Multi-Phase Coil Layout for Rotationally Tolerant Wireless Power
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Solution Overview
Problem
Conventional multi-phase wireless power transfer systems face challenges with rotational misalignment, leading to reduced power ratings and efficiency, particularly in applications like charging autonomous underwater vehicles, necessitating higher voltage and current stress in single-phase systems.
Innovation Solution
A multi-phase wireless power transfer system with a circular disc-shaped coil configuration and an inductor-capacitor-capacitor to series compensation circuit, designed to maintain stable power transfer despite rotational misalignment, using a first and second coil section with oppositely facing main areas and auxiliary areas to minimize voltage and current stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multi-phase wireless power transfer coils are used, then power ratings and operational efficiency are improved, but rotational misalignment causes decline in performance
Solution Approach 1:
The wireless power transfer system is divided into multiple independent phase coils (first section and second section) with distinct orientations. Each phase coil operates independently, allowing the system to maintain power transfer capability even when individual phases experience misalignment. This segmentation enables the system to achieve both high power ratings and robustness against rotational misalignment.
Solution Approach 2:
The first and second sections are configured with oppositely oriented coil arrangements, creating an asymmetric structure where each section is optimized for different spatial orientations. This asymmetric design ensures that when the receiver rotates, at least one section maintains effective coupling, thereby maintaining operational efficiency across various misalignment angles while preserving high power transfer capability.
2Reliability
If single-phase wireless power transfer coils are used to overcome rotational misalignment, then misalignment resistance is improved, but voltage and current stress increases
Solution Approach 1:
Instead of using a single-phase system that must handle all misalignment conditions alone, the system segments the power transfer function across multiple phases with different orientations. This distribution allows each phase to operate at lower voltage and current levels while collectively providing misalignment resistance, thereby reducing stress on individual components.
Solution Approach 2:
The first and second sections are combined in a multi-phase configuration where their outputs are integrated. This merging allows the system to achieve the misalignment resistance typically associated with single-phase systems while distributing the voltage and current stress across multiple phases, thereby reducing the stress burden on each individual phase.
3Power
If precise alignment is required for optimal power rating, then power transfer efficiency is improved, but mechanical alignment complexity increases
Solution Approach 1:
The oppositely oriented coil configurations create an asymmetric system that is inherently more tolerant to rotational variations. This asymmetric design eliminates the need for precise mechanical alignment while maintaining high power transfer efficiency, as the system naturally adapts to different receiver orientations through its multi-sectional architecture.
Solution Approach 2:
The system is designed to dynamically adapt to receiver orientation changes without requiring active realignment mechanisms. The multi-phase configuration with oppositely oriented sections provides inherent flexibility, allowing the system to maintain optimal power transfer across a range of angles without complex mechanical alignment systems.
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 system maintains output voltage fluctuations within five percent under various misalignment angles, ensuring efficient power transfer to battery-powered devices like AUVs, enhancing power ratings and reducing mechanical alignment requirements.
Implementation Method 1
a first coil of a multi-phase coil configuration and having a first coil main area... a second coil of the multi-phase coil configuration separated from the first coil by a gap and having a second coil main area. The second coil main area is oppositely facing and aligned with the first coil main area to allow wireless power transfer from the first coil to the second coil
Data Source
AI summary
A power supply includes a first section couplable to a source of electrical power, and includes a first compensation circuit, and a first coil having a first coil main area. The power supply includes a second section including a second coil separated from the first coil by a gap and having a second coil main area. The second coil main area is oppositely facing and aligned with the first coil main area to allow wireless power transfer from the first coil to the second coil. The second section includes a second compensation circuit, and a rectifier to provide direct current power to a load. The second section is oppositely oriented to the first section to reduce rotational misalignment.