Vibration energy harvesting based on a piezoelectric nonlinear energy sink with synchronized charge extraction interface circuit. (25th September 2020)

• Record Type: Journal Article
• Authors: Li, Zhaoyu; Xiong, Liuyang; Tang, Lihua; Liu, Kefu; Mace, Brian
• Is Part Of: Journal of physics. Volume 53:Number 50(2020)
• Publication Date: 2020-09-25
• Subjects: piezoelectric energy harvesting -- nonlinear energy sink -- synchronized charge extraction -- equivalent impedance -- equivalent circuit method -- harmonic balance method; Physics -- Periodicals; 530
• DOI: 10.1088/1361-6463/abb101
• Languages: English
• ISSNs: 0022-3727

Abstract

Abstract: Nonlinear energy sink (NES) conventionally designed for vibration control has been recently explored for energy harvesting purpose. To simplify the analysis, a pure resistive load is usually used in the evaluation of the performance of NES-based energy harvesting systems. This paper investigates the performance of an NES-based energy harvesting system interfaced to a synchronized charge extraction (SCE) circuit (EHNES-SCE). For the ease of analysis, the SCE interface circuit is simplified by the equivalent impedance method. An equivalent circuit model for system-level simulation of the EHNES-SCE system is also established to confirm the feasibility of using the simplified SCE circuit. Subsequently, with the simplified SCE circuit, approximate analytical solutions of the EHNES-SCE system are derived using the harmonic balance method and the performance of the EHNES-SCE system under harmonic excitation is investigated. With the established modelling and simulation tools, the influences of electrical load and electromechanical coupling on the performance of the EHNES-SCE system are revealed. Finally, experimental results are presented to confirm the main findings from the theory and simulation and reveal that the EHNES-SCE system is able to harvest energy in a wide frequency range, regardless of the load resistance in the SCE circuit.