CN202918068U - Energy coupling verification system based on coupled mode theory - Google Patents

Abstract

The utility model is an energy coupling verification system based on the coupling mode theory, which belongs to the category of wireless energy transmission and conversion. When the electromagnetic coupling resonance technology is used to realize the efficient transmission and conversion of energy within a range of several meters, the power transmission can be carried out through this system. Process analysis and evaluation. The device adopts the coupling mode theory as the basis, and obtains the oscillator time domain solution of the wireless power transmission process according to the set initial oscillation condition, so as to carry out qualitative analysis on the transmission process. Mainly include: source coil S, resonant coil A1, resonant coil A2, load coil D, oscilloscope. The utility model can accurately analyze and evaluate the high-efficiency wireless energy transmission process of the load within the range of several meters, and has the advantages of simple and convenient operation, high efficiency and accuracy.

Description

Energy Coupling verification system based on coupled mode theory

Technical field

The wireless power transmission technology is one of most active hot research direction in present electrical engineering field, it is the advanced subject that integrates basic research and application study, be the new research field of a multidisciplinary strong intersection of the outer academia of Present Domestic and industrial quarters exploration, contain many technical fields such as electromagnetic field, electric power system, power electronic technology, control technology, materialogy, physics, information technology.Adopt the wireless power mode can effectively overcome all kinds of defectives that the electric wire connected mode exists, realize freely powering of electronic apparatus, have important application expection and vast potential for future development.

The utility model---based on the Energy Coupling verification system of coupled mode theory, according to the wireless power transmission know-why, according to the coupled mode theory in the oscillatory system, can solve the Energy coupling function under the different coupling conditions, and compare with actual coupling situation, the Energy Coupling characteristic of electromagnetic coupled resonator system can be analyzed accurately and estimate, the qualitative analysis of electromagnetic coupled resonator system and the occasion of actual design can be widely used in.

Background technology

The wireless power transmission technology is broadly divided into three kinds: the first is the inductive coupling type electric energy transmission, and it utilizes the loosely coupled transformer principle to pass energy, and generally there are the core device that reduces the loop magnetic resistance in transmitting terminal and receiving terminal.The second is electromagnetic coupled resonant mode delivery of electrical energy, by inductance on the resonator of high quality factor and distributed capacitor generation resonance transmitting energy.The third is electromagnetic radiation formula delivery of electrical energy, and electric energy is converted into microwave form in this technology, and transmission range exceedance km can be realized the teletransmission of electric energy.Wherein the electromagnetic coupled harmonic technology utilizes non-radiative electromagnetic field near-field region to finish delivery of electrical energy, than induction biography energy, in transmission range very large expansion has been arranged on the one hand; Compare on the other hand the electromagnetic radiation formula and pass energy, the near-field region energy has radiationless characteristics, and this technology has preferably fail safe, therefore obtains at present very large concern and research.

Summary of the invention

Technical problem to be solved in the utility model is, by wireless power transmission and coupled mode theory, electromagnetic coupled resonance type wireless electric energy transmission system is found the solution and experimental verification, accurate analysis with estimate different coupling conditions under the delivery of electrical energy situation.

The technical scheme that the utility model adopts is: based on the Energy Coupling verification system of coupled mode theory, include source coil S electric energy is loaded into resonance coil A1 by the mode of responding to, resonance coil A1 is by electromagnetic coupled harmonic technology and resonance coil A2 positive energy exchange, then resonance coil A2 sends energy to loading coil D in the mode of induction again, oscilloscope is responsible for the waveform on monitor source coil S and the loading coil D, solves the time solution in the different coupling situations and compares with the oscilloscope result according to coupled mode theory.

Described source coil S shows through realizing after the silver-plated antirust processing by having certain thickness individual pen low-loss copper tube, and place with loading coil D symmetric coaxial, the electromagnetic power frequency that is loaded on the source coil S can be adjusted according to actual conditions, goes out coil energy thereby its first line of a couplet is connected to oscilloscope with Real-Time Monitoring voltage waveform indirect calculation.

Described resonance coil A1 by copper conductor turn to helical structure and with the coaxial placement of source coil S, the number of turn of helical structure, radius and turn-to-turn are apart from determining according to concrete operating frequency, responsible induction is positioned at the high-frequency energy on the source coil S and sets up idle near field.The quality factor of resonance coil A1 can be adjusted as requested.

Described resonance coil A2 turns to helical structure by copper conductor and places with the coaxial symmetry of resonance coil A1, the number of turn of helical structure, radius and turn-to-turn are responsible for absorbing energy from the idle near field that resonance coil A1 sets up and passing to loading coil D apart from determining according to concrete operating frequency.The quality factor of resonance coil A2 can be adjusted as requested.

Energy Coupling verification system based on coupled mode theory of the present utility model, load High frequency electromagnetic power and send resonance coil A1 in the mode of responding to by source coil S, energy sends resonance coil A2 in the mode of electromagnetic coupled resonance, and then by the induction mode send loading coil D to, thereby make loading coil D obtain wirelessly electric energy, realize the stable supply of electric power of high efficient and reliable in the several meters scopes, the design parameter substitution coupling mode equations group of coil can be obtained concrete time solution, thereby can compare analysis with real system.

Description of drawings

Fig. 1 is the overall structure figure of electromagnetic coupled resonator system;

Fig. 2 is the structure chart of coaxial placement coupling coil;

Fig. 3 is the Energy coupling function figure when not satisfying the resonance frequency uniform condition;

Fig. 4 is the Energy coupling function figure when not satisfying coupling speed greater than the loss rate conditions;

Fig. 5 is the Energy coupling function figure when satisfying simultaneously two give-and-take conditions.

Wherein:

1: source coil S; 2: resonance coil A1; 3: resonance coil A2; 4: loading coil D; 5: oscilloscope; M _S1: feedback capacity; M ₁₂: alternating current bypass electric capacity; M _2D: feedback capacity; | a ₁| ²: the energy of resonance coil A1; | a ₂| ²: the energy of resonance coil A2; | a ₁| ²+ | a ₂| ²: the gross energy that contains on the resonance coil; P: energy function; T (ms): the function of time.

Embodiment

Below in conjunction with example and accompanying drawing the Energy Coupling verification system based on coupled mode theory of the present utility model is made a detailed description.

As shown in Figure 1, Energy Coupling verification system based on coupled mode theory of the present utility model, include: include source coil S, resonance coil A1, resonance coil A2, loading coil D and oscilloscope solve the time solution in the different coupling situations and compare with the oscilloscope result according to coupled mode theory.

As shown in Figure 2, described resonance coil A1 mode with electromagnetic induction after source coil S obtains High frequency electromagnetic power is loaded into energy on the coil, and then forms idle near field on every side.Resonance coil A2 and the consistent and coaxial placement of resonance coil A1 structure, the two has certain quality factor.Therefore theoretical according to electromagnetic coupled description wireless power transmission, energy exchange will occur when a determining deviation, make simultaneously loading coil D obtain energy.The distance of Energy Transfer can quantitatively be calculated by coupled mode theory with size, and adopts oscilloscope to cooperate current probe to carry out actual measurement.

As shown in Figure 3, during described resonance coil A2 normal operation, according to coupled mode theory, the Oscillations of oscillator satisfies following equation:

$\left\{\begin{array}{c}\frac{{\mathrm{da}}_1}{\mathrm{dt}}=j{\mathrm{\&omega;}}_1{\mathrm{<figure-callout\; id="1"\; label="a"\; filenames="HSA00000795282200012.png"\; state="\{\{state\}\}">a</figure-callout>}}_1+{\mathrm{\&kappa;}}_{12}{\mathrm{<figure-callout\; id="2"\; label="a"\; filenames="HSA00000795282200012.png,HSA00000795282200021.png"\; state="\{\{state\}\}">a</figure-callout>}}_2\\ \frac{{\mathrm{da}}_2}{\mathrm{dt}}={\mathrm{\&kappa;}}_{21}{\mathrm{<figure-callout\; id="1"\; label="a"\; filenames="HSA00000795282200012.png"\; state="\{\{state\}\}">a</figure-callout>}}_1+{\mathrm{j\&omega;}}_2{a}_2\end{array}\right.---\left(1\right)$

A in the formula ₁, a ₂, ω ₁, ω ₂, κ ₁₂With κ ₂₁Oscillation mode, angular frequency and the Mode Coupling factor of expression resonance coil A1 and A2.Given initial oscillating condition:

Γ：t＝0，a ₁(t)＝A ₁(0)；a ₂(t)＝0 (2)

Calculate as can be known by integration theorem:

$\left\{\begin{array}{c}{a}_1\left(t\right)=A_1\left(0\right)[\cos \left(\mathrm{\&Omega;t}\right)+j\frac{{\mathrm{\&omega;}}_1-{\mathrm{\&omega;}}_2}{2\mathrm{\&Omega;}}\sin \left(\mathrm{\&Omega;t}\right)]\&CenterDot;e^{j\frac{{\mathrm{\&omega;}}_1+{\mathrm{\&omega;}}_2}{2}t}\\ a_2\left(t\right)=A_1\left(0\right){\mathrm{\&kappa;}}_{21}\sin \left(\mathrm{\&Omega;t}\right)/\mathrm{\&Omega;}\&CenterDot;e^{j\frac{{\mathrm{\&omega;}}_1+{\mathrm{\&omega;}}_2}{2}t}\end{array}---\left(3\right)\right.$

In the formula:

$\mathrm{\&Omega;}=\sqrt{{({\mathrm{\&omega;}}_1-{\mathrm{\&omega;}}_2)}^2/4-{\mathrm{\&kappa;}}_{12}{\mathrm{\&kappa;}}_{21}}---\left(4\right)$

Work as ω ₁≠ ω ₂The time, | a ₁| ², | a ₂| ²With | a ₁| ²+ | a ₂| ²All according to the index law decay, still | a ₁| ²With | a ₂| ²The two amplitude differs greatly, and shows that energy only has sub-fraction that exchange has occured, the inconsistent situation of the operating frequency of corresponding resonance coil.

As shown in Figure 4, described resonance coil A2 satisfies:

|κ ₁₂κ ₂₁|＞(ω ₁ω ₂)/(4Q ₁Q ₂) (5)

Q in the formula ₁With Q ₂The quality factor of expression resonance coil.At this moment, | a ₁| ²With | a ₂| ²The decay amplitude is identical, still | and a ₁| ², | a ₂| ²With | a ₁| ²+ | a ₂| ²All decay rapidly according to index law, show completely exchange can occur on the energy theory, but the resonator system loss is serious, the situation that the quality factor of corresponding resonance coil are excessively low.

As shown in Figure 5, described Energy Coupling verification system based on coupled mode theory is worked as satisfied:

$\left\{\begin{array}{c}{\mathrm{\&omega;}}_1={\mathrm{\&omega;}}_2\\ \left|{\mathrm{\&kappa;}}_{12}{\mathrm{\&kappa;}}_{21}\right|>\left({\mathrm{\&omega;}}_1{\mathrm{\&omega;}}_2\right)/\left(4Q_1{Q}_2\right)\end{array}\right.---\left(6\right)$

This formula represents, resonance coil A1 equates with the angular frequency of A2, and Energy Coupling speed is much larger than energy loss speed.At this moment, | a ₁| ², | a ₂| ²With | a ₁| ²+ | a ₂| ²All according to the index law slow-decay, | a ₁| ²With | a ₂| ²The decay amplitude is identical, shows that the process that completely exchange and exchange can occur on the energy theory can continue to carry out.

Energy Coupling verification system based on coupled mode theory of the present utility model, according to the wireless power transmission know-why, can solve the Energy coupling function under the different coupling conditions, and compare with actual coupling situation, can analyze accurately and estimate the Energy Coupling characteristic of electromagnetic coupled resonator system, and can carry out theory analysis and experimental verification to the impact of frequency and quality factor, can be widely used in the qualitative analysis of electromagnetic coupled resonator system and the occasion of actual design.

Claims (3)

1. The energy coupling verification system based on coupled mode theory is characterized in that it includes a new electromagnetic coupling resonant wireless power transmission system, including an active coil S that loads electric energy to the resonant coil A1 through induction, and the resonant coil A1 is electromagnetically coupled. Resonant technology exchanges energy with the resonant coil A2, and then the resonant coil A2 transmits the energy to the load coil D in an inductive manner. The oscilloscope is responsible for monitoring the waveforms on the source coil S and the load coil D, and solves the different coupling conditions according to the coupling mode theory. time-domain solution and compare with the oscilloscope results. 2. The energy coupling verification system based on coupled mode theory according to claim 1, further characterized in that, said source coil S passes through a single-turn low-loss copper tube with a certain thickness to indicate that after silver-plated anti-rust treatment Realized, and placed symmetrically and coaxially with the load coil D, the electromagnetic power frequency loaded on the source coil S can be adjusted according to the actual situation, and an oscilloscope is connected to it to monitor the voltage waveform in real time to indirectly calculate the coil energy. 3. The energy coupling verification system based on coupled mode theory according to claim 1, further characterized in that, the resonant coil A1 is wound by a copper conductor into a helical structure and placed coaxially with the source coil S.

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