摘要
Abstract
The integrated technology of wireless power transfer and communication has reduced power transfer efficiency due to dual-channel crosstalk,significant resonant frequency shifts caused by coil deformation,and compromised signal reconstruction fidelity,hindering its application in bio-electromagnetism.Most existing solutions are constrained by excessive hardware complexity and impractical coupling-coil dimensions.Therefore,this study introduces a flexible coil-based information-power co-link time-division transmission system.
The proposed system employs a PWM-controlled bidirectional switch to alternate between energy and data transmission phases.The power delivery channel adopts a bilateral LCCL compensation topology,leveraging its pronounced frequency-dependent impedance characteristics to minimize cross-interference between the dual transmission paths.Based on an analysis of various coil configurations,the arc segment parallel connection structure is identified as the optimal coupling topology,demonstrating superior performance metrics.To ensure mechanical flexibility and conformability,polyimide film is adopted as the substrate material for both the coil and receiver circuitry.Furthermore,the demodulation process is enhanced by integrating a peak detection and decision circuit,thereby significantly improving signal integrity.
Simulation results across the 1～20 MHz frequency band reveal that the arc-segment parallel coil exhibits a substantially higher quality factor than conventional single-layer,double-layer series,and double-layer parallel configurations.Experimental validation confirms the system's robust performance,with a power transfer efficiency exceeding 85%at a 5 mm transmission distance,a data rate of 5 Mbit/s,and a bit error rate(BER)as low as 2×10-6.The compact design features a coupling coil with an outer diameter of 22.56 mm,a receiver circuit measuring 45 mm×37 mm×2 mm,and a transmitter circuit sized at 60 mm×55 mm×10 mm.Inductance stability analysis under mechanical deformation demonstrates that the arc-segment parallel coil exhibits markedly reduced inductance variation compared to single-layer structures.
Three key conclusions can be drawn.Firstly,the arc-segment parallel coil architecture not only improves power transfer efficiency but also effectively mitigates inductance fluctuations during deformation,thereby minimizing frequency detuning and associated performance degradation.Secondly,the addition of peak detection and decision circuitry improves the smoothness of the demodulated signal,ensuring consistently low BER.Thirdly,the time-division transmission strategy eliminates dual-channel crosstalk.High power transfer efficiency and high-speed data communication can be achieved without additional hardware or complex algorithms.As a result,the overall system volume is reduced.关键词
传能通信/生物电磁/分时传输/弧段并联/柔性线圈Key words
Power transfer and communication/bio-electromagnetism/time-division transmission/arc segment parallel connection/flexible coil分类
信息技术与安全科学
