Auxiliary Coil Layout for High-Q Wireless Power Transfer
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Solution Overview
Problem
Wireless power transmission systems face inefficiencies due to power loss from internal resistance in coils and limitations in increasing the quality factor without increasing internal resistance, as well as restrictions on applying shielding to reduce leakage magnetic fields.
Innovation Solution
The use of auxiliary coils wound alongside the primary coils to generate additional inductance and control the quality factor without increasing the number of turns, along with shielding coils to shield leakage magnetic fields without reducing effective inductance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of turns of the coil is increased to improve the quality factor, then the inductance increases, but the internal resistance also increases
Solution Approach 1:
The patent divides the coil system into two separate coils: a feeding coil and a collecting coil. This segmentation allows each coil to be optimized independently, where the feeding coil can be designed for high inductance with appropriate turns, while the collecting coil is optimized for minimal internal resistance, thus resolving the contradiction between quality factor and energy loss
Solution Approach 2:
The patent introduces a magnetic core as an intermediary element between the feeding coil and collecting coil. This magnetic core enhances the magnetic coupling and flux density, allowing the system to achieve high quality factor and efficient power transfer without requiring excessive turns in either coil, thereby reducing internal resistance while maintaining reliability
2Object-generated harmful factors
If a shielding apparatus is applied to reduce leakage magnetic field, then the leakage magnetic field is reduced, but the effective inductance of the coil is reduced
Solution Approach 1:
The patent extracts the shielding function from the main coil structure by using a separate magnetic core that serves dual purposes: it concentrates the magnetic flux to maintain high effective inductance while its geometry and material properties inherently shield against leakage magnetic fields. This separation allows the coil to maintain full inductance without compromise from shielding structures
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 enhances the inductance and quality factor of wireless power transmission systems, improving efficiency while maintaining low internal resistance and effective shielding performance.
Implementation Method 1
When power is supplied to the feeding coil, a current is flowed in the feeding coil, and as the current is flow in the feeding coil, a feeding magnetic field is produced. The feeding magnetic field produced from the feeding coil is excited in the collecting coil, and the feeding coil and the collecting coil are inductively coupled circuits through the magnetic field
Implementation Method 2
a feeding auxiliary coil configured to be wound along with the feeding coil a plurality of times with respect to the same center as the feeding coil, generate an auxiliary magnetic field with a phase that affects the feeding coil, and provide additional inductance generated by the auxiliary magnetic field
Data Source
AI summary
A wireless power transmission apparatus comprises a feeding coil configured to be wound a plurality of times with respect to a center, generate a time-varying magnetic field according to operating frequency of a supply power, and wirelessly transmit an electrical energy to a collecting coil exposed to the time-varying magnetic field through magnetic inductive coupling; and a feeding auxiliary coil configured to be wound along with the feeding coil a plurality of times with respect to the same center as the feeding coil, generate an auxiliary magnetic field with a phase that affects the feeding coil, and provide additional inductance generated by the auxiliary magnetic field.