Packaging and details of a wireless power device

Abstract

A wireless power system includes a power source, power receiver, and components thereof. The system can also include a parasitic antenna that can improve the coupling to the power source in various modes. The antenna can have both a variable capacitor and a variable inductor, and both of those can be changed in order to change characteristics of the matching.

What is claimed is: 
     
         1 . An apparatus configured to transmit power via a magnetic field, the apparatus comprising:
 an antenna circuit configured to inductively transmit power via the magnetic field at a magnetic field strength level sufficient to charge or power a receiver device;   a presence detection sensor configured to use a sensor signal other than the transmitted power and which is configured to sense a movement of a living being; and   a controller configured to adjust the magnetic field strength level in response to detecting the presence of the living being, the controller further configured to provide, during a time period when the magnetic field strength is adjusted to a reduced level in response to detecting the presence of the living being, an indication that the antenna circuit is positioned relative to the receiver device to transmit a sufficient level of power to the receiver device.