Analysis, Modeling, and Validation of Cascaded Magnetics for Magnetic Energy Harvesting
Min Gao, Lifang Yi, Jinyeong Moon
Abstract
Energy harvesting technologies proliferate self-powered autonomous devices via presenting a higher degree of freedom for sensors and control elements. Among all types of energy harvesting, electromagnetic energy harvesting provides relatively denser energy and features high predictability in an amount of energy extraction and seamless accessibility in a consumption measurement. This paper illustrates an electromag-netic energy harvester, which consists of a clampable magnetic core in tandem with an ungapped magnetic core with a high permeability that extracts energy from magnetic fields induced by an AC current. The clampable core provides the convenience to be integrated with existing systems, while the core with a high permeability guarantees maximum energy extraction. A mathematical model based on the cascaded magnetic structure is proposed to calculate the length of the power transfer window and the amount of the harvested power in this paper. Simulation and experiment results, showing that the maximum error of the harvested power is less than 8%, are also provided to verify the validity of the theoretical analysis.