Preparation method of litz wire suitable for high-frequency magnetic coupling wireless charging system

A wireless charging, Litz wire technology, applied in cable/conductor manufacturing, circuits, electrical components, etc., can solve problems such as uneven current distribution, reduce skin effect, improve transmission efficiency, and reduce losses.

Active Publication Date: 2020-03-06
HARBIN INST OF TECH
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Problems solved by technology

[0004] In order to solve the problem of uneven current distribution in a large number of insulated twisted wires in the existing high-frequency wireless power transmissio

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  • Preparation method of litz wire suitable for high-frequency magnetic coupling wireless charging system
  • Preparation method of litz wire suitable for high-frequency magnetic coupling wireless charging system
  • Preparation method of litz wire suitable for high-frequency magnetic coupling wireless charging system

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[0029] combined with Figure 1 to Figure 2 Describe the specific implementation of the present invention: the present invention is applicable to the preparation method of the litz wire of the high-frequency magnetic coupling wireless charging system, the method includes the basis for selecting the radius Rs of the single-strand insulated copper wire, the total number of high-frequency wires required by the litz wire Determination of the twisting times i, the complex number of high-frequency wire bundles participating in each twisting, and the lay length. Since the skin effect strength of a conductor at high frequencies can be expressed by the skin depth coefficient, when the radius of a circular conductor is smaller than the skin depth of the conductor at a specific frequency, it can be considered that the conductor still satisfies the uniformity of the current inside the conductor. distribution conditions. Therefore, the radius Rs of the single-strand insulated copper wire r...

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Abstract

The invention relates to a preparation method of a Leeds wire suitable for a high-frequency magnetic coupling type wireless charging system, belonging to the technical field of wireless charging. Theinvention solves the problem that the current distribution in a large number of insulated twisted wires is still uneven in the prior high-frequency radio energy transmission application. The inventioncomprises the selection basis of the radius Rs of the single-strand insulated copper wire, the total stranding times i of the high-frequency conductor required by the Leeds wire, the complex number of the high-frequency conductor wire harnesses involved in each stranding and the determination of the stranding distance. Compared with the prior art wireless charging system Leeds wire, the Leeds wire structure prepared by the method of the invention can reduce the skin effect and the internal proximity effect caused by the action of the high-frequency magnetic field inside the conductor, play the role of restraining the AC impedance, thereby reducing the loss in the radio energy transmission system and improving the transmission efficiency.

Description

technical field [0001] The invention relates to a preparation method of a Litz wire suitable for a high-frequency magnetic coupling wireless charging system, and belongs to the technical field of wireless charging. Background technique [0002] In recent years, wireless power transfer technology based on electromagnetic field transfer of energy has attracted more and more attention. Products using this technology have been applied and promoted in many fields such as mobile device charging, medical products, electric vehicles, and rail transit. In order to improve the transmission efficiency of the wireless power transmission system and reduce the copper loss of the coil, it is necessary to optimize the multi-strand insulated copper stranded wire (also called Litz wire) as the coil material to reduce its equivalent series connection under high-frequency current excitation. impedance. Factors that affect the high-frequency impedance of the wire include: the current intensity ...

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Application Information

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IPC IPC(8): H01B13/02
CPCH01B13/02
Inventor 朱春波金立旸周星健宋凯魏国逯仁贵董帅
Owner HARBIN INST OF TECH
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