Internal Repeater Coil Layout for Uniform Wireless Power Transfer

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Solution Overview

Problem

Wireless power transmission systems face challenges in achieving uniform power transmission over large areas, especially when the receiver is in motion, due to variations in the strength of the emitted field, which limits operational efficiency and user experience.

Innovation Solution

The design of transmission antennas with internal repeaters and alternating current directions in source and repeater coils enhances uniformity ratio and metal resiliency, reducing the use of conductive materials while maintaining performance, and incorporates a demodulation circuit for efficient data signal processing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If more turns, coils, and resonant bodies are used within an antenna to enhance uniformity ratio, then field uniformity is improved, but cost, bill of materials, and environmental concerns increase due to greater use of conductive materials

Engineering Contradiction:

Improvefield uniformityVSAvoidconductive materials

Core Design Contradiction:

Stability of the object's compositionVSQuantity of substance

Solution Approach 1:

The antenna is divided into multiple segments including a source coil and one or more repeater coils, each contributing to the overall magnetic field. This segmentation allows the system to achieve uniformity through distributed field generation rather than requiring a single large coil with excessive conductive material.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Repeater coils serve as intermediary elements that receive power wirelessly from the source coil and generate additional magnetic fields. These intermediaries extend the charge area and improve uniformity without requiring direct electrical connections or additional conductive material in the traditional sense.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Device complexity

If traditional single-coil transmitter designs are used, then device complexity is low, but field uniformity over large areas deteriorates

Engineering Contradiction:

Improveantenna structureVSAvoidfield uniformity

Core Design Contradiction:

Device complexityVSStability of the object's composition

Solution Approach 1:

The transmitter antenna is segmented into a source coil and repeater coils, where each segment contributes to field generation. This segmentation improves field uniformity across the charge area while maintaining manageable complexity through modular design.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The repeater coils serve multiple functions: they extend the charge area, improve field uniformity, and enable wireless power transfer to multiple receiver positions simultaneously. This multi-functionality justifies the increased structural complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Ease of operation

If receiver positioning is made flexible over large areas, then ease of operation is improved, but field uniformity deteriorates due to variations in emitted field strength

Engineering Contradiction:

Improvereceiver positioning flexibilityVSAvoidfield uniformity

Core Design Contradiction:

Ease of operationVSStability of the object's composition

Solution Approach 1:

The charge area is divided into multiple zones covered by different coil segments. Receivers can move freely within each zone while maintaining adequate coupling, providing positioning flexibility without sacrificing field uniformity through the distributed coil architecture.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system extends the charge area in spatial dimensions by adding repeater coils at different positions. This dimensional expansion creates multiple coupling points across the area, allowing flexible receiver positioning while maintaining field uniformity through the distributed architecture.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

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

This approach ensures consistent and efficient wireless power transfer across a large area with improved metal resilience and reduced electromagnetic interference, allowing for more flexible receiver positioning and dynamic signal adaptation.

Implementation Method 1

inductive and/or resonant inductive wireless power transfer, which occurs when magnetic fields created by a transmitting element induce an electric field and, hence, an electric current, in a receiving element

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Implementation Method 2

magnetic fields created by a transmitting element induce an electric field

Methodology Applied

Scientific EffectMagnetic field: Magnetic Field

Implementation Method 3

resonant inductive wireless power transfer

Methodology Applied

Scientific EffectResonance: Resonance

Data Source

PatentUS11831177B2Wireless power transmitter with internal repeater and enhanced uniformity

Publication Date: 2023.11.28 NUCURRENT INC

AI summary

An antenna for wireless power transmission includes a source coil comprised of a first conductive wire, the source coil including a first outer turn and a first inner turn, the source coil configured to connect to one or more electronic components for wireless power transfer. The antenna further includes an internal repeater coil comprised of a second conductive wire, the internal repeater coil including a second outer turn and a second inner turn, the internal repeater coil configured to have a repeater current induced in the second outer turn and the second inner turn.