Magnetic conductive sheet for wireless charger and preparation method thereof

A technology of wireless charger and magnetic conductive sheet, which is applied in the manufacture of inductors/transformers/magnets, circuits, magnets, etc. It can solve the problems of poor insulation treatment effect, reduce eddy current effect, consume working magnetic field, etc., and achieve good insulation treatment effect , uniform distribution spacing, and the effect of reducing the eddy current effect

Pending Publication Date: 2019-04-23
深圳市晶磁材料技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The magnetic permeability and saturation magnetic flux density of amorphous magnetic alloy materials are ideal for wireless charging modules, but the wireless charging is an AC magnetic field, and the magnetic sheet works in the AC magnetic field. Loss, this part of the loss includes hysteresis loss, eddy current loss and other losses. Under the frequency of wireless charging, eddy current loss is an important part of the loss. Since the amorphous magnetic alloy material is a metal material, the resistivity is relatively low. If the material is not correct Further processing will generate serious eddy current loss on the amorphous magnetic alloy material during work, which

Method used

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  • Magnetic conductive sheet for wireless charger and preparation method thereof
  • Magnetic conductive sheet for wireless charger and preparation method thereof
  • Magnetic conductive sheet for wireless charger and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0039] Example 1:

[0040] Such as figure 1 As shown, the magnetic conductive sheet is configured as a single-layer first magnetic sheet. The first magnetic sheet includes an adhesive layer and first magnetic fragments adhered to the adhesive layer. A protective film is attached to the upper surface of the magnetic fragments, and a release film is attached to the lower side of the adhesive layer.

Example Embodiment

[0041] Example 2:

[0042] Such as figure 2 As shown, the magnetic conductive sheet is arranged in a laminated structure of at least two layers of first magnetic sheets, and the first magnetic sheets of each layer are adhered by an adhesive layer to form interlayer insulation; A protective film is attached to the upper surface of the first magnetic fragment in the first magnetic sheet of the upper layer, and a release film is attached to the lower side of the adhesion layer in the first magnetic sheet of the lowermost layer.

[0043] In the above-mentioned embodiment 1 and embodiment 2, the material of the first magnetic fragment is iron-based amorphous or nanocrystalline; the release film is formed as an integral part when the adhesion layer is manufactured. Specifically, the release film The combination of the film and the adhesive layer is an OCA acrylic tape, and the adhesive layer is a conventional double-sided adhesive layer.

Example Embodiment

[0044] Example 3:

[0045] Such as Figure 3 to Figure 5 As shown, the magnetic conductive sheet further includes a second magnetic sheet provided with the first magnetic sheet having a first magnetic permeability, and the second magnetic sheet has a second magnetic permeability; A laminated combination form of a magnetic sheet and a second magnetic sheet, the second magnetic sheet and the first magnetic sheet are adhered by an adhesive layer to form interlayer insulation; the uppermost layer of the magnetic sheet A protective film is attached to the upper surface of the magnetic fragments in the magnetic sheet, and a release film is attached to the lower side of the adhesive layer in the magnetic sheet of the lowermost layer.

[0046] Wherein, the second magnetic sheet includes a plurality of separated second magnetic fragments, and air medium is filled between the second magnetic fragments to insulate the second magnetic fragments from each other.

[0047] In addition, the second...

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Abstract

The invention provides a magnetic conductive sheet for a wireless charger. The magnetic conductive sheet comprises a first magnetic thin sheet composed of a plurality of crushed and separated first magnetic fragments; each first magnetic fragment is stuck and positioned through an adhesion layer; a gap is formed between every two first magnetic fragments and the gap is filled with an air medium sothat all the first magnetic fragments are mutually insulated; a protection film is laminated on the surface side of the magnetic conductive sheet. The invention further provides a preparation methodof the magnetic conductive sheet. According to the magnetic conductive sheet provided by the invention, the air medium is used as an insulating medium of the magnetic conductive sheet and the application requirements of the magnetic conductive sheet in a wireless charging technology are met; meanwhile, the eddy-current effect can be effectively reduced; the magnetic conductive sheet has the technical advantages of good insulation treatment effect and simple preparation technology.

Description

technical field [0001] The invention relates to the technical field of wireless charging applications, in particular to a magnetically conductive sheet for a wireless charger and a preparation method thereof. Background technique [0002] Wireless charging is a technology that wirelessly charges the battery of the end-use device, and the power supply end and the power receiving end do not need to be physically connected. At present, electronic devices charged by electromagnetic induction are the most common in the market. [0003] Ultra-thin magnetic alloy materials such as amorphous or nanocrystalline ribbons with high magnetic permeability are used in the prior art. The thickness range of the single-layer magnetic alloy material is 10um-30um, which can be superimposed to improve the overall inductance of the material, and the structural design is more flexible and convenient. The magnetic permeability and saturation magnetic induction of amorphous magnetic alloy material...

Claims

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Application Information

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IPC IPC(8): H01F7/00H01F41/02
CPCH01F7/00H01F41/02
Inventor 谷宏
Owner 深圳市晶磁材料技术有限公司
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