CN108808869A - A kind of signal processing method of wireless charging system, receiving terminal and storage medium - Google Patents
A kind of signal processing method of wireless charging system, receiving terminal and storage medium Download PDFInfo
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- 238000003672 processing method Methods 0.000 title claims abstract description 43
- 238000005070 sampling Methods 0.000 claims description 9
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/40—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices
-
- H02J7/025—
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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
- H04B5/26—Inductive coupling using coils
- H04B5/266—One coil at each side, e.g. with primary and secondary coils
-
- 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
- H04B5/79—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes for data transfer in combination with power transfer
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
- H04L27/14—Demodulator circuits; Receiver circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
- H02J7/00045—Authentication, i.e. circuits for checking compatibility between one component, e.g. a battery or a battery charger, and another component, e.g. a power source
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Abstract
The invention discloses a kind of signal processing method of wireless charging system, receiving terminal and storage medium, the method includes：Signal on receiving coil is sent to the input terminal of the comparator of demodulation chip by receiving terminal, and the number of the sampled point in a cycle is sampled and obtained to the output valve of the comparator；Signal is demodulated according to the number of the sampled point in a cycle；Complete data frame is synthesized according to the demodulation result of signal；Complete data frame is verified and exported.The present invention utilizes band transmissions electric energy, is more in line with the fsk signal of QI standards, and at low cost, demodulation speed is fast, is easy to debug, and does not require whether communication carrier frequency fixes, and precision is higher.
Description
Technical field
Wireless charging technical field of the present invention more particularly to a kind of signal processing method of wireless charging system, receiving terminal
And storage medium.
Background technology
In QI（Qi is the " wireless of standardization body-wireless charging alliance release of the first promotion wireless charging technology in the whole world
Charging " standard, has two big feature of convenience and versatility）In the wireless charging device of standard, energy transmitting end is emitted to energy
The signal of communication of amount receiving terminal is transmitted by way of 2FSK (Binary Frequency Shift Keying), and different from traditional 2FSK signals
Be：According to the communications protocol of QI standards, the different phase of same system, communication carrier frequency Fop and modulating frequency Fmod is not
It is fixed, and the difference on the frequency between Fop and Fmod is smaller.
The wireless charging device of QI standards is transmitted not in course of normal operation by the energy signal of different frequency
Same power, and 2FSK signal communications are likely to occur in any energy signal Frequency point, and be guarantee transmission energy in QI standards
Periodic inequality-maximum value that amount stability defines carrier frequency Fop and modulating frequency Fmod is 282ns, minimum value is only 32ns.
Simultaneously as the signal that energy acceptance end is received in wireless charging system is the signal that inductive coupling comes, so as to cause it
The signal received is not single frequency sinusoidal signal, but may be doped with a large amount of high-frequency noises.
Traditional 2FSK demodulation methods are mainly coherent demodulation, filtering non-coherent demodulation and orthogonal multiplication non-coherent demodulation three
Kind mode；Due to the limitation of QI standard communication protocols, carrier frequency Fop and modulating frequency Fmod differences are smaller, if used
Conventional method is demodulated, and whole system just needs very high precision to differentiate different frequencies, no matter uses simulation or number
The word mode time will all increase greatly the cost of entire circuit；Meanwhile having in the different communication stage carrier frequency Fop of same system
It may be the arbitrary value between 110~205KHz, more considerably increase the cost of entire demodulating system.
That is, band transmissions electric energy can not be utilized in the prior art.
Therefore, the existing technology needs to be improved and developed.
Invention content
The technical problem to be solved in the present invention is, for prior art defect, the present invention provides a kind of wireless charging system
Signal processing method, receiving terminal and the storage medium of system, it is intended to band transmissions electric energy is utilized, realizes low cost, demodulation speed is fast,
It is easy to debug, does not require whether communication carrier frequency fixes, and precision is higher.
The technical proposal for solving the technical problem of the invention is as follows：
A kind of signal processing method of wireless charging system is applied to receiving terminal, wherein the wireless charging system includes transmitting
End and multiple receiving terminals, transmitting terminal transmit signals to multiple receiving terminals that certification connection is completed by transmitting coil；Transmitting terminal
Certification is identified by the ID number of receiving terminal, judges the reception whether receiving terminal within the scope of wireless charging has authorized
End；
The signal processing method of the receiving terminal includes：
Signal on receiving coil is sent to the input terminal of the comparator of demodulation chip by receiving terminal, the output to the comparator
Value is sampled and obtains the number of the sampled point in a cycle；
Signal is demodulated according to the number of the sampled point in a cycle；
According to the complete data frame of the demand selectivity synthesis of the demodulation result of signal and receiving terminal；
Verification is carried out to complete data frame and output verification is as a result, whether the load for being verified as judging to be connected is to award
Power carries out the load of wireless charging.
The signal processing method of the wireless charging system, wherein the receiving terminal sends out the signal on receiving coil
It send to the input terminal of the comparator of demodulation chip, the output valve of the comparator is sampled and obtains adopting in a cycle
The number of sampling point specifically includes：
Signal on receiving coil is sent to the input terminal of the comparator of demodulation chip；
The output valve of the comparator is read by 2MHz frequencies；
By the output valve of the comparator by the first low-pass filter to filter out high-frequency signal；
Sample and obtain the number of the sampled point in a cycle.
The signal processing method of the wireless charging system, wherein the output valve by the comparator passes through
One low-pass filter is specifically included with filtering out high-frequency signal：
By the output valve of the comparator by a cutoff frequency be 250KHz, sample frequency be 2MHz the first low-pass filter
To filter out high-frequency signal.
The signal processing method of the wireless charging system, wherein the sampling simultaneously obtains the sampling in a cycle
The number of point specifically includes：
Judge whether from 0 become 1 by the output valve of the comparator after the first low-pass filter；
If so, then exporting number of the count value of cycle rate counter as the sampled point in a cycle, and the period is counted
The count value of number device is revised as 1；
If not, after the count value of the cycle rate counter adds 1, the output that 2MHz frequencies read the comparator is continued through
Value.
The signal processing method of the wireless charging system, wherein of the sampled point according in a cycle
It is several to signal carry out demodulation specifically include：
According to the number of the sampled point in a cycle obtain the sampled point in multiple periods number and；
The wave portion up and down of the number sum of the sampled point in multiple periods is filtered out by the second low-pass filter；
According to the number of the sampled point in the multiple periods for filtering out upper and lower wave portion and detection frequency jitter；
If there is frequency jitter, then eliminates the frequency jitter and export bit 0 or bit 1；
If there is no frequency jitter, then bit 0 or bit 1 are exported.
The signal processing method of the wireless charging system, wherein of the sampled point according in a cycle
Number obtains the number of the sampled point in multiple periods and specifically includes：
Judge whether the cycle rate counter has output valve；
If the cycle rate counter has output valve, according to preset algorithm obtain 256 periods in sampled point number and：
The preset algorithm is：SumTbuff=SumTbuff+T_counter-Tbuffer [255]；
Wherein, SumTbuff be the sampled point in 256 periods number and, T_counter is the count value of cycle rate counter；
Tbuffer [255] is the 256th cache size of buffer Tbuffer, and wherein buffer Tbuffer is for storing cycle count
The depth of the output valve of device T_counter, the buffer Tbuffer is 256, and meets the rule of first in, first out；
Update the buffer Tbuffer；
If the cycle rate counter without output valve, continues to judge whether the cycle rate counter has output valve.
The signal processing method of the wireless charging system, wherein it is described filtered out by the second low-pass filter it is multiple
The wave portion up and down of the number sum of sampled point in period specifically includes：
Adopting in multiple periods is filtered out by the second low-pass filter that a cutoff frequency is 5KHz and sample frequency is 210KHz
The wave portion up and down of the number sum of sampling point.
The signal processing method of the wireless charging system, wherein
The previous value that the current value of second low-pass filter is subtracted to second low-pass filter is worked as with obtaining one
Preceding data value；
Judge whether Current data values are equal with previous data value；
If equal, data value counter adds 1, then judges whether the count value of data value counter is more than first threshold；
If unequal, data value counter O reset, then judge whether the count value of data value counter is more than first threshold；
If so, then by data value counter, data value accumulator and modify the count value of accumulator and reset, then by current number
It is assigned to previous data value according to value and Current data values are added in data value accumulator；
If not, Current data values are assigned to previous data value again and Current data values are added in data value accumulator；
Judge whether the absolute value of the accumulated value of data value accumulator is less than or equal to second threshold；
If so, then resetting the count value of the modification accumulator, and export；
If not, judging whether the absolute value of the accumulated value of Current data values accumulator is more than 31；
If the absolute value of the accumulated value of Current data values accumulator is more than 31, the accumulated value of Current data values accumulator is judged
Whether 0 is more than；
If the absolute value of the accumulated value of Current data values accumulator is not more than 31, the count value for modifying accumulator is revised as
The accumulated value of Current data values accumulator, and export；
If the accumulated value of Current data values accumulator is more than 0, the count value for modifying accumulator is revised as 31, and export；
If the accumulated value of Current data values accumulator is less than 0, the count value for modifying accumulator is revised as -31, and export.
A kind of receiving terminal, wherein the receiving terminal includes：It memory, processor and is stored on the memory and can
The signal handler of the wireless charging system run on the processor, the signal handler of the wireless charging system
The step of signal processing method of wireless charging system as described above being realized when being executed by the processor.
A kind of storage medium, wherein the storage medium is stored with the signal handler of wireless charging system, the nothing
The signal handler of micro USB electric system realizes the signal processing method of wireless charging system as described above when being executed by processor
The step of.
The invention discloses a kind of signal processing method of wireless charging system, receiving terminal and storage medium, the methods
Including：Signal on receiving coil is sent to the input terminal of the comparator of demodulation chip by receiving terminal, to the defeated of the comparator
Go out the number that value is sampled and obtains the sampled point in a cycle；According to the number of the sampled point in a cycle to signal
It is demodulated；Complete data frame is synthesized according to the demodulation result of signal；Complete data frame is verified and exported.This hair
It is bright to utilize band transmissions electric energy, it is more in line with the fsk signal of QI standards, and at low cost, demodulation speed is fast, is easy to debug, to logical
Whether letter carrier frequency, which fixes, does not require, and precision is higher.
Description of the drawings
Fig. 1 is the flow chart of the preferred embodiment of the signal processing method of wireless charging system of the present invention；
Fig. 2 be the signal processing method of wireless charging system of the present invention preferred embodiment in step S10 flow chart；
Fig. 3 be the signal processing method of wireless charging system of the present invention preferred embodiment in sample and obtain in a cycle
The flow chart of sampled point number；
Fig. 4 be the signal processing method of wireless charging system of the present invention preferred embodiment in step S20 flow chart；
Fig. 5 be the signal processing method of wireless charging system of the present invention preferred embodiment according to filtering out upper and lower wave portion
The flow chart of the number and detection frequency jitter of the sampled point in multiple periods；
Fig. 6 is the running environment schematic diagram of the preferred embodiment of receiving terminal of the present invention.
Specific implementation mode
To make the objectives, technical solutions, and advantages of the present invention clearer and more explicit, develop simultaneously embodiment pair referring to the drawings
The present invention is further described.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and do not have to
It is of the invention in limiting.
To make the objectives, technical solutions, and advantages of the present invention clearer and more explicit, develop simultaneously embodiment pair referring to the drawings
The present invention is further described.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and do not have to
It is of the invention in limiting.
The signal processing method of wireless charging system described in present pre-ferred embodiments, as shown in Figure 1, a kind of wireless charging
The signal processing method of electric system is applied to receiving terminal, wherein the wireless charging system includes transmitting terminal and multiple receptions
End, transmitting terminal transmit signals to multiple receiving terminals that certification connection is completed by transmitting coil；Transmitting terminal passes through receiving terminal
Certification is identified in ID number, judges the receiving terminal whether receiving terminal within the scope of wireless charging has authorized；The receiving terminal
Signal processing method include：
Step S10, the signal on receiving coil is sent to the input terminal of the comparator of demodulation chip by receiving terminal, to the comparison
The output valve of device is sampled and obtains the number of the sampled point in a cycle；
Step S20, signal is demodulated according to the number of the sampled point in a cycle；
Step S30, according to the complete data frame of demand selectivity synthesis of the demodulation result of signal and receiving terminal；
Step S40, verification is carried out and output verification to complete data frame as a result, described be verified as judging the load to be connected
Whether it is to authorize the load for carrying out wireless charging.
The signal processing method of the wireless charging system of the present invention has given up traditional 2FSK coherent demodulations and non-coherent demodulation
Customary practice, according to the characteristic of 2FSK signals in QI standards, artificial circuit part only with a comparator replace ADC sampling electricity
Road, while the demodulation to the fsk signal only can be realized in numerical portion highest with the clock frequency of 2MHz.
Specifically, in power wireless charging receiving terminal and communications protocol, since the mode that transmitting terminal generates sine wave is to pass through
PWM（Pulse Width Modulation, pulse width modulation）Control, the control output signal that this mode can be more prone to
Frequency and duty ratio, while also result in signal spectrum complexity, cannot be demodulated by general FSK modes.Due to PWM
Its duty ratio of modulation system is variation, but its period is changeless, therefore the present invention is counted by detecting the signal period,
And handled using the points as signal, to obtain coded data；Algorithm fixes the sum of 256 periods for process object, often
Detect that a cycle terminates, primary nearest the sum of 256 cycle counts of output, then according to should and value variation tendency into
Line number it is judged that.
Further, as shown in Fig. 2, the step S10 includes：
S11, the signal on receiving coil is sent to demodulation chip comparator input terminal；
S12, the output valve that the comparator is read by 2MHz frequencies；
S13, by the output valve of the comparator by the first low-pass filter to filter out high-frequency signal；
S14, sampling and the number for obtaining the sampled point in a cycle.
Wherein, the step S13 is specifically included:By the output valve of the comparator by a cutoff frequency be 250KHz,
Sample frequency is the first low-pass filter of 2MHz to filter out high-frequency signal.
Wherein, as shown in figure 3, the S14 is specifically included:
S141, judge whether from 0 become 1 by the output valve of the comparator after the first low-pass filter；
If by the output valve of the comparator after the first low-pass filter being S142, to become 1 from 0, cycle rate counter is exported
Number of the count value as the sampled point in a cycle, and the count value of the cycle rate counter is revised as 1；
If by the output valve of the comparator after the first low-pass filter not being S143, to become 1 from 0, then the cycle count
After the count value of device adds 1, the output valve that 2MHz frequencies read the comparator is continued through.
Wherein, 0 original signal source code is indicated, 1 indicates the signal code that after-treatment is completed.
In practical applications, the signal on coil enters chip after by comparator compared with 0 level, passes through 2MHz
Frequency read comparator output valve, then the value can be considered the 1bit sampled datas of 2MHz, for ensure input signal waveform its tremble
It is dynamic to be unlikely to influence subsequent decoding algorithm, this data is first crossed into a low-pass filter, filters out the higher dither waveform of its frequency
Then shape carries out demodulation and decoding again.
Wherein, T_counter is cycle rate counter, and length 5bit encounters rising every time by fixed frequency counting
It is counted again along output data and resetting, without considering overflow problem in counting process.
Further, as shown in figure 4, the step S20 includes：
S21, the number that the sampled point in multiple periods is obtained according to the number of the sampled point in a cycle and；
S22, filtered out by the second low-pass filter the sampled point in multiple periods number sum wave portion up and down；
S23, basis filter out number and the detection frequency jitter of the sampled point in multiple periods of upper and lower wave portion；
S24, if there is frequency jitter, then eliminate the frequency jitter and export bit 0 or bit 1；
S25, if there is no frequency jitter, then export bit 0 or bit 1.
Wherein, at this time bit 0 and bit 1 is to represent electric power signal by forming letter after the completion of after-treatment in frequency range
Number code.
Wherein, the step S21 is specifically included：Judge whether the cycle rate counter has output valve；If the period
Counter has output valve, then according to preset algorithm obtain 256 periods in sampled point number and；The preset algorithm is：
SumTbuff=SumTbuff+T_counter-Tbuffer [255]；
Wherein, SumTbuff be the sampled point in 256 periods number and, T_counter is the count value of cycle rate counter；
Tbuffer [255] is the 256th cache size of buffer Tbuffer, and wherein buffer Tbuffer is for storing cycle count
The depth of the output valve of device T_counter, the buffer Tbuffer is 256, and meets the rule of first in, first out；
Update the buffer Tbuffer；If the cycle rate counter without output valve, continues to judge the cycle rate counter
Whether output valve is had.
Wherein, the step S22 is specifically included:By a cutoff frequency be 5KHz and sample frequency is 210KHz
Two low-pass filters filter out the wave portion up and down of the number sum of the sampled point in multiple periods.
Further, as shown in figure 5, the step S23 is specifically included：
S231, the current value of second low-pass filter is subtracted into the previous value of second low-pass filter to obtain
One current data（delta）Value；
Wherein, delta indicates the judgement data in a kind of programming；
S232, judge current data（delta）Whether value is equal with previous data value；
If S233, current data（delta）Value and previous data（delta）It is worth equal, then data（delta）It is worth counter
Add 1, then executes S235；
If S234, current data（delta）Value and previous data（delta）It is worth unequal, then data（delta）Value counts
Device is reset, then executes S235；
S235, judge data（delta）Whether the count value for being worth counter is more than first threshold；
If S236, data（delta）The count value for being worth counter is more than first threshold, then by data（delta）Value counter,
Data（delta）Value accumulator and the count value for modifying accumulator are reset, then execute S237；If data（delta）Value
The count value of counter is not more than first threshold, then directly executes S237；
S237, by current data（delta）Value is assigned to previous data（delta）Value and by current data（delta）Value is cumulative
To data（delta）It is worth in accumulator；
S238, judge data（delta）Whether the absolute value for being worth the accumulated value of accumulator is less than or equal to second threshold；
If S239, current data（delta）The absolute value for being worth the accumulated value of accumulator is less than or equal to second threshold, then resets institute
The count value of modification accumulator is stated, and is exported；
If S240, current data（delta）The absolute value of the accumulated value of value accumulator is not below or equal to second threshold, then judges
Current data（delta）Whether the absolute value for being worth the accumulated value of accumulator is more than 31；
Wherein, " 31 " are immutable, because 31 be a preset parameter in frequency signal and electric power signal conversion are constituted
Fiducial value；
If S241, current data（delta）The absolute value for being worth the accumulated value of accumulator is more than 31, then judges current data
（delta）Whether the accumulated value for being worth accumulator is more than 0；
If the absolute value of the accumulated value of S242, Current data values accumulator is not more than 31, the count value of accumulator will be modified
It is revised as the accumulated value of Current data values accumulator, and is exported；
If S243, current data（delta）The accumulated value for being worth accumulator is more than 0, then changes the count value for modifying accumulator
It is 31, and exports；
If S244, current data（delta）The accumulated value for being worth accumulator is less than 0, then changes the count value for modifying accumulator
It is -31, and exports.
Wherein, first threshold and second threshold are constant, and Tbuffe is cycle count Tbuffer, for preserving T_
The output valve depth of counter is 256, first in, first out；SumTbuff is the sum of cycle count Tbuffer member, it is determined as
15bit, initial value are -2840；If counter T_counter has output, calculate first 256 nearest periods points it
With then by output valve deposit cycle count Tbuffer, after this with the sum of cycle count Tbuffer member
SumTbuff is that object carries out subsequent processing.
SumTbuff is the sum of 256 period points, because providing that initial Fop is 170~180KHz in Qi standards,
And 256 × 2MHz ÷ 180KHz ≈ 2844, so be reduce starting stage SumTbuff in DC component by its initial value be-
2840.Due to sampling and interfering etc., even in the case of simple signal, SumTbuff data also necessarily will appear one
Fixed fluctuation, this sentences SumTbuff as an input signal, and the fluctuation up and down of points sum can be considered frequency higher position
Noise.
Therefore in entire processing procedure first by low-pass filter LPF2 by SumTbuff count sum wave up and down
Dynamic part is smoothed.SumTbuff curves its reflection after smooth be frequency variation, it is poor to be carried out at this time
Point；Differentiated signal is handled simultaneously, to the shake and biasing in elimination and value, only remaining changing value, to carry out
Judge.
The signal processing method of the wireless charging system of the present invention does not need complicated analog circuit, digital circuit portion
Highest frequency required by point also only has 2MHz, and there was only simple add operation under the frequency, and groundwork frequency exists
210KHz or less.Compared to existing FSK coding/decoding methods, the realization of this method more agrees with the fsk signal of QI standards, and cost
Low, demodulation speed is fast, is easy to debug, and does not require whether Fop fixes, and precision is higher.
Further, as shown in fig. 6, the signal processing method based on above-mentioned wireless charging system, the present invention also accordingly carry
A kind of receiving terminal is supplied（Can be the electronic products such as smart mobile phone）, the receiving terminal includes processor 10, memory 20 and aobvious
Show device 30.Fig. 6 illustrates only the members of receiving terminal, it should be understood that be not required for implementing all components shown,
The implementation that can be substituted is more or less component.
The memory 20 can be the internal storage unit of the receiving terminal in some embodiments, such as receiving terminal
Hard disk or memory.The memory 20 can also be the External memory equipment of the receiving terminal in further embodiments, such as
The plug-in type hard disk being equipped on the receiving terminal, intelligent memory card（Smart Media Card, SMC）, secure digital
（Secure Digital, SD）Card, flash card（Flash Card）Deng.Further, the memory 20 can also both include
The internal storage unit of institute's receiving terminal also includes External memory equipment.The memory 20 is installed on the receiving terminal for storing
Application software and Various types of data, such as it is described installation receiving terminal program code etc..The memory 20 can be also used for temporarily
When store the data that has exported or will export.In one embodiment, it is stored with wireless charging system on memory 20
Signal handler 40, the signal handler 40 of the wireless charging system can be performed by processor 10, to realize this
The signal processing method of wireless charging system in application.
The processor 10 can be a central processing unit in some embodiments（Central Processing Unit,
CPU）, microprocessor or other data processing chips, for running the program code stored in the memory 20 or processing number
According to, such as execute the signal processing method etc. of the wireless charging system.
The display 30 can be light-emitting diode display, liquid crystal display, touch-control liquid crystal display in some embodiments
And OLED（Organic Light-Emitting Diode, Organic Light Emitting Diode）Touch device etc..The display 30 is used
In the information for being shown in the receiving terminal and for showing visual user interface.The component 10-30 of the receiving terminal is logical
System bus is crossed to be in communication with each other.
In one embodiment, when processor 10 executes the signal handler 40 of wireless charging system in the memory 20
Shi Shixian following steps：
Signal on receiving coil is sent to the input terminal of the comparator of demodulation chip by receiving terminal, the output to the comparator
Value is sampled and obtains the number of the sampled point in a cycle；
Signal is demodulated according to the number of the sampled point in a cycle；
Complete data frame is synthesized according to the demodulation result of signal；
Complete data frame is verified and exported.
The present invention also provides a kind of storage mediums, wherein the storage medium is stored at the signal of wireless charging system
Program is managed, the signal handler of the wireless charging system realizes the signal of the wireless charging system when being executed by processor
The step of processing method；As detailed above.
In conclusion the present invention provides a kind of signal processing method of wireless charging system, receiving terminal and storage medium, institute
The method of stating includes：Signal on receiving coil is sent to the input terminal of the comparator of demodulation chip by receiving terminal, to the comparison
The output valve of device is sampled and obtains the number of the sampled point in a cycle；According to the number of the sampled point in a cycle
Signal is demodulated；Complete data frame is synthesized according to the demodulation result of signal；To complete data frame carry out verification and it is defeated
Go out.The present invention utilizes band transmissions electric energy, is more in line with the fsk signal of QI standards, and at low cost, demodulation speed is fast, is easy to adjust
Examination, does not require whether communication carrier frequency fixes, and precision is higher.
Certainly, one of ordinary skill in the art will appreciate that realizing all or part of flow in above-described embodiment method,
It is that can instruct related hardware by computer program（Such as processor, controller etc.）It completes, the program can store
In a computer-readable storage medium, described program may include the flow such as above-mentioned each method embodiment when being executed.
Wherein the storage medium can be memory, magnetic disc, CD etc..
It should be understood that the application of the present invention is not limited to the above for those of ordinary skills can
With improvement or transformation based on the above description, all these modifications and variations should all belong to the guarantor of appended claims of the present invention
Protect range.
Claims (10)
1. a kind of signal processing method of wireless charging system is applied to receiving terminal, which is characterized in that the wireless charging system
Including transmitting terminal and multiple receiving terminals, transmitting terminal transmits signals to multiple receptions that certification connection is completed by transmitting coil
End；Certification is identified by the ID number of receiving terminal in transmitting terminal, judges whether the receiving terminal within the scope of wireless charging has been awarded
The receiving terminal of power；
The signal processing method of the receiving terminal includes：
Signal on receiving coil is sent to the input terminal of the comparator of demodulation chip by receiving terminal, the output to the comparator
Value is sampled and obtains the number of the sampled point in a cycle；
Signal is demodulated according to the number of the sampled point in a cycle；
According to the complete data frame of the demand selectivity synthesis of the demodulation result of signal and receiving terminal；
Verification is carried out to complete data frame and output verification is as a result, whether the load for being verified as judging to be connected is to award
Power carries out the load of wireless charging.
2. the signal processing method of wireless charging system according to claim 1, which is characterized in that the receiving terminal will connect
Signal on take-up circle is sent to the input terminal of the comparator of demodulation chip, and the output valve of the comparator is sampled and obtained
The number of the sampled point in a cycle is taken to specifically include：
Signal on receiving coil is sent to the input terminal of the comparator of demodulation chip；
The output valve of the comparator is read by 2MHz frequencies；
By the output valve of the comparator by the first low-pass filter to filter out high-frequency signal；
Sample and obtain the number of the sampled point in a cycle.
3. the signal processing method of wireless charging system according to claim 2, which is characterized in that described by the comparison
The output valve of device is specifically included by the first low-pass filter with filtering out high-frequency signal：
By the output valve of the comparator by a cutoff frequency be 250KHz, sample frequency be 2MHz the first low-pass filter
To filter out high-frequency signal.
4. the signal processing method of wireless charging system according to claim 2, which is characterized in that the sampling simultaneously obtains
The number of sampled point in a cycle specifically includes：
Judge whether from 0 become 1 by the output valve of the comparator after the first low-pass filter；
If so, then exporting number of the count value of cycle rate counter as the sampled point in a cycle, and the period is counted
The count value of number device is revised as 1；
If not, after the count value of the cycle rate counter adds 1, the output that 2MHz frequencies read the comparator is continued through
Value.
5. the signal processing method of wireless charging system according to claim 1, which is characterized in that described according to a week
The number of sampled point in phase carries out demodulation to signal and specifically includes：
According to the number of the sampled point in a cycle obtain the sampled point in multiple periods number and；
The wave portion up and down of the number sum of the sampled point in multiple periods is filtered out by the second low-pass filter；
According to the number of the sampled point in the multiple periods for filtering out upper and lower wave portion and detection frequency jitter；
If there is frequency jitter, then eliminates the frequency jitter and export bit 0 or bit 1；
If there is no frequency jitter, then bit 0 or bit 1 are exported.
6. the signal processing method of wireless charging system according to claim 5, which is characterized in that described according to a week
The number of sampled point in phase obtains the number of the sampled point in multiple periods and specifically includes：
Judge whether the cycle rate counter has output valve；
If the cycle rate counter has output valve, according to preset algorithm obtain 256 periods in sampled point number and；
The preset algorithm is：SumTbuff=SumTbuff+T_counter-Tbuffer [255]；
Wherein, SumTbuff be the sampled point in 256 periods number and, T_counter is the count value of cycle rate counter；
Tbuffer [255] is the 256th cache size of buffer Tbuffer, and wherein buffer Tbuffer is for storing cycle count
The depth of the output valve of device T_counter, the buffer Tbuffer is 256, and meets the rule of first in, first out；
Update the buffer Tbuffer；
If the cycle rate counter without output valve, continues to judge whether the cycle rate counter has output valve.
7. the signal processing method of wireless charging system according to claim 5, which is characterized in that described low by second
The wave portion up and down that bandpass filter filters out the number sum of the sampled point in multiple periods specifically includes：
Adopting in multiple periods is filtered out by the second low-pass filter that a cutoff frequency is 5KHz and sample frequency is 210KHz
The wave portion up and down of the number sum of sampling point.
8. the signal processing method of wireless charging system according to claim 5, which is characterized in that the basis filters out
The number of the sampled point in multiple periods of lower wave portion and detection frequency jitter specifically include：
The previous value that the current value of second low-pass filter is subtracted to second low-pass filter is worked as with obtaining one
Preceding data value；
Judge whether Current data values are equal with previous data value；
If equal, data value counter adds 1, then judges whether the count value of data value counter is more than first threshold；
If unequal, data value counter O reset, then judge whether the count value of data value counter is more than first threshold；
If so, then by data value counter, data value accumulator and modify the count value of accumulator and reset, then by current number
It is assigned to previous data value according to value and Current data values are added in data value accumulator；
If not, Current data values are assigned to previous data value again and Current data values are added in data value accumulator；
Judge whether the absolute value of the accumulated value of data value accumulator is less than or equal to second threshold；
If so, then resetting the count value of the modification accumulator, and export；
If not, judging whether the absolute value of the accumulated value of Current data values accumulator is more than 31；
If the absolute value of the accumulated value of Current data values accumulator is more than 31, the accumulated value of Current data values accumulator is judged
Whether 0 is more than；
If the absolute value of the accumulated value of Current data values accumulator is not more than 31, the count value for modifying accumulator is revised as
The accumulated value of Current data values accumulator, and export；
If the accumulated value of Current data values accumulator is more than 0, the count value for modifying accumulator is revised as 31, and export；
If the accumulated value of Current data values accumulator is less than 0, the count value for modifying accumulator is revised as -31, and export.
9. a kind of receiving terminal, which is characterized in that the receiving terminal includes：It memory, processor and is stored on the memory
And the signal handler for the wireless charging system that can be run on the processor, the signal processing of the wireless charging system
The signal processing method such as claim 1-8 any one of them wireless charging systems is realized when program is executed by the processor
The step of.
10. a kind of storage medium, which is characterized in that the storage medium is stored with the signal handler of wireless charging system,
Any one of the claim 1-8 wireless chargings are realized when the signal handler of the wireless charging system is executed by processor
The step of signal processing method of system.
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