CN104104159A - Magnetic resonance coupling multi-load wireless charging platform with uniform magnetic field characteristic - Google Patents
Magnetic resonance coupling multi-load wireless charging platform with uniform magnetic field characteristic Download PDFInfo
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- CN104104159A CN104104159A CN201410300222.5A CN201410300222A CN104104159A CN 104104159 A CN104104159 A CN 104104159A CN 201410300222 A CN201410300222 A CN 201410300222A CN 104104159 A CN104104159 A CN 104104159A
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- load
- inductance
- array
- charging platform
- wireless charging
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Abstract
The invention discloses a magnetic resonance coupling multi-load wireless charging platform with the uniform magnetic field characteristic. The charging platform comprises an alternating current power supply, a source end coupling inductance coil, a source end tuning capacitor, inductance coil arrays, an array tuning capacitor, an array connecting conductor, fixed support platforms, additional support platforms, load end coupling inductance coils, load end tuning capacitors and brackets, wherein the alternating current power supply, the source end coupling inductance coil and the source end tuning capacitor are connected in series; the inductance coil arrays are connected in series with the array tuning capacitor by the array connecting conductor; the load end coupling inductance coils are connected in series with the load end tuning capacitors, and connected with a load circuit by output ports; inductance coils of the inductance coil arrays are wound on the side surfaces of the fixed support platforms; and the fixed support platforms are fixed with the brackets and support the inductance coil arrays. The charging platform is simple in structure and easy to implement; a coupling coil of a to-be-charged load can be freely placed in any position in a uniform magnetic field area in parallel, without influencing a charging effect of the load; and simultaneous charging of multiple loads can be supported.
Description
Technical field
The invention belongs to wireless energy transfer system design field.
Background technology
As a kind of novel wireless energy transmission technology, magnetic resonance manifold type wireless charging technology can be transmitted electric energy with higher efficiency in the distance times over inductance necklace bore, and having overcome induction type wireless charging technology can only be in just applicable drawback of very near distance.Can be used for the various application scenarios from milliwatt level to multikilowatt.
Traditional magnetic resonance manifold type wireless charging system has two kinds of four inductance coil forms and two inductance coil forms.In four inductance coil forms, power supply is coupled by a coupled inductor and emission inductance coil, and load is coupled by another coupled inductor and receiving inductance coil; And in two inductance coil forms, coupled inductor is cancelled, power supply, load are directly connected with emission inductance coil, receiving inductance coil.Their common feature is single supply, single load, and efficiency and power are very responsive to the distance between inductance coil, relative position.And if be confined to the conventional art of this man-to-man single supply, single load, charge and can only adopt the method for multiple charging devices multiple loads simultaneously.
The at present wireless charging technology of more existing uniform magnetic fields, being characterized in can be at certain space region generating uniform magnetic field, in this area of space, load to be charged (with and coupled inductor) can arbitrarily move and not affect its charging performance.But they are based on magnetic induction principle, uniform magnetic field region is limited on the certain two dimensional surface of area conventionally, cause the position of the coupled inductor of load to be limited in the scope of several millimeters of range transmission coils, this has greatly limited further developing and applying of wireless charging platform.
For overcoming the above-mentioned weakness of magnetic inductive uniform magnetic field wireless charging technology, the drawback that the magnetic resonance manifold type wireless charging load breaking traditions can only be placed on fixed position and can only charge to single load, meet the demand of increasing multi-load wireless charging, there is larger three-dimensional uniform magnetic field space, the technical scheme that can simultaneously charge to multi-load in the urgent need to a kind of.This scheme is also tackled each charging load and is effectively isolated, to avoid between multiple charging loads the phase mutual interference when the charging.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, propose a kind of magnetic resonance manifold type wireless charging platform, utilize multiplely coaxial to form the inductance coil array that can produce uniform magnetic field within the scope of certain three-dimensional spatial area around the parallel electric inductance coil to identical.This platform can charge to multiple loads simultaneously; The coupled inductor of charging load can be placed on optional position within the scope of this uniform magnetic field region; When multi-load charging, as long as the spaced certain position of coupled inductor of charging load just can isolate mutually, ensure that charged state is independent of each other.
The present invention is achieved by the following technical solutions.
The present invention connects wire (2), stationary gantry (5), additional saddle (12), load end coupled inductor (4), load end tuning capacitance (7), support (6) formation by AC power (9), source coupled inductor (3), source tuning capacitance (10), inductance coil array (11), array tuned electric capacity (1), array.AC power (9) and source coupled inductor (3) and source tuning capacitance (10) are in series by wire, inductance coil array (11) and array tuned electric capacity (1) by array be connected that wire (2) is in series, load end coupled inductor (4) and load end tuning capacitance (7) be in series, and be connected with load circuit by output port (8).
Described inductance coil array (11) is in series by wire (2) by two or more coaxial parallel heavy caliber air-core inductances, around to being consistent.So, can near the cylindricality region (cylindricality region shape of cross section depends on the shape of array inductance coil) being formed for top for bottom, the top inductance coil by bottom inductance coil, obtain approximate uniform magnetic field.These described inductance coils can be circular, can coiling be also rectangle or other geometry.
These heavy caliber air-core inductances are wrapped on stationary gantry (5) side, stationary gantry (5) is the flat rod structure of being made up of nonmetal, nonmagnetic substance (as glass, plastics etc.), fixes and support inductance coil array together with support (6).In each stationary gantry (5), except the stationary gantry of the most close source coupled inductor (3), electrical equipment to be charged can be placed on charging of other stationary gantry above.In addition, also can the space between the stationary gantry of highest and lowest in, some additional saddles (12) are placed in other appropriate location that is parallel to stationary gantry.
Support (6) is made up of nonmetal, nonmagnetic substance (as glass, plastics, timber etc.), except the effect of fixing and support stationary gantry (5) and inductance coil array (11), can also support multiple additional saddles (12) and be placed in approximate uniform magnetic field region.Stationary gantry (5) and additional saddle (12) are arranged in uniform magnetic field space, axial perpendicular to inductance coil array (11), supported, are fixed by support (6).
The total inductance of inductance coil array is divided into two parts, and a part is the self-induction of each air core coil, and another part is the mutual inductance each other of each air core coil, total inductance amount
l afor the summation of above two parts inductance.Array tuned capacitor C
a(1) by the resonance frequency of inductance coil array be tuned to operating frequency
f 0,
.Conventionally operating frequency,
f 0can in 125KHz, 133KHz, 225KHz, 13.56MHz equifrequent, select.
Source coupled inductor (3, inductance value
l s) be placed on charging platform bottom, be placed in other position in the cylindric region of uniform magnetic field but also can be parallel to coil array, source tuning capacitance (10,
c s) tuning for source resonant circuit, its effect be by resonance frequency also be tuned to operating frequency
f 0,
l swith
c smeet resonance relation
.
Load end coupled inductor
l land load end tuning capacitance
c l(7) be in series by wire and output port (8), general load end coupled inductor
l lcan lie on stationary gantry or additional saddle.Load end tuning capacitance
c l(7) tuning for load end resonant circuit, its resonance frequency also be tuned to operating frequency
f 0,
l lwith
c lmeet resonance relation
.Equipment to be charged and charging circuit (comprising rectification, filtering, match circuit) are directly connected to output port (8).
AC power (9) is come through full-bridge inverting or semi-bridge inversion conversion by AC-DC-AC circuit by DC-AC or low-frequency ac source (as 220V50Hz civil power) for DC power supply.So, AC power (9) can be equivalent to the alternating-current voltage source of 0 ohmic internal resistance.
Designing and producing inductance coil array (11) coil inductance
l a, source coupling coil (3) inductance
l swith load end coupling coil inductance
l ltime, suggestion meets constraints
m sA=
m aL, to obtain the effect of source coupling.Here,
m sAbe
l swith
l amutual inductance,
m aLbe
l awith
l lmutual inductance.
In the time having multiple loads to charge, for the phase mutual interference between Avoids or reduces charging load, should meet relational expression simultaneously
m lmLn<<
m sA,
m lmLnit is the mutual inductance between m load end coupling coil and n load end coupling coil.For reaching this purpose, can be by spatially spaced certain distance of load end coupling coil.As can be by load placed in the stationary gantry of differing heights (difference in height is greater than 2 times of load coupling coil diameters); If be placed on same stationary gantry or additional saddle, the distance of center circle of load coupling coil is at least greater than 2 times of load coupling coil diameters.
The effect of invention: charging platform disclosed by the invention is simple in structure, easily implements.The present invention utilizes around produce approximate uniform cylindricality region (cylindricality region shape of cross section depends on the geometry of array inductance coiled notebook body), magnetic field to identical sparse parallel electric inductance coil array, therefore the coupling coil of load to be charged can arbitrarily be placed on any place in this region abreast, and does not affect its charging effect.
This wireless charging platform can support multiple loads to charge simultaneously.When the mutual inductance between load coupling coil is during much smaller than mutual inductance between load coupling coil and uniform magnetic field coil array, influencing each other between charging load can be ignored.
Brief description of the drawings
Fig. 1 is total system circuit theory diagrams of the present invention.Wherein, 1 is array tuned electric capacity, and 2 for array connects wire, and 3 is source coupling coil, and 4 is load end coupling coil, 5 is stationary gantry, and 6 is support, and 7 is load end tuning capacitance, and 8 is output port, 9 is power supply, and 10 is source tuning capacitance, and 11 is inductance coil array, and 12 is additional saddle.
Fig. 2 is the circuit system schematic diagram of embodiment, and in figure, two loads are reduced to ohmic load
r l1with
r l2.
Fig. 3 be embodiment illustrated in fig. 2 in, the vertical section magnetic line of force distribution map of two parallel electric inductance coil arrays, figure center line part represents approximate uniform magnetic field region.
Fig. 4 is that voltage source peak-to-peak value is
v s=20V, load resistance
r l1=8 Ω,, load
r l2when open circuit (only to single load
r l1charging), frequency (kHz)-current amplitude (A) curve chart.When frequency is 225.0kHz (operating frequency), I
1=2.543A.
Fig. 5 is that voltage source peak-to-peak value is
v s=20V, load
r l1open circuit, load resistance
r l2while being 10 Ω (only to single load
r l2charging), frequency (kHz)-current amplitude (A) curve chart.When frequency is 225.0kHz, I
2=1.916A.
Fig. 6 is that voltage source peak-to-peak value is
v s=20V, load resistance
r l1=8 Ω, load resistance
r l2=10 Ω, (equal 2 times of load coupling coil diameters) when the distance of center circle of load end coupled inductor is 10cm, frequency (kHz)-current amplitude (A) curve chart.When frequency is 225.0kHz, I
1=2.533A, I
2=1.906A.
Fig. 7 is that voltage source peak-to-peak value is
v s=20V, load resistance
r l1=8 Ω, load resistance
r l2=10 Ω, (equal 1 times of load coupling coil diameter) when the distance of center circle of load end coupled inductor is 5cm, frequency (kHz)-current amplitude (A) curve chart.When frequency is 225.0kHz, I
1=2.062A, I
2=1.664A.
Embodiment
The present invention is described further by specific embodiment in connection with accompanying drawing, but should not serve as the restriction of the scope of the invention and application thereof.
Embodiment.Parallel coaxial twin coil array uniform magnetic field charging platform.
This charging platform as shown in Figure 2.Coil array is in series by 2 air core coils at a distance of 15cm, bore (diameter) 30cm, and each air core coil is formed by enamel covered wire coiling 10 circles of linear diameter 0.8mm.Its total inductance
l abe 240 μ H, tuning capacitance
c a=2.1nF, is tuned at
fin the system works frequency of=225KHz.As shown in Figure 3, region shown in frame line (cylinder) internal magnetic field is approximate is as seen from the figure uniformly distributed this coil array Distribution of Magnetic Field sectional arrangement drawing around.Electric source coupling coil bore (diameter) 10cm, is formed by enamel covered wire coiling 3 circles of linear diameter 0.8mm, and its inductance value is about
l s=2.77 μ H, tuning capacitance
c s=0.18 μ F.Load coupling coil specification is identical, and bore (diameter) 5cm is formed by enamel covered wire coiling 12 circles of linear diameter 0.8mm, and its inductance value is about
l l=19 μ H, tuning capacitance
c l=26nF.Load coupling coil is placed on saddle, and the distance of center circle between each load coupling coil should be not less than 10cm.
Fig. 4-Fig. 7 has provided voltage source peak-to-peak value
v s=20V, load 1 resistance
r l1=8 Ω, load 2 resistance
r l2while being 10 Ω, the simulation curve of frequency (the kHz)-current amplitude (A) under different situations.Fig. 4 correspondence only has
r l1while existence; Fig. 5 correspondence only has
r l2while existence.The current amplitude at centre frequency place can be used formula
v s/
r liestimation.For example: at 225kHz place, the current amplitude value in load 1 should be 20V/8 Ω=2.5A, and the current amplitude value in load 2 should be 20V/10 Ω=2A; Substantially identical with 2.543A and 1.916A that emulation obtains.Corresponding two loads of Fig. 6 are charged simultaneously, and the distance of center circle of coupling coil be 10cm situation, current amplitude value I
1=2.533A, I
2=1.906A, during with single load charging compared with, only reduce respectively 0.39% and 0.5%.Corresponding two loads of Fig. 7 are charged simultaneously, and the distance of center circle of coupling coil be 5cm situation, now current amplitude value I
1=2.062A, I
2=1.664A, has reduced respectively 18.9% and 13.2% compared with during with single load charging.Visible, when multi-load charging and while being placed on same saddle, if when times coil diameter of distance of center circle >=2 of coupling coil, each load is charged independently of one another, it influences each other very little, and the power that load absorbs is determined by source voltage and load circuit self equiva lent impedance completely.
Claims (6)
1. there is a magnetic resonance manifold type multi-load wireless charging platform for uniform magnetic field characteristic, it is characterized in that connecting wire (2), stationary gantry (5), additional saddle (12), load end coupled inductor (4), load end tuning capacitance (7), support (6) formation by AC power (9), source coupled inductor (3), source tuning capacitance (10), inductance coil array (11), array tuned electric capacity (1), array; Described inductance coil array (11) is in series by wire (2) by two or more coaxial parallel heavy caliber air-core inductances, around to being consistent;
AC power (9) and source coupled inductor (3) and source tuning capacitance (10) are in series by wire, inductance coil array (11) and array tuned electric capacity (1) by array be connected that wire (2) is in series, load end coupled inductor (4) and load end tuning capacitance (7) be in series, and be connected with load circuit by output port (8); Heavy caliber air-core inductance is wrapped on stationary gantry (5) side, and stationary gantry (5) is nonmetal, the flat rod structure of nonmagnetic substance, fixes and support inductance coil array (11) together with support (6).
2. wireless charging platform according to claim 1, is characterized in that described heavy caliber air-core inductance is circle or rectangle.
3. wireless charging platform according to claim 1, it is characterized in that in the space between stationary gantry (5), place some additional saddles (12) that are parallel to stationary gantry (5), support and fix by support (6).
4. wireless charging platform according to claim 1, is characterized in that system works frequency is 125KHz, 133KHz, 225KHz or 13.56MHz; Array tuned electric capacity (1) by inductance coil array (11) be tuned to operating frequency; Source tuning capacitance (10) by source coupled inductor (3) be tuned to operating frequency; Load end tuning capacitance (7) by load end coupled inductor (4) be tuned to operating frequency.
5. wireless charging platform according to claim 1, is characterized in that AC power (9) comes through full-bridge inverting or semi-bridge inversion conversion by AC-DC-AC circuit by DC-AC or low-frequency ac source for DC power supply.
6. wireless charging platform according to claim 1, is characterized in that inductance coil array (11) coil inductance
l a, source coupling coil (3) inductance
l swith load end coupling coil inductance
l l, meet constraints
m sA=
m aL, wherein,
m sAbe
l swith
l amutual inductance,
m aLbe
l awith
l lmutual inductance.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410300222.5A CN104104159B (en) | 2014-06-30 | 2014-06-30 | There is the magnetic resonance manifold type multi load wireless charging platform of uniform magnetic field characteristic |
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| CN201410300222.5A CN104104159B (en) | 2014-06-30 | 2014-06-30 | There is the magnetic resonance manifold type multi load wireless charging platform of uniform magnetic field characteristic |
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Cited By (4)
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| CN105632680A (en) * | 2016-03-28 | 2016-06-01 | 中国船舶重工集团公司第七一〇研究所 | Implementation method of combined magnetic field coil |
| CN105958666A (en) * | 2016-06-06 | 2016-09-21 | 南昌大学 | Expandable wireless charging pad with multi-load isolation characteristics |
| CN108667154A (en) * | 2018-05-21 | 2018-10-16 | 南昌大学 | A kind of multifrequency multi-load wireless charging platform with load isolation characteristic |
| CN117097262A (en) * | 2023-10-16 | 2023-11-21 | 苏州博创医疗器械有限公司 | High-frequency resonance applicator |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105632680A (en) * | 2016-03-28 | 2016-06-01 | 中国船舶重工集团公司第七一〇研究所 | Implementation method of combined magnetic field coil |
| CN105632680B (en) * | 2016-03-28 | 2017-11-21 | 中国船舶重工集团公司第七一〇研究所 | A kind of implementation method of magnetic coil system |
| CN105958666A (en) * | 2016-06-06 | 2016-09-21 | 南昌大学 | Expandable wireless charging pad with multi-load isolation characteristics |
| CN105958666B (en) * | 2016-06-06 | 2019-10-01 | 南昌大学 | It is a kind of to expand wireless charging electrical pad with multi-load isolation characteristic |
| CN108667154A (en) * | 2018-05-21 | 2018-10-16 | 南昌大学 | A kind of multifrequency multi-load wireless charging platform with load isolation characteristic |
| CN108667154B (en) * | 2018-05-21 | 2024-03-29 | 南昌大学 | Multi-frequency multi-load wireless charging platform with load isolation characteristic |
| CN117097262A (en) * | 2023-10-16 | 2023-11-21 | 苏州博创医疗器械有限公司 | High-frequency resonance applicator |
| CN117097262B (en) * | 2023-10-16 | 2024-01-30 | 苏州博创医疗器械有限公司 | High-frequency resonance applicator |
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