Wireless power transmission based on electromagnetic induction

By designing multiple coil partial couplers with nested structures, the problems of coil offset and magnetic leakage in wireless power transmission systems are solved, and efficient wireless power transmission and compact coupler design are achieved.

CN113474858BActive Publication Date: 2025-03-18XNERGY AUTONOMOUS POWER TECH PTE LTD
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Patent Information

Application Number
CN201980091303.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2019-02-15
Publication Date
2025-03-18
Estimated Expiration
2039-02-15

AI Technical Summary

Technical Problem

In existing wireless power transmission systems, the air gap between the primary and secondary coils results in a coupling coefficient less than 0.5, affecting the wireless power transmission efficiency, and conventional couplers have defects in coil offset and magnetic leakage.

Method used

A coupler is designed including multiple coil parts, the coil parts are wound in opposite directions to form a nested structure, improve the coil offset tolerance capability, and reduce magnetic leakage through the reverse coil segments.

Benefits of technology

Improves wireless power transmission efficiency, enhances coil offset tolerance capabilities, reduces magnetic leakage, and achieves a more compact coupler design, while meeting the EMF exposure guidelines provided by the International Committee on Non-Ionizing Radiation Protection (ICNIRP).

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Abstract

The present invention provides a coupler for wireless power transmission. The coupler includes a coil configured to perform wireless power transmission based on electromagnetic induction, the coil including a plurality of coil parts, the plurality of coil parts including a first coil part and a second coil part wound in opposite directions. In particular, the first coil part is nested in the second coil part. The present invention also provides a system for wireless power transmission, a method for manufacturing the coupler, and a method for wireless power transmission using the coupler, the system including a wireless power transmitter including the coupler and / or a wireless power receiver including the coupler.
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