Planar Inductive Charging Platform Auxiliary Winding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Planar inductive battery charging platforms face issues such as magnetic saturation, high switching losses, electromagnetic interference, and central voltage sag phenomena, which affect energy transfer efficiency and practicality, especially when trying to standardize charging for various portable electronic devices.
Innovation Solution
A battery charging apparatus with a first winding generating magnetic flux perpendicular to the charging surface and a second auxiliary winding located concentrically or centrally to compensate for flux reduction, ensuring uniform magnetic flux distribution across the platform.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single planar winding is used to generate magnetic flux, then the charging platform structure is simple, but central voltage sag occurs reducing energy transfer efficiency
Solution Approach 1:
The single planar winding is segmented into multiple windings (first winding and second winding) with different geometries and positions. The first winding generates primary magnetic flux while the second winding compensates for flux reduction in specific areas, eliminating central voltage sag and improving energy transfer efficiency without excessive complexity
Solution Approach 2:
Different regions of the charging platform are addressed with different winding configurations. The second winding is strategically positioned and sized to provide localized magnetic flux compensation where needed, ensuring uniform flux distribution across the platform surface while maintaining overall structural simplicity
2Ease of operation
If the charging platform is placed on a metallic surface, then practical usability is improved, but electromagnetic interference and heating effects occur
Solution Approach 1:
A non-conductive support structure is introduced as an intermediary between the planar charging platform and the metallic surface. This support structure physically separates the platform from the conductive surface, preventing harmful electromagnetic induction and heating effects while allowing the platform to remain practically usable on metallic surfaces
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 auxiliary winding significantly reduces central voltage sag and enhances energy transfer efficiency, allowing devices to be placed anywhere on the charging surface without significant loss in energy transfer, reducing electromagnetic interference, and improving practicality.
Implementation Method 1
a first winding for generating lines of magnetic flux generally perpendicular to the charging surface
Implementation Method 2
a second winding located within an area defined by the first winding for generating an auxiliary magnetic flux generally perpendicular to the charging surface, such that magnetic flux generated by the second winding compensates for a reduction in magnetic flux generated by the first winding
Data Source
AI summary
A battery charging apparatus comprises an inductive charging platform including a charging surface on which an electrical device to be charged is to be placed, and a first winding for generating lines of magnetic flux generally perpendicular to the charging surface. To compensate for voltage sag caused by a reduction in the flux generated by the first winding, a second winding is located within an area defined by the first winding for generating an auxiliary magnetic flux generally perpendicular to the charging surface.