Enhanced synchronized switch harvesting: a new energy harvesting scheme for efficient energy extraction

Abstract

This paper presents a new technique for optimized energy harvesting using piezoelectric microgenerators called enhanced synchronized switch harvesting (ESSH). This technique is based on the concept of synchronized switch harvesting (SSH), a nonlinear technique developed for energy harvesting from structural vibration. Compared with the standard technique of energy harvesting, the new technique dramatically increases the harvested power by almost 300% at resonance frequencies in the same vibration conditions, and also ensures an optimal harvested power whatever the load connected to the microgenerator. Furthermore, the new technique (ESSH) in this paper can be truly self-powered; a self-powered circuit which implements the technique is proposed. In addition, the overall power dissipation for the control circuitry is relatively constant (only about 121 μW), which is more attractive especially at high excitation. Because the new technique (ESSH) in this paper can be truly self-powered, no external power supply is needed, making the system suitable for more application fields, especially in remote operation.

Recent Progress in Piezoelectric Conversion and Energy Harvesting Using Nonlinear Electronic Interfaces and Issues in Small Scale Implementation

“…When considering the damping effect, the DSSH allows harvesting a significant amount of energy even for low coupling coefficient (and typically requires 10 times less piezomaterial than the classical approach for the same power output), although it features the same power limit as the standard technique for highly coupled, weakly damped systems excited at one of their resonance frequencies. The DSSH may be further enhanced by leaving a small amount of energy (i.e., non zero voltage) on the intermediate capacitor, leading to the concept of Enhanced Synchronized Switch Harvesting (ESSH- [51], which allows a finer control of the trade-offs between energy extraction and voltage increase, and between extracted energy and damping effect. The ESSH approach also permits a lower sensitivity to a mismatch in the capacitance ratio [51].…”

“…The DSSH may be further enhanced by leaving a small amount of energy (i.e., non zero voltage) on the intermediate capacitor, leading to the concept of Enhanced Synchronized Switch Harvesting (ESSH- [51], which allows a finer control of the trade-offs between energy extraction and voltage increase, and between extracted energy and damping effect. The ESSH approach also permits a lower sensitivity to a mismatch in the capacitance ratio [51]. Another approach consists of using the SECE technique but adding an energy feedback loop from the energy storage stage to the piezoelectric element itself that permits applying an initial voltage to the active material [52].…”

Characterization the influences of diodes to piezoelectric energy harvester

“…Several improved interface circuits have been consequently proposed. However, it should be noted that the full-wave bridge remains as an essential part of many advanced interface circuits, such as synchronized switch harvesting on inductor (SSHI) [6], synchronous electrical charge extraction (SECE) [7], and enhanced synchronized switching harvesting (ESSH) [8] types. As one representative case, the schematic diagrams of Parallel-SSHI and Series-SSHI interface circuits are given in Figure 2.…”

Design optimization and experimental analysis of Piezoelectric Energy harvester

“…Among these different types of conversion, piezoelectric transducers have been of great promise and interest. In an energy harvesting system using piezoelectric materials, mechanical energy can be converted to electrical energy through the piezoelectric effect, and the wasted energy such as wind and tidal energy and the generated vibrations on the structure will be reutilized [14]. Vibration is one of the most commonly available forms of ambient energy, found in civil structures, machines, the human body, etc.…”