Anti-offset magnetic coupling mechanism based on double-layer vertical DD coil and electric energy transmission system

Abstract

The utility model belongs to the technical field of wireless electric energy transmission, and relates to an anti-offset magnetic coupling mechanism based on a double-layer vertical DD coil and an electric energy transmission system. The anti-offset magnetic coupling mechanism comprises a transmitting end and a receiving end which are oppositely arranged; the transmitting end comprises a primary side D1 coil, a primary side supporting isolation plate, a primary side D2 coil and a primary side magnetic core which are sequentially arranged from top to bottom; the receiving end comprises a secondary side D3 coil, a secondary side supporting isolation plate, a secondary side D4 coil and a secondary side magnetic core which are sequentially arranged from top to bottom; the primary side magnetic core and the secondary side magnetic core are oppositely arranged; the primary side coil D1 and the primary side coil D2 are wound in a same-direction and scattered manner and are vertically and orthogonally arranged; the secondary side coil D3 and the secondary side coil D4 are wound in the same direction in a scattered manner and are vertically and orthogonally arranged; the primary side D1 coil is coupled with the secondary side D4 coil, and the primary side D2 coil is coupled with the secondary side D3 coil. Therefore, the double-layer vertical DD coil structure has high anti-offset capability in the X direction and the Y direction.

Description

TECHNICAL FIELD

[0001] The utility model belongs to wireless power transmission technical field relates to a kind of anti-deviation magnetic coupling mechanism and power transmission system based on double-layer vertical DD coil. BACKGROUND

[0002] Wireless power transmission technology has made significant progress in recent years in the application of power storage and mobile device charging and other fields, becoming an important technical means to replace traditional wired power transmission. Compared with traditional wired transmission mode, wireless power transmission system has many advantages, such as avoiding the instability brought by wire contact, improving the flexibility and convenience of the device in the charging process, and reducing the risk of electric shock and fire. Wireless power transmission technology transmits energy through electromagnetic coupling, which can provide stable power supply for mobile devices without plugging and unplugging the wire. Especially in complex or narrow environment, wireless power transmission system shows high adaptability and convenience, and more and more practical application fields begin to adopt this technology. However, one of the main problems faced by wireless power transmission system in practical application is the deviation of magnetic coupling mechanism. Since the primary coil position is usually fixed, while the secondary coil is installed in the power device, the position of the secondary coil may deviate horizontally and vertically, i.e. X direction and Y direction, due to the movement of the device. At this time, the relative position between the coupling coils changes, causing the distribution of magnetic field and electromagnetic parameters to fluctuate sharply, which affects the power transmission efficiency and system stability, and may even cause serious problems such as circuit detuning and energy loss. In the research of improving the anti-deviation ability of wireless power transmission system, the academic circle has put forward various schemes. Common technical means include solving the deviation problem through control strategy, compensation topology, modal switching and magnetic coupler design. Although control strategy, compensation topology and modal switching method can improve the anti-deviation ability of the system, these methods usually increase the control complexity of the system, increase the number of passive components, and thus lead to the increase of system cost, size and limited applicability. Therefore, the design of magnetic coupler is considered as an effective way to improve the anti-deviation ability. At present, some innovative magnetic coupler designs have made significant progress in anti-deviation performance. For example, DD coil structure can effectively improve the magnetic coupling coefficient and increase the effective charging area by placing two D-shaped coils wound in different directions in series and side by side, thus improving the anti-deviation ability of the system. Further research proposes a design based on the same layer vertical DD magnetic coupling mechanism, and combines with LCC-S composite compensation network to realize the stability of system output voltage when the magnetic coupling mechanism deviates. In addition, DDQ coil and double-layer DD coil and other improved designs also successfully compensate for the induction blind area that may occur when DD coil deviates, further enhancing the anti-deviation performance of the system.

[0003] However, existing D-shaped coils, DDQ coils, and vertical DD coils on the same layer have very weak anti-offset capability in one direction due to the characteristics of magnetic field distribution, and cannot achieve anti-offset in both the X and Y directions of a two-dimensional plane. Furthermore, they all adopt a tight winding method, and the magnetic induction intensity of tightly wound coils exhibits uneven spatial distribution, with dense intensity on both sides and insufficient intensity in the central region. Utility Model Content

[0004] The purpose of this invention is to solve the technical problem that the anti-offset capability of the coil in the prior art is very weak in one direction due to the magnetic field distribution characteristics, and it is impossible to achieve anti-offset in both the X and Y directions of the two-dimensional plane. The invention provides an anti-offset magnetic coupling mechanism and power transmission system based on a double-layer vertical DD coil.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] In a first aspect, this utility model discloses an anti-offset magnetic coupling mechanism based on a double-layer vertical DD coil, comprising a transmitter and a receiver arranged opposite to each other; the transmitter includes a primary side D1 coil, a primary side support isolation plate, a primary side D2 coil, and a primary side magnetic core arranged sequentially from top to bottom; the receiver includes a secondary side D3 coil, a secondary side support isolation plate, a secondary side D4 coil, and a secondary side magnetic core arranged sequentially from top to bottom; the primary side magnetic core and the secondary side magnetic core are arranged opposite to each other; the primary side D1 coil and the primary side D2 coil are wound in the same direction and are arranged perpendicularly and orthogonally; the secondary side D3 coil and the secondary side D4 coil are wound in the same direction and are arranged perpendicularly and orthogonally; the primary side D1 coil and the secondary side D4 coil are coupled, the primary side D2 coil and the secondary side D3 coil are coupled, and the magnetic lines of force of the double-layer coils on the same side are perpendicular to each other and do not interfere with each other.

[0007] Further improvements are made in the following aspects:

[0008] The primary side D1 coil, primary side D2 coil, secondary side D3 coil, and secondary side D4 coil are all composed of two layers of mutually perpendicular DD coils stacked together.

[0009] The primary coil D1 and the primary coil D2 are connected in series; the secondary coil D3 and the secondary coil D4 are connected in series.

[0010] The two DD coils among the primary D1 coil, primary D2 coil, secondary D3 coil, and secondary D4 coil have the same length, width, and number of turns.

[0011] Both the primary and secondary magnetic cores are cross-shaped.

[0012] The primary and secondary magnetic cores are made of ferrite, silicon steel sheets, or iron-nickel alloy materials.

[0013] The primary side support isolation plate and the secondary side support isolation plate are made of acrylic, glass, ceramic or polycarbonate material.

[0014] In the second aspect, the utility model discloses a kind of power transmission systems using the above anti-deviation magnetic coupling mechanism based on double-layer vertical DD coil, it is characterized by, including the direct current power supply, primary side full-bridge inverter circuit, primary side LCC-S compensation network and the transmitting end that are sequentially electrically connected;The transmitting end is connected by magnetic coupling with receiving end, and the receiving end is sequentially electrically connected with secondary side LCC-S compensation network, secondary side bridge rectifier circuit and equivalent load resistance.

[0015] The primary side LCC-S compensation network and the secondary side LCC-S compensation network respectively include inductance, capacitance and series resonance capacitor, for adjusting the resonant frequency of system, to realize high efficient power transmission.

[0016] Including control system, for monitoring and adjusting the output of direct current power supply, the working state of primary side full-bridge inverter circuit, the compensation parameter of primary side LCC-S compensation network and secondary side LCC-S compensation network, and the output of management secondary side bridge rectifier circuit, for optimizing the overall performance and efficiency of system.

[0017] Compared with prior art, the utility model has the following beneficial effects:

[0018] The utility model discloses a kind of anti-deviation magnetic coupling mechanisms based on double-layer vertical DD coil, transmitting end and receiving end are respectively using double-layer coil structure, and coil is vertically orthogonal arrangement, this design makes that magnetic line is more evenly distributed in two-dimensional plane, to significantly enhance the anti-deviation ability of system in X and Y two directions.Even in transmitting end and receiving end between there is a certain degree of misregistration, can ensure the stable transmission of electric energy. Primary side D1 coil and secondary side D4 coil, primary side D2 coil and secondary side D3 coil respectively produce coupling, this double-layer coupling mode not only optimizes magnetic field distribution, also reduces the loss of energy in transmission process, improves overall transmission efficiency.Meanwhile, the magnetic force line of same side double-layer coil is mutually perpendicular, mutually does not interfere, further guarantee the stability of transmission. Since the utility model has excellent anti-deviation ability in two-dimensional plane, therefore applicable to various complex application scenarios, such as mobile device charging, unmanned aerial vehicle aerial charging etc..In addition, the design of double-layer coil also provides higher flexibility and scalability for system, facilitate to customize and optimize according to different needs.Summarized above, the utility model uses the way of double-layer vertical DD coil cross arrangement, i.e. two DD coils are vertically orthogonal arrangement, since their magnetic force line is also mutually perpendicular and orthogonal under this arrangement, mutually does not interfere, mutually does not affect. Make its primary side and secondary side cross mutual inductance between there is strong complementary effect, so that double-layer vertical DD coil structure in X and Y two directions all has strong anti-deviation ability, greatly widens the application scenario of magnetic coupling mechanism.

[0019] Further, the magnetic induction intensity distribution characteristics of the loosely wound coil are different due to the existence of a certain spacing between the turns of the coil, and the dense points thereof are more inclined to the central region of the coil. This makes the magnetic induction intensity of the loosely wound coil more evenly distributed in space, thereby effectively compensating for the insufficient magnetic induction performance in the central region of the tightly wound coil, providing a new idea for optimizing the magnetic induction performance. In contrast, in the tightly wound coil, the distribution of magnetic induction intensity exhibits a distinct characteristic: the magnetic induction intensity on both sides is relatively dense, while the magnetic induction intensity in the central region is relatively low. This distribution characteristic can cause insufficient magnetic induction performance in the central region.

[0020] Further, the double-layer vertical DD coil magnetic coupling mechanism has two pairs of coils that are mutually perpendicular and orthogonal, i.e. the primary side D1 coil only couples with the secondary side D4 coil, and the primary side D2 coil only couples with the secondary side D3 coil, so there is a strong complementary effect between the cross mutual inductance thereof, which compensates for the insufficient anti-deviation ability of the magnetic coupling mechanism in the X direction, so that the double-layer vertical DD coil magnetic coupling mechanism has strong anti-deviation ability in X and Y two directions.

[0021] Further, the magnetic core structure is a key component of the magnetic coupling system, and its influence on the coupling system cannot be ignored. The magnetic core of the magnetic coupler traditionally adopts a full-coverage magnetic core. However, considering the weight and cost, it is not preferred to adopt a full-coverage magnetic core structure for the magnetic core. Therefore, it is necessary to optimize the magnetic core structure. The utility model patent proposes a new cross-shaped magnetic core structure, which greatly reduces the weight, cost and magnetic core usage of the magnetic core.

[0022] The utility model discloses a kind of electric energy transmission systems using anti-deviation magnetic coupling mechanism based on double-layer vertical DD coil, system has adopted double-layer vertical DD coil design, significantly improve the anti-deviation ability, ensure the efficient stable transmission of electric energy under different deviation conditions.Meanwhile, the use of primary LCC-S compensation network and secondary LCC-S compensation network, by accurately adjusting the resonant frequency of system, further optimize the electric energy transmission efficiency, reduce energy loss. Since the system has excellent anti-deviation performance and efficient electric energy transmission capacity, it is suitable for a variety of complex application scenarios, such as mobile device wireless charging, electric vehicle dynamic charging, unmanned aerial vehicle aerial charging and the like. This flexibility enables the system to meet the specific needs of different fields and scenarios. Through integrated control system, the system can monitor and adjust the output of direct-current power supply, the working state of primary full-bridge inverter circuit, the compensation parameter of compensation network and the output of secondary bridge rectifier circuit. This intelligent management not only improves the stability and reliability of the system, but also dynamically optimizes the system performance according to actual needs, achieving more efficient and energy-saving electric energy transmission. The system adopts modular design, and each component is relatively independent, facilitating expansion and maintenance. For example, the number of coil layers can be increased or reduced, and the parameters of the compensation network can be adjusted as needed to adapt to different electric energy transmission needs and scene changes. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiments, it should be understood that the following drawings only show some embodiments of the utility model, therefore should not be regarded as the limitation to the scope, for ordinary skilled person in the art, under the premise of not paying the creative labor, can also obtain other related drawings according to these drawings.

[0024] Figure 1 It is a perspective view of the anti-deviation magnetic coupling mechanism based on double-layer vertical DD coil in the utility model;

[0025] Figure 2 It is a front view of the anti-deviation magnetic coupling mechanism based on double-layer vertical DD coil in the utility model;

[0026] Figure 3This is a schematic diagram of the cross-shaped magnetic core of the anti-offset magnetic coupling mechanism based on a double-layer vertical DD coil in this utility model;

[0027] Figure 4 This is a structural block diagram of the power transmission system using an anti-offset magnetic coupling mechanism based on a double-layer vertical DD coil in this utility model;

[0028] Figure 5 This is a circuit diagram of the power transmission system using an anti-offset magnetic coupling mechanism based on a double-layer vertical DD coil in this utility model.

[0029] Figure 6(a) is a cloud diagram showing the change in mutual inductance of the anti-offset magnetic coupling mechanism based on double-layer vertical DD coil in this utility model when offset occurs in the X and Y directions.

[0030] Figure 6(b) is a two-dimensional fluctuation diagram showing the relationship between the offset distance in the Y direction and the offset distance in the X direction when the anti-offset magnetic coupling mechanism based on the double-layer vertical DD coil in this utility model is offset in the X and Y directions.

[0031] Figure 6(c) is a two-dimensional fluctuation diagram showing the relationship between the equivalent mutual inductance M and the offset distance in the X direction in the cloud diagram of the anti-offset magnetic coupling mechanism based on double-layer vertical DD coil in this utility model when offset occurs in the X and Y directions;

[0032] Figure 6(d) is a two-dimensional fluctuation diagram showing the relationship between the equivalent mutual inductance M and the offset distance in the Y direction in the cloud diagram of the anti-offset magnetic coupling mechanism based on double-layer vertical DD coil in this utility model when offset occurs in the X and Y directions.

[0033] Wherein: 1-Primary side D1 coil; 2-Primary side support isolation plate; 3-Primary side D2 coil; 4-Primary side magnetic core; 5-Secondary side magnetic core; 6-Secondary side D3 coil; 7-Secondary side support isolation plate; 8-Secondary side D4 coil. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0036] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0037] In the description of the embodiments of this utility model, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, they are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the utility model. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0038] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0039] In the description of the embodiments of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0040] The present invention will now be described in further detail with reference to the accompanying drawings:

[0041] See Figure 1 and Figure 2This invention provides an anti-offset magnetic coupling mechanism based on a double-layer vertical DD coil, comprising a transmitter and a receiver arranged opposite each other. The transmitter includes, from top to bottom, a primary side D1 coil 1, a primary side support isolation plate 2, a primary side D2 coil 3, and a primary side magnetic core 4. The receiver includes, from top to bottom, a secondary side D3 coil 5, a secondary side support isolation plate 6, a secondary side D4 coil 7, and a secondary side magnetic core 8. Both the primary side support isolation plate 2 and the secondary side support isolation plate 6 are made of acrylic, glass, ceramic, or polycarbonate. The primary side magnetic core 4 and the secondary side magnetic core 8 are arranged opposite each other. The primary side D1 coil 1 and the primary side D2 coil 3 are wound in the same direction, loosely wound, and perpendicularly orthogonal. The secondary side D3 coil 5 and the secondary side D4 coil 7 are wound in the same direction, loosely wound, and perpendicularly orthogonal. Due to their orthogonal characteristics, the magnetic lines of force of the double-layer coils on the same side are also perpendicular and orthogonal to each other, without interfering with or affecting each other. That is, the primary coil D1 is coupled only to the secondary coil D4, and not to the primary coil D2 or the secondary coil D3; similarly, the primary coil D2 is coupled only to the secondary coil D3, and not to the primary coil D1 or the secondary coil D4. Furthermore, due to the spacing between the turns, the magnetic flux density distribution of loosely wound coils differs, with the concentration point more concentrated in the central region of the coil. This results in a more uniform spatial distribution of magnetic flux density in loosely wound coils, effectively compensating for the weaker magnetic flux density in the central region of tightly wound coils, and providing a new approach to optimizing magnetic flux performance. The double-layer vertical DD coil magnetic coupling mechanism has two pairs of mutually perpendicular and orthogonal coils. That is, the primary side D1 coil is coupled only to the secondary side D4 coil, and the primary side D2 coil is coupled only to the secondary side D3 coil. Therefore, there is a strong complementary effect between their cross inductance. This complementary effect makes up for the lack of anti-offset capability of the magnetic coupling mechanism in the X direction, so that the double-layer vertical DD coil magnetic coupling mechanism has strong anti-offset capability in both the X and Y directions.

[0042] The primary side D1 coil is coupled to the secondary side D4 coil, and the primary side D2 coil is coupled to the secondary side D3 coil. The magnetic field lines of the double-layer coils on the same side are perpendicular to each other and do not interfere with each other. The primary side D1 coil 1, primary side D2 coil 3, secondary side D3 coil 5, and secondary side D4 coil 7 are all composed of two layers of mutually perpendicular DD coils stacked together. The primary side D1 coil 1 and primary side D2 coil 3 are connected in series; the secondary side D3 coil 5 and secondary side D4 coil 7 are connected in series. The length, width, and number of turns of the two DD coils in the primary side D1 coil 1, primary side D2 coil 3, secondary side D3 coil 5, and secondary side D4 coil 7 are all the same. The magnetic coupling mechanism coil has a width of W1, a length of L1, and a number of turns of n. The acrylic plate used has a width of W2 and a length of L2. Both the transmitting and receiving coils are composed of two layers of mutually perpendicular DD coils stacked together, as shown below. Figure 2As shown, the transmitting coils are stacked in the following order from top to bottom: primary side D1 coil 1, primary side support isolation plate 2, primary side D2 coil 3, and primary side magnetic core 4. The primary side D1 coil and primary side D2 coil are each composed of two DD coils connected in series with the same length, width, and number of turns. The receiving coils are stacked in the following order from top to bottom: ferrite magnetic core, secondary side D3 coil, acrylic plate, and secondary side D4 coil. The structure and number of turns of the secondary side D3 coil and secondary side D4 coil are the same as those of the transmitting coil.

[0043] See Figure 3 Both the primary magnetic core 4 and the secondary magnetic core 8 adopt a cross-shaped magnetic core. The primary magnetic core 4 and the secondary magnetic core 8 are made of ferrite, silicon steel sheets, or iron-nickel alloy materials. To save on the amount and weight of magnetic cores used and to solve the problem of insufficient magnetic field strength in the central region of the magnetic coupling mechanism, a cross-shaped magnetic core structure was designed. The length, width, and thickness of the new magnetic core are a1, b1, and c1, respectively. The internal rectangle of the new magnetic core has a length of a2, a width of b2, a distance of g1 from length a1, and a distance of g2 from width a2. The magnetic core structure is a key component of the magnetic coupling system, and its influence on the coupling system cannot be ignored. Traditionally, magnetic couplers use a full-coverage magnetic core. However, considering weight and cost, a full-coverage magnetic core structure is not preferred. Therefore, it is necessary to optimize the magnetic core structure. This utility model patent proposes a novel cross-shaped magnetic core structure, which greatly reduces the weight, cost, and amount of magnetic cores used. Table 1 shows the relevant parameter data of the double-layer vertical DD coil magnetic coupling mechanism;

[0044] Table 1

[0045]

[0046] See Figure 4 This utility model discloses a power transmission system using the aforementioned anti-offset magnetic coupling mechanism based on a double-layer vertical DD coil. It is characterized by comprising a DC power supply, a primary-side full-bridge inverter circuit, a primary-side LCC-S compensation network, and a transmitting end, all connected in sequence. The transmitting end is coupled to a receiving end, which is sequentially connected to a secondary-side LCC-S compensation network, a secondary-side bridge rectifier circuit, and an equivalent load resistor. The primary-side and secondary-side LCC-S compensation networks each include an inductor, a capacitor, and a series resonant capacitor, used to adjust the system's resonant frequency to achieve efficient power transmission. A control system is included to monitor and adjust the output of the DC power supply, the operating state of the primary-side full-bridge inverter circuit, the compensation parameters of the primary-side and secondary-side LCC-S compensation networks, and to manage the output of the secondary-side bridge rectifier circuit, thereby optimizing the overall performance and efficiency of the system.

[0047] See Figure 5 DC power supply DC voltage source Udc The provided primary-side full-bridge inverter circuit consists of four metal-oxide-semiconductor field-effect transistors (MOSFETs) Q1 to Q4. The primary-side LCC-S compensation network is a resonant network composed of L1, R1, C1, C2, and R2. L1, C1, and C2 are the primary-side compensation inductors and capacitors, respectively. R1 and R2 are the internal resistances of inductor L1 and primary-side coil L2, respectively. Both the primary and secondary windings consist of a pair of double-layered, mutually perpendicular DD coils. L2, L3, R2, and R3 are the self-inductance and internal resistance of the primary and secondary windings, respectively. Current I is the output current of the primary-side full-bridge inverter circuit, and currents I1 and I2 are the currents flowing through the primary and secondary windings, respectively. The secondary-side bridge rectifier circuit consists of four rectifier diodes VD1 to VD4. C0 is the output filter capacitor of the rectifier circuit. U IN U IN1 U OUT U OUT1 U0 and U0 are the output voltage of the primary inverter circuit, the voltage at the primary coil terminal, the input voltage of the secondary bridge rectifier circuit, the voltage at the secondary coil terminal, and the load R, respectively. L Voltage at both ends.

[0048] The wireless power transfer system converts DC power U by controlling the drive signal of a high-frequency inverter composed of four metal-oxide-semiconductor field-effect transistors. dc Converted to high-frequency AC voltage U IN Then through another side L CC The resonant compensation network supplies power to the primary-side transmitting coil of the DVDD magnetic coupling mechanism on the primary side. The secondary-side receiving coil receives power from the primary side and then connects to a rectifier circuit composed of four semiconductor diodes through series compensation. Finally, the power is supplied to the equivalent load through output filtering.

[0049] Applying KVL to the LCC-S type resonant compensation network in the figure yields:

[0050] (1)

[0051] In the formula, M eq For the equivalent mutual inductance of the primary and secondary sides of the DVDD magnetic coupling mechanism, R eq The equivalent resistance at the input of the secondary rectifier circuit is R, which is related to the equivalent load resistance R. L The relationship is:

[0052] (2)

[0053] The following condition must be met in the resonant state:

[0054] (3)

[0055] According to equation (3), the specific conditions for resonance can be derived as follows:

[0056] (4)

[0057] Therefore, the currents I, I1, and I2 can be derived as follows:

[0058] (5)

[0059] By performing Fourier decomposition on the output of the primary-side full-bridge inverter circuit, U can be obtained. IN The expressions for I, I1, and I2 are as follows:

[0060] (6)

[0061] (7)

[0062] Therefore, the output power P0 and input power P1 of the wireless power transmission system can be derived as follows:

[0063] (8)

[0064] (9)

[0065] From the formulas, the system conversion efficiency η can be obtained as:

[0066] (10)

[0067] Referring to Figure 6, the equivalent mutual inductance of the double-layer vertical DD coil magnetic coupling mechanism decreases in the x-direction as the offset distance increases, and its equivalent mutual inductance in the y-direction also decreases as the offset distance increases. According to the contour lines in the front view, when the equivalent mutual inductance of the double-layer vertical DD coil magnetic coupling mechanism is offset in the x-direction or y-direction, the anti-offset characteristics in both directions are relatively even. Compared with the traditional DD coil, it has anti-offset characteristics in both directions, thus ensuring the stability of the system operation.

[0068] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A deflection-resistant magnetic coupling mechanism based on a double-layer vertical DD coil, characterized in that, The device includes a transmitter and a receiver arranged opposite each other. The transmitter includes a primary side D1 coil (1), a primary side support isolation plate (2), a primary side D2 coil (3), and a primary side magnetic core (4) arranged from top to bottom. The receiver includes a secondary side D3 coil (5), a secondary side support isolation plate (6), a secondary side D4 coil (7), and a secondary side magnetic core (8) arranged from top to bottom. The primary side magnetic core (4) and the secondary side magnetic core (8) are arranged opposite each other. The primary side D1 coil (1) and the primary side D2 coil (3) are wound in the same direction and are arranged perpendicularly and orthogonally. The secondary side D3 coil (5) and the secondary side D4 coil (7) are wound in the same direction and are arranged perpendicularly and orthogonally. The primary side D1 coil and the secondary side D4 coil are coupled, and the primary side D2 coil and the secondary side D3 coil are coupled. The magnetic lines of the double-layer coils on the same side are perpendicular to each other and do not interfere with each other.

2. The anti-offset magnetic coupling mechanism based on a double-layer vertical DD coil according to claim 1, characterized in that, The primary side D1 coil (1), primary side D2 coil (3), secondary side D3 coil (5) and secondary side D4 coil (7) are all composed of two layers of mutually perpendicular DD coils stacked together.

3. The anti-offset magnetic coupling mechanism based on a double-layer vertical DD coil according to claim 1, characterized in that, The primary side D1 coil (1) and the primary side D2 coil (3) are connected in series; the secondary side D3 coil (5) and the secondary side D4 coil (7) are connected in series.

4. The anti-offset magnetic coupling mechanism based on a double-layer vertical DD coil according to claim 1, characterized in that, The two DD coils in the primary side D1 coil (1), primary side D2 coil (3), secondary side D3 coil (5) and secondary side D4 coil (7) have the same length, width and number of turns.

5. The anti-offset magnetic coupling mechanism based on a double-layer vertical DD coil according to claim 1, characterized in that, Both the primary magnetic core (4) and the secondary magnetic core (8) are cross-shaped magnetic cores.

6. The anti-offset magnetic coupling mechanism based on a double-layer vertical DD coil according to claim 1, characterized in that, The primary magnetic core (4) and secondary magnetic core (8) are made of ferrite, silicon steel sheet or iron-nickel alloy material.

7. The anti-offset magnetic coupling mechanism based on a double-layer vertical DD coil according to claim 1, characterized in that, Both the primary side support isolation plate (2) and the secondary side support isolation plate (6) are made of acrylic, glass, ceramic or polycarbonate materials.

8. A power transmission system using the anti-offset magnetic coupling mechanism based on a double-layer vertical DD coil as described in any one of claims 1-7, characterized in that, It includes a DC power supply, a primary-side full-bridge inverter circuit, a primary-side LCC-S compensation network, and the transmitter connected in sequence; the transmitter and receiver are connected by magnetic coupling, and the receiver is connected in sequence to a secondary-side LCC-S compensation network, a secondary-side bridge rectifier circuit, and an equivalent load resistor.

9. The power transmission system based on the anti-offset magnetic coupling mechanism of a double-layer vertical DD coil according to claim 8, characterized in that, The primary-side LCC-S compensation network and the secondary-side LCC-S compensation network each include an inductor, a capacitor, and a series resonant capacitor, which are used to adjust the resonant frequency of the system to achieve efficient power transmission.

10. The power transmission system based on the anti-offset magnetic coupling mechanism of a double-layer vertical DD coil according to claim 1, characterized in that, It includes a control system for monitoring and adjusting the output of the DC power supply, the operating status of the primary-side full-bridge inverter circuit, the compensation parameters of the primary-side LCC-S compensation network and the secondary-side LCC-S compensation network, and managing the output of the secondary-side bridge rectifier circuit to optimize the overall performance and efficiency of the system.

Images