Human Motion Energy Harvester for Biometric Data Monitoring

13th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications

物理学;能源学

Hoffmann, D.^1 ; Folkmer, B.^1 ; Manoli, Y.^1,2

HSG-IMIT-Institute of Micromachining and Information Technology, Wilhelm-Schickard-Str.10, 78052 Villingen-Schwenningen, Germany^1

Fritz Huettinger Department of Microelectronics, Department of Microsystems Engineering-IMTEK, Georges-Koehler-Allee 102, 79110 Freiburg, Germany^2

关键词: Acceleration pulse;    Autonomous sensor systems;    Device development;    Electromagnetic conversion;    Energy Harvester;    Fully integrated;    Maximum power output;    Wireless sensor system;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/476/1/012103/pdf
DOI  :  10.1088/1742-6596/476/1/012103

来源: IOP

【 摘 要 】

In this paper we present an energy autonomous sensor system fully integrated into the heel of a shoe for biometric data monitoring. For powering the wireless sensor system a pulse-driven energy harvester was developed, which uses the acceleration-impulses from heel-strike during walking. In preparation of the device development acceleration measurements were carried out. The pulse-driven energy harvester is based on the electromagnetic conversion principle and incorporates a 4×4 coil matrix. A beam fixed at both ends is used for suspending the magnetic circuit. The geometric parameters of coil and magnetic circuit were optimized for maximum power output. For an idealized acceleration pulse with a width of 5 ms and a height of 200 m/s2an average power output of 0.7 mW was generated using a step frequency of 1 Hz. The functionality of the self-sustained sensor system is demonstrated by measuring the temperature and step-frequency of a walking person and transmitting the data to a base station. We also found that the implementation of the suspension can have a significant impact on the harvester performance reducing the power output.