CN108321944A - SS type field coupling radio energy transmission systems based on self-oscillation power supply - Google Patents
SS type field coupling radio energy transmission systems based on self-oscillation power supply Download PDFInfo
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- CN108321944A CN108321944A CN201810104443.3A CN201810104443A CN108321944A CN 108321944 A CN108321944 A CN 108321944A CN 201810104443 A CN201810104443 A CN 201810104443A CN 108321944 A CN108321944 A CN 108321944A
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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 SS type field coupling radio energy transmission systems based on self-oscillation power supply, including self-oscillation power supply, primary side resonator, secondary side resonator, coupled capacitor metal polar plate and load RL；Primary side resonator includes the primary side transmitting coil being connected in series with and primary side resonant capacitance C1, primary side transmitting coil includes the primary inductor L being connected in series with1With primary coil internal resistance R1；It is secondary while resonator include be connected in series with it is secondary while receiving coil and pair side resonant capacitance C2, secondary side receiving coil includes the secondary inductance L being connected in series with2With secondary coil internal resistance R2；Coupled capacitor metal polar plate connects primary side resonator and secondary side resonator；Self-oscillation power supply is connected with primary side resonator, loads RLIt is connected with secondary side resonator.The present invention is powered system using self-oscillation power supply, and system is made to be operated under eigenfrequency, and when transmission range changes, the frequency of system can be adjusted automatically, realizes constant high-caliber efficiency of transmission.
Description
Technical Field
The invention relates to the technical field of wireless power transmission, in particular to a SS type electric field coupling wireless power transmission system based on a self-oscillation power supply.
Background
Heretofore, the main transmission of electrical energy has been through metal wires, and two or more wires are usually required to provide a transmission channel for conducting current. The conventional wired power transmission method not only needs a large number of metal wires and complicated wiring work, but also has to ensure that the insulation between the metal wires is always kept in a good state, so that once a fault such as a short circuit occurs, a power failure accident is caused by the action of a relay protection device, and if the protection device fails, a fire hazard, an explosion hazard, an electric shock hazard or the like may be caused. Moreover, the wired power transmission mode also has the safety problems of exposed metal conductors, contact electric sparks, aging, abrasion of contact mechanisms and the like, safe and reliable power supply is difficult to realize in humid, underwater, mine and working environments containing flammable and explosive gases, and the flexibility of the power utilization device is greatly reduced due to the constraint of the wires. In order to solve the limitation of the wired power transmission mode, the wireless power transmission mode comes from the beginning and is continuously valued by people, the wireless power transmission mode has the advantages of convenience in power taking, metal resource saving, avoidance of complicated stringing engineering and the like, and the defect of the traditional wired power transmission mode is overcome.
The electric field coupling wireless power transmission technology is one of the most widely researched wireless power transmission technologies at present, and compared with the inductive coupling wireless power transmission technology, the electric field coupling wireless power transmission technology can achieve the same level of transmission distance, output power and transmission efficiency, but the energy transmission form is an interactive electric field, the transmission of energy is realized by taking a metal barrier as a part of a coupling polar plate to transmit energy without being blocked by the metal barrier, the electric field is basically limited between the coupling polar plates, and the electromagnetic interference is greatly reduced.
At present, the transmission efficiency of a traditional space electric field coupling wireless power transmission system is greatly influenced by the transmission distance, and the transmission efficiency is generally greatly reduced along with the increase of the distance, which is not beneficial to the practical application of the system.
The operating frequency of the SS-type electric field coupling wireless power transmission system with the additional self-oscillation power supply is determined by the system parameter values and is the inherent characteristic of the system, so that the frequency is called characteristic frequency, also called eigenfrequency. In a self-oscillating system with an external power supply, the operating frequency of the power supply is not fixed, but remains at the eigenfrequency as the system parameters change. And within the critical transmission distance, the output power and the transmission efficiency of the system can be kept constant at the eigenfrequency. The characteristics enable the SS type electric field coupling wireless power transmission system externally provided with the self-oscillation power supply to stably transmit power.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an SS type electric field coupling wireless electric energy transmission system based on a self-oscillation power supply.
In order to achieve the purpose, the technical scheme provided by the invention is as follows: the SS type electric field coupling wireless power transmission system based on the self-oscillation power supply comprises the self-oscillation power supply, a primary side resonator, a secondary side resonator, a coupling capacitor metal polar plate and a load RL(ii) a The primary side resonator comprises a primary side transmitting coil and a primary side resonant capacitor C which are connected in series1The primary side transmitting coil comprises a primary side inductor L connected in series1And internal resistance R of primary coil1The primary side resonance field of the primary side resonator has a resonance angular frequencyPrimary side internal resistance loss coefficient gamma1＝R1/2L1(ii) a The secondary resonator comprises a secondary receiving coil and a secondary resonant capacitor C connected in series2The secondary receiving coil comprises a secondary inductor L connected in series2And secondary coil internal resistance R2The secondary resonant field of the secondary resonator has a resonant angular frequencyAnd secondary side internal resistance loss coefficient gamma2＝R2/2L2(ii) a The coupling capacitor metal polar plate is connected with the primary side resonator and the secondary side resonator;
the self-excited oscillation power supply is connected with the primary side resonator, the angular frequency of the self-excited oscillation power supply is automatically adjusted along with the change of system parameters, and finally the angular frequency is stabilized at the intrinsic angular frequency of the system;
the load RLConnected with the secondary side resonator and corresponding to the load loss coefficient gamma in the resonance fieldL＝RL/2L2；
The primary and secondary resonators are coupled with each other by an electric field generated by a coupling capacitance metal plate between them.
The intrinsic angular frequency of the system is determined by the primary internal resistance loss coefficient, the secondary internal resistance loss coefficient, the load loss coefficient, the electric field coupling coefficient and the intrinsic angular frequencies of the primary resonator and the secondary resonator.
Quality factor Q of the primary resonator1＝ω1/2Γ1At least more than 100, quality factor Q of the secondary resonator2＝ω2/2Γ2At least greater than 100.
The coupling capacitance between the primary resonator and the secondary resonator is at least smaller than the primary resonance capacitance C1And secondary side resonance capacitor C2An order of magnitude.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the system has simple structure and various realization modes.
2. The output power and the transmission efficiency of the system are insensitive to the change of the transmission distance, and stable wireless power transmission can be realized.
3. The system responds more quickly to changes in transmission distance.
Drawings
Fig. 1 is a circuit diagram of a system provided in an embodiment.
Fig. 2 is a diagram of the relationship between the eigenfrequency of the system and the transmission distance.
Fig. 3 is a waveform diagram of the primary resonator current and the secondary resonator current in the embodiment.
Fig. 4 is a graph showing voltage waveforms of the primary resonator and the secondary resonator in the embodiment.
FIG. 5 is a graph of voltage waveforms of the coupling capacitor metal plate between the primary and secondary sides in the embodiment.
Fig. 6 is a graph of transmission efficiency versus transmission distance in an embodiment.
Fig. 7 is a graph of output power versus transmission distance for an embodiment.
Detailed Description
The present invention will be further described with reference to the following specific examples.
The SS type electric field coupling wireless electric energy transmission system based on the self-oscillation power supply has the basic principle that the self-oscillation power supply is used for supplying power to the system, so that the system works under the eigen frequency, when the transmission distance changes, the frequency of the system can be automatically adjusted, the constant high-level transmission efficiency is realized in a certain long transmission distance, the output power is kept constant, the stable electric energy transmission is realized, the problem that the transmission efficiency of the traditional electric field coupling wireless electric energy transmission system is rapidly reduced along with the increase of the distance is solved, and the constant power output is also kept.
As shown in figure 1, the SS type electric field coupling wireless power transmission system comprises a self-oscillation power supply uinPrimary side resonator, secondary side resonator and coupling capacitor metal polar plate C12And a load RL(ii) a The primary side resonator comprises a primary side transmitting coil and a primary side resonant capacitor C which are connected in series1The primary side transmitting coil comprises a primary side inductor L connected in series1And internal resistance R of primary coil1The primary side resonance field of the primary side resonator has a resonance angular frequencyPrimary side internal resistance loss coefficient gamma1＝R1/2L1(ii) a The secondary resonator comprises a secondary receiving coil and a secondary resonant capacitor C connected in series2The secondary receiving coil comprises a secondary inductor L connected in series2And secondary coil internal resistance R2The secondary resonant field of the secondary resonator has a resonant angular frequencyAnd secondary side internal resistance loss coefficient gamma2＝R2/2L2(ii) a The coupling capacitor metal polar plate C12Connecting the primary side resonator and the secondary side resonator;
the self-oscillation power supply uinThe primary side resonator is connected with the primary side resonator, the angular frequency of the primary side resonator is automatically adjusted along with the change of system parameters, and finally the primary side resonator is stabilized at the intrinsic angular frequency of the system;
the load RLConnected with the secondary side resonator and corresponding to the load loss coefficient gamma in the resonance fieldL＝RL/2L2；
The primary and secondary resonators are connected by coupling capacitance metal plate C12The mutual coupling is realized by the generated electric field, and the coupling strength of the electric field is represented by an electric field coupling coefficient k.
Quality factor Q of the primary resonator1＝ω1/2Γ1At least more than 100, quality factor Q of the secondary resonator2＝ω2/2Γ2At least greater than 100.
The coupling capacitance between the primary resonator and the secondary resonator is at least smaller than the primary resonance capacitance C1And secondary side resonance capacitor C2An order of magnitude.
For convenient analysis, the natural angular frequencies and coil internal resistances of the primary resonator and the secondary resonator are respectively equal, i.e. omega1＝ω2＝ω0，Γ1＝Γ2＝Γ0. The coupling mode equation of the system is
Wherein, a1、a2Can be written as A respectively1eiωt、A2eiωtWherein A is1、A2Are respectively provided withIs a1、a2The amplitude of (c).To reflect the power supply coefficient of the external excitation source, ω is the operating angular frequency of the system.The electric field coupling coefficient.Is the coupling capacitance value of the metal polar plate. And A is the area of the metal polar plate. d is the distance between the primary and secondary metal plates.
The intrinsic frequency value obtained from the formula (1) is
The mode of the system is solved into
Wherein,
wherein the system has gain/attenuation term in mode solutionResulting in mode a1And a2The modulus value of (a) changes. In order to achieve stability, the self-oscillation power supply can automatically couple g0Adjustments are made until the system stabilizes. The steady state of the system is divided into two cases:
when kappa is more than or equal to gamma0+ΓLWhen the imaginary part of the eigenvalue is zero, it can be
g0＝2Γ0+ΓL(5)
The eigen-angular frequency at which the system can be stabilized is obtained as
Then
The transmission efficiency of the system is
From the equation (8), the transmission efficiency of the system is independent of the electric field coupling coefficient κ, i.e. the transmission efficiency of the system remains unchanged when the transmission distance is changed.
The output power of the system is
From the equation (9), the output power of the system is independent of the electric field coupling coefficient κ, i.e. the output power of the system remains unchanged when the transmission distance is changed.
In another case, there is κ < Γ0+ΓL. Let the imaginary part of the eigenvalues be zero, one can get:
the eigen-angular frequency at which the system can be stabilized is obtained as
ω＝ω0(11)
Then there are
The transmission efficiency of the system is
The output power of the system is
In summary, the transmission efficiency of the system is
The output power of the system is
From the above analysis, if the power supplied by the external self-oscillation power source is completely absorbed by the internal resistance of the primary resonator, the internal resistance of the secondary resonator and the load, i.e. g0＝2Γ0+ΓLWhen the system works at kappa ≧ gamma0+ΓLIn the region of an operating frequency ofOutput power conservationConstant and maintaining transmission efficiencyConstant, when the system works at kappa < gamma0+ΓLWithin the region, the operating frequency is ω ═ ω0The output power and transmission efficiency are both varied with the electric field coupling coefficient between the transmitting circuit and the receiving circuit, respectivelyAnd
let the natural frequency of the primary and secondary resonators be f01MHz, the voltage of the DC power supply is Vin200V, the primary inductor and the secondary inductor are both L0253 mu H, the primary side resonance capacitor and the secondary side resonance capacitor are both C0The side length of the metal polar plate is 1m (100 pF), and in order to rationalize the parameters, the internal resistance of the primary coil and the internal resistance of the secondary coil are assumed to be R05 Ω, and a load resistance RL＝50Ω。
The intrinsic angular frequency of the SS type electric field coupling wireless power transmission system based on the self-excited oscillation power supply is determined by the primary side internal resistance loss coefficient, the secondary side internal resistance loss coefficient, the load loss coefficient, the electric field coupling coefficient and the intrinsic angular frequencies of the two resonators. Fig. 2 is a diagram of the relationship between the system eigenfrequency and the transmission distance, and it can be seen that the circuit simulation results are consistent with the theoretical analysis within the error tolerance range.
FIG. 3, FIG. 4 and FIG. 5 show the coupling capacitance C when the transmission distance is 1m12Current, voltage and coupling capacitance C of primary and secondary resonators at 8.85pF12Voltage waveform diagram of (2).
Fig. 6 shows a curve of the transmission efficiency versus the transmission distance of the system obtained from equation (15). Wherein the discrete filled circles represent the results of the circuit simulation. As can be seen from FIG. 6, when the system is operated at κ ≧ Γ0+ΓLIn the region, it worksAt a frequency ofTransmission efficiency preservationConstant, when the system works at kappa < gamma0+ΓLWithin the region, the operating frequency is ω ═ ω0The transmission efficiency varies with the electric field coupling coefficient between the transmitting circuit and the receiving circuit, and is
The output power of the system obtained from equation (16) is plotted against the transmission distance as shown in fig. 7. Wherein the discrete filled circles represent the results of the circuit simulation. As can be seen from FIG. 7, when the system is operated at κ ≧ Γ0+ΓLIn the region of an operating frequency ofOutput power conservationConstant, when the system works at kappa < gamma0+ΓLWithin the region, the operating frequency is ω ═ ω0The output power varies with the electric field coupling coefficient between the transmitting circuit and the receiving circuit
From the above analysis, the SS type electric field coupling wireless power transmission system based on the self-excited oscillation power supply of the present invention always works at the eigenfrequency under the condition of the change of the transmission distance, and the automatic adjustment of the frequency is realized. And in a certain distance range, the system can keep the output power and the transmission efficiency constant, and stable electric energy transmission is realized. Compared with the traditional electric field coupling wireless electric energy transmission system, the wireless electric energy transmission system has the advantages of simple structure, high response speed and various implementation methods, and is worthy of popularization.
The above-mentioned embodiments are merely preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, so that the changes in the shape and principle of the present invention should be covered within the protection scope of the present invention.
Claims (4)
1. SS type electric field coupling wireless power transmission system based on self-oscillation power supply, its characterized in that: the system comprises a self-oscillation power supply, a primary side resonator, a secondary side resonator, a coupling capacitor metal polar plate and a load RL(ii) a The primary side resonator comprises a primary side transmitting coil and a primary side resonant capacitor C which are connected in series1The primary side transmitting coil comprises a primary side inductor L connected in series1And internal resistance R of primary coil1The primary side resonance field of the primary side resonator has a resonance angular frequencyPrimary side internal resistance loss coefficient gamma1＝R1/2L1(ii) a The secondary resonator comprises a secondary receiving coil and a secondary resonant capacitor C connected in series2The secondary receiving coil comprises a secondary inductor L connected in series2And secondary coil internal resistance R2The secondary resonant field of the secondary resonator has a resonant angular frequencyAnd secondary side internal resistance loss coefficient gamma2＝R2/2L2(ii) a The coupling capacitor metal polar plate is connected with the primary side resonator and the secondary side resonator;
the self-excited oscillation power supply is connected with the primary side resonator, the angular frequency of the self-excited oscillation power supply is automatically adjusted along with the change of system parameters, and finally the angular frequency is stabilized at the intrinsic angular frequency of the system;
the load RLConnected with the secondary side resonator and corresponding to the load loss coefficient gamma in the resonance fieldL＝RL/2L2；
The primary and secondary resonators are coupled with each other by an electric field generated by a coupling capacitance metal plate between them.
2. A self-oscillating power supply based SS type electric field coupled wireless power transfer system according to claim 1, characterized in that: the intrinsic angular frequency of the system is determined by the primary internal resistance loss coefficient, the secondary internal resistance loss coefficient, the load loss coefficient, the electric field coupling coefficient and the intrinsic angular frequencies of the primary resonator and the secondary resonator.
3. A self-oscillating power supply based SS type electric field coupled wireless power transfer system according to claim 1, characterized in that: quality factor Q of the primary resonator1＝ω1/2Γ1At least more than 100, quality factor Q of the secondary resonator2＝ω2/2Γ2At least greater than 100.
4. A self-oscillating power supply based SS type electric field coupled wireless power transfer system according to claim 1, characterized in that: the coupling capacitance between the primary resonator and the secondary resonator is at least smaller than the primary resonance capacitance C1And secondary side resonance capacitor C2An order of magnitude.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102882290A (en) * | 2012-10-24 | 2013-01-16 | 天津工业大学 | Novel electromagnetic coupling resonant wireless power transmission system |
| CN103312051A (en) * | 2013-06-28 | 2013-09-18 | 华南理工大学 | System and method for achieving wireless power transmission through ferromagnetic resonance |
| CN203522342U (en) * | 2013-06-28 | 2014-04-02 | 华南理工大学 | System for achieving wireless power transmission through ferromagnetic resonance |
| CN207926289U (en) * | 2018-02-02 | 2018-09-28 | 华南理工大学 | SS type field coupling radio energy transmission systems based on self-oscillation power supply |
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- 2018-02-02 CN CN201810104443.3A patent/CN108321944B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102882290A (en) * | 2012-10-24 | 2013-01-16 | 天津工业大学 | Novel electromagnetic coupling resonant wireless power transmission system |
| CN103312051A (en) * | 2013-06-28 | 2013-09-18 | 华南理工大学 | System and method for achieving wireless power transmission through ferromagnetic resonance |
| CN203522342U (en) * | 2013-06-28 | 2014-04-02 | 华南理工大学 | System for achieving wireless power transmission through ferromagnetic resonance |
| CN207926289U (en) * | 2018-02-02 | 2018-09-28 | 华南理工大学 | SS type field coupling radio energy transmission systems based on self-oscillation power supply |
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