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首页> 美国卫生研究院文献>Sensors (Basel Switzerland) >Modeling and Characterization of Scaling Factor of Flexible Spiral Coils for Wirelessly Powered Wearable Sensors
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Modeling and Characterization of Scaling Factor of Flexible Spiral Coils for Wirelessly Powered Wearable Sensors

机译：无线可穿戴传感器柔性螺旋线圈比例因子的建模与表征

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摘要

Wearable sensors are a topic of interest in medical healthcare monitoring due to their compact size and portability. However, providing power to the wearable sensors for continuous health monitoring applications is a great challenge. As the batteries are bulky and require frequent charging, the integration of the wireless power transfer (WPT) module into wearable and implantable sensors is a popular alternative. The flexible sensors benefit by being wirelessly powered, as it not only expands an individual’s range of motion, but also reduces the overall size and the energy needs. This paper presents the design, modeling, and experimental characterization of flexible square-shaped spiral coils with different scaling factors for WPT systems. The effects of coil scaling factor on inductance, capacitance, resistance, and the quality factor ( -factor) are modeled, simulated, and experimentally validated for the case of flexible planar coils. The proposed analytical modeling is helpful to estimate the coil parameters without using the time-consuming Finite Element Method (FEM) simulation. The analytical modeling is presented in terms of the scaling factor to find the best-optimized coil dimensions with the maximum -factor. This paper also presents the effect of skin contact with the flexible coil in terms of the power transfer efficiency (PTE) to validate the suitability as a wearable sensor. The measurement results at 405 MHz show that when in contact with the skin, the 20 mm× 20 mm receiver (RX) coil achieves a 42% efficiency through the air media for a 10 mm distance between the transmitter (TX) and RX coils.
机译：可穿戴式传感器由于其紧凑的尺寸和便携性而成为医疗保健监测中的一个重要话题。但是，为可穿戴式传感器提供电源以进行连续的健康监视应用是一个巨大的挑战。由于电池体积大且需要频繁充电，因此将无线功率传输（WPT）模块集成到可穿戴和可植入传感器中是一种流行的选择。柔性传感器通过无线供电而受益，因为它不仅扩展了个人的活动范围，而且还减小了整体尺寸和能源需求。本文介绍了具有不同比例因子的WPT系统柔性方形螺旋线圈的设计，建模和实验特性。针对柔性平面线圈的情况，对线圈比例因子对电感，电容，电阻和品质因数（-因子）的影响进行了建模，仿真和实验验证。所提出的分析模型有助于估算线圈参数，而无需使用费时的有限元方法（FEM）仿真。根据比例因子提出了分析模型，以找到具有最大因子的最佳优化线圈尺寸。本文还根据功率传输效率（PTE）提出了皮肤与柔性线圈接触的效果，以验证其是否适合作为可穿戴传感器。 405 MHz的测量结果表明，当20 mm x 20 mm接收器（RX）线圈与皮肤接触时，通过空气介质，发射器（TX）和RX线圈之间的距离为10 mm，效率达到42％。

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