CN107666183A - Series and parallel type radio energy transmission system based on feedback resonance formula power supply - Google Patents
Series and parallel type radio energy transmission system based on feedback resonance formula power supply Download PDFInfo
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- CN107666183A CN107666183A CN201710934591.3A CN201710934591A CN107666183A CN 107666183 A CN107666183 A CN 107666183A CN 201710934591 A CN201710934591 A CN 201710934591A CN 107666183 A CN107666183 A CN 107666183A
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 55
- 230000009897 systematic effect Effects 0.000 claims abstract description 5
- 230000008878 coupling Effects 0.000 claims description 9
- 238000010168 coupling process Methods 0.000 claims description 9
- 238000005859 coupling reaction Methods 0.000 claims description 9
- 238000005516 engineering process Methods 0.000 description 4
- 238000004088 simulation Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
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- 230000006641 stabilisation Effects 0.000 description 1
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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 series and parallel type radio energy transmission system based on feedback resonance formula power supply, including feedback resonance formula power supply, primary side resonator, secondary resonator and load；Feedback resonance formula power supply is connected with primary side resonator, and its working frequency is the eigenfrequency of system, is determined by systematic parameter；Primary side resonator includes the primary side transmitting coil and primary side electric capacity being connected in series, and primary side inductance coil has primary coil internal resistance；Secondary resonator includes the secondary receiving coil and secondary electric capacity being connected in parallel, and secondary inductance coil has secondary coil internal resistance.The present invention is powered using feedback resonance formula power supply to system, system is 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, realize stable wireless power transmission.
Description
Technical field
The present invention relates to the field of wireless power transmission or wireless power transmission technology, refers in particular to one kind and is based on feedback resonance formula
The serial-parallel type radio energy transmission system of power supply.
Background technology
Wireless power transmission technology can be realized to be electrically isolated completely between power supply and electrical equipment, have safety, can
The advantages of leaning on, be flexible.Early in 19 end of the centurys, Ni Gula teslas (Nikola Tesla) utilize wireless power transmission principle,
A bulb has been lighted in the case of no any 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 increasing scholar is 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 are humorous
Shake between device when being weak coupling, 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 be 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, it is necessary to increase impedance transform part in receiving terminal.Work as original
When side resonator and secondary resonator are 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, but at intrinsic frequency system power with mutual inductance it is strong
The increase of degree is greatly reduced.Frequency corresponding to the peak power of system changes also with the change of the coefficient of coup and load.For
This needs to be tracked Frequency point corresponding to peak power.The algorithm of frequency-tracking mainly has three types at present：MPPT, chase after
Track original edge voltage, electric current phase zero points, follow the trail of original edge voltage and secondary current phase zero points.In implementation, frequency-tracking
It is generally necessary to additional phaselocked loop link, structure are 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 referred to 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
Fixed, but remain operating in eigenfrequency with the change of systematic parameter.And when transmission range is nearer, system
Efficiency of transmission can keep constant under eigenfrequency.These features make it that additional power source feedback resonance formula wireless power transmission systems can
With stable carry out electric energy transmission.
The content of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of string based on feedback resonance formula power supply
Connection-parallel connection type radio energy transmission system, system is powered using feedback resonance formula power supply, system is operated in intrinsic frequency
Under rate.When transmission range and load change, the frequency of system can be adjusted automatically, real in certain transmission range
Existing constant high-caliber efficiency of transmission, realizes stable wireless power transmission.
To achieve the above object, technical scheme provided by the present invention is：Serial-parallel based on feedback resonance formula power supply
Type radio energy transmission system, including feedback resonance formula power supply, primary side resonator, secondary resonator and load RL；The feedback
Resonant mode power supply is connected with primary side resonator, and its frequency automatically adjusts with the change of systematic parameter, and last stabilization exists
The eigenfrequency of system；The primary side resonator is by primary side electric capacity C1With primary side inductance coil L1It is in series, the primary side inductance
Coil has primary coil internal resistance RS1, primary side resonance field has 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 above 100；The secondary resonator by
Secondary electric capacity C2With secondary inductance coil L2It is formed in parallel, secondary inductance coil has secondary coil internal resistance RS2, secondary resonance field
With resonance angular frequency ω2With secondary internal resistance loss factor γ2, wherein γ2=RS2/2L2, the quality of the secondary resonator because
Number Q2=ω2/2γ2, at least above 100；The load RLIt is connected with secondary resonator, load loss coefficient in corresponding resonance field
γL=1/2C2RL；The former and deputy side resonator structure is intercoupled by magnetic field, and stiffness of coupling is expressed as coefficient of coup κ；Institute
The eigenfrequency of system is stated by primary side internal resistance loss factor γ1, secondary internal resistance loss factor γ2, load loss coefficient gammaL, coupling
Coefficient κ and two resonators natural angular frequency ω1、ω2It is determined that.
The present invention compared with prior art, has the following advantages that and beneficial effect：
1st, system architecture is simple, and implementation is various.
2nd, change of the system effectiveness to transmission range is insensitive, and stable wireless power transmission can be achieved.
3rd, system is rapider to transmission range, load change response.
Brief description of the drawings
Fig. 1 is the system circuit diagram provided in embodiment.
Fig. 2 is the graph of a relation of system eigenfrequency and mutual inductance.
Fig. 3 is system eigenfrequency and the graph of a relation of load.
Fig. 4 is the oscillogram of primary side resonator electric current and secondary resonator electric current in embodiment.
Fig. 5 is the oscillogram of primary side resonator voltage and secondary resonator voltage in embodiment.
Fig. 6 is the graph of a relation of efficiency of transmission and transmission range in embodiment.
Embodiment
With reference to specific embodiment, the invention will be further described.
As shown in figure 1, be the specific implementation circuit of the system, including feedback resonance formula power supply S, primary side resonator, secondary
Resonator and load RL；The feedback resonance formula power supply S is connected with primary side resonator, and its frequency is entered with the change of systematic parameter
Row automatically adjusts, and the last stable eigenfrequency f in systeme；The primary side resonator is by primary side electric capacity C1With primary side inductor wire
Enclose L1It is in series, the primary side inductance coil has primary coil internal resistance RS1, primary side resonance field has 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；The secondary resonator is by secondary electric capacity C2With secondary inductance coil L2It is formed in parallel, secondary inductance coil has secondary
Coil resistance RS2, secondary resonance field has resonance angular frequency ω2With secondary internal resistance loss factor γ2, wherein γ2=RS2/2L2, institute
State the quality factor q of secondary resonator2=ω2/2γ2, at least above 100；The load RLIt is connected with secondary 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 internal resistance loss factor
γ2, load loss coefficient gammaL, coefficient of coup κ and two resonators natural angular frequency ω1、ω2It is determined that.
For easy analysis, make the natural angular frequency of primary side resonator and secondary 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 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 relevant normal number of amplitude, the size of its value do not influence on analysis result.ω is the work angular frequency of system.a1、a2
A can be written respectively as10ejωt、a20ejωt, wherein a10、a20Respectively a1、a2Amplitude.a1With driving source FejωtBetween relation
It can be expressed as
ga1=Fejωt (2)
With a it can be seen from formula (2)1The increase of modulus value, g modulus value 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 systemCause pattern a1And a2Modulus value occur
Change.Stable in order to reach, g can be adjusted automatically for feedback resonance formula power supply, until system reaches stable.System stable state
It is divided into two kinds of situations.As κ >=γ0+γLWhen, the imaginary part for making characteristic value is zero, can be obtained：
G=2 γ0+γL (6)
Intrinsic angular frequency when system is stablized, which can be obtained, is：
Then：
The efficiency of transmission of system is：
From (6) formula, the efficiency of transmission and coefficient of coup κ of system are unrelated, i.e., when transmission range changes, the transmission of system
Efficiency keeps constant.
In another case, there are κ ＜ γ0+γL.The imaginary part for making characteristic value is zero, can be obtained：
Intrinsic angular frequency when system is stablized, which can be obtained, is
ω=ω0 (11)
So have
The efficiency of transmission of system is
In summary, 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 resonance
Device internal resistance and load absorption, i.e. g=2 γ0+γL, when system is operated in κ >=γ0+γLIn region, its working frequency isEfficiency of transmission is keptIt is invariable, when system is operated in κ ＜ γ0+γLRegion
Interior, its working frequency is ω=ω0, efficiency of transmission between primary side resonator and secondary resonator the coefficient of coup change, be
If the intrinsic frequency of primary side resonator and secondary resonator is f0=800kHz, primary side inductance and secondary inductance are
L=100 μ H, primary side electric capacity and secondary electric capacity are C=395.79pF, and the internal resistance of primary side resonator and secondary 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 internal resistance
Loss factor, load loss coefficient, the natural angular frequency of the coefficient of coup and two resonators determine.Fig. 2 be system eigenfrequency with
The graph of a relation of mutual inductance, Fig. 3 are the eigenfrequency and the graph of a relation of load of system.It can be seen that simulation result is missing with theory analysis
It is consistent in poor allowed band.
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, it is 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, its working frequency isEfficiency of transmission is keptIt is invariable, when system work
Make in κ ＜ γ0+γLIn region, its working frequency is ω=ω0, efficiency of transmission is between primary side resonator and secondary resonator
The coefficient of coup change, be
As the above analysis, the serial-parallel type wireless power transmission system of the invention based on feedback resonance formula power supply
System, this system always work in eigenfrequency in the case where loading with distance change, realize automatically adjusting for frequency.And
In the range of a certain distance, system can keep efficiency of transmission constant, realize stable wireless power transmission.Compared to more traditional
Fixed frequency wireless power transmission systems and frequency-tracking wireless power transmission systems, the present invention there is simple in construction, fast response time, reality
The advantages of now method is various, is worthy to be popularized.
Examples of implementation described above are only the preferred embodiments of the invention, and the implementation model of the present invention is not limited with this
Enclose, therefore the change that all shape, principles according to the present invention are made, it all should cover within the scope of the present invention.
Claims (1)
1. the serial-parallel type radio energy transmission system based on feedback resonance formula power supply, it is characterised in that：Including feedback resonance
Formula power supply, primary side resonator, secondary resonator and load RL；The feedback resonance formula power supply is connected with primary side resonator, its frequency
Rate automatically adjusts with the change of systematic parameter, and the last stable eigenfrequency in system；The primary side resonator by
Primary side electric capacity C1With primary side inductance coil L1It is in series, the primary side inductance coil has primary coil internal resistance RS1, primary side is humorous
The field that shakes has 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 above 100；The secondary resonator is by secondary electric capacity C2With secondary inductance coil L2It is in parallel and
Into secondary inductance coil has secondary coil internal resistance RS2, secondary resonance field has resonance angular frequency ω2It is lost with secondary internal resistance and is
Number γ2, wherein γ2=RS2/2L2, the quality factor q of the secondary resonator2=ω2/2γ2, at least above 100；The load
RLIt is connected with secondary resonator, load loss coefficient gamma in corresponding resonance fieldL=1/2C2RL；The former and deputy side resonator structure
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 internal resistance loss factor γ2, load loss coefficient gammaL, coefficient of coup κ and two resonators natural angular frequency ω1、ω2
It is determined that.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108306420A (en) * | 2018-03-14 | 2018-07-20 | 华南理工大学 | A kind of double coupling hybrid wireless electric energy Transmission systems of serial-parallel type |
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| CN104682575A (en) * | 2015-03-01 | 2015-06-03 | 华南理工大学 | Resonance type wireless power transmission system with double-terminal impedance transformer networks |
| CN106410986A (en) * | 2016-11-17 | 2017-02-15 | 华南理工大学 | Fractional order wireless electric energy transmission system using fractional order inductor to counteract internal resistance |
| CN207835166U (en) * | 2017-10-10 | 2018-09-07 | 华南理工大学 | Serial-parallel type radio energy transmission system based on feedback resonance formula power supply |
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- 2017-10-10 CN CN201710934591.3A patent/CN107666183B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104682575A (en) * | 2015-03-01 | 2015-06-03 | 华南理工大学 | Resonance type wireless power transmission system with double-terminal impedance transformer networks |
| CN106410986A (en) * | 2016-11-17 | 2017-02-15 | 华南理工大学 | Fractional order wireless electric energy transmission system using fractional order inductor to counteract internal resistance |
| CN207835166U (en) * | 2017-10-10 | 2018-09-07 | 华南理工大学 | Serial-parallel type radio energy transmission system based on feedback resonance formula power supply |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108306420A (en) * | 2018-03-14 | 2018-07-20 | 华南理工大学 | A kind of double coupling hybrid wireless electric energy Transmission systems of serial-parallel type |
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