Non-resonant electromagnetic energy harvester for car-key applications

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

物理学;能源学

Li, X.^1,2 ; Hehn, T.^3 ; Thewes, M.^4 ; Kuehne, I.^5 ; Frey, A.^6 ; Scholl, G.^4 ; Manoli, Y.^2,3

Research and Development, Daimler AG, Sindelfingen, Germany^1

Fritz Huettinger Department of Microelectronics, IMTEK, University of Freiburg, Germany^2

HSG-IMIT, Villingen-Schwenningen, Germany^3

Electrical Measurement Engineering, Helmut-Schmidt-University, Germany^4

Faculty of Engineering and Business Administration, Heilbronn University, Germany^5

Faculty of Electrical Engineering, Augsburg University, Germany^6

关键词: Electrical circuit;    Energy Harvester;    Large-amplitude motion;    Maintenance free;    Nd-Fe-B magnets;    Optimal design;    Power efficient;    Prototype testing;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/476/1/012096/pdf
DOI  :  10.1088/1742-6596/476/1/012096

来源: IOP

【 摘 要 】

This paper presents a novel non-resonant electromagnetic energy harvester for application in a remote car-key, to extend the lifetime of the battery or even to realize a fully energy autonomous, maintenance-free car-key product. Characteristic for a car-key are low frequency and large amplitude motions during normal daily operation. The basic idea of this non-resonant generator is to use a round flat permanent magnet moving freely in a round flat cavity, which is packaged on both sides by printed circuit boards embedded with multi-layer copper coils. The primary goal of this structure is to easily integrate the energy harvester with the existing electrical circuit module into available commercial car-key designs. The whole size of the energy harvester is comparable to a CR2032 coin battery. To find out the best power-efficient and optimal design, several magnets with different dimensions and magnetizations, and various layouts of copper coils were analysed and built up for prototype testing. Experimental results show that with an axially magnetized NdFeB magnet and copper coils of design variant B a maximum open circuit voltage of 1.1V can be observed.