CN207835165U - Parallel connection based on feedback resonance formula power supply-parallel connection type radio energy transmission system - Google Patents
Parallel connection based on feedback resonance formula power supply-parallel connection type radio energy transmission system Download PDFInfo
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- CN207835165U CN207835165U CN201721298793.5U CN201721298793U CN207835165U CN 207835165 U CN207835165 U CN 207835165U CN 201721298793 U CN201721298793 U CN 201721298793U CN 207835165 U CN207835165 U CN 207835165U
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Abstract
The utility model discloses a kind of parallel connection type radio energy transmission systems in parallel based on feedback resonance formula power supply, including feedback resonance formula power supply, primary side resonator, secondary side resonator and load；The feedback resonance formula power supply is connected with primary side resonator, and working frequency is the eigenfrequency of system, is determined by systematic parameter；The primary side resonator includes the primary side transmitting coil being connected in parallel and primary side capacitance, and primary side inductance coil has primary coil internal resistance；It is described it is secondary while resonator include be connected in parallel it is secondary while receiving coil and secondary side capacitance, secondary inductance coil there is secondary coil internal resistance.The utility model is powered system using feedback resonance formula power supply, and system is made to be operated under eigenfrequency.When transmission range and load change, the frequency of system can be adjusted automatically, and constant high-caliber efficiency of transmission is realized in certain transmission range, realizes stable wireless power transmission.
Description
Technical field
The utility model is related to the fields of wireless power transmission or wireless power transmission technology, refer in particular to a kind of humorous based on feeding back
The parallel connection of formula of shaking power supply-parallel connection type radio energy transmission system.
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.When primary side resonator and secondary side are humorous
Shake between device for weak coupling when, the resonance type wireless power transmission mode of generally use fixed frequency.Wherein, former and deputy side resonator is consolidated
Have that frequency is equal, and is the working frequency of system.Resonance type wireless, which is transmitted electricity, can transmit farther distance, but efficiency of transmission
It is greatly reduced with the increase of distance, in order to keep regulated power to transmit, needs to increase impedance transform part in receiving terminal.Work as original
When in resonator and pair, resonator is close coupling, generally use frequency follow-up system wireless power transmission mode.Frequency follow-up system is wireless
Transmission of electricity also require that the intrinsic frequency of former and deputy side resonator is equal, however at intrinsic frequency system power with mutual inductance it is strong
The increase of degree is greatly reduced.The corresponding frequency of maximum power of system changes also with the variation of the coefficient of coup and load.For
This is needed to the corresponding Frequency point of maximum power into line trace.There are mainly three types of types for the algorithm of frequency-tracking at present：MPPT is chased after
Track original edge voltage, electric current phase zero points track original edge voltage and secondary current phase zero points.In implementation, frequency-tracking
Additional phaselocked loop link is usually required, structure is complex.
What the working frequency of feedback resonance formula system was determined by system parameter values, be the inherent feature of system, therefore this
One frequency is known as characteristic frequency, also known as eigenfrequency.In the feedback resonance formula system of additional power source, the working frequency of power supply is not
It is fixed, but remain operating in eigenfrequency with the variation of systematic parameter.And when transmission range is closer, system
Efficiency of transmission can be kept constant under eigenfrequency.These features so that additional power source feedback resonance formula wireless power transmission systems can
With stable carry out electric energy transmission.
Invention content
The purpose of the utility model is to overcome the deficiencies in the prior art, provide a kind of based on feedback resonance formula power supply
Parallel connection-parallel connection type radio energy transmission system is powered system using feedback resonance formula power supply, so that system is operated in intrinsic
Under frequency.When transmission range and load change, the frequency of system can be adjusted automatically, in certain transmission range
It realizes constant high-caliber efficiency of transmission, realizes stable wireless power transmission.
To achieve the above object, technical solution provided by the utility model is：Parallel connection-based on feedback resonance formula power supply
Parallel connection type radio energy transmission system, including feedback resonance formula power supply, primary side resonator, secondary side resonator and load RL；It is described
Feedback resonance formula power supply is connected with primary side resonator, and frequency automatically adjusts with the variation of systematic parameter, and last steady
It is scheduled on the eigenfrequency of system；The primary side resonator is by primary side capacitance C1With primary side inductance coil L1It is formed in parallel, the primary side
Inductance coil has primary coil internal resistance RS1, primary side resonance field is with resonance angular frequency ω1With primary side internal resistance loss factor γ1,
Wherein γ1=RS1/2L1, the quality factor q of the primary side resonator1=ω1/2γ1, at least more than 100；Pair side resonance
Device is by secondary side capacitance C2With secondary inductance coil L2It is formed in parallel, secondary inductance coil has secondary coil internal resistance RS2, secondary side is humorous
Field shake with resonance angular frequency ω2With secondary side internal resistance loss factor γ2, wherein γ2=RS2/2L2, the product of pair side resonator
Prime factor Q2=ω2/2γ2, at least more than 100；The load RLIt is connected with secondary side resonator, load loss in corresponding resonance field
Coefficient gammaL=1/2C2RL；The former and deputy side resonator structure is intercoupled by magnetic field, and stiffness of coupling is expressed as the coefficient of coup
κ；The eigenfrequency of the system is by primary side internal resistance loss factor γ1, secondary side internal resistance loss factor γ2, load loss coefficient gammaL、
The natural angular frequency ω of coefficient of coup κ and two resonators1、ω2It determines.
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 effectiveness is insensitive to the variation of transmission range, it can be achieved that the wireless power transmission stablized.
3, system is rapider to transmission range, load variation response.
Description of the drawings
Fig. 1 is the system circuit diagram provided in embodiment.
Fig. 2 is the relational graph of system eigenfrequency and mutual inductance.
Fig. 3 is the relational graph of system eigenfrequency and load.
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.
Specific implementation mode
With reference to specific embodiment, the utility model is described in further detail.
As shown in Figure 1, for the specific implementation circuit of this system, including feedback resonance formula power supply S, primary side resonator, secondary side
Resonator and load RL；The feedback resonance formula power supply S is connected with primary side resonator, frequency with systematic parameter variation into
Row automatic adjustment, and the last eigenfrequency f stablized in systeme；The primary side resonator is by primary side capacitance C1With primary side inductor wire
Enclose L1It is formed in parallel, the primary side inductance coil has primary coil internal resistance RS1, primary side resonance field is with resonance angular frequency ω1With
Primary side internal resistance loss factor γ1, wherein γ1=RS1/2L1, the quality factor q of the primary side resonator1=ω1/2γ1, at least greatly
In 100；It is described it is secondary while resonator by it is secondary while capacitance C2With secondary inductance coil L2It is formed in parallel, secondary inductance coil has secondary side
Coil resistance RS2, secondary side resonance field is with resonance angular frequency ω2With secondary side internal resistance loss factor γ2, wherein γ2=RS2/2L2, institute
State the quality factor q of secondary side resonator2=ω2/2γ2, at least more than 100；The load RLIt is connected with secondary side resonator, it is corresponding
Load loss coefficient gamma in resonance fieldL=1/2C2RL；The former and deputy side resonator structure is intercoupled by magnetic field, and coupling is strong
Degree is expressed as coefficient of coup κ；The eigenfrequency f of the systemeBy primary side internal resistance loss factor γ1, secondary side internal resistance loss factor
γ2, load loss coefficient gammaL, coefficient of coup κ and two resonators natural angular frequency ω1、ω2It determines.
For easy analysis, enable the natural angular frequency of primary side resonator and secondary side resonator, Coil resistance difference equal, i.e.,
ω1=ω2=ω0, γ1=γ2=γ0.The coupling mode equations of system are：
In formula,For the coefficient of coup between primary side resonator and secondary side resonator,For primary side inductance coil
Mutual Inductance Coupling coefficient between secondary inductance coil, mutual inductances of the M between primary side inductance and secondary inductance.F is and driving source
The related normal number of amplitude, the size of value do not influence analysis result.ω is the work angular frequency of system.a1、a2
It can be written respectively as a10ejωt、a20ejωt, wherein a10、a20Respectively a1、a2Amplitude.a1With driving source FejωtBetween relationship
It can be expressed as
ga1=Fejωt (2)
With a it can be seen from formula (2)1The modulus value of the increase of modulus value, g can be gradually reduced.Formula (2) is substituted into formula (1) simultaneously
Characteristic value is solved, can be obtained
The pattern solution of system is：
Wherein
Wherein, there is gain/attenuation item in the pattern solution of systemLead to pattern a1And a2Modulus value change.
Stable in order to reach, feedback resonance formula power supply can automatically be adjusted g, until system reaches stable.System stable state is divided into
Two kinds of situations.As κ >=γ0+γLWhen, it is zero to enable the imaginary part of characteristic value, can with arrive
G=2 γ0+γL (6)
Can obtain intrinsic angular frequency when system is stablized is
Then：
The efficiency of transmission of system is：
By (6) formula it is found that the efficiency of transmission of system and coefficient of coup κ are unrelated, i.e., when transmission range changes, the transmission of system
Efficiency remains unchanged.
In another case, there is κ ＜ γ0+γL.It is zero to enable the imaginary part of characteristic value, can be obtained：
Can obtain intrinsic angular frequency when system is stablized is
ω=ω0 (11)
So have
The efficiency of transmission of system is
In conclusion the efficiency of transmission of system is：
As the above analysis, if the electric energy of feedback resonance formula power supply offer is completely by former resonator internal resistance, secondary side resonance
Device internal resistance and load absorption, i.e. g=2 γ0+γL, when system is operated in κ >=γ0+γLIn region, working frequency isEfficiency of transmission is keptIt is invariable, when system is operated in κ ＜ γ0+γLRegion
Interior, working frequency is ω=ω0, efficiency of transmission changes with the coefficient of coup between primary side resonator and secondary side resonator, is
If the intrinsic frequency of primary side resonator and secondary side resonator is f0=800kHz, primary side inductance and secondary inductance are
L=100 μ H, primary side capacitance and secondary side capacitance are C=395.79pF, and the internal resistance of primary side resonator and secondary side resonator internal resistance are
RS=1.3 Ω, load resistance RL=1k Ω.
The eigenfrequency of the wireless power transmission systems of additional feedback resonance formula power supply is by primary side internal resistance loss factor, secondary side internal resistance
The natural angular frequency determination of loss factor, load loss coefficient, the coefficient of coup and two resonators.Fig. 2 be system eigenfrequency with
The relational graph of mutual inductance, Fig. 3 are the relational graph of the eigenfrequency and load of system.It can be seen that simulation result is being missed with theory analysis
It is consistent in poor allowable range.
Fig. 4, Fig. 5 are respectively to work as mutual inductanceWhen, the waveform of former and deputy side resonator electric current and voltage
Figure.
By formula (14) can obtain system efficiency of transmission and transmission range relation curve it is as shown in Figure 6.Wherein, continuous in figure
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+γL
In region, working frequency isEfficiency of transmission is keptIt is invariable, when system work
Make in κ ＜ γ0+γLIn region, working frequency is ω=ω0, efficiency of transmission is between primary side resonator and secondary side resonator
The coefficient of coup variation, be
As the above analysis, the parallel connection based on feedback resonance formula power supply of the utility model-parallel connection type radio energy passes
Defeated system, this system always work in eigenfrequency in the case of load and distance change, realize the automatic adjustment of frequency.
And within the scope of a certain distance, system can keep efficiency of transmission constant, realize stable wireless power transmission.It compares
Traditional fixed frequency wireless power transmission systems and frequency-tracking wireless power transmission systems, the utility model have simple in structure, response
Speed is fast, and the various advantage of implementation method is worthy to be popularized.
The examples of implementation of the above are only the preferred embodiment of the utility model, not limit the utility model with this
Practical range, therefore change made by all shapes according to the utility model, principle, it should all cover in the scope of protection of the utility model
It is interior.
Claims (1)
1. the parallel connection based on feedback resonance formula power supply-parallel connection type radio energy transmission system, it is characterised in that：Including feedback resonance
Formula power supply, primary side resonator, secondary side resonator and load RL；The feedback resonance formula power supply is connected with primary side resonator, frequency
Rate automatically adjusts with the variation of systematic parameter, and the last eigenfrequency stablized in system；The primary side resonator by
Primary side capacitance C1With primary side inductance coil L1It is formed in parallel, the primary side inductance coil has primary coil internal resistance RS1, primary side is humorous
Field shake with resonance angular frequency ω1With primary side internal resistance loss factor γ1, wherein γ1=RS1/2L1, the product of the primary side resonator
Prime factor Q1=ω1/2γ1, at least more than 100；It is described it is secondary while resonator by it is secondary while capacitance C2With secondary inductance coil L2It is in parallel and
At secondary inductance coil has secondary coil internal resistance RS2, secondary side resonance field is with resonance angular frequency ω2It is lost with secondary side internal resistance and is
Number γ2, wherein γ2=RS2/2L2, the quality factor q of pair side resonator2=ω2/2γ2, at least more than 100；The load
RLIt is connected with secondary side resonator, load loss coefficient gamma in corresponding resonance fieldL=1/2C2RL；The former and deputy side resonator structure
It is intercoupled by magnetic field, stiffness of coupling is expressed as coefficient of coup κ；The eigenfrequency of the system is by primary side internal resistance loss factor
γ1, secondary side internal resistance loss factor γ2, load loss coefficient gammaL, coefficient of coup κ and two resonators natural angular frequency ω1、ω2
It determines；When the system is operated in κ >=γ0+γLWhen in region, working frequency isTransmission
Efficiency is keptIt is invariable；When the system is operated in κ<γ0+γLWhen in region, working frequency is ω=ω0, pass
Defeated efficiency changes with the coefficient of coup between the primary side resonator and the secondary side resonator, is
Wherein, the primary side internal resistance loss factor is equal with the secondary side internal resistance loss factor, i.e. γ1=γ2=γ0, ω is the system
The working frequency of system.
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| CN107733103A (en) * | 2017-10-10 | 2018-02-23 | 华南理工大学 | Parallel connection type radio energy transmission system in parallel based on feedback resonance formula power supply |
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