CN111799895A - Magnetic coupling structure and wireless power transmission system - Google Patents

Magnetic coupling structure and wireless power transmission system Download PDF

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Publication number
CN111799895A
CN111799895A CN202010677818.2A CN202010677818A CN111799895A CN 111799895 A CN111799895 A CN 111799895A CN 202010677818 A CN202010677818 A CN 202010677818A CN 111799895 A CN111799895 A CN 111799895A
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magnetic
coil
primary
magnetic energy
core layer
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CN111799895B (en
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夏晨阳
杨旭浩
李晓丽
李壮
冯其凯
魏楠
韩潇左
马帅
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China University of Mining and Technology CUMT
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/40—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices
    • H02J50/402—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/70—Circuit arrangements or systems for wireless supply or distribution of electric power involving the reduction of electric, magnetic or electromagnetic leakage fields

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  • Computer Networks & Wireless Communication (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

The invention provides a magnetic coupling structure and a wireless power transmission system, wherein the magnetic coupling structure comprises a primary magnetic energy emission structure and a secondary magnetic energy pickup structure: the primary magnetic energy transmitting structure is a double-sided common core structure and comprises a first magnetic core layer in the middle, and a first coil and a second coil which are respectively paved on the front surface and the back surface of the first magnetic core layer; the two secondary magnetic energy pickup structures are respectively a front magnetic energy pickup structure and a back magnetic energy pickup structure, the two secondary magnetic energy pickup structures are arranged on two sides of the primary magnetic energy emission structure in parallel, and the two secondary magnetic energy pickup structures are respectively coupled with the primary magnetic energy emission structure. The wireless power transmission system adopts the magnetic coupling structure, and can realize power transmission of two secondary power receiving circuits by only using one magnetic core layer, thereby greatly reducing the use amount of magnetic cores on the coupling mechanism and improving the utilization rate of the magnetic cores and the magnetic coupling efficiency.

Description

Magnetic coupling structure and wireless power transmission system
Technical Field
The invention relates to the technical field of wireless power transmission, in particular to a magnetic coupling structure and a wireless power transmission system.
Background
The wireless power transmission technology is a new mode for completely getting rid of the constraint of wires or cables by means of space intangible soft media (such as magnetic fields, electric fields, lasers, microwaves and the like), realizing wireless power transmission and flexible power access, has greater cleanness, flexibility and safety, is regarded as an important way for realizing clean, flexible and efficient energy utilization, and is widely concerned and researched by the international society. The traditional wireless power transmission is in a single-pair single mode, the output power and the efficiency of the whole system are low, a magnetic core layer in a primary power transmitting coil cannot be fully utilized, and the coupling performance is poor.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to overcome the defects of the prior art and provides a double-sided concentric magnetic coupling structure capable of transmitting electric energy in a double-sided mode and a wireless electric energy transmission system based on the double-sided concentric magnetic coupling structure.
The technical scheme is as follows: the invention provides a magnetic coupling structure and a wireless power transmission system, and aims to solve the technical problems of low magnetic core utilization rate and poor coupling performance of a single-pair single-magnetic coupling structure adopted in the conventional wireless power transmission system.
In a first aspect, a magnetic coupling structure is provided, which includes a primary magnetic energy emission structure and a secondary magnetic energy pickup structure; the primary magnetic energy transmitting structure is a double-sided common core structure and comprises a first magnetic core layer in the middle, and a first coil and a second coil which are respectively paved on the front surface and the back surface of the first magnetic core layer; the two secondary magnetic energy pickup structures are respectively a front magnetic energy pickup structure and a back magnetic energy pickup structure, the two secondary magnetic energy pickup structures are symmetrically and parallelly arranged on two sides of the primary magnetic energy emission structure, and the two secondary magnetic energy pickup structures are respectively coupled with the primary magnetic energy emission structure.
The magnetic coupling structure is applied to a wireless power transmission system, wherein the primary magnetic energy transmitting structure is arranged in a primary power transmitting circuit of the wireless power transmission system, the secondary magnetic energy picking structure is arranged in a secondary power receiving circuit, and because the number of the secondary magnetic energy picking structures is two, the number of the corresponding secondary power receiving circuits is also two. The primary side magnetic energy transmitting structure loads high-frequency alternating current in the primary side electric energy transmitting circuit to the first coil and the second coil to form a high-frequency magnetic field, the secondary side electric energy receiving circuit induces the high-frequency magnetic field through the secondary side magnetic energy picking-up structure and generates electric energy, and the received electric energy is converted into required voltage through modulation to supply power to a load. Therefore, compared with a single-to-single magnetic coupling structure, the magnetic coupling structure reduces the volume and the weight of the magnetic coupling mechanism, reduces the usage amount of magnetic cores on the coupling mechanism, and further reduces the construction cost of the whole wireless power transmission system.
In a possible implementation manner, the front magnetic energy pickup structure includes a second magnetic core layer and a third coil laid on any side of the second magnetic core layer, and the third coil faces the first coil; the reverse magnetic energy pickup structure comprises a third magnetic core layer and a fourth coil laid on any surface of the third magnetic core layer, and the fourth coil faces the second coil.
The coupling effect of the whole coupling structure can be better improved through the secondary magnetic energy pickup structure matched with the shape and the structure height of the primary magnetic energy emission structure.
In one possible implementation, the first coil, the second coil, the third coil and the fourth coil are DD-type coils. The DD coil has the advantages of high power transmission efficiency, high anti-offset performance, and the like, and is widely used in magnetic coupling mechanisms of various types of wireless charging devices, but the implementation method is not limited to the DD coil, the square coil, the circular coil, and the like.
In one possible implementation, the magnetic core layer is composed of a plurality of ferrite strips which are arranged on the same plane in parallel at equal intervals. The method of replacing the plate-shaped magnetic core by the ferrite rod can optimize the structure of the magnetic core, and is convenient for balancing between the use amount of the magnetic core and the coupling coefficient.
In a second aspect, a wireless power transmission system is provided, including: the primary side electric energy transmitting circuit and the secondary side electric energy receiving circuit are connected with a power grid; the primary side electric energy transmitting circuit comprises two primary side resonance compensation circuits, namely a first primary side resonance compensation circuit and a second primary side resonance compensation circuit; the two secondary side electric energy receiving circuits are coupled and connected with the primary side electric energy transmitting circuit through the magnetic coupling structure; the first coil of the primary magnetic energy transmitting structure is connected with the first primary resonance compensation circuit, and the high-frequency alternating current of the primary side is loaded to the first coil through the first primary resonance compensation circuit; a second coil of the primary magnetic energy transmitting structure is connected with a second primary resonance compensation circuit, and high-frequency alternating current of a primary side is loaded to the second coil through the second primary resonance compensation circuit;
the two secondary magnetic energy pickup structures are respectively used as receiving coils of the two secondary electric energy receiving circuits and are in coupling connection with the corresponding primary coils.
Has the advantages that: compared with the prior art, the invention has the following advantages:
the invention can improve the utilization rate of the magnetic core of the primary magnetic energy transmitting structure in the wireless electric energy transmission system, can realize the electric energy transmission of two secondary electric energy receiving circuits by only utilizing one magnetic core layer, greatly reduces the magnetic core consumption on the coupling mechanism, and reduces the construction cost of the whole system.
Drawings
Fig. 1 is a schematic view of a magnetic coupling structure according to embodiment 1;
fig. 2 is a structural diagram of a wireless power transmission system relating to embodiment 2;
fig. 3 is an equivalent circuit diagram of a wireless power transmission system according to embodiment 2;
fig. 4 is a result of scanning parameters of a magnetic coupling structure in the wireless power transmission system according to embodiment 2;
fig. 5 is a schematic view of a magnetic coupling structure using different ferrite rods as magnetic core layers according to example 2;
fig. 6 is a diagram showing a variation in coupling coefficient of a magnetic coupling structure in the wireless power transmission system according to embodiment 2, in which different ferrite rods are used as magnetic core layers;
FIG. 7 is a schematic view of a closed-loop control principle according to embodiment 2;
fig. 8 is a waveform diagram of equivalent voltage and equivalent current output by the front side and the back side of the primary magnetic energy emission structure under load disturbance in the wireless power transmission system related to embodiment 2;
fig. 9 is a waveform diagram of equivalent voltage and equivalent current output by the front side and the back side of the primary magnetic energy emission structure under modal change in the wireless power transmission system according to embodiment 2.
Detailed Description
The terminology used in the following embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting
The application is limited. As used in the examples of this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It should be noted that the terms "upper", "lower", "left", "right", and the like used in the embodiments of the present application are described in terms of the angles shown in the drawings, and should not be construed as limiting the embodiments of the present application. In addition, in this context, it will also be understood that when an element is referred to as being "on" or "under" another element, it can be directly on "or" under "the other element or be indirectly on" or "under" the other element via an intermediate element.
In the existing wireless power transmission system, a single-pair single-mode magnetic coupling structure is generally adopted, namely, only one surface of a primary side transmitting pad is coupled with a secondary side receiving pad, and the structure has the disadvantages of low magnetic core utilization rate and poor magnetic coupling effect.
In view of the above, embodiments of the present application provide a magnetic coupling structure and a wireless power transmission system, which can solve the above technical problems.
Example 1
Fig. 1 shows a magnetic coupling structure proposed in embodiment 1, including: the device comprises a primary magnetic energy transmitting structure and a secondary magnetic energy picking structure; the primary magnetic energy transmitting structure is a double-sided common core structure and comprises a first magnetic core layer in the middle, and a first coil and a second coil which are respectively paved on the front surface and the back surface of the first magnetic core layer; the two secondary magnetic energy pickup structures are respectively a front magnetic energy pickup structure and a back magnetic energy pickup structure, the two secondary magnetic energy pickup structures are arranged on two sides of the primary magnetic energy emission structure in parallel, and the two secondary magnetic energy pickup structures are respectively coupled with the primary magnetic energy emission structure; the front magnetic energy pickup structure comprises a second magnetic core layer and a third coil laid on any surface of the second magnetic core layer, and the third coil faces the first coil; the reverse magnetic energy pickup structure comprises a third magnetic core layer and a fourth coil laid on any surface of the third magnetic core layer, and the fourth coil faces the second coil.
In the magnetic coupling structure provided in this embodiment, the first coil and the second coil share a magnetic core layer, the first coil is coupled to the third coil, and the second coil is coupled to the fourth coil. Through the design, the primary magnetic energy transmitting structure can realize the electric energy transmission of the two secondary magnetic energy pickup structures by only utilizing one magnetic core layer, and the utilization rate of the magnetic core is fully improved.
The first coil, the second coil, the third coil and the fourth coil are DD-type coils, each DD-type coil is composed of two rectangular coils, each rectangular coil is formed by winding litz wires, and the litz wires of the two rectangular coils are wound in the same direction. It should be noted that the DD coil is only a preferred embodiment, and coils with other shapes can be applied to the present invention.
In addition, the magnetic layer in this embodiment is composed of a plurality of ferrite bars arranged in parallel at equal intervals on the same plane. The method of replacing the plate-shaped magnetic core by the ferrite rod can optimize the structure of the magnetic core, and is convenient for balancing between the use amount of the magnetic core and the coupling coefficient. The number of the magnetic core layers can be set according to requirements, for example, 4, 5, 6, 7, 8, 9, and the like, and 6 is preferred in this embodiment.
Example 2
The present invention further provides a wireless power transmission system, which substitutes into the charging background of the electric vehicle in this embodiment, and provides a wireless power transmission system for charging an electric vehicle, as shown in fig. 2, including: the power grid comprises a power grid access end, a primary side AC-DC rectifying device, a primary side DC-AC high-frequency inverter device, a primary side resonance compensation circuit, the magnetic coupling mechanism, a secondary side resonance compensation circuit, a secondary side AC-DC rectifying device, a DC-DC converter and a battery load, wherein the primary side AC-DC rectifying device and the primary side DC-AC high-frequency inverter device can be collectively called as a primary side electric energy conversion device, and the secondary side AC-DC rectifying device and the DC-DC converter are collectively called as a secondary side electric energy conversion device.
In this embodiment, the primary side DC-AC high frequency inverter device is composed of four fully controlled switching tubes and their anti-parallel diodes, and other primary side DC-AC high frequency inverter devices may be adopted.
In this embodiment, there are two primary side resonance compensation circuits, which are a first primary side resonance compensation circuit and a second primary side resonance compensation circuit respectively; the number of the secondary side resonance compensation circuits is also two, and the two secondary side resonance compensation circuits are respectively a first secondary side resonance compensation circuit and a second secondary side resonance compensation circuit. Wherein the first primary side resonance compensation circuit is composed of an inductor L11Primary side compensation capacitor Cp1And self-inductance L of the first coilp1Composition is carried out; the second primary side resonance compensation circuit is composed of an inductor L21Primary side compensation capacitor Cp2And self-inductance L of the second coilp2Composition is carried out; the first secondary resonance compensation circuit is composed of self-inductance L of the third coils1And secondary side compensation capacitor Cs1Composition is carried out; the second secondary side resonance compensation circuit is composed of self-inductance L of the fourth coils2And secondary side compensation capacitor Cs2And (4) forming.
The first secondary side AC-DC rectifying device and the second secondary side AC-DC rectifying device are respectively connected with the first secondary side resonance compensation circuit and the second secondary side resonance compensation circuit; the DC-DC converter is also provided with two DC-DC converters, wherein the first DC-DC converter is connected with the first secondary side AC-DC rectifying device, and the second DC-DC converter is connected with the second secondary side AC-DC rectifying device. The first DC-DC converter comprises a first buck converter comprising a switching tube S1Inductance L1And a capacitor C1(ii) a The second DC-DC converter comprises a second buck converter comprising a switching tube S2Inductance L2And a capacitor C2。
In this embodiment, the batteries of the two electric vehicles can be charged simultaneously, and it is noted that the batteries of the two electric vehicles are respectively the first battery load and the second battery load, then the first battery load is connected to the output end of the first DC-DC converter, and the second battery load is connected to the output end of the second DC-DC converter.
In this embodiment, the primary AC-DC rectifying device is configured to rectify an AC voltage input from the grid connection terminal into a DC voltage; the primary side DC-AC high-frequency inverter device converts the received direct-current voltage into high-frequency alternating current, the output end of the primary side DC-AC high-frequency inverter device loads the high-frequency alternating current to the first transmitting coil through the first primary side resonance compensation circuit, and a high-frequency magnetic field is generated through the first coil; the third coil induces the high-frequency magnetic field to generate electric energy, the electric energy is output to the first DC-DC converter through the first secondary resonance compensation circuit and the first secondary AC-DC rectification circuit in sequence to be regulated, and finally the electric energy is regulated into stable direct-current voltage to supply power to the first battery load according to needs. The other output end of the primary side DC-AC high-frequency inverter loads high-frequency alternating current to a second coil through a second primary side resonance compensation circuit, and a high-frequency magnetic field is generated through the second coil; the fourth coil generates electric energy after inducing the high-frequency magnetic field, the fourth coil outputs the electric energy to the second DC-DC converter through the second secondary resonance compensation circuit and the second secondary AC-DC rectification circuit in sequence for voltage regulation, and finally the electric energy is regulated into stable direct-current voltage to supply power to the second battery load according to the requirement.
In this embodiment, the first primary resonant compensation circuit, the second primary resonant compensation circuit, and the primary magnetic energy transmission structure share one set of DC-AC high-frequency inverter, but different high-frequency inverters may also be used here.
The parameter design process of the wireless power transmission system described in this embodiment is as follows:
step 1, constructing an equivalent circuit of the wireless power transmission system in the embodiment, as shown in fig. 3, wherein an a-plane is a front surface of the primary magnetic energy emission structure, and the a-plane equivalent circuit is an equivalent circuit in which the first coil and the third coil are coupled; the b surface is the reverse surface of the primary magnetic energy transmitting structure, and the b surface equivalent circuit is an equivalent circuit coupling the second coil and the fourth coil.
Step 2, based on the KVL theorem, an output power and efficiency expression of the wireless power transmission system shown in FIG. 2 can be obtained, and according to the output power and efficiency expression, expected mutual inductance between the front and back coils (the first coil and the second coil) of the primary magnetic energy transmitting structure and the coil of the secondary magnetic energy pickup structure can be determined; the positive power output and efficiency expression of the primary magnetic energy emission structure is as follows:
Figure BDA0002583124880000061
Figure BDA0002583124880000062
wherein, I3Representing the effective value of the current flowing through the first coil, omega being the angular frequency of operation of the system, M13Is the mutual inductance between the first coil and the third coil, L11Compensation inductance, U, in series on the primary side of an a-plane circuitinFor the direct voltage output by the primary-side AC-DC rectifier means, ZsEquivalent of front magnetic energy pickup structureImpedance, ZinIs the input impedance of an equivalent circuit, ZrReflecting impedance R of the front magnetic energy pickup structure on one side of the primary electric energy transmitting end1Parasitic resistance, R, self-inductance of the first coilL1Is the equivalent resistance of the first battery load, I11The effective value of the current flowing through the series compensation inductor in the first primary side resonance compensation circuit.
Similarly, the power output and transfer efficiency of the opposite side can be deduced:
Figure BDA0002583124880000063
wherein, I4Representing the effective value of the current flowing through the fourth coil, omega being the angular frequency of operation of the system, M24Is the mutual inductance value, L, between the second coil and the fourth coil on the reverse side21Compensation inductance, Z, in series at the primary side in a b-plane circuitsEquivalent impedance for reverse magnetic energy pickup structure, ZinIs the input impedance of an equivalent system, ZrThe reflected impedance R of a circuit at one side of a reverse magnetic energy pickup structure at a primary side transmitting end2Parasitic resistance, R, being self-inductance of the second coilL2Is the equivalent resistance of the second battery load, I21The effective value of the current flowing through the series compensation inductor in the second primary side resonance compensation circuit.
From the above analysis, the total transmission efficiency of the whole system can be obtained:
Figure BDA0002583124880000071
step 3, designing specific parameters of the magnetic coupling structure, such as coil size, magnetic core size and the like according to the total transmission efficiency required to be achieved:
selecting the wire diameter of the DD coil based on the current flowing through the primary side transmitting coil;
controlling the outer diameters of all the DD coils to be the same, and determining the size of an initial coil according to the size of the coil;
the strip-shaped ferrite is configured based on the external scene of the coil, the long side direction of the strip-shaped ferrite is in the same direction as the magnetic flux direction of the DD coil, the length of the strip-shaped ferrite is equal to the outer diameter length in the same direction as the magnetic flux direction of the DD coil, and the design of the width, the thickness and the number of the strip-shaped ferrite does not have uniqueness;
controlling the number of turns of the primary side transmitting coil and the secondary side pickup coil to achieve a desired mutual inductance value M13And M24；
And if the expected mutual inductance cannot be achieved by controlling the number of turns of the coil, enlarging the size of the coil, repeating the steps and reconfiguring.
In this embodiment, in the process of configuring the magnetic coupling structure, a control variable method is further applied to optimize the double-sided concentric wireless power transmission coupling mechanism.
FIG. 4 shows the results of a parameter scan after a fine adjustment of the core size by Maxwell. The highest coupling coefficient was obtained when the core length was 420mm and the width was 250 mm. In the design process of an ICPT system, a ferrite rod is commonly used to replace a plate-shaped magnetic core to optimize the structure of the magnetic core, which requires a trade-off between the amount of the magnetic core and the coupling coefficient. The ferrite rod used in this embodiment has a length of 420mm, a width of 20mm and a thickness of 10 mm. Fig. 5 is a schematic diagram of simulation models with different numbers of ferrite strips, and the corresponding simulation results are shown in fig. 6. The results indicate that the greater the number of ferrite rods, the greater the coupling coefficient. However, the relationship is not linear, and the increase of the coupling coefficient k becomes gradually smaller as the number of the ferrite strips increases. In this embodiment, 6 ferrite rods are selected as the magnetic core layer of the primary magnetic energy emission structure. Although placing more ferrite can achieve a higher coupling coefficient, this is not necessary and in practice the bulk, cost and performance of ferrite must be balanced.
For an open-loop system, the control accuracy of the system is limited, the system is easily affected by external interference, and obviously, the requirement of stable system output cannot be met, so that a feedback link must be introduced for closed-loop control. In the embodiment, the Buck circuit adopts a PID controller to form a closed-loop control system, fig. 7 is a system block diagram of the closed-loop system, the working environment of the wireless power transmission system is not ideal in practical engineering application, the models of electric vehicles are various, and the loads of the a side and the b side are different in most cases, so that the capability of stably supplying power to loads of different sizes is necessary for the system. Fig. 8 shows that under the load condition that the a side and the b side have different powers, the system can still output stable voltage and current by means of the Buck converter on the secondary side. The closed-loop control effect is ideal, and the output voltage reaches the design requirement. In the actual process, charging on the front side and the back side of the double-sided system is not started synchronously, so that the problem of mode switching is involved. The front side charges the electric automobile, and the back side is the next automobile, namely the system is switched from a single working mode to a double working mode; or the front side and the back side charge the automobile at the same time, and the vehicle on the back side is charged and leaves, namely the system is switched from a double-working mode to a single-working mode. The two situations are inevitably and widely existed in the whole operation process of the double-sided common-core wireless charging system, so that the simulation research on the mode switching is indispensable, and if the stability of the system during the mode switching does not meet the requirement, the safety of one-sided or two-sided load is seriously influenced. Fig. 9 shows the output current-voltage model during mode switching, and the simulation completes normal startup at 0.025s, and it can be seen from fig. 9 that the system enters the single working mode. When the load on the back side is put into the simulation system at 0.08 second, the process that the simulation system is switched from the single working mode to the double working mode can be seen, the back side rapidly reaches the normal output voltage, and the output voltage on the front side only has tiny fluctuation, which indicates that the system still has good stability when the mode is switched; the process that the system is switched from the double-working mode to the single-working mode is simulated by disconnecting the back-side load at 0.15s, the back-side output voltage drops to 0V rapidly after switching according to the graph of FIG. 9, the fact that the back-side vehicle finishes charging and leaves is shown, and the front-side output voltage is almost not fluctuated, which shows that the system has little influence on the system when being switched from the double-working mode to the single-working mode, and the actual application requirements are met. In conclusion, the system can keep a good working state during mode switching, which indicates that the closed-loop buck converter has good regulation performance.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.

Claims (6)

1. A magnetic coupling structure comprises a primary magnetic energy transmitting structure and a secondary magnetic energy picking structure, and is characterized in that:
the primary magnetic energy transmitting structure is a double-sided common core structure and comprises a first magnetic core layer in the middle, and a first coil and a second coil which are respectively paved on the front surface and the back surface of the first magnetic core layer;
the two secondary magnetic energy pickup structures are respectively a front magnetic energy pickup structure and a back magnetic energy pickup structure, the two secondary magnetic energy pickup structures are arranged on two sides of the primary magnetic energy emission structure in parallel, and the two secondary magnetic energy pickup structures are respectively coupled with the primary magnetic energy emission structure.
2. A magnetic coupling structure according to claim 1, wherein:
the front magnetic energy pickup structure comprises a second magnetic core layer and a third coil laid on any surface of the second magnetic core layer, and the third coil faces the first coil; the reverse magnetic energy pickup structure comprises a third magnetic core layer and a fourth coil laid on any surface of the third magnetic core layer, and the fourth coil faces the second coil.
3. A magnetic coupling structure according to claim 2, wherein: the first coil, the second coil, the third coil and the fourth coil are DD-type coils.
4. A magnetic coupling structure according to claim 3, wherein: the DD-type coil is composed of two rectangular coils, the two rectangular coils are formed by winding litz wires, and the litz wires of the two rectangular coils are wound in the same direction.
5. A magnetic coupling structure according to claim 3, wherein: the magnetic core layer is composed of a plurality of ferrite strips which are arranged on the same plane in parallel at equal intervals.
6. A wireless power transfer system comprising: connect electric wire netting's primary side electric energy transmitting circuit and vice limit electric energy receiving circuit, its characterized in that:
the primary side electric energy transmitting circuit comprises two primary side resonance compensation circuits, namely a first primary side resonance compensation circuit and a second primary side resonance compensation circuit;
the number of the secondary side electric energy receiving circuits is two, and the two secondary side electric energy receiving circuits are coupled and connected with the primary side electric energy transmitting circuit through the magnetic coupling structure of any one of claims 1 to 5; the first coil of the primary magnetic energy transmitting structure is connected with the first primary resonance compensation circuit, and the high-frequency alternating current of the primary side is loaded to the first coil through the first primary resonance compensation circuit; a second coil of the primary magnetic energy transmitting structure is connected with a second primary resonance compensation circuit, and high-frequency alternating current of a primary side is loaded to the second coil through the second primary resonance compensation circuit;
the two secondary magnetic energy pickup structures are respectively used as receiving coils of the two secondary electric energy receiving circuits and are in coupling connection with the corresponding primary coils.
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Cited By (3)

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Publication number Priority date Publication date Assignee Title
CN112564309A (en) * 2020-11-30 2021-03-26 西安交通大学 Compact wireless charging system based on multi-coil decoupling integration
CN112865328A (en) * 2020-12-28 2021-05-28 北京交通大学 Wireless power transmission system and efficiency optimization method thereof
CN112959902A (en) * 2021-02-09 2021-06-15 哈尔滨工业大学（威海） Array type magnetic coupling transmitting device and system and unmanned aerial vehicle charging method

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