Overlapped Coil Module for Wireless Power Concentration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless charging technologies increase the wireless charging distance by increasing the number of coil turns, leading to a more divergent magnetic field that causes heating of metal foreign bodies and reduces charging efficiency.
Innovation Solution
A coil module with multiple sets of coils connected in series and overlapped each other, along with a central magnetic column or magnetic sheet, to concentrate the alternating magnetic field and increase the coupling coefficient between the power transmitting and receiving coils.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the number of coil turns is increased to increase coupling inductance and wireless charging distance, then the wireless charging distance is improved, but the magnetic field becomes more divergent causing heating of metal foreign bodies and reduced charging efficiency
Solution Approach 1:
The patent transitions from a single-plane coil structure to a multi-layer overlapping coil structure, adding the vertical dimension to the coil arrangement. This dimensional change allows the magnetic field to be more concentrated in the vertical direction while reducing lateral divergence, thereby extending wireless charging distance without causing excessive heating of metal foreign bodies.
Solution Approach 2:
The patent combines multiple sets of coils into a single integrated coil module where the coils are overlapped in series. This merging of multiple coil structures creates a unified magnetic field that is more concentrated and directed, improving coupling with the receiving coil while reducing stray magnetic fields that cause heating.
2Reliability
If the number of coil turns is increased to increase coupling inductance, then the coupling between transmitting and receiving coils is improved, but the coil size becomes larger and the magnetic field more divergent
Solution Approach 1:
By arranging coils in multiple overlapping layers along the vertical axis rather than expanding in a single plane, the patent improves coupling coefficient through increased turn density in the vertical dimension while maintaining a compact overall shape and reducing magnetic field divergence in the horizontal plane.
Solution Approach 2:
The patent implements a nested structure where multiple coil sets are overlapped and positioned within the same spatial footprint. Each coil is nested within the projection area of the others, creating a compact configuration that enhances coupling without increasing the coil's planar dimensions or causing magnetic field divergence.
3Power
If the number of coil turns is increased, then the induced voltage at the receiving terminal is increased, but the charging efficiency is reduced due to stray magnetic field losses
Solution Approach 1:
The patent merges multiple coil structures into an overlapped series configuration that concentrates the magnetic field in the vertical direction. This consolidation increases induced voltage at the receiving terminal while minimizing stray magnetic fields, thereby maintaining high charging efficiency despite the increased number of turns.
Solution Approach 2:
By distributing coil turns across multiple vertical layers rather than expanding in a single plane, the patent increases induced voltage through greater effective turns while confining the magnetic field in the vertical dimension. This reduces horizontal magnetic field divergence and associated energy losses, preserving charging efficiency.
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 configuration enhances the concentration of the magnetic field, reducing negative influences from stray fields and increasing the wireless charging distance while maintaining efficiency.
Implementation Method 1
A wireless power transmitting terminal converts a direct current into an alternating current that generates an alternating magnetic field through the coil in the wireless power transmitting terminal
Implementation Method 2
A wireless power receiving terminal couples to the alternating magnetic field to induce a corresponding alternating voltage
Data Source
AI summary
A coil module and a wireless power transmitting circuit using the same are disclosed. At least three sets of coils are configured to be connected in series and overlapped each other, which may, in one hand, increase the coupling coefficient between the power transmitting coil and the power receiving coil, and in the other hand, make the alternating magnetic field generated by the coil module more concentrated so as to reduce negative influences caused by the strayed magnetic field around the coil module.