"One aspect of the disclosure provides an apparatus for wireless power transmission including: means for generating a signal; means for transmitting wirelessly the to a receiver; and means for sensing a shift in voltage at a virtual AC ground of the means for generating or the means for transmitting, where the shift in voltage is representative of a change of an input impedance of the receiver.
"Another aspect of the disclosure provides a non-transitory computer storage that stores executable program instructions that direct a wireless power transmitter to perform a process that includes: generating a signal with a push-pull driver circuit to cause a coil to wirelessly transmit the signal to a receiver; and sensing with a sensor a shift in voltage at a virtual AC ground of the push-pull driver circuit or the coil, where the shift in voltage is representative of a change of an input impedance of the receiver.
"Various implementations of systems, methods and devices within the scope of the appended claims each have several aspects, no single one of which is solely responsible for the desirable attributes described herein. Without limiting the scope of the appended claims, some prominent features are described herein.
"Details of one or more implementations of the subject matter described in this specification are set forth in the accompanying drawings and the description below. Other features, aspects, and advantages will become apparent from the description, the drawings, and the claims. Note that the relative dimensions of the following figures may not be drawn to scale.
BRIEF DESCRIPTION OF THE DRAWINGS
"FIG. 1 is a functional block diagram of an example wireless power transfer system.
"FIG. 2 is a functional block diagram of example components that may be used in the wireless power transfer system of FIG. 1.
"FIG. 3 is a schematic diagram of a portion of transmit circuitry or receive circuitry of FIG. 2 including a transmit or receive coil.
"FIG. 4 is a functional block diagram of a transmitter that may be used in the wireless power transfer system of FIG. 1.
"FIG. 5 illustrates an example wireless power transfer system including a transmitter and a receiver.
"FIG. 6A illustrates an example receiver in a receiving state.
"FIG. 6B illustrates another example receiver in another receive state.
"FIG. 7 illustrates an example wireless power transfer system including a transmitter and a receiver.
"FIG. 8A is a functional block diagram of an example transmitter.
"FIG. 8B is an example transmitter driver circuit schematic.
"FIG. 9 is a functional block diagram of an example sensor.
"FIG. 10 is an example transmitter and sensor circuit schematic.
"FIG. 11 is a graph illustrating voltages in an example transmitter and sensor circuit.
"FIG. 12 is a flowchart of an example method of sensing reverse link signaling.
"FIG. 13 is a functional block diagram of a wireless transmitter configured to sense reverse link signaling."
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