High compatibility wpc coil magnetic sheet module

Abstract

The utility model belongs to the technical field of magnetic shielding device, concretely relates to a kind of high compatibility WPC coil magnetic sheet module.The magnetic sheet module includes WPC coil, anti-EMI area and composite shielding magnetic sheet, the WPC coil and anti-EMI area 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 side and only covers WPC coil area, the nanocrystalline material layer is away from WPC coil side and covers WPC coil area and anti-EMI area simultaneously.The utility model magnetic sheet module has both wave-absorbing material low magnetic permeability low loss characteristics, and nanocrystalline high magnetic permeability high saturation characteristics, and it is more widely applicable for various application frequency bands, application types, and performance adjustment is more convenient.And in anti-EMI area, high magnetic permeability nanocrystalline is used to improve EMI shielding performance and enhance electromagnetic compatibility performance.

Description

Technical Field

[0001] This utility model belongs to the field of magnetic shielding device technology, specifically relating to a highly compatible WPC coil magnetic sheet module. Background Technology

[0002] Wireless charging (WPC) technology is a short-range wireless technology that transmits electrical energy through electromagnetic induction between two sets of coupled coils. In WPC modules, magnetic shielding sheets are commonly used to enhance the magnetic field strength, reduce electromagnetic radiation, and mitigate external electromagnetic interference, thereby improving wireless charging efficiency. Existing conventional WPC magnetic shielding sheets are mainly composed of simple nanocrystals and double-sided adhesive, exhibiting high permeability and good magnetic shielding effects. However, high permeability leads to higher losses (μ”), reducing wireless charging efficiency. Existing WPC coil magnetic sheet modules struggle to simultaneously achieve low losses and electromagnetic interference (EMI) immunity.

[0003] Utility model patent CN 215956974 U discloses a nanocrystalline magnetic shielding material with magnetic field and electromagnetic wave isolation functions. It is a composite of multiple materials, where the nanocrystalline magnetic material layer can be used for shielding low-frequency magnetic fields and electromagnetic waves, the iron-silicon-aluminum absorbing material layer and the iron-silicon-chromium absorbing material layer can be used for shielding mid-to-high-frequency magnetic fields and electromagnetic waves, and the copper foil layer can be used for shielding high-frequency magnetic fields and electromagnetic waves. This effectively shields magnetic fields and electromagnetic waves across various frequency bands, thereby reducing magnetic field and electromagnetic wave interference to headphones and ensuring undistorted headphone sound quality. However, this magnetic shielding material is difficult to apply to WPC modules to simultaneously achieve low loss and electromagnetic interference (EMI) immunity. 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 highly compatible WPC coil magnetic sheet module.

[0005] The objective of this utility model is achieved through the following technical solution: A highly compatible WPC coil magnetic sheet module includes a WPC coil, an EMI-resistant region, and a composite shielding magnetic sheet. The WPC coil and the EMI-resistant region 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 only the WPC coil region. The nanocrystalline material layer is away from the WPC coil and covers both the WPC coil region and the EMI-resistant region.

[0006] Furthermore, 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.

[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, pressure-sensitive adhesive films are provided on the contact surfaces of the soft magnetic alloy absorbing material layer and the WPC coil, as well as on the contact surfaces of the nanocrystalline material layer and the anti-EMI region, 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 3As 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 (such as batteries) can provide better shielding. At the same time, composite magnetic sheets of absorbing materials and nanocrystalline materials have both the low permeability and low loss characteristics of absorbing materials and the high permeability and high saturation characteristics of nanocrystalline materials, making them more applicable to various application frequency bands and application types, and easier to adjust performance.

[0014] (2) For areas with EMI resistance requirements, high permeability nanocrystals are used to improve EMI shielding performance and enhance electromagnetic compatibility performance. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the planar structure of the highly compatible WPC 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 highly compatible WPC 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-Anti-EMI area, 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 highly compatible WPC 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, the WPC coil magnetic sheet module includes a WPC coil 1, an EMI-resistant region 2, and a composite shielding magnetic sheet 3. The WPC coil 1 and the EMI-resistant region 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 only covers the WPC coil region. The nanocrystalline material layer 5 is away from the WPC coil 1 and covers both the WPC coil region and the EMI-resistant region.

[0022] The soft magnetic alloy absorbing material layer 4 is prepared by conventional resin curing method using iron-silicon-aluminum soft magnetic alloy powder with a particle size of 0.5~100μm. The relative permeability of this soft magnetic alloy absorbing material layer is 150@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 is Fe. 73.8 Cu1Nb3Si 15.2 B7 (at. %), with a single nanocrystalline layer thickness of 18~20 μm.

[0024] Pressure-sensitive adhesive films 6 are provided on the contact surfaces of the soft magnetic alloy absorbing material layer 4 and the WPC coil 1, as well as on the contact surfaces of the nanocrystalline material layer 5 and the anti-EMI region 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 highly compatible WPC 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-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. 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 highly compatible WPC coil magnetic sheet module, characterized in that: It includes a WPC coil, an EMI-resistant region, and a composite shielding magnetic sheet. The WPC coil and the EMI-resistant region 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 only covers the WPC coil region. The nanocrystalline material layer is away from the WPC coil and covers both the WPC coil region and the EMI-resistant region.

2. The highly compatible WPC 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 highly compatible WPC 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. A highly compatible WPC 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. A highly compatible WPC 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. A highly compatible WPC 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. A highly compatible WPC 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. A highly compatible WPC coil magnetic sheet module according to claim 1, characterized in that: Pressure-sensitive adhesive films are provided on the contact surfaces of the soft magnetic alloy absorbing material layer and the WPC coil, as well as on the contact surfaces of the nanocrystalline material layer and the anti-EMI region. A protective film is provided on the outer surface of the nanocrystalline material layer.

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