CN106208416A - Electromagnetism chain type radio energy transmission system - Google Patents

Abstract

The invention provides a kind of electromagnetism chain type radio energy transmission system, including simple resonant tank, loaded resonant tank and be arranged on the relaying resonant tank between described simple resonant tank and described loaded resonant tank, described simple resonant tank includes excitation power supply and the simple resonant element connected with this excitation power supply, described relaying resonant tank includes that n 2 relays resonant element, n is the integer more than 2, described loaded resonant tank includes equivalent load and the secondary level resonant element with this equivalence load in series, resonance coil in each resonant element is distribution planar spiral winding at grade.This electromagnetism chain type radio energy transmission system utilizes the chain type characteristic of electromagnetic field that energy is implemented recursion, can greatly expand the wireless transmission distance of electric energy, ensure that electric energy obtains high efficiency transmission under the conditions of longer-distance, it is adaptable to if Aeronautics and Astronautics, seabed etc. are to passing energy distance and the application of efficiency requirements harshness.

Description

Electromagnetism chain type radio energy transmission system

Technical field

The present invention relates to wireless power transmission technical field, be specifically related to a kind of electromagnetism chain type radio energy transmission system.

Background technology

Wireless power transmission (Wireless Power Transmission, WPT) is also known as wireless power transmission, noncontact Electric energy transmits, and is to convert electrical energy into the relaying energy of other forms (such as electromagnetism field energy, laser, microwave and machine by emitter Tool ripple etc.), after sky transmits a segment distance, by receptor, relaying energy is being converted to electric energy, it is achieved wireless power transmission.

Traditional wireless power transmission generally uses two technology: (1) electromagnetic induction principle.Two coils are positioned over In adjacent locations, when electric current moves at a coil midstream, produced magnetic flux becomes medium, causes in another coil also Produce electromotive force.(2) electromagnetic wave energy can be sent by antenna and record principle, and radio principle is essentially identical.These are two years old Being limited in that of item technology: higher energy transmission efficiency cannot be obtained in larger distance.

Summary of the invention

The application is by providing a kind of electromagnetism chain type radio energy transmission system, to solve cannot ensure in prior art electricity The technical problem of the transmission of greater efficiency can be obtained under the conditions of longer-distance.

For solving above-mentioned technical problem, the application is achieved by the following technical solutions:

A kind of electromagnetism chain type radio energy transmission system, including simple resonant tank, loaded resonant tank and be arranged on Relaying resonant tank between described simple resonant tank and described loaded resonant tank, described simple resonant tank includes excitation Power supply and the simple resonant element connected with this excitation power supply, described relaying resonant tank includes n-2 relaying resonant element, n For the integer more than 2, described loaded resonant tank includes equivalent load and the secondary level resonant element with this equivalence load in series, respectively Resonance coil in resonant element is distribution planar spiral winding at grade.

Excitation power supply is set to the sinusoidal voltage source that angular frequency is ω, and chooses resonant capacitance and make all resonant tanks Resonant frequency is equal with the angular frequency of excitation power supply.

Further, the electric energy efficiency of transmission of n dimension electromagnetism chain type radio energy transmission system is:

${\mathrm{\η}}_n=\frac{R}{\underset{l=1}{\overset{n-1}{\Σ}}\frac{R_l}{\underset{s=l}{\overset{n-1}{\mathrm{\Π}}}{k}_{s(s+1)}^2}+R_n+R}$

In formula, R is equivalent load, R_nFor the internal resistance of loaded resonant tank, R_lIt is the internal resistance of l resonance coil, 1≤l≤ N-1, k_s(s+1)For positive impedance gain, l≤s≤n-1.From above formula, the internal resistance R of resonance coil_lThe least, or impedance increasing K is the biggest for benefit, and the electric energy efficiency of transmission of system is the highest；As k ＞ 1, magnetic linkage formula radio energy transmission system utilizes electromagnetic linkage handle Current amplifier, otherwise, electromagnetic linkage reduces electric current.

Further, the electric energy transmission range of n dimension electromagnetism chain type radio energy transmission system is:

$D=\[\left({r_1}_1\right)+{\mathrm{dt}}_1{N}_1\]+2\underset{m=2}{\overset{n-1}{\Σ}}\[\left({r_1}_m\right)+{\mathrm{dt}}_m{N}_m\]+\[\left({r_1}_n\right)+{\mathrm{dt}}_n{N}_n\]$

In formula,ⁱr_mFor the radius that the i-th circle coil of m-th coil is corresponding, 2≤m≤n-1, N_mCoil for m-th coil The number of turn, dt_mFor m-th coil turn-to-turn away from.

Compared with prior art, the technical scheme that the application provides, the technique effect or the advantage that have be: this electromagnetism chain type Radio energy transmission system utilizes the chain type characteristic of electromagnetic field that energy is implemented recursion, it is possible to greatly expand the wireless biography of electric energy Defeated distance, it is ensured that electric energy obtains high efficiency transmission under the conditions of longer-distance, it is adaptable to as Aeronautics and Astronautics, seabed etc. are right Passing can distance and the application of efficiency requirements harshness.

Accompanying drawing explanation

Fig. 1 is the system structure schematic diagram of the present invention；

Fig. 2 is the circuit system structure chart of the present invention；

Fig. 3 is the planar spiral winding schematic diagram of the present invention；

Fig. 4 is the single turn position view of any two adjacent windings of the present invention；

Fig. 5 is the coil distribution schematic diagram of the present invention；

Fig. 6 is the affecting laws figure of number of coils (electric energy transmission range) and electric energy efficiency of transmission；

Fig. 7 is the load affecting laws figure to electric energy efficiency of transmission.

Detailed description of the invention

The invention provides a kind of electromagnetism chain type radio energy transmission system, to solve prior art cannot ensure electric energy The technical problem of the transmission of greater efficiency is obtained under the conditions of longer-distance.

In order to be better understood from technique scheme, below in conjunction with Figure of description and specific embodiment, right Technique scheme is described in detail.

Embodiment

A kind of electromagnetism chain type radio energy transmission system, as it is shown in figure 1, include simple resonant tank, loaded resonant tank And it being arranged on the relaying resonant tank between described simple resonant tank and described loaded resonant tank, described simple resonance returns Road includes excitation power supply and the simple resonant element connected with this excitation power supply, and described relaying resonant tank includes n-2 relaying Resonant element, n is the integer more than 2, and described loaded resonant tank includes equivalent load and the secondary level with this equivalence load in series Resonant element, the resonance coil in each resonant element is distribution planar spiral winding at grade.

Fig. 2 show the circuit structure model of electromagnetism chain type radio energy transmission system, L_i、C_i、R_iAnd I_i(i=1, 2 ..., n) it is respectively the coil inductance of each resonant tank, tuning capacity, internal resistance and electric current, in figure, the direction of arrow is that electric current is square To, R is equivalent load, M_ij(i, j=1,2 ..., n, i ≠ j) it is the mutual inductance between different resonant tank coil,Input for system Voltage.

Excitation power supply is set to the sinusoidal voltage source that angular frequency is ω, and chooses resonant capacitance and make all resonant tanks Resonant frequency is equal with the angular frequency of excitation power supply, theoretical according to Mutual Inductance Coupling, can set up matrix equation:

According to formula (1), if the mutual inductance ignored in system between non-adjacent coil, and make:

${\mathrm{\ωM}}_{l(l+1)}=k_{l(l+1)}\[R_{l+1}+\underset{m=l+1}{\overset{n-1}{\Σ}}\left(\underset{s=m}{\overset{n-1}{\mathrm{\Π}}}{k^2}_{(n-s+l)(n-s+l+1)}{R}_{n-m+l+1}\right)+\underset{s=l+1}{\overset{n-1}{\mathrm{\Π}}}{k^2}_{(n-s+l)(n-s+l+1)}R\]---\left(2\right)$

In formula (2), k is positive impedance gain, and l is the positive integer less than n, and operatorWithAt p Set up during ＞ q.Then, in system, the electric current of each resonant tank meets:

$\left\{\begin{array}{c}{\stackrel{\&CenterDot;}{I}}_1=\frac{\stackrel{\&CenterDot;}{U}}{R_1+\underset{m=l+1}{\overset{n}{\&Sigma;}}\left(\underset{s=m}{\overset{n}{\mathrm{\&Pi;}}}{k^2}_{(n-s+l)(n-s+l+1)}{R}_{n-m+l+1}\right)+\underset{s=l+1}{\overset{n}{\mathrm{\&Pi;}}}{k^2}_{(n-s+l)(n-s+l+1)}R}\\ {\stackrel{\&CenterDot;}{I}}_{m+1}=-{\mathrm{jk}}_{m(m+1)}{\stackrel{\&CenterDot;}{I}}_m,1<m<n\end{array}\right.---\left(3\right)$

The electric energy efficiency of transmission of n dimension electromagnetism chain type radio energy transmission system is:

${\mathrm{\&eta;}}_n=\frac{R}{\underset{l=1}{\overset{n-1}{\&Sigma;}}\frac{R_l}{\underset{s=l}{\overset{n-1}{\mathrm{\&Pi;}}}{k}_{s(s+1)}^2}+R_n+R}$

In formula, R is equivalent load, R_nFor the internal resistance of loaded resonant tank, R_lIt is the internal resistance of l resonance coil, 1≤l≤ N-1, k_s(s+1)For positive impedance gain, l≤s≤n-1.From above formula, the internal resistance R of resonance coil_lThe least, or impedance increasing K is the biggest for benefit, and the electric energy efficiency of transmission of system is the highest；As k ＞ 1, magnetic linkage formula radio energy transmission system utilizes electromagnetic linkage handle Current amplifier, otherwise, electromagnetic linkage reduces electric current.

For simplifying the analysis, it is assumed that the coil of electromagnetism chain type radio energy transmission system is planar spiral winding, such as Fig. 3 Shown in, wherein, O_m、dt_m、ⁱr_mIt is respectively the center of circle of m-th coil, turn-to-turn away from, radius that the i-th circle coil is corresponding, and i is by introversion Outer number consecutively.

In electromagnetism chain type radio energy transmission system, single turn position view such as Fig. 4 institute of any two adjacent windings Showing, its mutual inductance is:

Corresponding coil mutual inductance is:

$M_{m(m+1)}=\underset{i=1}{\overset{N_m}{\&Sigma;}}\underset{j=1}{\overset{N_{m+1}}{\&Sigma;}}\&lsqb;{M_{ij}}_{m(m+1)}\&rsqb;---\left(6\right)$

It addition, system is when low-frequency range (DC～100kHz) works, Kelvin effect and the kindred effect impact on litz wire Less, negligible, then the internal resistance of coil m is:

R_m=k_fR_DCl_m (7)

In formula (7), k_fFor the low frequency coefficient (by measuring) of resistance, R_DCFor the direct current that the litz wire of unit length is corresponding Resistance, l_mWinding length for coil.

According to formula (6), (7), adjacent windings spacing d_m(m+1)The least, mutual inductance is the biggest；Turn number N_mOr N_m+1The biggest, mutual inductance The biggest, but Coil resistance is the biggest.Convolution (2) and (4), in order to increase the electric energy efficiency of transmission of system, need to increase impedance and increase Benefit k (i.e. the mutual inductance of adjacent windings) or reduction Coil resistance.It addition, adjacent windings spacing d_m(m+1)The electric energy transmission of the biggest system Distance is the biggest, and the mutual inductance between non-adjacent coil is the least, the most more can be left in the basket.Therefore, take into account electric energy efficiency of transmission and Distance, the coil distribution schematic diagram of electromagnetism chain type radio energy transmission system is as it is shown in figure 5, the n dimension electromagnetism chain type of correspondence is wireless The electric energy transmission range of electric energy transmission system is:

In formula (8),ⁱr_mFor the radius that the i-th circle coil of m-th coil is corresponding, 2≤m≤n-1, N_mFor m-th coil Coil turn, dt_mFor m-th coil turn-to-turn away from.

In order to verify above-mentioned theory analysis result, simultaneously in order to preferably analyze the systematic parameter impact rule on energy transfer efficiency Rule, the present embodiment utilizes Matlab software to carry out assistant analysis.During whole analysis, the litz wire line rule that system uses are NO.38AWG, corresponding k_f=1.7, R_DC=7.6m Ω/m, system resonance frequencies is set to 85kHz, and load resistance is set to 10 Ω, all coils structure arranges identical, and coil parameter is as shown in table 1.

Table 1 coil parameter table

The simulation result of number of coils n (electric energy transmission range D) and electric energy efficiency of transmission η as shown in Figure 6, wherein, works as line When circle number increases, the impact of system power efficiency of transmission is gradually increased by the mutual inductance between non-adjacent coil, but it is relative Influence value is less, negligible, demonstrates the effectiveness of theoretical analysis result；Meanwhile, electric energy efficiency of transmission is with coil number Increase and be gradually reduced；Being similar to two coil systems, the electric energy efficiency of transmission of system is inversely proportional to transmission range, but the latter Biography energy distance be far longer than the former, ensure that in theory and under the conditions of 85kHz resonant frequency, realize 10m and efficiency is higher than The electric energy transmission of 40%.

In order to analyze the load impact on electric energy efficiency of transmission, next to the resonance coil by 14 same sizes The electromagnetism chain type radio energy transmission system (electric energy transmission range is 10.4m) constituted is studied, and coil parameter is with table 1, imitative True result is as shown in Figure 7.

In the figure 7, when load resistance is 30 Ω, system obtains maximum electric energy efficiency of transmission, and efficiency value is 49.33%； When load resistance is less than 30 Ω, along with the increase of resistance value, the electric energy efficiency of transmission of system is gradually increased, but the change of efficiency Rate is gradually reduced；When load resistance is more than 30 Ω, along with the increase of resistance value, the electric energy efficiency of transmission of system gradually increases little, And the rate of change of efficiency is basically unchanged.

Optimal value is there is in the electric energy efficiency of transmission of electromagnetism chain type radio energy transmission system under different loading conditions, and Under heavy load condition very sensitive to the situation of change of load.Therefore, in order to ensure that system obtains under heavy load condition Electric energy efficiency of transmission that must be stable, need to carry out accuracy controlling to load.

In above-described embodiment of the application, by providing a kind of electromagnetism chain type radio energy transmission system, including simple humorous Shake loop, loaded resonant tank and be arranged on the relaying resonance between described simple resonant tank and described loaded resonant tank Loop, described simple resonant tank includes excitation power supply and the simple resonant element connected with this excitation power supply, and described relaying is humorous Shake loop include n-2 relaying resonant element, n is the integer more than 2, described loaded resonant tank include equivalent load and with this The secondary level resonant element of equivalent load series connection, the resonance coil in each resonant element is distribution plane spiral shell at grade Spin line circle.This electromagnetism chain type radio energy transmission system utilizes the chain type characteristic of electromagnetic field that energy is implemented recursion, it is possible to greatly The wireless transmission distance of electric energy is expanded on ground, it is ensured that electric energy obtains high efficiency transmission under the conditions of longer-distance, it is adaptable to as Aeronautics and Astronautics, seabed etc. are to passing energy distance and the application of efficiency requirements harshness.

It should be pointed out that, described above is not limitation of the present invention, the present invention is also not limited to the example above, Change, modification that those skilled in the art are made in the essential scope of the present invention, add or replace, also should Belong to protection scope of the present invention.

Claims (4)

1. an electromagnetism chain type radio energy transmission system, it is characterised in that include simple resonant tank, loaded resonant tank with And it is arranged on the relaying resonant tank between described simple resonant tank and described loaded resonant tank, described simple resonant tank Including excitation power supply and the simple resonant element connected with this excitation power supply, described relaying resonant tank includes that n-2 relaying is humorous Shake unit, and n is the integer more than 2, and described loaded resonant tank includes equivalent load and humorous with the secondary level of this equivalence load in series Shake unit, and the resonance coil in each resonant element is distribution planar spiral winding at grade.

Electromagnetism chain type radio energy transmission system the most according to claim 1, it is characterised in that choose resonant capacitance and make The resonant frequency of all resonant tanks is equal with the angular frequency of excitation power supply.

Electromagnetism chain type radio energy transmission system the most according to claim 2, it is characterised in that n dimension electromagnetism chain type is wireless The electric energy efficiency of transmission of electric energy transmission system is:

${\mathrm{\&eta;}}_n=\frac{R}{\underset{l=1}{\overset{n-1}{\&Sigma;}}\frac{R_l}{\underset{s=l}{\overset{n-1}{\&Pi;}}{k}_{s(s+1)}^2}+R_n+R}$

In formula, R is equivalent load, R_nFor the internal resistance of loaded resonant tank, R_lIt is the internal resistance of l resonance coil, 1≤l≤n-1, k_s(s+1)For positive impedance gain, l≤s≤n-1.

Electromagnetism chain type radio energy transmission system the most according to claim 2, it is characterised in that n dimension electromagnetism chain type is wireless The electric energy transmission range of electric energy transmission system is:

$D=\&lsqb;\left({r_1}_1\right)+{\mathrm{dt}}_1{N}_1\&rsqb;+2\underset{m=2}{\overset{n-1}{\&Sigma;}}\&lsqb;\left({r_1}_m\right)+{\mathrm{dt}}_m{N}_m\&rsqb;+\&lsqb;\left({r_1}_n\right)+{\mathrm{dt}}_n{N}_n\&rsqb;$

In formula,ⁱr_mFor the radius that the i-th circle coil of m-th coil is corresponding, 2≤m≤n-1, N_mCoil turn for m-th coil Number, dt_mFor m-th coil turn-to-turn away from.