Layered Double-D Coil Structure for Efficient Wireless Power Transfer

The patent transitions from a conventional single-plane coil configuration to a three-dimensional layered structure with multiple coil layers stacked vertically. This dimensional change allows the magnetic fields from multiple layers to constructively interfere, concentrating the magnetic flux in the desired direction (toward the receiver) while reducing lateral leakage, thereby improving transfer efficiency and reducing harmful electromagnetic exposure

The patent combines multiple coil layers with identical winding patterns and orientations into a single integrated wireless power transfer system. The coils in different layers are positioned such that their magnetic fields overlap constructively, merging their individual contributions to create a stronger, more focused magnetic field that improves power transfer efficiency while the layered structure inherently confines the flux more effectively than a single large coil

The patent divides the wireless power transfer system into multiple discrete coil layers, each with a standardized double-D configuration. This segmentation allows for modular construction where each layer can be independently manufactured and then assembled into the final stacked structure, making the complexity manageable through standardization and repetition of proven design units

The patent employs a nested layered structure where multiple coil layers are stacked vertically with precise spacing and alignment. Each layer is essentially a copy of the others, nested in the vertical dimension, which simplifies the design process by reusing the same geometric pattern and winding configuration across multiple levels, thereby increasing power transmission capability without proportionally increasing design complexity