CN108808888A - A kind of wireless charging system and its resonance compensation shunt method - Google Patents
A kind of wireless charging system and its resonance compensation shunt method Download PDFInfo
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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
- H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
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Abstract
The invention discloses a kind of wireless charging system and its resonance compensation shunt methods, the wireless charging system includes transmitting terminal, LC resonance termination power, receiving terminal and frequency tracking apparatus, and the frequency tracking apparatus includes the high-frequency current detection circuit being sequentially connected in series, phase voltage compensation circuit, phaselocked loop and driving circuit.When the present invention detects that the inductance value of launching circuit changes by current transformer, frequency tracking apparatus is compensated according to the phase difference of electric current and voltage in driving circuit, the output voltage for controlling driving circuit adjust automatically transmitting terminal, improves the efficiency of transmission of wireless charging system.
Description
Technical field
The present invention relates to wireless charging technical fields, and in particular to a kind of wireless charging system and its resonance compensation shunting side
Method.
Background technology
Resonant wireless power transmission concept was proposed by tesla before more than 100 years.With power electronic technique in recent years
Continuous development, its cost of wireless charging device constantly reduces, and charge efficiency is suitable with contact charging.Due to wireless charging
Its convenience and safety so that relevant market is grown rapidly.The wireless charging device of low-power, has begun in Mobile portable
The fields such as equipment, implantable medical devices are promoted, and the field electric energy transimission power is according to concrete application from several milliwatts to tens watts
Differ.It charges in high-power wireless, electric energy transimission power is developed slowly up to kilowatt rank due to the increase of its technical difficulty.
High-power wireless charges, and is mainly used in the load battery charging to miniature electrical equipment at present, but there are radio energies
The course continuation mileage of transmission is short, it is with high costs the problems such as, this will the serious following miniature electrical equipment of limitation sales volume.
Currently, wireless power transmission, is to transmit energy by a pair of coil that there is coupling.Due between coil
There are larger gaps, are loose couplings between transmitting coil and receiving coil, the coefficient of coup is small, and leakage inductance is very big.In order to improve
Efficiency of transmission, and the capacity of converters is reduced, carry out the mode of bucking coil leakage inductance usually using capacitance is increased, and allow
Increase receiving coil and transmitting coil method after capacitance to be operated under resonance state.However, existing capacitance compensation mode,
When being transmitted applied to high-power wireless electric energy, there are following bottlenecks：First is that transimission power is small, second be efficiency of transmission compared with
Low, third is the complexity that resonant frequency point does not stop that variation causes operation and control with working condition.
Therefore, the prior art needs to be improved and developed.
Invention content
Based on this, it is necessary to which for current wireless power transmission, transmission efficiency is low and problem complicated for operation, provides one
Kind wireless charging system and its resonance compensation shunt method, it is intended to when there are phase differences between electric current and voltage in driving circuit
When, certain control voltage is exported by phaselocked loop and makes tranmitting frequency that LC resonance coupling frequency be followed to change, realizes that resonance is consistent,
Improve efficiency of transmission.
In order to achieve the above object, this invention takes following technical schemes：
The present invention provides a kind of wireless charging system, and the wireless charging system includes：
Transmitting terminal, wireless electric energy transmission device, receiving terminal and frequency tracing control device；
The transmitting terminal includes the DC power supply for power supply and the high-frequency resonant inverter that is connect with DC power supply both ends；
The wireless electric energy transmission device includes the LC resonance termination power for transmitting electric energy；
The receiving terminal includes at least one terminal for receiving radio energy；
The frequency tracing control device include the high-frequency current detection circuit being sequentially connected in series, phase voltage compensation circuit,
Phaselocked loop control circuit of phase locking and driving circuit；
The transmitting terminal, the wireless electric energy transmission device and the receiving terminal are sequentially connected；The frequency-tracking control
Device processed is separately connected transmitting terminal and the wireless electric energy transmission device；
When high-frequency current detection circuit detects that the inductance value of launching circuit generates variation, frequency tracking apparatus is according to electric current
It is compensated with the phase difference of voltage, the output voltage of adjust automatically transmitting terminal, so that efficiency of transmission reaches desired value.
The wireless charging system, wherein the LC resonance termination power includes the first resonant inductance circuit and second
Resonant inductance circuit, the first resonant inductance circuit include first resistor, the first capacitance and the first inductance coil, and described
Two resonant inductance circuits include second resistance, the second capacitance and the second inductance coil, first inductance coil and described the
Two inductance coils form the coupling of inductance resonance, the DC power supply, the high-frequency resonant inverter and first resonant inductance
Circuit is in turn connected to form launching circuit, and the second resonant inductance circuit is in turn connected to form with the receiving terminal to be received back
Road.
The wireless charging system, wherein the high-frequency current detection circuit include current transformer, measured resistance,
3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance and differential transport and placing device；One end of 5th resistance is altogether, another
Intersect the anode for being connected to the differential transport and placing device input terminal with the 4th resistance in end；The 3rd resistor and the 6th resistance phase
Commissure is connected to the cathode of the differential transport and placing device input terminal；The 3rd resistor and the 4th resistor coupled in parallel, with measured resistance
Series connection.
The wireless charging system, wherein the phase voltage compensation circuit include the first diode, the 7th resistance,
8th resistance, adjustable resistance and comparator；First diode one end connects the output end of the differential transport and placing device, another
The 7th resistance of end connection；7th resistance is connected with first diode and the 8th resistance, in parallel with the adjustable resistance,
And meet at the anode of the comparator；The cathode of the comparator connects the 8th resistance.
The wireless charging system, wherein the phaselocked loop control circuit of phase locking includes the locking phase with voltage controlled oscillator
Ring core piece, eleventh resistor, twelfth resistor and third capacitance；14th pin of the phase-locked loop chip connects the comparison
Device, the 11st pin connect the eleventh resistor, and the 12nd pin connects the twelfth resistor, and the 4th pin connects the driving
Circuit, the 6th pin and the 7th pin are connected to the both ends of the third capacitance；The power end of the phase-locked loop chip connects
Power supply；The eleventh resistor is in parallel with twelfth resistor, and ground connection altogether.
The wireless charging system, wherein the phaselocked loop control circuit of phase locking further includes self-start circuit, it is described from
Start-up circuit includes thirteenth resistor, the 14th resistance, the 5th capacitance and the second diode, described thirteenth resistor one end with
14th resistance is connected in series in ground, and the other end connects power supply, and the both ends of the 5th capacitance are connected to the described tenth
Three resistance, second diode connect the 9th pin of the phase-locked loop chip.
The wireless charging system, wherein the phase-locked loop chip is 74HC4046 phase-locked loop chips, including the first mirror
Phase device, the second phase discriminator, third phase discriminator, passive filter and voltage controlled oscillator.
The wireless charging system, wherein the high-frequency resonant inverter is that the two-tube inductance capacitance resonance of high frequency E class is inverse
Become device；The driving circuit includes pwm driver；The desired value is that electric energy efficiency of transmission is not less than 96%.
The resonance compensation shunt method of a kind of wireless charging system provided by the invention, for realizing wireless charging described above
Electric system, wherein the resonance compensation shunt method of the wireless charging system includes the following steps：
Start DC power supply, the electric current of launching circuit is detected in real time, to detect whether inductance value changes；
When detecting that the inductance value changes, the electric current of launching circuit is obtained, and is converted to signal voltage output；
The signal voltage is obtained into differential amplified voltage after the amplification of differential transport and placing device；
By the differential amplified voltage compared with predeterminated voltage, according to comparison result, carried out through phase voltage compensation circuit
Phase compensation, output phase offset voltage；
Phase-locked loop chip is according to the phase compensation voltage of output, the output voltage of adjust automatically transmitting terminal, so that transmission is imitated
Rate reaches desired value.
The resonance compensation shunt method of the wireless charging system, wherein the predeterminated voltage is the differential amplification
The DC reference voltage obtained after voltage is rectified；The desired value is that electric energy efficiency of transmission is not less than 96%.
Compared to the prior art, the advantageous effect that the present invention realizes：
1. detection transmitting coil output frequency in real time, synchronized tracking emits source frequency to LC radiating circuits natural resonance frequency
Rate.
2. realizing that efficiency of transmission is high, transimission power is big through the invention, and resonant frequency point does not make with working condition variation
The method of obtaining control is complicated.
3. ensureing that radio energy is received to greatest extent, avoid system detuning.
Description of the drawings
Fig. 1 is a kind of structure chart of wireless charging system of an embodiment provided by the invention.
Fig. 2 is a kind of structure chart of wireless charging system of another embodiment provided by the invention.
Fig. 3 is the LC resonance termination power figure in the wireless charging system of the present invention.
Fig. 4 be the present invention wireless charging system in the first inductance coil and efficiency of transmission relational graph.
Fig. 5 be the present invention wireless charging system in the second inductance coil and efficiency of transmission relational graph.
Fig. 6 be the present invention wireless charging system in resonant frequency and efficiency of transmission relational graph.
Fig. 7 be the present invention wireless charging system in transmission range and efficiency of transmission relational graph.
Fig. 8 is the wireless charging system high-frequency current detection circuit figure of the present invention.
Fig. 9 be the present invention wireless charging system in phase voltage compensation circuit figure.
Figure 10 be the present invention wireless charging system in phase voltage compensation circuit voltage oscillogram.
Figure 11 be the present invention wireless charging system in phaselocked loop control circuit of phase locking figure.
Figure 12-Figure 15 is the oscillogram of the wireless charging system vcoout and vc at different frequencies of the present invention.
Figure 16 is the wireless charging system of the present invention in three output voltage waveforms of default following range.
Figure 17-Figure 18 be the present invention wireless charging system in there is corresponding with the no frequency-tracking load of frequency-tracking to export
Voltage oscillogram.
Figure 19 is the wireless charging system of the present invention tracking transmission effect corresponding with no tracking frequency under different distance
Rate curve graph.
Figure 20 is the resonance compensation shunt method flow chart of the wireless charging system 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.
Please refer to Fig.1 and Fig. 2, Fig. 1 be an embodiment provided by the invention a kind of wireless charging system structure chart, such as
Shown in Fig. 1, the wireless charging system includes：Transmitting terminal 1 and n receiving terminal 3 (n >=1, n are positive integer), each transmitting terminal
It is respectively connected with MCU with receiving terminal 3, is used for transmission the identification of frequency range (such as transmission band is between 1.2HZ-5.8GHZ), to ensure
Receiving terminal is suitble to charge and signal processing；Transmitting terminal 1 transmits signals to multiple the connecing that certification connection is completed by transmitting coil
Receiving end 3；Certification is identified by the ID number of receiving terminal in transmitting terminal 1, whether judges the receiving terminal 3 being within the scope of wireless charging
The receiving terminal authorized.
Transmitting terminal 1 sends electric energy to receiving terminal 3, and energy transmission efficiency can increase with receiving terminal distance with transmitting terminal and be subtracted
Small, distance is bigger, and barrier is more, and radio energy receiving end absorbs just few, then during radio transmission, hair
It penetrates the electromagnetic field that end 1 is formed with receiving terminal 3 also to decay rapidly with distance, causes two circuits for generating resonance coupling (as sent out
It is emitted back towards road and receives circuit) tranmitting frequency and resonant frequency be inconsistent (there are phase differences with voltage for electric current), i.e., and detuning waste is electric
Energy.
In order to ensure emit frequency domain it is consistent with resonant frequency, namely raising wireless charging system efficiency of transmission, such as Fig. 2 institutes
Show, Fig. 2 is a kind of structure chart of wireless charging system of another embodiment provided by the invention, the wireless charging system packet
It includes：
Transmitting terminal 10, wireless electric energy transmission device 20, receiving terminal 30 and frequency tracing control device 40, specially：
The transmitting terminal 10 includes the DC power supply for power supply and the high-frequency resonant inversion that is connect with DC power supply both ends
Device；Wherein, the high-frequency resonant inverter is the two-tube inverter of high frequency E class, for being adjusted by adjusting the frequency of output voltage
It saves the power factor of load equipment or adjusts the virtual value size of output voltage to adjust output power, function is equal to high frequency
Transformer can also improve wireless transmission distance in this way, both having reduced transformer consume.
The wireless electric energy transmission device includes the LC resonance termination power 20 for transmitting electric energy, i.e., series resonance couples
Circuit, inductance capacitance resonant coupling circuit, being used for will be inverse through high-frequency resonant by the resonant inductor mutual inductance in certain distance
The inversion electric energy of change is sent to receiving terminal so that receiving terminal receives the inversion electric energy and carries out wireless charging.
The receiving terminal 30 includes at least one for receiving the terminal of radio energy, i.e. load equipment, as mobile terminal,
Resistance, LED light etc., in the present invention, in a certain range, until multipotency carries 8 load terminals for charging, wherein the model
Enclose is 0-10 meters.
The frequency tracing control device 40 includes the high-frequency current detection circuit 401 being sequentially connected in series, phase voltage compensation
Circuit 402, phaselocked loop control circuit of phase locking 403 and driving circuit 404.
The transmitting terminal 10, the wireless electric energy transmission device 20 and the receiving terminal 30 are sequentially connected；The frequency
Follow-up control apparatus 40 is separately connected transmitting terminal 10 and the wireless electric energy transmission device 20.
Specifically as shown in Fig. 2, the output end both ends of the high-frequency resonant inverter are separately connected the driving circuit 404
The output end of the input terminal of output end and the LC resonance termination power 20, the LC resonance termination power 20 connects the reception
End 30；The input terminal of the high-frequency current detection circuit 401 meets at the high-frequency resonant inverter and is coupled with the LC resonance altogether
Between circuit 20.
Transmitting terminal 10 exports certain voltage and electric current to receiving terminal 30, and by wireless electric energy transmission device by transmitting terminal 10
The electric energy of high-frequency inversion is transmitted to receiving terminal 30, and the frequency tracing control device 40 is according to the LC resonance termination power detected
20 inductance value variation, automatically adjust transmitting terminal output voltage, control the tranmitting frequency of transmitting terminal so that the tranmitting frequency with
The resonant frequency variation for LC resonance termination power 20, improves wireless power transmission efficiency.
Fig. 3 is please referred to, Fig. 3 is the LC resonance termination power figure in the wireless charging system of the present invention.As shown in figure 3, institute
It includes the first resonant inductance circuit 201 and the second resonant inductance circuit 202 to state LC resonance termination power 20.The first resonance electricity
Inductive circuit 201 includes first resistor R1, the first capacitance C1 and the first inductance coil L1, the second resonant inductance circuit 202
It is with the second capacitance C2 including second resistance R2, the second capacitance C2 and the second inductance coil L2, the first capacitance C1
Series resonant capacitance so that the first inductance coil L1 forms series capacitance resonance with the second inductance coil L2 and couples,
RL is load resistance, and Vi is sources of high frequency emissions, the sources of high frequency emissions, first resistor R1, the electricity of the first inductance coil L1 and first
Hold C1 and form launching circuit, generated first electric current is i1, the second resistance R2, the second inductance coil L2, the second capacitance
C2 and load resistance RL, which is formed, receives circuit, and generated second electric current is i2.
In order to enable radio energy is maximized absorption, to improve wireless power transmission efficiency, wireless charging is analyzed in advance
The efficiency of transmission of system is related with which environmental factor and it influences relationship, specific as follows：
By taking LC resonance termination power in Fig. 3 as an example, using direct current as power supply output voltage and electric current, voltage is obtained
With the relational expression of electric current, as shown in formula (1)：
L1 is the inductance value that the first inductance coil L1 is generated in formula (1), and L2 is the inductance value that the second inductance coil L2 is generated,
Mutual induction amounts of the M between two inductance coils, D are the transmission range of launching circuit and reception circuit, and I1 is the electric current of launching circuit
Value, I2 are the current value for receiving circuit, and R1 is first resistor resistance value, and R2 is second resistance resistance value, and C1 is the capacitance of the first capacitance
Amount, C2 are the capacitance of the second capacitance, and Vi is voltage value, and j is imaginary unit, indicate the imaginary part of capacitive reactance or induction reactance, ω is angular frequency
Rate or angular speed.
Then setting launching circuit impedance be Z1, receive circuit impedance be Z2, by formula (2) be calculated Z1 and
Z2：
Formula (2) is substituted into formula (1) and obtains the electric current of launching circuit and reception circuit, such as formula (3)
According to power in electricity and voltage relationship, calculates the input power Pin of launching circuit and receive load electricity in circuit
The output power Pout for hindering RL, such as formula (4) and (5)：
According to input power Pin and output power Pout, efficiency of transmission is calculated, such as formula (6)
The mutual induction amount in two inductance coils is calculated, such as formula (7)
Formula (2) and formula (7) are substituted into formula (6), then formula (6) deformation obtains formula (8)：
When launching circuit is with circuit generation resonance is received, there are z1=r1, z2=r2+r1, then formula (6) or formula (8) deformation
Obtain formula (9)：
By formula (8) it is found that the factors such as the efficiency of transmission of wireless charging system and inductance distance, angular speed, resistance are related.When
When related resonant parameter determines in LC resonance termination power, resonant capacitance determines, and ω, R1, R2 change with resonant inductance
And change.And during the work time, in addition to manufacturing deviation leads to resonant inductance deviation theory calculated value, the environment around coil,
The variation of parasitic parameter and circuit Wen Sheng can all cause winding inductance quantity to change in circuit.Therefore, the present invention is analyzed by designing
Winding inductance quantity changes the specific influence on efficiency of transmission.
Specifically, it is 1mhz, L1=2.35mh, C1=12nf, L2=that resonant frequency in LC resonance termination power, which is arranged,
25mh, C2=1.0nf.Therefore, under high frequency condition, coil dead resistance includes mainly radiation loss resistance Rr and coil loss
Resistance Ro, calculation formula such as formula (10) and formula (11)：
μ 0 is space permeability in formula (10) and formula (11)；R is coil radius；N is coil turn；A is wire radius；σ
For conductivity；L is conductor length；ε 0 is dielectric constant of air；H is coil width；C is the light velocity.
The relational expression that the transmission range and mutual inductance of wireless charging system are obtained by above-mentioned formula, as shown in formula (12)：
By formula (11) it is found that in LC resonance termination power mutual inductance be inversely proportional with apart from cube, i.e., distance it is remoter, coupling is got over
Small, efficiency of transmission is lower, conversely, distance is closer, coupling is bigger, and efficiency of transmission is higher.Pass through a certain distance, it is ensured that transmitting terminal
A voltage is exported, the voltage is not less than minimum voltage so that the voltage that receiving terminal can receive after processing is just used on
Charging.The minimum voltage is 0.018mV.
For the ease of analyzing the relationship of inductance value and efficiency of transmission, defining resonant frequency range in LC resonance termination power is
1~50Mhz, in the resonant frequency range, radiation loss resistance Rr is far smaller than coil loss resistance Ro, therefore negligible
Radiation loss, coil dead resistance is mainly coil loss resistance at this time.
To reduce the parasitic parameter of resonant inductor to the greatest extent, the present invention designs launching circuit and receives first electricity in circuit
Sense coil L1 and the corresponding dimensional parameters of the second inductance coil L2 are respectively：A1=0.725mm, a2=0.362mm；N1=2, n2
=10；R1=r2=5cm, the dead resistance that two inductance coils can be then calculated according to (10) formula are respectively R1=0.014 ω,
R2=0.139 ω.Then coefficient of coup k=0.02 and load RL=10 ω is set so that resonance is coupled as weak coupling, will couple
Coefficient k=0.02 and load RL=10 ω substitute into (8) respectively, and (9) two formulas obtain each influence factor, such as the first inductance coil L1
The graph of relation of (transmitting coil), the second inductance coil L2 (receiving coil), transmission range d and frequency f and efficiency of transmission.
Wherein, Fig. 4 illustrates the graph of relation of the first inductance coil L1 and efficiency of transmission μ (L1), efficiency of transmission μ (L1)
First increase with the increase of the first inductance coil L1, when arriving peaking, reduces with the increase of the first inductance coil L1；Fig. 5 shows
The example graph of relation of the second inductance coil L2 and efficiency of transmission μ (L2), efficiency of transmission μ (L2) is with the second inductance coil L2
Increase and remain unchanged；Fig. 6 illustrates the graph of relation of resonant frequency f and efficiency of transmission μ (f), efficiency of transmission μ (f) with
The increase of resonant frequency f and increase, when resonant frequency f increases to certain value, efficiency of transmission μ (f) will be remained unchanged；Fig. 7 shows
The example graph of relation of transmission range d and efficiency of transmission μ (d), wherein set resonant frequency as 1mhz, efficiency of transmission μ (d) with
It transmission range d and greatly reduces.
Therefore, by Fig. 4 and Fig. 5 it is found that when transmitting coil inductance value deviates theoretical value ± 0.05mh, i.e., ± 2% theory
When value, efficiency of transmission has dropped 30% or more；And when receiving coil inductance value deviates theoretical value same ratio, efficiency change is but
Less.By Fig. 6 and Fig. 7 it is found that efficiency of transmission is gradually increased with the rising of resonant frequency, it is reduced rapidly with the increase of distance, but
If transmission range and resonant frequency once it is determined that, corresponding efficiency of transmission determines.
It is analyzed based on Fig. 4-Fig. 7, inductance value variation is the main reason for causing efficiency of transmission to decline in resonant coupling circuit
One of.Therefore, the present invention passes through detecting come the tranmitting frequency of adjust automatically transmitting terminal to inductance value so that transmitting terminal is located always
In resonant condition, i.e. tranmitting frequency follows the resonant frequency of LC resonance termination power to change, to improve efficiency of transmission, avoids losing
It is humorous.
Referring to Fig. 8, Fig. 8 is the high-frequency current detection circuit figure of wireless charging system of the present invention, as shown in figure 8, high frequency
Current detection circuit 401 include current transformer 4011, measured resistance R, 3rd resistor R3, the 4th resistance R4, the 5th resistance R5,
6th resistance R6 and differential transport and placing device 4012；Altogether, the other end intersects with the 4th resistance R4 for one end of the 5th resistance R5
It is connected to the anode of 4012 input terminal of differential transport and placing device；The 3rd resistor R3 intersects with the 6th resistance R6 to be connected to
The cathode of 4012 input terminal of differential transport and placing device；The 3rd resistor R3 is in parallel with the 4th resistance R4, with measured resistance R
Series connection.
Wherein, the current transformer 4011 is magnetic core coiling current transformer, for by detecting electricity in launching circuit
Flow valuve, perceives the variation of transmitting coil inductance value (M) in LC resonance termination power 20, i.e. the variation of inductance value causes launching circuit
Current value size variation；The differential transport and placing device 4012 is used to the voltage that transmitting terminal exports being amplified boosting, so as to full
Needed for corresponding 30 charging voltage of receiving terminal (terminal) of foot.
In embodiments of the present invention, 3rd resistor R3 is identical as the resistance value of the 4th resistance R4, the electricity of the 5th resistance R5 and the 6th
The resistance value for hindering R6 is identical, is used to that measured resistance R is protected not to be damaged.Certainly, it is also possible to which other components replace, as long as meeting
Corresponding element device resistance value is identical, plays the role of overprotection, such as the third LED light and the 4th LED light of similar resistance,
5th LED light of similar resistance and the 6th LED light.
Specifically, high-frequency current detection uses difference current detection method, and institute is detected by the current transformer 4011
The electric current at the both ends measured resistance R is stated, high-frequency electrical flow valuve is obtained, concurrently send current signal to signal processing center to be handled, institute
State signal processing center by the current signal be converted into voltage signal output, this voltage signal be differential voltage Vd, then to
The anode output of 4012 input terminal of differential transport and placing device, amplifies voltage Vp, such as Fig. 8 through 4012 output end output difference of differential transport and placing device
At the A of midpoint.Either differential voltage Vd or differential amplified voltage Vp is in cyclically-varying with current fluctuation.
Fig. 9 and Figure 10 are please referred to, Fig. 9 is the phase voltage compensation circuit figure of wireless charging system of the present invention, and Figure 10 is this
Phase voltage compensation circuit voltage oscillogram in the wireless charging system of invention, as shown in figure 9, phase voltage compensation circuit 402
Including the first diode D1, the 7th resistance R7, the 8th resistance R8, adjustable resistance Rp, the 6th capacitance C6 and comparator；Described
Six capacitances are parallel to the 7th resistance R7 and adjustable resistance Rp；Described one end first diode D1 connects the differential transport and placing device
Output end, the other end connect the 7th resistance R7；The 7th resistance R7 connects with the first diode D1 and the 8th resistance R8,
It is in parallel with the adjustable resistance Rp, and meet at the anode of the comparator；The cathode of the comparator connects the 8th resistance
R8。
In Fig. 9, Vp be high-frequency current detection circuit output differential amplified voltage, vref be by differential amplified voltage Vp into
The DC reference voltage that row rectification is handled, for being referred to the phase compensation of differential voltage Vd.Just because of either differential
Voltage Vd or differential amplified voltage Vp is in cyclically-varying with current fluctuation, to ensure the phase compensation of comparator output
Voltage Vc is not fluctuated with the fluctuation of the electric current of frequency detection circuit detection, and intelligence adjusts adjustable resistance Rp to be made as shown in Figure 10
Vref is obtained with the directly proportional variation of the electric current.
Specifically, as shown in Figure 10, differential voltage Vd is changed over time moves in periodic amplitude, the DC reference electricity
Pressure vref is a fixed value, and positive and negative anodes of the DC reference voltage vref and differential voltage Vd through comparator input, will be described
Differential voltage Vd is compared with vref, and when any δ t times, the differential voltage Vd is respectively less than the DC reference voltage
When vref, a phase compensation voltage Vc is exported, to realize phase compensation so that high-frequency resonant inverter is operated in capacitive shape
State, to realize the maximization of efficiency of transmission.
Certainly, if any δ t times, when the differential voltage Vd is all higher than the DC reference voltage vref, then phase is mended
Voltage Vc=0 is repaid, namely without phase voltage compensating operation.
The phaselocked loop control circuit of phase locking figure that 1, Figure 11 is wireless charging system of the present invention is please referred to Fig.1, is for the present invention
Core, as shown in figure 11, the phaselocked loop control circuit of phase locking 403 include the phase-locked loop chip with voltage controlled oscillator
4032, eleventh resistor R11, twelfth resistor R12 and third capacitance C3；14th pin of the phase-locked loop chip connects institute
Comparator is stated, the 11st pin connects the eleventh resistor R11, and the 12nd pin connects the twelfth resistor R12, the 4th pin
It connects the 404, the 6th pin of the driving circuit and the 7th pin is connected to the both ends of the third capacitance C3；The phaselocked loop
The power end connection power supply VCC of chip 4032；The eleventh resistor R11 is in parallel with twelfth resistor R12, and ground connection altogether
GND。
Preferably, the resistance value of eleventh resistor R11 and twelfth resistor R12 are 10k, and the capacitance of third capacitance C3 is
1nF。
The phaselocked loop control circuit of phase locking 403 further includes self-start circuit 4031, for existing when high-frequency resonant inverter
In start-up course, electric current is established at once so that the driving of the switching tube in high-frequency resonant inverter can be also immediately generated, and be this hair
Bright improvements.The self-start circuit 4031 includes thirteenth resistor R13, the 14th resistance R14, the 5th capacitance C5 and the
Two diode D2, the one end the thirteenth resistor R13 are connected in series in ground, other end connection power supply with the 14th resistance R14
The both ends of power supply VCC, the 5th capacitance C5 are connected to the thirteenth resistor R13, described in the second diode D2 connections
9th pin of phase-locked loop chip 4032.
Preferably, the resistance value of thirteenth resistor R13 is 100K, and the 14th resistance R14 is 660K, the electricity of the 5th capacitance C5
Capacitance is 100nF, and the voltage value of power supply VCC is 5V.
The phaselocked loop control circuit of phase locking 403 further includes protection circuit 4034, for the electric current or electricity in control circuit
Pressure avoids the voltage for flowing through circuit or electric current is excessive leads to equipment damage.The protection circuit 4034 includes the 15th resistance
R15, the 16th resistance R16, the tenth resistance R10, the 9th resistance R9 and the 4th capacitance C4.The one end the 15th resistance R15
Connect power supply VCC, the output end VCOout of other end connection the 4th pin of phase-locked loop chip, the one of the 9th resistance R9
End connection the 13rd pin of phase-locked loop chip, the other end is connected in series with the tenth resistance R10, the 4th capacitance C4, with the second diode
D2 is in parallel；The other end of the 4th capacitance C4 connects phase-locked loop chip GND pin, and is grounded.
Preferably, the resistance value of the 15th resistance R15 is 2k, and the resistance value of the 16th resistance R16 is 200Kk, the tenth electricity
The resistance value for hindering R10 is 47k, the resistance value of the 9th resistance R9 is 470k, and the capacitance of the 4th capacitance C4 is 100nF.
In the embodiment of the present invention, the model 74HC4046 of the phase-locked loop chip comprising three phase discriminators, respectively
First phase discriminator PC1, the second phase discriminator PC2 and third phase discriminator PC3, passive filter and voltage controlled oscillator VCO.It is described
The working frequency of phase-locked loop chip is 1mhz.
Specifically, the eleventh resistor R11 and third capacitance C3 that the centre frequency of voltage controlled oscillator VCO is connect by the 11st foot
It determines, and the connect twelfth resistor R12 of the 12nd foot is used for determining the deviation frequency of phase-locked loop chip 4032, works as twelfth resistor
When the resistance of R12 reduces, the deviation frequency of phase-locked loop chip 4032 increases so that phase locked track range becomes larger.
After phase-locked loop chip 4032 starts power supply VCC, the 5th capacitance C5 instantaneous short circuits, phase-locked loop chip 4032
The voltage of 9th pin vcoin is begun to decline from maximum value, at this time the corresponding output end of the 4th pin of phase-locked loop chip 4032
The pulse of vcoout is begun to decline from maximum tracking frequency fmax to minimum tracking frequency fmin, and when in lc resonant coupling circuits
Resonant frequency between fmax~fmin, phaselocked loop automatically enter lock.
I.e. specifically, when the following range of locking phase be 0.99mhz~1.1mhz when namely LC resonance termination power 20 it is humorous
Vibration frequency ranging from 0.99mhz~1.1mhz, phase-locked loop chip 4032 export a pulse voltage VCOout and its input pulse vc
(phase compensation voltage) is compared into the second phase discriminator pc2, and when the two is there are when phase difference, the second phase discriminator pc2 is exported
One voltage signal, and the input of the 9th foot is controlled with this voltage, for changing the frequency of oscillation of voltage controlled oscillator VCO, make voltage-controlled shake
The pulse voltage vcoout for swinging device VCO is consistent with phase compensation voltage-phase, as shown in figs. 12-15, realizes genlock ring core
The input and output of piece 4032 enter lock, realize frequency-tracking.Wherein, Figure 12 is illustrated in resonant frequency f=0.993mhz
When, the variation oscillogram of VCOout and vc t at any time, Figure 13 are illustrated in resonant frequency f=1.001mhz, VCOout and vc
The variation oscillogram of t at any time, Figure 14 are illustrated in resonant frequency f=1.047mhz, the variation of VCOout and vc t at any time
Oscillogram, Figure 15 are illustrated in resonant frequency f=1.103mhz, the variation oscillogram of VCOout and vc t at any time.
Further, when phase-locked loop chip 4032 export pulse voltage vcoout be input to the driving circuit, it is described
Driving circuit controls the break-make of high-frequency resonant inverter switching device pipe, adjust automatically transmitting terminal according to the pulse voltage vcoout of input
Tranmitting frequency so that tranmitting frequency synchronize LC resonance coupling resonant frequency variation, improve efficiency of transmission.
Wherein, the driving circuit includes pwm driver, and the input terminal of the PVM drivers connects phase-locked loop chip
4032 the 4th pins, output end connect high-frequency resonant inverter.
Embodiment two
To verify and realizing that efficiency of transmission maximizes, the present invention selects the two-tube resonance inverter of high frequency e classes, output power
For 30w；Pwm driver uses ucc27325 high speed integrated drive chips；LC resonance termination power 20 selects high speed photo coupling
6n137, and 1mhz frequency LC resonances couple；Receiving terminal uses the light bulb of 25w/110v as load；Differential transport and placing device 4012 uses
High speed amplifier lm318；Comparator uses high-speed comparator lm311, and experiment obtains the oscillogram of vd, vp, vc three, such as Figure 16 institutes
Show, as shown in Figure 16, vd, vp, vc three's voltage keep direct ratio to change at any time.
Based on above-mentioned component, and current value is 30v/1.0A, the feelings that transmission range d is 3cm in LC resonance termination power
Under condition, Figure 17 illustrates the corresponding load voltage waveform of wireless charging system of frequency-tracking, and as shown in figure 18, output is born
Load voltage waveform is sine wave, virtual value 106.8v, and the wireless charging system that Figure 18 illustrates no frequency-tracking is corresponding
Load voltage waveform, as shown in figure 18, the load voltage waveform of output slightly distort, and its virtual value is 68.7v.Pass through Figure 17
It is compared with both Figure 18, it is clear that output voltage loss is small when frequency-tracking, and power delivery capabilities are strong, quality is high, and efficiency of transmission is high.
The present invention has frequency-tracking and no frequency-tracking by further changing transmission range d to observe under certain distance
Efficiency of transmission relationship is illustrated as shown in figure 19, in figure when transmission range d is respectively 3cm, 5cm, 10cm, 15cm and 20cm
The efficiency of transmission percentage for having frequency-tracking with no frequency-tracking measured, it appears from figure 19 that there is the efficiency of transmission of frequency-tracking
It is above the efficiency of transmission of no frequency-tracking under different distance, and increases with distance, efficiency of transmission declines rapidly, that is,
It says, the cube of two winding inductance quantities and transmission range is inversely in wireless electric energy transmission device.
Embodiment three
The present invention also provides a kind of resonance compensation shunt method of wireless charging system, Figure 20 is a kind of wireless charging system
Resonance compensation shunt method flow chart, as shown in figure 20, resonance compensation shunting includes the following steps, for realizing nothing
Micro USB electric system：
S10 starts DC power supply, the electric current of launching circuit is detected in real time, to detect whether inductance value changes.
In the embodiment of the present invention, the frequency-tracking ranging from 0.99mhz-1.1mhz of phaselocked loop is pre-set, for ensureing
Phaselocked loop input is synchronous with output；Default setting resonance coupling frequency is 1mhz.
Start DC power supply in wireless charging system, starts the terminal connected into certain distance and carry out wireless charging, it is defeated
Go out corresponding electric current and voltage.Wherein, the certain distance refers to terminal at a distance from transmitting terminal, is 0 to 10 apart from section
Rice.
In the embodiment of the present invention, the connection type be radio connection, wireless charging system by phase control techniques with
And frequency range is identified as different terminals and exports corresponding different voltage and current, can charge normal, while being damaged to avoid terminal
It is bad.Wherein, the minimum 0.18mv of voltage value of transmitting terminal output.The frequency range is 1.2GHZ-5.8GHZ.
Further, until 8 terminals of multi-connection carry out wireless charging, it just can guarantee the efficiency of transmission value of wireless charging system
Not less than 96% namely radio energy utilization rate is not less than 96%.
After wireless charging system starts, whether the inductance value for detecting launching circuit in real time changes, and is based on above-described embodiment
One and embodiment two it is found that when distance change of the terminal from transmitting terminal, the variation of inductance value can be caused, and then cause to be transmitted back to
Curent change in road.For example, when terminal is increasingly closer to transmitting terminal, inductance value increases, and spacer medium penetration power is reinforced or is situated between
Matter object is reduced, and then increases transmitting terminal charge function so that radio energy maximization is absorbed.
S20 obtains the electric current of launching circuit when detecting that the inductance value changes, and is converted to signal voltage
Output.
Based on step S10, the detection of inductance value is converted into current detecting in radiating circuit, using current transformer to tested
The current sample at resistance both ends, and be difference current detection.When detecting that the inductance value changes, i.e. curent change
When, the real-time current value that current transformer detects is obtained, and the electric current is subjected to information of voltage through signal processing center and is turned
It changes, a signal voltage Vd is exported to differential transport and placing device.
The signal voltage is obtained differential amplified voltage by S30 after the amplification of differential transport and placing device.
In order to meet the charging voltage demand of different terminals, and transmit in power process because spacer medium or distance make
The transmission of frequency range voltage constantly reduces, and needs the voltage exported to transmitting terminal to be amplified boosting, therefore, will be obtained in step S20
Signal voltage Vd through specific differential transport and placing device differential amplification processing, export a differential amplified voltage Vp.
Differential amplification processing refer to voltage needed for the corresponding frequency range of terminal according to connection and with transmitting terminal away from
From the signal voltage Vd of intelligence amplification transmitting terminal output makes it meet needed for load terminal charging.
S40, by the differential amplified voltage compared with predeterminated voltage, according to comparison result, through phase voltage compensation circuit
Carry out phase compensation, output phase offset voltage.
In wireless charging system, when transmitting terminal and the distance change of the terminal of reception so that transmitting antenna and reception day
Coupled system changes between line, since the interference of reflected umpedance makes resonant frequency change, causes inductance value to change so that resonance
Voltage delay directly has phase difference generation in one phase angle of resonance current, i.e. electric current with voltage, needs to carry out it at this time
Phase voltage compensates.
Specifically, the differential amplified voltage Vp, according to comparison result, is compensated compared with predeterminated voltage through phase voltage
Circuit carries out phase compensation, output phase offset voltage Vc.The predeterminated voltage is after the differential amplified voltage Vp is rectified
An obtained DC reference voltage vref is used as phase voltage and compensates reference data.
When differential amplified voltage Vp is more than DC reference voltage vref, without phase voltage compensation deals, i.e. Vc=
0；When differential amplified voltage Vp be less than DC reference voltage vref, carry out phase voltage compensation deals, according to compare difference by than
Compared with device output phase offset voltage Vc.It should be noted that DC reference voltage vref also can be by adjustable resistance Rp according to need
It is adjusted.The phase compensation voltage Vc is in cyclically-varying.
S50, phase-locked loop chip is according to the phase compensation voltage of output, the output voltage of adjust automatically transmitting terminal, so as to pass
Defeated efficiency reaches desired value.
Based on step S40, the phase compensation voltage Vc is exported to phase-locked loop chip, and phase-locked loop chip receives the phase
After offset voltage Vc, certain voltage is inputted by pin control, changes the frequency of oscillation of voltage controlled oscillator, changes locking phase ring core
The output voltage VCOout values of piece make VCOout=Vc, that is, export a pulse electricity identical with phase compensation voltage Vc frequencies
It is depressed into the pwm driver of driving circuit 404, the pwm driver controls high-frequency resonant inverter according to the pulse voltage
The break-make of switching tube, the output voltage values of adjust automatically transmitting terminal, so that efficiency of transmission reaches desired value, the desired value is electricity
Energy efficiency of transmission is not less than 96%.
In this way, by step S10-S50, the phase compensation of wireless charging system is not only realized, is also achieved according to not
Same terminal-pair resonance voltage is shunted so that each terminal can receive largest portion electric energy, while by adjusting hair
The tranmitting frequency for penetrating end ensures that transmitting terminal always works in resonant condition, improves wireless power transmission efficiency, easy to operate.
It should be noted that the model of exemplary component is specific as described in embodiment two in embodiment three, so not existing
It repeats.
In conclusion the invention discloses a kind of wireless charging system and its resonance compensation shunt method, the wireless charging
Electric system includes transmitting terminal 10, wireless electric energy transmission device 20, receiving terminal 30 and frequency tracing control device 40；The transmitting
End 40 includes the DC power supply for power supply and the high-frequency resonant inverter that is connect with DC power supply both ends；The radio energy passes
Defeated device 20 includes the LC resonance termination power 20 for transmitting electric energy；The receiving terminal 30 includes at least one for receiving nothing
The terminal of line electric energy；The frequency tracing control device 40 includes the high-frequency current detection circuit 401 being sequentially connected in series, phase voltage
Compensation circuit 402, phaselocked loop control circuit of phase locking 403 and driving circuit 404.The present invention detects hair by current transformer
When being emitted back towards the inductance value on road and changing, frequency tracking apparatus is mended according to the phase difference of electric current and voltage in driving circuit
It repays, controls the output voltage of driving circuit adjust automatically transmitting terminal, improve the efficiency of transmission of wireless charging system.
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 be completed by computer program to instruct related hardware (such as processor, controller etc.), 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 wireless charging system, which is characterized in that including：
Transmitting terminal, wireless electric energy transmission device, receiving terminal and frequency tracing control device；
The transmitting terminal includes the DC power supply for power supply and the high-frequency resonant inverter that is connect with DC power supply both ends；
The wireless electric energy transmission device includes the LC resonance termination power for transmitting electric energy；
The receiving terminal includes at least one terminal for receiving radio energy；
The frequency tracing control device includes the high-frequency current detection circuit, phase voltage compensation circuit, locking phase being sequentially connected in series
Ring control circuit of phase locking and driving circuit；
The transmitting terminal, the wireless electric energy transmission device and the receiving terminal are sequentially connected；The frequency tracing control dress
It sets and is separately connected transmitting terminal and the wireless electric energy transmission device；
When high-frequency current detection circuit detects that the inductance value of launching circuit generates variation, frequency tracking apparatus is according to electric current and electricity
The phase difference of pressure compensates, the output voltage of adjust automatically transmitting terminal, so that efficiency of transmission reaches desired value.
2. wireless charging system according to claim 1, which is characterized in that the LC resonance termination power includes first humorous
Shake inductive circuit and the second resonant inductance circuit, and the first resonant inductance circuit includes first resistor, the first capacitance and
One inductance coil, the second resonant inductance circuit include second resistance, the second capacitance and the second inductance coil, and described first
Inductance coil and second inductance coil form inductance resonance and couples, the DC power supply, the high-frequency resonant inverter and
The first resonant inductance circuit is in turn connected to form launching circuit, and the second resonant inductance circuit and the receiving terminal are successively
Connection, which is formed, receives circuit.
3. wireless charging system according to claim 1, which is characterized in that the high-frequency current detection circuit includes electric current
Mutual inductor, measured resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance and differential transport and placing device；5th electricity
Altogether, the other end intersects the anode for being connected to the differential transport and placing device input terminal with the 4th resistance for one end of resistance；The third electricity
The cathode for being connected to the differential transport and placing device input terminal is intersected in resistance with the 6th resistance；The 3rd resistor and the 4th electricity
Resistance is in parallel, connects with measured resistance.
4. wireless charging system according to claim 3, which is characterized in that the phase voltage compensation circuit includes first
Diode, the 7th resistance, the 8th resistance, adjustable resistance and comparator；First diode one end connects the differential fortune
The output end of device is put, the other end connects the 7th resistance；7th resistance is connected with first diode and the 8th resistance, with
The adjustable resistance is in parallel, and meets at the anode of the comparator；The cathode of the comparator connects the 8th resistance.
5. wireless charging system according to claim 4, which is characterized in that the phaselocked loop control circuit of phase locking includes band
Phase-locked loop chip, eleventh resistor, twelfth resistor and the third capacitance of voltage controlled oscillator；The 14th of the phase-locked loop chip
The pin connection comparator, the 11st pin connection eleventh resistor, the 12nd pin connection twelfth resistor, the 4th
Pin connects the driving circuit, and the 6th pin and the 7th pin are connected to the both ends of the third capacitance；The phaselocked loop
The power end of chip connects power supply；The eleventh resistor is in parallel with twelfth resistor, and ground connection altogether.
6. wireless charging system according to claim 5, which is characterized in that the phaselocked loop control circuit of phase locking further includes
Self-start circuit, the self-start circuit include thirteenth resistor, the 14th resistance, the 5th capacitance and the second diode, institute
It states thirteenth resistor one end and is connected in series in ground with the 14th resistance, the other end connects power supply, the 5th capacitance
Both ends are connected to the thirteenth resistor, and second diode connects the 9th pin of the phase-locked loop chip.
7. wireless charging system according to claim 5, which is characterized in that the phase-locked loop chip is 74HC404 locking phases
Ring core piece, including the first phase discriminator, the second phase discriminator, third phase discriminator, passive filter and voltage controlled oscillator.
8. wireless charging system according to claim 1, which is characterized in that the high-frequency resonant inverter is high frequency E class
Two-tube inductance capacitance resonance inverter；The driving circuit includes pwm driver；The desired value is that electric energy efficiency of transmission is not low
In 96%.
9. the resonance compensation shunt method of a kind of wireless charging system, for realizing wireless charging according to claims 1-8
System, which is characterized in that the resonance compensation shunt method of the wireless charging system includes the following steps：
Start DC power supply, the electric current of launching circuit is detected in real time, to detect whether inductance value changes；
When detecting that the inductance value changes, the electric current of launching circuit is obtained, and is converted to signal voltage output；
The signal voltage is obtained into differential amplified voltage after the amplification of differential transport and placing device；
By the differential amplified voltage compared with predeterminated voltage, according to comparison result, phase is carried out through phase voltage compensation circuit
Compensation, output phase offset voltage；
Phase-locked loop chip is according to the phase compensation voltage of output, the output voltage of adjust automatically transmitting terminal, so that efficiency of transmission reaches
To desired value.
10. the resonance compensation shunt method of wireless charging system according to claim 9, which is characterized in that described default
Voltage is the DC reference voltage obtained after the differential amplified voltage is rectified；The desired value be electric energy efficiency of transmission not
Less than 96%.
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| CN109474082A (en) * | 2018-12-07 | 2019-03-15 | 华中科技大学 | A bidirectional wireless power transmission system and method based on variable compensation network structure |
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| CN113433391A (en) * | 2021-06-18 | 2021-09-24 | 哈尔滨工业大学（深圳） | Circuit, method, system and storage medium for realizing remote voltage accurate control |
| CN113555973A (en) * | 2021-07-27 | 2021-10-26 | 黄石邦柯科技股份有限公司 | Manufacturing method of optimal frequency wireless energy transfer device |
| CN115224822A (en) * | 2022-06-30 | 2022-10-21 | 武汉海王科技有限公司 | A frequency tracking method, device and storage device for a magnetic resonance system |
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| CN109474082A (en) * | 2018-12-07 | 2019-03-15 | 华中科技大学 | A bidirectional wireless power transmission system and method based on variable compensation network structure |
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| CN112751397A (en) * | 2020-12-29 | 2021-05-04 | 东北林业大学 | Strong anti-offset wireless charging system for cooperative power supply of desktop display and smart phone |
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| CN115224822A (en) * | 2022-06-30 | 2022-10-21 | 武汉海王科技有限公司 | A frequency tracking method, device and storage device for a magnetic resonance system |
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Application publication date: 20181113 |
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