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该论文提出了一种用于高Q谐振感应链路的新型发射调制器/驱动器,采用自适应功率控制技术,在实现高效功率传输的同时支持FSK/PSK数据下行传输,解决了高Q线圈带宽受限和灵敏度高的问题。
As well as transferring power, inductively coupled systems such as RFID and wireless charging commonly require a downlink channel to transfer data to the receiving function, for simplicity usually using the same carrier frequency used for the power transfer. A high-Q resonant transmitter coil is highly desirable to create the strong magnetic field required for a practical operating range. However, this not only raises major problems with sensitivity to tolerances and environmental factors, but also seriously restricts the available bandwidth and hence downlink data-rate. Amplitude Shift or On-Off Keying (ASK/OOK) are commonly used to allow simple demodulation, but in addition to the Q factor restricting the data-rate, the average power transfer will be reduced by around 50%. Frequency Shift Keying (FSK) or Phase Shift Keying (PSK) are attractive inasmuch as the nominally constant envelope provides a potentially higher power
Henry Kennedy, Rares Bodnar, Teerasak Lee, William Redman-White
University of Southampton, Southampton, United Kingdom