CN104377841B - A kind of load situation detection method of three-phase wireless power supply system - Google Patents
A kind of load situation detection method of three-phase wireless power supply system Download PDFInfo
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- CN104377841B CN104377841B CN201410655856.2A CN201410655856A CN104377841B CN 104377841 B CN104377841 B CN 104377841B CN 201410655856 A CN201410655856 A CN 201410655856A CN 104377841 B CN104377841 B CN 104377841B
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Abstract
A kind of three-phase wireless power supply system load situation detects and control method, belongs to the control method of wireless power supply system. This three-phase wireless power supply system comprises dc source, three phase combined inverter, former limit compensation mechanism, primary coil selector switch, former limit magnetic energy trigger mechanism, secondary magnetic energy mechanism for picking, secondary compensation mechanism, secondary current rectifying and wave filtering circuit and load; Former limit magnetic energy trigger mechanism forms primary coil array by 3n identical coil by honeycomb arrangement, secondary magnetic energy mechanism for picking comprises a pick-up winding, detect the position of secondary magnetic energy mechanism for picking in primary coil array according to load situation detection method, open one group of primary coil composition three-phase wireless power supply system by controlling primary coil selector switch accordingly, for load provides energy. Effect is: under the prerequisite that three-phase wireless power supply system is powered flexibly in proof load, meet reliable, the high efficiency power of load situation change at random system.
Description
Technical field
The present invention relates to a kind of control method of wireless power supply system, be specifically related to the load of a kind of three-phase wireless power supply systemPosition probing and control method.
Background technology
In daily life, desktop electrical equipment has brought many convenience for people live, as mobile phone, notebook computer, electricityDepending on machine etc. But existing electrical equipment is all to obtain electric energy by the combination of electric wire and plug at present, but establishes along with electricThe day by day pursuit of the standby increasing and mankind to convenient life, this traditional wired power supply mode exposes numerous fraudsEnd, the danger as numerous and diverse in contact sparking, cable, error shock easily occurs etc. Therefore, the radio energy based on induction coupling principle passesDefeated (WirelessPowerTransfer, WPT) technology is arisen at the historic moment. Desktop electrical equipment wireless power has solved tradition to be hadThe problem such as the contact sparking of line power supply mode, wearing and tearing, power cable are numerous and diverse, but for the load of desktop wireless power, as mouse, handMachines etc., due to the characteristics such as load putting position is uncertain, change in location randomness is large, therefore traditional desktop wireless power supply systemExist load situation to change the problems such as tolerance is low, power supplying efficiency is low.
For the uncertain feature of desktop wireless power supply system load situation, article " general non-contact power Platform DesigningAnd realize " in a kind of single-phase wireless power plateform system has been proposed, the former limit of this system adopts multiple circular coils to be laid in togetherForm general power supply platform, wireless power load placed just can be realized on power supply platform to the wireless transmission of energy. This systemAlthough can meet load in larger scope random mobile, the Distribution of Magnetic Field producing in space due to primary coilInhomogeneous, thus cause loading on the energy transmission efficiency difference of diverse location, once and load putting position in weak magneticPlace, to pick up efficiency will be very low to energy, even cannot meet the power reguirements of load; On the other hand, in article, do not haveSelect to open the primary coil of relevant position for the actual putting position of load, but take primary coil always in often openingState, therefore the waste of electric energy is more serious, and system effectiveness is lower; Article " PowerTransferStabilizationoftheThree-PhaseContactlessEnergyTransferDesktopbyMeansofCoilCommutation " a kind of three-phase wireless power plateform system of middle proposition, the former limit of this system comprises multiple magnetic energy trigger mechanisms, pairLimit comprises a mechanism for picking, and voltage pick-up " blind spot " problem that this system exists analyzed in article, and provide on this questionThe elimination way of voltage pick-up " blind spot ", but uncertain, the position of load situation existing for desktop wireless power supply system becomesChange the aspects such as randomness is large and do not provide corresponding solution.
Summary of the invention
The object of the invention is to exist load situation to change that tolerance is low, power supply effect for conventional desktop wireless power supply systemThe shortcomings such as rate is low, provide a kind of three-phase wireless power supply system load situation to detect and control method, the power supply that both can improve systemReliability and flexibility, high efficiency power that again can proof load.
The object of the present invention is achieved like this, the present invention includes three-phase wireless power supply system and load situation and detect and controlMethod processed, concrete scheme is as follows:
This three-phase wireless power supply system comprises: dc source, three phase combined inverter, former limit compensation mechanism, former sidelineCircle selector switch, former limit magnetic energy trigger mechanism, secondary magnetic energy mechanism for picking, secondary compensation mechanism, secondary current rectifying and wave filtering circuit withAnd load; Dc source is connected with the input of three phase combined inverter, the output of three phase combined inverter and former limitThe input of compensation mechanism connects, and the output of former limit compensation mechanism is connected with former limit magnetic energy trigger mechanism, at former limit compensation machineBetween structure and former limit magnetic energy trigger mechanism, be connected with primary coil selector switch; Former limit magnetic energy trigger mechanism and secondary magnetic energy pick upMechanism is coupled by electromagnetic induction principle, and secondary magnetic energy mechanism for picking is defeated by secondary compensation mechanism and secondary side rectification circuitEnter end and connect, the output of secondary side rectification circuit is connected with secondary filter circuit and load in parallel.
Described dc source can be obtained by industrial-frequency alternating current after rectifying and wave-filtering.
Described three phase combined inverter is made up of three star-like connections of single-phase bridge type inverter, high as the former limit of systemFrequently inverter.
Described former limit magnetic energy trigger mechanism is to be total to 3n identical regular hexagon coil by honeycomb arrangement by 3 groupsThe primary coil array of composition, three, arbitrary summit place coil is respectively from A, B, tri-different groups of C, and former limit in-phase coil is adoptedGet the structure of multiplexing inverter, former limit A, B, tri-groups of coils of C are connected with the three-phase output of three phase combined inverter respectively.
Described primary coil selector switch is connected with each primary coil, open-minded by this switch control primary coilWith shutoff.
Described secondary magnetic energy mechanism for picking only comprises a pick-up winding, and secondary current rectifying and wave filtering circuit adopts is with large electric capacityNot control rectifying circuit of the diode of filtering.
Described former limit compensation mechanism and the compensation way of secondary compensation mechanism all adopt series resonance compensation, and object isAvoid input DC power and resonance compensation electric capacity to be short-circuited and simplified the design of former and deputy limit compensation mechanism.
Described three phase combined inverter adopts Hysteresis Current Control Strategy respectively three single-phase inverters to be controlled separately,120 ° of given three-phase reference current amplitude equal phase mutual deviations, ensure three phase combined inverter output three-phase symmetrical.
In the magnetic energy trigger mechanism of described former limit, material, size, the number of turn, coil winding-direction, the inductance parameters of all coils are completeUnanimously.
Described load situation detection method: load situation detection algorithm is taking RF identification (RFID) technology as detection sideMethod, DSP is controller, by gating and the shutoff of primary coil selector switch control primary coil, its concrete detection method is:
1) in primary coil array, set up a plane right-angle coordinate, the position according to coil in coordinate system is to itEncode, its cryptoprinciple is: regulation initial point place coordinate is SC(0,0), establishing a certain C phase coil coordinate in coordinate system is SC(x，Y), be followed successively by from start to rotate a circle the in the direction of the clock coordinate of each coil of first coil directly over it: SA(x，y+1)、SB(x+1，y)、SA(x+1，y)、SB(x，y-1)、SA(x-1，y)、SB(x-1，y)；
2) at C phase coil center, all former limits pasting electronic label as rfid system responder, micro-in labelChip comprises C phase coil coordinate information, and at the inner RFID reader of installing of wireless power load, reader antenna is at secondary magnetic energyThe center of mechanism for picking;
3) in the time having wireless power load to be put on power supply platform, RFID reader receives induced field scope interior labelThe carrier signal that antenna is beamed back, is in harmonious proportion to encode by the solution to carrier signal signal is sent into dsp controller, obtains C in labelPhase coil coordinate information, in the time that RFID reader receives the carrier signal of sending from label antenna, the carrier wave letter receivingNumber number with secondary magnetic energy mechanism for picking occur coupling C phase coil number;
4) by encoder by the A of primary coil array, B, the corresponding primary coil selector switch of tri-groups of coils of C respectivelyConnect with general purpose I/O port of DSP, according to detected C phase coil quantity and coordinate information, control primary coil by DSPSelector switch is opened on a certain summit, load position place three coils as former limit magnetic energy transmitting coil.
Described primary coil selector switch control method is:
1) in the time of secondary magnetic energy mechanism for picking and a C phase coil generation coupling, the coordinate of establishing this C phase coil is SC(x，Y) the A phase coil coordinate that, now selection is opened is SA(x+1, y), B phase coil coordinate is SB(x+1, y), C phase coil coordinate is SC(x，y)；
2) in the time of secondary magnetic energy mechanism for picking and two C phase coils generation couplings, now can be divided into three kinds of situations:
(1) with secondary magnetic energy mechanism for picking occur coupling two C phase coil relative positions for obliquely, establishing coordinate is SC(x，y)、SC(x+1, y+1), now selecting the A phase coil coordinate of opening is SA(x, y+1), B phase coil coordinate is SB(x+1，y)，C phase coil coordinate is SC(x，y)；
(2) two C phase coil relative positions that coupling occur with secondary magnetic energy mechanism for picking are horizontal direction, establish coordinate and areSC(x，y)、SC(x+2, y), now selecting the A phase coil coordinate of opening is SA(x+1, y), B phase coil coordinate is SB(x+1，y)，C phase coil coordinate is SC(x，y)；
(3) with secondary magnetic energy mechanism for picking occur coupling two C phase coil relative positions be oblique under, establishing coordinate is SC(x，y)、SC(x+1, y-1), now selecting the A phase coil coordinate of opening is SA(x+1, y), B phase coil coordinate is SB(x，y-1)，C phase coil coordinate is SC(x，y)；
3) in the time of secondary magnetic energy mechanism for picking and three C phase coils generation couplings, now can be divided into two kinds of situations:
(1) three C phase coil relative positions that coupling occur with secondary magnetic energy mechanism for picking are inverted triangle, establish coordinate and areSC(x，y)、SC(x+2，y)、SC(x+1, y-1), now selecting the A phase coil coordinate of opening is SA(x+1, y), B phase coil coordinateFor SB(x+1, y), C phase coil coordinate is SC(x，y)；
(2) be positive triangle with three C phase coil relative positions of secondary magnetic energy mechanism for picking generation coupling, establishing coordinate is SC(x，y)、SC(x+2，y)、SC(x+1, y+1), now selecting the A phase coil coordinate of opening is SA(x+1, y), B phase coil coordinate isSB(x+1, y), C phase coil coordinate is SC(x，y)。
The control method that load situation detects: dc source produces three-phase high-frequency ac after by three phase combined inverterElectricity, according to the putting position loading in primary coil array, utilizes load situation detection method automatically to detect load situation,And control three coils that primary coil selector switch opens on a certain summit, load position place and launch as former limit magnetic energyCoil, inverter output high-frequency alternating current converts three-phase symmetrical high frequency sinusoidal ac to after the compensation mechanism of former limit, then passes throughThree of gating former limit magnetic energy transmitting coils are to spatial emission energy of electromagnetic field, and based on electromagnetic induction principle, secondary magnetic energy picks upGet mechanism and induce same frequency alternating current, after secondary compensation mechanism and secondary current rectifying and wave filtering circuit for load provides energy; ToolBody step is:
1) power-up initializing, system, in standby mode, is now controlled primary coil selector switch all in disconnecting shapeState, system energy consumption is very low.
2), in the time being placed with wireless power load on platform, detecting secondary magnetic energy by load situation detection algorithm and pick upThe position of mechanism in primary coil array, selects to open one group of primary coil composition three-phase wireless power system according to optimized algorithmSystem is load supplying.
3) system enters scan round state, judges whether the coordinate information that reader reads changes, thereby judges loadWhether position changes. If load situation changes, repeat above-mentioned (2) process, if again there is no load in detection platform,Return to (1) process, system reenters standby mode.
Beneficial effect, owing to having adopted such scheme, the design of three phase combined inverter makes former limit three-phase coilControl separately, simultaneously former limit magnetic energy trigger mechanism composition primary coil array and the series connection of each primary coil controlled and openedClose, can realize primary coil independent, freely switches, guarantee power supply reliability and flexibility, the while is detected based on load situationMethod and primary coil selector switch control method, select to open the primary coil composition three-phase wireless power that coupling efficiency is the highestSystem, has ensured the power supplying efficiency of load situation change at random system.
Advantage: based on the three-phase wireless power supply system of primary coil array and novel load position probing and control method,Power supply reliability is high, flexibility is strong and can realize the high efficiency power of load situation change at random system.
Brief description of the drawings
Fig. 1 is main circuit topological structure of the present invention.
Fig. 2 is primary coil array and corresponding coordinate information thereof.
Fig. 3 is that coupling schematic diagram occurs for secondary magnetic energy mechanism for picking and a C phase coil.
To be secondary magnetic energy mechanism for picking there are coupling schematic diagrames with two C phase coils obliquely to Fig. 4.
Fig. 5 is that coupling schematic diagram occurs for secondary magnetic energy mechanism for picking and two C phase coils of level.
Fig. 6 is that coupling schematic diagram occurs for secondary magnetic energy mechanism for picking and oblique lower two C phase coils.
Fig. 7 is secondary magnetic energy mechanism for picking and is three C phase coils generation coupling schematic diagrames of inverted triangle.
Fig. 8 is secondary magnetic energy mechanism for picking and is three C phase coils generation coupling schematic diagrames of positive triangle.
Fig. 9 is working-flow figure.
Figure 10 is former limit magnetic energy trigger mechanism output three-phase current wave simulation figure.
Figure 11 is secondary induced voltage, the current waveform analogous diagram after compensation.
Figure 12 is load end output dc voltage wave simulation figure.
In figure, 1, dc source; 2, three phase combined inverter; 3, former limit compensation mechanism; 4, primary coil selector switch;5, former limit magnetic energy trigger mechanism; 6, secondary magnetic energy mechanism for picking; 7, secondary compensation mechanism; 8, secondary side rectification circuit; 9, secondary filterWave circuit; 10, load.
Detailed description of the invention
Embodiment 1: the present invention includes a kind of three-phase wireless power supply system load situation and detect and control method, concrete schemeAs follows:
A kind of three-phase wireless power supply system, comprises dc source 1, three phase combined inverter 2, former limit compensation mechanism 3, formerSideline circle selector switch 4, former limit magnetic energy trigger mechanism 5, secondary magnetic energy mechanism for picking 6, secondary compensation mechanism 7, secondary rectified currentRoad 8, secondary filter circuit 9 and load 10; Dc source 1 is connected with the input of three phase combined inverter 2, three phase combinedThe output of inverter 2 is connected with the input of former limit compensation mechanism 3, and the output of former limit compensation mechanism 3 and former limit magnetic energy are sent outPenetrate mechanism 5 and connect, between former limit compensation mechanism 3 and former limit magnetic energy trigger mechanism 5, be connected with primary coil selector switch 4; FormerLimit magnetic energy trigger mechanism 5 is coupled with secondary magnetic energy mechanism for picking 6, secondary magnetic energy mechanism for picking 6 by secondary compensation mechanism 7 withThe input of secondary side rectification circuit 8 connects, the output of secondary side rectification circuit 8 and secondary filter circuit 9 and load 10 in parallelConnect.
Described dc source 1 can be obtained by industrial-frequency alternating current after rectifying and wave-filtering.
Described three phase combined inverter 2 is made up of three star-like connections of single-phase bridge type inverter, high as the former limit of systemFrequently inverter.
Described former limit magnetic energy trigger mechanism 5 is to be total to 3n identical regular hexagon coil by cellular row by 3 groupsThe primary coil array of row composition, three, arbitrary summit place coil is respectively from A, B, tri-different groups of C, former limit in-phase coilTake the structure of multiplexing inverter, former limit A, B, C group coil are connected with the three-phase output of three phase combined inverter 2 respectively; Institute3 groups that state is A group, B group and C group; Described 3n is A1～An，B1～Bn，C1～Cn, n is positive integer.
Described primary coil selector switch 4 is connected with each primary coil, by opening of this switch control primary coilLead to and turn-off; Described selector switch 4 is respectively KA1～KAn，KB1～KBn，KC1～KCn。
Described secondary magnetic energy mechanism for picking 6 only comprises a pick-up winding, and secondary side rectification circuit 8 adopts diode not controlRectification, filter circuit 9 is large capacitor filtering;
Described former limit compensation mechanism 3 and the compensation way of secondary compensation mechanism 7 all adopt series resonance compensation, and object existsIn avoiding input DC power and resonance compensation electric capacity to be short-circuited and having simplified the design of former and deputy limit compensation mechanism.
Described three phase combined inverter 2 adopts Hysteresis Current Control Strategy respectively three single-phase inverters to be controlled separatelySystem, 120 ° of given three-phase reference current amplitude equal phase mutual deviations, ensure that three phase combined inverter 2 exports three-phase symmetrical.
Material, size, the number of turn, coil winding-direction, the inductance parameters of each transmitting coil in the magnetic energy trigger mechanism 5 of described former limitIn full accord.
Fig. 1 is system main circuit topological structure, and three-phase wireless power supply system main circuit design method is ignored former limit magnetic energy and sent outThe switching loss of penetrating mutual inductance impact between mechanism and inverter switch device, the three phase combined inverter in former limit is regarded three lists asThe star-like combination of phase bridge-type inverter;
For not control rectifying circuit of single-phase full bridge, in the time adopting large capacitor filtering, see into from the AC of rectification circuitEquivalent load is:
ByCalculate secondary magnetic energy mechanism for picking 6 inductance value LsAs follows:
In formula, ω is the operating angle frequency of the three phase combined inverter 2 of system; QsFor secondary resonance compensation factor, QsGenerallyGet 2～10, otherwise can cause system unstable, occur many zero phases solution, also easily cause the sensitivity of system to electrical parameter.
By ω2LsCs=1 calculates the capacitance C of secondary compensation mechanism 7sAs follows:
According to system needs, establish former limit magnetic energy trigger mechanism 5 inductance value LpBe a fixed value, former limit compensation mechanism3 capacitances are as follows respectively:
M in formulaA、MB、MCBe respectively the mutual inductance between former limit A, B, C three-phase magnetic energy trigger mechanism and secondary magnetic energy mechanism for pickingValue.
Described load situation detection algorithm is using RF identification (RFID) technology as detection method, and DSP is controller, passes throughGating and the shutoff of primary coil selector switch control primary coil, its concrete detection method is:
1) Fig. 2 is the primary coil array schematic diagram that former limit magnetic energy trigger mechanism 5 forms. In primary coil array, set upA plane right-angle coordinate, encode to it in the position according to coil in coordinate system, and its cryptoprinciple is: regulation initial pointPlace's coordinate is SC(0,0), establishing a certain C phase coil coordinate in coordinate system is SC(x, y), from first coil directly over itThe coordinate of each coil of rotating a circle is in the direction of the clock followed successively by: SA(x，y+1)、SB(x+1，y)、SA(x+1，y)、SB(x，y-1)、SA(x-1，y)、SB(x-1，y)；
2) at C phase coil center, all former limits pasting electronic label as rfid system responder, micro-in labelChip comprises C phase coil coordinate information, and at the inner RFID reader of installing of wireless power load, reader antenna is at secondary magnetic energyThe center of mechanism for picking;
3) when having wireless power load placed on three-phase wireless power platform time, RFID reader receives induced fieldThe carrier signal that scope interior label antenna is beamed back, is in harmonious proportion to encode by the solution to carrier signal signal is sent into dsp controller, obtainsC phase coil coordinate information in label taking label, in the time that RFID reader receives the carrier signal of sending from label antenna, receivesCarrier signal number with secondary magnetic energy mechanism for picking occur coupling C phase coil number;
4) by encoder by the A of primary coil array, B, the corresponding primary coil selector switch of tri-groups of coils of C respectivelyConnect with general purpose I/O port of DSP, according to detected C phase coil quantity and coordinate information, control primary coil by DSPSelector switch is opened on a certain summit, load position place three coils as former limit magnetic energy transmitting coil.
Fig. 3～Fig. 8 is primary coil selector switch control method schematic diagram, according to the C phase coil quantity and the seat that detectMark information, can be divided into following 3 classes to the judgement of load situation:
1) in Fig. 3, secondary magnetic energy mechanism for picking 6 and a C phase coil are coupled, and the coordinate of establishing this C phase coil isSC(x, y), now selecting the A phase coil coordinate of opening is SA(x+1, y), the coordinate of B phase coil is SB(x+1, y), C phase coilCoordinate is SC(x，y)；
2) in the time of secondary magnetic energy mechanism for picking 6 and two C phase coils generation couplings, now can be divided into three kinds of situations:
(1), in Fig. 4, the relative position that two C phase coils of coupling occurs with secondary magnetic energy mechanism for picking 6 is obliqueUpper, establishing coordinate is SC(x，y)，SC(x+1, y+1), now selecting the A phase coil coordinate of opening is SA(x, y+1), B phase coil is satBe designated as SB(x+1, y), C phase coil coordinate is SC(x，y)；
(2), in Fig. 5, the relative position that two C phase coils of coupling occurs with secondary magnetic energy mechanism for picking 6 is level sideTo, establishing coordinate is SC(x，y)，SC(x+2, y), now selecting the A phase coil coordinate of opening is SA(x+1, y), B phase coil coordinateFor SB(x+1, y), C phase coil coordinate is SC(x，y)；
(3), in Fig. 6, the relative position that two C phase coils of coupling occurs with secondary magnetic energy mechanism for picking 6 is obliqueUnder, establishing coordinate is SC(x，y)、SC(x+1, y-1), now selecting the A phase coil coordinate of opening is SA(x+1, y), B phase coil is satBe designated as SB(x, y-1), C phase coil coordinate is SC(x，y)；
3) in the time of secondary magnetic energy mechanism for picking 6 and three C phase coils generation couplings, now can be divided into two kinds of situations:
(1), in Fig. 7, the relative position that three C phase coils of coupling occurs with secondary magnetic energy mechanism for picking 6 is down threeAngle, establishing coordinate is SC(x，y)、SC(x+2，y)、SC(x+1, y-1), now selecting the A phase coil coordinate of opening is SA(x+1，y)，B phase coil coordinate is SB(x+1, y), C phase coil coordinate is SC(x，y)；
(2), in Fig. 8, the relative position that three C phase coils of coupling occurs with secondary magnetic energy mechanism for picking 6 is positive threeAngle, establishing coordinate is SC(x，y)、SC(x+2，y)、SC(x+1, y+1), now selecting the A phase coil coordinate of opening is SA(x+1，y)，B phase coil coordinate is SB(x+1, y), C phase coil coordinate is SC(x，y)。
Fig. 9 is working-flow figure, the control method that load situation detects, and dc source is by three phase combined inversionAfter device, produce three-phase high-frequency alternating current, according to the putting position loading in primary coil array, utilize load situation detection sideMethod detects load situation automatically, and controls primary coil selector switch and open three on a certain summit, load position placeCoil is as former limit magnetic energy transmitting coil, and it is high that inverter output high-frequency alternating current converts three-phase symmetrical to after the compensation mechanism of former limitFrequently sinusoidal ac, then three former limit magnetic energy transmitting coils by gating are to spatial emission energy of electromagnetic field, based on electromagnetismPrinciple of induction, secondary magnetic energy mechanism for picking induces same frequency alternating current, through secondary compensation mechanism and secondary current rectifying and wave filtering circuitAfterwards for load provides energy; Concrete performing step is as follows:
1) after power-up initializing, system, in standby mode, is now controlled primary coil selector switch all in disconnecting shapeState, system energy consumption is very low;
2) when detecting while having wireless power load on the former limit of three-phase wireless power supply system power supply platform, pass through load situationDetection algorithm detects the position of secondary magnetic energy mechanism for picking in primary coil array, by controlling primary coil selector switchOpening one group of primary coil composition three-phase wireless power supply system, is load supplying;
3) system enters scan round state, judges whether the coordinate information that reader reads changes, thereby judges loadWhether position changes; If load situation changes, again detect the former limit magnetic energy transmitting coil that load situation backgating is suitableFor load supplying, if again there is no load in detection platform, system reenters standby mode.
The control method that the present invention proposes is passed through checking in software Matlab. Simulation parameter is as follows: dc sourceFor 140V, the reference current amplitude of three phase combined inverter 2 is 5A, and system works frequency is 20kHz, former limit magnetic energy emitterStructure 5 inductance value are 80 μ H, and former limit compensation mechanism 3 capacitances are respectively CA＝0.651μF、CB＝0.956μF、CC＝0.828μF，Mutual inductance value between former limit magnetic energy trigger mechanism and secondary magnetic energy mechanism for picking is MA＝24μH、MB＝15μH、MC=18 μ H, secondaryMagnetic energy mechanism for picking inductance value is 71.6 μ H, and secondary compensation mechanism capacitance is 0.884 μ F, and load resistance value is 5 Ω.
Figure 10 is the former limit magnetic energy transmitting coil two ends current waveform analogous diagram of system after resonance compensation, can from figureFind out that magnetic energy transmitting coil two ends, former limit current waveform approaches given reference current waveform, and waveform is sinusoidal wave.
Figure 11 is through the induced voltage of secondary compensation mechanism, current waveform analogous diagram, can find out output voltage, electric currentWaveform same-phase, output waveform harmonic content is less, and the efficiency of transmission of system is higher.
Figure 12 is load two ends output dc voltage wave simulation figure after rectifying and wave-filtering, and output waveform is after of short duration risingSubstantially be straight line, meet the power reguirements of load.
Claims (7)
1. a load situation detection method for three-phase wireless power supply system, is characterized in that: this three-phase wireless power supply system bagDraw together: dc source, three phase combined inverter, former limit compensation mechanism, primary coil selector switch, former limit magnetic energy trigger mechanism,Secondary magnetic energy mechanism for picking, secondary compensation mechanism, secondary current rectifying and wave filtering circuit and load; Dc source and three phase combined contraryThe input that becomes device connects, and the output of three phase combined inverter is connected with the input of former limit compensation mechanism, the compensation of former limitThe output of mechanism is connected with former limit magnetic energy trigger mechanism, between former limit compensation mechanism and former limit magnetic energy trigger mechanism, is connected withPrimary coil selector switch; Former limit magnetic energy trigger mechanism and secondary magnetic energy mechanism for picking are coupled by electromagnetic induction principle, pairLimit magnetic energy mechanism for picking is connected with the input of secondary side rectification circuit by secondary compensation mechanism, the output of secondary side rectification circuitBe connected with secondary filter circuit and load in parallel; Concrete grammar is:
Using RF identification (RFID) technology as detection method, DSP is controller, by the former limit of primary coil selector switch controlThe gating of coil and shutoff, its concrete detecting step is:
1) in primary coil array, set up a plane right-angle coordinate, carry out it the position according to coil in coordinate systemCoding, its cryptoprinciple is: regulation initial point place coordinate is SC(0,0), establishing a certain C phase coil coordinate in coordinate system is SC(x，y)，Be followed successively by from start to rotate a circle the in the direction of the clock coordinate of each coil of first coil directly over it: SA(x，y+1)、SB(x+1，y)、SA(x+1，y)、SB(x，y-1)、SA(x-1，y)、SB(x-1，y)；
2) at C phase coil center, all former limits pasting electronic label as rfid system responder, the microchip in labelComprise C phase coil coordinate information, at the inner RFID reader of installing of wireless power load, reader antenna picks up at secondary magnetic energyThe center of mechanism;
3) in the time having wireless power load to be put on three-phase wireless power platform, RFID reader receives within the scope of induced fieldThe carrier signal that label antenna is beamed back, sends signal into dsp controller by the solution mediation coding to carrier signal and obtains labelInterior C phase coil coordinate information, in the time that RFID reader receives the carrier signal of sending from label antenna, the carrier wave receivingThere is the C phase coil number of coupling with secondary magnetic energy mechanism for picking in the number of signal;
4) by encoder by the A of primary coil array, B, the corresponding primary coil selector switch of tri-groups of coils of C respectively withGeneral purpose I/O port of DSP connects, and according to detected C phase coil quantity and coordinate information, controls primary coil choosing by DSPSelect switch and open on a certain summit, load position place three coils as the former limit of system magnetic energy transmitting coil.
2. the load situation detection method of a kind of three-phase wireless power supply system according to claim 1, is characterized in that: instituteThe former limit magnetic energy trigger mechanism of stating is by 3 groups of former limits that the individual identical regular hexagon coil of 3n forms by honeycomb arrangement altogetherCoil array, three, arbitrary summit place coil is respectively from A, B, tri-different groups of C, former limit in-phase coil is taked multiplexing inversionThe structure of device, former limit A, B, tri-groups of coils of C are connected with the three-phase output of three phase combined inverter respectively.
3. the load situation detection method of a kind of three-phase wireless power supply system according to claim 1, is characterized in that: instituteThe primary coil selector switch of stating is connected with each primary coil, opening and turn-offing by this switch control primary coil.
4. the load situation detection method of a kind of three-phase wireless power supply system according to claim 1, is characterized in that: threeCombined formula inverter adopts Hysteresis Current Control Strategy respectively three single-phase inverters to be controlled separately, and given three-phase is with reference to electricity120 ° of stream amplitude equal phase mutual deviations, ensure three phase combined inverter output three-phase symmetrical.
5. the load situation detection method of a kind of three-phase wireless power supply system according to claim 1, is characterized in that: formerIn the magnetic energy trigger mechanism of limit, material, size, the number of turn, coil winding-direction, the inductance parameters of all coils are in full accord.
6. the load situation detection method of a kind of three-phase wireless power supply system according to claim 1, is characterized in that: formerSideline circle selector switch control method is:
A, in the time there is coupling in secondary magnetic energy mechanism for picking and C phase coil, the coordinate of establishing this C phase coil is SC(x, y), thisTime to select the A phase coil coordinate opened be SA(x, y+1), B phase coil coordinate is SB(x+1, y), C phase coil coordinate is SC(x，y)；
B, in the time there is coupling in secondary magnetic energy mechanism for picking and two C phase coils, now can be divided into three kinds of situations:
(1) with secondary magnetic energy mechanism for picking occur coupling two C phase coil relative positions for obliquely, establishing coordinate is SC(x，y)、SC(x+1, y+1), now selecting the A phase coil coordinate of opening is SA(x, y+1), B phase coil coordinate is SB(x+1, y), C phaseCoil coordinate is SC(x，y)；
(2) be horizontal direction with two C phase coil relative positions of secondary magnetic energy mechanism for picking generation coupling, establishing coordinate is SC(x，y)、SC(x+2, y), now selecting the A phase coil coordinate of opening is SA(x+1, y), B phase coil coordinate is SB(x+1, y), C phase lineCircle coordinate is SC(x，y)；
(3) with secondary magnetic energy mechanism for picking occur coupling two C phase coil relative positions be oblique under, establishing coordinate is SC(x，y)、SC(x+1, y-1), now selecting the A phase coil coordinate of opening is SA(x+1, y), B phase coil coordinate is SB(x, y-1), C phaseCoil coordinate is SC(x，y)；
C, in the time there is coupling in secondary magnetic energy mechanism for picking and three C phase coils, now can be divided into two kinds of situations:
(1) be inverted triangle with three C phase coil relative positions of secondary magnetic energy mechanism for picking generation coupling, establishing coordinate is SC(x，y)、SC(x+2，y)、SC(x+1, y-1), now selecting the A phase coil coordinate of opening is SA(x+1, y), B phase coil coordinate is SB(x+1, y), C phase coil coordinate is SC(x，y)；
(2) be positive triangle with three C phase coil relative positions of secondary magnetic energy mechanism for picking generation coupling, establishing coordinate is SC(x，y)、SC(x+2，y)、SC(x+1, y+1), now selecting the A phase coil coordinate of opening is SA(x+1, y), B phase coil coordinate is SB(x+1, y), C phase coil coordinate is SC(x，y)。
7. the load situation detection method of a kind of three-phase wireless power supply system according to claim 1, is characterized in that: toolBody control step is:
A, power-up initializing, system, in standby mode, is now controlled primary coil selector switch all in off-state, isSystem energy consumption is very low;
B, in the time being placed with wireless power load on the former limit of three-phase wireless power supply system power supply platform, detect calculation by load situationMethod detects the position of secondary magnetic energy mechanism for picking in primary coil array, opens certain by controlling primary coil selector switchOn one summit, three coil composition three-phase wireless power supply systems, are load supplying;
C, system enter scan round state, judge whether the coordinate information that reader reads changes, thereby judge load situationWhether change; If load situation changes, repeat above-mentioned b process, if again there is no load in detection platform, return to aProcess, system reenters standby mode.
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| CN105656214B (en) * | 2016-03-24 | 2018-11-16 | 湘潭大学 | A kind of multi-coil suitching type wireless power transmission coupling device and its control method |
| CN107370244A (en) * | 2017-06-26 | 2017-11-21 | 西安电子科技大学 | A kind of magnetic coil position detecting device and method for detecting position for induction wireless charging |
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