CN104008846A - Variable pitch spiral coil - Google Patents
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- CN104008846A CN104008846A CN201310118927.0A CN201310118927A CN104008846A CN 104008846 A CN104008846 A CN 104008846A CN 201310118927 A CN201310118927 A CN 201310118927A CN 104008846 A CN104008846 A CN 104008846A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F5/00—Coils
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2871—Pancake coils
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/14—Inductive couplings
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Abstract
An inductive coil for a contactless power supply system is provided. The inductive coil includes a conductive element in a planar spiral pattern, wherein the pitch between adjacent spirals is greater near the center of the planar spiral pattern than near the outer periphery of the planar spiral pattern. The inductive coil can be used as any one of a primary coil, a primary side resonator coil, a secondary side resonator coil, and/or a secondary coil to increase the efficiency of a power supply system across a range of distances and alignment orientations. In some embodiments, the spirals are spaced apart from the center of the spiral pattern by a distance that increases in proportion to a square root curve, such that the spirals group together near the outer periphery of the spiral pattern.
Description
Technical field
The present invention relates to non-contact electric power system, and relate more specifically to the induction coil for non-contact electric power system.
Background technology
Non-contact electric power system comprises electric energy transmission from power supply to one or more portable units in the situation that there is no mechanical connection.Electromagnetic Field when typical non-contact electric power drives changing currents with time to produce by primary coil.One or more portable units can comprise secondary coil separately.When secondary coil being positioned over when described near Electromagnetic Field, this alternating current of inducting in secondary coil, is transferred to portable unit by electric power from non-contact electric power thus.
Conventionally expectation is the electric power transfer improving between primary coil and secondary coil.Can improve electric power transfer by changing many parameters.For example, can improve electric power transfer by tuning coupling coefficient---described coupling coefficient is relevant with the relative geometry of primary coil and secondary coil.In further example, can be by introducing ferrite magnetic core element or improving electric power transfer by increasing one or more resonator coil.For example, non-contact electric power can comprise that resonator coil and portable unit can comprise resonator coil.In this four coil structures, primary coil (L1) and resonator coil (L2) pairing, and secondary coil (L4) and resonator coil (L3) pairing.Resonator coil (L2 and L3) cooperation strengthens induction power transmission, particularly in middle distance application.
Although above-mentioned known technology has improved electric power transfer, but still there are lasting needs to improving the overall system efficiency of non-contact electric power system.In addition, to shorten the required time of battery recharge and also make to minimize lasting needs from the stray electrical magnetic radiation of non-contact electric power by improving electric power transfer level simultaneously.Efficiency is brought up to aspiration level and can accelerate potentially the employing of non-contact electric power in charger, for example comprise the charger for smart mobile phone, flat computer, laptop computer, personal digital assistant and other devices.
Summary of the invention
A kind of induction coil for non-contact electric power system is provided.Described induction coil comprises the conducting element with planar spiral pattern, wherein the pitch between adjacent spiral near the center of described spirality pattern than large near the outward flange at described spirality pattern.Described induction coil can be used as any one in primary coil, primary side resonator coil, primary side resonator coil and/or secondary coil to improve the whole efficiency of power-supply system across a series of distances and aligned orientation, and for a series of non-contact electric powers application.
In one embodiment, described induction coil comprises the conducting element with planar spiral pattern, and the pitch between the adjacent spiral of wherein said planar spiral pattern reduces gradually with the continuous circle of described spirality pattern.The Center Gap of described spiral and described spirality pattern is opened certain distance, and described distance increases pro rata with square root curve, and described spiral is concentrated in together near the outward flange of described spirality pattern.
In another embodiment, described induction coil comprises the conducting element with planar spiral pattern, described planar spiral pattern has innermost spiral, outmost spiral and a plurality of intermediate conveyor screw, wherein when radially (radial) along from described spirality pattern, described in mind-set, the outward flange of spirality pattern extends measures described in the pitch that is adjacent between spiral of innermost spiral be greater than the pitch between any two adjacent intermediate conveyor screws.
In another embodiment, described induction coil comprises the conducting element with planar spiral pattern, wherein the pitch between adjacent spiral reduces gradually in the first of described spirality pattern, and wherein the pitch between adjacent spiral keeps constant substantially on the second portion of described planar spiral pattern, and described second portion is the outside in described first radially.
In also having an embodiment, described induction coil comprises the conducting element with planar spiral pattern, and wherein the pitch between adjacent spiral is large in some regions than in other regions.In this embodiment, described pitch can increase in the first of described spirality pattern, and and then be again to increase in the third part of described spirality pattern before on the second portion of described spirality pattern, reduce.On the contrary, described pitch can reduce in the first of described spirality pattern, and and then be again to reduce in the third part of described spirality pattern before on the second portion of described spirality pattern, increase.
In also having another embodiment, described induction coil is the primary side resonator coil being folded between electric power transfer surface and primary coil.Described resonator coil comprises the conducting element with planar spiral pattern, and wherein adjacent spiral is less than near the second spiral density having the outward flange at described spirality pattern near the first spiral density having the center of described spirality pattern.In this embodiment, primary coil and more close outer peripheral spiral extend (coextensive) substantially jointly, reduce thus described primary coil and are positioned at the coupling between the secondary coil above described electric power transfer surface.
In a further embodiment, described induction coil comprises having round screw thread shape pattern, square spirality pattern, oval spirality pattern, rectangular coil shape pattern, logarithm spirality pattern, comprise single order and the fractal fractal spirality pattern of second order or the conducting element of other spirality patterns.Described conducting element can comprise conductor wire winding, printed traces winding, twisted wire or other conducting elements, is in series electrically connected to the resonance frequency that provides tuning alternatively with capacity cell.In addition, described induction coil can comprise magnetic core element, ferrite magnetic core element for example, and in other embodiments, described induction coil can be with any magnetic core, is generally without magnetic core.
Therefore, embodiments of the invention can be provided for non-contact electric power system and comprise for example modified model induction coil of other circuit arrangements of drive electronics.When as primary coil or as primary side resonator coil, described induction coil is realized wireless power for a plurality of devices on the larger region on known system.In addition, variable pitch spirality pattern can increase the minimum coupling coefficient in target charging region, and also reduces maximum coupling coefficient simultaneously.This makes again secondary coil in low coupling regime, attract more electric power and must suppress less overvoltage in high coupling regime simultaneously.This also makes non-contact electric power can in low coupling regime, detect more signal (for example signal of communication) and have straddle mounting and puts the less deviation that the scope of existence is averaging.
With reference to understanding more fully the explanation of current embodiment and accompanying drawing and cognitive these and other advantage and feature of the present invention.
Accompanying drawing explanation
Fig. 1 is according to the vertical view of the induction coil of an embodiment.
Fig. 2 is the chart that signal meets the spirality pattern of square root curve.
Fig. 3 is that signal is according to the schematic diagram of the non-contact electric power system of an embodiment.
Fig. 4 is the sectional view of the non-contact electric power system of schematic diagram 3.
Fig. 5 carries out coil structure and the portable unit of Performance Ratio prior art for the induction coil with Fig. 1.
Fig. 6 is the two-dimentional coupling coefficient color chart of coil structure of the prior art of Fig. 5.
Fig. 7 is without the two-dimentional coupling coefficient color chart of the induction coil of FERRITE CORE element, Fig. 1.
Fig. 8 is the two-dimentional coupling coefficient color chart that comprises induction coil ferrite magnetic core element, Fig. 1.
Embodiment
Current embodiment relates to the induction coil for non-contact electric power system and other circuit arrangements.Described induction coil comprises the conducting element with planar spiral pattern substantially, wherein the pitch between adjacent spiral near the center of spirality pattern than large near the outward flange at spirality pattern.In following part I, discuss according to the induction coil of an embodiment.In following part II, statement comprises the non-contact electric power system according to the induction coil of this embodiment.In following part III, state an example.
i. induction coil
With reference now to Fig. 1,, according to the induction coil of an embodiment, be illustrated and be usually marked as 10.Induction coil 10 comprises conducting element 12, and conducting element 12 has first end 14 and the second end 16, between first end 14 and the second end 16, limits length.Conducting element 12 is arranged to and comprises approximate geometric center 18 and the two dimension of outward flange 20 or the spirality pattern of plane.Spirality pattern comprises n spiral, and wherein outmost spiral is restricted to n spiral or spiral-n, and inferior outmost spiral is restricted to n-1 spiral, by that analogy, until reach innermost spiral or spiral-1.As used in this article in term, spiral (or circle) is defined as comprising that part around geometric center 18 traversal 360 degs of conducting element 12.Can in given embodiment, use any amount of spiral, comprise and be for example greater than 200 spirals.Equally for instance, spirality pattern can be included between two to 200 spirals, comprises two and 200, alternatively between four to 40 spirals, comprise four and 40, and further alternatively between ten to 20 spirals, comprise ten and 20.
As mentioned above, spirality pattern comprises the pitch between adjacent spiral.Pitch is the measured value of the distance of separating between the center line of adjacent spiral.The difference of the spacing between the pitch between adjacent spiral and adjacent spiral is: spacing equals pitch and deducts conductor diameter or thickness.For having little diameter or the conductor of thickness, this difference may very little or even can be ignored, and in this case, conductor 12 is assumed that infinite thin.In the present embodiment, the pitch between adjacent spiral near the center 18 of spirality pattern than large near the outward flange 20 at spirality pattern.For example, pitch reduces gradually in the first 22 of spirality pattern, and keeps substantially constant on the second portion 24 of spirality pattern, wherein the second portion 24 of the spirality pattern outside of the first in spirality pattern 20 radially.Thus, the first 24 of spirality winding comprises reducing gradually of helical pitch, and the second portion 24 of spirality winding comprises constant substantially helical pitch.Yet in other embodiments, spirality pattern comprises that pitch reduces gradually from center to outer peripheral, and does not comprise having the second portion 24 of constant pitch substantially.
The distance at center 18 that also can be based on to spirality pattern is described spirality pattern.For example, the distance to the center 18 of spirality pattern can increase gradually according to square root curve.That is to say, each some place of arbitrarily radially 26 (for example 270 ° radially) that extend at Yan Cong center 18, increases pro rata to the distance at center 18 and the square root of n of spirality pattern, and wherein n is corresponding to spiral number.The square spirality pattern of 8 inches * 8 inches that is 35.58 μ H for inductance below shows according to the numerical value of an embodiment, and with chart, described numerical value is described in Fig. 2:
At this, reaffirm, spirality pattern comprises the repeat patterns of spiral, and when radial measurement along common, each spiral is limited to the distance at the center of spirality pattern, and wherein the square root of the spiral of this distance and this spiral number is proportional.For example, in the embodiment shown in above Fig. 1-2, by the square root of n is multiplied by the distance that proportionality constant c determines each spiral, wherein c equals the distance between the center 18 of spiral-1 and spirality pattern alternatively, or is in the present embodiment 1.24 inches.Below described this equation:
(1) arrive the distance=c*sqrt (n) at center
Utilize equation (1), can be along radially common, for example negative x axle as shown in Figure 2 calculates the distance of each spiral.Except this radially, can also use radially different.For example, rectangular coil shape pattern can comprise different distance in the y-direction.Utilize above-mentioned equation (1), y distance equals the square root multiplication by constants c of each circle n, and wherein c equals the y distance of spiral-1 alternatively.
As alternatively anticipate as shown in Fig. 1, between spiral-11 and spiral-12, comprise additional spiral 28, wherein this additional spiral does not meet the square root curve of Fig. 2.On the contrary, additional spiral 28 substantially uniformly-spaced, makes these three spiralizations second portion 24 of constant helical pitch substantially between spiral-11 and spiral-12.Further alternatively, spirality pattern can adopt any planar geometry substantially, the square spiral or the rectangular coil that for example comprise as describe substantially in Fig. 1.Alternatively, spirality pattern can comprise single full curve, comprises for example oval spiral or round screw thread.In other embodiments, spirality pattern can adopt different geometries according to expectation.For example, spirality pattern can comprise logarithm spirality pattern or fractal spirality pattern, and for example single order is fractal or second order is fractal, and it can produce level and smooth flux field density potentially.In addition, spirality pattern can be formed by any electric conducting material substantially, comprises for example twisted wire, copper cash, etched conductors or printed conductor.
II.
non-contact electric power system
As mentioned above, induction coil 10 is suitable for for non-contact electric power system and other circuit arrangements.For example, induction coil 10 can be combined with non-contact electric power system 30, and non-contact electric power system 30 has non-contact electric power 32 and one or more portable unit 34,36, and it is described substantially in Fig. 3-4.Non-contact electric power 32 can comprise primary coil 38 and primary side resonator coil 40, and portable unit 34,36 can comprise primary side resonator coil 42 and secondary coil 44 alternatively.As described below, any one in these sensing elements 38,40,42,44 or all can comprise induction coil 10 of the present invention.
More specifically, non-contact electric power 32 comprises power supply 46, signal generating circuit 48 (it is depicted as inverter), wireless power transmission device 50 and control system 52.The power supply 46 of current embodiment can be AC input (for example Direct Plug-In power supply) to be converted to the normal power supplies of the suitable DC output that is applicable to drive wireless power transmission device 50.As alternative, power supply 46 can be the DC electric power source that is applicable to supplying power to wireless power transmission device 50.In this embodiment, power supply 46 comprises rectifier 54 and DC-DC transducer 56 substantially.Rectifier 54 and DC-DC transducer 56 provide suitable DC electric power for power supply signal.Power supply 46 alternatively can comprise any circuit substantially that input electric power can be converted to the form that signal generating circuit 48 uses.Control system 52 can be constructed to adjusting operation parameter.For example, control system 52 can have the ability of adjusting rail voltage or commutation circuit phase place.In expectation, by changing rail voltage, come in the alternative of adjusting operation parameter, DC-DC transducer 56 can have variable output.As shown in Figure 3, suitable control system 52 can be with DC-DC transducer 56 (being illustrated by the broken lines) coupling to allow suitable control system 52 to control the output of DC-DC transducer 56.
Signal generating circuit 48 comprises commutation circuit, and it is constructed to generate input signal and input signal is applied to wireless power transmission device 50.Commutation circuit can form the DC output from power supply 46 is converted to the inverter that AC exports to drive wireless power transmission device 50.Commutation circuit can change with the difference of application.For example, commutation circuit can comprise a plurality of switches of arranging with half-bridge topology or full-bridge topologies, such as MOSFET.Power transmitter 50 comprises oscillation circuit (tank circuit) 58 resonator circuit 62, wherein oscillation circuit 58 has primary coil 38 and the ballast capacitor 60 that is arranged to formation series resonance oscillation circuit, and resonator circuit 62 has resonator coil 40 resonator capacitors 64.Terms of primary circuit can be used to refer to whole oscillation circuit 58 or refer to primary coil 38.Terms of primary resonator circuit can be used to refer to whole resonator circuit 62 or refer to resonator coil 40.The invention is not restricted to use together with series resonance oscillation circuit, and instead can use with together with the resonance oscillations loop of other types, and even use together with disresonance oscillation circuit, such as the simple inductor that there is no matching capacitance.And although the embodiment illustrating comprises coil, non-contact electric power 32 can comprise alternative inductor or the structure that can generate suitable electromagnetic field.
Control system 52 comprises and is constructed to operate commutation circuit to produce the part of the power supply signal of expectation to wireless power transmission device 50 except other.Suitable control system 52 can be controlled commutation circuit by the signal of communication based on receiving from remote-control device 34,36.The suitable control system 52 of this embodiment comprises the control circuit of carrying out various functions, such as controlling timing and the extraction of commutation circuit and explaining signal of communication.These functions alternatively can be processed by independent controller or other special circuits.
As shown in Figure 4, non-contact electric power 32 comprises that electric power transfer surface 82, to receive portable unit 34,36 in a plurality of positions along electric power transfer surface 82, makes portable unit 34,36 have spatial degrees of freedom in two dimensions in addition.In this structure, primary coil 38 is positioned transverse to resonator coil 40.In addition, primary coil 38 and the total coupling coefficient of primary side resonator coil 40 are greater than coupling coefficient total between primary coil 38 and secondary coil 44 or primary side resonator coil 42.Between primary coil 38 and resonator coil 40, be folded with optional shield 83.This shield is usually positioned as and does not make some coupling interrupted and other couplings are reduced.In certain embodiments, shield 83 is flux concentrator or flux guiding.In other embodiments, a part for shield 83 is flux concentrator.Optional magnetic core element 85 is positioned in the center of spirality pattern, potentially the coupling coefficient on level and smooth larger region.In addition, although only six spirals are described in Fig. 4, primary side resonator coil 40 can comprise any amount of spiral, for example comprises as 13 spirals depicted in figure 1.
Portable unit 34,36 according to an embodiment of the invention will be described now in more detail.Portable unit 34,36 can comprise substantially conventional electronic installation, such as mobile phone, media player, hand-hold type broadcast receiver, camera, flashlight or any other portable electronic installation substantially.The electrical energy storage device that portable unit 34,36 can comprise such as battery, capacitor or ultracapacitor, or portable unit 34,36 can not operate in the situation that there is no electrical energy storage device.Conventional and therefore will repeat no more substantially with the assembly of the main operative association (and not associated with wireless power transmission) of portable unit 34,36.On the contrary, be usually called basic load 66 with the assembly of the main operative association of portable unit 34,36.For example, under the background of mobile phone, need not require great effort to describe the electronic building brick associated with mobile phone itself.
The portable unit 34,36 of this embodiment comprises wireless receiver 68, rectifier 70, secondary communication transceiver (not shown) and basic load 66 substantially.Portable unit 34,36 can comprise controller.Wireless receiver 68 can comprise secondary oscillation loop 72 and secondary resonance device circuit 76, wherein secondary oscillation loop 72 has secondary coil 44 and secondary oscillation tank capacitance device 74, and secondary resonance device circuit 76 has secondary resonance device coil 42 and secondary resonance device capacitor 78.Term secondary circuit can refer to secondary oscillation loop or secondary coil.In certain embodiments, wireless receiver 68 can not comprise secondary oscillation tank capacitance device.Term secondary resonance device circuit can refer to whole secondary resonance device circuit or secondary resonance device coil.In certain embodiments, portable unit can not comprise secondary resonance device circuit 76, comprises for example at the portable unit 36 shown in Fig. 3.The invention is not restricted to the topological structure at the wireless receiver 68 of the embodiment anticipating shown in Fig. 3.Alternative for example can comprise secondary oscillation loop 72 and secondary resonance device circuit 76 both all with rectification circuit 70 couplings of portable unit, rather than the secondary resonance device circuit 76 shown in embodiment is as schematically shown in Figure 3 independent of secondary oscillation loop 72.
Rectifier 70 and regulating circuit 80 are converted to the electric power for the operation of load 66 by the AC electric power producing in wireless power receiver 68.Regulating circuit 80 can for example comprise DC-DC transducer in the conversion to DC electric power and those embodiment that the adjusting of DC electric power is supposed to.In the application being supposed in portable unit 34,36 at AC electric power, rectifier 80 may be also inessential.In certain embodiments, regulating circuit can be unnecessary or be implemented as the part of load 66.Although not signal, portable unit 34,36 can comprise the secondary communication transceiver that is suitable for coming via the wireless power link with non-contact electric power 32 modulation and demodulation information.Alternatively, can between portable unit and non-contact electric power, set up independent communication channel, can process its function by independent controller or other special circuits.Non-contact electric power 32 and portable unit 34,36 can be constructed to communicate by letter with any data coding scheme substantially.
Except the non-contact electric power system of stating in conjunction with Fig. 3-4 above, the present invention can be merged in the disclosed non-contact electric power of Publication about Document: the United States Patent (USP) 7 that is entitled as " Adaptive Inductive Power Supply (adaptive inductive power supply) " and announces on May 1st, 2007 of authorizing Baarman, 212,414; Authorize the United States Patent (USP) 7,522,878 that is entitled as " Adaptive Inductive Power Supply with Communication (adaptive inductive power supply with communication) " and announces on April 21st, 2009 of Baarman; The U. S. application that being entitled as of Baarman " Coil Configuration for Inductive Power Transfer (for the coil structure of induction power transmission) " and the sequence number of submitting on June 9th, 2011 are 13/156,390; The U. S. application that the sequence number that is entitled as " Wireless Power Control System (wireless power control system) " and submits on September 11st, 2012 of Baarman is 61/699,582; Or the U. S. application that the sequence number that is entitled as " Wireless Power Control (wireless power control) " and submits on September 11st, 2012 of Baarman is 61/699,643---the full content of all these documents is all incorporated to herein by reference.
III.
example
Following example is provided and should be considered to be restrictive for the object of illustrating.Especially, following example comprises the induction coil 10 of Fig. 1 and the comparison of the resonator coil 100 of the prior art of Fig. 5.When with portable unit in secondary coil 102 pairing time, place at more close induction coil 10 center, induction coil 10 can obtain higher coupling coefficient, and simultaneously also across the different piece of induction coil 10, obtaining desired a series of coupling coefficients, this is particularly advantageous for charging for a plurality of portable unit time.
The resonator coil 100 of the prior art of Fig. 5 comprises 8 circle two layer winding, and it is highly that 219mm and width are 222mm.The receiver coil 102 using in this example comprises the individual layer secondary coil with 15 circles of 40/40 twisted wire, and it is highly that 31mm and width are 24mm.In Fig. 6, described coupling coefficient k, wherein coupling coefficient is originating in resonator coil 100 and describing through the scalar of that part of receiver coil 102 of flux.Interested especially, when receiver coil 102 is positioned on the corner of resonator coil 100 of prior art, coupling coefficient k is the strongest, reaches 0.085 peak value coupling coefficient k.By comparing, the coupling coefficient k that digression falls is farthest between about 0.005 and about 0.01.In addition, in the middle section of resonator coil, for example, from its outside genesis, be greater than the region of 2cm, coupling coefficient k is mainly about 0.005 to about 0.01.
Use identical receiver coil 102, there is ferrite shield and there is no in two kinds of situations of ferrite shield 10 couples of coupling coefficient k of the induction coil modeling for Fig. 1.Especially, induction coil 10 comprises individual layer square spirality pattern, and it has the inductance of 35.58 μ H, the equivalent series resistance of 0.080 ohm and the electric capacity of 45.0nF.Induction coil 10 comprises 13 spirals, and the square root that wherein spiral-1 equals spiral number (1,2,3,4...12) to the distance at spiral-12 and geometric center interval is multiplied by 1.24 inches.Spiral-11.5 are folded between spiral 11 and spiral 12 to provide closely spaced circle to adapt to better the excitation of passing through horizontal primary coil 38 of describing substantially in conjunction with Fig. 4 as above in the outside of induction coil 10.
The changing currents with time that utilization has the frequency of operation of 126kHz drives primary coil 38, power transformation magnetic flux during generation.This flux vibrates rapidly resonator coil 10, is resonance oscillations alternatively.Resonator coil 10 and then the changing currents with time of inducting in receiver coil 102.The electric current of inducting in receiver coil 102 changes with respect to the position of the geometric center 18 of resonator coil 10 based on receiver coil 102.With reference now to Fig. 7,, the coupling coefficient between resonator coil 10 and receiver coil 102 changes near about 0.040 geometric center of resonator coil 10 near about 0.060 corner of resonator coil 10.Therefore, the resonator coil 10 of Fig. 1 shows the improved coupling coefficient k of resonator coil 100 with respect to Fig. 6 in the middle section of coil.When ferrite shield 83 is folded between primary coil 38 and resonator coil 10, coupling coefficient between resonator coil 10 and receiver coil 102 changes near the geometric center of resonator coil 10 about 0.035 near about 0.065 corner of resonator coil 10, as illustrated substantially in Fig. 8.
As described in Fig. 7-8 equally, the scope of the coupling coefficient on the operating area of expection is from 0.005 to 0.085 for the resonator coil 100 of prior art, and is 0.015-0.065 for the induction coil 10 of this example.When charging panel and the coupling of a plurality of portable unit, this constriction of the scope of available coupling coefficient may be particularly advantageous.For example, in many cases, " base plate (floor) " coupling coefficient should be at least about 0.015 to allow portable unit to distinguish low power communication signal and noise and other environmental interference.If portable unit is placed in the part that having of charging panel be less than 0.015 coupling coefficient, conceivable is that portable unit cannot be identified charging panel like this, and therefore cannot start with the communication handshake of charging panel to start wireless power transmission.Equally for instance, in many cases, " top board (ceiling) " coupling coefficient does not answer right and wrong desirably high like that, and in this case, portable unit is by the overvoltage that progressively declines and induct in secondary coil.For example, portable unit may need to use DC-DC transducer, for example converter,linear or buck-boost converter, thus in the situation that need to progressively declining, increase potentially the size of portable unit.
At two or more portable units, be placed in the scheme on charging panel, the constriction scope of available coupling coefficient can be guaranteed, the position regardless of portable unit on charging panel, and at bottom line, each portable unit can be communicated by letter with charging panel.In this generation, residue portable unit can receive electric power in other positions on charging panel, and the overvoltage that progressively declines and induct in secondary coil without extra circuit.Accordingly, the constriction of available coupling coefficient make portable unit in low coupling regime, attract more electric power and in high coupling regime over-voltage suppression.The less deviation that the scope that the constriction of available coupling coefficient also makes charging panel have to exist across portable unit is averaging.
Above-mentioned explanation is the explanation to current embodiment of the present invention.Can carry out various transformations and variation and not deviate from spirit of the present invention and wider aspect as defined by the appended claims, this should explain according to the Patent Law principle that comprises equivalence principle.Present disclosure is presented for the object of signal, and should not be construed as and to the exhaustive explanation of all embodiment of the present invention or by the scope of claim, be restricted to the concrete element of illustrating or describing in conjunction with these embodiment.For instance and without limitation, described any (one or more) of the present invention discrete component can be provided similar substantially function or provide the alternative element of suitable operation to replace.For instance, this comprises current known alternative element, such as current those elements that may be known for a person skilled in the art, and may be at the alternative element that be developed in the future, such as those skilled in the art, may think those alternative elements when the research and development.In addition, the disclosed embodiments comprise a plurality of features that are unanimously described and a collection of benefit may be provided collaboratively.Except situation about explicitly pointing out in announced claim, the present invention is not limited only to those embodiment that comprise all these features or all stated benefits are provided.For example use article " ", " one ", " being somebody's turn to do " or " described " to take singulative any of claim element mentioned to should not be regarded as this element limits is odd number.
Claims (28)
1. a circuit arrangement, it comprises:
Plane winding, it comprises the spirality pattern of repetition, the spirality pattern of described repetition limits the pitch between adjacent spiral, wherein said pitch reduces gradually in the first of described plane winding, and it is constant substantially that wherein said pitch keeps on the second portion of described plane winding, and the second portion of described plane winding is the outside of the first in described plane winding radially.
2. circuit arrangement according to claim 1, wherein said first pitch is along with radially outwards moving and reduce pro rata along described plane winding.
3. circuit arrangement according to claim 1, it also comprises: the armature winding being positioned concentrically with respect to described plane winding.
4. circuit arrangement according to claim 3, the second portion of wherein said armature winding and described plane winding extends substantially jointly.
5. circuit arrangement according to claim 3, the first of wherein said armature winding and described plane winding does not have overlapping substantially.
6. circuit arrangement according to claim 3, it also comprises: be electrically connected to described armature winding and with the power supply of described plane winding electric insulation.
7. circuit arrangement according to claim 3, wherein:
Described plane winding be with portable unit in the resonance winding of secondary winding coupling; And
Described plane winding and described secondary winding limit the first coupling coefficient, and described the first coupling coefficient is greater than the coupling coefficient limiting between described armature winding and described secondary winding.
8. circuit arrangement according to claim 1, the spirality pattern of wherein said repetition is in square winding, rectangle winding, circular winding and oval winding.
9. circuit arrangement according to claim 1, it also comprises: for receiving the electric power transfer surface of at least one portable unit thereon, described plane winding is parallel to described electric power transfer surface substantially.
10. circuit arrangement according to claim 1, wherein said plane winding comprises printing conductive element, spiral element or etching conducting element.
11. 1 kinds of non-contact electric powers, it comprises:
For receiving the electric power transfer surface of at least one portable unit thereon; And
Induction coil, it is in described electric power transfer lower face, described induction coil comprises planar spiral winding, and described planar spiral winding limits the pitch between adjacent spiral, and wherein said pitch radially outwards reduces gradually from the central shaft of described induction coil.
12. non-contact electric powers according to claim 11, wherein said spiral and the spaced apart certain distance of described central shaft, described distance increases pro rata with square root curve, and described adjacent spiral is concentrated in together away from described central shaft.
13. non-contact electric powers according to claim 11, it also comprises: the primary coil that is positioned in described induction coil below.
14. non-contact electric powers according to claim 13, wherein:
Described induction coil form with described portable unit in the part of the coil inductively coupled resonant circuit of secondary wire; And
Described induction coil and described secondary coil limit the first coupling coefficient, and described the first coupling coefficient is greater than the coupling coefficient limiting between described primary coil and described secondary coil.
15. non-contact electric powers according to claim 14, wherein said resonant circuit comprises the capacitor being in series electrically connected to described induction coil.
16. non-contact electric powers according to claim 13, it also comprises the power supply with described primary coil coupling.
17. non-contact electric powers according to claim 11, wherein said induction coil comprises square winding pattern, rectangle winding pattern, circular winding pattern or oval winding pattern.
18. non-contact electric powers according to claim 11, wherein said induction coil comprises ferrite magnetic core element.
19. non-contact electric powers according to claim 11, wherein said induction coil comprises printing conductive element, spiral element or etching conducting element.
20. 1 kinds of circuit arrangements, it comprises:
Plane winding, it comprises the spirality pattern of repetition, the spirality pattern of described repetition has center and outward flange, and the pitch between the adjacent spiral of wherein said plane winding is large near the center of described plane winding than near the outward flange of described plane winding.
21. circuit arrangements according to claim 20, the Center Gap of wherein said spiral and described plane winding is opened certain distance, described distance increases pro rata with square root curve, and described spiral is concentrated in together near the outward flange of described plane winding.
22. circuit arrangements according to claim 20, wherein said helical coil comprises n spiral, wherein n is between eight and 18.
23. circuit arrangements according to claim 22, wherein the pitch between spiral n and spiral n-1 is less than the pitch between spiral n-1 and spiral n-2, and wherein spiral n is outmost spiral.
24. circuit arrangements according to claim 20, the spirality pattern of wherein said repetition comprises innermost spiral and outmost spiral, wherein when radial measurement along outward flange extends described in mind-set from described described in innermost spiral be adjacent pitch between spiral and be greater than described outmost spiral and be adjacent the pitch between spiral.
25. circuit arrangements according to claim 20, the spirality pattern of wherein said repetition comprises innermost spiral, outmost spiral and a plurality of intermediate conveyor screw, wherein when radial measurement along the outward flange of plane winding extends described in mind-set from described plane winding described in the pitch that is adjacent between spiral of innermost spiral be greater than the pitch between any two adjacent intermediate conveyor screws.
26. circuit arrangements according to claim 20, wherein said plane winding comprises printing conductive element, spiral element or etching conducting element.
27. circuit arrangements according to claim 20, the spirality pattern of wherein said repetition is in square winding, rectangle winding, circular winding and oval winding.
28. circuit arrangements according to claim 20, it also comprises: for receiving the electric power transfer surface of at least one portable unit thereon, described plane winding is parallel to described electric power transfer surface substantially.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US201361768862P | 2013-02-25 | 2013-02-25 | |
| US61/768862 | 2013-02-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104008846A true CN104008846A (en) | 2014-08-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310118927.0A Pending CN104008846A (en) | 2013-02-25 | 2013-03-14 | Variable pitch spiral coil |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN104008846A (en) |
| TW (1) | TW201434063A (en) |
| WO (1) | WO2014130065A1 (en) |
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| CN105845404A (en) * | 2015-01-15 | 2016-08-10 | 宁波微鹅电子科技有限公司 | Transmitting coil structure with high-quality factor and winding method thereof |
| CN108717170A (en) * | 2018-05-25 | 2018-10-30 | 中国医学科学院生物医学工程研究所 | Change spacing mosquito-repellent incense-shaped coil for the excitation of magnetic inductive magnetosonic imaging magnetic field |
| CN109643607A (en) * | 2016-09-28 | 2019-04-16 | 日本电产株式会社 | Non-contact power coil unit |
| CN110168850A (en) * | 2016-09-01 | 2019-08-23 | 桑加亚·马尼克塔拉 | Segmented and longitudinal receiver coil arrangement for wireless power transfer |
| CN110888170A (en) * | 2018-09-07 | 2020-03-17 | 宏碁股份有限公司 | Detection device |
| CN110999028A (en) * | 2017-05-30 | 2020-04-10 | 动量动力学公司 | Wireless Power Transmission Thin Coil Assemblies |
| WO2023083180A1 (en) * | 2021-11-12 | 2023-05-19 | 上海微创惟美医疗科技(集团)有限公司 | Coil and winding method therefor, coil winding device, handle, and electronmagnetic generation apparatus |
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| EP3221891A4 (en) * | 2014-11-20 | 2018-08-08 | Fractal Antenna Systems Inc. | Method and apparatus for folded, rough, and/or fractal capacitors |
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| US7212414B2 (en) | 1999-06-21 | 2007-05-01 | Access Business Group International, Llc | Adaptive inductive power supply |
| US7522878B2 (en) | 1999-06-21 | 2009-04-21 | Access Business Group International Llc | Adaptive inductive power supply with communication |
| WO2009155000A2 (en) * | 2008-05-27 | 2009-12-23 | University Of Florida Research Foundation, Inc. | Method and apparatus for producing substantially uniform magnetic field |
| CN203366972U (en) * | 2011-01-26 | 2013-12-25 | 松下电器产业株式会社 | Contactless charging module and receiving-side and transmission-side contactless charger using same |
| DE102011107620A1 (en) * | 2011-06-30 | 2013-01-17 | Paul Vahle Gmbh & Co. Kg | Flat coil for contactless inductive energy transfer |
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2013
- 2013-03-14 TW TW102108964A patent/TW201434063A/en unknown
- 2013-03-14 WO PCT/US2013/031128 patent/WO2014130065A1/en active Application Filing
- 2013-03-14 CN CN201310118927.0A patent/CN104008846A/en active Pending
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| CN105845404A (en) * | 2015-01-15 | 2016-08-10 | 宁波微鹅电子科技有限公司 | Transmitting coil structure with high-quality factor and winding method thereof |
| CN105845404B (en) * | 2015-01-15 | 2017-12-12 | 宁波微鹅电子科技有限公司 | The transmitting coil structure and its winding method of a kind of high quality factor |
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| WO2023083180A1 (en) * | 2021-11-12 | 2023-05-19 | 上海微创惟美医疗科技(集团)有限公司 | Coil and winding method therefor, coil winding device, handle, and electronmagnetic generation apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2014130065A1 (en) | 2014-08-28 |
| TW201434063A (en) | 2014-09-01 |
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Application publication date: 20140827 |