针对无线功率与信息同步传输SWPIT(simultaneous wireless power and information transfer)技术中出现的共享通道传输可用谐振频率少,无法保证载波传输效率的问题,提出了一种基于双LCC电路实现 3FSK调制的三频谐振的SWPIT技术.相较于传统的 2FSK调制电路,所提电路优势在于:采用三谐振频带,系统载波均使用谐振频率,避免了对系统谐振频率的利用率低、传输效率低等缺陷;使系统在 3 种频率下正常工作,可实现全双工,提高了工作效率.所做的工作包括:低阶及高阶电路谐振腔的谐振条件分析;参数设计及频率选择;解调信号.同时,通过Simulink仿真及实验样机搭建了 150、177 和 48 kHz的实验平台,验证了所提 3FSK能量调制式技术的可行性.实验样机显示,在 3 种频率下,接收侧输出电压稳定且幅值为直流输入电压的 4/π倍,达到恒电压输出的目标.
Aimed at the problem of limited available resonant frequencies in shared channel transmission and in-ability to ensure the carrier transmission efficiency in the simultaneous wireless power and information transfer(SWPIT)technology,a three-frequency resonant SWPIT technology based on double-LCC circuit is proposed to achieve 3FSK modulation.Compared with the traditional 2FSK modulation circuit,the proposed circuit has the following advantages.First,three-frequency resonant frequency bands are adopted and all the system carriers use resonant frequencies,which avoids the defects such as a low utilization rate of system resonant frequency and a low transmission efficiency.Second,the system is enabled to operate normally at three frequencies,thus achieving full duplex and improving the working ef-ficiency.The work includes an analysis of resonant conditions for low-and high-order circuit resonators,parameter de-sign and frequency selection,and demodulation of signals.In addition,150 kHz,177 kHz and 48 kHz experimental platforms were built by Simulink simulation and an experimental prototype,thereby verifying the feasibility of the pro-posed 3FSK energy modulated technology.The experimental prototype showed that at three frequencies,the output volt-age on the receiving side was stable and its amplitude was 4/π times that of DC input voltage,achieving the goal of con-stant-voltage output.