Multiphase Wireless Power Pad With Reduced-Permeability Coil Decoupling
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Solution Overview
Problem
Interphase coupling in polyphase IPT systems leads to increased reactive loading and imbalanced power transfer, making it difficult to drive each phase independently and reducing real power output.
Innovation Solution
A multiphase wireless power transfer pad with a permeable layer containing a region of reduced permeability to decouple coils, minimizing interphase coupling while maintaining efficient power transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If coils are placed close together in polyphase IPT systems, then power transfer capacity is improved, but interphase coupling increases causing reactive loading and power loss
Solution Approach 1:
A permeable layer with a region of reduced permeability is introduced as an intermediary between adjacent coils. This intermediate structure modifies the magnetic field distribution, allowing the coils to be placed close together for high power transfer capacity while the reduced permeability region prevents excessive magnetic coupling that would cause reactive loading and power loss.
Solution Approach 2:
The permeable layer features a localized region of reduced permeability positioned between adjacent coils. This local modification of magnetic properties allows different regions of the system to have different characteristics: high permeability areas enable strong magnetic coupling for power transfer, while the reduced permeability region between coils minimizes interphase coupling and reactive loading.
2Area of stationary object
If coils are placed close together in polyphase IPT systems, then system compactness is improved, but interphase coupling causes imbalanced power transfer
Solution Approach 1:
The permeable layer with reduced permeability region acts as a mediator between adjacent coils, enabling compact coil placement while maintaining balanced power transfer. The intermediate structure controls magnetic flux distribution to prevent unequal coupling between phases.
Solution Approach 2:
By introducing a localized region of reduced permeability between adjacent coils, the system achieves compact dimensions while maintaining balanced operation. The local modification creates symmetric magnetic pathways that ensure equal coupling for all phases.
3Loss of energy
If permeable material is added to decouple coils, then interphase coupling is reduced, but device complexity increases
Solution Approach 1:
The permeable layer serves multiple functions simultaneously: it provides structural support for the coils, guides magnetic flux for efficient power transfer, and the region of reduced permeability minimizes interphase coupling. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity.
Solution Approach 2:
Instead of adding complex decoupling structures, the invention modifies the magnetic permeability parameter of the existing permeable layer by creating a region of reduced permeability. This parameter change achieves interphase decoupling through material property modification rather than structural complexity.
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 solution achieves balanced coupling between coils, reducing interphase coupling to less than 5% and maintaining high main coupling, thus improving power transfer efficiency and balancing reactive load across phases.
Implementation Method 1
the permeable material comprises a region of reduced permeability configured to decouple the first coil from the second coil
Implementation Method 2
IPT systems use coupling structures to transfer power by magnetic coupling
Implementation Method 3
a secondary or receiver coupler or pad has a coil within which a voltage and current is induced from the field created by the primary to thereby transfer power
Data Source
AI summary
A multiphase wireless power transfer pad has at least a first coil and a second coil and permeable material which includes a region of reduced magnetic permeability configured to minimise coupling between the first and second coils.