A wpc and nfc two-in-one coil magnetic sheet module

Abstract

The utility model belongs to the technical field of magnetic shielding device, concretely relates to a WPC and NFC two in one coil magnetic sheet module. The magnetic sheet module includes WPC coil, NFC coil and composite shielding magnetic sheet, WPC coil and NFC coil are arranged side by side, the composite shielding magnetic sheet is composed of soft magnetic alloy wave absorbing material layer and nanocrystalline material layer, the soft magnetic alloy wave absorbing material layer is close to WPC coil and NFC coil one side and covers WPC coil area and NFC coil area simultaneously, the nanocrystalline material layer is far from WPC coil and NFC coil one side and only covers WPC coil area. The utility model magnetic sheet module uses the wave absorbing material of lower loss to be close to the coil, can reduce the loss in the wireless charging process. Use nanocrystalline of high magnetic permeability to be close to mobile phone other components (such as battery), can play better shielding effect. And in NFC area only uses wave absorbing material layer to cover, and optimizes NFC shielding performance.

Description

Technical Field

[0001] This utility model belongs to the field of magnetic shielding device technology, specifically relating to a WPC and NFC two-in-one coil magnetic sheet module. Background Technology

[0002] In recent years, with the development of mobile communication technology, mobile phones have become lighter, thinner, and more multifunctional, with wireless charging (WPC) and near-field communication (NFC) functions becoming standard features. Both WPC and NFC are short-range wireless technologies that exchange electromagnetic energy and information through two sets of coupled coils. However, their functional focuses differ significantly. WPC primarily uses electromagnetic fields for energy transfer and conversion, while NFC primarily uses electromagnetic fields for information transmission and exchange. Their alternating magnetic field frequencies are also quite different; WPC typically operates in the 100kHz-205kHz band (Qi wireless charging standard), while NFC typically operates at 13.56MHz. Because WPC and NFC have different functional focuses and application frequency bands, the performance requirements for their corresponding magnetic shielding materials may differ greatly. WPC magnetic shielding sheets require suitable inductance, low loss, anti-saturation, and good magnetic shielding effect at 100kHz, while NFC requires suitable inductance and low loss at 13.56MHz. Therefore, research on wide-range electromagnetic shielding materials and structures suitable for both WPC and NFC has attracted the attention of those skilled in the art.

[0003] Utility model patent CN 212278711 U discloses a wide-width electromagnetic shielding material, which is composed of at least one layer of soft magnetic alloy strip splicing layer and at least one layer of wide-width good conductor material layer laminated and pressed together. This utility model uses amorphous and nanocrystalline soft magnetic alloy strips combined with good conductor foil, significantly enhancing the shielding effect against electromagnetic fields; compared to existing amorphous and nanocrystalline shielding materials, it has a wider width and effectively reduces magnetic leakage. The splicing layer of the prior art soft magnetic alloy strip is composed of several soft magnetic alloy strips laid flat and spliced ​​together without overlap. There are at least two splicing layers of soft magnetic alloy strips, with the soft magnetic alloy strips in adjacent splicing layers overlapping and staggered. Gaps between soft magnetic alloy strips within the same splicing layer are covered by the soft magnetic alloy strip in the nearest splicing layer. Its structure and manufacturing process are relatively complex, and it cannot differentiate performance for WPC and NFC regions, making it unsuitable for the performance requirements of magnetic shielding materials in both WPC and NFC simultaneously. Utility Model Content

[0004] In view of the shortcomings and deficiencies of the existing technology, the purpose of this utility model is to provide a WPC and NFC two-in-one coil magnetic sheet module.

[0005] The objective of this utility model is achieved through the following technical solution: A WPC and NFC dual-function coil magnetic sheet module includes a WPC coil, an NFC coil, and a composite shielding magnetic sheet. The WPC coil and the NFC coil are arranged side by side. The composite shielding magnetic sheet is composed of a soft magnetic alloy absorbing material layer and a nanocrystalline material layer. The soft magnetic alloy absorbing material layer is close to the WPC coil and covers both the WPC coil area and the NFC coil area. The nanocrystalline material layer is away from the WPC coil and covers only the WPC coil area.

[0006] Furthermore, the soft magnetic alloy absorbing material layer is prepared and shaped by conventional resin curing or rolling sintering methods using carbonyl iron powder, iron-silicon soft magnetic alloy powder, iron-aluminum soft magnetic alloy powder, iron-nickel soft magnetic alloy powder, iron-silicon-aluminum soft magnetic alloy powder, iron-silicon-aluminum-nickel soft magnetic alloy powder, iron-nickel-molybdenum soft magnetic alloy powder, iron-cobalt soft magnetic alloy powder, iron-chromium soft magnetic alloy powder, iron-silicon-chromium soft magnetic alloy powder, manganese-zinc soft magnetic ferrite powder, nickel-zinc soft magnetic ferrite powder, cobalt-based amorphous soft magnetic alloy powder, cobalt-based nanocrystalline soft magnetic alloy powder, iron-based amorphous soft magnetic alloy powder, or iron-based nanocrystalline soft magnetic alloy powder with a particle size of 0.5~200μm.

[0007] The materials and molding methods used in the above-mentioned soft magnetic alloy absorbing material layer are all existing conventional soft magnetic materials and molding methods.

[0008] Furthermore, the relative permeability of the soft magnetic alloy absorbing material layer is 20~300@1MHz, and the thickness is 20μm~200μm.

[0009] Furthermore, the nanocrystalline material layer is composed of a single or multiple fragmented or unfragmented nanocrystalline layers combined with double-sided adhesive, and the relative magnetic permeability of the nanocrystalline material layer is 500~18000@100kHz, preferably 3000~15000@100kHz.

[0010] Furthermore, the composition system of the nanocrystalline layer material is Fe. (100-y-z-α-β) Cu y Nb z Si α B β , 0.5≤y≤2, 1≤z≤5, 4≤α≤16, 6≤β≤10, the thickness of a single nanocrystalline layer is 14~25μm, and the number of nanocrystalline layers is 1~10.

[0011] Furthermore, the soft magnetic alloy absorbing material layer and the nanocrystalline material layer are bonded together using double-sided adhesive.

[0012] Furthermore, a pressure-sensitive adhesive film is provided on the contact surface between the soft magnetic alloy absorbing material layer and the WPC coil and NFC coil, and a protective film is provided on the outer surface of the nanocrystalline material layer.

[0013] Compared with the prior art, the beneficial effects of this utility model are: (1) In the conventional shielding magnetic sheet structure, the magnetic material layer is formed by a composite of simple nanocrystals and double-sided adhesive (its structural schematic diagram is shown in Figure 1). Figure 4 As shown in the figure), the nanocrystalline material layer near the coil of the composite magnetic sheet of this invention is replaced with a soft magnetic alloy absorbing material layer (its structural schematic diagram is shown in the figure). Figure 3 As shown, absorbing materials typically have a permeability of 20-300 and low loss μ”, while nanocrystalline materials typically have a permeability greater than 500 and higher loss μ”. The advantage of absorbing materials having lower loss than nanocrystalline materials is particularly significant at high frequencies. Using absorbing materials with lower loss near the coil can reduce losses during wireless charging. Using nanocrystalline materials with high permeability near other components of the phone (such as the battery) can provide better shielding.

[0014] (2) For the WPC and NFC two-in-one coil magnetic sheet module, only the absorbing material layer is used to cover the NFC area to meet the NFC communication characteristics and thus optimize the NFC shielding performance. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the planar structure of the WPC and NFC two-in-one coil magnetic sheet module of this utility model.

[0016] Figure 2 This is a schematic diagram of the AA-direction cross-sectional structure of the WPC and NFC two-in-one coil magnetic sheet module of this utility model.

[0017] Figure 3 This is a schematic diagram of the stacked structure of the composite shielding magnetic sheet of this utility model.

[0018] Figure 4 This is a schematic diagram of the stacked structure of a conventional nanocrystalline shielding magnetic sheet.

[0019] The labels in the diagram are explained as follows: 1-WPC coil, 2-NFC coil, 3-composite shielding magnetic sheet, 4-soft magnetic alloy absorbing material layer, 5-nanocrystalline material layer, 5-1-nanocrystalline layer, 5-2-double-sided adhesive, 6-pressure-sensitive adhesive film, 7-protective film. Detailed Implementation

[0020] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the implementation of the present invention is not limited thereto. Example 1

[0021] A WPC and NFC integrated coil magnetic sheet module, its planar structure schematic diagram and AA-direction cross-sectional structure schematic diagram are shown below. Figure 1 and Figure 2As shown, this two-in-one coil magnetic sheet module includes a WPC coil 1, an NFC coil 2, and a composite shielding magnetic sheet 3. The WPC coil 1 and NFC coil 2 are arranged side by side. The composite shielding magnetic sheet 3 is composed of a soft magnetic alloy absorbing material layer 4 and a nanocrystalline material layer 5. The soft magnetic alloy absorbing material layer 4 is close to the WPC coil 1 and NFC coil 2 and covers both the WPC coil area and the NFC coil area. The nanocrystalline material layer 5 is away from the WPC coil 1 and NFC coil 2 and only covers the WPC coil area.

[0022] The soft magnetic alloy absorbing material layer 4 is prepared by conventional resin curing method using iron-silicon-chromium soft magnetic alloy powder with a particle size of 0.5~100μm. The relative permeability of this soft magnetic alloy absorbing material layer is 100@1MHz, and the thickness is 80μm.

[0023] The nanocrystalline material layer 5 is composed of two fragmented nanocrystalline layers 5-1 and three layers of double-sided adhesive 5-2, bonded alternately. The relative magnetic permeability of the resulting nanocrystalline material layer is 3000@100kHz. The nanocrystalline layer material composition is Fe. 73.8 Cu1Nb3Si 15.2 B7 (at. %), with a single nanocrystalline layer thickness of 16~18 μm.

[0024] A pressure-sensitive adhesive film 6 is provided on the contact surface between the soft magnetic alloy absorbing material layer 4 and the WPC coil 1 and NFC coil 2 to achieve bonding and fixation between the shielding magnetic sheet and the coil; a protective film 7 is provided on the outer surface of the nanocrystalline material layer 5. A schematic diagram of the stacked structure of the resulting composite shielding magnetic sheet 3 is shown below. Figure 3 As shown in the diagram. A schematic diagram of the corresponding stacked structure of a conventional nanocrystalline shielding magnetic sheet is shown below. Figure 4 As shown. Example 2

[0025] A WPC and NFC integrated coil magnetic sheet module has the same structural schematic diagram as Embodiment 1. The differences are as follows: The soft magnetic alloy absorbing material layer can be prepared by conventional resin curing or calendering sintering methods using existing carbonyl iron powder, iron-silicon soft magnetic alloy powder, iron-aluminum soft magnetic alloy powder, iron-nickel soft magnetic alloy powder, iron-silicon-aluminum soft magnetic alloy powder, iron-silicon-aluminum-nickel soft magnetic alloy powder, iron-nickel-molybdenum soft magnetic alloy powder, iron-cobalt soft magnetic alloy powder, iron-chromium soft magnetic alloy powder, manganese-zinc soft magnetic ferrite powder, nickel-zinc soft magnetic ferrite powder, cobalt-based amorphous soft magnetic alloy powder, cobalt-based nanocrystalline soft magnetic alloy powder, iron-based amorphous soft magnetic alloy powder, or iron-based nanocrystalline soft magnetic alloy powder with a particle size of 0.5~200μm. The resulting soft magnetic alloy absorbing material layer has a relative permeability of 20~300@1MHz and a thickness of 20μm~200μm.

[0026] The nanocrystalline material layer is composed of 1 to 10 layers of fragmented or unfragmented nanocrystalline material with a thickness of 14 to 25 μm, combined with double-sided adhesive. The relative magnetic permeability of the nanocrystalline material layer is 3000 to 15000@100kHz.

[0027] The above embodiments are preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present utility model shall be considered equivalent substitutions and shall be included within the protection scope of the present utility model.

Claims

1. A WPC and NFC integrated coil magnetic sheet module, characterized in that: The device includes a WPC coil, an NFC coil, and a composite shielding magnetic sheet. The WPC coil and the NFC coil are arranged side by side. The composite shielding magnetic sheet is composed of a soft magnetic alloy absorbing material layer and a nanocrystalline material layer. The soft magnetic alloy absorbing material layer is close to the WPC coil and the NFC coil and covers both the WPC coil area and the NFC coil area. The nanocrystalline material layer is away from the WPC coil and the NFC coil and only covers the WPC coil area.

2. The WPC and NFC integrated coil magnetic sheet module according to claim 1, characterized in that: The soft magnetic alloy absorbing material layer is prepared by resin curing or rolling sintering of carbonyl iron powder, iron-silicon soft magnetic alloy powder, iron-aluminum soft magnetic alloy powder, iron-nickel soft magnetic alloy powder, iron-silicon-aluminum soft magnetic alloy powder, iron-silicon-aluminum-nickel soft magnetic alloy powder, iron-nickel-molybdenum soft magnetic alloy powder, iron-cobalt soft magnetic alloy powder, iron-chromium soft magnetic alloy powder, iron-silicon-chromium soft magnetic alloy powder, manganese-zinc soft magnetic ferrite powder, nickel-zinc soft magnetic ferrite powder, cobalt-based amorphous soft magnetic alloy powder, cobalt-based nanocrystalline soft magnetic alloy powder, iron-based amorphous soft magnetic alloy powder, or iron-based nanocrystalline soft magnetic alloy powder with a particle size of 0.5~200μm.

3. The WPC and NFC integrated coil magnetic sheet module according to claim 1, characterized in that: The relative permeability of the soft magnetic alloy absorbing material layer is 20~300@1MHz, and the thickness is 20μm~200μm.

4. The WPC and NFC integrated coil magnetic sheet module according to claim 1, characterized in that: The nanocrystalline material layer is composed of a single or multiple fragmented or unfragmented nanocrystalline layer and double-sided adhesive, and the relative magnetic permeability of the nanocrystalline material layer is 500~18000@100kHz.

5. The WPC and NFC integrated coil magnetic sheet module according to claim 4, characterized in that: The relative magnetic permeability of the nanocrystalline material layer is 3000~15000@100kHz.

6. The WPC and NFC integrated coil magnetic sheet module according to claim 4, characterized in that: The nanocrystalline layer material has an Fe composition system. (100-y-z-α-β) Cu y Nb z Si α B β , 0.5≤y≤2, 1≤z≤5, 4≤α≤16, 6≤β≤10, the thickness of a single nanocrystalline layer is 14~25μm, and the number of nanocrystalline layers is 1~10.

7. The WPC and NFC dual-function coil magnetic sheet module according to claim 1, characterized in that: The soft magnetic alloy absorbing material layer and the nanocrystalline material layer are bonded together with double-sided adhesive.

8. The WPC and NFC integrated coil magnetic sheet module according to claim 1, characterized in that: A pressure-sensitive adhesive film is provided on the contact surface between the soft magnetic alloy absorbing material layer and the WPC coil and NFC coil, and a protective film is provided on the outer surface of the nanocrystalline material layer.

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