CN109462292A - A kind of idle screen method of resonance and system of plane radio electrical power transmission system - Google Patents
A kind of idle screen method of resonance and system of plane radio electrical power transmission system Download PDFInfo
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- CN109462292A CN109462292A CN201811132545.2A CN201811132545A CN109462292A CN 109462292 A CN109462292 A CN 109462292A CN 201811132545 A CN201811132545 A CN 201811132545A CN 109462292 A CN109462292 A CN 109462292A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/70—Circuit arrangements or systems for wireless supply or distribution of electric power involving the reduction of electric, magnetic or electromagnetic leakage fields
Abstract
The present invention relates to the idle screen methods of resonance and system of a kind of plane radio electrical power transmission system, this method comprises: shielded coil is arranged in the coil periphery in Wireless power transmission system, the matching capacitance for adjusting shielded coil capacitance is provided in shielded coil；Induced voltage is generated in shielded coil using the magnetic flux leakage that the coil itself of Wireless power transmission system generates, to generate electric current in shielded coil；The size of shielded coil and the capacitance of matching capacitance are adjusted, flows through the elimination magnetic field of the electric current generation and magnetic flux leakage opposite direction in shielded coil, the elimination magnetic field is cancelled out each other with the magnetic flux leakage, to reduce magnetic flux leakage.The idle shielding harness of resonance of plane radio electrical power transmission system proposed by the invention, structure is simple, additional source shield coil and load shielded coil size are small and be all passive element, and the reduction of insignificant power transmission efficiency can be applied in other mobile applications.
Description
Technical field
The present invention relates to wireless power transmission fields, and in particular to a kind of resonance of plane radio electrical power transmission system is idle
Screen method and system.
Background technique
Wireless power transmission (WPT) is from power delivery to load by electric power without the use of electric conductor, and transimission power is not necessarily to
The process of conductive cable has a long history, since NikolaTesla (Ni Gula tesla), but practical WPT application
Most of technological progress occurs in recent years, although the mobile device of WPT technology is becoming increasingly popular, WPT system is produced
There is following disadvantages in raw electromagnetic field (EMF) solution:
1. the safety of couple user constitutes potential danger: the EMF of transmitting and receiving coil generation generates electric current and heat in vivo
Amount, can lead to nerve, muscle and tissue are stimulated and the variation of central nervous system.
2. existing screen method redundancy is big: many screen methods meet the regulation leaked about the EMF of WPT system, including
Using ferromagnetic material, conductive shield and actively cancel, still, these screen methods usually require to increase space, weight, cost and
Power consumption.
Summary of the invention
In order to solve the above technical problems, as an aspect of of the present present invention, a kind of plane radio electrical power transmission system is provided
Resonate idle screen method, including following step:
Step 1, in the shielded coil that the coil periphery setting of Wireless power transmission system is in closed loop, the shielded coil
It is in series with the matching capacitance for adjusting shielded coil capacitance；
Step 2, induction is generated in shielded coil using the magnetic flux leakage that the coil of Wireless power transmission system itself generates
Voltage, to generate electric current in shielded coil；
Step 3, by adjusting the size of shielded coil and the capacitance of matching capacitance, the electric current in shielded coil is flowed through
The elimination magnetic field with magnetic flux leakage opposite direction is generated, magnetic flux leakage described in the elimination magnetic field cancellation is passed through.
Further, the coil of the Wireless power transmission system includes source electrode coil and loading coil, the shielding line
Circle includes in the source shield coil of closed loop and the load shielded coil in closed loop, and the source shield coil is set to the source
The periphery of polar curve circle, the load shielded coil are set to the periphery of loading coil, the source shield coil and load shielding
The matching capacitance for adjusting corresponding coil capacitance is in series in coil；
The magnetic flux leakage generated in the source electrode coil and loading coil produces in source shield coil and load shielded coil
Raw induced voltage generates electric current in source shield coil and load shielded coil by the induced voltage；
By adjusting the capacitance of the size and Corresponding matching capacitor of source shield coil and load shielded coil, make to flow through
Electric current in source shield coil and load shielded coil generates the elimination magnetic field with magnetic flux leakage opposite direction, the elimination magnetic field
Offset the magnetic flux leakage generated in the source electrode coil and loading coil.
Further, the source shield coil and the source electrode coil are homocentric coplanar, the load shielded coil and institute
It is homocentric coplanar to state loading coil.
Further, the capacitance of the adjustment matching capacitance specifically:
The size for adjusting the matching capacitance of source shield coil makes the impedance of the capacitor in source shield coil be less than source electrode
The impedance of inductance in shielded coil；
The size of the matching capacitance of adjustment load shielded coil, makes the impedance for loading the capacitor in shielded coil be less than load
The impedance of inductance in shielded coil.
Further, the current phase of the electric current of the source electrode coil and loading coil differs 90 degree.
As an aspect of of the present present invention, a kind of idle shielding harness of resonance of plane radio electrical power transmission system is provided, is wrapped
Wireless power transmission system and the shielded coil in closed loop are included, the shielded coil is set to the coil of Wireless power transmission system
Periphery is in series with the matching capacitance for adjusting shielded coil capacitance in the shielded coil；
The shielded coil is used to generate induced voltage using the magnetic flux leakage of the coil itself of Wireless power transmission system, from
And electric current is generated in shielded coil, by adjusting the size of shielded coil and the capacitance of matching capacitance, flow through shielding line
Electric current in circle generates the elimination magnetic field with magnetic flux leakage opposite direction, source electrode coil and load line described in the elimination magnetic field cancellation
The magnetic flux leakage generated in circle.
Further, the coil of the Wireless power transmission system includes source electrode coil and loading coil, the shielding line
Circle includes being set to the source electrode coil in the source shield coil and load shielded coil, the source shield coil of closed loop
Periphery, the load shielded coil are set to the periphery of the loading coil, the source shield coil and load shielded coil
In be in series with and obtain matching capacitance for adjusting corresponding coil capacitance；
Magnetic flux leakage is generated in the source electrode coil and loading coil, the magnetic flux leakage is in the source shield coil and load
Induced voltage is generated in shielded coil, and electricity is generated in source shield coil and load shielded coil by the induced voltage
Stream；
By adjusting the capacitance of the size and Corresponding matching capacitor of source shield coil and load shielded coil, make to flow through
Electric current in source shield coil and load shielded coil generates the elimination magnetic field with magnetic flux leakage opposite direction, the elimination magnetic field
The magnetic flux leakage generated in the source electrode coil and loading coil is offset, to reduce magnetic flux leakage, realizes Wireless power transmission system
The idle shielding of resonance.
Further, the source shield coil and the source electrode coil are homocentric coplanar, the load shielded coil and institute
It is homocentric coplanar to state load shielded coil.
Further, the source shield coil, the source electrode coil, the load shielded coil and the loading coil
In corresponding resistance, capacitor and inductance be equal.
Further, the current phase of the electric current of the source electrode coil and loading coil differs 90 degree.
Beneficial effects of the present invention:
The present invention is provided with the source shield coil of matching capacitance in source electrode coil periphery, is arranged in loading coil periphery
Load shielded coil with matching capacitance is generated using source shield coil and load shielded coil and eliminates magnetic field, described
It eliminates the magnetic field that magnetic field is generated with source electrode coil and loading coil to cancel out each other, to reduce magnetic flux leakage, be come from significant reduction
The magnetic flux leakage of WPT system, in addition, the idle shielding harness of resonance of plane radio electrical power transmission system proposed by the invention, knot
Structure is simple, additional source shield coil and load shielded coil size it is small and all be passive element, insignificant power transmission
The reduction of efficiency can be applied in other mobile applications.
Detailed description of the invention
Fig. 1 is method flow schematic diagram proposed by the invention；
Fig. 2 is the topological structure schematic diagram that system proposed by the invention designs；
Fig. 3 is the magnetic direction schematic diagram that system proposed by the invention generates；
Fig. 4 is the phasor schematic diagram for the magnetic flux that system proposed by the invention generates；
The positional diagram of shielded coil and source electrode coil and loading coil Fig. 5 proposed by the invention
The equivalent-circuit model schematic diagram of system Fig. 6 proposed by the invention；
The another location relation schematic diagram of shielded coil and source electrode coil and loading coil Fig. 7 proposed by the invention；
The Distribution of Magnetic Field schematic diagram of Fig. 8 resonance frequency amplitude and phase proposed by the invention based on shielded coil；
The amplitude schematic diagram in the magnetic field of system Fig. 9 proposed by the invention.
Specific embodiment
Principles and features of the present invention are described below in conjunction with example, the given examples are served only to explain the present invention, and
It is non-to be used to limit the scope of the invention.
Fig. 1 is method flow schematic diagram proposed by the invention, as shown in Figure 1, a kind of plane radio electrical power transmission system
The idle screen method of resonance, comprising the following steps:
Step 1, in the shielded coil that the coil periphery setting of Wireless power transmission system is in closed loop, the shielded coil
It is in series with the matching capacitance for adjusting shielded coil capacitance；
Step 2, induction is generated in shielded coil using the magnetic flux leakage that the coil of Wireless power transmission system itself generates
Voltage, to generate electric current in shielded coil；
Step 3, by adjusting the size of shielded coil and the capacitance of matching capacitance, the electric current in shielded coil is flowed through
The elimination magnetic field with magnetic flux leakage opposite direction is generated, the elimination magnetic field is cancelled out each other with the magnetic flux leakage, passes through the elimination
Magnetic flux leakage described in magnetic field cancellation realizes the idle shielding of the resonance of Wireless power transmission system to reduce magnetic flux leakage.
Preferably, the coil of the Wireless power transmission system includes source electrode coil and loading coil, the shielded coil
Including in closed loop source shield coil and and in closed loop load shielded coil, the source shield coil is set to the source
The periphery of polar curve circle, the load shielded coil are set to the periphery of loading coil, the source shield coil and load shielding
The matching capacitance for adjusting corresponding coil capacitance is in series in coil；
The magnetic flux leakage generated in the source electrode coil and loading coil produces in source shield coil and load shielded coil
Raw induced voltage generates electric current in source shield coil and load shielded coil by the induced voltage；
By adjusting the capacitance of the size and Corresponding matching capacitor of source shield coil and load shielded coil, make to flow through
Electric current in source shield coil and load shielded coil generates the elimination magnetic field with magnetic flux leakage opposite direction, the elimination magnetic field
The magnetic flux leakage generated in the source electrode coil and loading coil is offset, to reduce magnetic flux leakage, realizes Wireless power transmission system
The idle shielding of resonance.
Preferably, the source shield coil and the source electrode coil are homocentric coplanar, the load shielded coil with it is described
Loading coil is homocentric coplanar, i.e., the central point of the described source shield coil and the center of the source electrode coil are in same position
And the upper surface of the source shield coil and the upper surface of the source electrode coil are in same plane, the load shielding line
Circle center point and the loading coil center are born in the upper surface of same position and the load shielded coil with described
The upper surface for carrying coil is in same plane.
Preferably, the capacitance of the adjustment matching capacitance specifically:
The size for adjusting the matching capacitance of source shield coil makes the impedance of the capacitor in source shield coil be less than source electrode
The impedance of inductance in shielded coil；
The size of the matching capacitance of adjustment load shielded coil, makes the impedance for loading the capacitor in shielded coil be less than load
The impedance of inductance in shielded coil.
Preferably, the current phase of the electric current of the source electrode coil and loading coil differs 90 degree.
The present invention is provided with the source shield coil of matching capacitance in source electrode coil periphery, is arranged in loading coil periphery
Load shielded coil with matching capacitance is generated using source shield coil and load shielded coil and eliminates magnetic field, described
It eliminates the magnetic flux leakage that magnetic field is generated with source electrode coil and loading coil to cancel out each other, to reduce magnetic flux leakage, be come with significant reduction
From the magnetic flux leakage of WPT system, in addition, the idle shielding harness of resonance of plane radio electrical power transmission system proposed by the invention,
Structure is simple, and additional source shield coil and load shielded coil size are small and be all passive element, and insignificant power passes
The reduction of defeated efficiency can be applied in other mobile applications.
Fig. 2 is the topological structure schematic diagram that system proposed by the invention designs, as shown in Fig. 2, source shield coil is
The closed loop of electric conductor around source electrode coil, load shielded coil are the closed loops of the electric conductor around loading coil,
It is all in series with matching capacitance in the source shield coil and load shielded coil, is produced using source electrode coil and loading coil periphery
Raw magnetic flux leakage generates induced voltage in source shield coil and load shielded coil, by the induced voltage in source electrode screen
It covers in coil and load shielded coil and generates electric current, the electric current for flowing through source shield coil and loading in shielded coil generates and leakage
The opposite elimination magnetic field of magnetic direction.
If the magnetic field that WPT coil generates is by source electrode coil and to bear without source shield coil and load shielded coil
Carry what coil determined, as shown in Fig. 3 (a)；
As shown in Fig. 3 (b), source shield coil and load shielded coil are set in WPT coil, by adjusting matching electricity
The capacitance size of appearance, makes source shield coil generate the electric current with source electrode coil current opposite in phase, and load shielded coil generates
With the electric current of loading coil opposite in phase, the electric current for flowing through shielded coil, which generates, eliminates magnetic field, to reduce magnetic flux leakage.
Specifically, can be by adjusting matching capacitance, so that the self-resonant frequency ω of shielded coil is less than the work of WPT system
The self-resonant frequency of working frequency, shielded coil can indicate are as follows:
Wherein LShIt is the parasitic inductance of shielded coil, CShFor matching capacitance and shielded coil itself generate parasitic capacitance it
With change the self-resonant frequency of the i.e. changeable shielded coil of the size of matching capacitance.
In addition, the phase difference between electric current in source electrode coil and loading coil should be 90 ° for maximum power transmitting,
In the case, when being not provided with shielded coil the total magnetic field of Wireless power transmission system can be expressed as by source electrode coil and
The summation in the magnetic field that loading coil generates, as Fig. 4 (a) show the Wireless power transmission system when being not provided with shielded coil
Total magnetic field is expressed as the first formula:
WhereinFor source electrode coil generate magnetic field,The magnetic field generated for loading coil.
When shielded coil is added on WPT coil, the sum of three magnetic field that total leakage field is generated by three current components
It determines: being respectively the magnetic field that source electrode coil current generates, what the magnetic field and shielded coil electric current that loading coil electric current generates generated
Magnetic field, as shown in Fig. 4 (b), it is therefore proposed that coil former total leakage field, be expressed as the second formula
WhereinFor source shield coil generate magnetic field,It is generated for load shielded coil
Magnetic field,
As shown in the second formula, if shielded coil generates the magnetic for having same magnitude and 180 ° of phase differences with the first formula
, then it is preferably zero in total leakage field of given viewpoint, therefore, generating elimination magnetic field appropriate is in shielded coil design
Most important aspect.
The position of shielded coil is also important for increasing shielding properties, because magnetic vector becomes according to the position of coil
Change, it is preferable that the source shield coil is ceoncentrically wound coil and the upper table of the source shield coil with the source electrode coil
The upper surface of face and the source electrode coil be in same plane, the load shielded coil and loading coil for ceoncentrically wound coil and
The upper surface of the load shielded coil and the upper surface of the loading coil are in same plane.
As shown in figure 5, as the preferred embodiment of the present invention, the overall diameter of the loading coil and source electrode coil is
60mm, the vertical height between the loading coil and source electrode coil is 30mm, and the load shielded coil is with loading coil
The ceoncentrically wound coil of same level, the source shield coil and source electrode coil are also the ceoncentrically wound coil of same level, described
The overall diameter for loading shielded coil and source shield coil is 70mm, and interior diameter is 68mm.
As shown in Fig. 6 (a), generate induced magnetic field mutually between four coils, wherein Fig. 4 (b) be in order to analyze, taking-up
Single shielded coil, the coil of Fig. 6 (b) can be source shield coil or load shielded coil, as shown in Fig. 6 (b), shielding line
Circle is characterized in that being made of parasitic inductance Lsh, dead resistance Rsh and the sum of matching capacitance and parasitic capacitance Csh equivalent
Circuit model, the size and phase of electric current, the impedance of shielded coil should select with caution in shielded coil impedance control shielded coil,
Shielded coil electric current has determined shield effectiveness and efficiency of transmission.
In order to control the size and current phase of the electric current in shielded coil, matched capacitor is added to shielded coil
On, when the voltage on each shielded coil of the flux of magnetic induction generated from WPT coil, each shielded coil (Vind) on induction
Voltage is as follows, is expressed as third formula:
Vind=-j ω Mi1,
Wherein ω is angular frequency, and M is the mutual inductance between two coils, i1It is the electric current flowed in WPT coil, by WPT
The electric current that the magnetic flux that coil generates incudes in shielded coil is as follows, is expressed as the 4th formula:
Loading coil topological structure is symmetrical in WPT system, and the impedance of shielded coil is also identical, i.e. shielding line
Impedance on circle, loading coil and source electrode coil is identical, and respective resistance, capacitor and inductance are also all equal, therefore, source electrode
The electric current of coil and load shielded coil is described by identical equation.
As shown in fig. 7, the shielded coil with matching capacitance is the peripheral equipment of source electrode and loading coil, shielded coil
Matching capacitance determines the resonance frequency and impedance of shielded coil.
The size in the magnetic field generated by source electrode coil and load shielded coil is shown as shown in Figure 8, when shielded coil is humorous
When vibration frequency is close to working frequency (6.78MHz), the electric current in shielded coil increases.
In region 2, the resonance frequency of shielded coil is higher than working frequency, as shown in Fig. 8 (a), in this region, shielding
Coil capacity is greater than shielded coil inductance.The impedance value of shielded coil indicates by Zsh=1/ (j ω Ceq)+Rsh, wherein shielding line
The equivalent capacity of circle Ceq is expressed as 1/Ceq=(1/Csh- ω 2Lsh), it is assumed that 1/ ω Ceq > Rsh, then the 4th formula can be changed into
Following 5th formula:
In this region, shielded coil generates magnetic field identical with magnetic flux leakage, as shown in Fig. 8 (b).Therefore, by shielding line
It encloses the magnetic field generated and eliminates it for leakage field is increased.
In contrast, in zone 1, the resonance frequency of shielded coil is lower than working frequency, at this time the inductance of shielded coil
Lsh is greater than the capacitor of shielded coil Csh, and the impedance of shielded coil can be replaced by Zsh=j ω Leq+Rsh, wherein Leq=
Lsh-1/ ω 2Csh, if Rsh > L ω Leq, the 4th formula can be changed into following 6th formula:
In this region, as shown in Fig. 8 (b), the electric current in shielded coil generates the magnetic field in the direction opposite with magnetic flux leakage,
The resonance frequency of shielded coil should be lower than working frequency to eliminate magnetic flux leakage.
In order to design the shielded coil with best shielding properties, by adjusting the size and matching capacitance of shielded coil
Capacitance, make the magnetic field generated by shielded coil is in opposite direction with magnetic flux leakage, but identical as the amplitude of magnetic flux leakage.
Consider shielded coil resonance frequency, consider the amplitude and phase in magnetic field total leakage field can with as shown in figure 9,
The resonance frequency coil of shielded coil should be lower than working frequency, to reduce magnetic flux leakage.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of idle screen method of resonance of plane radio electrical power transmission system, which comprises the following steps:
Step 1, it connects in the shielded coil that the coil periphery setting of Wireless power transmission system is in closed loop, the shielded coil
There is the matching capacitance for adjusting shielded coil capacitance；
Step 2, induced voltage is generated in shielded coil using the magnetic flux leakage that the coil of Wireless power transmission system itself generates,
To generate electric current in shielded coil；
Step 3, by adjusting the size of shielded coil and the capacitance of matching capacitance, the electric current flowed through in shielded coil is generated
With the elimination magnetic field of magnetic flux leakage opposite direction, pass through magnetic flux leakage described in the elimination magnetic field cancellation.
2. the idle screen method of resonance of plane radio electrical power transmission system according to claim 1, which is characterized in that institute
The coil for stating Wireless power transmission system includes source electrode coil and loading coil, and the shielded coil includes the source electrode screen in closed loop
Coil and the load shielded coil in closed loop are covered, the source shield coil is set to the periphery of the source electrode coil, described negative
The periphery that shielded coil is set to loading coil is carried, is in series in the source shield coil and load shielded coil for adjusting
The matching capacitance of whole corresponding coil capacitance；
The magnetic flux leakage generated in the source electrode coil and loading coil generates sense in source shield coil and load shielded coil
Voltage is answered, electric current is generated in source shield coil and load shielded coil by the induced voltage；
By adjusting the capacitance of the size and Corresponding matching capacitor of source shield coil and load shielded coil, make to flow through source electrode
Electric current in shielded coil and load shielded coil generates the elimination magnetic field with magnetic flux leakage opposite direction, the elimination magnetic field cancellation
The magnetic flux leakage generated in the source electrode coil and loading coil.
3. the idle screen method of resonance of plane radio electrical power transmission system according to claim 2, which is characterized in that institute
It states source shield coil and the source electrode coil is homocentric coplanar, the load shielded coil and the loading coil are homocentric coplanar.
4. the idle screen method of resonance of plane radio electrical power transmission system according to claim 3, which is characterized in that institute
State the capacitance of adjustment matching capacitance specifically:
The size for adjusting the matching capacitance of source shield coil makes the impedance of the capacitor in source shield coil be less than source shield
The impedance of inductance in coil；
The size of the matching capacitance of adjustment load shielded coil, makes the impedance for loading the capacitor in shielded coil be less than load shielding
The impedance of inductance in coil.
5. the idle screen method of resonance of plane radio electrical power transmission system according to claim 2, which is characterized in that institute
The current phase of the electric current and loading coil of stating source electrode coil differs 90 degree.
6. a kind of idle shielding harness of resonance of plane radio electrical power transmission system, including Wireless power transmission system, feature
It is, further includes the shielded coil in closed loop, the shielded coil is set to the coil periphery of Wireless power transmission system, described
The matching capacitance for adjusting shielded coil capacitance is in series in shielded coil；
The shielded coil is used to generate induced voltage using the magnetic flux leakage of the coil itself of Wireless power transmission system, thus
Electric current is generated in shielded coil, by adjusting the size of shielded coil and the capacitance of matching capacitance, is flowed through in shielded coil
Electric current generate with the elimination magnetic field of magnetic flux leakage opposite direction, the elimination magnetic field is cancelled out each other with the magnetic flux leakage, to subtract
Small magnetic flux leakage realizes the idle shielding of the resonance of Wireless power transmission system.
7. the idle shielding harness of resonance of plane radio electrical power transmission system according to claim 6, which is characterized in that institute
The coil for stating Wireless power transmission system includes source electrode coil and loading coil, and the shielded coil includes the source electrode screen in closed loop
Coil and load shielded coil are covered, the source shield coil is set to the periphery of the source electrode coil, the load shielding line
Circle is set to the periphery of the loading coil, is in series in the source shield coil and load shielded coil for adjustment pair
Coil capacitance is answered to obtain matching capacitance；
Magnetic flux leakage is generated in the source electrode coil and loading coil, the magnetic flux leakage is in the source shield coil and load shielding
Induced voltage is generated in coil, and electric current is generated in source shield coil and load shielded coil by the induced voltage；
By adjusting the capacitance of the size and Corresponding matching capacitor of source shield coil and load shielded coil, make to flow through source electrode
Electric current in shielded coil and load shielded coil generates the elimination magnetic field with magnetic flux leakage opposite direction, the elimination magnetic field and source
The magnetic field generated in polar curve circle and loading coil is cancelled out each other, to reduce magnetic flux leakage, realizes being total to for Wireless power transmission system
It shakes idle shielding.
8. a kind of idle shielding harness of resonance of plane radio electrical power transmission system according to claim 7, feature exist
In the source shield coil and the source electrode coil are homocentric coplanar, the load shielded coil and the load shielded coil
It is homocentric coplanar.
9. a kind of idle shielding harness of resonance of plane radio electrical power transmission system according to claim 8, feature exist
In the source shield coil, the source electrode coil, the corresponding electricity loaded in shielded coil and the loading coil
Resistance, capacitor and inductance are equal.
10. a kind of idle shielding harness of resonance of plane radio electrical power transmission system according to claim 8, feature exist
In the electric current of the source electrode coil and the current phase of loading coil differ 90 degree.
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| CN113436867B (en) * | 2021-07-14 | 2023-08-29 | 上海电机学院 | Magnetic shielding coil assembly for wireless charging of electric automobile |
| CN113890206A (en) * | 2021-10-22 | 2022-01-04 | 西南交通大学 | Induction type WPT (Windows presentation technology) bilateral LCLC (liquid Crystal display) topology for shielding peripheral magnetic field and parameter design method thereof |
| CN113890206B (en) * | 2021-10-22 | 2023-03-21 | 西南交通大学 | Induction type WPT (Windows presentation technology) bilateral LCLC (liquid Crystal display) topology for shielding peripheral magnetic field and parameter design method thereof |
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