CN110571033A - Wireless charging coil and wireless charging device - Google Patents

Abstract

the invention discloses a wireless charging coil and a wireless charging device, wherein the wireless charging coil comprises: a coil assembly wound from litz wire; magnetic sheet group, magnetic sheet group includes first magnetic sheet layer and second magnetic sheet layer at least, first magnetic sheet layer set up in on the coil assembly, just first magnetic sheet layer is by a plurality of first magnetic cores concatenation, second magnetic sheet layer set up in first magnetic sheet layer deviates from one side of coil assembly, second magnetic sheet layer is used for shielding in the first magnetic sheet layer the gap of concatenation between the first magnetic core flows through in the first magnetic sheet layer the route of leaking of the magnetic line of force of concatenation gap between the first magnetic core slows down the magnetic line of force and leaks. According to the technical scheme, the leakage path of the magnetic force lines flowing through the splicing gaps among the first magnetic cores in the first magnetic plate layer is prolonged, the leakage of the magnetic force lines is slowed down, the magnetic field loss is reduced, and the transmission efficiency is improved.

Description

Wireless charging coil and wireless charging device

technical field

The invention relates to the field of wireless charging, in particular to a wireless charging coil and a wireless charging device.

Background technique

Wireless charging generally adopts electromagnetic induction technology. The magnetic core is a key component of energy transfer, which can enhance magnetic field coupling, prevent the leakage of magnetic force lines, reduce electromagnetic interference, and effectively avoid energy loss in wireless transmission. Equipment power (according to the IEC national standard and other automotive wireless charging involves 3.3kW/7kW/11kW/20kW/30kW and other higher power and different air gap levels), the air gap is different, and the size of the coil group is different, so that the overall magnetic plate used The sizes are also different. In order to make the magnetic core suitable for magnetic boards of various sizes, each magnetic board is spliced by multiple single-layer magnetic cores.

However, because the size of the magnetic core is too large, it will cause deformation, cracks and other undesirable phenomena, and the splicing gap of the magnetic core will cause a large leakage loss of the magnetic force line of the magnetic plate and serious energy loss.

Contents of the invention

The main purpose of the present invention is to propose a wireless charging coil, which aims to prolong the leakage path of the magnetic force lines flowing through the splicing gap between the first magnetic cores in the first magnetic plate layer, slow down the magnetic force line leakage, and reduce the magnetic field losses and improve transmission efficiency.

In order to achieve the above purpose, the present invention proposes a wireless charging coil, the wireless charging coil includes:

a coil group wound from Litz wire;

A magnetic plate group, the magnetic plate group at least includes a first magnetic plate layer and a second magnetic plate layer, the first magnetic plate layer is arranged on the coil group, and the first magnetic plate layer is composed of a plurality of second magnetic plate layers A magnetic core is spliced, the second magnetic plate layer is arranged on the side of the first magnetic plate layer away from the coil group, and the second magnetic plate layer is used to shield the first magnetic plate layer The spliced gap between the first magnetic cores is used to prolong the leakage path of the magnetic force lines flowing through the spliced gaps between the first magnetic cores in the first magnetic plate layer, so as to slow down the leakage of the magnetic force lines.

Optionally, the second magnetic plate layer is spliced by a plurality of second magnetic cores, and the plurality of first magnetic cores and the plurality of second magnetic cores are arranged in a staggered manner, so that the second magnetic plate The spliced magnetic plate shields the spliced gap between the magnetic cores in the first magnetic plate layer.

Optionally, the coil assembly includes an output end and an input end, the input end is provided with a first lead wire, the output end is provided with a second lead wire, and the surface of the magnetic plate assembly facing the coil assembly is concavely formed There is a wire slot, and the first wire passes through the wire slot and extends to the outside of the magnetic plate group.

Optionally, the wireless charging coil further includes a casing, and the casing is recessed with an accommodating groove, the coil group and the magnetic plate group are placed in the accommodating groove, and the coil group is away from the One side of the magnetic plate group is close to the bottom of the accommodating groove.

Optionally, the joints spliced between the plurality of first magnetic cores are extended paths of magnetic force lines, wherein the joints may be chamfered surfaces, arcuate surfaces, regular joints and/or irregular joints.

Optionally, the area of the side of the first magnetic plate layer close to the coil set is adapted to the coverage area of the Litz wire in the coil set.

The present invention also proposes a wireless charging device, the wireless charging device includes the above-mentioned wireless charging coil, and the wireless charging coil includes a transmitting end or a receiving end.

The technical scheme of the present invention adds a second magnetic field layer on the first magnetic plate layer, and the second magnetic field layer is used to shield the splicing gap between the first magnetic cores in the first magnetic plate layer, so that the magnetic field generated by the coil group When the first magnetic plate layer forms a loop of magnetic force lines, when the magnetic force lines leak from the gaps spliced between the first magnetic cores, the second magnetic plate layer can effectively shield the magnetic force lines leaked from the first magnetic plate layer, so that the magnetic force lines It needs to be leaked from the gap of the second magnetic field layer, so as to prolong the leakage path of the magnetic field lines flowing through the splicing gap between the first magnetic cores in the first magnetic plate layer, slow down the leakage of the magnetic field lines, reduce the magnetic field loss and improve the transmission efficiency.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to the structures shown in these drawings without creative effort.

Fig. 1 is a structural schematic diagram of a section of a wireless charging coil of the present invention;

Fig. 2 is a partial enlarged view of place A in Fig. 1;

Fig. 3 is a schematic diagram of the magnetic field lines of the wireless charging coil of the present invention;

Fig. 4 is a schematic diagram of the internal structure of the wireless charging coil of the present invention.

Explanation of reference numbers:

label name label name 11 wireless charging coil 13 coil group 12 Disk group 131 Magnetic line of force 121 first magnetic slab 132 first lead 122 second magnetic slab 133 second lead 14 shell

The realization of the purpose of the present invention, functional characteristics and advantages will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

It should be noted that if there is a directional indication (such as up, down, left, right, front, back...) in the embodiment of the present invention, the directional indication is only used to explain the position in a certain posture (as shown in the accompanying drawing). If the specific posture changes, the directional indication will also change accordingly.

In addition, if there are descriptions involving "first", "second" and so on in the embodiments of the present invention, the descriptions of "first", "second" and so on are only for descriptive purposes, and should not be interpreted as indicating or implying Its relative importance or implicitly indicates the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In addition, the technical solutions of the various embodiments can be combined with each other, but it must be based on the realization of those skilled in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist , nor within the scope of protection required by the present invention.

As shown in Figures 1-4, this application proposes a wireless charging coil 11, which includes:

Coil group 13, described coil group 13 is wound by litz wire;

The magnetic plate group 12, the magnetic plate group 12 at least includes a first magnetic plate layer 121 and a second magnetic plate layer 122, the first magnetic plate layer 121 is arranged on the coil group 13, and the first magnetic plate layer The plate layer 121 is spliced by a plurality of first magnetic cores, the second magnetic plate layer 122 is arranged on the side of the first magnetic plate layer 121 away from the coil group 13, and the second magnetic plate layer 122 is used for Shielding the splicing gap between the first magnetic cores in the first magnetic plate layer 121, so as to extend the outer surface of the magnetic force lines 131 flowing through the splicing gap between the first magnetic cores in the first magnetic plate layer 121. Leakage path to slow down the leakage of the magnetic lines of force 131.

The wireless charging coil 1 uses the principle of electromagnetic wave induction to charge, and there is a coil group 13 at the transmitting end of the wireless charging coil 1 and the receiving end of the wireless charging coil 1, but the transmitting end of the wireless charging coil 1 and the receiving end of the wireless charging coil 1 The coil group at the end is different. The transmitting end is used to transmit electromagnetic induction signals to the electric equipment to charge the electric equipment. The receiving end is used to receive the electromagnetic induction signals emitted by the charging equipment. Specifically, the coil at the transmitting end The group 13 is connected to a wired power supply to generate electromagnetic signals, and through the continuous energy coupling of the coil group 13, the receiving end coil group 13 induces the electromagnetic signal at the sending end to generate high-frequency alternating current, and is replaced by rectification to charge the battery, wherein the coil group 13 is composed of Litz wire is self-winding in a helical manner.

In order to allow the magnetic field energy emitted by the coil group 13 at the transmitting end to act on the coil group 13 at the receiving end as much as possible, here it is necessary to guide the magnetic field emitted by the coil group 13 at the transmitting end, so a magnetic plate group is provided on the coil group 13 at the transmitting end 12. The magnetic plate group 12 plays the role of magnetic conduction, and provides a return circuit for the magnetic force lines 131 of the magnetic field at the transmitting end, so that the gathered magnetic field acts on the coil group 13 at the receiving end as much as possible to achieve the maximum transmission efficiency; due to the magnetic field The magnetic plate layers in the plate group 12 are mostly spliced by multiple magnetic plates, and the magnetic plates are easily deformed or cracked after splicing, so that the gap at the splicing position of the magnetic plates is enlarged, so that the magnetic field flowing through the magnetic plate layers The magnetic lines of force 131 flow from the gap, resulting in serious energy loss. For this reason, the technical solution of this embodiment adds a second magnetic plate layer 122 on the basis of the first magnetic plate layer 121, and shields the first magnetic plate through the second magnetic plate layer 122. The first magnetic plate layer 121 is located between the coil group 13 and the second magnetic plate layer 122, and the first magnetic plate layer 121 provides the magnetic field line 131 loop for the magnetic field of the coil group 13. , part of the magnetic force lines 131 flow out from the gap between the first magnetic cores, due to the shielding of the second magnetic slab layer 122, the outflowing magnetic force lines 131 continue to form a loop in the second magnetic slab layer 122, and if the outflowing magnetic force lines 131 leak out again It needs to pass through the gap of the second magnetic field layer to slow down the leakage of the magnetic force lines 131 flowing through the splicing gap between the first magnetic cores in the first magnetic plate layer 121 .

Wherein, the junction surface spliced between the plurality of first magnetic cores is the extension path of the magnetic force line, wherein the junction surface can be a chamfered surface, a circular arc surface, a regular junction surface and/or an irregular junction surface, so as to realize extending the flow through the first magnetic core. The leakage path of the magnetic force lines 131 in the splicing gap between the first magnetic cores in a magnetic plate layer 121 slows down the leakage of the magnetic force lines 131, reduces the magnetic field loss and improves the transmission efficiency. The specific shape of the joint surface can be set according to user needs.

It should be noted that the magnetic plate group 12 can be stacked by multiple magnetic plate layers, and each magnetic plate layer shields the existing gaps to reduce the energy loss flowing through. The specific number of magnetic plate layers can be set according to user needs; The second magnetic plate layer 122 can be made of a whole magnetic plate or spliced by multiple second magnetic cores. The second magnetic core can effectively shield the splicing gap between multiple first magnetic cores.

The technical solution of this embodiment adds a second magnetic field layer on the first magnetic slab layer 121, and the second magnetic field layer is used to shield the splicing gap between the first magnetic cores in the first magnetic slab layer 121, so that the coil group 13 When the generated magnetic field forms a loop of magnetic force lines 131 in the first magnetic plate layer 121, when the magnetic force lines 131 leak from the gap spliced between the first magnetic cores, the second magnetic plate layer 122 can effectively shield the magnetic force from the first magnetic plate layer 121. Leaked magnetic force lines 131, so that the magnetic force lines 131 need to leak out from the gap in the second magnetic field layer, so as to extend the outer surface of the magnetic force lines 131 flowing through the splicing gap between the first magnetic cores in the first magnetic plate layer 121 The leakage path slows down the leakage of the magnetic force lines 131, reduces the magnetic field loss and improves the transmission efficiency.

Further, the second magnetic plate layer 122 is spliced by a plurality of second magnetic cores, and the plurality of first magnetic cores and the plurality of second magnetic cores are arranged in a staggered manner, so that the second magnetic plate The spliced magnetic plates of the layers 122 shield the spliced gaps between the magnetic cores in the first magnetic plate layer 121 .

In order to avoid phenomena such as deformation and cracks caused when the size of a single magnetic core is too large, the second magnetic plate layer 122 is spliced by a plurality of second magnetic cores, and the gaps of the spliced second magnetic cores are connected with the plurality of second magnetic cores. The splicing gaps of the first magnetic cores are staggered so that the spliced magnetic plates of the second magnetic plate layer 122 can effectively shield the splicing gaps between the magnetic cores in the first magnetic plate layer 121 .

It should be noted that the joints spliced between the multiple second magnetic cores are the extended paths of the magnetic force lines, wherein the joints can be beveled, arcuate, regular and/or irregular joints to achieve extended flow through The leakage path of the magnetic force lines 131 in the splicing gap between the first magnetic cores in the first magnetic slab layer 121 slows down the leakage of the magnetic force lines 131, reduces the magnetic field loss and improves the transmission efficiency. The shape of the specific junction can be based on user needs set up.

Further, the coil assembly 13 includes an output end and an input end, the input end is provided with a first lead wire 132, the output end is provided with a second lead wire 133, and the magnetic plate assembly 12 faces the coil assembly 13. The surface is concavely formed with a wire groove, and the first wire 132 passes through the wire groove and extends to the outside of the magnetic plate assembly 12 .

Coil group 13 usually uses a metal litz wire to wind inward step by step to form multiple coils in turn. Therefore, there is a litz line segment closest to the center of coil group 13, which is the coil group 13. The first lead wire 132 is connected to the input end of the coil group 13, and a section of Litz line segment at the output end of the coil group 13 is the second lead wire 133, so the first lead wire 132 at the center of the coil group 13 needs to pass through The magnetic plate is drawn out to the outside of the magnetic plate and connected to the corresponding external equipment, that is, a notch for placing the first lead wire 132 of the coil group 13 needs to be opened on the first magnetic plate layer 121 , and the first magnetic plate layer 121 The surface facing the plurality of coils is concavely formed with lead wire slots, the first lead wires 132 pass through the lead wire slots and extend to the outside of the first magnetic plate layer 121, and the size of the lead wire slots is sufficient to accommodate the coil group 13. The first lead wire 132, and the groove bottom of the lead wire slot is still a magnetic plate, and the lead wire slot is only open at one end, so as to ensure that the first lead wire 132 is still on the magnetic plate, and ensure the integrity of the first magnetic plate layer 121 as a whole. 13 When receiving energy (that is, electric energy) remotely, prevent energy loss and local excessive heating at the lead slot, and at the same time, ensure that the magnetic plate and coil group 13 are in a state of complete bonding, effectively reducing energy loss and electromagnetic interference. Improve transmission efficiency.

Further, the wireless charging coil 11 also includes a casing 14, the casing 14 is concavely provided with an accommodating groove, the coil group 13 and the magnetic plate group 12 are placed in the accommodating groove, and the coil The side of the set 13 facing away from the magnetic plate set 12 is close to the bottom of the accommodating groove.

In order to increase the stability of electromagnetic induction, the coil group 13 and the magnetic plate group 12 are placed in the accommodation groove provided by the casing 14, and the side of the coil group 13 away from the magnetic plate group 12 is close to the bottom of the accommodation groove, so as to Enhance the stability of the wireless charging coil 11 when charging, and avoid magnetic field interference caused by external metal contact.

Further, the area of the first magnetic plate layer 121 close to the coil set 13 is adapted to the coverage area of the Litz wire in the coil set 13 .

In order to improve the transmission efficiency, the area of the first magnetic slab layer 121 near the coil group 13 is adapted to the coverage area of the Litz wire in the coil group 13, so that the magnetic field energy emitted by the coil group 13 is derived from the magnetic slab layer as much as possible. , so as to gather the magnetic field to make it act on the coil at the receiving end as much as possible, so as to achieve the maximum transmission efficiency.

The present invention also proposes a wireless charging device. The wireless charging device includes the wireless charging coil as described above. For the specific structure of the wireless charging coil, refer to the above-mentioned embodiments. Since this wireless charging device adopts all the technologies of all the above-mentioned embodiments Therefore, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, and will not repeat them one by one here. The wireless charging coil includes a transmitting end, and the transmitting end is used to transmit electromagnetic induction signals to electric equipment , so as to charge the electric device, or, the wireless charging coil further includes a receiving end, and the receiving end is used for receiving the electromagnetic induction signal emitted by the charging device. When the wireless charging device includes a wireless charging coil with the transmitting end, the wireless charging device is a wireless charger; when the wireless charging device includes a wireless charging coil with the receiving end, the wireless charging device is a equipment.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Under the conception of the present invention, the equivalent structural transformation made by using the description of the present invention and the contents of the accompanying drawings, or directly/indirectly used in Other relevant technical fields are included in the patent protection scope of the present invention.

Claims (7)

1. A wireless charging coil, comprising:

A coil assembly wound from litz wire;

magnetic sheet group, magnetic sheet group includes first magnetic sheet layer and second magnetic sheet layer at least, first magnetic sheet layer set up in on the coil assembly, just first magnetic sheet layer is by a plurality of first magnetic cores concatenation, second magnetic sheet layer set up in first magnetic sheet layer deviates from one side of coil assembly, second magnetic sheet layer is used for shielding in the first magnetic sheet layer the gap of concatenation between the first magnetic core flows through in the first magnetic sheet layer the route of leaking of the magnetic line of force of concatenation gap between the first magnetic core slows down the magnetic line of force and leaks.

2. The wireless charging coil of claim 1, wherein the second magnetic sheet layer is spliced by a plurality of second magnetic cores, and a plurality of the first magnetic cores are arranged in a staggered manner with respect to a plurality of the second magnetic cores such that the spliced magnetic sheet of the second magnetic sheet layer shields a gap spliced between the magnetic cores in the first magnetic sheet layer.

3. The wireless charging coil of claim 1, wherein the coil assembly comprises an output end and an input end, the input end is provided with a first lead, the output end is provided with a second lead, a lead groove is formed in a surface of the magnet plate assembly facing the coil assembly, and the first lead penetrates through the lead groove and extends to the outside of the magnet plate assembly.

4. The wireless charging coil according to claim 1, further comprising a housing, wherein a containing groove is concavely formed in the housing, the coil assembly and the magnetic plate assembly are placed in the containing groove, and one side of the coil assembly, which faces away from the magnetic plate assembly, is tightly attached to the bottom of the containing groove.

5. The wireless charging coil of claim 1, wherein the junction spliced between the plurality of first magnetic cores is an extended path of magnetic lines of force, wherein the junction can be a chamfered surface, a circular arc surface, a regular junction, and/or an irregular junction.

6. The wireless charging coil of claim 1, wherein an area of a side of the first magnetic plate layer near the coil assembly is adapted to a coverage area of litz wire in the coil assembly.

7. a wireless charging apparatus, comprising the wireless charging coil of any of claims 1-6, the wireless charging coil comprising a transmitting end or a receiving end.