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本论文提出一种6.78MHz无线功率传输系统，采用无线模式识别技术实现79.5%的峰值效率。该系统解决了传统方法需要额外感应线圈的问题，通过改进的负载移位键控背散射技术实现全局功率调节，提升轻载效率。
Wireless power transfer (WPT) systems are increasingly favored for applications such as implantable devices and portable electronics. In these systems, local voltage regulation on the receiver (RX) side ensures a well-regulated output voltage (Vout) under varied loading and coupling conditions. Meanwhile, global power regulation on the transmitter (TX) side improves end-to-end (E2E) efficiency, especially at light loads. For global power regulation, backscattering using load-shift keying (LSK) techniques is commonly adopted [1–6]. However, methods in [1, 2] necessitate an extra sensing coil and a data demodulator including multiple off-chip components to recover mode-switching signal containing full duty-cycle information of the RX in the TX, increasing costs and leading to poor transient responses. A constant-idle-time control is proposed in [3] to eliminate most of the off-chip components except the sensing coil by transmitting just one edge
Junfei Ge, Yu Lu, Ruoshu Yang, Dongfang Pan, Lin Cheng
University of Science and Technology of China, Hefei, China