Tiled Wireless Charging Coil for Uniform Magnetic Field
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional wireless charging systems face challenges in extending the active charging area due to increased radiating and ohmic losses as coil size grows, and coupling efficiency decreases when transmitter and receiver coils have significant size discrepancies, limiting power transfer efficiency.
Innovation Solution
The implementation of a tiled coil structure for the transmitter coil, where two or more coils are arranged as tiles, connected in series, and individually tuned to the same resonance frequency, optimizing coil placement and shape to achieve uniform magnetic field distribution and reduced losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a single large coil is used to extend the active charging area, then the charging coverage area increases, but the radiating and ohmic losses increase and coupling efficiency decreases
Solution Approach 1:
The patent divides a large coil structure into multiple smaller coils arranged in a tiled configuration. Each smaller coil operates independently at the same resonance frequency, collectively providing extended charging coverage while maintaining lower radiating and ohmic losses compared to a single large coil of equivalent total area.
2Area of stationary object
If a single large coil is used to extend the active charging area, then the charging coverage area increases, but the coupling efficiency between transmitter and receiver coils decreases
Solution Approach 1:
The transmitter is segmented into multiple smaller coils that can be independently optimized for coupling with the receiver coil. This segmentation allows each smaller coil to maintain better coupling efficiency with the receiver while collectively covering a larger active charging area.
Solution Approach 2:
Each smaller coil in the tiled arrangement can be locally optimized for its specific position and coupling requirements. The coils are individually tuned to the same resonance frequency, allowing local quality optimization while maintaining overall system performance across the extended charging area.
3Area of stationary object
If the size of the transmitter coil is increased to extend coverage, then the active charging area increases, but the uniformity of magnetic field distribution deteriorates
Solution Approach 1:
The large coil is segmented into multiple smaller coils arranged in a tiled pattern. This segmentation enables more uniform current distribution and magnetic field generation across the entire active charging area, as each smaller coil contributes to a more homogeneous overall field compared to a single large coil.
Solution Approach 2:
Multiple smaller coils are merged in a tiled configuration to create an extended charging area with uniform magnetic field distribution. The individual magnetic fields from each smaller coil combine constructively to produce a uniform overall field across the expanded active charging zone.
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 active charging area coverage while maintaining high coupling efficiency and power transfer, offering improved uniformity and efficiency compared to conventional single large coil designs.
Implementation Method 1
Wireless charging or inductive charging uses a magnetic field to transfer energy between two devices
Implementation Method 2
a second induction coil in the PRU (i.e., portable device) takes power from the magnetic field and converts the power back into electrical current
Implementation Method 3
Magnetic resonance coupling is the near field wireless transmission of electrical energy between two coils that are tuned to resonate at the same frequency
Data Source
AI summary
The disclosure generally relates to a method and apparatus for wireless charging station. In one embodiment, the disclosure provides an overlapping (or tiled) layout of a plurality of coils. Each coil may have a symmetric or an asymmetric turn layout. The disclosure also provides design optimization techniques configured to determine the optimal tile overlap distance and/or coil size to provide a substantially uniform electro-magnetic field over the surface of the wireless charging station.