Qi无线充电原理

近距电能传输——高效安全
近距电能传输一般基于电磁感应原理进行。在此技术基础上，当接收器邻近发射器时才会进行电能传输。电磁感应技术的历史长达百年，多年米一直应用于各类电子产品中—如此普及全因其简单、高效以及安全技术概览
以下将为你简要介绍无线电能传输技术。

System Overview(Communication)
Receiver sends messages
To provide control information to the transmitter
By load modulation on the power signa
Transmitter receives messages
To receive control information frorn the recelver
By de-modulation of the reflected load

Power Pick Up( Receiver)
Secondary coil (L Serial resonance capacitor (C) for efficient power transfer Parallel resonance capacitor(C, )for detection purposes Rectifier: full bridge(diode, or switched)+ capacitor Output switch for(dis)connecting the load

Receiver modulates load by Switching modulation resistor(R,n),or Switching modulation capacitor(Ca)
Transmitter de-modulates reflected load by Sensing pnmary coil curent (p)and/o Sensing primary coil voltage (V,

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