Nested Opposite-Wound Inductive Coupler for Misalignment Tolerance

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Solution Overview

Problem

Conventional wireless power transfer systems face inefficiencies due to low magnetic coupling coefficients and misalignment issues, leading to reduced efficiency and increased magnetic flux leakage, especially with larger air gaps and higher power levels.

Innovation Solution

A coupler design featuring nested coil portions wound in opposite directions, forming anti-directional coil sections, which enhances magnetic flux flow and improves alignment tolerance, reducing magnetic flux leakage and increasing efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Length of stationary object

If electromagnetic waves are used for wireless power transfer, then power can be transmitted over long distances, but the transfer efficiency is low and power loss is high

Engineering Contradiction:

Improvetransmission distanceVSAvoidpower loss

Core Design Contradiction:

Length of stationary objectVSLoss of energy

Solution Approach 1:

The patent replaces electromagnetic wave-based power transfer with magnetic induction-based power transfer. Instead of using electromagnetic waves that propagate through space and suffer from radiation losses, the invention uses magnetic fields generated by coils to induce currents in receiving coils, creating a direct magnetic coupling that significantly reduces power loss during transmission.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces magnetic fields as an intermediary between the transmitting and receiving coils. The transmitting coil generates a magnetic field that couples with the receiving coil, enabling efficient power transfer without direct electrical contact. This magnetic intermediary allows for controlled and efficient energy transfer over the air interface.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If electromagnetic waves are used for wireless power transfer, then wireless transmission is achieved, but heat generation occurs and safety hazards arise

Engineering Contradiction:

Improvewireless transmission capabilityVSAvoidheat generation

Core Design Contradiction:

Ease of operationVSObject-generated harmful factors

Solution Approach 1:

The patent substitutes electromagnetic wave propagation with magnetic induction coupling. By using closely coupled magnetic fields between transmitting and receiving coils, the system achieves wireless power transfer with minimal electromagnetic radiation and significantly reduced heat generation compared to traditional electromagnetic wave methods.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent employs alternating current in the transmitting coil to generate time-varying magnetic fields that induce periodic currents in the receiving coil. This periodic magnetic coupling enables efficient power transfer while the alternating nature of the fields reduces resistive heating effects compared to direct current or continuous electromagnetic wave transmission.

Inventive Principle:

Principle #19Periodic action

3Ease of operation

If electromagnetic waves are used for wireless power transfer, then power can be transmitted wirelessly, but the transfer rate is slow

Engineering Contradiction:

Improvewireless power transfer capabilityVSAvoidpower transfer rate

Core Design Contradiction:

Ease of operationVSProductivity

Solution Approach 1:

The patent replaces electromagnetic wave transmission with magnetic induction coupling, which enables much faster power transfer rates. The direct magnetic coupling between closely positioned coils allows for efficient energy transfer that is orders of magnitude faster than electromagnetic wave-based methods, achieving practical power transfer speeds for wireless applications.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The proposed coupler design enhances wireless power transfer efficiency and reduces magnetic flux leakage, allowing for larger air gaps and smaller coil sizes while maintaining effective power transfer.

Implementation Method 1

Wireless power transfer based on magnetic induction... a transmitting coil and a receiving coil are provided, the transmitting coil is used to receive input power and generate a magnetic field based on magnetic induction

Methodology Applied

Scientific EffectMagnetic induction: Electromagnetic Induction

Implementation Method 2

the receiving coil is used to convert a magnetic field into electrical energy through magnetic induction, and to output power

Methodology Applied

Scientific EffectMagnetic induction: Electromagnetic Induction

Data Source

PatentEP3924987B1Wireless power transfer based on magnetic induction

Publication Date: 2026.05.06 XNERGY AUTONOMOUS POWER TECH PTE LTD

Figure 1A~1F
Figure 2A~2B
Figure 3A~3C

AI summary

There is provided a coupler for wireless power transfer. The coupler includes a coil configured for wireless power transfer based on magnetic induction, the coil including a plurality of coil portions, the plurality of coil portions including a first coil portion and a second coil portion wound in opposite directions. In particular, the first coil portion is nested within the second coil portion. There is also provided a system for wireless power transfer including a wireless power transmitter including the coupler and/or a wireless power receiver including the coupler, as well as a method of manufacturing the coupler and a method of wireless power transfer using the coupler.