CN113500924A - Wireless receiving end structure that charges - Google Patents

Abstract

The invention discloses a wireless charging receiving end structure which comprises a chassis, a coil winding, a tiled magnetic core and a shell, wherein the chassis, the coil winding, the tiled magnetic core and the shell are sequentially arranged from bottom to top, and the wireless charging receiving end structure also comprises an annular magnetic core, the inner wall of the annular magnetic core is attached to the peripheral side of the tiled magnetic core, and the annular magnetic core is used for reducing the magnetic resistance between the wireless charging receiving end and the wireless charging transmitting end. Compared with the prior art, the annular magnetic core is additionally arranged on the peripheral side of the tiled magnetic core, so that the coverage area of the magnetic core relative to the coil winding is increased, the magnetic resistance between the transmitting end and the receiving end is reduced, and the transmission capability is improved.

Description

Wireless receiving end structure that charges

Technical Field

The invention belongs to the technical field of wireless charging of electric automobiles, and particularly relates to a wireless charging receiving end structure.

Background

With the rapid development of our country in the field of electric vehicles in recent years, how to realize the safe, convenient and rapid charging of electric vehicles is of great significance. The traditional scheme of charging the electric automobile is that electric energy is directly obtained from a power grid through a charging pile, however, when the electric automobile is charged in a wired mode, a charging socket or a cable usually has an exposed part, electric sparks and electric arcs are easily generated during high-power charging, and great potential safety hazards exist; meanwhile, the traditional wired charging requires manual operation of a user, and the phenomenon of poor contact is easily caused by artificial negligence and hardware abrasion caused by frequent plugging and unplugging of a charging socket, so that personal safety events in a high-power environment are caused.

In order to solve the above problems, a short-distance wireless power transmission technology is generally adopted to realize wireless charging of the electric vehicle. In the wireless charging technology of the electric automobile, a receiving end is usually installed on a chassis of the electric automobile, an induced current is generated through a magnetic field generated by a transmitting end installed on the ground or underground, and the induced current is rectified into direct current to charge a battery of the electric automobile.

Therefore, how to design a wireless charging receiving terminal structure capable of improving transmission efficiency is an urgent technical problem to be solved in the industry.

Disclosure of Invention

The invention provides a wireless charging receiving end structure, aiming at the problem that the energy transmission efficiency of the wireless charging receiving end is not high in the prior art.

The technical scheme includes that the wireless charging receiving end structure comprises a chassis, a coil winding, a tiled magnetic core and a shell which are sequentially arranged from bottom to top, and further comprises an annular magnetic core, wherein the inner wall of the annular magnetic core is attached to the peripheral side of the tiled magnetic core, and the annular magnetic core is used for reducing the magnetic resistance between the wireless charging receiving end and the wireless charging transmitting end.

Further, the tiling magnetic core comprises a plurality of cubic magnetic cores of laminating each other concatenation, every cubic magnetic core does not have the edge adjacent with other cubic magnetic cores to be equipped with the strip magnetic core of laminating with it and covering this limit, and is a plurality of strip magnetic core end to end forms annular magnetic core.

Further, the tiling magnetic core comprises a plurality of cubic magnetic cores of laminating each other concatenation, every cubic magnetic core do not have with other cubic magnetic cores adjacent edge be equipped with cubic magnetic core integrated into one piece's bar protruding, the protruding laminating each other of bar on two arbitrary adjacent cubic magnetic cores in the tiling magnetic core outside makes a plurality of protruding end to end connection of bar forms annular magnetic core.

Further, the annular magnetic core extends downward on the peripheral side of the tiled magnetic core, so that the magnetic flux is led out downward along the extending part of the annular magnetic core.

Further, still including locating first apron magnetic core on the magnetic core that tiles, be equipped with the breach that is used for walking the line on the magnetic core that tiles, first apron magnetic core is located breach department on the magnetic core that tiles, and cover the breach makes the tiling magnetic core of breach both sides pass through first apron magnetic core intercommunication.

Further, still including locating second apron magnetic core on the magnetic core that tiles, arbitrary two is located to second apron magnetic core the interconnect department of cubic magnetic core to cover the clearance of two adjacent cubic magnetic core interconnect departments.

Furthermore, a wiring groove for accommodating the coil winding is arranged on the chassis, and the shape of the wiring groove is matched with that of the coil winding, so that each coil winding is arranged in the wiring groove.

Further, the shell orientation the one side of tiling magnetic core is equipped with at least one wavy arch, the clearance setting between two adjacent cubic magnetic cores is avoided to wavy arch.

The heat-conducting glue is connected with the shell and the flatly-laid magnetic core and used for dissipating heat to the outside through the shell, and the heat-conducting glue is sticky.

Furthermore, at least one through hole is formed in the tiled magnetic core, the chassis and the shell are provided with mounting structures matched with each other, and the chassis and the shell are fixed through screws through the through holes.

Compared with the prior art, the invention has at least the following beneficial effects:

1. through setting up the annular magnetic core that the round surrounds tiling magnetic core week side, increased the coverage area of magnetic core for coil winding, make the magnetic resistance between transmitting terminal and the receiving terminal reduce, improved transmission ability.

2. Be provided with first apron magnetic core and second apron magnetic core on the magnetic core that tiles, reduced the magnetic leakage of tiling magnetic core, reduced magnetic line of force cutting coil and the loss that produces the vortex and arouse on the shell.

3. Annular magnetic core can with tiling magnetic core integrated into one piece, through being located the protruding end to end connection of bar on the tiling magnetic core and forming annular magnetic core, reduces the kind of magnetic core, the production and processing of being convenient for.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a schematic structural diagram of a wireless charging receiving terminal according to the present invention;

FIG. 2 is a schematic view of the arrangement of a first cover plate magnetic core and a second cover plate magnetic core in accordance with the present invention;

FIG. 3 is a schematic diagram of one design of a block core of the present invention;

FIG. 4 is a schematic diagram of another design of the block core of the present invention;

FIG. 5 is a schematic view of magnetic flux when the ring core is not provided;

FIG. 6 is a schematic view of magnetic flux after an annular core is provided;

fig. 7 is a schematic view of magnetic flux after the first cover plate magnetic core is arranged.

Wherein, 1 is the chassis, 11 is the trough, 2 is coil winding, 3 is tiling magnetic core, 31 is cubic magnetic core, 32 is the bar magnetic core, 33 first apron magnetic core, 34 are the bar arch, 35 are second apron magnetic core, 4 are the shell.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Thus, a feature indicated in this specification will serve to explain one of the features of one embodiment of the invention, and does not imply that every embodiment of the invention must have the stated feature. Further, it should be noted that this specification describes many features. Although some features may be combined to show a possible system design, these features may also be used in other combinations not explicitly described. Thus, the combinations illustrated are not intended to be limiting unless otherwise specified.

The principles and construction of the present invention will be described in detail below with reference to the drawings and examples.

In the prior art, a receiving end is usually installed on a chassis of an electric vehicle, an induced current is generated by a magnetic field generated by a transmitting end installed on the ground or underground, and the induced current is rectified into direct current to charge a battery of the electric vehicle. The idea of the invention is that a magnetic field shaping component is arranged at a tiled magnetic core in a receiving end, the magnetic field shaping component is an annular magnetic core with the inner wall attached to the peripheral side of the tiled magnetic core, and the arrangement of the annular magnetic core is changed in phase to increase the coverage area of the tiled magnetic core relative to a coil winding, so that the magnetic resistance between a transmitting end and an output end is reduced, and the transmission efficiency is improved.

Specifically, referring to fig. 1, the wireless charging receiving end structure provided by the present invention includes: chassis 1, coil winding 2, tiling magnetic core 3, shell 4. The chassis 1 is arranged at the bottommost part of the wireless charging receiving end structure, is used for fixing the coil winding 2 and playing a supporting role, and is generally made of plastic materials in order to ensure energy transmission of a magnetic field; the coil winding 2 is arranged on the chassis 1, plays a role of fixing through a wiring groove 11 on the chassis 1, is formed by winding at least one litz wire, can act with a magnetic field to generate alternating current, and can be used for charging a high-voltage battery of an automobile after being rectified; the tiled magnetic core 3 is arranged above the coil winding 2 and covers the coil winding 2, and is used for reducing the magnetic resistance between the receiving end and the transmitting end, enabling the magnetic flux generated by the transmitting end to be more concentrated on a magnetic flux coupling path with the receiving end, increasing the coupling coefficient and improving the transmission capability; the shell 4 is arranged at the topmost end of the device, is installed together with the chassis 1 to form a shell of a wireless charging receiving end, places the coil winding 2 and the flat magnetic core 3 in the shell, and is generally made of metal materials such as aluminum materials, and because the distance between the transmitting end and the receiving end is generally far, the coupling path is long, and large magnetic leakage is generated generally, and through the arrangement of the metal shell 4, the magnetic leakage can be absorbed, and the influence of the magnetic leakage on a working circuit above the receiving end is avoided.

Further, be provided with round magnetic field shaping part in the week side of tiling magnetic core, surround the week side of tiling magnetic core 3 through magnetic field shaping part, the area of tiling magnetic core 3 has been increased to the change looks to increase tiling magnetic core 3 for the coverage rate of coil winding 2, reduce the magnetic resistance between transmitting terminal and the receiving terminal, improve transmission efficiency. Wherein, magnetic field plastic part is the cyclic annular magnetic core that the week side of inner wall and tiling magnetic core 3 was laminated each other, and the week side that will tile magnetic core 3 through cyclic annular magnetic core surrounds, increases the area of tiling magnetic core 3 to improve transmission efficiency.

In an embodiment of the present invention, the tiled magnetic core 3 is a square magnetic core, and is formed by splicing a plurality of block-shaped magnetic cores 31, and strip-shaped magnetic cores 32 are disposed on the sides of each block-shaped magnetic core 31 that are not adjacent to other block-shaped magnetic cores 31, as is apparent from fig. 1, the sides of the block-shaped magnetic cores 31 that are not adjacent to other magnetic cores are four sides of the tiled magnetic core 3, and strip-shaped magnetic cores 32 are disposed on the sides of each block-shaped magnetic core 31 that are not adjacent to other block-shaped magnetic cores 31, and after the strip-shaped magnetic cores 32 and the strip-shaped magnetic cores 32 adjacent thereto are connected end to end, a ring-shaped magnetic core is formed, so as to improve the transmission efficiency, and the magnetic flux leakage can be reduced to a certain extent by surrounding the tiled magnetic core 3 in the middle.

Referring to fig. 3 and 4, in another embodiment of the present invention, a strip-shaped protrusion 34 is provided on a portion of the block-shaped magnetic core 31 that is not connected to another block-shaped magnetic core 31, and the strip-shaped protrusion 34 and the block-shaped magnetic core 31 are integrally formed, so that the shape of the block-shaped magnetic core 31 can be changed only when the block-shaped magnetic core 31 is designed, and the product can be manufactured without additionally providing a corresponding strip-shaped magnetic core 32. Compare with the scheme of design bar magnetic core 32, the design of tiling magnetic core 3 in this embodiment is the same with it, all forms through a plurality of cubic magnetic cores 31 mutual concatenations, and what be different with it changes bar magnetic core 32 into in this embodiment and cubic magnetic core 31 integrated into one piece's bar protruding 34, makes it can be when improving transmission efficiency, the production of the product of being convenient for.

Preferably, the annular core 31 extends downward on the peripheral side of the flat core 3, and the magnetic flux is led out downward along the extending portion of the annular core 31, thereby reducing the loss of the magnetic flux.

Specifically, please refer to fig. 5 and 6, fig. 5 is a schematic diagram of the case when the annular magnetic core is not disposed on the peripheral side of the tiled magnetic core 3, it can be seen from the diagram that when the annular magnetic core of the magnetic field shaping component is not added, the magnetic flux is relatively dispersed when leaving, and not less magnetic flux leaves the tiled magnetic core 3 upward, and this part of magnetic flux can generate eddy current loss on the housing 4, which reduces the efficiency and makes the housing 4 generate additional heat, fig. 6 is a schematic diagram of the magnetic flux after adding the annular magnetic core, and most of the magnetic flux is guided downward by the annular magnetic core, and more magnetic flux participates in the coupling, and the coupling coefficient is improved, and the magnetic flux above which generates eddy current loss is reduced, and the benefits brought by the reduction of the magnetic flux leakage include: coupling coefficient of the receiving end and the transmitting end is improved, electromagnetic radiation intensity is weakened, eddy current loss of metal parts in a metal shell and an automobile is reduced, and thermal risk is reduced.

Further, referring to fig. 2, a gap for routing is provided on the tiled magnetic core 3, and since the alternating current generated by the coil winding 2 needs to be transmitted to the circuit above the receiving end, which needs to be connected by routing, the gap is unavoidable. However, due to the gap, the magnetic core is not coherent, and a part of the magnetic flux enters the air to become leakage flux, which cuts the coil and generates eddy current on the housing 4, thereby generating extra loss. In this embodiment, be provided with first lid magnetic core 33 in the breach department of tiling magnetic core 3, cover the breach on the magnetic core 3 that will tile through first apron magnetic core 33 to the tiling magnetic core 3 intercommunication that will be located the breach both sides, through the setting of first apron magnetic core 33, can maintain magnetic flux inside tiling magnetic core 3, and then reduce the production and the influence of magnetic leakage.

Referring to fig. 7, which is a schematic view of the magnetic flux after the first cover plate magnetic core 33 is disposed in the present invention, it can be seen from fig. 7 that the magnetic flux flowing through the gap can flow into the tiled magnetic core 3 on the other side of the gap through the first cover plate magnetic core 33, so that the problem of magnetic flux leakage caused by the inflow of air into the magnetic flux is avoided.

Preferably, the magnetic core further comprises a second cover plate magnetic core 35 arranged on the tiled magnetic core 3, the second cover plate magnetic core 35 is arranged at the interconnection position of the block-shaped magnetic cores 31 on the tiled magnetic core 3, because the tiled magnetic core 3 is formed by splicing a plurality of block-shaped magnetic cores 31, gaps are easily generated at the spliced position of the two block-shaped magnetic cores 31 due to the splicing process or the shape design of the block-shaped magnetic cores 31, which is the same as the gap on the tiled magnetic core 31, will cause the magnetic cores here to be disconnected, thereby generating extra loss, and in order to avoid the above problems, the second cover plate magnetic core 35 is arranged at the interconnection position of any two block-shaped magnetic cores 31, the second cover plate magnetic core 35 is strip-shaped, can block the gap generated between the two block-shaped magnetic cores 31, through the setting of second apron magnetic core 35, can further avoid the production of magnetic leakage, improve energy transmission's efficiency to a certain extent.

Further, be equipped with the trough 11 that holds coil winding 2 and place on chassis 1, it is used for better installation coil winding 2, in order to guarantee coil winding 2's stability, the shape of trough 11 and coil winding 2's shape phase-match, coil winding 2 is formed by at least one litz wire winding, wholly be the vortex shape, the shape of trough 11 also is the vortex shape, make every round coil winding 2 homoenergetic arrange in trough 11, play good fixed effect, avoid coil winding 2 to take place the skew and influence induced-current's production.

Further, it has heat-conducting glue to fill between shell 4 and tiling magnetic core 3, because the wireless receiving terminal that charges can produce the heat when carrying out the work, if the device is burnt out easily to the heat height, so it has heat-conducting glue to fill between tiling magnetic core 3 and shell 4, because shell 4 is the wireless partly of receiving terminal casing that charges, its and outside interconnect for heat-conducting glue can distribute away the heat through shell 4, avoids the damage of device.

When the wireless charging receiving end works, due to the fact that expansion with heat and contraction with cold are obvious, connection of the heat-conducting glue is prone to be unstable, connection between the heat-conducting glue and the tiled magnetic core is loosened, and accordingly the heat dissipation effect is poor.

Furthermore, one surface of the shell 4 facing the tiled magnetic core 3 is provided with at least one wavy bulge, the wavy bulge is connected with the heat-conducting glue, so that the connection between the heat-conducting glue and the shell 4 can be further enhanced, and meanwhile, the contact area between the shell 4 and the heat-conducting glue can be increased by the wavy bulge, so that the heat dissipation effect is improved.

Further, be provided with at least one through-hole on tiling magnetic core 3, be equipped with the mounting structure who matches each other on shell 4 and the chassis 1, make it realize the fix with screw through this through-hole, can increase the holistic structural strength of device through the fix with screw. Because chassis 1 generally is the plastics material, and its intensity is not high, passes the through-hole through the screw and makes shell 4 and chassis 1 fixed, can be with tiling magnetic core 3 and coil winding 2 stable fixing inside the device, increased holistic intensity, when needing to explain, coil winding 2 forms for litz wire winding, and certain space generally leaves among them, so need not punch the setting to coil winding 2 again.

Compared with the prior art, the invention improves the coupling coefficient between the transmitting end and the receiving end through the arrangement of the magnetic field shaping component, namely the annular magnetic core, thereby improving the efficiency of energy transmission. Meanwhile, the heat-conducting glue and the wavy bulges on the shell are arranged, so that the heat-radiating effect is improved, and the damage caused by overheating of the device due to falling of the heat-conducting glue is avoided.

The above examples are intended only to illustrate specific embodiments of the present invention. It should be noted that, for a person skilled in the art, several modifications and variations can be made without departing from the inventive concept, and these modifications and variations shall fall within the protective scope of the present invention.

Claims (10)

1. The utility model provides a wireless receiving terminal structure that charges, includes chassis, coil winding, tiling magnetic core, the shell that from supreme setting gradually down, its characterized in that still includes the inner wall with the cyclic annular magnetic core of laminating each other in week side of tiling magnetic core, cyclic annular magnetic core is used for reducing the wireless receiving terminal that charges and the wireless magnetic resistance that charges between the transmitting terminal.

2. The wireless charging receiving terminal structure according to claim 1, wherein the tiled magnetic core is formed by splicing a plurality of block-shaped magnetic cores attached to each other, a strip-shaped magnetic core attached to and covering an edge of each block-shaped magnetic core, which is not adjacent to other block-shaped magnetic cores, is provided on the edge, and the plurality of strip-shaped magnetic cores are connected end to form the ring-shaped magnetic core.

3. The wireless charging receiving end structure according to claim 1, wherein the tiled magnetic core is formed by mutually splicing a plurality of block-shaped magnetic cores which are mutually attached, strip-shaped protrusions which are integrally formed with the block-shaped magnetic cores are arranged on the edges of each block-shaped magnetic core which are not adjacent to other block-shaped magnetic cores, and the strip-shaped protrusions on any two adjacent block-shaped magnetic cores outside the tiled magnetic core are mutually attached to form the annular magnetic core by connecting the plurality of strip-shaped protrusions end to end.

4. The wireless charging receiving terminal structure according to claim 1, wherein the annular core extends downward on a peripheral side of the tiled core, so that magnetic flux is led out downward along an extended portion of the annular core.

5. The wireless charging receiving end structure of claim 1, further comprising a first cover plate magnetic core disposed on the tiled magnetic core, wherein a notch for routing is disposed on the tiled magnetic core, and the first cover plate magnetic core is disposed at the notch on the tiled magnetic core and covers the notch to communicate the tiled magnetic cores on two sides of the notch through the first cover plate magnetic core.

6. The wireless charging receiving end structure according to claim 2 or 3, further comprising a second cover magnetic core disposed on the tiled magnetic core, wherein the second cover magnetic core is disposed at an interconnection of any two of the block-shaped magnetic cores and covers a gap at the interconnection of two adjacent block-shaped magnetic cores.

7. The wireless charging receiving terminal structure according to claim 1, wherein a wiring groove for accommodating the coil winding is formed on the chassis, and the shape of the wiring groove is matched with that of the coil winding, so that each coil winding is arranged in the wiring groove.

8. The wireless charging receiving terminal structure of claim 6, wherein a surface of the housing facing the tiled magnetic cores is provided with at least one wavy protrusion, and the wavy protrusion is disposed to avoid a gap between two adjacent block-shaped magnetic cores.

9. The wireless charging receiving terminal structure of claim 7, further comprising a thermal conductive adhesive disposed between the planar magnetic core and the housing, wherein the thermal conductive adhesive connects the housing and the planar magnetic core for dissipating heat to the outside through the housing, and the thermal conductive adhesive is a sticky thermal conductive adhesive.

10. The wireless charging receiving end structure of claim 1, wherein at least one through hole is formed in the tiled magnetic core, mounting structures matched with each other are formed on the chassis and the housing, and the chassis and the housing are fixed by screws through the through holes.

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