Piezoelectric vibration energy harvesting by optimized synchronous electric charge extraction

Abstract

This article presents a novel nonlinear energy extraction technique for piezoelectric vibration energy harvesting. The proposed approach is an improvement of the previous technique, “synchronous electric charge extraction,” which is the first that optimizes the harvested power whatever the connected load. The new approach is then named as “optimized synchronous electric charge extraction.” Compared with synchronous electric charge extraction, the conversion effectiveness is enhanced while simplifying the electronic circuitry and the switch control strategy. The analytical expression of the harvested powers is derived for a classical electromechanical structure. Finally, theoretical predictions confirmed by experimental results show that optimized synchronous electric charge extraction increases the harvested power for a very large range of load resistance, which is a favorable characteristic for wideband vibration energy harvesting.

An Overview on Piezoelectric Power Generation System for Electricity Generation

“…AC-DC converter (rectifier) or AC-DC-DC converter (rectifier + chopper) can be adopted to realize the charge collector having the two functions above. The synchronous charge collecting technology [18] [19], which synchronizes the charge collecting period with the vibration period of piezoelectric vibrator, can reduce the damping brought by inverse piezoelectric effect and promote the efficiency of piezoelectric power generation equipment by 4 -9 times. It is verified by experiment that the output power of AC-DC-DC converter is almost 3 times greater than AC-DC converter [20].…”

A Nanopower Synchronous Charge Extractor IC for Low-Voltage Piezoelectric Energy Harvesting With Residual Charge Inversion

“…The OSECE topology [15] is an interesting improvement of classic SECE topology. Differently from the latter, it exploits three coupled inductors and diodes.…”

Investigating the vibration-based energy harvester characteristics to obtain maximum efficiency for an electrical interface

“…Different interfaces are reported in the literature, categorized into either passive [4][5][6][7][8][9][10][11][12] or active techniques [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. Passive techniques consist of an electrical interface built with passive switches.…”