A kind of magnet coupled resonant type wireless power transfer of modified line coil structuresTechnical field
The present invention relates to a kind of wireless electric energy transmission device, especially a kind of magnet coupled resonant type wireless of modified line coil structuresPower transfer.
Background technique
With the development of wireless power transmission technology, more and more fields are needed using wireless power transmission technical transmissionElectric energy.There are mainly three types of current wireless power transmission technologies, is magnetic induction coupled modes, magnetic coupling resonance manner and micro- respectivelyWave radiation mode.For the application of low-power wireless electric energy transmission, compared to magnetic induction coupled modes, magnetic coupling resonance manner toolThere is longer effective propagation path, and compared with microwave radiation mode, there is higher efficiency of transmission.Although magnetic coupling resonance sideMore than formula has the advantages that, but its efficiency of transmission can change with the variation of distance, can not remain at very high level.
Theory analysis and it is demonstrated experimentally that the wireless power transmission based on magnet coupled resonant type wireless electric energy transmission technology fillsIt sets, according to the difference of loop construction, efficiency of transmission is also different with the variation tendency of transmission range.
The wireless electric energy transmission device of two loop constructions, efficiency of transmission reduce with the increase of transmission range；Work as transmissionWhen distance is greater than coil radius, efficiency of transmission is reduced rapidly.
The wireless electric energy transmission device of four loop constructions, efficiency of transmission reach when transmission range is equal to coil radiusMaximum value.When transmission range is less than coil radius, efficiency of transmission increases with the increase of transmission range；When transmission range is greater thanCoil radius is less than effective propagation path, the calculation formula of effective propagation path:When, transmission effectRate reduces with the increase of transmission range.
Two loop constructions employed in " research of the radio energy transmission system based on magnetic coupling resonance ", it is existing to askTopic is when wireless transmission distance is less than coil radius, and efficiency of transmission is relatively high, and wireless transmission distance is greater than coil radius, is less thanWhen coil diameter, efficiency of transmission is lower, and wireless transmission distance is greater than coil diameter, then efficiency of transmission is substantially zeroed." double relaying nothingsLine electric energy transmission system modeling with efficiency of transmission analyze " in use four loop constructions, the problem is that wireless transmission away fromWhen from being less than coil radius, efficiency of transmission is lower, and when wireless transmission distance is greater than coil, efficiency of transmission is significantly raised.
Summary of the invention
Above-mentioned for the magnet coupled resonant type wireless electric energy transmission technology of existing two loop construction and four loop constructions lacksIt falls into, the present invention provides a kind of magnet coupled resonant type wireless power transfer of modified line coil structures.
To achieve the above object, the present invention adopts the following technical scheme that.
A kind of magnet coupled resonant type wireless power transfer of modified line coil structures, including DC power supply are connected with height in turnFrequency inverter circuit, type transformer coil structure resonance coupling unit, high-frequency rectification circuit, inverter circuit and its load；It is characterized by: instituteState the wireless connection that type transformer coil structure resonance coupling unit is respectively arranged with two loop constructions and four loop constructions, two loop constructionsIt is equipped with transmitting coil in resonance coupling unit and receiving coil is resonance coil, when resonance coil is with identical hunting of frequency,Receiving coil is transferred energy to by coupling, realizes wireless power transmission；It is equipped with and drives in four loop construction resonance coupling unitsDynamic resonance coil, transmitting coil, receiving coil and load resonant coil are resonance coil, when resonance coil is shaken with identical frequencyWhen swinging, loading coil is transferred energy to by electromagnetic coupling, realizes wireless power transmission；And by being adopted in different transmission rangesWith different loop constructions, wireless electric energy transmission device efficiency of transmission is made to reach maximization.
The high-frequency inverter circuit is successively to be connected by choke induction, signal source, driving chip, switching tube with shunt capacitanceIt constitutes；The choke induction is to connect respectively with the input terminal of DC power output end and switching tube；The signal source and drivingThe connection of chip input terminal；The switching tube is connect with driving chip output end；The shunt capacitance is connect with paralleled power switches.
The type transformer coil structure resonance coupling unit is integrated by two loop constructions and four loop construction two parts；Two coilsStructure resonance coupling unit is integrated by launching circuit and reception circuit, and launching circuit and reception circuit are wirelessly connected；The hairBeing emitted back towards road includes transmitting coil and resonance capacitance group；The transmitting coil and capacitance group are connected in series；The reception circuit be byReceiving coil and resonant capacitance are connected in series and constitute；
Four loop construction resonance coupling units are by driving resonant tank, launching circuit, receive circuit and load resonant go back toRoad connects and composes；The driving resonant tank and launching circuit are wirelessly connected, and launching circuit and reception circuit are wirelessly connected, and are receivedCircuit and load circuit are wirelessly connected；The driving resonant tank includes driving coil and resonant capacitance, the driving coil andResonant capacitance is connected in series, and the launching circuit is connected in series by transmitting coil and resonant capacitance and is constituted, the reception circuitIncluding receiving coil and resonant capacitance, the receiving coil and resonant capacitance are connected in series, and the loaded resonant tank is by loadingCoil and resonant capacitance are connected in series and constitute.
The high-frequency rectification circuit is made of boost inductance, uncontrollable rectifier circuit and filter capacitor；The boost inductance withThe input terminal of uncontrollable rectifier circuit connects；The filter capacitor is connect with uncontrollable rectifier circuit in parallel；The uncontrollable rectifier circuitIt is made of four Schottky diodes.
The inverter circuit is connected and composed by boost inductance, full bridge inverter；The boost inductance and full-bridge invertingThe input terminal of circuit connects；The full bridge inverter includes four MOSFET pipes and four diodes, each MOSFET pipe pointIt is not connect with a diode inverse parallel.
The load is pure resistor load or impedance load.
For two loop constructions, wireless power transmission distance is transmitting coil and connects the wireless electric energy transmission deviceThe distance between take-up circle；For four loop constructions, wireless power transmission distance is driving resonance coil and loading coilThe distance between；When wireless power transmission distance is less than coil radius, using the magnet coupled resonant type wireless electricity of two loop constructionsIt can transmitting device.When wireless power transmission distance is greater than coil radius, is less than effective propagation path, using the magnetic of four loop constructionsCoupled resonance formula wireless electric energy transmission device.
A kind of magnet coupled resonant type wireless power transfer of modified line coil structures provided by the present invention is above-mentioned, sets respectivelyIt is equipped with the wireless connection of two loop construction resonance coupling units and four loop construction resonance coupling units, two loop construction resonance couplingsIt closes in part and passes through coupling when resonance coil is with identical hunting of frequency for resonance coil equipped with transmitting coil and receiving coilConjunction transfers energy to receiving coil, realizes wireless power transmission；Driving resonance is equipped in four loop construction resonance coupling unitsCoil, transmitting coil, receiving coil and load resonant coil are resonance coil, when resonance coil is with identical hunting of frequency,Loading coil is transferred energy to by electromagnetic coupling, realizes wireless power transmission；When wireless power transmission distance is less than coilWhen radius, using the magnet coupled resonant type wireless power transfer of two loop constructions；When wireless power transmission distance is greater than lineWhen enclosing radius, being less than effective propagation path, using the magnet coupled resonant type wireless power transfer of four loop constructions, byDifferent transmission ranges use different loop constructions, and wireless electric energy transmission device efficiency of transmission is made to reach maximization.
Apparatus of the present invention circuit structure is simple, realizes and is easy, at low cost, stable and reliable operation, uses valence with very highValue and economic benefits.
Detailed description of the invention
Fig. 1 is apparatus of the present invention theory structure block diagram.
Fig. 2 is apparatus of the present invention theory structure circuit diagram.
Fig. 3 is two coil principle structural circuit figures of the invention.
Fig. 4 is four coil principle structural circuit figures of the invention.
Fig. 5 is high-frequency inverter circuit driving of the present invention and on-off principle structural circuit figure.
Specific embodiment
Specific embodiments of the present invention are further illustrated below in conjunction with attached drawing.
Implement a kind of magnet coupled resonant type wireless power transfer of modified line coil structures, the wireless electric energy transmission deviceIncluding magnet coupled resonant type wireless power transfer by DC power supply, high-frequency inverter circuit, type transformer coil structure resonance coupling partPoint, high-frequency rectification circuit, inverter circuit and load composition.
The DC power supply is connect with high-frequency inverter circuit input terminal, the type transformer coil structure resonance coupling unit input terminalIt is connect with high-frequency inverter circuit output end, the type transformer coil structure resonance coupling unit output end and high-frequency rectification circuit input terminalConnection, the high-frequency rectification circuit output end are connect with inverter circuit input terminal.
The high-frequency inverter circuit is as shown in theory structure attached drawing 1, by choke induction, signal source, driving chip, switching tubeIt is formed with shunt capacitance；The choke induction is connect with the source electrode of DC power output end and switching tube respectively, the signal sourceIt is connect with driving chip input terminal, the switching tube is connect with driving chip output end, using UCC37325 as driving chipDriving switch pipe MOSFET, as shown in theory structure attached drawing 4, using the channel B for being suitable for N-channel MOS FET, channel B outputEnd is connect by flow-limiting voltage-stabilizing module with switch mosfet tube grid, and the shunt capacitance is in parallel with the source drain of switching tube to be connectedConnect so that switching tube meets Sofe Switch operating condition, shunt capacitance respectively with the launching circuit and four lines in two loop constructionsDriving circuit in coil structures is in parallel, so that direct current is transformed into high-frequency alternating current, prepares for next stage.
The resonance coupling unit is coupled as shown in theory structure attached drawing 2, attached drawing 3 and attached drawing 4 by two loop construction resonancePart and four loop construction resonance coupling unit two parts composition；
Two loop construction resonance coupling units are made of launching circuit and reception circuit, the launching circuit and reception circuitIt is wirelessly connected；The launching circuit includes transmitting coil and resonance capacitance group, and the transmitting coil and the series connection of resonance capacitance group connectConnect, the capacitance group is connected in series by three capacitors, it is described be received back routing receiving coil and resonant capacitance be connected in series；The series resonant tank of launching circuit resonant capacitance and transmitting coil composition generates resonance potential and resonance current, receives circuit and connectsTake-up circle and resonance capacitance group at series resonant tank there is resonance frequency identical with launching circuit, pass through magnetic coupling resonanceIt is transferred to energy from launching circuit and receives circuit, realize the wireless transmission of electric energy；
Four loop construction resonance coupling units are by driving resonant tank, launching circuit, reception circuit and loaded resonant tankComposition, the driving resonant tank and launching circuit are wirelessly connected, and launching circuit and are received circuit and are wirelessly connected, receive circuit withLoaded resonant tank is wirelessly connected；The driving resonant tank includes driving coil and resonant capacitance, and the driving coil is harmoniousThe capacitor that shakes is connected in series, and the launching circuit is connected in series by transmitting coil and resonant capacitance, and the reception circuit includesReceiving coil and resonant capacitance, the receiving coil and resonant capacitance are connected in series, and the loaded resonant tank is by loading coilIt is connected in series with resonant capacitance, drives the series resonant tank of resonant tank resonant capacitance and driving coil composition to generate humorousShake voltage and resonance current, and the series resonant tank of launching circuit resonant capacitance and transmitting coil composition receives circuit reception lineCircle and resonance capacitance group at series resonant tank and loaded resonant tank loading coil and resonance capacitance group at series connection it is humorousVibration circuit has and drives the identical resonance frequency of resonant tank, passes through energy from driving resonant tank by magnetic coupling resonanceLaunching circuit and reception circuit are transferred to loaded resonant tank, realize the wireless transmission of electric energy, to prepare in next step.
High-frequency rectification circuit is as shown in theory structure attached drawing 2, by boost inductance, uncontrollable rectifier circuit and filter capacitor groupAt；The boost inductance is connect with the input terminal of uncontrollable rectifier circuit, and the filter capacitor is connect with uncontrollable rectifier circuit in parallel；The uncontrollable rectifier circuit constitutes rectifier bridge by four Schottky diodes, by the uncontrollable rectifier being made of Schottky diodeThe high-frequency alternating current that wireless transmission obtains is transformed into direct current by circuit, is prepared for next stage.
Inverter circuit is made of as shown in theory structure attached drawing 2 boost inductance, full bridge inverter；The boost inductanceIt is connect with the input terminal of full bridge inverter；The full bridge inverter includes four MOSFET pipes and four diodes, eachMOSFET pipe is connect with a diode inverse parallel respectively, by the full-bridge inverting being made of MOSFET pipe and anti-paralleled diodeDirect current is transformed into industrial-frequency alternating current by circuit, further connects any power frequency load.
In above-mentioned specific embodiment, a kind of magnet coupled resonant type wireless electric energy transmission dress of different loop constructions is realizedThe specific works scheme set includes the following steps.
1) when wireless power transmission distance is less than coil radius, coupled resonance part uses two loop constructions.Specific sideMethod are as follows: switch S1Close the end a, a'End and a' 'End connection, g1End and g1'End connection, the end c and c'End connection, g2End and g2'End connection.
2) when wireless power transmission distance is greater than coil radius, coupled resonance part uses four loop constructions.Specific sideMethod are as follows: switch S1Close the end b, b'End and b' 'End connection, g1End and g1' 'End connection, the end d and d'End connection, g2End and g2' 'End connectsIt connects.
By using different loop constructions in different transmission ranges, wireless electric energy transmission device efficiency of transmission is made to reach maximumChange.
Apparatus of the present invention circuit structure is simple, realizes and is easy, at low cost, stable and reliable operation, uses valence with very highValue and economic benefits.
Above-described embodiment is merely a preferred embodiment of the present invention, and it is not intended to limit the protection scope of the present invention, as long as usingDesign principle of the invention, and the non-creative variation worked and made is carried out on this basis, it should belong to of the inventionWithin protection scope.