Wireless charging receiving device and electronic product

Abstract

The invention relates to the technical field of wireless charging, and discloses a wireless charging receiving device, which comprises a first soft magnet, a receiving coil and a flexible circuit board, and is characterized in that the first soft magnet is provided with a first through hole; the receiving coil is arranged below the first soft magnet and comprises a first connecting end coiled on the inner side and a second connecting end coiled on the outer side; the flexible circuit board comprises an inner wire circuit and an outer wire circuit, the inner wire circuit is located above the first soft magnet and connected with the first connecting end after passing through the first through hole, and the outer wire circuit is located below the first soft magnet and connected with the second connecting end. The invention further discloses an electronic product which comprises a battery and the wireless charging receiving device. According to the wireless charging receiving device, eddy current formed on an inner wire circuit by a magnetic field of the receiving coil is reduced, the heating value of the wireless charging receiving device is reduced, and the temperature rise of an electronic product in the charging process is reduced; and meanwhile, the wireless charging efficiency is improved, and the charging speed of an electronic product is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of wireless charging, and in particular to a wireless charging receiving device and an electronic product. Background Art

[0002] The main components of the wireless charging receiving device are receiving coils, soft magnets, circuit boards, etc. The wireless charging receiving device is built into the electronic products being charged, such as mobile phones, tablets, smart watches, etc. When the electronic products being charged are close to the charging base, the transmitting coil in the charging base generates a certain current in the receiving coil of the electronic products through electromagnetic induction based on the alternating current of a certain frequency, thereby sending energy from the transmitting end to the receiving end, so that the charging base can charge the electronic products. Since there is current generated at the receiving end, the electronic products being charged will heat up, causing temperature rise problems for the electronic products. In severe cases, it will cause the electronic products to overheat, malfunction, or even explode.

[0003] In order to minimize the temperature rise of the electronic products being charged, the main charging method for electronic products such as mobile phones and tablets in the prior art is to limit the charging current of the circuit. Limiting the current will lead to low charging efficiency of the electronic products. Users feel that although the product is no longer hot, the charging is significantly slower, which reduces the user experience.

[0004] In view of the fact that the above problems are common in electronic products on the market, there is an urgent need for a wireless charging receiving device and an electronic product to solve the above technical problems. Summary of the invention

[0005] Based on the above, an object of the present invention is to provide a wireless charging receiving device and an electronic product, which can reduce the temperature rise of the electronic product during the wireless charging process and improve the charging efficiency of the electronic product.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] A wireless charging receiving device, comprising:

[0008] A first soft magnetic body, wherein the first soft magnetic body is provided with a first through hole penetrating through the upper and lower surfaces thereof;

[0009] A receiving coil is arranged below the first soft magnetic body, and comprises a first connecting end wound inside and a second connecting end wound outside;

[0010] The flexible circuit board includes an inner conductor line and an outer conductor line, wherein the inner conductor line is located above the first soft magnetic body and connected to the first connection end through the first through hole, and the outer conductor line is located below the first soft magnetic body and connected to the second connection end.

[0011] In some possible implementations, a portion of the outer conductive line is disposed directly below the first soft magnetic body, and another portion of the outer conductive line is laterally exposed from the first soft magnetic body.

[0012] In some possible embodiments, a portion of the inner conductor circuit is arranged directly above the first soft magnetic body, and another portion of the inner conductor circuit is laterally exposed to the first soft magnetic body; the end of the inner conductor circuit laterally exposed to the first soft magnetic body is connected to the end of the outer conductor circuit laterally exposed to the first soft magnetic body.

[0013] In some possible implementations, the coverage area of ​​the first soft magnetic body is larger than the coverage area of ​​the receiving coil.

[0014] In some possible implementations, the wireless charging receiving device further includes a second soft magnetic body, which is disposed above the first soft magnetic body and covers a connection position between the inner conductor line and the first connection end.

[0015] In some possible implementations, the coverage area of ​​the second soft magnetic body is smaller than the coverage area of ​​the receiving coil.

[0016] In some possible implementations, the inner conductor circuit of the flexible circuit board includes a plurality of sub-circuits arranged in parallel.

[0017] In some possible implementations, the inner conductor line of the flexible circuit board is a Litz wire or a self-adhesive enameled wire.

[0018] In some possible implementations, the flexible circuit board is a single-sided or double-sided FPC circuit board.

[0019] In some possible implementations, the wireless charging receiving device further includes a connector, which is disposed on a side of the receiving coil away from the first soft magnetic body and is used to be fixed to the electronic product. The connector is a colloid or a Mylar.

[0020] In some possible implementations, the first connection end of the receiving coil is connected to the inner conductor line of the flexible circuit board by welding, and the second connection end of the receiving coil is connected to the outer conductor line of the flexible circuit board by welding.

[0021] In some possible implementations, the receiving coil and the first soft magnetic body, and the first soft magnetic body and the flexible circuit board are fixed by bonding.

[0022] In some possible implementations, the second soft magnetic body is fixed to the first soft magnetic body by bonding.

[0023] In some possible implementations, the wireless charging receiving device further includes a heat dissipation component, and the heat dissipation component is used to dissipate heat from the receiving coil; and / or,

[0024] The wireless charging receiving device further includes a rigid protective film component, and the rigid protective film component is arranged on the outer side of the first soft magnetic body; and / or,

[0025] The wireless charging receiving device further includes a reinforcing component, and the reinforcing component is fixed on the first soft magnetic body or the receiving coil.

[0026] An electronic product comprises a battery and a wireless charging receiving device as described in any of the above schemes, wherein the wireless charging receiving device is used to charge the battery.

[0027] Beneficial effects of the present invention:

[0028] The wireless charging receiving device provided by the present invention is configured by placing the inner conductor line and the outer conductor line of the flexible circuit board on the upper and lower sides of the first soft magnetic body, wherein the inner conductor line is located above the first soft magnetic body, and the outer conductor line is located below the first soft magnetic body. After the inner conductor line passes through the first through hole, it is connected to the first connection end wound on the inner side of the receiving coil located below the first soft magnetic body, and the outer conductor line is connected to the second connection end wound on the outer side of the receiving coil. Since eddy currents are more likely to be generated in the inner conductor line in the flexible circuit board, the present invention uses the first soft magnetic body to separate the inner conductor line from the receiving coil, thereby reducing the eddy currents formed by the magnetic field of the receiving coil on the inner conductor line, effectively reducing the heat generated by the wireless charging receiving device, reducing the temperature rise of the electronic product during the charging process, and improving the user experience and the charging safety of the electronic product. Moreover, the present invention can continuously stabilize the wireless charging receiving device in a high current, full load working state, effectively improving the efficiency of wireless charging and accelerating the charging speed of electronic products. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the front structure of a wireless charging receiving device in the prior art;

[0030] Figure 2 It is a schematic diagram of the back structure of a wireless charging receiving device in the prior art;

[0031] Figure 3 It is a temperature rise simulation diagram of a wireless charging receiving device during charging in the prior art;

[0032] Figure 4 is a schematic diagram of the front structure of a wireless charging receiving device provided by an embodiment of the present invention;

[0033] Figure 5is a front structural schematic diagram of a wireless charging receiving device (the second soft magnetic body is not shown) provided in an embodiment of the present invention;

[0034] Figure 6 is a schematic diagram of the back structure of a wireless charging receiving device (connectors not shown) provided in an embodiment of the present invention;

[0035] Figure 7 is an exploded view of a wireless charging receiving device provided by an embodiment of the present invention;

[0036] Figure 8 is a schematic diagram of the structure of a receiving coil and a flexible circuit board provided in an embodiment of the present invention;

[0037] Fig. 9 It is a schematic structural diagram of an inner conductor circuit of a flexible circuit board provided by an embodiment of the present invention;

[0038] Fig.10 This is a temperature rise simulation diagram of the wireless charging receiving device provided by an embodiment of the present invention during charging.

[0039] In the figure:

[0040] 1', soft magnetic body; 2', receiving coil; 3', flexible circuit board;

[0041] 1. a first soft magnetic body; 11. a first through hole; 12. a second through hole;

[0042] 2. Receiving coil; 21. First connection end; 22. Second connection end;

[0043] 3. Flexible circuit board; 31. Inner conductor circuit; 311. Sub-circuit; 32. Outer conductor circuit;

[0044] 4. A second soft magnetic body;

[0045] 5. Connectors. DETAILED DESCRIPTION

[0046] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0047] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include the first feature being in direct contact with the second feature, or may include the first feature being in contact with the second feature through another feature between them instead of being in direct contact. Moreover, a first feature being "above", "above" and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0049] In the description of the present invention, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0050] like Figure 1-Figure 3 As shown, the wireless charging receiving device in the prior art includes a soft magnetic body 1', a receiving coil 2' and a flexible circuit board 3', wherein the receiving coil 2' and the circuits of the flexible circuit board 3' are located on the same side of the soft magnetic body 1'. This structure easily generates eddy currents in the flexible circuit board 3', thereby causing the wireless charging receiving device to generate a large amount of heat, causing the temperature rise of the electronic product to be too high. If the size of the charging current is limited, although the heating can be reduced, it is easy to cause the charging efficiency of the electronic product to be low.

[0051] In response to the above problems, this embodiment provides a wireless charging receiving device, which serves as the receiving end of a wireless charging system and can be applied to electronic products such as mobile phones, tablets, laptops, smart watches, smart glasses, etc., to solve the problems in the prior art of excessive temperature rise of electronic products during wireless charging, and slow charging speed of electronic products after limiting the charging current.

[0052] like Figures 4 to 10As shown, the wireless charging receiving device provided in this embodiment includes a first soft magnetic body 1, a receiving coil 2 and a flexible circuit board 3. The first soft magnetic body 1 has the function of electromagnetic shielding, and a first through hole 11 penetrating the upper and lower surfaces of the first soft magnetic body 1 is provided. Preferably, the first through hole 11 is arranged in the middle area of ​​the first soft magnetic body 1. The receiving coil 2 is arranged below the first soft magnetic body 1. The receiving coil 2 is specifically a winding coil containing a metal material, which is wound in a ring shape, including a first connecting end 21 wound on the inside and a second connecting end 22 wound on the outside. The first connecting end 21 is arranged below the first through hole 11, and the second connecting end 22 is close to the edge of the first soft magnetic body 1. The flexible circuit board 3 includes an inner wire circuit 31 and an outer wire circuit 32. The inner wire circuit 31 is located above the first soft magnetic body 1 and is connected to the first connecting end 21 after passing through the first through hole 11. The outer wire circuit 32 is located below the first soft magnetic body 1 and is connected to the second connecting end 22. In this way, a closed circuit can be formed to charge electronic products. In this embodiment, the flexible circuit board 3 is a single-sided or double-sided FPC circuit board.

[0053] The wireless charging device provided in this embodiment is configured by placing the inner wire circuit 31 and the outer wire circuit 32 of the flexible circuit board 3 on the upper and lower sides of the first soft magnetic body 1, wherein the inner wire circuit 31 is located above the first soft magnetic body 1, and the outer wire circuit 32 is located below the first soft magnetic body 1. After the inner wire circuit 31 passes through the first through hole 11, it is connected to the first connection end 21 wound on the inner side of the receiving coil 2 located below the first soft magnetic body 1, and the outer wire circuit 32 is connected to the second connection end 22 wound on the outer side of the receiving coil 2. Since eddy currents are more likely to be generated in the inner wire circuit 31 in the flexible circuit board 3, this embodiment uses the first soft magnetic body 1 to separate the inner wire circuit 31 from the receiving coil 2, thereby reducing the eddy currents formed by the magnetic field of the receiving coil 2 on the inner wire circuit 31, effectively reducing the heat generated by the wireless charging receiving device, reducing the temperature rise of the electronic product, and improving the user experience and the charging safety of the electronic product. Moreover, this embodiment can continuously stabilize the wireless charging receiving device in a high current and full load working state, effectively improving the efficiency of wireless charging and accelerating the charging speed of electronic products.

[0054] Optionally, a portion of the outer conductor line 32 is arranged directly below the first soft magnetic body 1, and is used to connect with the second connection end 22 of the receiving coil 2, so as to prevent the second connection end 22 from extending out of the first soft magnetic body 1; another portion of the outer conductor line 32 is laterally exposed from the first soft magnetic body 1, and is used to connect with the inner conductor line 31. Optionally, the portion of the outer conductor line 32 located directly below the first soft magnetic body 1 is in contact with the lower surface of the first soft magnetic body 1, so as to ensure the connection stability between the outer conductor line 32 and the first soft magnetic body 1.

[0055] Further, a portion of the inner wire circuit 31 is arranged directly above the first soft magnetic body 1, and is used to connect to the first connection end 21 of the receiving coil 2; another portion of the inner wire circuit 31 is laterally exposed to the first soft magnetic body 1, and the end of the inner wire circuit 31 laterally exposed to the first soft magnetic body 1 is connected to the end of the outer wire circuit 32 laterally exposed to the first soft magnetic body 1. Optionally, the portion of the inner wire circuit 31 located directly above the first soft magnetic body 1 is in contact with the upper surface of the first soft magnetic body 1 to ensure the connection stability between the inner wire circuit 31 and the first soft magnetic body 1.

[0056] Optionally, the wireless charging receiving device of this embodiment further includes a second soft magnetic body 4, which is disposed above the first soft magnetic body 1 and covers above the connection position between the inner wire line 31 and the first connecting end 21. By disposing the second soft magnetic body 4 above the inner wire line 31, this embodiment can shield the leakage magnetic field of the receiving coil 2 at the first through hole 11, further improve the electromagnetic shielding effect, and improve the performance of the wireless charging receiving device.

[0057] In this embodiment, the coverage area of ​​the first soft magnetic body 1 is larger than the coverage area of ​​the receiving coil 2, so that the receiving coil 2 can be completely installed on the first soft magnetic body 1, and the receiving coil 2 is effectively electromagnetically shielded by the first soft magnetic body 1. Further, the coverage area of ​​the second soft magnetic body 4 is smaller than the coverage area of ​​the receiving coil 2 and larger than the area of ​​the first through hole 11. In this embodiment, the size of the second soft magnetic body 4 only needs to meet the requirements of covering the connection between the inner wire line 31 and the first connection end 21, and does not need to be set too large to avoid material waste. Optionally, in this embodiment, the shape of the receiving coil 2 is annular, the first soft magnetic body 1 is a rectangular soft magnetic sheet (i.e., one end of the rectangle is set to an arc shape), and the second soft magnetic body 4 is a circular soft magnetic sheet. Of course, in other embodiments, the shapes of the receiving coil 2, the first soft magnetic body 1, and the second soft magnetic body 4 can also be set to other shapes, and are not limited to this embodiment.

[0058] In this embodiment, the materials of the first soft magnetic body 1 and the second soft magnetic body 4 can be ferrite materials, ferrite amorphous materials, ferrite amorphous nanomaterials or ferrite composite materials, etc. Preferably, the first soft magnetic body 1 and the second soft magnetic body 4 of this embodiment are both made of nanocrystalline materials or ferrites, and nanocrystallines have high saturation magnetic induction intensity, high magnetic permeability and low magnetic loss, and can be soft and ultra-thin; ferrites are prepared and sintered by ferric oxide and one or more other metal oxides (for example: nickel oxide, zinc oxide, manganese oxide, magnesium oxide, barium oxide, strontium oxide, etc.), which can be mass-produced, have stable performance, and have high mechanical processing performance.

[0059] Optionally, in this embodiment, the inner conductor circuit 31 of the flexible circuit board 3 includes a plurality of sub-circuits 311 arranged in parallel. Since the region with the strongest magnetic field (i.e., the region most likely to form eddy currents) in the flexible circuit board 3 is the inner conductor circuit 31, the inner conductor circuit 31 is subdivided into a plurality of sub-circuits 311 in this embodiment, which can further reduce the eddy currents in the circuit. Specifically, the inner conductor circuit 31 of this embodiment can be a Litz wire or a self-adhesive enameled wire. It should be noted that the above-mentioned Litz wire refers to a conductor in which a plurality of independently insulated conductors are twisted or woven together; the above-mentioned self-adhesive enameled wire refers to a conductor in which each turn of the coil is bonded to each other under appropriate solvent or heating conditions. Exemplarily, the inner conductor circuit 31 in this embodiment is a flat wire with a certain width, and the flat wire is divided into a plurality of parallel and spaced sub-circuits 311 in the region directly above the first soft magnetic body 1, which has a simple structure, is easy to process, and has stable performance.

[0060] Optionally, the wireless charging receiving device of this embodiment also includes a connector 5, which is arranged on the side of the receiving coil 2 away from the first soft magnetic body 1, and is used to fix with the electronic product. In this embodiment, by arranging the connector 5 on one side of the receiving coil 2, the wireless charging receiving device can be better assembled with a mobile phone, a tablet or other complete machine. Specifically, the connector 5 is a colloid or a Mylar. Further, the connector 5 is in the form of a sheet, and its shape is the same as that of the first soft magnetic body 1 to achieve a better connection effect. In this embodiment, when the connector 5 adopts a colloid, the colloid can be a hot melt adhesive or a pressure-sensitive adhesive, and can be a double-sided adhesive or a single-sided adhesive; when the connector 5 adopts a Mylar, a second through hole 12 that passes through the upper and lower surfaces of the first soft magnetic body 1 can be opened, and a connecting hole is also provided on the Mylar, so that the wireless charging receiving device and the electronic product can be fastened by fastening screws.

[0061] In this embodiment, the first connection end 21 of the receiving coil 2 is connected to the inner conductor line 31 of the flexible circuit board 3 by welding, and the second connection end 22 of the receiving coil 2 is connected to the outer conductor line 32 of the flexible circuit board 3 by welding. After the receiving coil 2 and the flexible circuit board 3 form a circuit, they are connected to electronic products such as mobile phones or tablets to charge the electronic products. Optionally, the receiving coil 2 and the first soft magnetic body 1, the first soft magnetic body 1 and the flexible circuit board 3, and the second soft magnetic body 4 and the first soft magnetic body 1 are all fixed by bonding, for example, bonding by single-sided tape or double-sided tape. The above connection method is easy to operate and flexible to assemble.

[0062] Optionally, the wireless charging receiving device of this embodiment further includes a heat dissipation component, which is used to dissipate heat from the receiving coil 2 to further reduce the temperature rise of the electronic product. Specifically, the heat dissipation component can be a graphite heat sink or a silicone heat sink, and the heat dissipation component is fixed to the first soft magnetic body 1 or the connector 5 by bonding to improve the heat dissipation capacity of the electronic product.

[0063] Optionally, the wireless charging receiving device of this embodiment further includes a rigid protective film component, which is arranged on the outside of the first soft magnetic body 1 to increase the rigidity of the wireless charging receiving device and improve the structural strength. Furthermore, the wireless charging receiving device further includes a reinforcing component, which is fixed to the first soft magnetic body 1 or the receiving coil 2. The reinforcing component can be a reinforcing plate, and the material of the reinforcing plate can be plastic or metal. By providing the reinforcing component, the wireless charging receiving device can have a higher strength, is not easy to deform, and better match electronic products.

[0064] Figure 3 This is a temperature rise simulation diagram of a wireless charging receiving device in the prior art when charging. Fig.10 This is a temperature rise simulation diagram of the wireless charging receiving device provided in this embodiment when charging. Figure 3 and Fig.10 From the comparison, it can be seen that compared with the traditional wireless charging receiving device, the wireless charging receiving device provided in this embodiment has less heat generation, more uniform temperature, no concentrated hot spots, and obvious temperature improvement effect, because the inner conductor line 31 is on the upper side of the first soft magnetic body 1, which reduces the eddy current formed by the magnetic field of the receiving coil 2 on the inner conductor line 31.

[0065] Furthermore, as shown in the following table, the temperature rise data of the wireless charging receiving device provided by the prior art before improvement and the improved embodiment are compared.

[0066] state Inductance(L) 100KHz=Resistance(R) Q-Factor Phase Current (A) B(Tesla) Max:Efficiency_% Max: Temperature rise Before improvement 8.2uH 281mohm 18.38 0 2 0.0395 81％ 58° After improvement 8.2uH 281mohm 18.38 0 2 0.0056 83％ 51°

[0067] The comparative experiment was conducted at a frequency of 100KHz with the same inductance L, resistance R and Q value. Among them, the inductance L is the ability of the receiving coil to store magnetic field energy, and the value of the inductance L indicates the size of the coil or the number of windings; the value of the resistance R indicates the internal resistance of the coil wire; the Q value is the quality factor, which indicates the performance of the coil at its operating frequency. The Q value is specifically the ratio of the self-inductance L of the coil to the resistance R, that is: Q = ωL / R, where ω is the angular frequency (2π multiplied by the frequency). It can be clearly seen from the table that under the same conditions, the improved scheme of this embodiment effectively reduces the value of the magnetic induction intensity B (Tesla) in the internal conductor line during wireless charging compared to the scheme of the prior art, reduces the temperature rise, improves the charging efficiency, and ensures the safety and service life of the equipment.

[0068] This embodiment also provides an electronic product, including a housing, a battery, and a wireless charging receiving device in any of the above schemes, wherein the battery and the wireless charging receiving device are both installed in the housing, and the wireless charging receiving device is used to charge the battery. When the electronic product provided in this embodiment is close to the charging base, the charging process is as follows: the transmitting coil in the charging base is supplied with alternating current to generate a constantly changing magnetic field, and the receiving coil 2 senses the changing magnetic field generated by the transmitting coil and generates an induced current, which charges the battery after subsequent processing. This embodiment reduces the eddy current formed by the magnetic field of the receiving coil 2 on the inner conductor line 31, reduces the heat generated by the wireless charging receiving device, and reduces the temperature rise of the electronic product; at the same time, it improves the efficiency of wireless charging and speeds up the charging speed of the electronic product.

[0069] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A wireless charging receiving device, characterized in that: include: A first soft magnetic body (1), wherein the first soft magnetic body (1) is provided with a first through hole (11) penetrating the upper and lower surfaces thereof; A receiving coil (2) is arranged below the first soft magnetic body (1), and the receiving coil (2) comprises a first connecting end (21) wound on the inside and a second connecting end (22) wound on the outside; A flexible circuit board (3) comprises an inner conductor line (31) and an outer conductor line (32), wherein the inner conductor line (31) is located above the first soft magnetic body (1) and is connected to the first connection end (21) through the first through hole (11), and the outer conductor line (32) is located below the first soft magnetic body (1) and is connected to the second connection end (22).

2. The wireless charging receiving device according to claim 1, characterized in that: A portion of the outer conductor line (32) is arranged directly below the first soft magnetic body (1), and another portion of the outer conductor line (32) is laterally exposed from the first soft magnetic body (1).

3. The wireless charging receiving device according to claim 2, characterized in that: A portion of the inner conductor circuit (31) is arranged directly above the first soft magnetic body (1), and another portion of the inner conductor circuit (31) is laterally exposed from the first soft magnetic body (1); the end of the inner conductor circuit (31) laterally exposed from the first soft magnetic body (1) is connected to the end of the outer conductor circuit (32) laterally exposed from the first soft magnetic body (1).

4. The wireless charging receiving device according to claim 1, characterized in that: The coverage area of ​​the first soft magnetic body (1) is greater than the coverage area of ​​the receiving coil (2).

5. The wireless charging receiving device according to claim 1, characterized in that: The inner conductor circuit (31) of the flexible circuit board (3) comprises a plurality of sub-circuits (311) arranged in parallel.

6. The wireless charging receiving device according to claim 5, characterized in that: The inner conductor line (31) of the flexible circuit board (3) is a Litz wire or a self-adhesive enameled wire.

7. The wireless charging receiving device according to claim 1, characterized in that: The first connection end (21) of the receiving coil (2) is connected to the inner conductor line (31) of the flexible circuit board (3) by welding, and the second connection end (22) of the receiving coil (2) is connected to the outer conductor line (32) of the flexible circuit board (3) by welding.

8. The wireless charging receiving device according to claim 1, characterized in that: The receiving coil (2) and the first soft magnetic body (1), and the first soft magnetic body (1) and the flexible circuit board (3) are fixed by bonding.

9. The wireless charging receiving device according to claim 1, characterized in that: The wireless charging receiving device also includes a rigid protective film component, which is arranged on the outside of the first soft magnetic body (1).

10. Electronic product, characterized in that, It comprises a battery and the wireless charging receiving device according to any one of claims 1 to 9, wherein the wireless charging receiving device is used to charge the battery.

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