Foreign Object Detection And Friendly Metals

Abstract: This disclosure provides systems, methods and apparatuses for object detection by a Power Transmitter (PTx) that supports both induction heating and wireless power transfer. An object detection assessment is based on a measurement value obtained while the PTx transmits an object detection pulse (also referred to as an object detection signal). When the PTx determines that a Power Receiver (PRx) is present in the magnetic field of the PTx, the can 10 also compare the measurement value to various thresholds to determine whether a foreign object is also present in the magnetic field. The various thresholds include a PRx threshold range. In some implementations, the PRx threshold range can enable the PTx to discern between a foreign object and a PRx that contains friendly metals that would otherwise be detected as foreign objects. In some implementations, an object detection assessment can be 15 combined with a coupling factor measurement to concurrently detect for a foreign object and calculate the coupling factor between the PTx and the PRx.

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