A wireless power transmission coupling mechanism with compatibility

Abstract

The present invention relates to the field of wireless power transmission, and specifically to a compatible wireless power transmission coupling mechanism, wherein the coupling mechanism body comprises: a transmitting end and a receiving end; the transmitting end comprises a first coil, a second coil, a third coil, a fourth coil and a transmitting end magnetic core with a convertible connection mode, and the receiving end comprises a receiving coil and a receiving end magnetic core; the transmitting end magnetic core comprises a first magnetic core block, a second magnetic core block, a third magnetic core block and a fourth magnetic core block; the receiving end comprises a receiving end planar spiral coil, a receiving end space spiral coil, a receiving end flat solenoid coil and a receiving end magnetic core. The present invention optimizes the transmitting end coil and the transmitting end coil connection mode to make it compatible with different types of receiving coils, thereby improving the interoperability of the wireless power transmission coupling mechanism, and further having important significance for promoting the large-scale application process of my country's wireless charging industry.

Description

Technical Field

[0001] The invention relates to the field of wireless power transmission, and in particular to a wireless power transmission coupling mechanism with compatibility. Background Art

[0002] Compared with traditional charging methods, wireless power transmission technology is safe and flexible, and has broad development potential in electric vehicles, consumer electronics, smart homes, and medical treatment. Magnetic coupling resonant wireless power transmission technology uses the transmitter of wireless power transmission to convert high-frequency alternating electric fields into high-frequency alternating magnetic fields, and transfers energy to the load through coupling at the receiving end. As an energy transfer station, the coupling mechanism plays a vital role in the wireless power transmission system. How to be compatible with different coil types has become one of the design requirements of magnetic couplers.

[0003] In addition, the commonly used coupling mechanisms for wireless power transmission systems include flat solenoid type, planar spiral type, and space spiral coils. The advantages of the flat solenoid type coupling mechanism are compact structure, light weight, and strong lateral anti-deviability, while the planar spiral type and space spiral type coupling mechanisms have the advantage of low leakage magnetic field. However, the flat solenoid type coil, the planar spiral type coil, and the space spiral type coil have different requirements for the direction of the coupling magnetic field when used as receiving coils. For the flat solenoid coil, it is necessary to couple the magnetic field parallel to the plane of the transmitting end, while the planar spiral coil and the space spiral coil need to couple the magnetic field perpendicular to the plane of the transmitting end. The traditional wireless power transmission transmitting end can only generate a magnetic field in one direction, and cannot take into account the flat solenoid type receiving end, the planar spiral receiving end, and the space spiral receiving end. Summary of the invention

[0004] In order to solve the deficiencies mentioned in the above background technology, the object of the present invention is to provide a compatible wireless power transmission coupling mechanism.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A compatible wireless power transmission coupling mechanism, the coupling mechanism comprising a transmitting end and a receiving end, the transmitting end and the receiving end are electrically connected, the transmitting end comprises a transmitting coil and a transmitting end magnetic core, the transmitting coil is wound on the transmitting end magnetic core;

[0007] The receiving end includes a receiving end planar spiral coil, a receiving end space spiral coil, a receiving end flat solenoid coil and a receiving end magnetic core. The receiving end planar spiral coil, the receiving end space spiral coil and the receiving end flat solenoid coil are all arranged on the magnetic field receiving side, and the receiving end flat solenoid coil is wound on the receiving end magnetic core.

[0008] Furthermore, the transmitting coil includes a first coil, a second coil, a third coil, and a fourth coil; the transmitting end magnetic core includes a first magnetic core block, a second magnetic core block, a third magnetic core block, and a fourth magnetic core block; the first coil is wound on the first magnetic core block to form a first section of a solenoid type coil transmitting end, the second coil is wound on the second magnetic core block to form a second section of a solenoid type transmitting end, the third coil is wound on the third magnetic core block to form a third section of a solenoid type transmitting end, and the fourth coil is wound on the fourth magnetic core block to form a fourth section of a solenoid type transmitting end.

[0009] Furthermore, the first coil, the second coil, the third coil, and the fourth coil have the same size and are all rectangular solenoid coils; the first coil, the second coil, the third coil, and the fourth coil are wound with the same Litz wire; the first coil, the second coil, the third coil, and the fourth coil are arranged in a counterclockwise direction, with an angle of 90 degrees between adjacent coils and are closely arranged.

[0010] Furthermore, the first core block, the second core block, the third core block, and the fourth core block have the same height, shape, and size; the first core block, the second core block, the third core block, and the fourth core block are rectangular ferrite bars with a length of 0.2 to 0.4L, where L is the total length of the transmitting end.

[0011] Beneficial effects of the present invention:

[0012] The present invention divides the transmitting coil into four parts and adds a magnetic core in the middle of the coil, and connects them in different ways to generate a magnetic field perpendicular to the transmitting end or a magnetic field parallel to the transmitting end. It is suitable for various types of receiving end coils and improves the compatibility of the wireless power transmission system. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings required for use in the embodiments or the prior art description are briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0014] Figure 1 It is a schematic diagram of the transmitting end of the coupling mechanism of the present invention;

[0015] Figure 2 It is a schematic diagram of the transmitting end and the flat solenoid type receiving end of the coupling mechanism of the present invention;

[0016] Figure 3 It is a schematic diagram of the transmitting end of the coupling mechanism and the receiving end of the planar spiral coil of the present invention;

[0017] Figure 4 It is a schematic diagram of the transmitting end of the coupling mechanism and the receiving end of the space spiral coil of the present invention;

[0018] Figure 5 It is a schematic diagram of the connection of the transmitting end of the planar spiral type and the spatial spiral type receiving end applicable to the embodiment of the present invention;

[0019] Figure 6 It is a schematic diagram of the connection of the transmitting end of the flat solenoid type receiving end applicable to the embodiment of the present invention;

[0020] Figure 7 is a schematic diagram of the distribution of spatial magnetic field lines suitable for a planar helical receiving coil generated by an embodiment of the present invention;

[0021] Figure 8 is a schematic diagram of the distribution of spatial magnetic field lines suitable for a spatial spiral receiving coil generated by an embodiment of the present invention;

[0022] Fig. 9 is a schematic diagram of the distribution of spatial magnetic field lines suitable for a flat solenoid type receiving coil generated by an embodiment of the present invention;

[0023] The reference numerals are described as follows:

[0024] 1a, the first coil; 1b, the second coil; 1c, the third coil; 1d, the fourth coil; 2a, the first magnetic core block of the transmitting end; 2b, the second magnetic core block of the transmitting end; 2c, the third magnetic core block of the transmitting end; 2d, the fourth magnetic core block of the transmitting end; 5, the planar spiral coil of the receiving end; 6, the spatial spiral coil of the receiving end; 7, the flat solenoid coil of the receiving end; 71, the magnetic core of the receiving end. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] A wireless power transmission coupling mechanism having compatibility, such as Figure 1-4 As shown, the coupling mechanism includes a transmitting end and a receiving end, and the transmitting end and the receiving end are electrically connected.

[0027] The transmitting end includes a transmitting coil and a transmitting end magnetic core, and the transmitting coil is wound on the transmitting end magnetic core. The transmitting coil includes a first coil 1a, a second coil 1b, a third coil 1c, and a fourth coil 1d; the transmitting end magnetic core includes a first magnetic core block 2a, a second magnetic core block 2b, a third magnetic core block 2c, and a fourth magnetic core block 2d; the first coil 1a is wound on the first magnetic core block 2a to form a first section of a solenoid-type coil transmitting end, the second coil 1b is wound on the second magnetic core block 2b to form a second section of a solenoid-type transmitting end, the third coil 1c is wound on the third magnetic core block 2c to form a third section of a solenoid-type transmitting end, and the fourth coil 1d is wound on the fourth magnetic core block 2d to form a fourth section of a solenoid-type transmitting end.

[0028] By changing the connection method between the transmitting coils, it can be suitable for different types of receiving coils. At the same time, connecting the four transmitting ends in series according to the direction of the inward exciting magnetic field is suitable for planar spiral or spatial spiral receiving coils; connecting the two transmitting ends 180 degrees apart in series according to the ports that excite the magnetic field in the same direction is suitable for solenoid receiving coils.

[0029] Among them, the first coil 1a, the second coil 1b, the third coil 1c, and the fourth coil 1d have the same size and are all rectangular solenoid coils; the first coil 1a, the second coil 1b, the third coil 1c, and the fourth coil 1d are wound by the same Litz wire; the first coil 1a, the second coil 1b, the third coil 1c, and the fourth coil 1d are arranged in a counterclockwise direction, and the angle between adjacent coils is 90 degrees and they are closely arranged.

[0030] Among them, the first core block 2a, the second core block 2b, the third core block 2c, and the fourth core block 2d have the same height, shape, and size; the first core block 2a, the second core block 2b, the third core block 2c, and the fourth core block 2d are rectangular ferrite bars with a length of 0.2 to 0.4L, where L is the total length of the transmitter. The length of the core block is a non-restrictive and preferred choice, and the length of the core block can be designed according to actual conditions. The shape of the transmitter core includes a rectangular parallelepiped, and the shape is not strictly limited.

[0031] The receiving end includes a receiving end planar spiral coil 5, a receiving end space spiral coil 6, a receiving end flat solenoid coil 7 and a receiving end magnetic core 71. The receiving end planar spiral coil 5, the receiving end space spiral coil 6 and the receiving end flat solenoid coil 7 are all arranged on the magnetic field receiving side, and the receiving end flat solenoid coil 7 is wound on the receiving end magnetic core 71.

[0032] Based on the above analysis, in order to generate a magnetic field perpendicular to the transmitting end plane and pointing upward to match the plane spiral or space spiral receiving coil, such as Figure 5As shown, the four transmitting coils are connected in the manner of A→B`, B→C`, and C→D` according to the current flowing into the A` port. Figure 7 and Figure 8 The figure shows the distribution diagram of magnetic lines of force generated after the transmitting coil is connected according to the above connection method. It can be seen from the figure that a vertical magnetic field that can couple with the planar spiral coil or the spatial spiral coil is generated above the transmitting coil.

[0033] For the flat solenoid receiving coil, a magnetic field parallel to the transmitting end is required to couple with it, such as Figure 6 As shown, if the transmitting coil is connected from A` to C`, B and B`, D and D` are connected, a magnetic field with parallel magnetic flux will be generated above the transmitting end, as shown in Fig. 9 shown.

[0034] Compared with the existing technology, by dividing the transmitting coil into four parts and adding a magnetic core in the middle of the coil, and connecting them in different ways, a magnetic field perpendicular to the transmitting end or a magnetic field parallel to the transmitting end can be generated. It is suitable for a variety of receiving end coil types and improves the compatibility of the wireless power transmission system.

[0035] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A compatible wireless power transmission coupling mechanism, characterized in that: The coupling mechanism comprises a transmitting end and a receiving end, the transmitting end and the receiving end are electrically connected, the transmitting end comprises a transmitting coil and a transmitting end magnetic core, and the transmitting coil is wound on the transmitting end magnetic core; The receiving end comprises a receiving end planar spiral coil (5), a receiving end space spiral coil (6), a receiving end flat solenoid coil (7) and a receiving end magnetic core (71); the receiving end planar spiral coil (5), the receiving end space spiral coil (6) and the receiving end flat solenoid coil (7) are all arranged on the magnetic field receiving side, and the receiving end flat solenoid coil (7) is wound on the receiving end magnetic core (71); The transmitting coil comprises a first coil (1a), a second coil (1b), a third coil (1c), and a fourth coil (1d); the transmitting end magnetic core comprises a first magnetic core block (2a), a second magnetic core block (2b), a third magnetic core block (2c), and a fourth magnetic core block (2d); the first coil (1a) is wound on the first magnetic core block (2a) to form a first section of a solenoid-type coil transmitting end, the second coil (1b) is wound on the second magnetic core block (2b) to form a second section of a solenoid-type transmitting end, the third coil (1c) is wound on the third magnetic core block (2c) to form a third section of a solenoid-type transmitting end, and the fourth coil (1d) is wound on the fourth magnetic core block (2d) to form a fourth section of a solenoid-type transmitting end; The first coil (1a), the second coil (1b), the third coil (1c), and the fourth coil (1d) have the same size and are all rectangular solenoid-type coils; the first coil (1a), the second coil (1b), the third coil (1c), and the fourth coil (1d) are wound with the same Litz wire; the first coil (1a), the second coil (1b), the third coil (1c), and the fourth coil (1d) are arranged in a counterclockwise direction, with an angle of 90 degrees between adjacent coils and they are closely arranged.

2. A compatible wireless power transmission coupling mechanism according to claim 1, characterized in that: The first magnetic core block (2a), the second magnetic core block (2b), the third magnetic core block (2c), and the fourth magnetic core block (2d) have the same height, shape, and size; the first magnetic core block (2a), the second magnetic core block (2b), the third magnetic core block (2c), and the fourth magnetic core block (2d) are rectangular ferrite bars with a length of 0.2 to 0.4L, wherein L is the total length of the transmitting end.

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