CN103887895A - Power supply module for induction type power supply and current signal detection method - Google Patents
Power supply module for induction type power supply and current signal detection method Download PDFInfo
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Abstract
The invention discloses a power supply module for an induction type power supply and a current signal detection method, wherein the current signal detection method is used for the power supply module of the induction type power supply, the power supply module comprises a power supply coil and a resonance capacitor, and the current signal detection method comprises the steps of connecting a current detection component in series between the power supply coil and the resonance capacitor so as to obtain a current signal corresponding to the current of the power supply coil; and analyzing the current signal to extract data of a power receiving module of the induction type power supply and judge the load state of the power supply coil driving to the power receiving coil. The signal detection of the present invention can obtain the data of the load end more easily.
Description
Technical field
The present invention relates to a kind of current signal detection method of the supply module for inductive power-supply supply device and be correlated be subject to electric module, relate in particular to a kind of can be by the detecting of current signal in the supply module of inductive power-supply supply device, adopt electric current and drive poor interpretation loading level and the metallic foreign body existence of carrying out of signal time, and regulate trigger bit standard and the triggering of current signal to take out data modulated signal by automatic, and the difference of parsing half period current signal is subject to electric module to take out the method for data modulated signal and to be correlated with.
Background technology
In inductive power-supply supply device, for safe operation, need to confirm that on its power supply coil, induction region is correct current-collecting device at feed end, and under the situation that can receive electric power, just carry out electric power transmission, in order whether being correct current-collecting device in feeder ear identification, need to send and identify by numeric data code.The transmission of numeric data code is to drive power supply coil to produce resonance by feeder ear, send electromagnetic energy and be sent to receiving end, to carry out electric power transmission, and in the time that receiving end receives electric power, can change the impedance state on receiving coil by signal modulation technique, then the resonance carrier signal of powering on coil by feedback influence changes.In the prior art, the voltage that on coil, resonance carrier wave occurs and curent change need to take out by voltage and current detection circuit, and take out after change in voltage resonance carrier wave need to be taken out to direct current differential wave by high frequency ac signal by low pass filter, electric current also must first convert voltage to and just can process, its variable quantity is very little, therefore needs to be processed and just can be taken out modulation signal by amplification.In Chinese invention patent application 201310228302.X, the low pass filtered of will carrying out signal resolution main circuit involves the accurate coupling in direct current position and waits running, and in conjunction with circuit such as comparators, its small modulation signal variable quantity is changed into digital signal, then understand these modulation signals to carry out decoding by the software in microprocessor.
But, the prior art part that still has some deficits: the first, the variable quantity of voltage and electric current is clear and definite not also stable not, while entering the signal resolution circuit of rear end, if cannot resolve small-signal when amplification ratio is not enough, and the excessive noise of easily sneaking into of amplification ratio, so the more difficult design of circuit and unreliable; Second, voltage can change because coil configuration and power transmit the different factors such as size from current change quantity, especially after power strengthens, its modulation ratio (ratio of main resonance carrier wave and the modulation signal degree of depth) can diminish, correct decoding can become difficulty, and therefore approaching cannot modulation signal after fully loaded; The 3rd, because signal needs to resolve after filtering later again, modulation signal on main resonance carrier wave changes and is changed and need to be passed through several cycles by filter, and the cycle that modulation signal changes must be greater than signal and reach the stable time through filter later, can be limited so transmit the speed of data; Whether the 4th, prior art can only be used for input, cannot learn the load state on coil, as fully loaded or noly have a metallic foreign body etc. in coil; The 5th, signal resolution circuit need use a large amount of electronic building bricks, and its cost is higher, and in addition, the more reliabilitys that can cause of part decline, as long as one of them part goes wrong and will make circuit malfunction.In view of this, prior art has improved necessity in fact.
Summary of the invention
Therefore, main purpose of the present invention is to provide a kind of current signal detection method of the supply module for inductive power-supply supply device and correspondence to be subject to electric module, it can be by the detecting of current signal in inductive power-supply supply device, adopt electric current and drive poor interpretation loading level and the metallic foreign body of carrying out of signal time, and obtain modulation signal by automatic adjusting trigger bit is accurate with the triggering of current signal, or difference by resolving half period current signal is to obtain modulation signal.
The present invention discloses a kind of current signal detection method, for a supply module of an inductive power-supply supply device, described supply module comprises a power supply coil and a resonant capacitance, described method is included between described power supply coil and described resonant capacitance and is connected in series a current detection component, to obtain the current signal corresponding to described power supply coil; And resolve described current signal, be subject to data of electric module to take out one of described inductive power-supply supply device.
The present invention also discloses a kind of supply module for an inductive power-supply supply device, comprises a power supply coil; One resonant capacitance; One current detection component, is serially connected between described power supply coil and described resonant capacitance, is used for obtaining the current signal corresponding to the electric current of described power supply coil; And a control unit, be coupled to described current detection component, be used for resolving described current signal, be subject to data of electric module to take out one of described inductive power-supply supply device.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the embodiment of the present invention one supply module.
Fig. 2 is the schematic diagram of an execution mode of the supply module of Fig. 1.
Fig. 3 is the waveform schematic diagram that drives signal and coil signal under the zero load of embodiment of the present invention inductive power-supply supply device.
Fig. 4 is that embodiment of the present invention inductive power-supply supply utensil has the waveform schematic diagram that drives signal and coil signal under load.
Fig. 5 is the fully loaded lower waveform schematic diagram that drives signal and coil signal of embodiment of the present invention inductive power-supply supply device.
Fig. 6 drives the schematic diagram of signal and coil signal while being embodiment of the present invention inductive power-supply supply device receiving end placement metallic foreign body.
Fig. 7 is the schematic diagram of another execution mode of supply module.
Fig. 8 be embodiment of the present invention signal unmodulated during and the waveform schematic diagram of current signal and positive half cycle comparator Output rusults between modulation period.
Fig. 9 is the waveform schematic diagram of current signal and positive half cycle comparator Output rusults between embodiment of the present invention signal modulation period.
Figure 10 is the waveform schematic diagram of current signal while being subject to noise jamming between embodiment of the present invention signal modulation period.
Figure 11 is the schematic diagram that has one of half-wave voltage signal modulation function and be subject to electric module.
Figure 12 is the schematic diagram that the embodiment of the present invention is carried out half-wave voltage signal when modulation current signal.
Wherein, description of reference numerals is as follows:
10 supply modules
102 power supply coils
104 resonant capacitances
106 current detection components
108 control units
110,110A, 110B are for electric drive unit
S1 current signal
121A, 121B drive unit
The upper bridge switch assembly of 123A, 123B
Bridge switch assembly under 124A, 124B
210 power supply units
220 display units
230 current zero comparators
T switching cycle
702 signal interpretation circuit
A1, A2 amplifier
712,714 accurate generators
722 positive half cycle comparators
724 negative half period comparators
The positive phase voltage signal of VP
VN reverse voltage signal
VR1, VR2 reference voltage
R1, R2 Output rusults
1100 are subject to electric module
SP1 positive half cycle current signal
SN1 negative half-cycle current signal
Embodiment
Please refer to Fig. 1, Fig. 1 is the schematic diagram of the embodiment of the present invention one supply module 10.As shown in Figure 1, supply module 10 is for an inductive power-supply supply device, and it comprises that a power supply coil 102, a resonant capacitance 104, a current detection component 106, a control unit 108 and are for electric drive unit 110.Power supply coil 102 can send energy to receiving end, and receives the feedback signal from receiving end.104 of resonant capacitances are used for collocation power supply coil 102 and carry out resonance, to produce alternating electromagnetic energy.Current detection component 106 is serially connected between power supply coil 102 and resonant capacitance 104, can be used to obtain the current signal S1 corresponding to power supply coil 102 electric currents.In general, current detection component 106 can be the current detector of a current sense resistor, a Hall current sensor (Hall Effect Current Sensor) or other type.Control unit 108 is coupled to current detection component 106, can be used to resolve current signal S1, and then takes out one of inductive power-supply supply device and be subject to the data of electric module.Be used for driving power supply coil 102 to send energy for 110 of electric drive units.
Before resolving, must first carry out low-pass filtering compared to voltage signal in prior art or current signal, supply module 10 does not need can directly be resolved current signal S1 and be obtained modulation signal by filtering, that is control unit 108 can directly be resolved the ac signal that coil produces.But in ac signal, the method for taking out precision current value is very difficult, especially, in wireless charging system, the frequency of alternating current composition is higher and electric current is larger, thereby is not easy to process.In the case, can change by taking out and comparing size of current generation triggering signal whether mode and obtain modulation signal, can carry out load condition interpretation by current direction detection in addition.
In one embodiment, supply module 10 can be obtained a load information by the change of the sense of current, to indicate the load condition of inductive power-supply supply device, judges whether the load end of inductive power-supply supply device has metallic foreign body simultaneously.Please refer to Fig. 2, the schematic diagram of an execution mode of the supply module 10 that Fig. 2 is Fig. 1.In this example, can carry out full-bridge driving to power supply coil 102 for electric drive unit 110, therefore comprise for electric drive unit 110A and 110B two parts for electric drive unit 110, wherein comprise on a drive unit 121A, bridge switch assembly 123A and bridge switch assembly 124A once for electric drive unit 110A, and comprise on a drive unit 121B, bridge switch assembly 123B and bridge switch assembly 124B once for electric drive unit 110B.On the other hand, supply module 10 also comprises a power supply unit 210 and a display unit 220.The function mode of power supply unit 210 and display unit 220 has been disclosed in front case Chinese invention patent application 201310228302.X, is not repeated herein.
Want to obtain the load information of inductive power-supply supply device, the time point that the time point that can switch with reference to the driving signal at power supply coil 102 two ends and coil current make zero.Please refer to Fig. 3, Fig. 3 is the waveform schematic diagram that drives signal A, B and coil signal under the zero load of embodiment of the present invention inductive power-supply supply device.Drive signal A and B to be respectively the switching signal of controlling for electric drive unit 110A and 110B, it can drive power supply coil 102 and resonant capacitance 104 to produce resonance by the intraware for electric drive unit 110A and 110B.Fig. 3 is take full-bridge driving as example, drives signal A and B reverse switching signal each other.As shown in Figure 3, drive signal A and B to carry out electric current on power supply coil 102 and pull, under unloaded situation, do not meet obstructions through the electric current of coil, can present the waveform of triangular wave, and electric current can flow between power supply coil 102 and resonant capacitance 104 in two way alternate.In the time of electric current two way alternate, having a time point is currentless state, the time point that electric current makes zero.In each drive cycle T, electric current all can make zero twice.With regard to driving signal A, in the time driving signal A at high potential, represent the strength that electric current up pushes away, when driving signal A to be down to after electronegative potential, electric current also starts conversion direction.In the time of zero load, drive signal A switching electric potential to the time that electric current makes zero to be approximately 1/4th of switching cycle T.
Please refer to Fig. 4, Fig. 4 is that embodiment of the present invention inductive power-supply supply utensil has the waveform schematic diagram that drives signal A, B and coil signal under load.As shown in Figure 4, add after load, because power supply coil 102 and resonant capacitance 104 produce resonance interaction with coil and the electric capacity of receiving end, so electric current starts to change.In the time that load increases the weight of, the time point that electric current makes zero can be gradually near driving signal A to switch to the time point of electronegative potential.
Please refer to Fig. 5, Fig. 5 is the fully loaded lower waveform schematic diagram that drives signal A, B and coil signal of embodiment of the present invention inductive power-supply supply device.When inductive power-supply supply device full load, supply module 10 has maximum thrust (being maximum energy transfer) to receiving end, and after exceeding this maximum, power and charge efficiency all can decline.As shown in Figure 5, fully loaded in the situation that, drive the time point of signal A switching electric potential can be substantially equal to the time point that electric current makes zero.In addition,, in the time that inductive power-supply supply device transships, drive the time point of signal A switching electric potential to lag behind the time point that electric current makes zero.
Thus, control unit 108 can, according to driving signal A to be switched to the time difference of time point and the time point that electric current makes zero of electronegative potential by high potential, judge the load condition of inductive power-supply supply device, and then obtain load information.The time difference of the time point making zero when the time point that drives signal A switching electric potential and electric current is roughly and drives that four of signal A switching cycle T/for the moment, control unit 108 judges that the load condition of inductive power-supply supply device is zero load; Be less than that four of driving signal A switching cycle T/for the moment, control unit 108 judges that inductive power-supply supply utensil has load the time difference of the time point making zero when the time point that drives signal A switching electric potential and electric current; And when driving the time point of signal A switching electric potential and the time difference of the time point that electric current makes zero to level off to zero time, 108 of control units judge that inductive power-supply supply device approaches full load condition.On the other hand, owing to driving signal B and driving signal A anti-phase voltage signal each other, therefore also can judge with the time point that electric current makes zero according to the time point that drives signal B switching electric potential, its judgment mode is identical with the judgment mode of aforementioned employing driving signal A, is not repeated herein.
In this example, 106 of current detection components are obtained the time point that electric current makes zero in the time of current transformation direction.In other words, current detection component 106 takes out sense of current to carry out signal interpretation, can not consider size of current.Therefore, at the output of current detection component 106, a current zero comparator 230 can be set, to produce a corresponding output valve according to sense of current.For instance, in the time that electric current is forward, the exportable 1(high potential of current zero comparator 230); When electric current is while being reverse, 230 output 0(electronegative potentials of current zero comparator), because the required information of control unit 108 is the time point that electric current makes zero, therefore not needing to limit which direction is forward.Thus, current zero comparator 230 can be sent to sense of current information control unit 108, and gets rid of size of current.And the signal that control unit 108 can be exported according to current zero comparator 230 calculates the time point that electric current makes zero.
It should be noted that current signal S1 is not necessarily sent to comparator or the control unit of rear end with current forms, it also may be with voltage form, digital form or other form transmission.For instance, in the above-described embodiments, current detection component 106 can comprise that a resistance is serially connected between power supply coil 102 and resonant capacitance 104, the voltage that current signal S1 can be resistance two ends subtract each other and result, current detection component 106 is sent to current zero comparator 230 by current signal S1 again, to compare with zero potential.In the case, current signal S1 is a voltage form signal that corresponds to coil current, and by with the direction of relatively judging coil current of zero potential.
In one embodiment, control unit 108 comprises a timer, is used for calculating time point that electric current makes zero and the time difference of time point that drives signal A and B switching electric potential.In the time driving signal A and B switching electric potential, control unit 108 starts timer and starts timing.When current signal S1 switches to 0 or while switching to 1 by 0 (time point that electric current makes zero), control unit 108 stops timing by 1.Then, the time span that control unit 108 can be obtained according to timer and drive the switching cycle T of signal A and B, judges the load condition of inductive power-supply supply device.
No matter be under zero load, heavy duty or full load condition, the size of current on power supply coil 102 is all difficult for precisely differentiating, but certainly exists the crosspoint of making zero, and this return-to-zero can be used to interpretation signal.In the case, because signal does not need device processing after filtering, also do not need time of waiting for that filter is processed signal before analytic signal, conversion speed can thereby promote.In addition, must be limited to the amplifier of simulation or electric current is carried out in the design of filter circuit and voltage analysis could calculate compared to load state on magnetic test coil in prior art, and the present invention can analyze load state by timer, the part using is less, therefore has the advantage such as low cost and high-reliability.According to current signal processing technology, the speed of processor and timing ability, far above analog-converted treatment circuit, therefore, by the processing of control unit 108, can significantly promote signal handling capacity.In addition, time difference interpretation mode of the present invention also can be used to judge whether load end exists metallic foreign body.
Please refer to Fig. 6, Fig. 6 is the schematic diagram that embodiment of the present invention inductive power-supply supply device receiving end drives signal A, B and coil signal while there is metallic foreign body.As shown in Figure 6, in the time there is metallic foreign body in receiving end, power supply coil 102 can produce great electric current and change in voltage, but, because metallic foreign body cannot produce resonance interaction with power supply coil 102, therefore the phase place of electric current is still identical with Light Condition, that is the time point that electric current makes zero still falls behind the time of 1/4th the switching cycle T of time point that drive signal A switching electric potential.Thus, the time point that control unit 108 can make zero by size of current and electric current judges with respect to the time point that drives signal A switching electric potential whether receiving end exists metallic foreign body.
It should be noted that the curent change that the present invention can power on coil by detecting, do not obtain the data of receiving end via filtering, in the above-described embodiments, the data that obtain can be load information or load end and whether exist the relevant information of metallic foreign body.But in wireless charging technology, the object that obtains data is the interpretation by modulating data, judge whether receiving end is correct current-collecting device.Therefore,, in following examples, by by the obtained current signal S1 of current detection component 106, carry out interpretation for the modulation signal that produced by electric module, and then obtain modulating data.
Please refer to Fig. 7, Fig. 7 is the schematic diagram of another execution mode of supply module 10.In Fig. 7, the framework of supply module 10 and the supply module of Fig. 2 10 are similar, and assembly and the signal therefore with identical function all represent with same-sign.The Main Differences of the supply module 10 of Fig. 7 and Fig. 2 is, the supply module 10 of Fig. 7 also comprises a signal interpretation circuit 702, and 702, signal interpretation circuit comprises amplifier A1 and A2, position accurate generator 712 and 714, positive half cycle comparator 722 and a negative half period comparator 724.Amplifier A1 and A2 can received current signal S1, and will in current signal S1, amplify respectively corresponding to the part of forward current and the part of reverse current, be converted to respectively a more positive phase voltage signal VP and a reverse voltage signal VN, wherein, amplifier A1 directly amplifies the part corresponding to forward current in current signal S1 and is converted to positive phase voltage signal VP, and amplifier A2 carries out anti-phase amplification again to the part corresponding to reverse current in current signal S1 later, to produce reverse voltage signal VN.In general, the current signal S1 obtaining due to current detection component 106 is less, after conventionally needing to amplify, could process.And inversion signal can first transfer positive phase signals to, so that back-end processor carries out signal processing.The accurate generator 712 and 714 in position is used for respectively producing reference voltage VR1 and VR2.Positive half cycle comparator 722 comparable calibration phase voltage signal VP and reference voltage VR1, and in the time that positive phase voltage signal VP is greater than reference voltage VR1, trigger the positive half period part of modulation signal.Negative half period comparator 724 can compare reverse voltage signal VN and reference voltage VR2, and in the time that reverse voltage signal VN is greater than reference voltage VR2, triggers the negative half-cycle part of modulation signal.
Each while driving for electric drive unit 110, between power supply coil 102 and resonant capacitance 104, can pull mutually and resonance occurs, and produce alternating current.The electric current of alternating current can change from the different of the situation of driving according to induction situation, its variation meeting is converted to current signal S1 by current detection component 106, and because coil current and current signal S1 are without crossing low-pass filtering, therefore the signal that current signal S1 is high frequency, being difficult for being directly converted to digital signal by analog-digital converter (Analog-to-Digital Converter, ADC) processes.In the case, can first preset one and differentiate the accurate conduct in position with reference to voltage VR1 or VR2, and in a given period that is subject to electric module unmodulated signal, be greater than according to positive phase voltage signal VP the ratio that the ratio of reference voltage VR1 or reverse voltage signal VN are greater than reference voltage VR2, reference voltage VR1 or VR2 are adjusted.
Take the signal resolution of positive half period as example, please refer to Fig. 8, Fig. 8 be embodiment of the present invention signal unmodulated during and the waveform schematic diagram of current signal S1 and positive half cycle comparator 722 Output rusults R1 between modulation period.As shown in Figure 8, in during being subject to electric module unmodulated signal, can the fluctuation up and down along with noise or coil coupling situation corresponding to the current signal S1 of coil current, in the time that current signal S1 is greater than reference voltage VR1, the positive exportable R1=1 of half cycle comparator 722, and in the time that current signal S1 is less than reference voltage VR1, the positive exportable R1=0 of half cycle comparator 722.In this example, control unit 108 can be in the time being subject to electric module unmodulated signal, check whether each current signal S1 is greater than reference voltage VR1 and triggers positive half cycle comparator 722 and produce output result R1=1 in the given period, calculate the ratio of internal trigger between this given period produce output result R1=1 simultaneously.The ratio triggering as current signal S1 is when higher, and the position standard that control unit 108 can improve reference voltage VR1 makes the minimizing of triggering amount; The ratio triggering as current signal S1 is time on the low side, and the position standard that control unit 108 can reduce reference voltage VR1 makes the increase of triggering amount; And under the moderate situation of the ratio of current signal S1 triggering, it is accurate that 108 of control units maintain the position of reference voltage VR1.For instance, the ratio that control unit 108 controllable current signal S1 triggered and exported R1=1 drops between 70%～80%, if when the ratio that in judgement length, current signal S1 triggers is greater than 80%, it is accurate that control unit 108 can improve the position of reference voltage VR1, to reduce the triggering amount of subsequent current signal S1; If when the ratio that in judgement length, current signal S1 triggers is less than 70%, it is accurate that control unit can reduce the position of reference voltage VR1, to improve the triggering amount of subsequent current signal S1.Thus, when system noise is compared with large and while causing triggering amount to increase, the position standard that control unit 108 can improve reference voltage VR1 makes the minimizing of triggering amount, and then avoids noise to cause the erroneous judgement of modulation signal.
Please refer to Fig. 9, Fig. 9 is the waveform schematic diagram of current signal S1 and positive half cycle comparator 722 Output rusults R1 between embodiment of the present invention signal modulation period.Fig. 9 is by the waveform unfolds between signal modulation period in Fig. 8, to facilitate explanation.As mentioned above, after reference voltage VR1 has set, if when receiving end unmodulated signal, the ratio that within a period of time, current signal S1 triggered and exported R1=1 arbitrarily should drop on 70%～80%.If occur, longer a period of time triggers (being that Output rusults R1 is continuously 0) or the few situation of triggering amount, represents that receiving end has started modulation signal, as shown in Figure 9.Between signal modulation period, there will be and have larger triggering amount (as 70%～80%) in a period of time, and triggering amount minimum (as being less than 20%) in a period of time.In the case, control unit 108 can be obtained modulation signal according to the triggering amount size in every length.In addition,, between signal modulation period, during the accurate big or small still sustainable basis in the position of reference voltage VR1 has larger triggering amount, interior triggering ratio is adjusted, to get rid of noise jamming in the time that system environments appearance changes.
Please refer to Figure 10, Figure 10 is the waveform schematic diagram of current signal S1 while being subject to noise jamming between embodiment of the present invention signal modulation period.As shown in figure 10, inductive power-supply supply device, can be because default or environmental factor become in a jumble signal, in the prior art in the time of running, signal all needs to carry out demodulation by filter, and the signal jitter that noise causes may make demodulation result indefinite.In comparison, pass through embodiments of the invention, each drive cycle can be obtained independently current signal S1, and each current signal S1 can produce and triggers or there is no the definite result triggering, and control unit 108 can judge the situation that signal is modulated according to the Output rusults R1 of comparator or R2.In addition, need use more passive component (as resistance, electric capacity or inductance) and easily produce error compared to the low pass filter of prior art, the assembly that circuit of the present invention uses is less, and is mainly the integrated circuit that can highly integrate, therefore has higher stability.
It should be noted that the present invention can, in the situation that signal not being carried out to filtering, directly obtain modulation signal according to the variation of coil current.In one embodiment, control unit 108 can be distinguished the curent change of interpretation positive half period and negative half-cycle, by after separating corresponding to the part of forward current and the part of reverse current in current signal S1 and producing corresponding positive half cycle current signal and negative half-cycle current signal, then according to both difference interpretation modulation signals.In Chinese invention patent application numbers 201210169832.7 and Chinese invention patent application 201310228302.X, being subject to electric module is mainly to carry out modulating data in the mode of all-wave signal modulation.The present invention uses half-wave voltage signal modulator approach instead, makes to produce notable difference between positive half cycle current signal and negative half-cycle current signal.For instance, please refer to Figure 11, Figure 11 is the schematic diagram that has one of half-wave voltage signal modulation function and be subject to electric module 1100.As shown in figure 11, the framework that is subject to electric module 1100 is similar in appearance to the electric module that is subject in Fig. 2 of front case Chinese invention patent application 201310228302.X, and assembly and signal that therefore function is identical all represent with same-sign.Be by electric module 1100 and the Main Differences that is subject to electric module of Chinese invention patent application 201310228302.X, be subject to the signal feedback circuit 23 of electric module 1100 not comprise signal modulated resistance B3, control diode B4, Zener diode B5 and switch module B6.Therefore, be subject to 1100 of electric modules to carry out half-wave voltage signal modulation by signal modulated resistance A3.All be disclosed in Chinese invention patent application 201310228302.X by other module and assembly in electric module 1100, be not repeated herein.
Please refer to Figure 12, Figure 12 is the schematic diagram that the embodiment of the present invention is carried out half-wave voltage signal when modulation current signal S1.As shown in figure 12, current signal S1 can disassemble as forward and reverse part according to the sense of current, to produce positive half cycle current signal SP1 and negative half-cycle current signal SN1.During unmodulated signal, positive half cycle current signal SP1 and negative half-cycle current signal SN1 continue to produce variable quantity to a certain degree, and this variable quantity may be caused by load or noise, and are similar to all-wave signal and modulate the curent change causing.After receiving end starts to carry out half-wave voltage signal modulation, the variable quantity of negative half-cycle current signal SN1 obviously dwindles, and difference slightly only appears in positive half cycle current signal SP1.In the case, control unit 108 can carry out signal resolution according to the signal difference of positive half cycle current signal SP1 and negative half-cycle current signal SN1.For instance, control unit 108 can, in the time that the difference of the change amount signal of positive half cycle current signal SP1 and negative half-cycle current signal SN1 exceedes a critical value, judge that receiving end is just at modulation signal, and start to read modulation signal.It should be noted that, do not limit the phase place of semi-wave modulated at the signal feedback circuit of receiving end, therefore the current signal S1 variable quantity feeding back on power supply coil 102 may appear at positive half cycle current signal SP1 or negative half-cycle current signal SN1, and 108 need of control unit are found out difference between the two.
In sum, supply module of the present invention can provide a kind of data receive method.The method can be detected the curent change of power supply on coil, does not obtain the data of receiving end by filtering, and these data can comprise whether load information, the receiving end of inductive power-supply supply device have the information of metallic foreign body or be subject to modulation signal that electric module produces etc.The present invention directly processes each current signal by processor, and the resolution of signal can significantly promote, and therefore processing speed also increases.Meanwhile, in the situation that not using filter, the circuit unit of supply module inside is less, therefore has the advantage such as low cost and high-reliability.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (29)
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| TW103100707A TWI481144B (en) | 2014-01-08 | 2014-01-08 | Method of sensing current signal for supplying-end module of induction type power supply system |
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| CN103887895B (en) | 2017-01-18 |
| TW201417445A (en) | 2014-05-01 |
| TWI481144B (en) | 2015-04-11 |
| CN105958663B (en) | 2018-07-13 |
| CN105958663A (en) | 2016-09-21 |
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