SYSTEMS, METHODS, AND DEVICES FOR MULTI-LEVEL SIGNALING VIA A WIRELESS POWER TRANSFER FIELD

摘要

Systems, methods and apparatus are disclosed for signaling between wireless power transmitters and receivers. In one aspect a wireless power receiver is disclosed. The wireless power receiver includes an antenna circuit characterized by an impedance. The antenna circuit is configured to wirelessly receive power for powering or charging a load. The wireless power receiver further includes an impedance adjustment circuit configured to communicate multi-level signaling data values to a wireless power transmitter coupled to the receiver. The wireless power transmitter includes a controller configured to receive a signal indicative of a change in receiver impedance and determine the multi-level signaling data values based on the detected change.