Meander Coil++: A Body-scale Wireless Power Transmission Using Safe-to-body and Energy-efficient Transmitter Coil
Meander Coil++: A Body-scale Wireless Power Transmission Using Safe-to-body and Energy-efficient Transmitter Coil
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DOI：
10.1145/3491102.3502119
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发表时间：
2022-04
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影响因子：
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通讯作者：
Ryo Takahashi;Wakako Yukita;T. Yokota;T. Someya;Y. Kawahara
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文献类型：
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作者：
Ryo Takahashi;Wakako Yukita;T. Yokota;T. Someya;Y. Kawahara
用于生活记录和医疗保健的可穿戴设备已经被研究，但需要频繁充电，给长期使用带来不便。将基于纺织品的无线充电器（即线圈）集成到服装中，可以通过为使用中的身体设备充电来实现可持续的可穿戴计算。然而，传统线圈充电器产生的电磁场对人体有强烈干扰，且导电丝的高电阻导致电力传输效率低下。本文介绍了 Meander Coil++，可实现安全、节能和人体规模的无线供电。 Meander Coil++ 采用一种布线图案，可抑制电磁暴露于人体而不影响电力传输性能，并采用液态金属低损耗导电线。凭借这些进步，Meander Coil++ 能够以 25% 的 DC-DC 效率向人体设备传输几瓦的功率，同时符合有关电磁暴露的国际安全准则。我们预计 Meander Coil++ 可以在超出其小电池容量的限制的情况下，将多个设备维持在身体上数周。
Wearable devices for life-logging and healthcare have been studied, but the need for frequent charging imposes inconvenience for long-term use. Integrating textile-based wireless chargers (i.e., coil) into clothing enables sustainable wearable computing by charging the on-body devices in use. However, the electromagnetic field generated by conventional coil chargers strongly interferes with human body, and the high resistance of conductive threads leads to inefficient power delivery. This paper presents Meander Coil++, enabling safe, energy-efficient, and body-scale wireless power delivery. Meander Coil++ uses a wiring pattern that suppresses electromagnetic exposure to the human body without compromising power delivery performance and a liquid-metal-based low-loss conductive cord. With these advancements, Meander Coil++ transmits a few watts of power to on-body devices at 25% DC-to-DC efficiency while complying with international safety guidelines regarding electromagnetic exposure. We envision Meander Coil++ can maintain multiple devices on body for weeks beyond the confines of their small battery capacity.