CN104377841A - Three-phase wireless power supply system load position detection and control method - Google Patents
Three-phase wireless power supply system load position detection and control method Download PDFInfo
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- CN104377841A CN104377841A CN201410655856.2A CN201410655856A CN104377841A CN 104377841 A CN104377841 A CN 104377841A CN 201410655856 A CN201410655856 A CN 201410655856A CN 104377841 A CN104377841 A CN 104377841A
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Abstract
The invention discloses a three-phase wireless power supply system load position detection and control method and relates to a control method for a wireless power supply system. A three-phase wireless power supply system comprises a direct current power source, a three-phase combined type inverter, a primary side compensation mechanism, a primary side coil selection switch, a primary side magnetic energy emission mechanism, a secondary side magnetic energy picking mechanism, a secondary side compensation mechanism, a secondary side rectification filter circuit and a load. The primary side magnetic energy emission mechanism is of a primary side coil array formed by arraying 3n identical coils in a honeycomb shape. The secondary side magnetic energy picking mechanism comprises a picking coil. The position of the secondary side magnetic energy picking mechanism in the primary side coil array is detected by the load position detection method. In this way, the primary side coil selection switch is controlled to switch on a set of primary side coils to form the three-phase wireless power supply system which supplies power to the load. The three-phase wireless power supply system load position detection and control method has the advantages that the three-phase wireless power supply system meets the requirement of reliably and efficiently supplying power to a load position random change system on the premise that flexible load power supply is ensured.
Description
Technical field
The present invention relates to a kind of control method of wireless power supply system, be specifically related to a kind of three-phase wireless power supply system load situation and detect and control method.
Background technology
In daily life, desktop electric equipment brings many convenience, as mobile phone, notebook computer, television set etc. for people live.But, existing electric equipment is all obtain electric energy by the compound mode of electric wire and plug at present, but along with the increasing of electric equipment and the mankind are to the pursuit day by day of convenient life, this traditional wired supply power mode exposes numerous drawbacks, as the danger etc. of contact sparking, numerous and diverse, the easy generation error shock of cable.Therefore, wireless power transmission (Wireless Power Transfer, the WPT) technology based on inductively principle is arisen at the historic moment.Desktop electric equipment wireless power solves the problems such as the contact sparking of traditional wire supply power mode, wearing and tearing, power cable be numerous and diverse, but for the load of desktop wireless power, as mouse, mobile phone etc., due to characteristics such as load putting position are uncertain, change in location randomness is large, there is the problems such as load situation change tolerance is low, power supplying efficiency is low in therefore traditional desktop wireless power supply system.
For the uncertain feature of desktop wireless power supply system load situation, a kind of single-phase wireless power plateform system is proposed in article " general non-contact power Platform Designing and realization ", the former limit of this system adopts multiple circular coil to be laid in form general power supply platform together, wireless power load is placed on the wireless transmission that power supply platform just can realize energy.Although this system can meet load movement at random in the larger context, but the Distribution of Magnetic Field produced in space due to primary coil is uneven, thus cause load different at the energy transmission efficiency of diverse location, and once load putting position is in low-intensity magnetic field district, then energy pickup efficiency will be very low, even cannot meet the power reguirements of load, on the other hand, do not select for the actual putting position of load the primary coil opening relevant position, but take primary coil to be in normally open always in article, therefore the waste of electric energy is comparatively serious, and system effectiveness is lower, in article " Power Transfer Stabilizationof the Three-Phase Contactless Energy Transfer Desktop by Means of CoilCommutation ", a kind of three-phase wireless power plateform system is proposed, the former limit of this system comprises multiple magnetic energy for emission mechanism, secondary comprises a mechanism for picking, article analyzes voltage pick-up " blind spot " problem that this system exists, and give the removing measures of voltage pick-up " blind spot " on this question, but the load situation existed for desktop wireless power supply system is uncertain, the aspects such as change in location randomness is large do not provide corresponding solution.
Summary of the invention
The object of the invention is to there is the shortcomings such as load situation change tolerance is low, power supplying efficiency is low for conventional desktop wireless power supply system, a kind of three-phase wireless power supply system load situation is provided to detect and control method, both power supply reliability and the flexibility of system can have been improved, again can the high efficiency power of proof load.
The object of the present invention is achieved like this, and the present invention includes three-phase wireless power supply system and load situation and detect and control method, concrete scheme is as follows:
This three-phase wireless power supply system comprises: DC power supply, three phase combined inverter, former limit compensation mechanism, primary coil selector switch, Yuan Bian magnetic energy for emission mechanism, secondary magnetic energy mechanism for picking, secondary compensation mechanism, secondary current rectifying and wave filtering circuit and load; DC power supply is connected with the input of three phase combined inverter, the output of three phase combined inverter is connected with the input of former limit compensation mechanism, the output of former limit compensation mechanism is connected with Yuan Bian magnetic energy for emission mechanism, between former limit compensation mechanism and Yuan Bian magnetic energy for emission mechanism, be connected with primary coil selector switch; Yuan Bian magnetic energy for emission mechanism and secondary magnetic energy mechanism for picking are coupled by electromagnetic induction principle, secondary magnetic energy mechanism for picking is connected with the input of secondary side rectification circuit by secondary compensation mechanism, and the output of secondary side rectification circuit is connected with secondary filter circuit in parallel and load.
Described DC power supply can be obtained after rectifying and wave-filtering by industrial-frequency alternating current.
Described three phase combined inverter is made up of three star-like connections of single-phase bridge type inverter, as system former limit high-frequency inverter.
The primary coil array that described Yuan Bian magnetic energy for emission mechanism is total to 3n identical regular hexagon coil forms by honeycomb arrangement by 3 groups, three, arbitrary summit place coil is respectively from the group that A, B, C tri-is different, former limit in-phase coil takes the structure of multiplexing inverter, and former limit A, B, C tri-groups of coils export with the three-phase of three phase combined inverter respectively and are connected.
Described primary coil selector switch is connected with each primary coil, opening and shutoff by this switch control rule primary coil.
Described secondary magnetic energy mechanism for picking only comprises a pick-up winding, and secondary current rectifying and wave filtering circuit adopts the diode uncontrollable rectifier circuit of band bulky capacitor filtering.
Described former limit compensation mechanism and the compensation way of secondary compensation mechanism all adopt series resonance to compensate, and object is to avoid input DC power and resonance compensation electric capacity are short-circuited and simplify the design of former and deputy limit compensation mechanism.
Described three phase combined inverter adopts Hysteresis Current Control Strategy to control separately three single-phase inverters respectively, given three-phase reference current amplitude equal phase mutual deviation 120 °, ensures that three phase combined inverter exports three-phase symmetrical.
The material of all coils in described Yuan Bian magnetic energy for emission mechanism, size, the number of turn, coil winding-direction, inductance parameters are completely the same.
Described load situation detection method: load situation detection algorithm is with radio-frequency (RF) identification (RFID) technology for detection method, and DSP is controller, controlled gating and the shutoff of primary coil by primary coil selector switch, its concrete detection method is:
1) in primary coil array, set up a plane right-angle coordinate, encode to it according to coil position in a coordinate system, its cryptoprinciple is: regulation initial point place coordinate is S
c(0,0), if a certain C phase coil coordinate is S in coordinate system
c(x, y), then the coordinate of each coil that rotates a circle in the direction of the clock from first coil directly over it is followed successively by: S
a(x, y+1), S
b(x+1, y), S
a(x+1, y), S
b(x, y-1), S
a(x-1, y), S
b(x-1, y);
2) at C phase coil center, all former limits pasting electronic label as rfid system transponder, microchip in label comprises C phase coil coordinate information, install RFID reader in wireless power load inside, reader antenna is in the center of secondary magnetic energy mechanism for picking;
3) when there being wireless power load to be put on power supply platform, RFID reader receives the carrier signal that induced field scope interior label antenna is beamed back, by being in harmonious proportion to encode to the solution of carrier signal, signal is sent into dsp controller, obtain C phase coil coordinate information in label, when RFID reader receives the carrier signal sent from label antenna, the C phase coil number that namely number of the carrier signal received is coupled with secondary magnetic energy mechanism for picking;
4) by encoder, the primary coil selector switch corresponding to A, B, C tri-groups of coils of primary coil array is connected with the general purpose I/O port of DSP respectively, according to detected C phase coil quantity and coordinate information, control primary coil selector switch by DSP and to open on a certain summit, load position place three coils as former limit magnetic energy for emission coil.
Described primary coil selector switch control method is:
1) when secondary magnetic energy mechanism for picking is coupled with a C phase coil, if the coordinate of this C phase coil is S
c(x, y), now selects the A phase coil coordinate opened to be S
a(x+1, y), B phase coil coordinate is S
b(x+1, y), C phase coil coordinate is S
c(x, y);
2) when secondary magnetic energy mechanism for picking is coupled with two C phase coils, three kinds of situations can be now divided into:
(1) two the C phase coil relative positions be coupled with secondary magnetic energy mechanism for picking are obliquely, if coordinate is S
c(x, y), S
c(x+1, y+1), now selects the A phase coil coordinate opened to be S
a(x, y+1), B phase coil coordinate is S
b(x+1, y), C phase coil coordinate is S
c(x, y);
(2) two the C phase coil relative positions be coupled with secondary magnetic energy mechanism for picking are horizontal direction, if coordinate is S
c(x, y), S
c(x+2, y), now selects the A phase coil coordinate opened to be S
a(x+1, y), B phase coil coordinate is S
b(x+1, y), C phase coil coordinate is S
c(x, y);
(3) two the C phase coil relative positions be coupled with secondary magnetic energy mechanism for picking are obliquely, if coordinate is S
c(x, y), S
c(x+1, y-1), now selects the A phase coil coordinate opened to be S
a(x+1, y), B phase coil coordinate is S
b(x, y-1), C phase coil coordinate is S
c(x, y);
3) when secondary magnetic energy mechanism for picking is coupled with three C phase coils, two kinds of situations can be now divided into:
(1) three the C phase coil relative positions be coupled with secondary magnetic energy mechanism for picking are inverted triangle, if coordinate is S
c(x, y), S
c(x+2, y), S
c(x+1, y-1), now selects the A phase coil coordinate opened to be S
a(x+1, y), B phase coil coordinate is S
b(x+1, y), C phase coil coordinate is S
c(x, y);
(2) three the C phase coil relative positions be coupled with secondary magnetic energy mechanism for picking are positive triangle, if coordinate is S
c(x, y), S
c(x+2, y), S
c(x+1, y+1), now selects the A phase coil coordinate opened to be S
a(x+1, y), B phase coil coordinate is S
b(x+1, y), C phase coil coordinate is S
c(x, y).
The control method that load situation detects: DC power supply is by producing three-phase high-frequency alternating current after three phase combined inverter, according to the putting position of load in primary coil array, load situation detection method is utilized automatically to detect load situation, and control primary coil selector switch and open three coils on a certain summit, load position place as former limit magnetic energy for emission coil, inverter exports high-frequency alternating current and convert three-phase symmetrical high frequency sinusoidal alternating current to after the compensation mechanism of former limit, pass through three former limit magnetic energy for emission coils of gating again to spatial emission energy of electromagnetic field, based on electromagnetic induction principle, secondary magnetic energy mechanism for picking induces same frequency alternating current, for load provides energy after secondary compensation mechanism and secondary current rectifying and wave filtering circuit, concrete steps are:
1) power-up initializing, system is in standby mode, and now control primary coil selector switch and be all in off-state, system energy consumption is very low.
2) when platform being placed with wireless power load, the position of secondary magnetic energy mechanism for picking in primary coil array is detected by load situation detection algorithm, selecting to open one group of primary coil composition three-phase wireless power supply system according to optimized algorithm, is load supplying.
3) system enters scan round state, judges whether the coordinate information that reader reads changes, thus judges whether load situation changes.If load situation changes, repeat above-mentioned (2) process, if again detection platform does not have load, return (1) process, system reenters standby mode.
Beneficial effect, owing to have employed such scheme, the design of three phase combined inverter makes the control of former limit three-phase coil separate, Yuan Bian magnetic energy for emission mechanism forms primary coil array and each primary coil series connection control switch simultaneously, can realize primary coil independent, freely switch, ensure power supply reliability and flexibility, simultaneously based on load situation detection method and primary coil selector switch control method, select to open the highest primary coil composition three-phase wireless power supply system of coupling efficiency, ensure that 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.
Accompanying drawing explanation
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 secondary magnetic energy mechanism for picking is coupled with a C phase coil schematic diagram.
Fig. 4 to be secondary magnetic energy mechanism for picking with two C phase coils be obliquely coupled schematic diagram.
Fig. 5 is that secondary magnetic energy mechanism for picking and level two C phase coils are coupled schematic diagram.
Fig. 6 to be secondary magnetic energy mechanism for picking with two C phase coils be obliquely coupled schematic diagram.
Fig. 7 to be secondary magnetic energy mechanism for picking with in inverted triangle three C phase coils be coupled schematic diagram.
Fig. 8 to be secondary magnetic energy mechanism for picking with in positive triangle three C phase coils be coupled schematic diagram.
Fig. 9 is working-flow figure.
Figure 10 Shi Yuanbian magnetic energy for emission mechanism exports three-phase current wave simulation figure.
Figure 11 is secondary induced voltage, current waveform analogous diagram after compensating.
Figure 12 is load end output dc voltage wave simulation figure.
In figure, 1, DC power supply; 2, three phase combined inverter; 3, former limit compensation mechanism; 4, primary coil selector switch; 5, Yuan Bian magnetic energy for emission mechanism; 6, secondary magnetic energy mechanism for picking; 7, secondary compensation mechanism; 8, secondary side rectification circuit; 9, secondary filter circuit; 10, load.
Embodiment
Embodiment 1: the present invention includes a kind of three-phase wireless power supply system load situation and detect and control method, concrete scheme is as follows:
A kind of three-phase wireless power supply system, comprises DC power supply 1, three phase combined inverter 2, former limit compensation mechanism 3, primary coil selector switch 4, Yuan Bian magnetic energy for emission mechanism 5, secondary magnetic energy mechanism for picking 6, secondary compensation mechanism 7, secondary side rectification circuit 8, secondary filter circuit 9 and load 10; DC power supply 1 is connected with the input of three phase combined inverter 2, the output of three phase combined inverter 2 is connected with the input of former limit compensation mechanism 3, the output of former limit compensation mechanism 3 is connected with Yuan Bian magnetic energy for emission mechanism 5, between former limit compensation mechanism 3 and Yuan Bian magnetic energy for emission mechanism 5, be connected with primary coil selector switch 4; Yuan Bian magnetic energy for emission mechanism 5 and secondary magnetic energy mechanism for picking 6 are coupled, secondary magnetic energy mechanism for picking 6 is connected with the input of secondary side rectification circuit 8 by secondary compensation mechanism 7, and the output of secondary side rectification circuit 8 is connected with secondary filter circuit 9 in parallel and load 10.
Described DC power supply 1 can be obtained after rectifying and wave-filtering by industrial-frequency alternating current.
Described three phase combined inverter 2 is made up of three star-like connections of single-phase bridge type inverter, as system former limit high-frequency inverter.
The primary coil array that described Yuan Bian magnetic energy for emission mechanism 5 is total to 3n identical regular hexagon coil forms by honeycomb arrangement by 3 groups, three, arbitrary summit place coil is respectively from the group that A, B, C tri-is different, former limit in-phase coil takes the structure of multiplexing inverter, and former limit A, B, C group coil exports with the three-phase of three phase combined inverter 2 respectively and is connected; Described 3 groups is A group, B group and C group; Described 3n is A
1~ A
n, B
1~ B
n, C
1~ C
n, n is positive integer.
Described primary coil selector switch 4 is connected with each primary coil, opening and shutoff by this switch control rule primary coil; Described selector switch 4 is respectively K
a1~ K
an, K
b1~ K
bn, K
c1~ K
cn.
Described secondary magnetic energy mechanism for picking 6 only comprises a pick-up winding, and secondary side rectification circuit 8 adopts diode uncontrollable rectifier, and filter circuit 9 is bulky capacitor filtering;
Described former limit compensation mechanism 3 and the compensation way of secondary compensation mechanism 7 all adopt series resonance to compensate, and object is to avoid input DC power and resonance compensation electric capacity are short-circuited and simplify the design of former and deputy limit compensation mechanism.
Described three phase combined inverter 2 adopts Hysteresis Current Control Strategy to control separately three single-phase inverters respectively, and given three-phase reference current amplitude equal phase mutual deviation 120 °, ensures that three phase combined inverter 2 exports three-phase symmetrical.
The material of each transmitting coil in described Yuan Bian magnetic energy for emission mechanism 5, size, the number of turn, coil winding-direction, inductance parameters are completely the same.
Fig. 1 is system main circuit topological structure, three-phase wireless power supply system main circuit design method, ignore the switching loss of mutual inductance impact and inverter switch device between Yuan Bian magnetic energy for emission mechanism, the star-like combination of three single-phase bridge type inverters regarded as by the three phase combined inverter in former limit;
For single-phase full bridge uncontrollable rectifier circuit, when adopting bulky capacitor filtering, equivalent load of entering viewed from the AC of rectification circuit is:
By
calculate secondary magnetic energy mechanism for picking 6 inductance value L
sas follows:
In formula, ω is the operating angle frequency of the three phase combined inverter 2 of system; Q
sfor secondary resonance compensation factor, Q
sgenerally get 2 ~ 10, otherwise system can be caused unstable, occur many zero phases solution, also easily cause system to the sensitivity of electrical parameter.
By ω
2l
sc
s=1 capacitance C calculating secondary compensation mechanism 7
sas follows:
According to system needs, if Yuan Bian magnetic energy for emission mechanism 5 inductance value L
pbe a fixed value, then compensation mechanism 3 capacitance in former limit is as follows respectively:
M in formula
a, M
b, M
cbe respectively the mutual inductance value between former limit A, B, C three-phase magnetic energy for emission mechanism and secondary magnetic energy mechanism for picking.
Described load situation detection algorithm is using radio-frequency (RF) identification (RFID) technology as detection method, and DSP is controller, and controlled gating and the shutoff of primary coil by primary coil selector switch, its concrete detection method is:
1) Fig. 2 is the primary coil array schematic diagram of Yuan Bian magnetic energy for emission mechanism 5 composition.In primary coil array, set up a plane right-angle coordinate, encode to it according to coil position in a coordinate system, its cryptoprinciple is: regulation initial point place coordinate is S
c(0,0), if a certain C phase coil coordinate is S in coordinate system
c(x, y), then the coordinate of each coil that rotates a circle in the direction of the clock from first coil directly over it is followed successively by: S
a(x, y+1), S
b(x+1, y), S
a(x+1, y), S
b(x, y-1), S
a(x-1, y), S
b(x-1, y);
2) at C phase coil center, all former limits pasting electronic label as rfid system transponder, microchip in label comprises C phase coil coordinate information, install RFID reader in wireless power load inside, reader antenna is in the center of secondary magnetic energy mechanism for picking;
3) when there being wireless power load to be placed on three-phase wireless power platform, RFID reader receives the carrier signal that induced field scope interior label antenna is beamed back, by being in harmonious proportion to encode to the solution of carrier signal, signal is sent into dsp controller, obtain C phase coil coordinate information in label, when RFID reader receives the carrier signal sent from label antenna, the C phase coil number that namely number of the carrier signal received is coupled with secondary magnetic energy mechanism for picking;
4) by encoder, the primary coil selector switch corresponding to A, B, C tri-groups of coils of primary coil array is connected with the general purpose I/O port of DSP respectively, according to detected C phase coil quantity and coordinate information, control primary coil selector switch by DSP and to open on a certain summit, load position place three coils as former limit magnetic energy for emission coil.
Fig. 3 ~ Fig. 8 is primary coil selector switch control method schematic diagram, according to the C phase coil quantity detected and coordinate information, can be divided into following 3 classes to the judgement of load situation:
1) in figure 3, secondary magnetic energy mechanism for picking 6 is coupled with a C phase coil, if the coordinate of this C phase coil is S
c(x, y), now selects the A phase coil coordinate opened to be S
a(x+1, y), the coordinate of B phase coil is S
b(x+1, y), C phase coil coordinate is S
c(x, y);
2) when secondary magnetic energy mechanism for picking 6 is coupled with two C phase coils, three kinds of situations can be now divided into:
(1) in the diagram, the relative position of two the C phase coils be coupled with secondary magnetic energy mechanism for picking 6 is obliquely, if coordinate is S
c(x, y), S
c(x+1, y+1), now selects the A phase coil coordinate opened to be S
a(x, y+1), B phase coil coordinate is S
b(x+1, y), C phase coil coordinate is S
c(x, y);
(2) in Figure 5, the relative position of two the C phase coils be coupled with secondary magnetic energy mechanism for picking 6 is horizontal direction, if coordinate is S
c(x, y), S
c(x+2, y), now selects the A phase coil coordinate opened to be S
a(x+1, y), B phase coil coordinate is S
b(x+1, y), C phase coil coordinate is S
c(x, y);
(3) in figure 6, the relative position of two the C phase coils be coupled with secondary magnetic energy mechanism for picking 6 is obliquely, if coordinate is S
c(x, y), S
c(x+1, y-1), now selects the A phase coil coordinate opened to be S
a(x+1, y), B phase coil coordinate is S
b(x, y-1), C phase coil coordinate is S
c(x, y);
3) when secondary magnetic energy mechanism for picking 6 is coupled with three C phase coils, two kinds of situations can be now divided into:
(1) in the figure 7, the relative position of three the C phase coils be coupled with secondary magnetic energy mechanism for picking 6 is inverted triangle, if coordinate is S
c(x, y), S
c(x+2, y), S
c(x+1, y-1), now selects the A phase coil coordinate opened to be S
a(x+1, y), B phase coil coordinate is S
b(x+1, y), C phase coil coordinate is S
c(x, y);
(2) in fig. 8, the relative position of three the C phase coils be coupled with secondary magnetic energy mechanism for picking 6 is positive triangle, if coordinate is S
c(x, y), S
c(x+2, y), S
c(x+1, y+1), now selects the A phase coil coordinate opened to be S
a(x+1, y), B phase coil coordinate is S
b(x+1, y), C phase coil coordinate is S
c(x, y).
Fig. 9 is working-flow figure, the control method that load situation detects, DC power supply is by producing three-phase high-frequency alternating current after three phase combined inverter, according to the putting position of load in primary coil array, load situation detection method is utilized automatically to detect load situation, and control primary coil selector switch and open three coils on a certain summit, load position place as former limit magnetic energy for emission coil, inverter exports high-frequency alternating current and convert three-phase symmetrical high frequency sinusoidal alternating current to after the compensation mechanism of former limit, pass through three former limit magnetic energy for emission coils of gating again to spatial emission energy of electromagnetic field, based on electromagnetic induction principle, secondary magnetic energy mechanism for picking induces same frequency alternating current, for load provides energy after secondary compensation mechanism and secondary current rectifying and wave filtering circuit, concrete performing step is as follows:
1) after power-up initializing, system is in standby mode, and now control primary coil selector switch and be all in off-state, system energy consumption is very low;
2) when detect the former limit of three-phase wireless power supply system power platform has wireless power load time, the position of secondary magnetic energy mechanism for picking in primary coil array is detected by load situation detection algorithm, opening one group of primary coil composition three-phase wireless power supply system by controlling primary coil selector switch, is load supplying;
3) system enters scan round state, judges whether the coordinate information that reader reads changes, thus judges whether load situation changes; If load situation changes, the former limit magnetic energy for emission coil again detecting load situation backgating suitable is load supplying, if again detection platform does not have load, then system reenters standby mode.
The control method that the present invention proposes passes through checking in software Matlab.Simulation parameter is as follows: DC power supply is 140V, and the reference current amplitude of three phase combined inverter 2 is 5A, and system operating frequency is 20kHz, Yuan Bian magnetic energy for emission mechanism 5 inductance value is 80 μ H, and former limit compensation mechanism 3 capacitance is respectively C
a=0.651 μ F, C
b=0.956 μ F, C
c=0.828 μ F, the mutual inductance value between Yuan Bian magnetic energy for emission mechanism and secondary magnetic energy mechanism for picking is M
a=24 μ H, M
b=15 μ H, M
c=18 μ H, secondary magnetic energy mechanism for picking inductance value is 71.6 μ H, and secondary compensation mechanism capacitance is 0.884 μ F, and load resistor value is 5 Ω.
Figure 10 is the former limit magnetic energy for emission coil two ends current waveform analogous diagram of system after resonance compensation, and as can be seen from the figure magnetic energy for emission coil two ends, former limit current waveform is close to given reference current waveform, and waveform is in sinusoidal wave.
Figure 11 is induced voltage, current waveform analogous diagram through secondary compensation mechanism, and can find out output voltage, current waveform 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 basic in straight line after of short duration rising, meets the power reguirements of load
Claims (10)
1. a three-phase wireless power supply system, is characterized in that: this three-phase wireless power supply system comprises: DC power supply, three phase combined inverter, former limit compensation mechanism, primary coil selector switch, Yuan Bian magnetic energy for emission mechanism, secondary magnetic energy mechanism for picking, secondary compensation mechanism, secondary current rectifying and wave filtering circuit and load; DC power supply is connected with the input of three phase combined inverter, the output of three phase combined inverter is connected with the input of former limit compensation mechanism, the output of former limit compensation mechanism is connected with Yuan Bian magnetic energy for emission mechanism, between former limit compensation mechanism and Yuan Bian magnetic energy for emission mechanism, be connected with primary coil selector switch; Yuan Bian magnetic energy for emission mechanism and secondary magnetic energy mechanism for picking are coupled by electromagnetic induction principle, secondary magnetic energy mechanism for picking is connected with the input of secondary side rectification circuit by secondary compensation mechanism, and the output of secondary side rectification circuit is connected with secondary filter circuit in parallel and load.
2. a kind of three-phase wireless power supply system according to claim 1, is characterized in that: described Yuan Bian magnetic energy for emission mechanism is by 3 groups totally 3
nindividual identical regular hexagon coil is by the primary coil array of honeycomb arrangement composition, three, arbitrary summit place coil is respectively from the group that A, B, C tri-is different, former limit in-phase coil takes the structure of multiplexing inverter, and former limit A, B, C tri-groups of coils export with the three-phase of three phase combined inverter respectively and are connected.
3. a kind of three-phase wireless power supply system according to claim 1, is characterized in that: described primary coil selector switch is connected with each primary coil, opening and shutoff by this switch control rule primary coil.
4. a kind of three-phase wireless power supply system according to claim 1, is characterized in that: described secondary magnetic energy mechanism for picking only comprises a pick-up winding, and secondary current rectifying and wave filtering circuit adopts the diode uncontrollable rectifier circuit of band bulky capacitor filtering.
5. a kind of three-phase wireless power supply system according to claim 1, is characterized in that: described former limit compensation mechanism and the compensation way of secondary compensation mechanism all adopt series resonance to compensate, and avoids input DC power and resonance compensation electric capacity to be short-circuited.
6. a kind of three-phase wireless power supply system according to claim 1, it is characterized in that: three phase combined inverter adopts Hysteresis Current Control Strategy to control separately three single-phase inverters respectively, given three-phase reference current amplitude equal phase mutual deviation 120 °, ensures that three phase combined inverter exports three-phase symmetrical.
7. a kind of three-phase wireless power supply system according to claim 1, is characterized in that: the material of all coils in Yuan Bian magnetic energy for emission mechanism, size, the number of turn, coil winding-direction, inductance parameters are completely the same.
8. the load situation detection method of a kind of three-phase wireless power supply system according to claim 1, it is characterized in that: using radio-frequency (RF) identification (RFID) technology as detection method, DSP is controller, and controlled gating and the shutoff of primary coil by primary coil selector switch, its concrete detection method is:
1) in primary coil array, set up a plane right-angle coordinate, encode to it according to coil position in a coordinate system, its cryptoprinciple is: regulation initial point place coordinate is S
c(0,0), if a certain C phase coil coordinate is S in coordinate system
c(
x,
y), then the coordinate of each coil that rotates a circle in the direction of the clock from first coil directly over it is followed successively by: S
a(
x,
y+ 1), S
b(
x+ 1,
y), S
a(
x+ 1,
y), S
b(
x,
y-1), S
a(
x-1,
y), S
b(
x-1,
y);
2) at C phase coil center, all former limits pasting electronic label as rfid system transponder, microchip in label comprises C phase coil coordinate information, install RFID reader in wireless power load inside, reader antenna is in the center of secondary magnetic energy mechanism for picking;
3) when there being wireless power load to be put on three-phase wireless power platform, RFID reader receives the carrier signal that induced field scope interior label antenna is beamed back, C phase coil coordinate information in label is obtained by signal being sent into dsp controller to the solution mediation coding of carrier signal, when RFID reader receives the carrier signal sent from label antenna, the C phase coil number that namely number of the carrier signal received is coupled with secondary magnetic energy mechanism for picking;
4) by encoder, the primary coil selector switch corresponding to A, B, C tri-groups of coils of primary coil array is connected with the general purpose I/O port of DSP respectively, according to detected C phase coil quantity and coordinate information, control primary coil selector switch by DSP and to open on a certain summit, load position place three coils as system former limit magnetic energy for emission coil.
9. the load situation detection method of three-phase wireless power supply system according to claim 4, is characterized in that: its primary coil selector switch control method is:
1) when secondary magnetic energy mechanism for picking is coupled with a C phase coil, if the coordinate of this C phase coil is S
c(
x,
y), now select the A phase coil coordinate opened to be S
a(
x+ 1,
y), B phase coil coordinate is S
b(
x+ 1,
y), C phase coil coordinate is S
c(
x,
y);
2) when secondary magnetic energy mechanism for picking is coupled with two C phase coils, three kinds of situations can be now divided into:
(1) two the C phase coil relative positions be coupled with secondary magnetic energy mechanism for picking are obliquely, if coordinate is S
c(
x,
y), S
c(
x+ 1,
y+ 1) the A phase coil coordinate, now selecting to open is S
a(
x,
y+ 1), B phase coil coordinate is S
b(
x+ 1,
y), C phase coil coordinate is S
c(
x,
y);
(2) two the C phase coil relative positions be coupled with secondary magnetic energy mechanism for picking are horizontal direction, if coordinate is S
c(
x,
y), S
c(
x+ 2,
y), now select the A phase coil coordinate opened to be S
a(
x+ 1,
y), B phase coil coordinate is S
b(
x+ 1,
y), C phase coil coordinate is S
c(
x,
y);
(3) two the C phase coil relative positions be coupled with secondary magnetic energy mechanism for picking are obliquely, if coordinate is S
c(
x,
y), S
c(
x+ 1,
y-1) the A phase coil coordinate, now selecting to open is S
a(
x+ 1,
y), B phase coil coordinate is S
b(
x,
y-1), C phase coil coordinate is S
c(
x,
y);
3) when secondary magnetic energy mechanism for picking is coupled with three C phase coils, two kinds of situations can be now divided into:
(1) three the C phase coil relative positions be coupled with secondary magnetic energy mechanism for picking are inverted triangle, if coordinate is S
c(
x,
y), S
c(
x+ 2,
y), S
c(
x+ 1,
y-1) the A phase coil coordinate, now selecting to open is S
a(
x+ 1,
y), B phase coil coordinate is S
b(
x+ 1,
y), C phase coil coordinate is S
c(
x,
y);
(2) three the C phase coil relative positions be coupled with secondary magnetic energy mechanism for picking are positive triangle, if coordinate is S
c(
x,
y), S
c(
x+ 2,
y), S
c(
x+ 1,
y+ 1) the A phase coil coordinate, now selecting to open is S
a(
x+ 1,
y), B phase coil coordinate is S
b(
x+ 1,
y), C phase coil coordinate is S
c(
x,
y).
10. the control method of a kind of three-phase wireless power supply system load situation detection according to claim 1, it is characterized in that: the control method that load situation detects: DC power supply is by producing three-phase high-frequency alternating current after three phase combined inverter, according to the putting position of load in primary coil array, load situation detection method is utilized automatically to detect load situation, and control primary coil selector switch and open three coils on a certain summit, load position place as former limit magnetic energy for emission coil, inverter exports high-frequency alternating current and convert three-phase symmetrical high frequency sinusoidal alternating current to after the compensation mechanism of former limit, pass through three former limit magnetic energy for emission coils of gating again to spatial emission energy of electromagnetic field, based on electromagnetic induction principle, secondary magnetic energy mechanism for picking induces same frequency alternating current, for load provides energy after secondary compensation mechanism and secondary current rectifying and wave filtering circuit, concrete steps are:
1) power-up initializing, system is in standby mode, and now control primary coil selector switch and be all in off-state, system energy consumption is very low;
2) when being placed with wireless power load on the former limit of three-phase wireless power supply system powers platform, the position of secondary magnetic energy mechanism for picking in primary coil array is detected by load situation detection algorithm, opening three coil composition three-phase wireless power supply systems on a certain summit by controlling primary coil selector switch, is load supplying;
3) system enters scan round state, judges whether the coordinate information that reader reads changes, thus judges whether load situation changes; If load situation changes, repeat above-mentioned (2) process, if again detection platform does not have load, return (1) process, system reenters standby mode.
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| 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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| CN112003389A (en) * | 2020-09-04 | 2020-11-27 | 江苏方天电力技术有限公司 | Robot wireless charging rapid positioning system and method based on multi-transmitting coil array |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104917302A (en) * | 2015-07-08 | 2015-09-16 | 重庆大学 | Pair-embedded energy emission coil of wireless power supply system of electric car, design method thereof, and coil system |
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| CN112003389A (en) * | 2020-09-04 | 2020-11-27 | 江苏方天电力技术有限公司 | Robot wireless charging rapid positioning system and method based on multi-transmitting coil array |
| CN112003389B (en) * | 2020-09-04 | 2021-11-23 | 江苏方天电力技术有限公司 | Robot wireless charging rapid positioning system and method based on multi-transmitting coil array |
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| WO2023098173A1 (en) * | 2021-12-01 | 2023-06-08 | 荣耀终端有限公司 | Wireless charging circuit and device |
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