judges the first decaying ginseng during this measurement
Number PAR1 needs to measure subsequent cycle of oscillation less than the first critical value TH1.In other words, domestic demand obtains correspondence during this measurement
In the triggering take-off potential V0_D of wave crest D, but during previous measurement unmeasured wave crest D cycle of oscillation, because peak value may be not present
Trigger voltage VD is as the foundation for estimating this triggering take-off potential V0_D.In this case, this survey can be used in processor 111
Another previous peak trigger voltage (the peak value trigger voltage VC for corresponding to wave crest C) conduct of previous cycle of oscillation during amount
Foundation, and the amplitude that peak value trigger voltage VC is likely lower than corresponding to the peak value trigger voltage VD of wave crest D is estimated, and then calculate touching
Send out take-off potential V0_D.For example, if peak value trigger voltage VC is 900 unit voltages, the peak value touching of wave crest D can be estimated accordingly
Power generation pressure VD is 870 unit voltages, and is set in 770 unit voltages (i.e. 870 subtract predeterminated voltage triggering take-off potential V0_D
Value 100).In another embodiment, can also according to during identical measurement peak value trigger voltage and VC estimate wave crest D's
Peak value trigger voltage VD.For example, if peak value trigger voltage is 100 unit voltages and peak value trigger voltage VC is 90 unit voltages
When, the peak value trigger voltage VD that can estimate wave crest D accordingly is located approximately at 80 unit voltages, and then will triggering take-off potential V0_D setting
It is 70 unit voltages to detect actual peak value trigger voltage VD.
In general, if the unmeasured cycle of oscillation corresponding to wave crest D, representative correspond to wave crest D during previous measurement
The record of previous peak trigger voltage may be from the measurement result before one section of long period.However, inductive power supply
Load and/or the variation of power output may occur in the power supply process of power supply unit 100, so that the peak value electricity on coil signal C1
Pressure life is widely varied, this variation may be up to tens of or hundreds times.In this case, the peak value triggering before the long period
Voltage record often do not have reference value, therefore, using identical measurement during previous cycle of oscillation peak value trigger voltage
As foundation, better suited triggering take-off potential can be obtained, and then is improved and is successfully occurred to trigger and obtain attenuation parameter and metal
The probability of foreign matter judging result.
It is worth noting that, preceding method is not that can successfully trigger during each measurement and obtain attenuation parameter.
If do not occur wherein to trigger and can not obtain corresponding peak value trigger voltage in a cycle of oscillation, processor 111 is given up
Calculating and judging result during the measurement, while being successfully triggered during reducing triggering take-off potential to improve next measurement
Probability.In addition, effectively to obtain peak value trigger voltage, processor 111 can first measuring coil resonance frequency, and obtain each humorous
The vibration period works as the position section that medium wave peak may occur.If there is no triggerings in this section, representative triggering take-off potential is excessively high,
Therefore processor 111 reduces triggering take-off potential during next measurement, and again attempts to be triggered corresponding to obtain
Peak value trigger voltage.
It can be seen from the above, the present invention can be during the measurement of drive signal interruption, measuring coil signal is to obtain correspondence
In the peak value trigger voltage of multiple peak values, and according to the average value of two adjacent peak trigger voltages relative to its difference ratio come
Attenuation parameter is calculated, and then compares attenuation parameter with corresponding critical value to decide whether that the peak value triggering that need to obtain more wave crests is electric
Pressure carries out the differentiation of metallic foreign body to execute subsequent judgement.Wherein, reference voltage can be set in a triggering and risen by processor
Beginning current potential, and control reference voltage when triggering and be gradually increasing, and then obtain peak value trigger voltage.Those skilled in the art
When can be modified or be changed accordingly, and it is without being limited thereto.For example, in the above-described embodiments, at most surveyed during a measurement
5 cycles of oscillation are measured to obtain 5 peak value trigger voltages to calculate 4 attenuation parameters.In other embodiments, above-mentioned measurement vibration
The maximum times for swinging the period and the maximum quantity for obtaining attenuation parameter can be adjusted according to system requirements, and are not limited to
This.In addition, being only example, this field skill about peak value trigger voltage and the numerical value for triggering take-off potential in the above-described embodiments
Art personnel's Ke Yi system requirements set and obtain suitable voltage value.For example, device for generating voltage 113 can be by a number
Analog converter is realized, and above-mentioned unit voltage can be digital value set by processor 111, is passed through digital simulation and is turned
Parallel operation is exported after being converted to corresponding analog voltage, according to the digital analog converter of different size, peak value triggering electricity
Pressure and triggering take-off potential may have different numerical value.For example, if the digital-to-analogue conversion that device for generating voltage 113 is 12
When device, 0~4095 digital value and the possibility voltage model according to coil signal C1 (after bleeder circuit 130) can receive
It encloses to correspond to generation output voltage.In addition, peak value trigger voltage is that reference voltage rises to triggering by triggering take-off potential and terminates
When level, and the speed that 111 adjusting reference voltage of processor rises, for example, processor 111 can control reference voltage according to solid
Fixed speed rises, and the rate of climb is adjusted to preferred values, its level at the end of triggering is enable effectively to reflect wave
The level of peak voltage.
Metal foreign matter detecting method of the invention can effectively reduce the time of drive signal interruption, interrupt driving pair to lower
The influence of power supply.Therefore, judge that the process of metallic foreign body must be completed in the shortest time as far as possible.In above-described embodiment
In, minimum needs to measure 2 cycles of oscillation and the differentiation of metallic foreign body can be completed, together with the oscillation for first wave crest given up
In the period, driving signal minimum needs to interrupt the time of three cycles of oscillation.In another embodiment, drive can still be further decreased
The time of dynamic signal interruption.
Referring to FIG. 8, Fig. 8 is the schematic diagram of another metallic foreign body testing process 80 of the embodiment of the present invention.As shown in figure 8,
Metallic foreign body testing process 80 can be used for feeder ear (the inductive power-supply supply device 100 of such as Fig. 1 of an inductive power-supply supply device
Power supply module 1) comprising following steps:
Step 800: starting.
Step 802: the corresponding previous peak trigger voltage measured during obtaining previous measurement is set as a ginseng
Examine voltage value.
Step 804: interrupting the driving signal D1 and D2 of inductive power-supply supply device 100 during a measurement to stop pair
Power supply coil 16 is driven, to generate a coil signal C1 of power supply coil 16.
Step 806: a primary peak of measuring coil signal C1 within a cycle of oscillation of coil signal C1, to obtain one
First peak value trigger voltage.
Step 808: compare the first peak value trigger voltage and reference voltage value, and judge the first peak value trigger voltage whether etc.
In or close to reference voltage value.If so, thening follow the steps 810；If it is not, thening follow the steps 812.
Step 810: judging that there is no metallic foreign bodies 3 in an electric power range of transmission of inductive power-supply supply device 100, then
Execute step 818.
Step 812: a secondary peak of measuring coil signal C1 within next cycle of oscillation of coil signal C1, to obtain
One second peak value trigger voltage.
Step 814: according to the first peak value trigger voltage and the second peak value trigger voltage, calculating an attenuation parameter.
Step 816: comparing attenuation parameter and a critical value, to judge that the electric power of inductive power-supply supply device 100 sends model
With the presence or absence of metallic foreign body 3 in enclosing.
Step 818: terminating.
Metallic foreign body testing process 80 and the difference of metallic foreign body testing process 20 are, in metallic foreign body testing process 80
In, processor 111 at least only needs a wave crest of measuring coil signal C1 during the measurement that driving signal D1 and D2 are interrupted
And a peak value trigger voltage is obtained, the differentiation of metallic foreign body 3 can be completed.
For example, referring to FIG. 9, Fig. 9 is that the embodiment of the present invention passes through a peak value trigger voltage during measurement
VB carries out the schematic diagram of metallic foreign body differentiation.As shown in figure 9, measurement during coil signal C1 only include two wave crest A and
B.Similarly, the judgement to avoid metallic foreign body 3 is driven signal D1 and D2 and influences and be distorted, and can give up the peak value touching of wave crest A
Send out voltage measurement.Then, in wave crest B corresponding cycle of oscillation, reference voltage can be set in triggering starting by processor 111
Current potential V0_B, and the peak value trigger voltage for corresponding to wave crest B is obtained according to aforesaid way.
It is worth noting that, processor 111 can first measure a corresponding previous peak triggering during previous measurement
Voltage, i.e., peak value trigger voltage corresponding to the wave crest B during previous measurement, and peak value trigger voltage is recorded as one
Reference voltage value can be stored in a memory by reference voltage value, such as processor 111.Meanwhile it only being taken during previous measurement
It obtains peak value trigger voltage and judging result instruction exists without metallic foreign body 3；Alternatively, only obtaining peak value touching during previous measurement
Power generation pressure VB and VC, calculated first attenuation parameter PAR1 are greater than the first critical value TH1 to indicate that no metallic foreign body 3 is deposited
?.Then, during this measurement, processor 111 need to obtain the peak value trigger voltage for corresponding to wave crest B, can be complete
At the differentiation of metallic foreign body 3.Specifically, processor 111 may compare peak value trigger voltage and reference voltage value, when peak value touches
When power generation pressure VB is equal or close to reference voltage value, that is, it can determine whether in the electric power range of transmission of inductive power-supply supply device 100
There is no metallic foreign bodies 3.In this case, after peak value trigger voltage measurement finishes, for electric drive unit 121 and 122
It can be re-engaged, to drive 16 output power of power supply coil again by driving signal D1 and D2.
In general, when metallic foreign body is not present and coil output power and load condition it is all constant in the case of, it is corresponding
It is also substantially constant in the peak value trigger voltage of wave crest B.On the contrary, when a metallic foreign body 3 enters inductive power-supply supply device 100
Electric power range of transmission in when, if other conditions (such as coil output power and load) are constant, peak value trigger voltage can be by gold
Belonging to foreign matter 3 influences and declines to a great extent.In this case, processor 111, which only needs to measure peak value trigger voltage, can be completed gold
Belong to the differentiation of foreign matter 3.In this way, which minimum need include 2 oscillation weeks during the measurement that driving signal D1 and D2 are interrupted
Phase, wherein the cycle of oscillation corresponding to wave crest A completes to measure and take without measurement within the cycle of oscillation corresponding to wave crest B
After obtaining peak value trigger voltage, gold can be completed with the reference voltage value previously obtained by comparing peak value trigger voltage
Belong to the differentiation of foreign matter 3.
In one embodiment, when peak value trigger voltage is judged as being equal or close to reference voltage value, sense is represented
It answers and metallic foreign body is not present in the electric power range of transmission of formula power supply unit 100.The reference of the renewable storage of processor 111 at this time
Voltage value simultaneously sets it to current peak value trigger voltage, for the differentiation during next measurement.
It is noted that the above-mentioned judgement being equal or close to can be carried out according to any way.For example, if peak value triggers
Voltage VB, which is located on reference voltage value within the scope of next special value, can be judged as that the two is equal or close, such as can set ginseng
Voltage value is examined to be considered as close to reference voltage value in the section of each 50 unit voltage up and down, and obtained during previous measurement
Reference voltage value is 1000 unit voltages.In this case, if peak value trigger voltage is located at the model of 950~1050 unit voltages
When enclosing interior, processor 111 can determine whether that peak value trigger voltage is equal or close to reference voltage value, and then judge metallic foreign body
3 are not present.In another embodiment, the numberical range on reference voltage value within next special ratios can be set to be equal to or connecing
It is bordering on, such as reference voltage value can be set and be considered as up and down close to reference voltage value in five section of each percentage, and is preceding
The reference voltage value obtained during one measurement is 500 unit voltages.In this case, if peak value trigger voltage be located at 475~
When in the range of 525 unit voltages, processor 111 can determine whether that peak value trigger voltage is equal or close to reference voltage value,
And then judge that metallic foreign body 3 is not present.
In addition, if peak value trigger voltage is judged as not being equal or close to reference voltage value during this measurement
When, there may be the output powers and/or load of metallic foreign body 3 or system to change for representative.Processor 111 need to be at this time
Next cycle of oscillation of one step surveying coil signal C1 simultaneously obtains corresponding peak value trigger voltage.Then, 111 basis of processor
The peak value trigger voltage that two adjacent cycles of oscillation measured calculates an attenuation parameter, and compares the attenuation parameter and face with corresponding
Dividing value, to carry out the differentiation of metallic foreign body 3.In other words, in metallic foreign body testing process 80, if one first peak value trigger voltage
When (such as VB) is judged as not being equal or close to reference voltage value, it need to continue to measure next cycle of oscillation to obtain one second peak
It is worth trigger voltage (VC of such as Fig. 4), with the differentiation of further progress metallic foreign body 3, above-mentioned differentiation can be by aforementioned as shown in Figure 2
Metal foreign matter detecting method 20 realize.
It is worth noting that, in certain situations, it may occur however that because coil is mobile or load while metallic foreign body 3 is close
Variation causes peak value trigger voltage to be still equal to or the case where close to reference voltage value.For avoid can not be effective under above situation
Differentiate that metallic foreign body 3, processor 111 can set peak value trigger voltage and be judged as one equal or close to reference voltage value
Read-around ratio or the upper limit of a continuous time, and executed when reaching the upper limit and measure next cycle of oscillation to obtain one second peak value
Trigger voltage (VC of such as Fig. 4) and calculate attenuation parameter, that is, pass through aforementioned metallic foreign body detection as shown in Figure 2
Method 20 carries out the differentiation of metallic foreign body 3.In one embodiment, processor 111 may include a counter, for calculating peak value
Trigger voltage is judged as the read-around ratio for being equal or close to reference voltage value thus only measuring a peak value trigger voltage,
It is changed to execute metal foreign matter detecting method 20 as shown in Figure 2 when counter reaches the upper limit, processor 111 and resets meter at this time
Number device is to recalculate read-around ratio.Alternatively, processor 111 may also comprise a timer, for judging peak value trigger voltage
It is judged as the continuous time equal or close to reference voltage value, is changed to execute metal as shown in Figure 2 when timing expires
Foreign matter detecting method 20 processor 111 and resets timer at this time to recalculate continuous time.Or the fortune of timer
Work can not also consider the differentiation result of peak value trigger voltage, for example, timer can be periodically according to fixed timing
Period running, usually can be used metal foreign matter detecting method 80 as shown in Figure 8, enforce when timing expires such as Fig. 2 institute
The metal foreign matter detecting method 20 shown.
In conclusion the present invention provides a kind of metal foreign matter detecting method, it can be in the measurement phase of drive signal interruption
In, measuring coil signal may compare peak value trigger voltage and one previously obtained to obtain one or more peak value trigger voltages
Reference voltage value carries out the differentiation of metallic foreign body, or according to the average value of two adjacent peak trigger voltages relative to its difference
Ratio calculates attenuation parameter, and then compares attenuation parameter with corresponding critical value to decide whether need to obtain the peak value of more wave crests
Trigger voltage is to execute subsequent judgement, to realize the differentiation of metallic foreign body.Reference voltage can be set in lower level by processor
One triggering take-off potential, and when triggering control reference voltage be gradually increasing, and then acquirement peak value trigger voltage.It will touching
Initiating beginning potential setting, the probability for successfully triggering and obtaining peak value trigger voltage can be improved in lower level.In addition, when metal is different
In the absence of object, metal foreign matter detecting method of the invention minimum need to measure one or two coil cycles of oscillation and correspondence take
Obtaining one or two peak value trigger voltages can be completed the differentiation of metallic foreign body.Even if in addition first wave crest without measurement,
2~3 coil cycles of oscillation are at least only included during the measurement of drive signal interruption, and drive signal interruption can be greatly reduced to electricity
The influence of power output.In addition, metal foreign matter detecting method of the invention can be judged by the attenuation ratio of coil signal,
In a manner of replacing and be judged using attenuation or attenuation slope in the past, it can solve to judge to shake vulnerable to coil according to attenuation slope
The shortcomings that width and load effect.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (25)
1. a kind of metal foreign matter detecting method, for a power supply module of an inductive power-supply supply device, which includes
One power supply coil, the metal foreign matter detecting method include:
One measurement during interrupt an at least driving signal for the inductive power-supply supply device with stop to the power supply coil into
Row driving, to generate a coil signal of the power supply coil；
Multiple wave crests of the coil signal are measured, within continuous multiple cycles of oscillation of the coil signal to obtain multiple peaks respectively
It is worth trigger voltage；
According to the one first peak value trigger voltage and one second peak value trigger voltage in multiple peak value trigger voltage, one the is calculated
One attenuation parameter；And
Compare first attenuation parameter and one first critical value, to judge an electric power range of transmission of the inductive power-supply supply device
It is interior to whether there is metallic foreign body.
2. metal foreign matter detecting method as described in claim 1, which is characterized in that according in multiple peak value trigger voltage
The first peak value trigger voltage and the second peak value trigger voltage, the step of calculating first attenuation parameter include:
Electricity is triggered relative to first peak value according to the average value of the first peak value trigger voltage and the second peak value trigger voltage
The ratio of the difference of pressure and the second peak value trigger voltage, calculates first attenuation parameter.
3. metal foreign matter detecting method as described in claim 1, which is characterized in that first attenuation parameter is equal to the first peak
The result that value trigger voltage is added with the second peak value trigger voltage is touched divided by the first peak value trigger voltage and second peak value
The result that power generation pressure is subtracted each other.
4. metal foreign matter detecting method as described in claim 1, which is characterized in that the first peak value trigger voltage is close and low
The crest voltage of a corresponding primary peak in multiple wave crest, the second peak value trigger voltage approach and are lower than multiple
The crest voltage of a corresponding secondary peak in wave crest.
5. metal foreign matter detecting method as described in claim 1, which is characterized in that in continuous multiple vibrations of the coil signal
The multiple wave crest for measuring the coil signal in the period is swung, includes: the step of multiple peak value trigger voltage to obtain respectively
Following steps are executed in the one of them of multiple cycle of oscillation:
One reference voltage is set in a triggering take-off potential；
After there is a trigger signal, controls the reference voltage and be gradually increasing；And
The level of the reference voltage at the end of the trigger signal is obtained as the peak value triggering in multiple peak value trigger voltage
Voltage.
6. metal foreign matter detecting method as claimed in claim 5, which is characterized in that in continuous multiple vibrations of the coil signal
Multiple wave crest that the coil signal is measured in the period is swung, the step of to obtain multiple peak value trigger voltage respectively further include:
The corresponding one first previous peak trigger voltage measured during obtaining previous measurement, and by first previous peak
Trigger voltage subtracts numerical value obtained by a preset voltage value and is set as the triggering take-off potential；Or
When not obtaining the corresponding first previous peak trigger voltage during the previous measurement, following steps are executed:
Obtain one second previous peak trigger voltage in the previous cycle of oscillation in multiple cycle of oscillation；
One is calculated according to the second previous peak trigger voltage estimates peak value trigger voltage；And this is estimated into peak value triggering electricity
Pressure subtracts numerical value obtained by the preset voltage value and is set as the triggering take-off potential.
7. metal foreign matter detecting method as described in claim 1, which is characterized in that compare first attenuation parameter and this first
Critical value, the step of whether there is metallic foreign body in the electric power range of transmission to judge the inductive power-supply supply device include:
When first attenuation parameter is greater than first critical value, the electric power range of transmission of the inductive power-supply supply device is judged
It is interior that metallic foreign body is not present；And
When first attenuation parameter is less than first critical value, following steps are also executed:
Obtain the third peak value trigger voltage in multiple peak value trigger voltage；
According to the second peak value trigger voltage and the third peak value trigger voltage, one second attenuation parameter is calculated；And
Compare second attenuation parameter and one second critical value.
8. metal foreign matter detecting method as claimed in claim 7, which is characterized in that first critical value is by a scheduled base
Plinth critical value is obtained plus one first numerical value, which is to be obtained by the basis critical value plus a second value,
In, which is less than first numerical value.
9. metal foreign matter detecting method as described in claim 1, which is characterized in that further include:
According to multiple peak value trigger voltage, multiple attenuation parameters are calculated；And
It is averaged to multiple attenuation parameter, whether is deposited in the electric power range of transmission to judge the inductive power-supply supply device
In metallic foreign body.
10. metal foreign matter detecting method as claimed in claim 9, which is characterized in that it is averaged to multiple attenuation parameter,
Include: with the presence or absence of the step of metallic foreign body in the electric power range of transmission to judge the inductive power-supply supply device
It obtains multiple attenuation parameter and carries out an average result that is average and generating；
Compare the average result and a basic critical value；
When the average result is greater than the basis critical value, judge in the electric power range of transmission of the inductive power-supply supply device not
There are metallic foreign bodies；And
When the average result is less than the basis critical value, the electric power range of transmission memory of the inductive power-supply supply device is judged
In metallic foreign body.
11. a kind of power supply module for an inductive power-supply supply device, for executing a metal foreign matter detecting method, the power supply
Module includes:
One power supply coil；
One resonant capacitance is coupled to the power supply coil, and for arranging in pairs or groups, the power supply coil carries out resonance；
At least one for electric drive unit, is coupled to the power supply coil and the resonant capacitance, for sending an at least driving signal extremely
The power supply coil to drive the power supply coil to generate energy, and interrupts an at least driving signal during measurement to stop
Only the power supply coil is driven, to generate a coil signal of the power supply coil；
One signal receiving module is coupled to the power supply coil, for receiving the coil signal of the power supply coil；And
One processor is coupled to the signal receiving module, for executing following steps:
Multiple wave crests of the coil signal are measured within continuous multiple cycles of oscillation of the coil signal,
To obtain multiple peak value trigger voltages respectively；
According to the one first peak value trigger voltage and one second peak value trigger voltage in multiple peak value trigger voltage, one the is calculated
One attenuation parameter；And
Compare first attenuation parameter and one first critical value, to judge an electric power range of transmission of the inductive power-supply supply device
It is interior to whether there is metallic foreign body.
12. power supply module as claimed in claim 11, which is characterized in that the processor according to the first peak value trigger voltage and
The average value of the second peak value trigger voltage is relative to the first peak value trigger voltage and the difference of the second peak value trigger voltage
Ratio, calculate first attenuation parameter.
13. power supply module as claimed in claim 11, which is characterized in that first attenuation parameter is triggered equal to first peak value
The result that voltage is added with the second peak value trigger voltage is divided by the first peak value trigger voltage and the second peak value trigger voltage
The result subtracted each other.
14. power supply module as claimed in claim 11, which is characterized in that the first peak value trigger voltage approaches and to be lower than this more
The crest voltage of a corresponding primary peak in a wave crest, the second peak value trigger voltage approach and are lower than in multiple wave crest
The crest voltage of a corresponding secondary peak.
15. power supply module as claimed in claim 11, which is characterized in that the processor executes following steps, in the coil
Multiple wave crest of the coil signal is measured in continuous multiple cycles of oscillation of signal to obtain multiple peak value triggering respectively
Voltage:
Following steps are executed in the one of them of multiple cycle of oscillation:
One reference voltage is set in a triggering take-off potential；
After there is a trigger signal, controls the reference voltage and be gradually increasing；And
The level of the reference voltage at the end of the trigger signal is obtained as the peak value triggering in multiple peak value trigger voltage
Voltage.
16. power supply module as claimed in claim 15, which is characterized in that the processor also executes following steps, in the line
Multiple wave crest of the coil signal is measured in continuous multiple cycles of oscillation of ring signal to obtain multiple peak value touching respectively
Power generation pressure:
The corresponding one first previous peak trigger voltage measured during obtaining previous measurement, and by first previous peak
Trigger voltage subtracts numerical value obtained by a preset voltage value and is set as the triggering take-off potential；Or
When not obtaining the corresponding first previous peak trigger voltage during the previous measurement, which executes following
Step:
Obtain one second previous peak trigger voltage in the previous cycle of oscillation in multiple cycle of oscillation；
One is calculated according to the second previous peak trigger voltage estimates peak value trigger voltage；And
It this is estimated into peak value trigger voltage subtracts numerical value obtained by the preset voltage value and be set as the triggering take-off potential.
17. power supply module as claimed in claim 11, which is characterized in that the processor executes following steps, with compare this
With the presence or absence of gold in one attenuation parameter and the electric power range of transmission of first critical value to judge the inductive power-supply supply device
Belong to foreign matter:
When first attenuation parameter is greater than first critical value, the electric power range of transmission of the inductive power-supply supply device is judged
It is interior that metallic foreign body is not present；And
When first attenuation parameter is less than first critical value, which also executes following steps:
Obtain the third peak value trigger voltage in multiple peak value trigger voltage；
According to the second peak value trigger voltage and the third peak value trigger voltage, one second attenuation parameter is calculated；And
Compare second attenuation parameter and one second critical value.
18. power supply module as claimed in claim 17, which is characterized in that first critical value is critical by a scheduled basis
Value obtain plus one first numerical value, which is to be added a second value by the basis critical value and obtained, wherein this
Two numerical value are less than first numerical value.
19. power supply module as claimed in claim 11, which is characterized in that the processor also executes following steps: more according to this
A peak value trigger voltage, calculates multiple attenuation parameters；And
It is averaged to multiple attenuation parameter, whether is deposited in the electric power range of transmission to judge the inductive power-supply supply device
In metallic foreign body.
20. power supply module as claimed in claim 19, which is characterized in that the processor executes following steps, to multiple
Attenuation parameter is averaged in the electric power range of transmission to judge the inductive power-supply supply device with the presence or absence of metallic foreign body:
It obtains multiple attenuation parameter and carries out an average result that is average and generating；
Compare the average result and a basic critical value；
When the average result is greater than the basis critical value, judge in the electric power range of transmission of the inductive power-supply supply device not
There are metallic foreign bodies；And
When the average result is less than the basis critical value, the electric power range of transmission memory of the inductive power-supply supply device is judged
In metallic foreign body.
21. a kind of metal foreign matter detecting method, for a power supply module of an inductive power-supply supply device, which includes
One power supply coil, the metal foreign matter detecting method include:
The corresponding previous peak trigger voltage measured during obtaining previous measurement, is set as a reference voltage value；
One measurement during interrupt an at least driving signal for the inductive power-supply supply device with stop to the power supply coil into
Row driving, to generate a coil signal of the power supply coil；
A primary peak of the coil signal is measured, within a cycle of oscillation of the coil signal to obtain the triggering of one first peak value
Voltage；
Compare the first peak value trigger voltage and the reference voltage value；And
When the first peak value trigger voltage is equal or close to the reference voltage value, the one of the inductive power-supply supply device is judged
Metallic foreign body is not present in electric power range of transmission.
22. metal foreign matter detecting method as claimed in claim 21, which is characterized in that when the first peak value trigger voltage not etc.
When the reference voltage value, the metal foreign matter detecting method is further comprising the steps of:
A secondary peak of the coil signal is measured, within next cycle of oscillation of the coil signal to obtain the touching of one second peak value
Power generation pressure；
According to the first peak value trigger voltage and the second peak value trigger voltage, an attenuation parameter is calculated；And
Compare the attenuation parameter and a critical value, whether is deposited in the electric power range of transmission to judge the inductive power-supply supply device
In metallic foreign body.
23. metal foreign matter detecting method as claimed in claim 21, which is characterized in that further include:
When the first peak value trigger voltage is equal or close to the reference voltage value, which is set equal to this
First peak value trigger voltage.
24. metal foreign matter detecting method as claimed in claim 21, which is characterized in that further include:
The first peak value trigger voltage is calculated to be judged as connecting equal or close to a read-around ratio of the reference voltage value or one
The continuous time；And
When the read-around ratio or the continuous time reaching a upper limit, following steps are executed:
A secondary peak of the coil signal is measured, within next cycle of oscillation of the coil signal to obtain the touching of one second peak value
Power generation pressure；
According to the first peak value trigger voltage and the second peak value trigger voltage, an attenuation parameter is calculated；
Compare the attenuation parameter and a critical value, whether is deposited in the electric power range of transmission to judge the inductive power-supply supply device
In metallic foreign body；And
A counter is reset to recalculate the read-around ratio, or one timer of resetting to recalculate the continuous time.
25. metal foreign matter detecting method as claimed in claim 21, which is characterized in that further include:
One timer is set, and executes following steps when the timer timing expires:
A secondary peak of the coil signal is measured, within next cycle of oscillation of the coil signal to obtain the touching of one second peak value
Power generation pressure；
According to the first peak value trigger voltage and the second peak value trigger voltage, an attenuation parameter is calculated；
And
Compare the attenuation parameter and a critical value, whether is deposited in the electric power range of transmission to judge the inductive power-supply supply device
In metallic foreign body.
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| Application Number | Priority Date | Filing Date | Title |
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| TW107114462A TWI669880B (en) | 2018-04-27 | 2018-04-27 | Method of detecting intruding metal for induction type power supply system and related supplying-end module |
| TW107114462 | 2018-04-27 |
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| CN109143386B (en) | 2020-08-07 |
| TWI669880B (en) | 2019-08-21 |
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