CN207835173U - A kind of intrinsic angular frequency control magnetic resonance SS type radio energy transmission systems - Google Patents
A kind of intrinsic angular frequency control magnetic resonance SS type radio energy transmission systems Download PDFInfo
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- CN207835173U CN207835173U CN201820180997.7U CN201820180997U CN207835173U CN 207835173 U CN207835173 U CN 207835173U CN 201820180997 U CN201820180997 U CN 201820180997U CN 207835173 U CN207835173 U CN 207835173U
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- primary side
- angular frequency
- tunable capacitor
- resonator
- side resonator
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Abstract
The utility model discloses a kind of intrinsic angular frequencies to control magnetic resonance SS type radio energy transmission systems, including constant frequency AC power US, primary side resonator, secondary side resonator and load；Primary side resonator includes the primary side transmitting coil being connected in series with and primary side tunable capacitor, and there is primary side inductance coil primary coil internal resistance, the capacitance of primary side capacitance can be adjusted by control；It is secondary while resonator include be connected in series with it is secondary while receiving coil and secondary side tunable capacitor, secondary inductance coil there is secondary coil internal resistance, the capacitance of secondary side tunable capacitor can be adjusted by control.The utility model utilizes constant frequency AC power USSystem is powered, the capacitance of the tunable capacitor by adjusting former and deputy side resonator controls the intrinsic angular frequency of system, it is made to track the work angular frequency of AC power, realizes stable, efficient wireless power transmission.
Description
Technical field
The utility model is related to the technical fields of wireless power transmission, refer in particular to a kind of intrinsic angular frequency control magnetic resonance
SS type radio energy transmission systems.
Background technology
Wireless power transmission technology may be implemented to be electrically isolated completely between power supply and electrical equipment, have safety, can
It leans on, flexible advantage.Early at the end of the 19th century, Ni Gula teslas (Nikola Tesla) utilize wireless power transmission principle,
A light bulb has been lighted in the case of no any conducting wire connection.Wireless power transmission based on magnet coupled resonant type is MIT
The breakthrough that is obtained in wireless power transmission field of scholar, in wireless power transmission since being disclosed and delivering within 2007
Field causes very big repercussion, and more and more scholars are added to the basic research of wireless power transmission technology and application is opened
Hair.
Current radio energy transmission system can be divided into two classes according to the power of coupling.The power of system coupling is by transmitting
Distance determines.When the distance between primary side resonator and secondary side resonator is closer, system will enter close coupling state；Otherwise will
In weak-coupling state.Under weak coupling operating condition, the output power of system is intrinsic equal to former and deputy side in system operating frequency
Maximum value is obtained at frequency.And under close coupling operating condition, system will appear the distinctive frequency of radio energy transmission system point
Phenomenon is split, i.e. the output power peak value of system splits into two points, is located at the both sides of former and deputy side intrinsic frequency.Frequency point
The essence the split i.e. eigenfrequency of system becomes two different real roots from two Conjugate complex roots.In order to ensure the output work of system
Rate, many solutions are suggested.There are mainly three types of types for current existing solution：MPPT, tracking original edge voltage, electric current
Phase zero points track original edge voltage and secondary current phase zero points.And three of the above type be all to the working frequency of system into
Row changes.However in many practical applications, the working frequency of system is needed to meet relevant criterion.Working frequency is limited in
In certain frequency band.Therefore the applicability of frequency control is relatively low.
Utility model content
The purpose of the utility model is to overcome the deficiencies in the prior art, it is proposed that a kind of sheet realized based on tunable capacitor
It levies angular frequency and controls magnetic resonance SS type radio energy transmission systems, be the sheet by the tunable capacitor of control system bilateral to system
Sign angular frequency is adjusted so that intrinsic angular frequency tracks constant power supply angular frequency, which can solve the adaptation of frequency
Sex chromosome mosaicism, while the efficiency of transmission of the system and output power remain unchanged under close coupling working condition realizes permanent steady
Wireless power transmission.
To achieve the above object, technical solution provided by the utility model is：A kind of intrinsic angular frequency control magnetic resonance
SS type radio energy transmission systems, the system is by constant frequency AC power US, primary side resonator, secondary side resonator and load
Composition；
The constant frequency AC power USIt is connected with primary side resonator, working frequency fSAnd work angular frequencys=2 π
fSIt remains unchanged；
The primary side resonator is by primary side tunable capacitor Cs1With primary side inductance coil L1It is connected in series, the primary side inductor wire
Enclose L1With primary coil internal resistance RS1, the primary side resonator is with natural resonance angular frequencyWith primary side internal resistance
Loss factor γ1=RS1/2L1；
It is described it is secondary while resonator by it is secondary while tunable capacitor Cs2With secondary inductance coil L2It is connected in series, the secondary inductance line
Enclose L2With secondary coil internal resistance RS2, the pair side resonator is with natural resonance angular frequencyWith secondary side internal resistance
Loss factor γ2=RS2/2L2；
The load RLIt is connected with secondary side resonator, corresponds to load loss coefficient gammaL=RL/2L2；
The primary side resonator and secondary side resonator are intercoupled by magnetic field, and the intensity of coupling is by mutual inductance M or coupled systemes
NumberCharacterization；
The capacitance of the primary side tunable capacitor and secondary side tunable capacitor is controlled by external signal, humorous to adjust primary side
Shake the natural angular frequency ω of device1With the natural angular frequency ω of secondary side resonator2, make the intrinsic angular frequency of the systemeWith it is constant
The work angular frequency of frequency AC sourcesKeep identical.
The intrinsic angular frequency of the systemeBy primary side internal resistance loss factor, secondary side internal resistance loss factor, load loss system
The natural angular frequency determination of number, the coefficient of coup, the natural angular frequency of primary side resonator and secondary side resonator；The exchange of the system
When power supply angular frequency is identical as intrinsic angular frequency, the AC power fundamental voltage output of voltage virtual value U of the systemSAnd AC power
Output current fundamental wave virtual value ISMeet relationship：The electric power output voltage fundamental phasors of the systemMeet relationship with the phase difference of AC power output current fundamental phasors：WhereinFor the electricity of system
The angle values of source fundamental voltage output of voltage phasor,For the angle values of the electric power outputting current fundamental phasors of system.
The primary side tunable capacitor Cs1Voltage fundamental virtual value UC1With current first harmonics virtual value virtual value IC1Meet and closes
System：IC1=ωSCs1UC1；The primary side tunable capacitor voltage fundamental phasorWith current first harmonics phasorBetween phase difference it is full
Sufficient relationship：WhereinFor the angle values of the primary side tunable capacitor voltage fundamental phasor of system,For
The angle values of the primary side tunable capacitor current first harmonics phasor of system；The pair side tunable capacitor Cs2Voltage fundamental virtual value UC2
With current first harmonics virtual value IC2Meet relationship：IC2=ωSCs2UC2；Pair side tunable capacitor voltage fundamental phasorAnd electric current
Fundamental phasorsBetween phase difference meet relationship：WhereinFor the secondary side tunable capacitor electricity of system
The angle values of fundamental phasors are pressed,For the angle values of the secondary side tunable capacitor current first harmonics phasor of system.
The quality factor q of the primary side resonator1=ω1/2γ1At least more than 100, the quality of the pair side resonator because
Number Q2=ω2/2γ2At least more than 100.
The utility model compared with prior art, has the following advantages that and advantageous effect：
1, system structure is simple, and realization method is various.
2, system operating frequency does not change, and filter design is more simple, to having with the application that frequency band limits
Stronger adaptability.
3, the efficiency of transmission of system and transimission power are insensitive to the variation of transmission range, it can be achieved that the radio energy stablized
Transmission.
Description of the drawings
Fig. 1 is the circuit system provided in embodiment.
Fig. 2 is tunable capacitor capacitance and mutual inductance relationships figure.
Fig. 3 is tunable capacitor capacitance and load relationship figure.
Fig. 4 is the oscillogram of primary side resonator electric current and secondary side resonator electric current in embodiment.
Fig. 5 is the oscillogram of primary side resonator voltage and secondary side resonator voltage in embodiment.
Fig. 6 is the relational graph of efficiency of transmission and transmission range in embodiment.
Fig. 7 is the relational graph of output power and transmission range in embodiment.
Specific implementation mode
With reference to specific embodiment, the utility model is described in further detail.
As shown in Figure 1, the intrinsic angular frequency control magnetic resonance SS type radio energy transmission systems that the present embodiment is provided, by
Constant frequency AC power US, primary side resonator, secondary side resonator and load composition；
The constant frequency AC power USIt is connected with primary side resonator, working frequency fSAnd work angular frequencys=2 π
fSIt remains unchanged；
The primary side resonator is by primary side tunable capacitor Cs1With primary side inductance coil L1It is connected in series, the primary side inductor wire
Enclose L1With primary coil internal resistance RS1, the primary side resonator is with natural resonance angular frequencyWith primary side internal resistance
Loss factor γ1=RS1/2L1；
It is described it is secondary while resonator by it is secondary while tunable capacitor Cs2With secondary inductance coil L2It is connected in series, the secondary inductance line
Enclose L2With secondary coil internal resistance RS2, the pair side resonator is with natural resonance angular frequencyWith secondary side internal resistance
Loss factor γ2=RS2/2L2；
The load RLIt is connected with secondary side resonator, corresponds to load loss coefficient gammaL=RL/2L2；
The primary side resonator and secondary side resonator are intercoupled by magnetic field, and the intensity of coupling is by mutual inductance M or coupled systemes
NumberCharacterization；
The capacitance of the primary side tunable capacitor and secondary side tunable capacitor is controlled by external signal, humorous to adjust primary side
Shake the natural angular frequency ω of device1With the natural angular frequency ω of secondary side resonator2, make the intrinsic angular frequency of the systemeWith it is constant
The work angular frequency of frequency AC sourcesKeep identical.
The quality factor q of the primary side resonator1=ω1/2γ1At least more than 100, the quality of the pair side resonator because
Number Q2=ω2/2γ2At least more than 100.
For easy analysis, primary side resonator, secondary side resonator coil inductance and internal resistance is enabled to distinguish equal, i.e. Rs1=Rs2
=R0, L1=L2=L0.It assumes initially that the angular frequency of power supply is variable, ω is expressed as, then the coupling mode equations of system are：
In formula,For the internal resistance loss factor of former and deputy side resonator,For load loss coefficient,The coefficient of coup between transmitting and receiving circuit, F are the relevant normal number of amplitude with driving source,
The size of its value does not influence analysis result.Pattern a1、a2It can be to be defined as follows
Wherein i1、i2The respectively electric current of primary side inductance and secondary inductance, u1、u2Respectively primary side tunable capacitor and secondary side
The fundamental voltage of capacitance, I1m、I2mThe respectively current amplitude of primary side inductance and secondary inductance.Therefore between pattern and power
Relationship is
Px=2 γx|ax|2(4)
Wherein, PxFor resistance RxThe power of upper generation, γxFor resistance RxCorresponding loss factor, | ax|2For resistance corresponding sides
The mould square of pattern.
Enable the frequency and pattern a of power supply1And a2It is equal, then a1With driving source FejωtBetween relationship can be expressed as
Ga1=Fejωt (5)
The value of g can also be obtained by the ratio between supply voltage and source current, i.e.,
As the increase of a1 modulus value, the modulus value of g can be gradually reduced it can be seen from formula (5).Formula (5) is substituted into formula (1) simultaneously
The characteristic value for solving equation, can obtain
If enabling ω1=ω2=ω0, then formula (7) can be reduced to
The pattern solution of system is：
Wherein
Wherein, the real part in the pattern solution of system represents the gain/attenuation item of system.The feelings existing for the real part of pattern solution
Under condition, pattern a1And a2Modulus value can change.In order to reach stable state, power supply can automatically be adjusted g values, so that
The real part of pattern solution is equal to 0, i.e., the imaginary part of intrinsic angular frequency is equal to 0.When the system is stable, g values can be stablized in a certain determining value,
Intrinsic angular frequency can also reach stationary value.Intrinsic angular frequency when the control strategy of the utility model is that system is enabled to stablize is just
Equal to the work angular frequency of constant frequency power supply.According to the size in (8) radical sign, the steady-working state of system can be divided into
Two kinds of situations.
(1)κ2≥(γ0+γL)2.It is zero to enable (8) formula imaginary part, can be obtained
Formula (11) is substituted into formula (8), if making the intrinsic angular frequency of system just be equal to power supply angular frequency, then original can be obtained
Natural angular frequency in resonator and resonator when pair should be
The tunable capacitor of primary and secondary side should be adjusted at this time
Convolution (9), the ratio between square that can obtain former and deputy edge mode at this time are：
So, the efficiency of transmission of system is：
The output power of system is：
By (15), (16) formula it is found that in κ2≥(γ0+γL)2Under the premise of, if keeping the electricity of radio energy transmission system
Source angular frequency is equal to the intrinsic angular frequency of system, and the efficiency of transmission and output power of system are unrelated with coefficient of coup κ, i.e. transmission range
When change, the efficiency of transmission of system, output power remain unchanged.And observation type (15) is if it is found that primary and secondary side coil
When internal resistance is smaller, system can keep very high efficiency.
(2) κ ＜ γ0+γL.It is zero to enable (8) formula imaginary part, can be obtained：
Formula (17) is substituted into formula (8), the natural angular frequency for obtaining former secondary side when system is stablized is
ω0=ωS (18)
The capacitance of primary and secondary side should be adjusted at this time
So there is the ratio between primary and secondary side pattern square
The efficiency of transmission of system is
The output power of system is：
Therefore, in κ ＜ γ0+γLUnder the premise of, if the natural angular frequency phase of the intrinsic angular frequency of system and primary and secondary side
Together, then the efficiency of transmission of system will be reduced with the increase of distance, and output power will also change with distance change.
In conclusion the efficiency of transmission of system is：
As the above analysis, when system is operated in κ >=γ0+γLIn region, when system is finally stablized, the voltage of power supply
Meet relationship g=2 γ with the ratio between electric current0+γL, i.e. the virtual value of supply voltage fundamental wave and current first harmonics meets relationship：The phase of supply voltage fundamental wave and current first harmonics meets relationship：At this point, in order to
Keep the intrinsic angular frequency of system identical as supply frequency, the capacitance of primary side tunable capacitor and secondary side tunable capacitor need to be adjusted toThe efficiency of transmission of system remainsIt is constant.When system is operated in κ ＜ γ0+
γLIn region, the ratio between voltage and electric current of power supply meet relationshipCapacitance is adjusted at this timeSystem efficiency of transmission changes with the coefficient of coup between transmitting and receiving circuit, is
If the supply frequency of primary side resonator and secondary side resonator is f0=800kHz, and remain unchanged；Primary side, secondary side electricity
Sense is L=100 μ H；Internal resistance is RS=1.3 Ω.
The capacitance of former and deputy side tunable capacitor with former and deputy sideline enclose between transmission range, load change and change,
So that the intrinsic angular frequency of system is equal to power supply angular frequency.Fig. 2 is that load keeps RLWhen=30 Ω, former and deputy side tunable capacitor
Capacitance with mutual inductance situation of change.It is computed, critical mutual inductance value is Mth=6.2269 μ H.When mutual inductance is higher than critical value, system
Intrinsic angular frequency will appear separating phenomenon.Thus corresponding adjustable electric capacitance also divides.Fig. 3 is that mutual inductance keeps M=10 μ
When H, the capacitance of tunable capacitor with load situation of change.
Fig. 4, Fig. 5 are respectively mutual inductance M=10 μ H, load RLWhen=30 Ω, the waveform of former and deputy side resonator electric current and voltage
Figure.Mutual inductance at this time is in critical condition or more, and system efficiency of transmission is higher.
The relation curve of the efficiency of transmission of system, transimission power and transmission range is as shown in Figure 6, Figure 7.Wherein, connect in figure
Continuous curve is calculated value, and scatterplot is simulation value.Theoretical value is consistent with the structure of simulation value.When system is operated in κ >=γ0+
γLIn region, efficiency of transmission is keptIt is invariable, when system is operated in κ ＜ γ0+γLIn region, efficiency of transmission with
The coefficient of coup between transmitting and receiving circuit changes, and is
As the above analysis, the intrinsic angular frequency of the utility model controls magnetic resonance SS type radio energy transmission systems,
This system is adjusted former and deputy side capacitance in the case where load and distance change, and intrinsic angular frequency when system being made to stablize begins
It is equal to the work angular frequency of constant frequency power supply eventually.And within the scope of a certain distance, system can keep efficiency of transmission and
Output power it is constant, realize stable wireless power transmission.Compared to traditional fixed frequency wireless power transmission systems and frequency with
There is simple in structure, working frequency to fix for track wireless power transmission systems, the utility model, and the various advantage of implementation method is worth pushing away
Extensively.
Embodiment described above is only the preferred embodiment of the utility model, and the implementation of the utility model is not limited with this
Range, therefore change made by all shapes according to the utility model, principle, it should all cover within the protection scope of the present utility model.
Claims (4)
1. a kind of intrinsic angular frequency controls magnetic resonance SS type radio energy transmission systems, it is characterised in that：The system is by constant
Frequency AC source US, primary side resonator, secondary side resonator and load composition；
The constant frequency AC power USIt is connected with primary side resonator, working frequency fSAnd work angular frequencys=2 π fSIt protects
It holds constant；
The primary side resonator is by primary side tunable capacitor Cs1With primary side inductance coil L1It is connected in series, the primary side inductance coil L1
With primary coil internal resistance RS1, the primary side resonator is with natural resonance angular frequencyIt is lost with primary side internal resistance
Coefficient gamma1=RS1/2L1；
It is described it is secondary while resonator by it is secondary while tunable capacitor Cs2With secondary inductance coil L2It is connected in series, the secondary inductance coil L2
With secondary coil internal resistance RS2, the pair side resonator is with natural resonance angular frequencyIt is lost with secondary side internal resistance
Coefficient gamma2=RS2/2L2；
The load RLIt is connected with secondary side resonator, corresponds to load loss coefficient gammaL=RL/2L2；
The primary side resonator and secondary side resonator are intercoupled by magnetic field, and the intensity of coupling is by mutual inductance M or the coefficient of coupCharacterization；
The capacitance of the primary side tunable capacitor and secondary side tunable capacitor is controlled by external signal, to adjust primary side resonator
Natural angular frequency ω1With the natural angular frequency ω of secondary side resonator2, make the intrinsic angular frequency of the systemeWith constant frequency
The work angular frequency of AC powersKeep identical.
2. a kind of intrinsic angular frequency according to claim 1 controls magnetic resonance SS type radio energy transmission systems, feature
It is：The intrinsic angular frequency of the systemeBy primary side internal resistance loss factor, secondary side internal resistance loss factor, load loss coefficient,
The natural angular frequency of the coefficient of coup, the natural angular frequency of primary side resonator and secondary side resonator determines；The alternating current of the system
When source angular frequency is identical as intrinsic angular frequency, the AC power fundamental voltage output of voltage virtual value U of the systemSIt is defeated with AC power
Go out current first harmonics virtual value ISMeet relationship：The electric power output voltage fundamental phasors of the system
With AC power output current fundamental phasorsPhase difference meet relationship：WhereinFor the electricity of system
The angle values of source fundamental voltage output of voltage phasor,For the angle values of the electric power outputting current fundamental phasors of system.
3. a kind of intrinsic angular frequency according to claim 1 controls magnetic resonance SS type radio energy transmission systems, feature
It is：The primary side tunable capacitor Cs1Voltage fundamental virtual value UC1With current first harmonics virtual value virtual value IC1Meet relationship：IC1
=ωSCs1UC1；The primary side tunable capacitor voltage fundamental phasorWith current first harmonics phasorBetween phase difference meet close
System：WhereinFor the angle values of the primary side tunable capacitor voltage fundamental phasor of system,For system
Primary side tunable capacitor current first harmonics phasor angle values；The pair side tunable capacitor Cs2Voltage fundamental virtual value UC2And electricity
Flow fundamental wave virtual value IC2Meet relationship：IC2=ωSCs2UC2；Pair side tunable capacitor voltage fundamental phasorAnd current first harmonics
PhasorBetween phase difference meet relationship：WhereinFor the secondary side tunable capacitor voltage base of system
The angle values of wave phasor,For the angle values of the secondary side tunable capacitor current first harmonics phasor of system.
4. a kind of intrinsic angular frequency according to claim 1 controls magnetic resonance SS type radio energy transmission systems, feature
It is：The quality factor q of the primary side resonator1=ω1/2γ1At least more than 100, the quality factor of pair side resonator
Q2=ω2/2γ2At least more than 100.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820180997.7U CN207835173U (en) | 2018-02-02 | 2018-02-02 | A kind of intrinsic angular frequency control magnetic resonance SS type radio energy transmission systems |
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|---|---|---|---|
| CN201820180997.7U CN207835173U (en) | 2018-02-02 | 2018-02-02 | A kind of intrinsic angular frequency control magnetic resonance SS type radio energy transmission systems |
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ID=63396551
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| CN201820180997.7U Withdrawn - After Issue CN207835173U (en) | 2018-02-02 | 2018-02-02 | A kind of intrinsic angular frequency control magnetic resonance SS type radio energy transmission systems |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108155729A (en) * | 2018-02-02 | 2018-06-12 | 华南理工大学 | A kind of intrinsic angular frequency control magnetic resonance SS type radio energy transmission systems |
| US11601020B2 (en) | 2019-10-15 | 2023-03-07 | Zhejiang University | Incompletely compensated wireless power transfer system |
-
2018
- 2018-02-02 CN CN201820180997.7U patent/CN207835173U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108155729A (en) * | 2018-02-02 | 2018-06-12 | 华南理工大学 | A kind of intrinsic angular frequency control magnetic resonance SS type radio energy transmission systems |
| CN108155729B (en) * | 2018-02-02 | 2023-08-22 | 华南理工大学 | Intrinsic angular frequency control magnetic resonance SS type wireless power transmission system |
| US11601020B2 (en) | 2019-10-15 | 2023-03-07 | Zhejiang University | Incompletely compensated wireless power transfer system |
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