SLUSBC8C December 2013 – July 2018
The principle of wireless power transfer is simply an open-cored transformer consisting of transmitter and receiver coils. The transmitter coil and electronics are typically built into a charger pad, and the receiver coil and electronics are typically built into a portable device such as a cell phone. When the receiver coil is positioned on the transmitter coil, magnetic coupling occurs when the transmitter coil is driven. The flux is coupled into the secondary coil, which induces a voltage and current flows. The secondary voltage is rectified, and power can be transferred effectively to a load wirelessly. Power transfer can be managed through any of the various closed-loop control schemes.