Abstract
Abstract Efficiently capturing energy from environmental vibrations remains a significant challenge in sustainable energy systems. This paper presents a novel integrated vibrational energy harvesting-storage-injection system (VEHSIS) to improve energy capture efficiency. The VEHSIS comprises four main components: an Energy Harvesting Module, an Energy Storage Module, an Energy Injection Module, and a Microcontroller Control Module. The VEHSIS employs a four-magnet piezoelectric bistable structure, which decreases the height of the potential barriers and thus enables efficient energy harvesting at lower vibration amplitudes. The proposed VEHSIS incorporates a dual-capacitor mode to improve the synchronous electric charge extraction (SECE) circuit and further presents a phase-locked loop circuit and a microcontroller control method to precisely control the synchronous switching of the SECE circuit to optimize energy storage and utilization. By improving the voltage pulse perturbation technique and using the microcontroller to monitor the system status in real-time, the system is enabled to maintain high-energy orbital oscillation output under different conditions. Experimental analysis reveals that the VEHSIS improves harvesting efficiency by 3.2 times after energy injection, providing 827.5 μW in dual piezoelectric cantilever beam mode. Compared to classical energy harvesting systems, the VEHSIS offers a spontaneous energy harvesting method and a significant improvement in energy conversion efficiency, providing a new solution for self-powered devices.
Published Version
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