Induction Coil Assembly Multi-Layer Winding for Wireless Power
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Solution Overview
Problem
Existing wireless power transfer systems face challenges in maximizing the inductance value and coupling coefficient of receiving coils within limited dimensions, leading to reduced induced voltage and efficiency in magnetic resonance wireless power transfer.
Innovation Solution
The induction coil assembly optimizes the winding manner of the coil by winding parts of the wire on both surfaces of a substrate via through holes, creating a structure that maximizes the inductance value and reduces parasitic capacitance, thereby enhancing the coupling coefficient and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If the inductance value Ld of the receiving coil is improved, then the induced voltage increases, but the coil dimensions increase
Solution Approach 1:
The patent applies dimensionality change by transitioning from a single-plane winding structure to a multi-layer three-dimensional winding structure. The coil wire is wound across multiple layers with different winding directions, creating a spatial arrangement that maximizes the area enclosed by windings within a compact footprint. This multi-dimensional approach increases inductance without proportionally increasing the planar dimensions of the coil assembly.
2Reliability
If the coupling coefficient k between transmitting coil and receiving coil is improved, then the power transfer efficiency increases, but the structural complexity of the coil increases
Solution Approach 1:
The patent implements dynamics by designing the coil structure with adjustable parameters including the number of layers, winding directions, and wire diameter. These dynamic design parameters allow optimization of the coupling coefficient k to match the specific requirements of different wireless power transfer scenarios, enabling the coil structure to be adapted for maximum coupling efficiency while maintaining manageable complexity through systematic parameter selection.
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 allows for a higher inductance value and improved efficiency in wireless power transfer by maximizing the area surrounded by windings and minimizing reactive current, leading to increased induced voltage and better power transmission efficiency.
Implementation Method 1
an induction coil assembly and a wireless power transfer system... a first part of a wire of the induction coil assembly wound on a first surface of the substrate; and a second part of the wire extended to a second surface of the substrate via one of the through holes of the substrate and wound on the second surface of the substrate
Implementation Method 2
A magnetic resonance wireless power transfer system... the compensation capacitor Cs and a transmitting coil inductor Ls resonate at a system operation frequency f0... the compensation capacitor Cd and a receiving coil inductor Ld also resonate at the frequency f0
Data Source
AI summary
An induction coil assembly and a wireless electrical power transmission system are disclosed. A wire that forms the induction coil assembly is wound on a first surface and a second surface of a substrate, two parts of the wire are coupled with each other via a through hole of the substrate, and the coil on the first surface and the coil on the second surface are wound in order of an upper surface to a lower surface, or are cross-wound according to upper-lower surfaces, so that an area surrounded by each winding of the coil is increased as much as possible on the premise of limited substrate dimensions, thereby maximizing the total inductance value of the coil and increasing an induced voltage of the coil.