Inductive Loop Array for Wireless Power Foreign Object Mapping

The patent divides the detection system into multiple selectable induction loops arranged in a grid pattern around the transmitter coil. Each loop can be independently selected and activated to map specific regions, allowing high-resolution spatial detection without requiring a monolithic complex system. This segmentation enables precise localization of foreign objects by comparing measurements from different loop positions.

The patent implements preliminary calibration by storing expected magnetic field values for each induction loop position before actual operation. During normal operation, measured values are compared against these pre-stored reference values to detect deviations caused by foreign objects. This preliminary action eliminates the need for complex real-time analysis algorithms.

The patent uses simple induction loops made from inexpensive conductive materials that can be easily manufactured and replaced if needed. These loops are basic electrical components rather than complex sensors, significantly reducing manufacturing costs while maintaining adequate detection precision through their strategic arrangement and systematic measurement approach.

The patent achieves high detection precision by systematically varying the position parameter of induction loops around the transmitter coil rather than using expensive high-precision sensors. By changing spatial parameters (loop position, orientation) and comparing measurements across multiple positions, the system achieves accurate foreign object detection using simple, low-cost components.

The patent implements a dynamic selection mechanism where only one induction loop is activated at a time based on processing circuit instructions. The selection circuit dynamically switches between different loops in the array, and the detection circuit dynamically adjusts its measurement parameters. This dynamic operation reduces the number of simultaneous connections and simplifies the overall circuit architecture compared to having all loops active simultaneously.

The patent extracts and isolates the detection function into a separate detection circuit that works with individually selected loops rather than processing signals from all loops simultaneously. The selection circuit extracts only the relevant loop signal needed for current measurement, reducing circuit complexity by eliminating the need for complex multiplexing or simultaneous processing of all loop signals.