无线充电 基本原理 以及 新片介绍 he P9221 is a highly-integrated wireless power transmitter and receiver dual function IC for mobile or stationary devices. The device can transmit up to 3W in WPC mode and receive up to 15W wirelessly in either WPC or PMA (Dual-mode) using near-field magnetic induction. Dual-mode operation is achieved using a single Rx coil with fixed inductance for both WPC and PMA operating modes.