A SMART DIAMOND-SHAPED ELECTROMAGNETIC VIBRATION ENERGY HARVESTER TARGETED ON MICROVIBRATION

The advent of advanced microelectronics has ushered in a new era for energy harvesters, which are now pivotal in powering low-power devices autonomously. This paper presents an innovative electromagnetic energy harvester integrated with diamond-shaped displacement amplification mechanism (DAM). This mechanism is designed to amplify micro-vibration sources, thereby increasing the captured energy voltage to surpass the threshold of rectifier circuits and enhance energy harvesting efficiency. Firstly, the research constructs an electromagnetic model predicated on the molecular current hypothesis and Faraday's law of electromagnetic induction. Subsequently, an accurate dynamic model of the diamond-shaped energy harvester and a single-degree-of-freedom (SDOF) electromechanical coupling model are developed. Utilizing transfer function method, the energy harvesting efficiency of the harvester is simulated, and the external circuit resistance is optimized to optimize this efficiency. Comparative analyses of the energy capture efficiency of the amplification mechanism with and without displacement scaling mechanism are conducted through Simulink simulations validation. These assessments confirm a significant improvement in energy capture efficiency attributable to the introduction of the diamond mechanism. The results contribute a novel and efficient technological approach to the field of electromagnetic vibration energy harvesting.