Tunable interface for piezoelectric energy harvesting

Richter, Andreas; Strobel, Axel; Joram, Niko; Ellinger, Frank; Gopfert, Lars; Marg, R.

doi:10.1109/ssd.2014.6808750

Cited by 20 publications

(55 citation statements)

References 5 publications

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“…The piezoelectric harvester is fixed on the shaker, and its speed, displacement, and voltage waveforms are recorded for any couple of parameters ( , ). A N-SECE interface circuit made of off-the-shelf discrete components has been realized in order to FoM N-SECE (this paper) Standard interface (SEH) [2] SECE [4][5][6][7] Tunable SECE [9][10] Phase-shift SECE [16] Our PEH ( The highly coupled PEH is composed of two 10×5×0.5 mm 3 single crystal PZN-PT plates deposited on a cantilever beam. This PEH characteristics are summarized in Table 2.…”

Section: Resultsmentioning

confidence: 99%

“…Considering the filtering effect of the mechanical resonator, it is reasonable to consider that only the first voltage harmonic > n will have an influence on the dynamics of the system. Its expression in the Fourier domain > n is given by (10).…”

Section: Theoretical Analysis: Multiple Sece (N>1 Case)mentioning

confidence: 99%

“…single crystal, piezoelectric harvesters may now exhibit much higher electromechanical coupling associated with low mechanical damping. For this particular kind of PEH, SECE strategy is not well adapted since it overdamps the mechanical resonator, leading to low displacements and harvested energy [7,8].Some research has been conducted to investigate new efficient strategies that could be used for highly coupled PEH, in order to optimize the damping induced by the electrical interface [8][9][10]. Indeed, in [8], we proposed to wait a certain number of semi-period before harvesting the accumulated energy in order to reduce the damping induced by the electrical interface.…”

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confidence: 99%

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A unified N-SECE strategy for highly coupled piezoelectric energy scavengers

Morel¹,

Badel²,

Wanderoild³

et al. 2018

Smart Mater. Struct.

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This paper proposes a novel vibration energy harvesting strategy based on an extension of the Synchronous Electric Charge Extraction (SECE) approach, enabling both the maximization of the harvested power and a consequent bandwidth enlargement in the case of highly coupled/lightly damped piezoelectric energy harvesters. The proposed strategy relies on the tuning of the frequency of the energy extraction events, which is either times greater than the vibration frequency (Multiple SECE case, > 1) or 1/ times smaller (Regenerative SECE, < 1). We first prove analytically than increasing or decreasing both lead to a damping reduction. While has no impact on the system's resonance frequency in the Regenerative case ( < 1), we show that this resonant frequency becomes a function of in the Multiple SECE case ( > 1). Experimental results on a highly coupled/lowly damped piezoelectric harvester ( ( = 0.44, / = 20) demonstrates the potential of this strategy, leading to 257% harvested power improvement compared to SECE ( = 1). and the possibility to tune the resonant frequency on a range as large as 35% of the short-circuit resonant frequency of the harvester.Thanks to recent progresses in the mechanical design and the use of highly coupled piezoelectric materials, e.g. single crystal, piezoelectric harvesters may now exhibit much higher electromechanical coupling associated with low mechanical damping. For this particular kind of PEH, SECE strategy is not well adapted since it overdamps the mechanical resonator, leading to low displacements and harvested energy [7,8].Some research has been conducted to investigate new efficient strategies that could be used for highly coupled PEH, in order to optimize the damping induced by the electrical interface [8][9][10]. Indeed, in [8], we proposed to wait a certain number of semi-period before harvesting the accumulated energy in order to reduce the damping induced by the electrical interface. In [9] and [10], the damping is reduced thanks to the control of the number of electrical charges extracted from the piezoelectric material. Those two approaches, even though they allowed to reduce the damping, did not induce any frequency tuning effect which could although be used to enlarge the harvesting bandwidth.Electrically-based frequency tuning strategies have also been proposed in the literature [11][12][13][14][15]. In [11], a capacitive bank combined with a variable resistive load emulated thanks to a DC/DC converter allows to tune the phase of the piezoelectric voltage while optimizing the damping induced by the interface. However, this approach requires an important number of passive components. In order to overcome this issue, in [12], we proposed to replace the capacitive bank with a short-circuit control which emulates a tunable capacitive behavior.[13] and [14-15] proposed a new frequency tuning approach based on the combination of the tunable SECE explained in [9] and [10] with a phase tuning. This approach is theoretically very efficient, however it introduces two tuning para...

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Section: Resultsmentioning

confidence: 99%

Section: Theoretical Analysis: Multiple Sece (N>1 Case)mentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

A unified N-SECE strategy for highly coupled piezoelectric energy scavengers

Morel¹,

Badel²,

Wanderoild³

et al. 2018

Smart Mater. Struct.

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“…The harvested energy is the energy stored in the piezoelectric material right before the harvesting process, which happens every /2 period. The harvested power can be expressed as a function of the displacement amplitude, as shown by (5).…”

Section: Expression Of the Harvested Powermentioning

confidence: 99%

“…However, for highly coupled or lowly damped generators, SECE is no longer efficient since it overdamps the mechanical system. For this very particular kind of harvester, researchers have started to find new strategies in order to optimize the damping induced by the electrical interface and even tune the resonant frequency of the whole electromechanical system, based on the electrical interface [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Regenerative synchronous electrical charge extraction for highly coupled piezoelectric generators

Morel

Pillonnet

Badel

2017

2017 IEEE 60th International Midwest Symposium on Circuits and Systems (MWSCAS)

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Abstract-This paper proposes a new strategy for vibration harvesting using piezoelectric material. This work relies on an adaptation of the classical Synchronous Electrical Charge Extraction (SECE). Instead of harvesting the energy at every displacement extremum, we choose to wait a certain number of extremum before harvesting the accumulated energy. This technique extends the harvested power compared to SECE, especially with highly coupled piezoelectric generators. It is notably shown that this strategy largely increases the harvested power as the product k m 2 Q m gets greater, and at the same time optimizes the switching losses. Measurements on a piezoelectric energy harvester (PEH) exhibiting a relatively large global coupling coefficient have been realized and have proven the efficiency and potential of this technique (193% harvested power improvement at resonance compared with a standard SECE strategy).

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Optimization of an SSHC-based full active rectifier for piezoelectric energy harvesting

Wassouf,

Jamshidpour,

Frick

2023

Analog Integr Circ Sig Process

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This paper presents a compact and efficient integrated interface circuit for piezoelectric energy harvesting. While the state-of-the-art interface circuits require the use of either an external inductor or a significant number of additional capacitors to achieve high voltage flip and improve power efficiency, the proposed Full Active Rectifier on Flipping Capacitor (FAR-FC) is based on a reduced set of flipping capacitors and an active rectifier to efficiently flip the voltage across the piezoelectric transducer. In addition, this optimized SSHC circuit reaches better power efficiency when the piezoelectric transducer is operating under low mechanical excitation, i.e. when the open-circuit voltage of the piezoelectric transducer is V oc = 1V , while this value is usually V oc ≥ 2V in literature. Furthermore, the FAR-FC supports piezoelectric transducers with higher inherent capacitance values compared to those usually reported in literature, which makes the circuit potentially suitable for a larger variety of MEMS applications. The interface circuit was designed and fabricated in a 0.35-µm CMOS process. Measurement results show that the voltage flip efficiency goes up to 90%. It also reveals that the proposed FAR-FC circuit achieves power performance up to 5.64× higher than a conventional full-bridge rectifier.

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Tunable interface for piezoelectric energy harvesting

Cited by 20 publications

References 5 publications

A unified N-SECE strategy for highly coupled piezoelectric energy scavengers

A unified N-SECE strategy for highly coupled piezoelectric energy scavengers

Regenerative synchronous electrical charge extraction for highly coupled piezoelectric generators

Optimization of an SSHC-based full active rectifier for piezoelectric energy harvesting

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