Packaging and details of a wireless power device

摘要

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.

主权项

1. An apparatus for delivering power to a load via a wireless field, comprising:
an antenna coil; a resonant circuit comprising said antenna coil and a capacitor in series with said antenna coil, said resonant circuit configured to receive power transmitted from a transmitter via a non-modulated wireless magnetic field at a frequency; and a power converting circuit, coupled to said antenna coil, the power converting circuit configured to receive a signal at a receive power level from the antenna coil and to convert the received signal to a charging signal, the charging signal having a voltage and current satisfying the requirements of a battery and sufficient to charge the battery, the power converting circuit configured to vary an impedance based on the received power level to tune the resonant circuit such that the resonant circuit resonates at the frequency.