Coupling Coefficient In A Wireless Power System

Abstract: This disclosure provides systems, methods and apparatuses that enable a Power Transmitter of a wireless power system to determine a coupling coefficient k (k-factor). The k-factor represents an amount of a magnetic field coupling between a primary coil of the Power Transmitter and a secondary coil of a Power Receiver. The k-factor impacts the effectiveness of power transfer at various operating frequencies. In some aspects, a Power Transmitter can determine the k-factor prior to a power negotiation such that the Power Transmitter can negotiate a negotiated power level limit based, in part, on considerations of potential operating frequencies and the k-factor. In some aspects, a k-factor measurement protocol enables the Power Transmitter and the Power Transmitter to coordinate k-factor evaluations prior to or during the power state.

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