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Shielding sheet with air gap and manufacturing method of shielding sheet

A manufacturing method and shielding sheet technology, which is applied in magnetic core manufacturing, inductor/transformer/magnet manufacturing, electrical components, etc., can solve problems such as uneven distribution of magnetic field, inability to fully exert the shielding effect of soft magnetic materials, and large thickness of shielding sheet , to achieve good shielding effect, improve anti-saturation ability, and good performance

Pending Publication Date: 2019-03-01
SUNWAY COMM JIANGSU CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the current wireless charging coil is helical, its magnetic field is not uniformly distributed in the plane of the shielding sheet, but presents a radial distribution, which is specifically manifested as a stronger magnetic field at the center of the coil and a weaker magnetic field at the periphery of the coil.
Designing the air gap on the shielding sheet as a uniform structure cannot give full play to the shielding effect of the soft magnetic material. Therefore, in order to ensure the shielding effect of the shielding sheet on the shielding sheet, the thickness of the existing shielding sheet is too large

Method used

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  • Shielding sheet with air gap and manufacturing method of shielding sheet
  • Shielding sheet with air gap and manufacturing method of shielding sheet
  • Shielding sheet with air gap and manufacturing method of shielding sheet

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Embodiment 1

[0030] Please refer to figure 1 and figure 2 , Embodiment 1 of the present invention is: a shielding sheet with an air gap, including a magnetic sheet 1, an air gap structure 2 is arranged on the magnetic sheet 1, and the air gap structure 2 is radial. The total length of the air gap structure 2 corresponding to the unit area is adapted to the magnetic field strength distribution of the charging coil. In the region with a strong magnetic field, the total length of the air gap structure 2 corresponding to the region is long; in the region with a weak magnetic field, the corresponding air gap in the region Structure 2 has a short overall length. According to the theory of demagnetization field, the region where the total length of the air gap structure 2 is long has low magnetic permeability; the region where the total length of the air gap structure 2 is short has high magnetic permeability.

[0031] In this embodiment, the air gap structure 2 includes a plurality of cutouts...

Embodiment 2

[0037] Embodiment 2 of the present invention is: the manufacturing method of the shielding sheet with air gap, the alloy composition is Fe73.5Cu1Nb3Si15.5B7 (at.%), 60mm wide, 20 μ m thick nanocrystalline ribbons are wound into an inner diameter of 100mm, A ring-shaped iron core with an outer diameter of 120 mm is placed in a heat treatment device (such as an oven) and heat-treated at 550° C. for 1 hour under an argon protective atmosphere.

[0038] The heat-treated nanocrystalline iron core is coated, that is, a layer of 5 μm insulating glue 3 is pasted on one side of the magnetic sheet 1, and then the coated magnetic sheet 1 is laminated into a three-layer nanocrystalline structure to obtain a semi-finished product.

[0039] The radial air gap structure 2 is cut on the semi-finished product with a cutting device, and the outline of the semi-finished product is die-cut to make the outer periphery of the semi-finished product circular, and the ratio of the total length of the a...

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Abstract

The invention discloses a shielding sheet with an air gap and a manufacturing method of the shielding sheet. The shielding sheet comprises a magnetic sheet, wherein an air gap structure is arranged onthe magnetic sheet, and the air gap structure is in a radiation shape. The magnetic conductivity is gradually changed by means of the radiation-shaped air gap structure, the performance of the shielding sheet is improved, and high charging efficiency and thinner thickness can be achieved at the same time.

Description

technical field [0001] The invention relates to the technical field of wireless charging, in particular to a shielding sheet with an air gap and a manufacturing method thereof. Background technique [0002] For consumer electronic products, wireless charging has the advantages of convenient operation and strong versatility. Therefore, electronic products capable of wireless charging are very popular among consumers. There are two main principles of wireless charging, one is magnetic induction, and the other is magnetic resonance. Among them, magnetic induction is the main method of wireless charging at present. The principle of magnetic induction wireless charging is similar to a transformer, that is, it contains two coils. The coil at the transmitting end emits electric energy in an electromagnetic field with a frequency of 110kHz to 400kHz. The coil at the receiving end receives the electromagnetic field at the transmitting end through electromagnetic induction, and then c...

Claims

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Application Information

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IPC IPC(8): H02J50/70H01F3/04H01F41/02
CPCH02J50/70H01F3/04H01F41/0213
Inventor 刘开煌李家洪王磊虞成城
Owner SUNWAY COMM JIANGSU CO LTD
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