In the realm of wireless power transfer, system control is typically managed by the communication channel from the receiver to the transmitter, a critical aspect for overall system reliability and efficiency. In mobile applications, the transmitting device commonly employs frequency modulation (FSK) due to its straightforward implementation via full bridge frequency variation. On the receiving side, load modulation can be utilized in conjunction with a Buck converter as the battery charger. However, it is well-known that such converters are relatively bulky due to the presence of the inductor, which poses a significant issue for portable devices requiring compact dimensions. This study proposes an innovative solution employing a fixed ratio switched capacitor converter (SC) with a novel modulation technique, capable of delivering higher power density and superior performance in terms of reliability compared to the conventional solution. Our approach significantly increases the power density on the receiver, addressing the challenge of high reliability without energy losses for communication.
.jpg "Li Wang photo")