CN105958663B - 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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- CN105958663B CN105958663B CN201610332966.4A CN201610332966A CN105958663B CN 105958663 B CN105958663 B CN 105958663B CN 201610332966 A CN201610332966 A CN 201610332966A CN 105958663 B CN105958663 B CN 105958663B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/70—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes
- H04B5/72—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes for local intradevice communication
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/20—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by the transmission technique; characterised by the transmission medium
- H04B5/24—Inductive coupling
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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
The applying date of original application case is on 2 12nd, 2014, and the application number of original application case is 201410049320.6, and former
The denomination of invention of application case is " power supply module and current signal detection method that are used for inductive power-supply supply device ".
Technical field
The present invention relates to the current signal detection methods and phase in a kind of power supply module for inductive power-supply supply device
It closes by electric module more particularly to a kind of can be adopted in the power supply module of inductive power-supply supply device by the detecting of current signal
Interpretation loading level and metallic foreign body existence are carried out with electric current and drive signal time difference, and by automatically adjusting trigger bit
The accurate triggering with current signal takes out data modulated signal, and the difference of parsing half period current signal to take out data modulation
The method and correlation of signal are by electric module.
Background technology
In inductive power-supply supply device, for safe operation, need to confirm induction region on its power supply coil in feed end
For correct power receiving device, just and electric power transmission is carried out under the situation that can receive electric power, in order to be recognized whether in feeder ear
For correct power receiving device, need to be identified by numeric data code transmission.The transmission of numeric data code is to drive to supply by feeder ear
Electric coil generates resonance, sends electromagnetic energy and is transmitted to receiving end, to carry out power transmission, and when receiving end receives electric power,
The impedance state on receiving coil can be changed by signal modulation technique, then pass through the resonance carrier wave on feedback influence power supply coil
Signal intensity.In the prior art, the voltage that resonance carrier wave occurs on coil needs to examine by voltage and electric current with curent change
Slowdown monitoring circuit takes out, and the voltage change after taking out needs by high frequency ac signal to take out resonance carrier wave directly by low-pass filter
Differential wave is flowed, electric current must also be first converted into voltage and could be handled, and variable quantity is very small, it is therefore desirable to pass through amplification
Processing just can be taken off modulated signal.In Chinese invention patent application number 201310228302.X, signal resolution circuit is mainly held
Row low pass filtered involves the runnings such as direct current level coupling, and the circuits such as comparator is combined to turn its small modulated signal variable quantity
These modulated signals are understood with into row decoding at digital signal, then by the software in microprocessor.
The place however, prior art still has some deficits：First, the variable quantity of voltage and electric current is not clear enough to be also not sufficiently stable,
Into rear end signal resolution circuit when, if can not parse small signal when amplification ratio deficiency, and amplification ratio is excessive is easy to be mixed into
Noise, thus circuit it is more difficult design and it is unreliable；Second, voltage can be because coil configuration and power transmission be big with current change quantity
The different factors such as small and change, especially after power increase, the modulation ratio (ratio of main resonance carrier wave and modulated signal depth
Example) it can become smaller, correct decoding can become difficult, therefore can not modulated signal close to after being fully loaded with；Third, since signal need to be through filtering
Wave is parsed again later, and the modulated signal variation on main resonance carrier wave generates variation by filter and needs by several weeks again
Phase, and period for changing of modulated signal have to be larger than signal and reach the stable time after the filter, so transmission data
Rate can be limited；4th, the prior art is only used in signal detection, can not learn the load state on coil, such as coil
Whether be fully loaded with or whether have metallic foreign body etc.；5th, signal resolution circuit need to use a large amount of electronic building brick, and cost is higher,
Reliability can be caused to decline in addition, part is more, as long as one of part, which goes wrong, will make circuit malfunction.In view of this,
There is a need for improvement for the prior art.
Invention content
Therefore, the main purpose of the present invention is to provide the electricity in a kind of power supply module for inductive power-supply supply device
It flows signal detecting method and corresponding by electric module, can be used in inductive power-supply supply device by the detecting of current signal
Electric current and drive signal time difference carry out interpretation loading level and metallic foreign body, and trigger level by automatic adjustment and believe with electric current
Number triggering obtain modulated signal, or by parse half period current signal difference to obtain modulated signal.
The present invention discloses a kind of current signal detection method, is used for a power supply module of an inductive power-supply supply device, institute
It includes a power supply coil and a resonant capacitance to state power supply module, and the method includes in the power supply coil and the resonant capacitance
Between concatenate a current detection component, with obtain corresponding to the power supply coil a current signal；And the parsing electric current
Signal, to take out the one of the inductive power-supply supply device data by electric module.
Invention additionally discloses a kind of power supply modules being used for an inductive power-supply supply device, including a power supply coil；One is humorous
Shake capacitance；One current detection component is serially connected between the power supply coil and the resonant capacitance, for obtaining corresponding to described
One current signal of the electric current of power supply coil；And a control unit, it is coupled to the current detection component, it is described for parsing
Current signal, to take out the one of the inductive power-supply supply device data by electric module.
Description of the drawings
Fig. 1 is the schematic diagram of one power supply module of the embodiment of the present invention.
Fig. 2 is the schematic diagram of an embodiment of the power supply module of Fig. 1.
Fig. 3 is that the waveform of drive signal and coil signal is illustrated under inductive power-supply supply device zero load of the embodiment of the present invention
Figure.
Fig. 4, which is inductive power-supply supply utensil of the embodiment of the present invention, has the waveform of the lower drive signal of load and coil signal to show
It is intended to.
Fig. 5 is the waveform signal of the fully loaded lower drive signal of inductive power-supply supply device of the embodiment of the present invention and coil signal
Figure.
Fig. 6 is drive signal and coil letter when inductive power-supply supply device receiving end of the embodiment of the present invention places metallic foreign body
Number schematic diagram.
Fig. 7 is the schematic diagram of another embodiment of power supply module.
Current signal and positive half cycle comparator output knot during Fig. 8 is signal of the embodiment of the present invention unmodulated period and modulation
The waveform diagram of fruit.
Current signal and positive half cycle comparator export the waveform signal of result during Fig. 9 is signal modulation of the embodiment of the present invention
Figure.
Figure 10 is the waveform diagram by current signal when noise jamming during signal modulation of the embodiment of the present invention.
Figure 11 is one with half-wave signa modulation function by the schematic diagram of electric module.
Figure 12 is the schematic diagram that the embodiment of the present invention carries out current signal when half-wave signa modulation.
Wherein, the reference numerals are as follows：
10 power 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 signals
121A, 121B driving device
123A, 123B switch on the bridge component
124A, 124B bridge switch component
210 power supply units
220 display units
230 current zero comparators
T switching cycles
702 signal interpretation circuits
A1, A2 amplifier
712,714 level generator
722 positive half cycle comparators
724 negative half period comparators
The positive phase voltage signals of VP
VN reverse voltage signals
VR1, VR2 reference voltage
R1, R2 export result
1100 by electric module
SP1 positive half cycle current signals
SN1 negative half-cycle current signals
Specific implementation mode
Referring to FIG. 1, Fig. 1 is the schematic diagram of one power supply module 10 of the embodiment of the present invention.As shown in Figure 1, power supply module 10
For an inductive power-supply supply device comprising a power supply coil 102, a resonant capacitance 104, a current detection component 106, one
Control unit 108 and one is for electric drive unit 110.Energy can be transmitted to receiving end in power supply coil 102, and receives and come from receiving end
Feedback signal.Resonant capacitance 104 then carries out resonance for power supply coil 102 of arranging in pairs or groups, to generate alternating electromagnetic energy.Electric current is examined
It surveys component 106 to be serially connected between power supply coil 102 and resonant capacitance 104, can be used to obtain corresponding to 102 electric current of power supply coil
One current signal S1.In general, current detection component 106 can be a current sense resistor, a Hall current sensor (Hall
Effect Current Sensor) or other types of current detector.Control unit 108 is coupled to current detection component
106, it can be used to parse current signal S1, and then the one of taking-up inductive power-supply supply device is by the data of electric module.For electric drive
Unit 110 is then used for that power supply coil 102 is driven to send energy.
Middle voltage signal or current signal must first carry out low-pass filtering before parsing compared to the prior art, mould of powering
Block 10 is not required to directly parse current signal S1 by filtering and obtains modulated signal, also that is, control unit 108 can be solved directly
Analyse the ac signal that coil generates.However, in ac signal, the method for taking out precision current value is very difficult, especially
It is in wireless charging system, the frequency of alternating current composition is higher and electric current is larger, thus does not allow disposable.In the case,
It can change and obtain modulated signal by way of whether taking out and compare size of current and generate trigger signal, additionally by electric current side
Load condition interpretation can be carried out to detection.
In one embodiment, power supply module 10 can obtain a load information by the change of current direction, to indicate to incude
The load condition of formula power supply unit, while judging whether the load end of inductive power-supply supply device has metallic foreign body.It please refers to
Fig. 2, Fig. 2 are the schematic diagram of an embodiment of the power supply module 10 of Fig. 1.It in this instance, can be to power supply for electric drive unit 110
Coil 102 carry out full-bridge driving, therefore for electric drive unit 110 include for electric drive unit 110A and 110B two parts, wherein
Include a driving device 121A, a switch on the bridge component 123A and a bridge switch component 124A for electric drive unit 110A, and
Include a driving device 121B, a switch on the bridge component 123B and a bridge switch component 124B for electric drive unit 110B.Separately
On the one hand, power supply module 10 further includes a power supply unit 210 and a display unit 220.Power supply unit 210 and display unit 220
Function mode have been disclosed in before case Chinese invention patent application number 201310228302.X, this will not be repeated here.
The load information of inductive power-supply supply device to be obtained can refer to the drive signal switching at 102 both ends of power supply coil
Time point and coil current zero time point.Referring to FIG. 3, Fig. 3 is inductive power-supply supply device of the embodiment of the present invention
The waveform diagram of zero load lower drive signal A, B and coil signal.Drive signal A and B power driving unit in order to control respectively
The switching signal of 110A and 110B can drive power supply coil 102 by the internal component for electric drive unit 110A and 110B
And resonant capacitance 104 generates resonance.Fig. 3 is by taking full-bridge drives as an example, i.e. switching signal reversed each other drive signal A and B.Such as figure
Shown in 3, drive signal A and B carries out electric current on power supply coil 102 and pulls, and in a no-load condition, the electric current across coil does not have
Meet obstructions, will present the waveform of triangular wave, and electric current can between power supply coil 102 and resonant capacitance 104 two way alternate stream
It is dynamic.When electric current two way alternate, a time point is currentless state, i.e. the time point of electric current zero.In each driving week
In phase T, electric current can all be zeroed twice.For drive signal A, when drive signal A is in high potential, represent what electric current up pushed away
Strength, after drive signal A is down to low potential, electric current also begins to conversion direction.In zero load, drive signal A switching electric potentials are extremely
The time of electric current zero is about a quarter of switching cycle T.
There are load lower drive signal A, B and line referring to FIG. 4, Fig. 4 is inductive power-supply supply utensil of the embodiment of the present invention
The waveform diagram of ring signal.As shown in figure 4, after plus load, because of power supply coil 102 and resonant capacitance 104 and receiving end
Coil and capacitance to generate resonance interactive, so electric current starts to generate variation.When load down, the time point meeting of electric current zero
Move closer to the time point that drive signal A switches to low potential.
Referring to FIG. 5, Fig. 5 is inductive power-supply supply device of the embodiment of the present invention fully loaded lower drive signal A, B and coil letter
Number waveform diagram.When inductive power-supply supply device full load, power supply module 10 has maximum thrust (i.e. maximum receiving end
Energy transfer), it is more than after this maximum value, power and charge efficiency can all decline.As shown in figure 5, under full-load conditions, driving
The time point of dynamic signal A switching electric potentials can be substantially equal to the time point of electric current zero.In addition, when inductive power-supply supply device overloads
When, the time point of drive signal A switching electric potentials then lags behind the time point of electric current zero.
Thus, which control unit 108 can be switched to time point and the electric current of low potential according to drive signal A by high potential
The time difference at the time point of zero judges the load condition of inductive power-supply supply device, and then obtains load information.When driving is believed
The time difference substantially the four of drive signal A switching cycles T at the time point of number A switching electric potentials and the time point of electric current zero/
For the moment, control unit 108 judges the load condition of inductive power-supply supply device for zero load；When drive signal A switching electric potentials
Between point with electric current zero time point time difference be less than drive signal A switching cycles T a quarter when, control unit 108
Judge that inductive power-supply supply utensil has load；And when the time point at the time point of drive signal A switching electric potentials and electric current zero
Time difference level off to zero when, control unit 108 then judges inductive power-supply supply device close to full load condition.On the other hand, by
In the voltage signal of drive signal B and drive signal A reverse phase each other, therefore also can be according to the time of drive signal B switching electric potentials
The time point that point is zeroed with electric current is judged that judgment mode is identical as the aforementioned judgment mode using drive signal A, herein
It does not repeat.
In this instance, current detection component 106 only obtains the time point of electric current zero at current transformation direction.In other words
It says, current detection component 106 takes out sense of current to carry out signal interpretation, can not consider size of current.Therefore, it is examined in electric current
A current zero comparator 230 can be arranged by surveying the output end of component 106, to generate a corresponding output according to sense of current
Value.For example, when electric current is positive, current zero comparator 230 exportable 1 (high potential)；When electric current is reversed, electricity
It flows zero comparator 230 and then exports 0 (low potential), since the information needed for control unit 108 is the time point of electric current zero, because
This need not limit which direction as forward direction.Thus, which current zero comparator 230 can transmit sense of current information
To control unit 108, and exclude size of current.And the letter that control unit 108 can be exported according to current zero comparator 230
Number, the time point of calculating current zero.
It is worth noting that, current signal S1 is not necessarily sent to the comparator or control unit of rear end as an electrical current,
Its may also in the form of voltage, digital form or other forms transmission.For example, in the above-described embodiments, current detecting group
Part 106 may include that a resistance is serially connected between power supply coil 102 and resonant capacitance 104, and current signal S1 can be resistance both ends
As a result, current signal S1 is sent to current zero comparator 230 by current detection component 106 again obtained by voltage subtracts each other, with
Zero potential is compared.In the case, current signal S1 is to correspond to a voltage form signal of coil current, and pass through
With the direction of the multilevel iudge coil current of zero potential.
In one embodiment, control unit 108 includes a timer, and the time point and driving for being used for calculating current zero believe
The time difference at the time point of number A and B switching electric potentials.When drive signal A and B switching electric potential, control unit 108 starts timer
And start timing.(i.e. the time point of electric current zero), control unit when current signal S1 is switched to 0 or switched to 1 by 0 by 1
108 stop timing.Then, control unit 108 can be according to the time span of timer acquirement and cutting for drive signal A and B
Cycle T is changed, judges the load condition of inductive power-supply supply device.
Whether under unloaded, heavy duty or full load condition, the size of current on power supply coil 102 is all not easy precisely to differentiate,
But the crosspoint of zero is certainly existed, this return-to-zero can be used to interpretation signal.In the case, since signal needs not move through
Filter process, the time also handled signal without waiting for filter before analytic signal, conversion speed can
Thus promoted.In addition, load state is necessarily limited to amplifier or the filtering of simulation in detection coil in compared to the prior art
The design of circuit carries out electric current could calculate with voltage analysis, and the present invention can analyze load state by timer, use
Part is less, therefore has many advantages, such as low cost and high-reliability.According to current signal processing technology, the speed of processor and
Therefore far above analog-converted processing circuit by the processing of control unit 108, signal processing can be substantially improved in timing ability
Ability.In addition to this, time difference interpretation mode of the invention can also be used to judge that load end whether there is metallic foreign body.
Referring to FIG. 6, Fig. 6 is that there are drive letter when metallic foreign body for inductive power-supply supply device receiving end of the embodiment of the present invention
The schematic diagram of number A, B and coil signal.As shown in fig. 6, when receiving end is there are when metallic foreign body, power supply coil 102 will produce pole
Big electric current and voltage change, however, since metallic foreign body can not generate resonance interaction with power supply coil 102, electric current
Phase is still identical as light condition, also that is, the time point four of the time point of electric current zero still backward drive signal A switching electric potentials divides
One of switching cycle T time.Thus, the time point that control unit 108 can be zeroed by size of current and electric current
Judge that receiving end whether there is metallic foreign body relative to the time point of drive signal A switching electric potentials.
It is worth noting that, the present invention can by detect power supply coil on curent change, obtained not via filtering by
The data at electric end, in the above-described embodiments, the data of acquirement can be the phase that load information or load end whether there is metallic foreign body
Close information.However, in wireless charging technology, the purpose for obtaining data is interpretation by modulation data, judges receiving end
Whether it is correct power receiving device.Therefore, in the examples below, will be believed by the electric current acquired by current detection component 106
Number S1 carries out interpretation for by modulated signal caused by electric module, and then obtains modulation data.
Referring to FIG. 7, Fig. 7 is the schematic diagram of another embodiment of power supply module 10.The framework of power supply module 10 in Fig. 7
It is similar with the power supply module 10 of Fig. 2, therefore component with the same function and signal are all indicated with the same symbol.Fig. 7's and Fig. 2
The main difference of power supply module 10 is that the power supply module 10 of Fig. 7 further includes a signal interpretation circuit 702, signal interpretation circuit
702 include amplifier A1 and A2, level generator 712 and 714, one positive half cycle comparator 722 and a negative half period comparator
724.Amplifier A1 and A2 can receive current signal S1, and will be corresponding to the part of forward current and reversely electric in current signal S1
The part of stream is amplified respectively, then is respectively converted into an a positive phase voltage signal VP and reverse voltage signal VN, wherein amplifier A1
Directly positive phase voltage signal VP is amplified and be converted in the part for corresponding to forward current in current signal S1, and A2 pairs of amplifier
Corresponding to the part of reverse current after reverse phase again amplify in current signal S1, to generate reverse voltage signal VN.Generally
For, since the current signal S1 that current detection component 106 obtains is smaller, it usually needs could be handled after amplification.And reverse phase
Signal can first switch to positive phase signals, so that back-end processor carries out signal processing.Level generator 712 and 714 is respectively intended to produce
Raw reference voltage VR1 and VR2.Positive half cycle comparator 722 may compare positive phase voltage signal VP and reference voltage VR1, and in positive
When voltage signal VP is more than reference voltage VR1, the positive half period part of modulated signal is triggered.Negative half period comparator 724 is comparable
Reverse voltage signal VN and reference voltage VR2, and when reverse voltage signal VN is more than reference voltage VR2, trigger modulated signal
Negative half cycle portion.
When being driven every time for electric drive unit 110, can be drawn mutually between power supply coil 102 and resonant capacitance 104
It pulls and resonance occurs, and generate alternating current.The electric current of alternating current can generate variation according to the difference of sensing situation and driving situation,
It changes can be converted to current signal S1 by current detection component 106, and due to coil current and current signal S1 all without
Low-pass filtering is crossed, therefore the signal that current signal S1 is high frequency, is not easy directly by analog-digital converter (Analog-to-
Digital Converter, ADC) it is converted to digital signal and is handled.In the case, a differentiation level can be first preset to make
For reference voltage VR1 or VR2, and by electric module unmodulated signal one it is specific during, it is big according to positive phase voltage signal VP
In reference voltage VR1 ratio or reverse voltage signal VN be more than reference voltage VR2 ratio, to reference voltage VR1 or VR2 into
Row adjustment.
By taking the signal resolution of positive half period as an example, referring to FIG. 8, Fig. 8 be signal of the embodiment of the present invention unmodulated period and
Current signal S1 and positive half cycle comparator 722 export the waveform diagram of result R1 during modulation.As shown in figure 8, by electric mould
It, can be upper and lower with noise or coil coupling state corresponding to the current signal S1 of coil current in a period of block unmodulated signal
Fluctuation, when current signal S1 is more than reference voltage VR1,722 exportable R1=1 of positive half cycle comparator, and work as current signal S1
When less than reference voltage VR1,722 exportable R1=0 of positive half cycle comparator.In this instance, control unit 108 can be by electric module
When unmodulated signal, check whether each current signal S1 is more than reference voltage VR1 and triggers just half during one is specific
All comparators 722 and produce output result R1=1, while calculating this specific period internal trigger and produce output result R1=1
Ratio.When the ratio of current signal S1 triggerings is higher, the level that reference voltage VR1 can be improved in control unit 108 makes triggering amount
It reduces；When the ratio of current signal S1 triggerings is relatively low, the level that control unit 108 can reduce reference voltage VR1 makes triggering amount
Increase；And under the moderate situation of the ratio of current signal S1 triggerings, control unit 108 then maintains the level of reference voltage VR1.
For example, 108 controllable current signal S1 of control unit is triggered and is exported the ratio of R1=1 and falls between 70%~80%,
If judge that the ratio that current signal S1 is triggered during one section is more than 80%, control unit 108 can improve reference voltage VR1
Level, to reduce the triggering amount of subsequent current signal S1；If judging, the ratio that current signal S1 is triggered during one section is less than
When 70%, control unit can reduce the level of reference voltage VR1, to improve the triggering amount of subsequent current signal S1.Thus,
When causing the increase of triggering amount when system noise is larger, the level that reference voltage VR1 can be improved in control unit 108 makes triggering amount subtract
It is few, and then noise is avoided to cause the erroneous judgement of modulated signal.
Referring to FIG. 9, Fig. 9 is defeated for current signal S1 and positive half cycle comparator 722 during signal modulation of the embodiment of the present invention
Go out the waveform diagram of result R1.Fig. 9 is by the waveform expansion during signal modulation in Fig. 8, to facilitate explanation.As described above,
After reference voltage VR1 settings are completed, if when receiving end unmodulated signal, current signal S1 is triggered within arbitrary a period of time
And the ratio for exporting R1=1 should be fallen 70%~80%.It (exports result R1 to hold if longer period of time occur and triggering not occurring
0) or few situation is measured in triggering continue, to indicate that receiving end has started modulated signal, as shown in Figure 9.During signal modulation, meeting
There are larger triggering amount (such as 70%~80%) in appearance a period of time, and the triggering amount in a period of time is minimum (such as less than
20%).In the case, control unit 108 can obtain modulated signal according to the triggering amount size during each section.This
Outside, during signal modulation, the still sustainable basis of level size of reference voltage VR1 is with touching in a period of larger triggering amount
Hair ratio is adjusted, to exclude noise jamming when system environments changes.
Referring to FIG. 10, Figure 10 is the wave by current signal S1 when noise jamming during signal modulation of the embodiment of the present invention
Shape schematic diagram.As shown in Figure 10, inductive power-supply supply device, can be because default or environmental factor make signal become in running
It obtains in a jumble, in the prior art, signal is required for being demodulated by filter, and signal jitter caused by noise may make
Demodulation result is indefinite.In comparison, embodiment through the invention, each drive cycle can obtain independent current signal
S1, and each current signal S1 can generate triggering or the definite result that does not trigger, control unit 108 can according to than
Judge the situation of signal modulation compared with the output result R1 or R2 of device.In addition, low-pass filter compared to the prior art need to make
Error is easy tod produce with more passive component (such as resistance, inductively or capacitively), the component that circuit of the invention uses is less,
And predominantly can high integration integrated circuit, therefore have higher stability.
It is worth noting that, the present invention can be in the case where not being filtered signal, directly according to the change of coil current
Change to obtain modulated signal.In one embodiment, control unit 108 can distinguish interpretation positive half period and the electric current of negative half-cycle becomes
Change, the part that forward current is corresponded in current signal S1 is separated with the part of reverse current and generates corresponding positive half cycle
After current signal and negative half-cycle current signal, further according to the difference interpretation modulated signal of the two.In Chinese invention patent application
In number 201210169832.7 and Chinese invention patent application number 201310228302.X, by electric module mainly with all-view signal
The mode of modulation carrys out modulation data.The present invention then uses half-wave signa modulator approach instead so that positive half cycle current signal and negative half period
Notable difference is generated between current signal.For example, please refer to Fig.1 1, Figure 11 be with half-wave signa modulation function one by
The schematic diagram of electric module 1100.As shown in figure 11, case Chinese invention patent application number before being similar to by the framework of electric module 1100
In Fig. 2 of 201310228302.X by electric module, therefore the identical component of function and signal are all indicated with the same symbol.By electricity
The main difference by electric module of module 1100 and Chinese invention patent application number 201310228302.X is, by electric module
1100 signal feedback circuit 23 does not include signal modulation resistance B3, control diode B4, Zener diode B5 and switch module
B6.Therefore, half-wave signa modulation is only carried out by signal modulation resistance A3 by electric module 1100.Other moulds in by electric module 1100
Block and component have been disclosed in Chinese invention patent application number 201310228302.X, and this will not be repeated here.
It is the schematic diagram that the embodiment of the present invention carries out current signal S1 when half-wave signa modulation to please refer to Fig.1 2, Figure 12.Such as
Shown in Figure 12, it is forward direction and reversed part that current signal S1 can be disassembled according to current direction, to generate 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
A degree of variable quantity is all persistently generated, this variable quantity may be caused by load or noise, and be modulated similar to all-view signal
Caused curent change.After receiving end proceeds by half-wave signa modulation, the variable quantity of negative half-cycle current signal SN1 is bright
It is aobvious to reduce, and only there is difference slightly in positive half cycle current signal SP1.In the case, control unit 108 can be according to just half
The signal difference of all current signal SP1 and negative half-cycle current signal SN1 carries out signal resolution.For example, control unit 108
It can judge when the difference of the change amount signal of positive half cycle current signal SP1 and negative half-cycle current signal SN1 is more than a critical value
Receiving end starts to read modulated signal just in modulated signal.It is worth noting that, receiving end signal feedback circuit not
The phase of semi-wave modulated is limited, therefore the current signal S1 variable quantities fed back on power supply coil 102 possibly are present at positive half cycle
Current signal SP1 or negative half-cycle current signal SN1, and 108 need of control unit find out difference between the two.
In conclusion the power supply module of the present invention can provide a kind of data receiver method.The method can detect power supply coil
On curent change, the data of receiving end are not obtained by filtering, this data may include the load of inductive power-supply supply device
The modulated signal etc. whether information, receiving end have the information of metallic foreign body or generated by electric module.The present invention is straight by processor
Each current signal of processing is connect, the resolution ratio of signal can be substantially improved, therefore processing speed also increases.Meanwhile not making
In the case of filter, the circuit unit inside power supply module is less, therefore has many advantages, such as low cost and high-reliability.
The foregoing is merely presently preferred embodiments of the present invention, all equivalent changes done according to the claims in the present invention with repair
Decorations should all belong to the covering scope of the present invention.
Claims (13)
1. a kind of current signal detection method is used for a power supply module of an inductive power-supply supply device, the power supply module packet
A power supply coil and a resonant capacitance are included, the method includes：
A current detection component is concatenated between the power supply coil and the resonant capacitance, corresponds to the supply lines to obtain
One current signal of the electric current of circle；And
The current signal is parsed, is believed by a modulation caused by electric module with take out the inductive power-supply supply device one
Number；
Wherein, it parses the current signal and is believed with taking out the modulation described in the inductive power-supply supply device by electric module
Number the step of include：
Amplify the part of a forward current and the part of a reverse current is corresponded in the current signal respectively, and turns respectively
It is changed to a positive phase voltage signal and a reverse voltage signal；
Set one first reference voltage and one second reference voltage；
According to it is described by electric module unmodulated signal one it is non-modulation during the positive phase voltage signal be more than it is described first join
Examine the ratio of voltage, adjust the size of first reference voltage, and according to it is described it is non-modulation during the reverse voltage believe
Number it is more than the ratio of second reference voltage, adjusts the size of second reference voltage；
During a signal modulation, the positive phase voltage signal and first reference voltage, to generate the modulation
One positive half period part of signal；And
During the signal modulation, the reverse voltage signal and second reference voltage, to generate the tune
One negative half cycle portion of signal processed.
2. current signal detection method as described in claim 1, which is characterized in that it is described to take out to parse the current signal
Inductive power-supply supply device it is described by including the step of the modulated signal caused by electric module：
Before taking out the modulated signal, the current signal is not filtered.
3. current signal detection method as described in claim 1, which is characterized in that when it is described it is non-modulation during the positive
When the ratio that voltage signal is more than first reference voltage is more than first critical value, the big of first reference voltage is improved
It is small, and when it is described it is non-modulation during the positive phase voltage signal be more than first reference voltage ratio face less than one second
When dividing value, the size of first reference voltage is reduced.
4. current signal detection method as described in claim 1, which is characterized in that when it is described it is non-modulation during the reverse phase
When the ratio that voltage signal is more than second reference voltage is more than a third critical value, the big of second reference voltage is improved
It is small, and when it is described it is non-modulation during the reverse voltage signal be more than second reference voltage ratio face less than one the 4th
When dividing value, the size of second reference voltage is reduced.
5. current signal detection method as described in claim 1, which is characterized in that further include：
A half-wave signal modulating method is used by electric module described in the inductive power-supply supply device, to generate the modulation
Signal；And
The current signal corresponding to the modulated signal is generated in the power supply coil, and according to the electricity of the power supply coil
Direction is flowed, the current signal is divided into a positive half cycle current signal and a negative half-cycle current signal.
6. current signal detection method as claimed in claim 5, which is characterized in that it is described to take out to parse the current signal
Inductive power-supply supply device it is described by including the step of the modulated signal caused by electric module：
The modulated signal is taken out by the variable quantity difference of the positive half cycle current signal and the negative half-cycle current signal.
7. a kind of power supply module for inductive power-supply supply device, including：
One power supply coil；
One resonant capacitance；
One current detection component is serially connected between the power supply coil and the resonant capacitance, for obtaining corresponding to the confession
One current signal of the electric current of electric coil；
One control unit is coupled to the current detection component, for parsing the current signal, to take out the induction type electricity
The one of source power supply unit is by a modulated signal caused by electric module；And
One signal interpretation circuit, including：
One first amplifier and one second amplifier are used for that the part and one of a forward current will be corresponded in the current signal
The part of reverse current is amplified respectively, and is respectively converted into a positive phase voltage signal and a reverse voltage signal；
One first level generator and one second level generator are respectively intended to one first reference voltage of setting and one second reference
Voltage；
One positive half cycle comparator is used for the positive phase voltage signal and the first reference electricity during a signal modulation
Pressure, to generate a positive half period part of the modulated signal；
And
One negative half period comparator is used for the reverse voltage signal and second reference during signal modulation
Voltage, to generate a negative half cycle portion of the modulated signal；
Wherein, described control unit according to it is described by electric module unmodulated signal one it is non-modulation during the positive phase voltage believe
Number it is more than the ratio of first reference voltage, adjusts the size of first reference voltage, and according to the non-modulation period
The interior reverse voltage signal is more than the ratio of second reference voltage, adjusts the size of second reference voltage.
8. power supply module as claimed in claim 7, which is characterized in that described control unit take out the modulated signal with
Before, the current signal is not filtered.
9. power supply module as claimed in claim 7, which is characterized in that when it is described it is non-modulation during the positive phase voltage signal
When ratio more than first reference voltage is more than first critical value, the size of first reference voltage is improved, and is worked as
It is described it is non-modulation during the positive phase voltage signal be more than first reference voltage ratio be less than second critical value when,
Reduce the size of first reference voltage.
10. power supply module as claimed in claim 7, which is characterized in that when it is described it is non-modulation during reverse voltage letter
When number being more than the ratio of second reference voltage and being more than a third critical value, the size of second reference voltage is improved, and
When it is described it is non-modulation during the reverse voltage signal be more than second reference voltage ratio be less than one the 4th critical value
When, reduce the size of second reference voltage.
11. power supply module as claimed in claim 7, which is characterized in that the inductive power-supply supply device it is described by electric mould
Block uses half-wave signa modulator approach, to generate the modulated signal.
12. power supply module as claimed in claim 11, which is characterized in that the power supply module, which generates, corresponds to modulation letter
Number the current signal, described control unit and according to the current direction of the power supply coil distinguishes the current signal
For a positive half cycle current signal and a negative half-cycle current signal.
13. power supply module as claimed in claim 12, which is characterized in that described control unit is believed by the positive half cycle current
The modulated signal is taken out number with the variable quantity difference of the negative half-cycle current signal.
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| Application Number | Priority Date | Filing Date | Title |
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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 |
| TW103100707 | 2014-01-08 | ||
| CN201410049320.6A CN103887895B (en) | 2014-01-08 | 2014-02-12 | Power supply module for induction type power supply and current signal detection method |
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| US9831687B2 (en) | 2011-02-01 | 2017-11-28 | Fu Da Tong Technology Co., Ltd. | Supplying-end module for induction-type power supply system and signal analysis circuit therein |
| US10630116B2 (en) | 2011-02-01 | 2020-04-21 | Fu Da Tong Technology Co., Ltd. | Intruding metal detection method for induction type power supply system and related supplying-end module |
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| TW201417445A (en) | 2014-05-01 |
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| TWI481144B (en) | 2015-04-11 |
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