An autonomous piezoelectric energy harvesting IC based on a synchronous multi-shots technique

Morel

Jerome

et al. 2020

Smart Mater. Struct.

This paper is a review and synthetic overlook of existing energy harvesting circuits and techniques for piezoelectric energy scavengers. We provide a hierarchical presentation based on functional analysis to distinguish between existing solutions which may look superficially similar but prove to perform very differently in practice. Based on this hierarchical presentation, definitions of topologies, architectures and techniques are given in order to avoid redundancy among existing and future solutions. Then, after a thorough and unified mathematical analysis of the general problem to address, we present a comparison of the conditions for each technique to maximize the power flow from an external vibration source to an electrical load. This analysis is meant to help researchers and engineers make optimal choices for effective implementation of Maximum Power Point Tracking (MPPT).

Section: Hb 3-stage Load Adaptation Techniquementioning

confidence: 69%

Section: { (ω (ω))mentioning

confidence: 89%

Section: -Stage Topologiesmentioning

confidence: 99%

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Maximum power point of piezoelectric energy harvesters: a review of optimality condition for electrical tuning

Morel

Jerome

et al. 2020

Smart Mater. Struct.

“…These strategies are usually called synchronized electric charge extraction (SECE), where the control of synchronized switching itself maximizes the power flow from the mechanical side to the electronics. Optimized variants of the original SECE (called ‘classical SECE’) include tunable SECE (Lefeuvre et al, 2017), phase-shift SECE (PS-SECE) (Lefeuvre et al, 2017), frequency-tuning SECE (FTSECE) (Badel and Lefeuvre, 2016), multi-shot SECE (Gasnier et al, 2014) or optimized SECE (OSECE) (Wu et al, 2014). Among these, tunable SECE (Lefeuvre et al, 2017a; Richter et al, 2014) has demonstrated strong improvements to the original SECE in terms of harvested power.…”

Section: Introductionmentioning

confidence: 99%

Tunable unipolar synchronized electric charge extraction strategy for piezoelectric energy harvesting

Journal of Intelligent Material Systems and Structures

Lefeuvre

Seok

et al. 2019

This article focuses on an intelligent control strategy to improve the performances of shunt-rectifier architectures for vibration energy harvesting. It demonstrates how proper tuning can improve the frequency bandwidth and maximum power of unipolar synchronized electric charge extraction architectures. For resonators with strong enough coupling (k 2 Q. p=2), tuning the duration of charge extraction with the oscillation frequency improves the power harvesting performances. The main differences with other similar solutions such as unipolar synchronized electric charge extraction without tuning strategy or tunable synchronized electric charge extraction are illustrated. In particular, we show how the choice of the shunt rectifier significantly affects the power response of the generator due to electromechanical coupling phenomenon. The analytical study is experimentally validated on a cantilever-based piezoelectric generator.

“…Such simple and efficient rectifiers are still widely used in microwave power conversion technologies [17,18,19] and/or inductive power transfer [20]. This rectifier circuit has also been used in specific synchronized-switching architectures for piezoelectric harvesters [21], sometimes by taking advantage of the body-diode of a MOSFET transistor, which plays the role of a rectifier [22]. Despite these few practical implementations in the field of piezoelectric energy harvesting, no analytical study has been performed, to date, to model and optimize the complex behavior of the electromechanical coupling in such systems when connected to a shunt-diode rectifier circuit.…”

Section: Introductionmentioning

confidence: 99%

Shunt-diode rectifier: a new scheme for efficient piezoelectric energy harvesting

Lefeuvre

Badel

et al. 2018

Smart Mater. Struct.

This paper highlights the interest of shunt-diode rectifiers to optimize the performances of piezoelectric vibration energy harvesters based on linear load adaptation. It provides, for the first time, a full analytical study of the input power and frequency bandwidth of such a system. We show that this architecture is well-suited for piezoelectric energy harvesting. In the presented approach, a so-called shunt diode is connected across the electrodes of the piezoelectric transducer, which makes the piezoelectric voltage unidirectional instead of alternating. Thus, DC-DC converters usually used for power optimization can be directly connected to the transducer. We show that weakly-coupled linear inertial piezoelectric energy harvesters generate higher power when connected to a shunt-diode rectifier than to a bridge rectifier. Moreover, the frequency bandwidth is enlarged by the use of the single-diode shunt rectifier, especially for strongly-coupled piezoelectric generators. The proposed architecture is also interesting for low piezoelectric voltages, at which voltage drops across the diodes used for AC-DC conversion critically degrade the power efficiency. Experimental results validate the presented analytical study and highlight the higher efficiency of the shunt-diode rectifier circuit. Compared to a standard bridge rectifier architecture, we demonstrate an increase of +43% output power on a weakly-coupled generator and an increase of +5% bandwidth on a strongly-coupled generator.