CN106094041A

CN106094041A - Induction type power supply and metal foreign matter detection method thereof

Info

Publication number: CN106094041A
Application number: CN201610380143.9A
Authority: CN
Inventors: 蔡明球; 詹其哲
Original assignee: Fu Da Tong Technology Co Ltd
Current assignee: Fu Da Tong Technology Co Ltd
Priority date: 2016-05-13
Filing date: 2016-06-01
Publication date: 2016-11-09
Anticipated expiration: 2036-06-01
Also published as: JP6267760B2; JP2016197997A; CN106094041B; TW201631862A; TWI577108B

Abstract

The invention discloses an induction type power supply and a metal foreign matter detection method thereof, which are used for detecting whether metal foreign matters exist in a power transmission range of the induction type power supply. The method comprises interrupting at least one driving signal of the inductive power supply to stop driving a power supply coil of the inductive power supply; obtaining a first attenuation slope in a first period of the stop driving of the power supply coil, and obtaining a second attenuation slope in a second period of the stop driving of the power supply coil; and judging whether metal foreign matters exist in the power transmission range of the induction type power supply according to the first attenuation slope and the second attenuation slope.

Description

Inductive power-supply supply device and metal foreign matter detecting method thereof

Technical field

The present invention relates to a kind of method for inductive power-supply supply device, particularly relate to one and can detect inductive power supply The method that whether there is metallic foreign body in the electric power range of transmission of supply.

Background technology

Inductive power-supply supply device includes feeder ear and receiving end, and feeder ear promotes power coil to produce by drive circuit Resonance, and then send radio frequency electromagnetic, then by electrically changing after the coil reception electromagnetic wave energy of receiving end, to produce DC source is supplied to receiving end device.In general, coil two sides all can send and receive electromagnetic wave, therefore the non-sense of coil Answering face often to install magnetic material additional, make electromagnetic energy concentrate on sensing side, magnetic material is close to coil can strengthen coil electricity Sensibility reciprocal, and then promote electromagnetic induction ability.If it addition, electromagnetic energy puts on metallic object, it can be produced heats, its Principle is identical with electromagnetic oven.Therefore, another effectiveness of magnetic material is to intercept electromagnetic energy, to avoid it to disturb coil rear end The running of device, avoid simultaneously electromagnetic energy to arround metal produce heat effect and cause danger.

In inductive power-supply supply device, feeder ear and receiving end carry out electric power and control signal by coil-induced respectively Transmission, safety is necessary Consideration.But, when reality is applied, user may be either intentionally or unintentionally two senses Answer insertion metallic foreign body between coil.If there is metallic foreign body in power supply process, it can be made by the electromagnetic energy that coil produces Become huge heat effect, and occur burning or blast etc. unexpected.Therefore, industry pays much attention to this safe subject under discussion, and relevant business Product must possess the ability whether detecting metallic foreign body exists, and in the presence of metallic foreign body, needs to close power supply and exports to carry out Protection.

Prior art is to be received the measurement of power by feeder ear output and receiving end, carries out the meter of power attenuation Calculate, and judged with predetermined critical by the power attenuation calculated, if power attenuation exceedes marginal value, be then determined as There is metallic foreign body.But, the method for above-mentioned differentiation metallic foreign body is often unable to reach and is effectively protected function, such as, when firmly When the metallic foreign body that coin, key or paperclip equal-volume are less exists in the electric power range of transmission of feeder ear, said method may Cannot effectively differentiate out.If by differentiate critical value setting must more rigorous time, small noise jamming i.e. may be mistaken for Metallic foreign body, causes unnecessary power-off.In consideration of it, the real necessity having improvement of prior art.

Summary of the invention

Therefore, the main object of the present invention is i.e. to provide a kind of electric power detecting inductive power-supply supply device to send model Whether there is method and the inductive power-supply supply device thereof of metallic foreign body in enclosing, to realize the detecting of more effective metallic foreign body, enter And promote the protected effect of vicarious power supply unit.

The invention discloses a kind of method for an inductive power-supply supply device, be used for detecting this inductive power-supply supply Whether metallic foreign body is there is in one electric power range of transmission of device.The method includes interrupting at least the one of this inductive power-supply supply device Drive signal, to stop a power coil of this inductive power-supply supply device is driven；Stop driving at this power coil In a first period in, obtain one first attenuation slope, and this power coil stop drive in a second phase in, take Obtain one second attenuation slope；And judge this inductive power-supply supply according to this first attenuation slope and this second attenuation slope Whether metallic foreign body is there is in this electric power range of transmission of device.

The invention also discloses a kind of inductive power-supply supply device, it includes a supply module, and this supply module includes one Power coil, a resonant capacitance, at least one confession electric drive unit and a processor.This resonant capacitance is coupled to this power coil, This power coil that can be used to arrange in pairs or groups carries out resonance.This at least one confession electric drive unit is coupled to this power coil and this resonance electricity Hold, can be used to send at least one and drive signal to this power coil, to drive this power coil to produce energy, and interrupt this at least One drives signal to stop being driven this power coil.This processor can be used to the coil letter receiving on this power coil Number, and perform following steps: within the first period that this power coil stops in driving, obtain one first attenuation slope, and Within the second phase that this power coil stops in driving, obtain one second attenuation slope；And according to this first decay tiltedly Whether rate and this second attenuation slope exist metallic foreign body in judging this electric power range of transmission of this inductive power-supply supply device.

The invention also discloses a kind of method for an inductive power-supply supply device, be used for detecting this inductive power supply and supply Whether metallic foreign body is there is in answering an electric power range of transmission of device.The method includes interrupting this inductive power-supply supply device at least One drives signal, to stop being driven a power coil of this inductive power-supply supply device；Set a reference voltage level； This power coil stop drive time, detect a coil signal of this power coil, with obtain this coil signal double on Increase above the time point of this reference voltage level；This reference voltage level is risen above according to this coil signal is double Time point, obtain this coil signal this power coil stop drive time one cycle of oscillation length；And according to this vibration Cycle Length, obtains one attenuation slope of this coil signal when this power coil stops driving.

Accompanying drawing explanation

Fig. 1 is the schematic diagram of the embodiment of the present invention one inductive power-supply supply device.

Fig. 2 is the schematic diagram that the embodiment of the present invention one metallic foreign body judges flow process.

Fig. 3 is the waveform diagram of the power coil running of embodiment of the present invention inductive power-supply supply device.

Fig. 4 is the waveform signal that the embodiment of the present invention judges coil signal attenuation slope when power coil stops and driving Figure.

Fig. 5 be the embodiment of the present invention in the presence of metallic foreign body, power coil stop drive time judge coil The waveform diagram of signal attenuation slope.

Fig. 6 be the embodiment of the present invention in the presence of band large-scale metal foreign body, power coil stop drive time judge The waveform diagram of coil signal attenuation slope.

Fig. 7 is when power coil stops and driving, another embodiment of the present invention judges that the waveform of coil signal attenuation slope shows It is intended to.

Fig. 8 is the schematic diagram that the embodiment of the present invention one crest voltage judges flow process.

Fig. 9 is the schematic diagram that the embodiment of the present invention one metallic foreign body judges detailed process.

Figure 10 is the schematic diagram of another inductive power-supply supply device of the embodiment of the present invention.

Figure 11 be Figure 10 inductive power-supply supply device in power coil stop drive time judge coil signal attenuation slope Waveform diagram.

Wherein, description of reference numerals is as follows:

100,100 ' inductive power-supply supply device

1 supply module

111 processors

112 clock generators

113,114 for electric drive unit

115 resonant capacitances

116 power coil

117,217 magnetic conductor

130 bleeder circuits

131,132 divider resistance

M1～M4, M1 ', M2 ' comparator module

141,142,143,144 comparator

151,152,153,154 digital analog converter

C1 coil signal

D1, D2 drive signal

V1～V4 peak voltage level

CR1～CR4 comparative result

V_ref reference voltage level

2 by electricity module

21 load units

216 electricity reception coil

3 metallic foreign bodies

20 metallic foreign bodies judge flow process

200～214 steps

A, B, C time interval

T1, t2 time point

80 crest voltages judge flow process

800～824 steps

90 metallic foreign bodies judge detailed process

900～918 steps

Detailed description of the invention

Refer to the schematic diagram that Fig. 1, Fig. 1 are the embodiment of the present invention one inductive power-supply supply device 100.As it is shown in figure 1, sense A supply module 1 and one is subject to electricity module 2 to answer formula power supply unit 100 to include.Supply module 1 includes a power coil 116 and Resonant capacitance 115.Wherein, power coil 116 can be used to send electromagnetic energy to by electricity module 2 to be powered, resonant capacitance 115 are coupled to power coil 116, and the power coil 116 that can be used to arrange in pairs or groups carries out resonance.Additionally, in supply module 1, optional Property ground use the magnetic conductor 117 that constituted of magnetic material, be used for promoting the electromagnetic induction ability of power coil 116, keep away simultaneously Exempt from electromagnetic energy and affect the object in direction, coil non-inductive face.

For controlling power coil 116 and the running of resonant capacitance 115, supply module 1 also includes a processor 111, for the moment Clock generator 112, for electric drive unit 113 and 114, one bleeder circuit 130 and comparator module M1～M4.For electric drive unit 113 and 114 are coupled to power coil 116 and resonant capacitance 115, can send respectively driving signal D1 and D2 to power coil 116, It can receive the control of processor 111, in order to drive power coil 116 produce and send energy.For electric drive unit 113 and When operating both 114, full-bridge driving can be carried out simultaneously.In some embodiments, it is possible to only open for electric drive unit 113 and 114 one of which, or only arranging one supplies electric drive unit 113 or 114, to carry out half-bridge driven.Clock generator 112 coupling Be connected to for electric drive unit 113 and 114, can be used to control to send for electric drive unit 113 and 114 drive signal D1 and D2 or in Disconnected driving signal D1 and D2.Clock generator 112 can be a pulse width modulation generator (Pulse Width Modulation generator, PWM generator) or other type of clock generator, it is used for exporting a clock signal To for electric drive unit 113 and 114.Processor 111 can receive coil signal C1 (the i.e. power coil 116 on power coil 116 And the voltage signal between resonant capacitance 115) relevant information, and judge inductive power-supply supply device according to coil signal C1 A metallic foreign body 3 whether is there is in the electric power range of transmission of 100.Bleeder circuit 130 includes divider resistance 131 and 132, and it can be right After coil signal C1 on power coil 116 decays, it is output to processor 111 and comparator module M1～M4. In some embodiments, if processor 111 and the circuit such as comparator module M1～M4 have enough pressure, it is possible to do not use point Volt circuit 130, is directly received the coil signal C1 on power coil 116 by processor 111.Additionally, comparator module M1～M4 It is made up of a comparator and a digital analog converter (Digital to Analog Converter, DAC) respectively, available Carry out the peak value of tracking coil signal C1.The composition assembly possible as other or module, such as power supply unit, display unit etc., can Viewing system demand and be increased or decreased, therefore under the explanation not affecting the present embodiment, slightly do not show.

Please continue to refer to Fig. 1.An electricity reception coil 216 is included, its confession that can be used to receive power coil 116 by electricity module 2 Electricity.By in electricity module 2, it is possible to optionally use the magnetic conductor 217 that magnetic material is constituted, to promote electricity reception coil The electromagnetic induction ability of 216, avoids electromagnetic energy to affect the object in direction, coil non-inductive face simultaneously.Electricity reception coil 216 also will The electric power received is sent to the load unit 21 of rear end.In being subject to electricity module 2, other possible composition assemblies or module, as Mu balanced circuit, resonant capacitance, rectification circuit, signal feedback circuit, receiving end processor etc., visible system demand and increase and add deduct Few, therefore under the explanation not affecting the present embodiment, slightly do not show.

Being different from prior art, feeder ear and receiving end need to carry out power measurement, to be sentenced by power attenuation simultaneously Disconnected metallic foreign body, the present invention has only to carry out the interpretation of coil signal at feeder ear, i.e. can determine whether that the electric power of power coil sends In the range of whether there is metallic foreign body.Refer to Fig. 2, Fig. 2 is the signal that the embodiment of the present invention one metallic foreign body judges flow process 20 Figure.As in figure 2 it is shown, metallic foreign body judges that flow process 20 can be used for the feeder ear (vicarious such as Fig. 1 of an inductive power-supply supply device The supply module 1 of power supply unit 100), it comprises the following steps:

Step 200: start.

Step 202: interrupt driving signal D1 and D2 of inductive power-supply supply device 100, to stop entering power coil 116 Row cutting.

Step 204: set a reference voltage level V_ref.

Step 206: when power coil 116 stops driving, the coil signal C1 of detecting power coil 116, to obtain line The double time point rising above reference voltage level V_ref of ring signal C1.

Step 208: according to the double time point rising above reference voltage level V_ref of coil signal C1, take Coil signal C1 power coil 116 stop drive time one cycle of oscillation length.

Step 210: according to length cycle of oscillation, within the first period that power coil 116 stops in driving, obtain one First attenuation slope, and within the second phase that power coil 116 stops in driving, obtain one second attenuation slope.

Step 212: judge the electric power of inductive power-supply supply device 100 according to the first attenuation slope and the second attenuation slope Metallic foreign body 3 whether is there is in range of transmission.

Step 214: terminate.

Judge flow process 20 according to metallic foreign body, in the supply module 1 of inductive power-supply supply device 100, drive signal D1 And D2 can interrupt a period of time during driving, now, can stop power coil 116 is entered for electric drive unit 113 and 114 Row cutting (step 202).In general, when power coil 116 driven, exported for electric drive unit 113 and 114 Driving signal D1 and D2 is the most anti-phase square wave, and in the case, the coil signal C1 on power coil 116 can present stable Vibration up and down, its frequency of oscillation equal to drive signal D1 and D2 frequency, as shown in the time interval A of Fig. 3.Above-mentioned oscillation frequency Rate can be controlled by processor 111 or clock generator 112.When power coil 116 stops driving, because of power coil 116 with Still suffering from energy between resonant capacitance 115, coil signal C1 may proceed to vibration and gradually decays.The time interval B of Fig. 3 depicts Coil signal C1 carries out the situation of damped oscillation, when driving signal D1 and D2 to interrupt, originally with the driving of square output Signal D1 and D2 rests on electronegative potential simultaneously and stops driving power coil 116, and now, coil signal C1 starts decay and continues Vibration, its frequency of oscillation can be arranged in pairs or groups produced inductance value L by power coil 116 and resonant capacitance 115 and capacitance C comes certainly Fixed, i.e.

f_{0} = \frac{1}{2 π \sqrt{L C}}

Then, reference voltage level V_ref (step 204) can be set, for example, reference voltage level V_ref can Preset by system or be set by processor 111.When power coil 116 stops driving, processor 111 can detect confession The coil signal C1 of electric coil 116, with obtain coil signal C1 double rise above reference voltage level V_ref time Between point (step 206).In general, reference voltage level V_ref may be set to equal or close to zero potential.Further, Processor 111 can obtain line according to the double time point rising above reference voltage level V_ref of coil signal C1 Ring signal C1 stops the length cycle of oscillation (step 208) when driving at power coil 116.That is, as reference voltage level V_ Ref is close to (close to zero potential) during the medium voltage of coil signal C1, and coil signal C1 is double rises above ginseng The distance of the time point examining voltage level V_ref can be equal to length cycle of oscillation of coil signal C1.According to length cycle of oscillation, Processor 111 can obtain one first attenuation slope within the first period that power coil 116 stops in driving, and in power supply Coil 116 stops, in the second phase in driving, obtaining one second attenuation slope (step 210), and wherein, the second phase is positioned at After first period.Processor 111 can judge inductive power-supply supply according to the first attenuation slope and the second attenuation slope Metallic foreign body 3 (step 212) whether is there is in the electric power range of transmission of device 100.Then, in the time interval C of Fig. 3, can lead to Cross phase shift system or conversion system restarts driving signal D1 and D2, to avoid the amplitude moment of coil signal C1 to be substantially increased And cause circuit unit to burn.

If there is not metallic foreign body in it should be noted that the electric power range of transmission of inductive power-supply supply device 100, line Ring signal C1 can Natural Attenuation persistent oscillation, its signal attenuation slope meeting in the case of driving signal D1 and D2 to interrupt driving Remain fixing.On the other hand, if there is metallic foreign body in the electric power range of transmission of inductive power-supply supply device 100, coil is believed Number C1 in the case of driving signal D1 and D2 to interrupt driving also can continuous decrement, but decay behavior is different from the former.Come in detail Saying, in the presence of metallic foreign body, coil signal C1 can first decay with bigger slope, and attenuation slope can be gradually reduced.

If the attenuation slope of coil signal C1 to be obtained, need to first obtain crest location and the peak value thereof of coil signal C1, with Judge the decay of peak value.In the period (such as the time interval A of Fig. 3) of power coil 116 driven, the cycle of coil signal C1 Can be controlled by driving signal D1 and D2 with frequency, i.e. the cycle of coil signal C1 can synchronize with driving signal D1 and D2.? Under this situation, processor 111 can obtain the crest location of coil signal C1, its Detailed Operation side within each coil drive cycle Formula is recorded in Chinese patent application case 201610296710.2.But, in the period that power coil 116 stops driving (such as Fig. 3 Time interval B), the cycle of coil signal C1 self-resonance and frequency are to be determined by winding inductance quantity and resonant capacitance.General next Saying, often there is a certain degree of error in the resonant capacitance 115 that supply module 1 is used, thus cannot obtain electric capacity accurately Value.Additionally, the inductance value of power coil 116 also can exist certain error, and reality produces the inductance value of vibration on coil May be affected by extraneous factors such as magnetic conductor 117, metallic foreign body or loads and difference is occurred.In this case, it is difficult to pass through Theoretic computing obtains the actual frequency carrying out vibrating of coil signal C1.Therefore, the present invention is according to reference voltage level V_ The setting of ref, obtains the double time point rising above reference voltage level V_ref of coil signal C1, and accordingly Obtain length cycle of oscillation of coil signal C1.

Refer to Fig. 4, Fig. 4 is when power coil 116 stops and driving, the embodiment of the present invention judges that coil signal C1 decays The waveform diagram of slope.Fig. 4 draws coil signal C1, drives signal D1 and D2 and comparative result CR1～CR4.Wherein, than Relatively result CR1～CR4 are respectively comparator module M1～the output of M4 in Fig. 1.When power coil 116 stops driving, drive Signal D1 and D2 rests on electronegative potential.Now, can to first pass through comparator module M1 continuous to obtain coil signal C1 for processor 111 Rise above the time point of reference voltage level V_ref for twice.As it has been described above, reference voltage level V_ref is preferably set Near zero potential, this is because coil signal C1 is ac signal, can vibrate up and down at positive voltage and negative voltage.DANGSHEN Examining voltage level V_ref when being zero potential, coil signal C1 will necessarily pass through reference voltage level V_ref.Comparator module M1 Including comparator 141 and a digital analog converter 151.Specifically, processor 111 exportable reference voltage level V_ The digital value of reference voltage level V_ref is converted to mould to digital analog converter 151, digital analog converter 151 by ref again After intending voltage, comparator 141 analog voltage of reference voltage level V_ref is compared with coil signal C1.Therefore, The exportable square-wave signal of comparator 141 is to processor, and the rising edge of this square-wave signal i.e. can be mapped to coil signal C1 and rises To the time point exceeding reference voltage level V_ref.Furthermore, processor 111 can be in one first harmonic period, online Ring signal C1 rises above an initial intervalometer (such as the time point t1 of Fig. 4) on the time point of reference voltage level V_ref.Connect , adjacent in one second harmonic period of the first harmonic period, processor 111 can rise above ginseng at coil signal C1 Examine and on the time point of voltage level V_ref, stop this intervalometer (such as the time point t2 of Fig. 4).Consequently, it is possible to the timing of intervalometer Period can be set to length cycle of oscillation of coil signal C1.It should be noted that those skilled in the art should understand, The mode obtaining coil signal C1 frequency above by comparator module M1 is only in the middle of the numerous embodiment of the present invention Kind, in other embodiments, it is possible to carried out length cycle of oscillation of detection lines ring signal C1 by comparator module M2, M3 or M4.

Obtaining the cycle of oscillation of coil signal C1 after length, processor 11 can be further according to above-mentioned comparator module The judged result of M1 obtains the crest location in each harmonic period, and sets peak voltage level V1～V4 to follow the trail of peak value Voltage.As shown in Figure 4, when power coil 116 stops driving, coil signal C1 can Natural Attenuation persistent oscillation.Now, Comparator module M1～M4 can follow the trail of peak value at four diverse locations respectively.

Specifically, in the supply module 1 of inductive power-supply supply device 100, drive signal D1 and D2 pre-every one section Fix time and can interrupt once, and the time span that can set interruption is equal to a predetermined value, as a example by Fig. 4, drives signal D1 and D2 The time span interrupted about is available for coil signal C1 and vibrates voluntarily 15 cycles.It is preferred that when driving signal D1 and D2 to interrupt And after stopping driving power coil 116, processor 111 can obtain coil signal C1 in the 2nd to the 3rd cycle of oscillation and rise To exceeding the time point of reference voltage level V_ref, and then obtain length cycle of oscillation of coil signal C1, and calculate follow-up Crest location in each cycle.In other embodiments, it is possible within other cycle of oscillation, carry out the judgement of Cycle Length.Connect , in power coil 116 stops the period driving, comparator module M1～M4 can be taken off the coil signal of power coil 116 Multiple peak values of C1 vibration, and these multiple peak values are stopped with a front power coil 116 respectively the multiple ripples produced when driving A peak voltage level corresponding in peak voltage level compares.Wherein, each comparator module M1～M4 can be corresponding To a peak value and a peak voltage level, and it is used for comparing this peak value and this peak voltage level.Therefore, it is used for carrying out differentiating The quantity of peak voltage level can be equal to the quantity of comparator module, the number of peaks also can taken out equal to comparator module, its In, each peak voltage level is respectively intended to follow the trail of the voltage of each peak value.In this instance, comparator module M1～M4 can use altogether Take out four peak values, and use four peak voltage level V1～V4 to be tracked.

Please continue to refer to Fig. 4, when processor 111 obtain coil signal C1 cycle of oscillation length and crest location with After, comparator module M1～M4 can take out after coil signal C1 stops driving the 7th, the 8th, the 12nd and the 13rd cycle of oscillation respectively In peak value, as shown in Figure 4.A front power coil 116 can be stopped the peak voltage level updated when driving by processor 111 V1～V4 is separately input to comparator module M1～M4, compares for comparator module M1～M4.Specifically, previous Stage is used for comparator module M1 of comparator coil signal C1 and reference voltage level V_ref, now can be used to compare crest electricity 7th peak value of voltage level V1 and coil signal C1.Wherein, digital analog converter 151 can receive crest electricity from processor 111 The digital value of voltage level V1, then after being converted into analog voltage, by comparator 141 by the simulation electricity of peak voltage level V1 Pressure compares with coil signal C1, and exports comparative result CR1.Then, processor 111 can be according to comparative result CR1, it is judged that Whether the 7th peak value of coil signal C1 arrives peak voltage level V1.When this peak value arrives peak voltage level V1, process Device 111 can improve the numerical value of peak voltage level V1；When this peak value does not arrives peak voltage level V1, processor 111 can drop The numerical value of low peak voltage level V1.Consequently, it is possible to after peak voltage level V1 sustainable tracking coil signal C1 stops driving The voltage of the 7th peak value.

In like manner, comparator module M2 can be used to compare the 8th peak value of peak voltage level V2 and coil signal C1.Relatively Device module M2 includes comparator 142 and a digital analog converter 152.Digital analog converter 152 can connect from processor 111 Receive the digital value of peak voltage level V2, then after being converted into analog voltage, by comparator 142 by peak voltage level V2 Analog voltage compare with coil signal C1, and export comparative result CR2.Then, processor 111 can be according to comparative result CR2, it is judged that whether the 8th peak value of coil signal C1 arrives peak voltage level V2.When this peak value arrives peak voltage level During V2, processor 111 can improve the numerical value of peak voltage level V2；When this peak value does not arrives peak voltage level V2, process Device 111 can reduce the numerical value of peak voltage level V2.Consequently, it is possible to peak voltage level V2 sustainable tracking coil signal C1 stops The voltage of the 8th peak value after only driving.Comparator module M3 can be used to compare the of peak voltage level V3 and coil signal C1 12 peak values.Comparator module M3 includes comparator 143 and a digital analog converter 153.Digital analog converter 153 can The digital value of peak voltage level V3 is received from processor 111, then after being converted into analog voltage, will by comparator 143 The analog voltage of peak voltage level V3 compares with coil signal C1, and exports comparative result CR3.Then, processor 111 Can be according to comparative result CR3, it is judged that whether the 12nd peak value of coil signal C1 arrives peak voltage level V3.When this peak value arrives When reaching peak voltage level V3, processor 111 can improve the numerical value of peak voltage level V3；When this peak value does not arrives peak voltage During level V3, processor 111 can reduce the numerical value of peak voltage level V3.Chase after consequently, it is possible to peak voltage level V3 is sustainable The voltage of the 12nd peak value after track coil signal C1 stopping driving.Comparator module M4 can be used to compare peak voltage level V4 and 13rd peak value of coil signal C1.Comparator module M4 includes comparator 144 and a digital analog converter 154.Numeral Analog converter 154 can receive the digital value of peak voltage level V4 from processor 111, then be converted into analog voltage with After, comparator 144 analog voltage of peak voltage level V4 is compared with coil signal C1, and export comparative result CR4.Then, processor 111 can be according to comparative result CR4, it is judged that whether the 13rd peak value of coil signal C1 arrives crest electricity Voltage level V4.When this peak value arrives peak voltage level V4, processor 111 can improve the numerical value of peak voltage level V4；When When this peak value does not arrives peak voltage level V4, processor 111 can reduce the numerical value of peak voltage level V4.Consequently, it is possible to ripple The voltage of the 13rd peak value after peak voltage level V4 sustainable tracking coil signal C1 stopping driving.

In above-mentioned peak value judge process, peak voltage level V1～V4 after renewal is storable in processor 111 Depositor, for judging next time to use.Consequently, it is possible to when power coil 116 each time stops driving, processor 111 all can Update peak voltage level V1～V4 according to comparative result CR1～CR4, make peak voltage level V1～V4 keep track coil The crest voltage of signal C1.Therefore, when peak voltage level V1～V4 can follow the trail of corresponding crest voltage smoothly, process Device 111 can obtain the attenuation slope of coil signal C1 by peak voltage level V1～V4.

Further, owing to peak voltage level V1～V4 is used to the crest voltage of tracking coil signal C1, at crest Can be considered the crest voltage of coil signal C1 when voltage level V1～V4 stablizes, therefore, processor 111 can be according to crest electricity Voltage level V1～V4 calculates the first attenuation slope and the second attenuation slope.Specifically, processor 111 can be by peak voltage electricity The difference of flat V1 and peak voltage level V2 is divided by distance (i.e. 1 vibration of coil signal C1 of the 7th crest and the 8th crest Cycle Length), to calculate the first attenuation slope, and by the difference of peak voltage level V3 and peak voltage level V4 divided by the 12nd The distance of individual crest and the 13rd crest 1 of coil signal C1 (i.e. cycle of oscillation length), to calculate the second attenuation slope. As it has been described above, when power coil 116 stops driving, coil signal C1 can produce in the case of non-existent in metallic foreign body existence Raw different decay behavior.Wherein, when metallic foreign body not in the presence of, the attenuation slope of coil signal C1 can remain fixing；Work as gold In the presence of belonging to foreign body, coil signal C1 can first decay with bigger slope, and attenuation slope can be gradually reduced.Judge at above-mentioned peak value During, processor 111 can obtain the 7th and the 8th crest voltage in coil signal C1 decay early stage, and then acquirement first declines Subtract slope；And obtain the 12nd and the 13rd crest voltage in the coil signal C1 decay later stage, and then obtain the second attenuation slope. In one embodiment, a metallic foreign body can be set and judge accumulator, as the index judging metallic foreign body.When coil signal C1 declines Subtract the first attenuation slope of early stage and deduct numerical value obtained by second attenuation slope in decay later stage more than (generation during first marginal value Table early stage attenuation slope is bigger), processor 111 can determine whether that metallic foreign body exists, and improve metallic foreign body and judge the number of accumulator Value；Otherwise, when coil signal C1 decay early stage the first attenuation slope deduct decay the later stage the second attenuation slope obtained by number Value is less than (representing attenuation slope almost unchanged) during first marginal value, and processor 111 can determine whether that metallic foreign body does not exists, and drops Low metallic foreign body judges the numerical value of accumulator.Further, judge that the numerical value of accumulator is persistently added to exceed when metallic foreign body During one second marginal value, it is different to there is metal in i.e. can determine whether the electric power range of transmission of inductive power-supply supply device 100 in processor 111 Thing, and then perform power-off or other protective measure.

As shown in Figure 4, when power coil 116 stops driving (i.e. drive signal D1 and D2 interrupt), coil signal C1 with Fixing slope Natural Attenuation, represents the non-existent situation of metallic foreign body.

Refer to Fig. 5, Fig. 5 be the embodiment of the present invention in the presence of metallic foreign body, power coil 116 stop drive The waveform diagram of coil signal C1 attenuation slope is judged time dynamic.Similarly, Fig. 5 also includes coil signal C1, drives signal D1 And D2 and comparative result CR1～CR4.From the waveform of Fig. 5 coil signal C1, coil signal C1 can be first with bigger oblique Rate decays, and attenuation slope is gradually reduced, and represents the situation that metallic foreign body exists.It is noted that the existence meeting of metallic foreign body Affect the frequency of oscillation of coil signal C1, when power coil 116 stops driving the most each time, be required for judging coil signal C1 The double time point rising above reference voltage level V_ref, and then obtain this power coil 116 and stop the driving phase Between use length cycle of oscillation.The time stopping driving due to each power coil 116 is extremely short, in very short time, visually Will not change for power coil 116 frequency of oscillation.

Refer to Fig. 6, Fig. 6 be the embodiment of the present invention in the presence of band large-scale metal foreign body, stop at power coil 116 The waveform diagram of coil signal C1 attenuation slope is judged when only driving.Similarly, Fig. 6 also includes coil signal C1, drives letter Number D1 and D2 and comparative result CR1～CR4.The interior existence of electric power range of transmission that Fig. 6 draws inductive power-supply supply device 100 is big The situation of type metallic foreign body.From the waveform of Fig. 6 coil signal C1, coil signal C1 can first decay with bigger slope, And attenuation slope reduces rapidly.Compared to the situation of Fig. 5, in the embodiment in fig 6, the first attenuation slope and the second attenuation slope Bigger difference can be there is, in representing the electric power range of transmission of inductive power-supply supply device 100, there is bigger metallic foreign body, tool There is higher danger.

In one embodiment, above-mentioned metallic foreign body judge accumulator value adjustment mode can along with the first attenuation slope and The difference number of the second attenuation slope is adjusted.If it is to say, the first attenuation slope deducts the number of the second attenuation slope When being worth bigger, processor 111 judges the numerical value of accumulator to improve metallic foreign body by a relatively large margin；If the first attenuation slope deducts The numerical value of two attenuation slopes is less but during still above the first marginal value, processor 111 judges improving metallic foreign body more by a small margin The numerical value of accumulator.By such mode, the band large-scale metal foreign body with high risk can make metallic foreign body judge accumulator It is rapidly reached the second marginal value and makes the rapid power-off of inductive power-supply supply device 100.Additionally, the noise of slightly affected attenuation slope is also It is difficult to significantly alter metallic foreign body and judges that the numerical value of accumulator causes the power-off of mistake.

It should be noted that the present invention can follow the trail of crest voltage by peak voltage level, and use peak voltage electricity Put down the attenuation slope obtaining coil signal, to judge the decay behavior of coil signal, and then judge inductive power-supply supply device Electric power range of transmission in whether there is metallic foreign body.In this case, need judge the position of crest exactly and take out Peak value.But, owing to the speed of coil signal vibration is exceedingly fast, and vibrate each time all with a certain degree of decay, additionally, In the case of drive signal interruption, the frequency of coil signal vibration is often different from and drives the frequency of signal cannot be controlled by place Reason device.Therefore, when coil signal vibration at a high speed, general analog-digital converter (Analog to Digital Converter, ADC) sample rate there is certain sampling time the soonest and often, thus be difficult to take out exactly coil The peak value of signal.In the case, whether the present invention carrys out tracking coil signal by comparator module, and surpass according to coil signal Cross peak voltage level to adjust the numerical value of peak voltage level, make peak voltage level keep track the specific peak of coil signal Value, and along with the comparative result of comparator module is finely adjusted.Consequently, it is possible to the present invention can be effectively according to peak voltage electricity Put down the decay behavior judging coil signal, and then whether there is gold in judging the electric power range of transmission of inductive power-supply supply device Belong to foreign body.

Further, due to the crest voltage that peak voltage level is not actual, therefore, in some circumstances, particularly When the load of inductive power-supply supply device changes or occurs that metallic foreign body disturbs, and when causing coil signal instability, ripple Peak voltage level may be not equal to crest voltage.Specifically, when coil signal instability, a crest voltage may be on moment Rise so that corresponding peak voltage level is less than this crest voltage and both exist certain distance, now, peak voltage level Need to rise repeatedly continuously, to catch up with the size of crest voltage.In this case, the phase driven is stopped at continuous several times power coil Between, this peak value all arrives corresponding peak voltage level (i.e. comparative result is to trigger) so that peak voltage level needs Persistently rise, and correct crest voltage cannot be obtained during peak voltage level persistently rises, can temporarily cease and hold The above-mentioned step judging metallic foreign body according to attenuation slope of row.Similarly, when coil signal instability, a crest voltage can Can decline moment so that corresponding peak voltage level is more than this crest voltage and both exist certain distance, now, crest Voltage level need to decline repeatedly continuously, to catch up with the size of crest voltage.In this case, stop at continuous several times power coil The period driven, this peak value does not all arrive corresponding peak voltage level (i.e. comparative result is for without triggering) so that crest electricity Voltage level needs continuous decrease, and cannot obtain correct crest voltage during peak voltage level continuous decrease, can be temporary Time stop perform the above-mentioned step judging metallic foreign body according to attenuation slope.On the other hand, when coil signal is stablized, crest Voltage level can follow the trail of corresponding peak value smoothly, and finely tunes up and down along with the comparative result of comparator module, now, and crest Without situation about triggering when triggering when voltage level there will be, represent coil signal and be in stable state and peak voltage electricity Put down and can represent crest voltage.In this case, the first attenuation slope can be obtained according to peak voltage level and the second decay is oblique Rate, and then perform the above-mentioned step judging metallic foreign body according to attenuation slope.

In one embodiment, multiple steady state parameters can be set, be used for judging whether the coil signal of power coil is located In steady statue, wherein, each steady state parameters may correspond to a peak voltage level, and the biggest instruction of steady state parameters Coil signal is the most stable.Then, processor can be within one period of period, for steady state parameters and corresponding peak voltage electricity thereof Flat and corresponding peak value judges, to judge that peak value arrives a maximum continuous trigger number of times of peak voltage level continuously And peak value does not arrives a maximum non-triggering times continuously of peak voltage level continuously.If touching continuously from the foregoing, maximum Send out number of times or maximum non-triggering times continuously is relatively big, represent peak voltage level and persistently rise or fall, not yet arrive peak electricity Pressure；If maximum continuous trigger number of times and maximum non-triggering times continuously are less, represent peak voltage level attached at corresponding peak value Near and keep track.In the case, processor can be both less than at maximum continuous trigger number of times and maximum non-triggering times continuously During one predetermined value, improve steady state parameters；Or it is more than predetermined at maximum continuous trigger number of times or maximum non-triggering times continuously During value, reduce steady state parameters.If during consequently, it is possible to the plurality of steady state parameters is both greater than a marginal value, represent all Peak voltage level follows the trail of corresponding peak value the most smoothly, and now processor can calculate the first decay of coil signal tiltedly further Rate and the second attenuation slope, and then whether there is metallic foreign body in judging the electric power range of transmission of inductive power-supply supply device.If When in the plurality of steady state parameters, any one is less than marginal value, at least there is a peak voltage level and not yet arrive relatively in representative The peak value answered, now processor can stop performing the determination methods of above-mentioned metallic foreign body.

In addition, follow the trail of the speed of peak value for promoting peak voltage level, can sentence in up-to-date several comparative results Disconnection continues the number of times occurring triggering or the number of times triggered does not occurs continuously.If occur continuous multiple comparative result all for have triggering and When the number of times of continuous trigger is more than a pre-determined number, represents crest voltage and may be much larger than peak voltage level, now can increase The speed of peak voltage level boost, to accelerate to track crest voltage；Similarly, if occurring, continuous multiple comparative result is all When the number of times that nothing triggers and nothing triggers continuously is more than a pre-determined number, represents crest voltage and may be much smaller than peak voltage level, Now can increase the speed that peak voltage level reduces, to accelerate to track crest voltage.

It should be noted that and it will be appreciated by those skilled in the art that four comparator module M1 of above-mentioned employing～M4 and ripple Voltage level V1～V4 respectively tracking coil signal C1 in peak is when power coil 116 stops driving the 7th, the 8th, the 12nd and the 13rd The embodiment of the crest voltage in individual cycle of oscillation is only the one in the middle of the numerous embodiment of the present invention.In other embodiments In, it is possible to take out other peak value and calculate the first attenuation slope and the second attenuation slope.For example, the 4th and the 6th can be used Peak value in cycle of oscillation calculates power coil and stops driving the first attenuation slope of early stage, and uses the 12nd and the 14th to shake Swing the peak value in the cycle and stop driving second attenuation slope in later stage to calculate power coil, to judge the difference of two attenuation slopes Different.In another embodiment, it is possible to only calculate the first attenuation slope and the second attenuation slope by three peak values.

Refer to Fig. 7, Fig. 7 is that another embodiment of the present invention judges coil signal C1 when power coil 116 stops and driving The waveform diagram of attenuation slope.Fig. 7 draws coil signal C1, drives signal D1 and D2 and comparative result CR1～CR3.? This example only includes three comparative result CR1～CR3, therefore has only to three comparator module (such as the comparator module in Fig. 1 M1～M3) can realize.When power coil 116 stops driving, processor 111 can first pass through comparator module M1 to obtain line The double time point rising above reference voltage level V_ref of ring signal C1.Then, comparator module M1～M3 can divide Not Qu Chu coil signal C1 stop driving after peak value in the 5th, the 9th and the 13rd cycle of oscillation, and follow the trail of peak value and produce ripple Peak voltage level V1～V3.Further, processor 111 can calculate the first attenuation slope according to peak voltage level V1～V3 And second attenuation slope.Specifically, processor 111 can be by the difference of peak voltage level V1 and peak voltage level V2 divided by the The distance of 5 crests and the 9th crest 4 of coil signal C1 (i.e. cycle of oscillation length), to calculate the first attenuation slope, And by the difference of peak voltage level V2 and peak voltage level V3 divided by the 9th crest and distance (the i.e. coil of the 13rd crest Signal C1 4 cycle of oscillation length), to calculate the second attenuation slope.In this case, processor 111 is also dependent on phase Same mode, adjusts metallic foreign body according to the difference of the first attenuation slope and the second attenuation slope and judges the numerical value of accumulator, enter And whether there is metallic foreign body in judging the electric power range of transmission of inductive power-supply supply device 100.

It should be noted that Chinese patent application case 201610296710.2 (seeing this case Fig. 1) is by a digital simulation The arrange in pairs or groups comparator of a tension measuring circuit of transducer is to produce reference voltage, and is come according to reference voltage by operational amplifier Amplifying the wave crest portions of coil signal, three comparator module compare for the wave crest portions after amplifying again, to judge to adjust The reception of signal processed.On the other hand, the present invention can be come by multiple comparator module when the drive signal interruption of power coil The crest voltage of tracking coil signal attenuation, and then judge whether metallic foreign body exists according to its decay behavior and (see this Bright Fig. 1).Therefore, Chinese patent application case 201610296710.2 has similar circuit structure to the present invention, can use identical Circuit unit constitute.In this case, the inductive power-supply supply device of the present invention and metallic foreign body determination methods can with in Inductive power-supply supply device and the modulated signal interpretation method thereof of state's patent application case 201610296710.2 are formed integral with one another.In detail For, inductive power-supply supply device, when normal operation, switches to normal operation mode, with by Chinese patent application case Modulated signal interpretation method disclosed in 201610296710.2 and circuit connecting mode perform the judgement of modulated signal.With Time, drive signal that a bit of period can be periodically interrupted, during drive signal interruption, (i.e. power coil stops the driving phase Between) then it being switched to metallic foreign body sense mode, circuit connecting mode (as shown in Figure 1) and metallic foreign body according to the present invention are detectd Survey method performs the judgement of metallic foreign body.In general, processor can control to drive the interruption of signal and connecing of modulated signal It is received under different time and carries out, and the connected mode setting each circuit unit detects mould at normal operation mode and metallic foreign body Switch between formula.

Above-mentioned about inductive power-supply supply device interrupt drive signal and by comparator module to peak voltage level and peak Threshold voltage compares, and makes peak voltage level follow the trail of crest voltage, and judges that the most stable method of crest voltage can be concluded It is that a crest voltage judges flow process 80, as shown in Figure 8.Crest voltage judges that flow process 80 can be used for inductive power-supply supply device 100 Supply module 1, it comprises the following steps:

Step 800: start.

Step 802: when power coil 116 stops driving, processor 111 is by multiple peak voltage level V1～V4 respectively Input corresponding comparator module M1～M4.

Step 804: comparator module M1～M4 judge whether corresponding peak value arrives corresponding peak voltage respectively Level V1～V4 and trigger.The most then perform step 806；If it is not, then perform step 810.

Step 806: promote the numerical value of peak voltage level.

Step 808: continuous multiple comparative result is all the number of times having triggering and continuous trigger predetermined more than one time if occurring During number, increase the speed of peak voltage level boost.

Step 810: reduce the numerical value of peak voltage level.

Step 812: continuous multiple comparative result is all to make a reservation for more than one without the number of times triggered and nothing triggers continuously if occurring During number of times, increase the speed that peak voltage level reduces.

Step 814: in during one a, it is judged that peak value arrives a maximum of corresponding peak voltage level continuously continuously Triggering times and this peak value do not arrive a maximum non-triggering times continuously of this peak voltage level continuously.

Step 816: when maximum continuous trigger number of times and the maximum non-triggering times continuously of this peak value are both less than a predetermined value Time, improve the steady state parameters corresponding to this peak value, maybe continuous the most not when maximum continuous trigger number of times or the maximum of this peak value When triggering times is more than this predetermined value, reduce this steady state parameters.

Step 818: judge whether the steady state parameters corresponding to each peak value is both greater than a marginal value.If so, perform Step 820；If it is not, perform step 824.

Step 820: perform to judge the electricity of inductive power-supply supply device according to the first attenuation slope and the second attenuation slope The step of metallic foreign body whether is there is in power range of transmission.

Step 822: the peak voltage level after storage renewal, uses when stopping driving for power coil 116 next time.

Step 824: terminate.

After obtaining the steady statue of coil signal upward peak and judging that coil signal is stable, processor can take further Obtaining attenuation slope and judge whether metallic foreign body exists, its Detailed Operation mode can be summarized as a metallic foreign body and judge detailed process 90, as shown in Figure 9.Metallic foreign body judges that detailed process 90 can be used for the place in the supply module 1 of inductive power-supply supply device 100 Reason device 111, it comprises the following steps:

Step 900: start.

Step 902: calculate the first attenuation slope, its difference equal to peak voltage level V1 and peak voltage level V2 divided by Corresponding primary peak and the distance of secondary peak.

Step 904: calculate the second attenuation slope, its difference equal to peak voltage level V3 and peak voltage level V4 divided by The 3rd corresponding crest and the distance of the 4th crest.

Step 906: judge that the first attenuation slope deducts numerical value obtained by the second attenuation slope the most critical more than one first Value.The most then perform step 908；If it is not, then perform step 910.

Step 908: improve metallic foreign body and judge the numerical value of accumulator.

Step 910: reduce metallic foreign body and judge the numerical value of accumulator.

Step 912: judge that metallic foreign body judges that whether the numerical value of accumulator is more than one second marginal value.The most then perform Step 914；If it is not, then perform step 916.

Step 914: there is metallic foreign body in judging the electric power range of transmission of inductive power-supply supply device 100.

Step 916: there is not metallic foreign body in judging the electric power range of transmission of inductive power-supply supply device 100.

Step 918: terminate.

It should be noted that metallic foreign body to judge in detailed process 90 to produce the first attenuation slope and the second attenuation slope Mode is only the one in the middle of the numerous embodiment of the present invention.In other embodiments, it is possible to the peak value measuring other crest comes Obtain power coil and stop driving attenuation slope and the attenuation slope in later stage of early stage, to compare whether attenuation slope changes.Or Person, it is possible to according to the method for Fig. 7, realizes the first decay according only to three comparator module and three peak voltage level oblique Rate and the computing of the second attenuation slope.In another embodiment, it is possible to use more comparator module follow the trail of more multi-peak Voltage, to obtain the decay behavior of more detailed coil signal, and then promotes the accuracy that metallic foreign body judges.

In another embodiment, the quantity of comparator module can be reduced further, and shorten what power coil stopping drove Time, to reduce the impact that electric power transmission is caused by drive signal interruption.Additionally, due to the minimizing of comparator module quantity, can Reduce effect of cost.Refer to the signal that Figure 10, Figure 10 are the embodiment of the present invention one inductive power-supply supply device 100 ' Figure.As shown in Figure 10, the circuit structure of inductive power-supply supply device 100 ' similar in appearance to the inductive power-supply supply device 100 of Fig. 1, therefore Signal or the assembly with identical function all represent with same-sign.Inductive power-supply supply device 100 ' and inductive power-supply supply The difference of device 100 is, inductive power-supply supply device 100 ' only includes two comparator module M1 '～M2 ', wherein, comparator Module M1 ' can be used to judge length cycle of oscillation of coil signal C1, comparator module M2 ' can be used to the electricity of each peak value of comparison Press and different peak voltage level.

Specifically, in the inductive power-supply supply device 100 of Fig. 1, comparator module M1～M4 correspond to a peak respectively Value and corresponding peak voltage level thereof, and be used for comparing its corresponding peak value and peak voltage level.In comparison, at Figure 10 Inductive power-supply supply device 100 ' in, comparator module M2 ' can be used to the multiple peak value of comparison and corresponding peak voltage thereof Level.When processor 111 obtains the cycle of oscillation of coil signal C1 after length, and processor 111 i.e. may know that power coil 116 The peak of coil signal C1 resonance when stopping driving.Therefore, when power coil 116 stops driving, processor 111 can be Each peak to be compared exports corresponding peak voltage level respectively to comparator module M2 ', comparator mould The corresponding peak voltage level that each peak value can sequentially be stopped producing when driving by block M2 ' with a front power coil 116 enters Row compares.For example, if being intended to be followed the trail of respectively the voltage of 4 peak values by 4 peak voltage level V1～V4, once supplying Electric coil 116 stops the period driving, and processor 111 can export crest voltage level V1～V4 respectively in the position of 4 crests To comparator module M2 ', comparator module M2 ' can sequentially compare, and return 4 comparative result CR2 to processor 111, whether processor 111 occurs to trigger and the corresponding number adjusting peak voltage level V1～V4 further according to 4 comparative result CR2 Value, and the judgement of metallic foreign body is carried out according to the numerical value of peak voltage level V1～V4.

In addition, in the inductive power-supply supply device 100 ' of Figure 10, comparator module M1 ' then it is used for judging that coil is believed Length cycle of oscillation of number C1.In this instance, comparator module M1 ' obtain the length and comparator cycle of oscillation of coil signal C1 Module M2 ' follow the trail of crest voltage be to carry out in the same time, with shorten power coil 116 stop drive time.As it has been described above, The frequency of oscillation that power coil 116 stops when driving will not change at short notice, and therefore, processor 111 can be by previous Length cycle of oscillation that secondary power coil 116 stops obtaining when driving is used for the judgement (supply lines of coil signal C1 crest location The cycle that circle 116 stopping drives is extremely short).Similarly, processor 111 exportable reference voltage level V_ref is to comparator module M1 ', with according to comparator module M1 ' output result judge coil signal C1 double rise above reference voltage electricity The time point of flat V_ref (i.e. comparator module M1 ' the signal rising edge of comparative result CR1).Or, processor 111 also may be used Measure repeatedly coil signal C1 continuously and rise above the time point of reference voltage level V_ref, to be vibrated by multiple coils The meansigma methods in cycle calculates length cycle of oscillation, and then promotes the accuracy judging length cycle of oscillation.In another embodiment In, it is possible to use the falling edge of signal of comparative result CR1 instead as the basis for estimation of length cycle of oscillation, and be not limited to this.

Refer to Figure 11, Figure 11 is that in inductive power-supply supply device 100 ', power coil 116 stops judging coil when driving The waveform diagram of signal C1 attenuation slope.Figure 11 draw coil signal C1, drive signal D1 and D2 and comparative result CR1 and CR2.Wherein, comparative result CR1 and CR2 is respectively comparator module M1 in Figure 10 ' and the output of M2 '.When power coil 116 stops When only driving, processor 111 exportable reference voltage level V_ref is to comparator module M1 ', with by comparator module M1 ' Obtain length cycle of oscillation of coil signal C1.Processor 111 also can take out line after power coil 116 stops driving Crest voltage in the 2nd of ring signal C1, the 3rd, the 6th and the 7th cycle of oscillation.Specifically, the 2nd, the 3rd, the 6th and the 7th On individual crest location, a front power coil 116 can be stopped peak voltage level V1～V4 updated when driving by processor 111 The time point sequentially occurred at the 2nd, the 3rd, the 6th and the 7th crest of coil signal C1 is input to comparator module M2 ', and from Comparator module M2 ' received in sequence comparative result CR2, and update peak voltage level V1～V4 according to comparative result CR2 correspondence Numerical value, i.e. whether occur triggering to determine corresponding peak voltage level on corresponding position according to comparative result CR2 V1～V4 need to rise or fall.

In this instance, the break period driving signal D1 and D2 is extremely short, is about available for coil signal C1 and vibrated voluntarily for 7 week Phase.Further, owing to processor 111 known coil signal C1 is at the frequency of oscillation stopped when driving and crest location, therefore, The driving frequency driving signal D1 and D2 can be set as the frequency of oscillation being equal to coil signal C1 when stopping driving.Work as confession At the end of electric coil 116 stops during driving, processor 111 directly can start the fortune driving signal D1 and D2 with same frequency Make, and the waveform driving signal D1 and D2 is bonded on the waveform of coil signal C1.Consequently, it is possible to not only coil signal C1 Can recover rapidly driving force, when engaging smoothly, the amplitude of coil signal C1 will not be substantially increased and cause circuit group moment Part burns.

It is noted that in the embodiment in figure 11, drive signal D1 and D2 to stop when driving power coil 116 and all stop At high potential；But in the fig. 4 embodiment, drive signal D1 and D2 to stop when driving power coil 116 and all rest on electronegative potential. During additionally, also can control to drive signal D1 and D2 to stop driving power coil 116, one rests on high potential and another one stops At electronegative potential.The mode that above-mentioned control drives signal D1 and D2 to interrupt not should be the restriction of the present invention.

Further, above-mentioned in the 2nd, the 3rd, the 6th and the 7th cycle of oscillation after tracking coil signal C1 stopping driving Peak voltage level V1～V4 of peak value can be used to calculate first attenuation slope of coil signal C1 and the second attenuation slope, enter And judge whether metallic foreign body exists according to the difference of attenuation slope.Its Detailed Operation mode refers to described above, at this Do not repeat.Additionally, comparator module M2 ' also can be used to follow the trail of the peak value in other cycle of oscillation, or use alternate manner to count Calculate the first attenuation slope and the second attenuation slope, and be not limited to this.

In sum, whether deposit in the invention discloses a kind of electric power range of transmission detecting inductive power-supply supply device Method and inductive power-supply supply device thereof at metallic foreign body.Power coil operate during, can interrupt drive signal with Stop power coil being driven.When power coil stops driving, processor can obtain the signal of power coil and shake The frequency swung, and judge the crest location of coil signal accordingly.Then, processor can be by comparator module and crest electricity Voltage level follows the trail of crest voltage, and then is calculated the attenuation slope of coil signal by multiple peak voltage level.Supplying During electric coil stops driving, if the change of the attenuation slope of coil signal is more than a predetermined value, then can determine whether as metal different Thing exists.Consequently, it is possible to the present invention is by the judgement of the attenuation slope of coil signal, more effective metallic foreign body can be realized and detect Survey, and then promote the protected effect of vicarious power supply unit.

The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for the skill of this area For art personnel, the present invention can have various modifications and variations.All within the spirit and principles in the present invention, that is made any repaiies Change, equivalent, improvement etc., should be included within the scope of the present invention.

Claims

1., for a method for an inductive power-supply supply device, the electric power being used for detecting this inductive power-supply supply device sends In the range of whether there is metallic foreign body, the method includes:

Interrupt at least one driving signal of this inductive power-supply supply device, to stop the power supply to this inductive power-supply supply device Coil is driven；

Within the first period that this power coil stops in driving, obtain one first attenuation slope, and stop at this power coil In the second phase in only driving, obtain one second attenuation slope；And

Judge that according to this first attenuation slope and this second attenuation slope this electric power of this inductive power-supply supply device sends model Whether metallic foreign body is there is in enclosing.

2. the method for claim 1, it is characterised in that after this second phase is positioned at this first period, and according to this Whether the first attenuation slope and this second attenuation slope are deposited in judging this electric power range of transmission of this inductive power-supply supply device Step at metallic foreign body includes:

When numerical value obtained by this first attenuation slope deducts this second attenuation slope is more than first marginal value, improve a metal Foreign body judges the numerical value of accumulator；

When numerical value obtained by this first attenuation slope deducts this second attenuation slope is less than this first marginal value, reduce this metal Foreign body judges the numerical value of accumulator；And

When this metallic foreign body judges the numerical value of accumulator more than second marginal value, it is judged that being somebody's turn to do of this inductive power-supply supply device Metallic foreign body is there is in electric power range of transmission.

3. the method for claim 1, it is characterised in that within this first period that this power coil stops in driving, Obtain this first attenuation slope, and within this second phase that this power coil stops in driving, obtain this second attenuation slope Step include:

When this power coil stops driving, take out multiple peak values of a coil signal vibration of this power coil；And

The plurality of peak value is stopped respectively in the multiple peak voltage level produced during driving relative with front once this power coil The peak voltage level answered compares.

4. method as claimed in claim 3, it is characterised in that the quantity of the plurality of peak voltage level equal to take out this is many The quantity of individual peak value, and the plurality of peak voltage level is respectively intended to follow the trail of the voltage of the plurality of peak value.

5. method as claimed in claim 4, it is characterised in that also include:

When a peak voltage level corresponding during a peak value arrives the plurality of peak voltage level in the plurality of peak value, improve The numerical value of this peak voltage level, when this peak value does not arrives this peak voltage level, reduces the numerical value of this peak voltage level, This peak voltage level is made to follow the trail of the voltage of this peak value.

6. method as claimed in claim 3, it is characterised in that the plurality of peak value include one first peak value, one second peak value, one 3rd peak value and one the 4th peak value, it is respectively this coil signal when this power coil stops driving and carries out the one the of nature vibration One crest, a secondary peak, one the 3rd crest and the numerical value of one the 4th crest, wherein, this first attenuation slope equal to this first The difference of peak voltage level and this secondary peak voltage level is divided by the distance of this primary peak Yu this secondary peak, and this second declines Subtract the slope difference equal to the 3rd peak voltage level and the 4th peak voltage level divided by the 3rd crest and the 4th ripple The distance at peak.

7. method as claimed in claim 3, it is characterised in that the plurality of peak value include one first peak value, one second peak value and One the 3rd peak value, its be respectively this power coil stop drive time this coil signal carry out a primary peak of nature vibration, one Secondary peak and the numerical value of one the 3rd crest, wherein, this first attenuation slope equal to this primary peak voltage level with this second The difference of peak voltage level is divided by the distance of this primary peak Yu this secondary peak, and this second attenuation slope is equal to this secondary peak The difference of voltage level and the 3rd peak voltage level is divided by the distance of this secondary peak Yu the 3rd crest.

8. method as claimed in claim 3, it is characterised in that also include:

By the multiple steady state parameters corresponding to the plurality of peak value, it is judged that whether this coil signal of this power coil is in One steady statue, the plurality of steady state parameters this coil signal of the biggest instruction is the most stable；

Within a third phase, it is judged that corresponding to being somebody's turn to do during in the plurality of peak value, a peak value arrives the plurality of peak voltage level continuously The maximum continuous trigger number of times of the one of one peak voltage level of peak value and this peak value do not arrive this peak voltage level continuously One maximum non-triggering times continuously；And

When non-triggering times is both less than a predetermined value continuously for this maximum continuous trigger number of times and this maximum, improve the plurality of stable Corresponding to a steady state parameters of this peak value in state parameter, maybe do not touch continuously when this maximum continuous trigger number of times or this maximum When sending out number of times more than this predetermined value, reduce this steady state parameters.

9. method as claimed in claim 8, it is characterised in that also include:

When the plurality of steady state parameters is both greater than a marginal value, perform according to this first attenuation slope and this second decay oblique Whether rate exists the step of metallic foreign body in judging this electric power range of transmission of this inductive power-supply supply device；And

When steady state parameters arbitrary in the plurality of steady state parameters is less than this marginal value, stop performing first to decline according to this Subtract slope and whether this second attenuation slope exists metal in this electric power range of transmission judge this inductive power-supply supply device The step of foreign body.

10. an inductive power-supply supply device, including a supply module, this supply module includes:

One power coil；

One resonant capacitance, is coupled to this power coil, and for arranging in pairs or groups, this power coil carries out resonance；

At least one for electric drive unit, is coupled to this power coil and this resonant capacitance, be used for sending at least one driving signal to This power coil, to drive this power coil to produce energy, and interrupts this at least one driving signal to stop this power coil It is driven；And

One processor, is used for receiving the coil signal on this power coil, and performs following steps:

11. inductive power-supply supply devices as claimed in claim 10, it is characterised in that this second phase is positioned at this first period After, and this processor also performs following steps, to judge this sense according to this first attenuation slope and this second attenuation slope Metallic foreign body whether is there is in answering this electric power range of transmission of formula power supply unit:

12. inductive power-supply supply devices as claimed in claim 10, it is characterised in that also include:

Multiple comparator module, are coupled to this processor, and each of which comparator module is used for taking out this power coil and stops driving A peak value corresponding in multiple peak values of this coil signal vibration time dynamic, and this peak value is stopped with front once this power coil In the multiple peak voltage level produced during driving, the peak voltage level corresponding to this peak value compares.

13. inductive power-supply supply devices as claimed in claim 10, it is characterised in that also include:

One comparator module, is coupled to this processor, is used for taking out respectively this coil signal when this power coil stops driving and shakes The multiple peak values swung, and produce many when sequentially stopping driving by the peak value in the plurality of peak value and front once this power coil In individual peak voltage level, the peak voltage level corresponding to this peak value compares.

14. inductive power-supply supply devices as claimed in claim 12, it is characterised in that the quantity of the plurality of peak voltage level Equal to the quantity of the plurality of peak value taken out, and the plurality of peak voltage level is respectively intended to follow the trail of the voltage of the plurality of peak value.

15. inductive power-supply supply devices as claimed in claim 14, it is characterised in that this processor also performs following steps:

16. inductive power-supply supply devices as claimed in claim 12, it is characterised in that the plurality of peak value includes a first peak Value, one second peak value, one the 3rd peak value and one the 4th peak value, it is respectively this coil signal when this power coil stops driving and enters A primary peak, a secondary peak, one the 3rd crest and the numerical value of one the 4th crest that row vibrates naturally, wherein, this first declines Subtract the slope difference equal to this primary peak voltage level and this secondary peak voltage level divided by this primary peak and this second ripple The distance at peak, this second attenuation slope equal to the 3rd peak voltage level and the 4th peak voltage level difference divided by this Three crests and the distance of the 4th crest.

17. inductive power-supply supply devices as claimed in claim 12, it is characterised in that the plurality of peak value includes a first peak Value, one second peak value and one the 3rd peak value, it is respectively this coil signal when this power coil stops driving and carries out nature vibration A primary peak, a secondary peak and the numerical value of one the 3rd crest, wherein, this first attenuation slope is equal to this primary peak electricity The difference of voltage level and this secondary peak voltage level is divided by the distance of this primary peak Yu this secondary peak, this second attenuation slope Equal to this secondary peak voltage level and the 3rd peak voltage level difference divided by this secondary peak and the 3rd crest away from From.

18. inductive power-supply supply devices as claimed in claim 12, it is characterised in that this processor also performs following steps:

19. inductive power-supply supply devices as claimed in claim 18, it is characterised in that this processor also performs following steps:

20. 1 kinds of methods for an inductive power-supply supply device, the electric power being used for detecting this inductive power-supply supply device is sent out Whether there is metallic foreign body in the range of sending, the method includes:

Set a reference voltage level；

When this power coil stops driving, detect a coil signal of this power coil, to obtain this coil signal continuous two The secondary time point rising above this reference voltage level；

According to the double time point rising above this reference voltage level of this coil signal, obtain this coil signal at this Power coil stop drive time one cycle of oscillation length；And

According to this of length, obtain one attenuation slope of this coil signal when this power coil stops driving cycle of oscillation.

21. methods as claimed in claim 20, it is characterised in that rise above this ginseng according to this coil signal is double Examine the time point of voltage level, obtain this coil signal this power coil stop when driving this cycle of oscillation length step Including:

In one first harmonic period that this power coil stops when driving, rise above this reference voltage at this coil signal An initial intervalometer in one first time point of level；

Adjacent in one second harmonic period of this first harmonic period, rise above this reference voltage at this coil signal This intervalometer is stopped on one second time point of level；And

During obtaining a timing of this intervalometer, and this of length will be set as during this timing cycle of oscillation.

22. methods as claimed in claim 20, it is characterised in that this reference voltage level is set equal to or close to zero electricity Position.