CN106849376A - A kind of existing fringing field for wireless charging launches end-coil - Google Patents
A kind of existing fringing field for wireless charging launches end-coil Download PDFInfo
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- CN106849376A CN106849376A CN201710022779.0A CN201710022779A CN106849376A CN 106849376 A CN106849376 A CN 106849376A CN 201710022779 A CN201710022779 A CN 201710022779A CN 106849376 A CN106849376 A CN 106849376A
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- coil
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- existing fringing
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- 230000003071 parasitic effect Effects 0.000 claims abstract description 20
- 230000005684 electric field Effects 0.000 claims abstract description 19
- 230000000694 effects Effects 0.000 claims abstract description 11
- 230000005855 radiation Effects 0.000 claims abstract description 7
- 230000005426 magnetic field effect Effects 0.000 claims abstract description 6
- 238000003780 insertion Methods 0.000 claims description 9
- 230000037431 insertion Effects 0.000 claims description 9
- 239000003990 capacitor Substances 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 3
- 230000006698 induction Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 238000004804 winding Methods 0.000 abstract description 4
- 230000008901 benefit Effects 0.000 abstract description 3
- 238000013461 design Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 238000012360 testing method Methods 0.000 description 3
- 230000002708 enhancing effect Effects 0.000 description 2
- 230000005669 field effect Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 102220298895 rs1025502215 Human genes 0.000 description 1
- 102220092788 rs185400394 Human genes 0.000 description 1
- 102220162169 rs575633576 Human genes 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- 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
- H01F27/42—Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils
-
- 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
-
- H02J7/025—
-
- 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
- H01F2038/146—Inductive couplings in combination with capacitive coupling
Abstract
Launch end-coil the invention discloses a kind of existing fringing field for wireless charging, the existing fringing field transmitting end-coil for wireless charging introduces the tuning capacitance of the negative effect and the radiation interference for reducing EMI and RF interference (RFI) for reducing itself parasitic capacitance between each individual pen of common transmitting end-coil；The capacitance of tuning capacitance causes that one-turn coil occurs self-resonance, it is to avoid alternating voltage between the adjacent windings number of turns it is accumulative, and make to minimize the generation of electric field while the magnetic field effect of near field.The present invention provides a coil for existing fringing field for resonance type wireless charge prepd series, and advantage is smaller electric jamming, is more easy to by FCC EMI certifications, and is large area 1：N charges application there is provided stable coil.
Description
Technical field
The invention belongs to wireless charging portion of techniques field, more particularly to a kind of existing fringing field transmitting terminal for wireless charging
Coil.
Background technology
Wireless charging system based on A4WP is operated in 6.78MHz, and the coil design of its power supply transmitting terminal (PTU) is usual
The helical structure of multi-turn is needed to meet magnetic field uniformity and demand with the coupling of power supply receiving unit (PRU).Maximum chooses
War is the design of coil, particularly designs a coil for large area.Because the parasitic capacitance accumulated is low compared to being operated in
The coil of frequency or small size can be bigger, therefore energy loss also can be bigger.
In the simple circuit model and equivalent parasitic capacitances of prior art Wireless charging coil, equivalent parasitic capacitances C is represented
The summation of parasitic capacitance between coil individual pen, L represents the total inductance amount of many turn coils, and R represents the AC and DC of coil
Resistance and.After parasitic capacitance C is introduced, the equiva lent impedance of parallel LC circuit and capacitive reactance can be represented with equation below：
Because the L of coil and the resonant frequency of C in combination are far below working frequency ω, circuit equivalent resistance and inductance can be with letters
Turn to：
In this expression formula, the shunt capacitance of very little plays the role of multiplication for coil inductance and resistance.Physically
For, the shunt capacitance for adding very little introduces a current path opposite with electric current in inductance, therefore when this circuit is permanent
When stream source drives (such as most of A4WP wireless charging systems are realized), the electric current for flowing into inductance L and resistance R is (I+ Δ I), so that
Increased equivalent resistance and inductance.
Parasitic capacitance is except that can introduce the magnetic field (H-field) during energy transmission, while can also introduce very strong near field
Electric field (E-field).Very strong electric field can influence to launch the EMC certifications of end module in transmitting end-coil.Additionally, it can cause hair
The tuning for penetrating end-coil is very sensitive for extraneous close object, such as dielectric substance, hand of people etc. so that power supply transmitting terminal
System is not sufficiently stable, or even failure.
To sum up, traditional Wireless charging coil design is limited by the effect of itself parasitic capacitance so that the flexibility of position
It is restricted with power delivery distance.
Parasitic capacitance effect produces very strong electric field, the interference to receiving device can be formed, so as to influence receiving terminal to set
The standby flexibility charged；And because because EMI and the RF interference of electric field generation are bigger, therefore transmission power can be restricted, from
And influence power delivery distance.
The content of the invention
Launch end-coil it is an object of the invention to provide a kind of existing fringing field for wireless charging, it is intended to solve traditional
Wireless charging coil design is limited by the effect of itself parasitic capacitance so that the flexibility of position and electric transmission power can be limited
System, so as to influence the problem of power delivery distance.
The present invention is achieved in that a kind of existing fringing field for wireless charging launches end-coil, described for wireless charging
The existing fringing field transmitting end-coil of electricity is introduced for reducing itself parasitic capacitance between each individual pen of A4WP transmitting end-coils
The tuning capacitance of the radiation interference of negative effect and reduction EMI and RF interference (RFI)；The capacitance of tuning capacitance causes individual pen line
There is self-resonance in circle, stop adding up for the alternating voltage between the adjacent windings number of turns, and near field magnetic field effect is minimized electric field
Produce.
Further, each coil current value of tuning capacitance is identical.
Further, the production method that electric field is minimized while making near field magnetic field effect includes：
The tuning capacitance of insertion is equivalent to C by modellings1~Cs5, the inductance L with individual pen1~L5With resistance R1~R5String
Connection；
The tuning capacitance of insertion offsets the equivalent inductance on often circle so that in the induction reactance of the same position of every circle be 0；When this
When coil is driven by constant-current source, the voltage difference between every turn coil in same position is also minimum；So that returning by parasitic capacitance
Stream electric current is close to 0；The electric current for often enclosing is also identical with the electric current of constant-current source is driven；No-voltage official post near field between coil individual pen
Field effect is minimized.
The present invention provides a coil for existing fringing field for resonance type wireless charge prepd series, and advantage is electric jamming
It is smaller, it is more easy to by FCC EMI certifications, and be large area 1：N charges application there is provided stable coil.
The present invention reduces itself parasitic capacitance between the individual pen of A4WP transmitting end-coils by introducing capacitance tuning
Negative effect scheme.The capacitance of the tuning capacitance of introducing causes that one-turn coil occurs self-resonance, it is to avoid adjacent windings
Alternating voltage between the number of turns it is accumulative, so as to minimize the generation of electric field while near field magnetic field effect is ensured.This hair
It is bright at the same reduce EMI and RF interference (RFI) radiation interference.
With conventional coil current value ratio compared with the scheme that the present invention is provided ensure that by selecting suitable tuning capacitance
Per the identical (I of turn coil current value6~I10=I0).But traditional scheme is due to the accumulative effect of parasitic capacitance, in every turn coil
Very big (the I of current value1~I5-ΔI1~Δ I5=I0)。
Conventional coil is compared with existing fringing field coil in the present invention, and traditional coil only one of which shunt capacitance, the present invention is every
Tuning capacitance has all been concatenated on circle.The size of the two coils is consistent, and the Distribution of Magnetic Field uniformity at the coil 12mm that adjusts the distance
It is optimized, therefore their individual pens interval is different.
Conventional coil and two kinds of constant-current sources of the identical 6.78MHz of coil access of existing fringing field coil in the present invention, and measure near
The electric field and Distribution of Magnetic Field of field.Measurement result shows that the magnetic field intensity of two kinds of samples is about the same, but coil proposed by the present invention
Small 10 times or so are wanted compared to conventional coil electric field.The reliability of this coil for greatly enhancing, and will not more be filled easily
The influence (the such as person, equipment etc.) of electric areas adjacent object
Existing fringing field coil has carried out substantial amounts of EMI surveys by connecting valve formula power amplifier in conventional coil and the present invention
Examination is compared.Power amplifier circuit has very strong harmonic wave and broadband noise, and equivalent to a constant-current source.From both coils
The radiation interference test result of sample can be seen that base noise and 6.78MHz harmonic waves in conventional coil compared to the present invention
Coil is substantially higher by (10+dB).
The individual pen spacing of present invention transmitting end-coil may be different, the Series tuning capacitors of individual pen be likely to it is different,
And need adjust the distance transmitting end-coil certain distance magnetic field optimize so that Distribution of Magnetic Field is uniform and uniformity is good.This hair
The equivalent inductance and resistance of final coil are not exaggerated substantially in bright, and this is to the efficiency of transmission and reduce loss that improve power supply
It is helpful, and substantially without electric field.The present invention solves the problems, such as the very highfield that parasitic capacitance is produced, therefore to improving position
Flexibility and power delivery are put apart from helpful.
Brief description of the drawings
Fig. 1 is the multi-turn circuit diagram of insertion tuning capacitance provided in an embodiment of the present invention.
Fig. 2 is the multi-circle spiral flow coil simple equivalent circuit figure of insertion tuning capacitance provided in an embodiment of the present invention.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
Existing fringing field for wireless charging provided in an embodiment of the present invention launches end-coil, in the every of A4WP transmitting end-coils
The negative effect for reducing itself parasitic capacitance is introduced between individual individual pen and the radiation interference of EMI and RF interference (RFI) is reduced
Tuning capacitance；The capacitance of tuning capacitance causes that one-turn coil occurs self-resonance, it is to avoid the exchange between the adjacent windings number of turns
Voltage it is accumulative, and make near field magnetic field effect minimize electric field to produce.
Below in conjunction with the accompanying drawings and specific embodiment the present invention is described in detail.
Fig. 1 is one embodiment of the present of invention example, and it inserts tuning capacitance in the middle of every turn coil.This coil etc.
Effect circuit model is as shown in Fig. 2 the tuning capacitance of insertion is equivalent to (C by modellings1~Cs5), the inductance (L with individual pen1~
L5) and resistance (R1~R5) series connection.For conventional coil dimension, Series tuning capacitors (Csn) uniformity is unsatisfactory, it is necessary to logical
Cross EM emulation to optimize, to put it more simply, be made below assuming：The equivalent inductance often enclosed, resistance and electric capacity are：
(L1=L2=L3=L4=L5=3uH, C12=C23=C34=C45=10pF, R1=R2=R3=R4=R5
=0.1Ohm),
The often circle resonant capacitance value of insertion is identical (Cs1=Cs2=Cs3=Cs4=Cs5=~180pF).
The purpose of the tuning capacitance of insertion be offset often circle on equivalent inductance so that every circle same position (such as
V1 in Fig. 1, V2 ... V5 points) induction reactance be 0. therefore, when this coil is driven by constant-current source, per turn coil between in same position
Voltage difference it is also minimum.So also cause by back flow current (the Δ I of parasitic capacitance6~Δ I9) also close to being 0, the electricity for often enclosing
Flow also (I identical with the electric current of driving constant-current source0).Zero-voltage difference between coil individual pen ensure that the minimum of near field field effect
Change.The equivalent inductance and resistance of whole coil are approximately the inductance and resistance value of individual pen and simple summation
15u H and 0.5Ohm), compared to conventional coil, this value greatly reduces.
From equivalent-circuit model in the voltage's distribiuting simulation result of V1~V5 points, tuning capacitance is concatenated by reasonable selection
Value, under 6.78MHz frequencies, the potential difference of identical point is almost 0 between coil individual pen, so as to the electric field that is produced near field also most
It is small.The scheme that the present invention is provided ensure that the identical (I of every turn coil current value by selecting suitable tuning capacitance6~I10=
I0).But traditional scheme is due to the accumulative effect of parasitic capacitance, the very big (I of current value in every turn coil1~I5-ΔI1~Δ I5=
I0)。
Only one of which shunt capacitance in conventional coil, the present invention is often enclosed and has concatenated tuning capacitance.The two coils
Size is consistent, and the Distribution of Magnetic Field uniformity coil 12mm that adjusts the distance at is optimized, thus their individual pens be spaced it is different.
The constant-current source of conventional coil and the identical 6.78MHz of two kinds of coils access of the invention, and measure near field electric field and
Distribution of Magnetic Field.Measurement result shows that the magnetic field intensity of two kinds of samples is about the same, but coil proposed by the present invention is compared to tradition
Coil electric field wants small 10 times or so.The reliability of this coil for greatly enhancing, and will not more be subject near charged area easily
The influence (the such as person, equipment etc.) of object
Same two kinds of coils using in conventional coil and the present invention, have been carried out greatly by connecting valve formula power amplifier
The EMI test and comparisons of amount.Power amplifier circuit has very strong harmonic wave and broadband noise, and equivalent to a constant-current source.From
The radiation interference test result of both coils can be seen that base noise and 6.78MHz harmonic waves in conventional coil compared to
Coil of the present invention is substantially higher by (10+dB).
Presently preferred embodiments of the present invention is the foregoing is only, is not intended to limit the invention, it is all in essence of the invention
Any modification, equivalent and improvement made within god and principle etc., should be included within the scope of the present invention.
Claims (3)
1. a kind of existing fringing field for wireless charging launches end-coil, it is characterised in that the existing fringing field for wireless charging
Transmitting end-coil reduces the electric field shadow produced by parasitic capacitance in each individual pen Series tuning capacitors of common transmitting end-coil
Ring, and reduce the radiation interference of EMI and RF；The capacitance of tuning capacitance causes that one-turn coil occurs self-resonance, stops adjacent lines
Alternating voltage between the circle number of turns it is accumulative, and make near field magnetic field effect minimize electric field to produce.
2. the as claimed in claim 1 existing fringing field transmitting end-coil for being used for wireless charging, it is characterised in that tuning capacitance each
Coil current value is identical.
3. the existing fringing field for being used for wireless charging as claimed in claim 1 launches end-coil, it is characterised in that imitate near field magnetic field
Electric field production method should be minimized to be included：
The tuning capacitance of insertion is equivalent to C by modellings1~Cs5, the inductance L with individual pen1~L5With resistance R1~R5Series connection；
The tuning capacitance of insertion offsets the equivalent inductance on often circle so that in the induction reactance of the same position of every circle be 0；When this coil
When being driven by constant-current source, the voltage difference between every turn coil in same position is also minimum；So that the backflow electricity for passing through parasitic capacitance
Stream is close to 0；The electric current for often enclosing is also identical with the electric current of constant-current source is driven；No-voltage official post near field electric field between coil individual pen
Effect is minimized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710022779.0A CN106849376A (en) | 2017-01-12 | 2017-01-12 | A kind of existing fringing field for wireless charging launches end-coil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710022779.0A CN106849376A (en) | 2017-01-12 | 2017-01-12 | A kind of existing fringing field for wireless charging launches end-coil |
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| CN106849376A true CN106849376A (en) | 2017-06-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110506379A (en) * | 2017-04-07 | 2019-11-26 | Abb瑞士股份有限公司 | System and high-voltage circuitbreaker for the wireless power transmitting between low potential and high potential |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1420363A (en) * | 1996-06-27 | 2003-05-28 | 皇家菲利浦电子有限公司 | RF coil system for magnetic resonance image forming device |
| CN103580300A (en) * | 2012-08-03 | 2014-02-12 | 联发科技（新加坡）私人有限公司 | Receiver and method for executing operation of receiver |
| US20160181853A1 (en) * | 2014-12-23 | 2016-06-23 | Intel Corporation | Low emission coil topology for wireless charging |
-
2017
- 2017-01-12 CN CN201710022779.0A patent/CN106849376A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1420363A (en) * | 1996-06-27 | 2003-05-28 | 皇家菲利浦电子有限公司 | RF coil system for magnetic resonance image forming device |
| CN103580300A (en) * | 2012-08-03 | 2014-02-12 | 联发科技（新加坡）私人有限公司 | Receiver and method for executing operation of receiver |
| US20160181853A1 (en) * | 2014-12-23 | 2016-06-23 | Intel Corporation | Low emission coil topology for wireless charging |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110506379A (en) * | 2017-04-07 | 2019-11-26 | Abb瑞士股份有限公司 | System and high-voltage circuitbreaker for the wireless power transmitting between low potential and high potential |
| US11031819B2 (en) | 2017-04-07 | 2021-06-08 | Abb Power Grids Switzerland Ag | System for wireless power transfer between low and high electrical potential, and a high voltage circuit breaker |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170613 |
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