Magnetic resonance wireless electric energy transmission device based on PCB resonance coupling coil structuresTechnical field
The present invention relates to a kind of magnetic resonance wireless electric energy transmission device, more particularly to it is a kind of based on PCB resonance coupling coilsThe magnetic resonance wireless electric energy transmission device of structure.
Background technology
Traditional electric energy transmission is main to be connected by wire, in general rationally effectively.In recent years, with flat board electricityThe rise to mobile consumption electronic product of the electricity full of " hungering and thirst " such as brain, mobile communication, camera, research and development wireless charging etc. are broken throughThe demand of property charging technique is increasingly improved.
Wireless power transmission technology, was write by the Serbia descendants U.S. early in 1890 also known as contactless electrical energy transmission technologyName Electrical Engineer, physicist Ni Gula teslas propose.Using the alternating current impression skill of electromagnetic wave induction principle and correlationArt, sends and receives one that produces the AC signal for sensing to be charged end is sent and received with corresponding coilTechnology, according to the difference of electric energy transmission principle, wireless power transmission is divided into：Induction, electromagentic resonance formula and electromagnetic radiationFormula.
International wireless charging alliance issues Qi standards, the production and system to portable terminal charging equipment in July, 2010Making has carried out professional etiquette model, and its application is that induction wireless power transmission principle is powered.Initially sent out by a company of BritainUnderstand a kind of novel radio charger, it is looked just as one piece of plastics mouse pad, this " mouse pad " is inner equipped with intensive littleType coil array, can produce magnetic field, give the energy to the electronic equipment equipped with special receiving coil, be charged, and can be sameWhen give multiple equipment charge.Wireless power transmission technology is carried out using noncontact " electromagnetic induction " much to be limited.Such asThe position of Transformer Winding, the width of air gap so that magnetic field can with the increase of distance rapid decay.If increasing power supplyDistance, can only increase the intensity in magnetic field.However, the too big one side of magnetic field intensity can increase the consumption of electric energy, on the other hand mayThe equipment failure of record information can be caused nearby to come using magnetic signal.So its effective propagation path only has several centimetres, so thisPlant wireless power transmission and be only applicable to the transmission of short distance electric energy.
Electromagentic resonance formula wireless power transmission is proposed by the researcher of the Massachusetts Institute of Technology, is used with Qi standardsInduction transmission is different, and the transmission of electromagentic resonance formula to emission electromagnetic wave, and simply will not form a non-spoke aroundThe magnetic field penetrated, intensity are similar with earth magnetic field intensity, will not produce harmful effect, its effective transmission distance to human body and surrounding devicesFrom for tens centimetres to several meters, but whole electromagentic resonance formula transmitting device is worked under high frequency state, causes radio energyWhat is transmitted is less efficient.
The content of the invention
The technical problem to be solved in the present invention is, for the defect of existing electromagentic resonance Coil technique, there is provided Yi ZhongjiIn the magnetic resonance wireless electric energy transmission device of PCB resonance coupling coil structures, including
--- input power, with an output end,
--- high-frequency emission power supply, with an input and an output end；
--- electromagentic resonance coil, with an input and an output end；
--- rectification and load circuit；
One end of the input power connection input power load, the other end of the input power load connect the heightTake place frequently radio source input；
The output end of the high-frequency emission power supply connects the defeated of the electromagentic resonance coil by being input into series resonant capacitanceEnter end, the output end of the electromagentic resonance coil connects the rectification and load circuit by exporting series resonant capacitance；
The electromagentic resonance coil includes power coil, electromagentic resonance transmitting coil, electromagentic resonance receiving coil and loadCoil, between the power coil, the electromagentic resonance transmitting coil, the electromagentic resonance receiving coil and the loading coilFormation is of coupled connections, and the power coil connects the input series resonant capacitance, and the power coil is connected with the inputResonant capacitance forms input series resonance, and the loading coil connects the output series resonant capacitance, the loading coil withOutput series resonance is formed between the output series resonant capacitance.
The electromagentic resonance transmitting coil is identical with the electromagentic resonance receiving coil.
As further preferred embodiment, the power coil, the electromagentic resonance transmitting coil, the electromagentic resonanceReceiving coil adopts pcb board coil with the loading coil.
Used as further preferred embodiment, pcb board coil of the present invention includes pcb board and PCB coil, the PCBCoil is fixedly installed on the pcb board, and the PCB coil is provided with the second output end of the first output end of coil and coil.
Used as further preferred embodiment, the conductor width of PCB coil of the present invention is the PCB coil radius10%～15%.
Used as further preferred embodiment, the material of PCB coil of the present invention is copper cash.As further preferred realityApply scheme, pcb board coil of the pcb board coil of the present invention using individual layer PCB coil structure.
As further preferred embodiment, pcb board line of the pcb board coil of the present invention using N layer PCB coil structuresCircle, N >=2 and N≤6.
Used as further preferred embodiment, the pcb board coil of N layers PCB coil structure of the present invention is N number of individual layerPCB coil structure is in series by the first output end of the coil and the second output end of the coil.
Used as further preferred embodiment, electromagentic resonance transmitting coil of the present invention is open loop structure.Open loop structureElectromagentic resonance transmitting coil for individual layer PCB coil structure PCB coil or N layer PCB coil structures pcb board coil.
Used as further preferred embodiment, electromagentic resonance transmitting coil of the present invention is closed loop configuration.Closed loop configurationElectromagentic resonance transmitting coil for N layer PCB coil structures pcb board coil.
Used as further preferred embodiment, electromagentic resonance transmitting coil of the present invention is 3-6 layer PCB coil structuresPcb board coil.
Used as further preferred embodiment, electromagentic resonance transmitting coil of the present invention is 3 layers of PCB coil structurePcb board coil.
Beneficial effect：
Compared with prior art, the present invention has advantages below：
(1) electromagentic resonance transmitting coil is identical with electromagentic resonance receiving coil, and electromagentic resonance transmitting coil is in resonanceAttenuation rate of the attenuation rate, electromagentic resonance receiving coil in bandwidth frequency in resonance bandwidth frequency is reduced, and improves energyEfficiency of transmission.
(2) power coil, the electromagentic resonance transmitting coil, the electromagentic resonance receiving coil and the load lineCircle is pcb board coil, and pcb board coil has the advantages that noiseproof feature is strong, improves the stability of wireless power transmission
(3) the electromagentic resonance transmitting coil, electromagentic resonance receiving coil are open loop structure.The electromagentic resonance of open loop structureTransmitting coil, electromagentic resonance receiving coil circuit structure are simple, are not affected by external circuit connected mode, antijamming capability.
(4) the electromagentic resonance transmitting coil, electromagentic resonance receiving coil be closed loop configuration, the electromagentic resonance of closed loop configurationTransmitting coil, electromagentic resonance receiving coil, parasitic capacitance parameter stability, resonant frequency are low, it is possible to increase electromagentic resonance emission linesEnergy conversion efficiency between circle and electromagentic resonance receiving coil.
(5) conductor width of the PCB coil is the 10%～15% of the PCB coil radius.Using this kind of widthWire, can effectively reduce the capacitance of parasitic capacitance, reduce resonant frequency, improve electromagentic resonance transmitting coil and electromagentic resonanceEnergy conversion efficiency between receiving coil.
Description of the drawings
Fig. 1 is the circuit structure block diagram of the present invention；
Fig. 2 is electromagentic resonance coil circuit open loop structure schematic diagram of the present invention；
Fig. 3 is the structural representation of PCB construction individual layer PCB coil of the present invention；
Fig. 4 is the structural representation of PCB construction N layer PCB coils of the present invention；
Fig. 5 is the further optimization structural representation of PCB construction N layer PCB coils of the present invention；
Fig. 6 is electromagentic resonance coil circuit closed loop configuration schematic diagram of the present invention.
Specific embodiment
The invention will be further described with specific embodiment below in conjunction with the accompanying drawings, but not as limiting to the invention.
As shown in figure 1, the magnetic resonance wireless electric energy transmission device based on PCB resonance coupling coil structures, it is characterised in that：Including
--- input power 1, with an output end,
--- high-frequency emission power supply 3, with an input and an output end；
--- electromagentic resonance coil 5, with an input and an output end；
--- rectification and load circuit 7；
One end of the connection input power of the input power 1 load 2, the other end connection institute of the input power load 2State 3 input of high-frequency emission power supply；
The output end of the high-frequency emission power supply 3 connects the electromagentic resonance coil 5 by being input into series resonant capacitance 4Input, the output end of the electromagentic resonance coil 5 connect rectification and load circuit 7 by exporting series resonant capacitance 6；
As shown in Fig. 2 the electromagentic resonance coil 5 includes that power coil 8, electromagentic resonance transmitting coil 9, electromagentic resonance connectTake-up circle 10 and loading coil 11, the power coil 8, electromagentic resonance transmitting coil 9, electromagentic resonance receiving coil 10 and loadFormed between coil 11 and be of coupled connections, the power coil 8 connects the input series resonant capacitance 4, the power coil 8 withThe input series resonant capacitance 4 forms input series resonance, and the loading coil 11 connects the output series resonant capacitance6；Output series resonance is formed between the loading coil 11 and the output series resonant capacitance 6.
The electromagentic resonance transmitting coil 9 is identical with the electromagentic resonance receiving coil 10.
In the present invention, the coupled wave equation of magnetic resonance coil is as follows
Wherein, | α1(t)|2For the energy that electromagentic resonance transmitting coil under electromagentic resonance state sends；And α1(t)=A1e-jω1t, A1 be electromagentic resonance transmitting coil electromagenetic wave radiation range value, ω1Electromagentic resonance transmitting coil electromagenetic wave radiation frequency；
|α2(t)|2For under electromagentic resonance state electromagentic resonance receiving coil receive energy, andA2 isElectromagentic resonance receiving coil electromagenetic wave radiation range value, ω2For electromagentic resonance receiving coil electromagenetic wave radiation frequency；
Γ1It is attenuation rate of the electromagentic resonance transmitting coil in resonance bandwidth frequency；
Γ2It is attenuation rate of the electromagentic resonance receiving coil in resonance bandwidth frequency；
ΓlIt is load resonant bandwidth, its value is proportional to load admittance；
FsT () is resonance source forcing value；
kstFor resonance coupling coefficient.
As shown from the above formula, the electromagentic resonance transmitting coil 9 is identical with electromagentic resonance receiving coil 10, electromagnetismEjection values coil 9 is in the attenuation rate in resonance bandwidth frequency, the declining in resonance bandwidth frequency of electromagentic resonance receiving coil 10Lapse rate is reduced, and improves energy transmission efficiency.
It is as further preferred embodiment, power coil of the present invention 8, the electromagentic resonance transmitting coil 9, describedElectromagentic resonance receiving coil 10 adopts pcb board coil with the loading coil 11.Pcb board coil has noiseproof feature strongAdvantage, puies forward the stability of high energy transmission.
As shown in figure 3, used as further preferred embodiment, PCB construction of the present invention includes pcb board 12 and PCB linesCircle 13, the PCB coil 13 is fixedly installed with the pcb board 12, and the PCB coil 13 is provided with 14 He of the first output end of coilThe second output end of coil 15.
Used as further preferred embodiment, the conductor width of PCB coil of the present invention 13 is the PCB coil 13 halfThe 10%～15% of footpath.Using the wire of this kind of width, the capacitance of parasitic capacitance can be effectively reduced, reduce resonant frequency,Improve the energy conversion efficiency between electromagentic resonance transmitting coil 9, the electromagentic resonance receiving coil 10.
Used as further preferred embodiment, the material of PCB coil of the present invention is copper cash.
Used as further preferred embodiment, pcb board coil of the present invention can be the PCB of 13 structure of individual layer PCB coilBoard coil.The pcb board loop construction of 13 structure of individual layer PCB coil is simple, parasitic capacitance is little.
As shown in figure 4, used as further preferred embodiment, pcb board coil of the present invention can be N layers PCB coil 16The pcb board coil of structure, N >=2 and N≤6, reduce resonant frequency, improve energy transmission efficiency.
As shown in figure 5, as further preferred embodiment, the pcb board line of 16 structure of N layers PCB coil of the present inventionCircle is alternatively the pcb board coil of N number of 13 structure of individual layer PCB coil by the first output end of the coil 14 and the coil secondOutput end 15 is in series.
Used as further preferred embodiment, electromagentic resonance transmitting coil 9 of the present invention, the electromagentic resonance receive lineCircle 10 is open loop structure, and the electromagentic resonance transmitting coil 9 of open loop structure, the electromagentic resonance receiving coil 10 can be individual layer PCBThe pcb board coil of 16 structure of pcb board coil or N layers PCB coil of 13 structure of coil.The electromagentic resonance emission lines of open loop structureCircle, electromagentic resonance receiving coil simple structure, are not affected by external circuit connected mode, and anti-interference energy is strong.
As shown in fig. 6, as further preferred embodiment, electromagentic resonance transmitting coil 9 of the present invention, the electromagnetismResonance receiving coil 10 is closed loop configuration, and the electromagentic resonance transmitting coil 9 of closed loop configuration, the electromagentic resonance receiving coil 10 canFor the pcb board coil of 16 structure of N layers PCB coil, the electromagentic resonance transmitting coil 9 of closed loop configuration, electromagentic resonance receiving coil 10,Parasitic capacitance parameter stability, resonant frequency are low, it is possible to increase between electromagentic resonance transmitting coil 9 and electromagentic resonance receiving coil 10Energy conversion efficiency.
As further preferred embodiment, the electromagentic resonance transmitting coil 9 of closed loop configuration of the present invention, the electromagnetismPcb board coil of the resonance receiving coil 10 for 3-6 layer PCB coil structures.
As further preferred embodiment, the electromagentic resonance transmitting coil 9 of closed loop configuration of the present invention, the electricityPcb board coil of the magnetic resonance reception coil 10 for 3 layers of PCB coil structure.
Preferred embodiments of the present invention are the foregoing is only, embodiments of the present invention and protection model is not thereby limitedEnclose, to those skilled in the art, should can appreciate that done by all utilization description of the invention and diagramatic contentScheme obtained by equivalent and obvious change, should be included in protection scope of the present invention.