CN102611209A - Magnetic coupling resonance type wireless energy transmission device based on panel magnetic core - Google Patents

Abstract

A magnetic coupling resonance type wireless energy transmission device based on a panel magnetic core belongs to the technical field of magnetic coupling resonance type wireless energy transmission and solves the problem that existing magnetic coupling resonance type wireless energy transmission devices can be only used for low-power energy transmission. The output direct voltage of an energy supply circuit of the device is used as the direct-current busbar voltage Vdc for a coil drive circuit, the coil drive circuit outputs alternating-current square signals and applying the same to a resonance circuit to enable a transmitting coil to generate magnetic field energy, and the resonance circuit consists of an energy transmitting side capacitor bank and the transmitting coil of an energy transmitting subsystem. A magnetic field of the energy transmitting subsystem and a resonance circuit consisting of an energy receiving side capacitor bank and a receiving coil of an energy receiving subsystem are used for magnetic coupling resonance to generate electric energy on the receiving coil of the energy receiving subsystem, and the electric energy is transmitted to an energy conversion circuit which converts input signals of the electric energy into direct-current power voltage signals required by a load. The magnetic coupling resonance type wireless energy transmission device is used for wireless energy transmission.

Description

Magnetic coupling resonant wireless energy transmission device based on flat magnetic core

technical field

The invention relates to a magnetic coupling resonance wireless energy transmission device based on a flat magnetic core, and belongs to the technical field of magnetic coupling resonance wireless energy transmission.

Background technique

Due to its safety, convenience and broad application prospects, wireless energy transmission technology has attracted much attention, and it has gradually replaced the traditional wire energy transmission method.

The wireless energy transmission using electromagnetic field can be mainly divided into electromagnetic induction type and magnetic coupling resonance type. Electromagnetic induction wireless energy transmission generally uses traditional E-type or pot-type magnetic cores, which are often relatively large in size and weight, and the transmission distance is relatively short, which greatly limits its application. The magnetic coupling resonant wireless energy transmission device without magnetic core structure, for example, the Chinese patent "Magnetic coupling resonant wireless energy transmission device" with the publication number of CN101316053 and the publication date on December 3, 2008, cannot meet the needs of users. Defects in the high power requirements of electrical equipment.

Contents of the invention

The present invention aims to solve the problem that the existing magnetic coupling resonant wireless energy transmission device can only transmit low-power energy, and provides a magnetic coupling resonant wireless energy transmission device based on a flat magnetic core.

The magnetically coupled resonant wireless energy transmission device based on the planar magnetic core of the present invention includes an energy supply circuit, and it also includes a resonance control circuit, a coil drive circuit, an energy transmitting side capacitor bank, an energy transmitting subsystem, and an energy receiving subsystem , energy receiving side capacitor bank, receiving energy conversion circuit,

The output DC voltage of the energy supply circuit is used as the DC bus voltage V _dc of the coil drive circuit. Under the control of the pulse drive signal generated by the resonant control circuit, the coil drive circuit outputs an AC square wave with frequency f and amplitude of positive and negative V _dc Signal, the AC square wave signal is applied to the resonant circuit composed of the energy transmitting side capacitor bank and the transmitting coil of the energy transmitting subsystem, the frequency of the AC square wave signal is consistent with the frequency of the resonant circuit, thereby generating resonance, so that the The transmitting coil generates magnetic field energy;

The resonant circuit composed of the capacitor bank on the energy receiving side and the receiving coil of the energy receiving subsystem performs magnetic coupling resonance with the magnetic field emitted by the energy transmitting subsystem, and generates electric energy on the receiving coil of the energy receiving subsystem, which is sent to the receiving energy conversion circuit , the input signal is converted into the DC power supply voltage signal required by the load by the receiving energy conversion circuit.

The structure of the energy transmitting subsystem and the energy receiving subsystem is the same,

The energy transmitting subsystem consists of a shielded aluminum plate, an insulating plate, a flat magnetic core, two clamps and a transmission coil.

An insulating plate is set in the center of the shielding aluminum plate, a flat magnetic core is set in the middle of the insulating plate, the two ends of the flat magnetic core are respectively fixed on the insulating plate by a clamp, and the transmission coil is fixed on the flat magnetic core;

The energy emitting subsystem and the energy receiving subsystem are arranged oppositely, and a uniform air gap is left between the energy emitting subsystem and the energy receiving subsystem.

The transmission coil is fixed on the side surface of the air gap of the flat magnetic core, and the transmission coil is a flat coil wound in a helical ring, and the shape of the flat coil is the same as that of the flat magnetic core; or the transmission coil is spiral Wound around the flat magnetic core; the side surfaces of the air gaps of the flat magnetic cores of the energy transmitting subsystem and the energy receiving subsystem are regular polygons, circles or ellipses respectively.

The material of the flat magnetic core is ferromagnetic metal oxide; the thickness of the flat magnetic core ranges from 1mm to 100mm.

The material of the flat magnetic core is nickel zinc ferrite or manganese zinc ferrite.

The relative permeability range of the planar magnetic core is 1000 to 10000.

The transmission coil is made of twisted and insulated odd bundles of ultra-fine enameled wires or silk-covered wires connected in parallel with each other, and each bundle of ultra-fine enameled wires or silk-covered wires includes two incoming wires and two outgoing wires.

The coil driving circuit is a high-frequency full-bridge inverter circuit; the receiving energy conversion circuit is a high-frequency rectification and DC/DC conversion circuit.

The area of the air gap side surface of the planar magnetic core of the energy transmitting subsystem is greater than or equal to the area of the air gap side surface of the planar magnetic core of the energy receiving subsystem.

The capacitors used in the energy transmitting capacitor bank and the energy receiving capacitor bank are both small-volume high-frequency and high-voltage metallized film capacitors, and both the energy transmitting capacitor bank and the energy receiving capacitor bank are composed of capacitor arrays.

The advantages of the present invention are: the core part of the present invention is an energy transmission system composed of two parts, the energy transmitting subsystem and the energy receiving subsystem, wherein the energy transmitting part reaches the set frequency under the drive of the coil drive circuit, and sends out the same frequency to the outside The alternating magnetic field, the energy receiving part generates resonance to receive the magnetic field energy due to the same vibration frequency, and realizes the wireless transmission of energy. Compared with the electromagnetic induction wireless energy transmission technology, the present invention reduces the volume of the device, greatly improves the transmission distance and efficiency; The radiation of the magnetic field is greatly improved, and the transmission power is greatly improved, and high-power and high-efficiency transmission over a long distance is realized.

The transmission distance range of the present invention is 50mm-500mm, the resonant frequency range is 10KHz-1MHz, and the transmission power is 0.5KW-50KW.

The device of the invention is small in size and easy to install, and can withstand a wide range of misalignment between the energy transmitting subsystem and the energy receiving subsystem, and can realize high-efficiency kilowatt-level high-power wireless energy transmission with an efficiency of more than 90%.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a schematic structural view of the transmission coil fixed on the surface of the air gap side of the magnetic core according to the third embodiment;

Fig. 3 is the bottom view of Fig. 2;

Fig. 4 is a schematic structural diagram of the transmission coil wound helically on the magnetic core according to the third embodiment;

Fig. 5 is the bottom view of Fig. 4;

Fig. 6 is the circuit structural diagram of coil driving circuit;

7 is a schematic diagram of the circuit structure of the receiving energy conversion circuit;

Fig. 8 is a schematic structural diagram of an energy transmitting side capacitor bank or an energy receiving side capacitor bank;

Fig. 9 is the circuit schematic diagram of the capacitor bank on the energy transmitting side or the capacitor bank on the energy receiving side;

Fig. 10 is a schematic diagram of a transmission line from an energy source to a transmission coil on a magnetic core;

Figure 11 is a transverse cross-sectional view of the transmission line of the transmission coil; the symbols "·" and "×" indicate the direction of the current;

Fig. 12 is each schematic diagram of the current distribution on the transmission line of the transmission coil;

FIG. 13 is a schematic diagram of the current distribution on the transmission line of the transmission coil.

Detailed ways

Specific Embodiment 1: The present embodiment will be described below in conjunction with FIG. 1 . The magnetic coupling resonant wireless energy transmission device based on the planar magnetic core described in the present embodiment includes an energy supply circuit 1, and it also includes a resonance control circuit 2, a coil drive Circuit 3, energy transmitting side capacitor bank 4, energy transmitting subsystem 5, energy receiving subsystem 6, energy receiving side capacitor bank 7, receiving energy conversion circuit 8,

The output DC voltage of the energy supply circuit 1 is used as the DC bus voltage V _dc of the coil drive circuit 3. Under the control of the pulse drive signal generated by the resonance control circuit 2, the coil drive circuit 3 has an output frequency of f and an amplitude of positive and negative V _dc AC square wave signal, the AC square wave signal is applied to the resonant circuit formed by the energy transmitting side capacitor bank 4 and the transmitting coil of the energy transmitting subsystem 5, the frequency of the AC square wave signal is consistent with the frequency of the resonant circuit, Resonance is thus generated, so that the transmitting coil generates magnetic field energy;

The resonant circuit formed by the energy receiving side capacitor bank 7 and the receiving coil of the energy receiving subsystem 6 performs magnetic coupling resonance with the magnetic field emitted by the energy transmitting subsystem 5, and generates electric energy on the receiving coil of the energy receiving subsystem 6, and the electric energy is sent to The receiving energy conversion circuit 8 converts its input signal into a DC power supply voltage signal required by the load by the receiving energy conversion circuit 8 .

The DC power supply voltage signal output by the receiving energy conversion circuit 8 is directly used to supply power to the load 9 .

In this embodiment, when the energy transmitting subsystem 5 and the energy receiving subsystem 6 perform energy transmission, a large range of misalignment is allowed between them. The resonance control circuit 2 can control the operation, stop and stable power transmission of the wireless energy transmission device as a whole. The device of the present invention works in the state of magnetic coupling resonance, the energy transmitting subsystem 5 and the energy receiving subsystem 6 have a high quality factor, and the energy is transferred by the magnetic field of strong coupling resonance. There is a high coupling coefficient between the transmission coil of the energy transmitting subsystem 5 and the transmission coil of the energy receiving subsystem 6 , and the coupling coefficient will gradually decrease as the distance between the two increases. When the capacitor bank 4 on the energy transmitting side, the energy transmitting subsystem 5, the energy receiving subsystem 6 and the capacitor bank 7 on the energy receiving side are working in the magnetic coupling resonance state, their voltage and current are all standard sine waves, and the voltage and current phase difference is zero, that is , the external performance is purely resistive, and the power on the load reaches the maximum. The load 9 is a mobile device, a device or a rechargeable battery.

The resonant control circuit 2 firstly generates a pulse width modulation (PWM) drive signal, then increases the drive current of the signal through a first-stage push-pull complementary circuit, and finally connects to the MOSFET control terminal through a second-level dedicated isolation drive module, and the PWM drive signal is duty-free The ratio is adjustable, the adjustment range is 5%-95%, the frequency is adjustable, the adjustment range is 0-1MHz.

The energy transmitting part, driven by the coil drive circuit 3, reaches the set frequency, and emits an alternating magnetic field of this frequency to the outside, and its energy is provided by the energy supply circuit 1, and at the same time, the resonance control circuit 2 controls the operation stop and power of the entire device. Stable transmission;

The energy receiving part receives magnetic field energy and performs energy conversion, and finally obtains the required voltage and current power value on the load 9 .

The dotted arrows in Figure 1 illustrate the distribution of magnetic force lines during transmission.

Specific embodiment two: The present embodiment is described below in conjunction with Fig. 2 to Fig. 5, and this embodiment is a further description of the first embodiment, the structure of the energy transmitting subsystem 5 and the energy receiving subsystem 6 is the same,

The energy emission subsystem 5 is composed of a shielding aluminum plate 5-1, an insulating plate 5-2, a flat magnetic core 5-3, two clamping plates 5-4 and a transmission coil 5-5,

An insulating plate 5-2 is set in the center on the shielding aluminum plate 5-1, a flat magnetic core 5-3 is set in the middle on the insulating plate 5-2, and the two ends of the flat magnetic core 5-3 are respectively fixed on the insulating plate by a clamping plate 5-4 5-2, the transmission coil 5-5 is fixed on the flat magnetic core 5-3;

The energy transmitting subsystem 5 and the energy receiving subsystem 6 are arranged oppositely, and a uniform air gap is left between the energy transmitting subsystem 5 and the energy receiving subsystem 6 .

In this embodiment, the planar magnetic core 5-3 has a thin planar shape, at least one of its two bottom surfaces is a flat surface, and is composed of a complete magnetic core or a plurality of small magnetic core parts glued together. The shielding aluminum plate 5-1 has the function of shielding the magnetic field and preventing interference from external equipment. The shielding aluminum plate 5-1 has a thickness of 0.5mm-5mm. The back side of the flat magnetic core 5-3 is provided with an insulating board made of insulating bakelite.

The insulating plate 5-2 plays the role of support and insulation; the two sides of the flat magnetic core 5-3 are fixed with non-metallic clamping plates 5-4 to prevent the vibration generated in the application; the whole energy emission subsystem 5 finally passes through the non-magnetic material The fixing bolts are installed and fixed.

Specific Embodiment Three: The present embodiment will be described below in conjunction with FIGS. 2 to 5. This embodiment is a further description of Embodiment 2. The transmission coil 5-5 is fixed on the air-gap side surface of the flat magnetic core 5-3. The transmission coil 5-5 is a helically wound flat coil, and the shape of the flat coil is the same as that of the flat magnetic core 5-3; or the transmission coil 5-5 is spirally wound around the flat magnetic core 5-3; the side surfaces of the air gaps of the planar magnetic cores 5-3 of the energy transmitting subsystem 5 and the energy receiving subsystem 6 are regular polygons, circles or ellipses, respectively.

The transmission coil 5-5 on the flat magnetic core 5-3 is divided into two types: planar spiral and wound spiral.

The flat magnetic core 5-3 can be selected as a symmetrical shape.

Embodiment 4: This embodiment is a further description of Embodiment 2 or 3. The material of the planar magnetic core 5-3 is a ferromagnetic metal oxide; the thickness of the planar magnetic core 5-3 ranges from 1mm to 100mm .

The flat magnetic core 5-3 is ferromagnetic metal oxide means that the flat magnetic core 5-3 is soft ferrite.

Embodiment 5: This embodiment is a further description of Embodiment 2 or 3. The material of the planar magnetic core 5-3 is nickel-zinc ferrite or manganese-zinc ferrite.

Embodiment 6: This embodiment is a further description of Embodiment 2, 3, 4 or 5. The relative magnetic permeability of the planar magnetic core 5-3 ranges from 1000 to 10000.

Embodiment 7: The present embodiment will be described below in conjunction with FIGS. 10 to 13. This embodiment is a further description of Embodiments 2, 3, 4, 5 or 6. The transmission coils 5-5 are stranded and insulated from each other. The odd number of bundles of ultra-fine enameled wires or silk-covered wires are made in parallel with each other, and each bundle of ultra-fine enameled wires or wire-covered wires includes two incoming wires and two outgoing wires.

The diameter of the single enameled wire is less than or equal to 0.5mm. The outermost layer of the enameled wire harness is wrapped with an insulating tube or a flame-retardant wire.

The structure of the transmission coil 5-5 reduces the uneven distribution of current between adjacent wires to the greatest extent.

Embodiment 8: The present embodiment will be described below in conjunction with FIG. 6 and FIG. 7. This embodiment is a further description of Embodiments 1, 2, 3, 4, 5, 6 or 7. The coil drive circuit 3 is a high-frequency full bridge Inverter circuit; the received energy conversion circuit 8 is a high-frequency rectification and DC/DC conversion circuit.

The receiving energy conversion circuit 8 converts the high-frequency alternating current into direct current, and then performs DC/DC conversion on the direct current controlled by a pulse width modulation signal to step up or step down the voltage to a required value, so as to meet the requirements of electric equipment. The high-frequency rectifier bridge of the receiving energy conversion circuit 8 adopts a high-frequency film capacitor as a rectification filter capacitor.

The coil driving circuit 3 is a high-frequency full-bridge inverter circuit, which is a full-bridge working mode. The power device used is an N-channel MOSFET, and the MOSFET device adopts the RCD absorption circuit and the double-absorption method of the DC bus capacitor, which effectively improves the transmission power of the device and efficiency.

Specific Embodiment Nine: This embodiment is a further description of Embodiments 2, 3, 4, 5, 6, 7 or 8, the area of the air gap side surface of the planar magnetic core 5-3 of the energy emission subsystem 5 Greater than or equal to the area of the air gap side surface of the planar magnetic core 5 - 3 of the energy receiving subsystem 6 .

Specific Embodiment Ten: The following describes this embodiment in conjunction with Fig. 8 and Fig. 9. This embodiment is a further description of Embodiment 1, 2, 3, 4, 5, 6, 7, 8 or 9. The capacitors used in the capacitor bank 4 and the capacitor bank 7 on the energy receiving side are all small-volume high-frequency and high-voltage metallized film capacitors, and the capacitor bank 4 on the energy transmitting side and the capacitor bank 7 on the energy receiving side are both composed of capacitor arrays.

The multiple capacitors are connected in series and parallel to the required resonant capacitance value, and the capacitor bank 4 on the energy transmitting side and the capacitor bank 7 on the energy receiving side adopt a series or parallel structure.

The invention utilizes the magnetic coupling vibration type wireless energy transmission technology, and adopts two electromagnetic systems with the same specific resonance frequency at a certain distance, which generate resonance due to the same vibration frequency, and perform energy transmission. The important advantages of high transmission efficiency and high quality factor of magnetic coupling vibration wireless energy transmission technology are maintained.

The energy transmission side capacitor bank 4 of the present invention and the transmission coil 5-5 of the energy transmission subsystem 5 form an LC oscillating circuit, and its natural frequency is f. Similarly, the energy reception side capacitor bank 7 and the transmission coil of the energy reception subsystem 6 5-5 also constitutes an LC oscillating circuit, the voltage and current on its coil and capacitor are all sine waves, and its natural frequency can be obtained by the formula $f=\frac{1}{2\mathrm{\π}\sqrt{\mathrm{LC}}}$ Configured as f.

Through the action of the coil driving circuit 3, a high-frequency square wave signal with energy is applied to the transmission coil of the energy transmitting subsystem 5, and its frequency is f. Under this excitation, the coil will emit an alternating magnetic field with frequency f into the space, and the electric energy will be converted into magnetic field energy. And due to the addition of the high-permeability magnetic core, the magnetic field is constrained within the range indicated by the dotted line shown in Figure 1 .

The oscillation frequency of the transmission coil of the energy receiving subsystem 6 is consistent with the frequency of the magnetic field in the space, thereby generating magnetic coupling resonance, and obtaining electric energy in the loop composed of the transmission coil and the capacitor bank 7 on the energy receiving side, and the magnetic field energy is reconverted into electric energy, and the space The medium for energy exchange is a resonant alternating magnetic field. This is the energy transmission process of the device of the present invention, which is different from the traditional electromagnetic induction wireless energy transmission method. Since the energy transmission is through resonance with the magnetic field in the space at a specific frequency, and a flat magnetic core with a large transmission area is applied, the transmission system can allow a large range of dislocations and inconsistencies in area and volume, and has great practical Applied meaning.

The invention adopts a flat magnetic core with a large transmission area. Compared with the magnetically coupled resonant wireless energy transmission device without a magnetic core structure, the magnetic field is constrained within the area of the magnetic core, which reduces the leakage of the magnetic field and improves the magnetic field density. , which reduces the frequency required by the system with the same field strength, and greatly reduces the difficulty and cost of the energy supply part and the resonant circuit part.

As shown in Figure 6, firstly, in the coil drive circuit 3, the power frequency alternating current (100V-380V) passes through the uncontrolled rectifier bridge, the high-frequency filter capacitor to filter out the high-frequency harmonic components, and the large-capacity filter capacitor to filter and stabilize the voltage to become DC . The role of the RCD absorption circuit and the bus capacitor in Figure 6 is to eliminate the peak generated during the switching process of the switching tube, reduce the impact on the circuit, and improve the inverter efficiency and power.

As shown in Figure 7, after receiving energy conversion circuit 8, after receiving energy, it first passes through a high-frequency rectification bridge composed of high-frequency rectification diodes, and then passes through a capacitor for filtering and voltage stabilization. Since higher frequencies are easier to achieve filtering and voltage stabilization, so For the capacitor, a high-frequency film capacitor with a smaller volume can be selected, which further reduces the volume of the device. The direct current output by rectification and filtering passes through the DC/DC conversion circuit to boost or step down the voltage to the value required by the electrical equipment, thereby completing the energy reception and conversion.

Fig. 8 and Fig. 9 show the preferred mode of the capacitor bank 4 on the energy transmitting side and the capacitor bank 7 on the energy receiving side in the present invention. Compared with traditional capacitors of equal capacitance, this structure greatly increases the life of the capacitor and the stability of the system, and because of the PCB mounting method, the replacement and debugging of the capacitor are more convenient.

Figures 10 to 13 show the principle and structure of the transmitting, receiving and transmission lines of the present invention.

导线温度100℃时集肤深度传输线线径的选取应小于等于2Δ。本发明中采用绞制的多股极细漆包线或丝包线，又称为利兹线，将这种不均匀电流分布在每根互相绝缘的导线上，最大程度的减小了这一现象引起的交流阻抗值，降低了导线交直流阻抗比R_AC/R_DC，减小了高频状态下线圈上的损耗，降低了线圈温度，提高了能量传输部分的安全性与稳定性。According to Maxwell's theory, when the current I passes through the wire, a magnetic field in the direction of abc and def in Figure 13 is generated, and the planes M and N generate induced electromotive force, and the induced electromotive force generates eddy current in the direction of the conductor length (shown by the dotted line in Figure 13, the main The sum of current and eddy current strengthens on the surface of the wire and tends to weaken toward the center of the wire. The uneven distribution of the current is called the skin effect. The higher the frequency, the more serious this phenomenon is. The usual empirical calculation formula is: skin depth when the wire temperature is 25°C

Skin depth at wire temperature 100°C The selection of transmission line diameter should be less than or equal to 2Δ. In the present invention, twisted multi-strand ultra-fine enameled wires or silk-covered wires, also known as Litz wires, are used to distribute this uneven current on each mutually insulated wire, reducing the damage caused by this phenomenon to the greatest extent. The AC impedance value reduces the AC-DC impedance ratio R _AC /R _DC of the wire, reduces the loss on the coil under high-frequency conditions, reduces the coil temperature, and improves the safety and stability of the energy transmission part.

Furthermore, when the wires pass current in the same direction or in opposite directions, due to the magnetic field between adjacent wires, the currents will attract or repel each other, as shown by the shadows in FIG. 12 . The present invention divides the traditional two transmission lines connected to the coil into multiple segments and rearranges them in the manner shown in Figure 11 to realize the mutual cancellation of the magnetic fields and reduce the above-mentioned uneven current.

Compared with the existing traditional devices or technologies, the present invention has the following advantages: 1. Using a flat magnetic core, it can realize high-power transmission in a small volume, which is convenient for installation and practical application; 2. Using the principle of magnetic coupling resonance, it can Realize long-distance and efficient transmission; 3. Apply a variety of loss-reducing technologies to achieve high-efficiency transmission; 4. Can withstand a wide range of misalignment, effectively improving the convenience of transmission. 4. The working frequency is reduced and the radiation caused by the resonant magnetic field is reduced.

Claims (10)

1. A magnetically coupled resonant wireless energy transmission device based on a flat magnetic core, which includes an energy supply circuit (1), is characterized in that: it also includes a resonance control circuit (2), a coil drive circuit (3), an energy emission side capacitor bank (4), energy transmitting subsystem (5), energy receiving subsystem (6), energy receiving side capacitor bank (7), receiving energy conversion circuit (8), The output DC voltage of the energy supply circuit (1) is used as the DC bus voltage V _dc of the coil drive circuit (3), and the output frequency of the coil drive circuit (3) is f under the control of the pulse drive signal generated by the resonance control circuit (2). , the amplitude is the AC square wave signal of positive and negative Vdc, the AC square wave signal is applied to the resonant circuit formed by the energy transmitting side capacitor bank (4) and the transmitting coil of the energy transmitting subsystem (5), the AC square wave The frequency of the wave signal is consistent with the frequency of the resonant circuit, thereby generating resonance, so that the transmitting coil generates magnetic field energy; The resonant circuit formed by the energy receiving side capacitor bank (7) and the receiving coil of the energy receiving subsystem (6) performs magnetic coupling resonance with the magnetic field emitted by the energy transmitting subsystem (5), and the receiving coil of the energy receiving subsystem (6) The electric energy is generated, and the electric energy is sent to the receiving energy conversion circuit (8), and the receiving energy conversion circuit (8) converts its input signal into a DC power supply voltage signal required by the load. 2. The magnetically coupled resonant wireless energy transmission device based on a flat magnetic core according to claim 1, characterized in that: the energy transmitting subsystem (5) and the energy receiving subsystem (6) have the same structure, The energy emission subsystem (5) consists of a shielded aluminum plate (5-1), an insulating plate (5-2), a flat magnetic core (5-3), two clamping plates (5-4) and a transmission coil (5-5) composition, An insulating plate (5-2) is set in the center on the shielding aluminum plate (5-1), a flat magnetic core (5-3) is set in the middle on the insulating plate (5-2), and the two ends of the flat magnetic core (5-3) respectively pass through A clamping plate (5-4) is fixed on the insulating plate (5-2), and the transmission coil (5-5) is fixed on the flat magnetic core (5-3); The energy emitting subsystem (5) and the energy receiving subsystem (6) are arranged oppositely, and a uniform air gap is left between the energy emitting subsystem (5) and the energy receiving subsystem (6). 3. The magnetically coupled resonant wireless energy transmission device based on a flat magnetic core according to claim 2, characterized in that: the transmission coil (5-5) is fixed on the air gap side of the flat magnetic core (5-3) On the surface, the transmission coil (5-5) is a helically wound planar coil, and the shape of the planar coil is the same as that of the planar magnetic core (5-3); or the transmission coil (5-5 ) is spirally wound on the flat magnetic core (5-3); the air gap side surfaces of the flat magnetic core (5-3) of the energy transmitting subsystem (5) and the energy receiving subsystem (6) are regular polygons respectively , round or oval. 4. The magnetically coupled resonant wireless energy transmission device based on a flat magnetic core according to claim 2 or 3, characterized in that: the material of the flat magnetic core (5-3) is a ferromagnetic metal oxide; The thickness of the magnetic core (5-3) ranges from 1mm to 100mm. 5. The magnetic coupling resonant wireless energy transmission device based on a planar magnetic core according to claim 2 or 3, characterized in that: the material of the planar magnetic core (5-3) is nickel-zinc ferrite or manganese-zinc ferrite. 6. The magnetic coupling resonant wireless energy transmission device based on a planar magnetic core according to claim 2 or 3, characterized in that: the relative magnetic permeability of the planar magnetic core (5-3) ranges from 1000 to 10000. 7. The magnetically coupled resonant wireless energy transmission device based on a flat magnetic core according to claim 2 or 3, characterized in that: the transmission coil (5-5) adopts twisted odd-numbered beams that are insulated from each other and are very thin Enameled wires or silk-covered wires are made in parallel with each other, and each bundle of ultra-fine enameled wires or silk-covered wires includes two incoming wires and two outgoing wires. 8. The magnetically coupled resonant wireless energy transmission device based on a flat magnetic core according to claim 1, characterized in that: the coil driving circuit (3) is a high-frequency full-bridge inverter circuit; the receiving energy conversion circuit (8 ) is a high-frequency rectification and DC/DC conversion circuit. 9. The magnetically coupled resonant wireless energy transmission device based on a planar magnetic core according to claim 2 or 3, characterized in that: the air gap of the planar magnetic core (5-3) of the energy emission subsystem (5) The area of the side surface is greater than or equal to the area of the side surface of the air gap of the planar magnetic core (5-3) of the energy receiving subsystem (6). 10. The magnetically coupled resonant wireless energy transmission device based on a planar magnetic core according to claim 1, characterized in that: the capacitor bank (4) on the energy transmitting side and the capacitor bank (7) on the energy receiving side adopt the same capacitance It is a small-volume, high-frequency, high-voltage metallized film capacitor, and the capacitor bank (4) on the energy transmitting side and the capacitor bank (7) on the energy receiving side are both composed of capacitor arrays.

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