CN204290505U - A kind of wireless energy transfer structure of four coil electromagnetism resonant modes - Google Patents

Abstract

The utility model discloses a kind of wireless energy transfer structure of four coil electromagnetism resonant modes, comprise power supply resonant tank, launch resonant tank, receive resonant tank and loaded resonant tank, described power supply resonant tank is by power coil, the internal resistance of source, power supply, first resonant capacitance and the first resistance are followed in series to form, described transmitting resonant tank is by transmitting coil, second resonant capacitance and the second resistance are followed in series to form, described reception resonant tank is by receiving coil, 3rd resonant capacitance and the 3rd resistance are followed in series to form, described loaded resonant tank is by loading coil, 4th resonant capacitance, 4th resistance and load are followed in series to form, described power coil and transmitting coil adopt the mode of Double-wire parallel wound to be coiled into a twin coil, described transmitting coil and receiving coil are of coupled connections, described receiving coil and loading coil are of coupled connections.This practicality has the advantage of energy transmission efficiency height and applied range, can be widely used in field of energy transfer.

Description

A kind of wireless energy transfer structure of four coil electromagnetism resonant modes

Technical field

The utility model relates to field of energy transfer, especially a kind of wireless energy transfer structure of four coil electromagnetism resonant modes.

Background technology

Although the power transmission mode adopting wire to transmit electric energy has the advantage that connection is simple, transmission efficiency is high, also there is following shortcoming: (1) transfer wire broken skin easily causes short trouble; (2) contact friction of socket and plug is easily lit a fire and causes fire, leaves potential safety hazard to the special industry such as oil, chemical industry; (3) for the environment closed, isolated island or the base station working in the hilltop, wire connects difficulty, is difficult to the transmission realizing wired electric energy.There is many problems in visible wired Energy Transfer, such as safe not, very flexible, applied environment are limited and take resource etc.If the mode that can connect with non-wire realizes the transmission of energy, then can expand the application of electric equipment further.Have based on this, wireless energy transmission technology arises at the historic moment.

According to transporting mechanism, current wireless transmission is mainly divided into three kinds of modes: induction, electromagnetic radiation formula and electromagnetic resonance.Induction wireless energy transmission technology comparative maturity, but transmission range is very near, and mostly be grade, transmission range is very limited; For electromagnetic radiation formula wireless energy transmission technology, due to the aspect such as electromagnetic radiative losses, antenna size, the efficiency of which and power are very low, only can transmit the power of milliwatt or watt level.The wireless energy transmission technology of electromagnetic resonance overcomes the deficiency of above two kinds of transmission meanss, has the advantages such as long transmission distance, efficiency is high, power is large, becomes the study hotspot of field of wireless transmission.

Since electromagnetic resonance wireless energy transfer system comes out, experienced by continuous research and development, four loop constructions become the study hotspot in this field gradually.But the design of four loop constructions of the current wireless energy transmission technology to electromagnetic resonance mode is scarcely out of swaddling-clothes, not mature enough.In four current loop constructions, power coil and transmitting coil need maintain a certain distance, and cause the coupling coefficient of power coil and transmitting coil less, cannot ensure the energy transmission efficiency of system, the space of simultaneously also causing system to take is comparatively large, limits systematic difference occasion.

Utility model content

In order to solve the problems of the technologies described above, the purpose of this utility model is: provide a kind of energy transmission efficiency height and applied range, the wireless energy transfer structure of four coil electromagnetism resonant modes.

The utility model solves the technical scheme that its technical problem adopts:

A kind of wireless energy transfer structure of four coil electromagnetism resonant modes, comprise power supply resonant tank, launch resonant tank, receive resonant tank and loaded resonant tank, described power supply resonant tank is by power coil, the internal resistance of source, power supply, first resonant capacitance and the first resistance are followed in series to form, described transmitting resonant tank is by transmitting coil, second resonant capacitance and the second resistance are followed in series to form, described reception resonant tank is by receiving coil, 3rd resonant capacitance and the 3rd resistance are followed in series to form, described loaded resonant tank is by loading coil, 4th resonant capacitance, 4th resistance and load are followed in series to form, described power coil and transmitting coil adopt the mode of Double-wire parallel wound to be coiled into a twin coil, described transmitting coil and receiving coil are of coupled connections, described receiving coil and loading coil are of coupled connections.

Further, described power coil and transmitting coil adopt the mode of Double-wire parallel wound to be coiled into a twin coil.

Further, the coiling of described receiving coil is identical with arbitrary burst of coiling in twin coil, and described receiving coil is independently positioned between transmitting coil and loading coil.

Further, the coiling of described loading coil is identical with arbitrary burst of coiling in twin coil, after described loading coil is independently positioned over receiving coil.

Further, the distance d of described receiving coil and loading coil ₃₄meet:

$d_{34}=\sqrt{{\left(\frac{{\mathrm{\μ}}_0\mathrm{\π}{N}^2{r}^4}{2k_{34}L}\right)}^{2/3}-r^2},$

Wherein, L is the inductance value of receiving coil and loading coil, and N is the number of turn of receiving coil and loading coil, and r is the coil radius of receiving coil and loading coil, μ ₀for air permeability, k34 is the Best Coupling coefficient of take-up circle and loading coil.

The beneficial effects of the utility model are: power coil and transmitting coil adopt the mode of Double-wire parallel wound to be coiled into a twin coil, shorten the distance of power coil and transmitting coil, farthest increase the coupling coefficient of power coil and transmitting coil, improve the energy transmission efficiency of system; Meanwhile, adopt two coil configuration, also reduce the size of system, make system configuration compacter, overcome because system takes up room too large and defect that is that cannot use in some occasions, effectively expand systematic difference occasion.Further, the appropriate design distance of receiving coil and loading coil, avoids the situation occurring causing efficiency obviously to reduce because transmission range is comparatively large, further ensures the efficiency of transmission of system.

Accompanying drawing explanation

Below in conjunction with drawings and Examples, the utility model is described in further detail.

Fig. 1 is the circuit theory diagrams of the wireless energy transfer structure of a kind of four coil electromagnetism resonant modes of the utility model.

Embodiment

With reference to Fig. 1, a kind of wireless energy transfer structure of four coil electromagnetism resonant modes, comprise power supply resonant tank, launch resonant tank, receive resonant tank and loaded resonant tank, described power supply resonant tank is by power coil L1, internal resistance of source r, power supply V1, first resonant capacitance C1 and the first resistance R1 is followed in series to form, described transmitting resonant tank is by transmitting coil L2, second resonant capacitance C2 and the second resistance R2 is followed in series to form, described reception resonant tank is by receiving coil L3, 3rd resonant capacitance C3 and the 3rd resistance R3 is followed in series to form, described loaded resonant tank is by loading coil L4, 4th resonant capacitance C4, 4th resistance R4 and load RL is followed in series to form, described power coil L1 and transmitting coil L2 adopts the mode of Double-wire parallel wound to be coiled into a twin coil, and described transmitting coil L2 and receiving coil L3 is of coupled connections, and described receiving coil L3 and loading coil L4 is of coupled connections.

With reference to Fig. 1, be further used as preferred embodiment, the coiling of described receiving coil L3 is identical with arbitrary burst of coiling in twin coil, and described receiving coil L3 is independently positioned between described receiving coil L2 and loading coil L4.

With reference to Fig. 1, be further used as preferred embodiment, the coiling of described loading coil L4 is identical with arbitrary burst of coiling in twin coil, after described loading coil L4 is independently positioned over receiving coil L3.

Be further used as preferred embodiment, the distance d34 of described receiving coil L3 and loading coil L4 meets:

$d_{34}=\sqrt{{\left(\frac{{\mathrm{\μ}}_0\mathrm{\π}{N}^2{r}^4}{2k_{34}L}\right)}^{2/3}-r^2},$

Wherein, L is the inductance value of receiving coil and loading coil, and N is the number of turn of receiving coil and loading coil, and r is the coil radius of receiving coil and loading coil, μ ₀for air permeability, k34 is the Best Coupling coefficient of take-up circle and loading coil.

Below in conjunction with Figure of description and specific embodiment, the utility model is described in further detail.

Embodiment one

As shown in Figure 1, the first embodiment of the present utility model:

The wireless energy transfer structure of a kind of four coil electromagnetism resonant modes of the utility model, is made up of four resonant tanks: power supply resonant tank, transmitting resonant tank, reception resonant tank and loaded resonant tank.Power supply resonant tank comprises power supply V1, power coil L1, the first resonant capacitance C1 and the first resistance R1 that internal resistance is r, power supply V1, power coil L1, the first resonant capacitance C1 and the first resistance R1 connect successively, form a complete loop, i.e. power supply resonant tank.Launch resonant tank and comprise transmitting coil L2, the second resonant capacitance C2 and the second resistance R2, transmitting coil L2, the second resonant capacitance C2 and the second resistance R2 connect successively, form a complete loop, namely launch resonant tank.Receive resonant tank and comprise receiving coil L3, the 3rd resonant capacitance C3 and the 3rd resistance R3.Receiving coil L3, the 3rd resonant capacitance C3 and the 3rd resistance R3 connect successively, form a complete loop, namely receive resonant tank.Loaded resonant tank comprises loading coil L4, the 4th resonant capacitance C4, the 4th resistance R4, and load RL.Loading coil L4, the 4th resonant capacitance C4, the 4th resistance R4 and load RL connect successively, form a complete loop, i.e. loaded resonant tank.The input angle frequency of power supply is the operating angle frequency of system, and when operating angle frequency reaches the resonance angular frequency of four resonant tanks, four inductance coils electromagnetic resonance occur simultaneously, carry out Energy Transfer by strong magnetic-coupled mode.

Power coil L1 and transmitting coil L2 is merged into a twin coil in the mode of Double-wire parallel wound by the utility model, and material, the length of two bursts of coilings used are identical with winding method.Two bursts of coilings are separate, and wherein one coiling is connected in power supply resonant tank as power coil L1, and one coiling is connected to as transmitting coil L2 and launches in resonant tank in addition.The coiling of receiving coil L3 is identical with wherein one coiling of transmitting coil L2 with power coil L1, after being independently positioned over transmitting coil L2.The coiling of loading coil L4 is identical with wherein one coiling of transmitting coil L2 with power coil L1, after being independently positioned over receiving coil L3.

Embodiment two

The utility model is described designing power supply coil and transmitting coil, coupling coefficient between receiving coil and loading coil and distance correlation theory and process.

According to electromagnetic coupling theory, the scope of the coupling coefficient k between two identical inductance coils is: 0≤k≤1, and coupling coefficient k about the expression formula of distance d is:

$k=\frac{{\mathrm{\μ}}_0\mathrm{\π}{N}^2{r}^4}{2{(d^2+r^2)}^{3/2}L}$

Wherein, L is the inductance value of two inductance coils, and N is the number of turn of two inductance coils, and r is the coil radius of two inductance coils, μ ₀for air permeability, d is the distance between two coils.Distance d between two coils is larger, and coupling coefficient k is less.

Theoretical according to electromagnetic resonance Energy Transfer, when the parameter of four resonant tanks is identical, systematic energy is optimum.Therefore, the utility model makes the inductance value L1=L2=L3=L4=L of four coils, the capacitance C1=C2=C3=C4=C of four electric capacity, the resistance R1=R2=R3=R4=R of four resistance.Coupling coefficient between power coil L1 and transmitting coil L2 is k ₁₂, distance is d ₁₂.Coupling coefficient between transmitting coil L2 and receiving coil L3 is k ₂₃, distance is d ₂₃.Coupling coefficient between receiving coil L3 and loading coil L4 is k ₃₄, distance is d ₃₄.

If the operating angle frequency of power supply is ω, then the reactance of four resonant tanks is: X=ω L-1/ ω C.

Mutual inductance between four inductance coils is: M ₁₂=k ₁₂l, M ₂₃=k ₂₃l, M ₃₄=k ₃₄l.

The inductance L of power supply V1, operating frequency f, four resonant tanks, electric capacity C and resistance R are called the resonant parameter of system by the utility model, by the coupling coefficient k between adjacent two coils ₁₂, k ₂₃, k ₃₄, and load RL is called the running parameter of system.The relational expression of the efficiency eta of system and the resonant parameter of system and running parameter is as follows:

$\mathrm{\η}=\frac{P_{\mathrm{load}}}{P_{\mathrm{in}}}=\frac{{\left|{\mathrm{\ω}}^3{M}_{12}{M}_{23}{M}_{34}\right|}^2{R}_L}{\mathrm{Re}\left(I_{1N}\right)*\mathrm{Re}\left(I_{1D}\right)+\mathrm{Im}\left(I_{1N}\right)*\mathrm{Im}\left(I_{1D}\right)}$

Wherein,

$I_1=\frac{\mathrm{Re}\left(I_{1N}\right)+\mathrm{jIm}\left(I_{1N}\right)}{\mathrm{Re}\left(I_{1D}\right)+\mathrm{jIm}\left(I_{1D}\right)}$

$\begin{array}{c}\mathrm{Re}\left(I_{1D}\right)=(\mathrm{rR}+R^2-X^2)(R{R}_L+R^2-X^2)-(r+2R)(2R+R_L)X^2+(\mathrm{rR}+R^2-X^2){\mathrm{\ω}}^2{M}_{34}^2\\ +(\mathrm{rR}+R^2+R{R}_L+r{R}_L-X^2){\mathrm{\ω}}^2{M}_{23}^2+(R{R}_L+R^2-X^2){\mathrm{\ω}}^2{M}_{12}^2+{\mathrm{\ω}}^4{M}_{12}^2{M}_{34}^2\end{array}$

$\begin{array}{c}\mathrm{Im}\left(I_{1D}\right)=(\mathrm{rR}+R^2-X^2)(2R+R_L)X+(r+2R)(R{R}_L+R^2-X^2)X+(2R+r)X{\mathrm{\ω}}^2{M}_{34}^2\\ +(R_L+r+2R){\mathrm{X\ω}}^2{M}_{23}^2+(R_{L}X+2\mathrm{RX}){\mathrm{\ω}}^2{M}_{12}^2\end{array}$

$\begin{array}{c}\mathrm{Re}\left(I_{1N}\right)=R^2(R+R_L)-(3R+R_L)X^2+R{\mathrm{\ω}}^2{M}_{34}^2+(R+R_L){\mathrm{\ω}}^2{M}_{23}^2\end{array}$

$\begin{array}{c}\mathrm{Im}\left(I_{1N}\right)=(2\mathrm{XR}+R^2)(R+R_L){-X}^3+X{\mathrm{\ω}}^2{M}_{34}^2+X{\mathrm{\ω}}^2{M}_{23}^2\end{array}$

The present embodiment gets L=1mH, C=1uF, R=1 Ω, supply voltage V1=20V, and internal resistance of source r=50 Ω, load RL=50 Ω, emulates the efficiency eta of system, analyzes the adjacent coupling coefficient k between four inductance coils successively ₁₂, k ₂₃, k ₃₄on the impact of the efficiency eta of system, the conclusion drawn is as follows:

(a). as coupling coefficient k ₁₂time larger, the efficiency eta of system is larger.The i.e. distance d of power coil and transmitting coil ₁₂less, the efficiency eta of system is larger.Therefore, by power coil and transmitting coil Double-wire parallel wound, farthest reduce the distance of these two coils, thus make the most effective of system.

(b). at k ₂₃in the scope of <0.72, the efficiency eta of system is with k ₂₃increase and increase; At k ₂₃in the scope of >0.72, the efficiency eta of system is with k ₂₃increase almost constant.According to the relational expression between coupling coefficient and distance, the optimum distance d that transmitting coil is corresponding with receiving coil can be drawn ₂₃.But, the distance d between transmitting coil L2 and receiving coil L3 ₂₃be the effective propagation path of system, d ₂₃design also to determine according to the embody rule occasion of system: if require in practical application that transmission range is larger, namely coupling coefficient is k ₂₃less, so will the efficiency of sacrificial system; If higher to the efficiency requirements of system in practical application, so transmission range is just limited.

(c). at k ₃₄in the scope of <0.34, the efficiency eta of system is with k ₃₄increase and increase; At k ₃₄in the scope of >0.34, the efficiency eta of system is with k ₃₄increase and reduce, so for this system, k ₃₄=0.34 is best coupling coefficient k ₃₄.According to the relational expression between coupling coefficient and distance, k can be obtained ₃₄the distance d of=0.34 correspondence ₃₄, this is the receiving coil optimum distance corresponding with loading coil.

Compared with prior art, the utility model has the following advantages:

1, by power coil and transmitting coil Double-wire parallel wound, the coupling coefficient k of power coil and transmitting coil is farthest increased ₁₂; Also according to the Best Coupling coefficient of transmitting coil and loading coil, devise the optimum distance of transmitting coil and loading coil, effectively can improve the efficiency of system, increase the wireless transmission distance of energy.

2, by power coil and transmitting coil Double-wire parallel wound, synthesize a two coil configuration, substantially reduce the size of system, make system configuration compacter, overcome because system takes up room too large and cause the defect that it cannot use in some occasions, effectively expanding systematic difference occasion.

3, appropriate design power coil and transmitting coil, coupling coefficient between receiving coil and loading coil and distance, effectively relax the contradictory relation between the transmission range of system and efficiency, make system work process in when requiring transmission range larger, its efficiency can not obviously reduce, and can run with ensureing system high efficiency all the time.

More than that better enforcement of the present utility model is illustrated, but the utility model is created and is not limited to described embodiment, those of ordinary skill in the art also can make all equivalent variations or replacement under the prerequisite without prejudice to the utility model spirit, and these equivalent distortion or replacement are all included in the application's claim limited range.

Claims (4)

1. the wireless energy transfer structure of a coil electromagnetism resonant mode, it is characterized in that: comprise power supply resonant tank, launch resonant tank, receive resonant tank and loaded resonant tank, described power supply resonant tank is by power coil (L1), the internal resistance of source (r), power supply (V1), first resonant capacitance (C1) and the first resistance (R1) are followed in series to form, described transmitting resonant tank is by transmitting coil (L2), second resonant capacitance (C2) and the second resistance (R2) are followed in series to form, described reception resonant tank is by receiving coil (L3), 3rd resonant capacitance (C3) and the 3rd resistance (R3) are followed in series to form, described loaded resonant tank is by loading coil (L4), 4th resonant capacitance (C4), 4th resistance (R4) and load (RL) are followed in series to form, described power coil (L1) and transmitting coil (L2) adopt the mode of Double-wire parallel wound to be coiled into a twin coil, and described transmitting coil (L2) and receiving coil (L3) are of coupled connections, and described receiving coil (L3) and loading coil (L4) are of coupled connections.

2. the wireless energy transfer structure of a kind of four coil electromagnetism resonant modes according to claim 1, it is characterized in that: the coiling of described receiving coil (L3) is identical with arbitrary burst of coiling in twin coil, described receiving coil (L3) is independently positioned between transmitting coil (L2) and loading coil (L4).

3. the wireless energy transfer structure of a kind of four coil electromagnetism resonant modes according to claim 1, it is characterized in that: the coiling of described loading coil (L4) is identical with arbitrary burst of coiling in twin coil, after described loading coil (L4) is independently positioned over receiving coil (L3).

4. the wireless energy transfer structure of a kind of four coil electromagnetism resonant modes according to claim 1, is characterized in that: the distance d of described receiving coil (L3) and loading coil (L4) ₃₄meet:

，

Wherein, lfor the inductance value of receiving coil and loading coil, nfor the number of turn of receiving coil and loading coil, rfor the coil radius of receiving coil and loading coil, for air permeability, k ₃₄ for the Best Coupling coefficient of take-up circle and loading coil.