A low frequency piezoelectric power harvester using a spiral-shaped bimorph

Hu, Yuantai; Hu, Hongping; Yang, Jiashi

doi:10.1007/s11433-006-2021-z

Cited by 43 publications

(27 citation statements)

References 15 publications

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“…To harvest vibration energy from a low-frequency source, a ceramic spiral generator was proposed in ref. [213] with an approximate analysis treating the spiral as a series of semicircles of different radii. Two exact analyses of generators operating with TT modes in PZT plates [214] and TSh modes in circular cylindrical PZT shells [215] were obtained, which are relatively rare.…”

Section: Generatorsmentioning

confidence: 99%

Analytical and numerical modeling of resonant piezoelectric devices in China-A review

Yang

2008

Sci. China Ser. G-Phys. Mech. Astron.

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The results on theoretical and numerical modeling of resonant piezoelectric devices in China are reviewed. Solutions to dynamic problems of the propagation of bulk acoustic waves (BAW), surface acoustic waves (SAW), vibrations of finite bodies, and analyses of specific devices are discussed. Results from both the ultrasonics community and mechanics researchers are included. It is hoped that the paper will be useful for the understanding, communication and collaboration between Chinese and foreign scholars. The paper may also be helpful for bridging the gap between ultrasonics and mechanics researchers on piezoelectricity research. The paper contains 316 references.

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Section: Generatorsmentioning

confidence: 99%

Analytical and numerical modeling of resonant piezoelectric devices in China-A review

Yang

2008

Sci. China Ser. G-Phys. Mech. Astron.

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“…Their work shows that the overall performance of a piezoelectric energy harvester strongly depends upon the interaction between the harvester structure and the storage circuit, although they have simply simulated the storage circuit as single impedance. This research has been further extended to those energy harvesters with piezoelectric spiral-belt bimorphs as the harvesting structures [32] . The nonlinearity of a piezoelectric plate harvester vibrating in thicknessshear mode is analyzed in detail in the literature [33].…”

Section: Introductionmentioning

confidence: 99%

“…In addition to the rectification's nonlinearity, of the features distinguishing the present model from the existing models is the fact that this system is of multiple time-scales, because a modulating circuit has its own intrinsic time scale related to the circuit oscillation frequency, and of course, a harvesting structure has its intrinsic time scale determined by its vibration resonance, compared with the frequency of the ambient acoustics/vibrations. It is these three time scales that together determine how the modulating circuit performs its switching on/off function for efficient charging [35][36][37][38][39][40][41][42] . It should be noted that the effect of the storage circuit on the harvesting structure is totally determined by the operating status of the rectifier.…”

Section: Introductionmentioning

confidence: 99%

Coupled analysis for the harvesting structure and the modulating circuit in a piezoelectric bimorph energy harvester

Jiang

2007

Acta Mech. Solida Sin.

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The authors analyze a piezoelectric energy harvester as an electro-mechanically coupled system. The energy harvester consists of a piezoelectric bimorph with a concentrated mass attached at one end, called the harvesting structure, an electric circuit for energy storage, and a rectifier that converts the AC output of the harvesting structure into a DC input for the storage circuit. The piezoelectric bimorph is assumed to be driven into flexural vibration by an ambient acoustic source to convert the mechanical energies into electric energies. The analysis indicates that the performance of this harvester, measured by the power density, is characterized by three important non-dimensional parameters, i.e., the non-dimensional inductance of the storage circuit, the non-dimensional aspect ratio (length/thickness) and the non-dimensional end mass of the harvesting structure. The numerical results show that: (1) the power density can be optimized by varying the non-dimensional inductance for each fixed non-dimensional aspect ratio with a fixed non-dimensional end mass; and (2) for a fixed non-dimensional inductance, the power density is maximized if the non-dimensional aspect ratio and the non-dimensional end mass are so chosen that the harvesting structure, consisting of both the piezoelectric bimorph and the end mass attached, resonates at the frequency of the ambient acoustic source.

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“…In their analyses, the remaining part of an energy harvester except the harvesting structure is simplified as an impedance, and the two principal components are integrated as a whole system through the generalized Ohm law. This research has been further extended to those energy harvesters with piezoelectric spiral-belt bimorphs as the harvesting structures [13] . The nonlinearity of a piezoelectric plate harvester vibrating in thickness-shear mode is analyzed in detail by Hu et al [14] .…”

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confidence: 99%

An improved piezoelectric harvester available in scavenging-energy from the operating environment with either weaker or stronger vibration levels

Xue

et al. 2009

Sci. China Ser. G-Phys. Mech. Astron.

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An improved harvester available in scavenging energy from the operating environment with either weaker or stronger vibration levels is studied. To ensure the optimal harvester performance, a Cuk dc-dc converter is employed into the modulating circuit. This paper reports how this harvester scavenges maximal energy from varying-level vibrations and store energy into an electrochemical battery. Dependence of the duty cycle upon the external vibration level is calculated, and it is found that: 1) for weaker vibrations, the charging current into the battery is smaller than the allowable current, and thus all the optimal output power of the harvesting structure can be absorbed by the battery. In this case, the duty cycle should be fixed at 1.86%; 2) for stronger external forcing, the allowable charging current of the battery is smaller than the optimal harvested current. This indicates that just a portion of the scavenged energy can be accepted by the battery. Thus, the duty cycle should be decreased gradually with the increase of the vibration level. Finally the energy transmission process and the roles of each electronic element are analyzed. It is shown that a Cuk converter can greatly raise the efficiency of such a harvester, particularly when subjected to a weaker ambient vibration.piezoelectric harvester, scavenging energy, Cuk converter, duty cycle Due to the rapid development of micro-electronic devices and micro-sensors ranging from civil, medical to military applications, the past few years have witnessed an increasing focus on how to power these kinds of small and/or wireless devices to keep them operate whenever necessary. Conventionally, such micro-electronic devices are powered by bulky batteries with a short service life. However, battery replacement is often difficult in certain applications, such as unattended sensors. Furthermore, the mass to electrical power ratio of a conventional battery is often too high for many applications. One alternative is directly scavenging energy from the operating environment [1 -3] . Roundy et al. [4,5] reviewed a lot of methods for energy harvesting, by comparing the computational result and the experimental data, they indicated that the piezoelectric generators were very promising, because of the significantly higher efficiency. In general, a piezoelectric energy harvester consists of three major components: (1) a piezoelectric harvesting structure for scavenging attainable energy form ambient energy source, such as ambient acoustics/vibrations, and converting it into electric energy as the form of alternating current; (2) an energy storage device, typically an electrochemical battery; (3) a modulating circuit that converts the generated ac current into a dc current for charging the rechargeable battery effectively, matches the rectified voltage with the battery voltage and switches the charging current on and off to increase the charging efficiency.Cho et al. [6] and Ha [7] paid their attention primarily on optimizing the harvesting structure using equivalent

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A low frequency piezoelectric power harvester using a spiral-shaped bimorph

Cited by 43 publications

References 15 publications

Analytical and numerical modeling of resonant piezoelectric devices in China-A review

Analytical and numerical modeling of resonant piezoelectric devices in China-A review

Coupled analysis for the harvesting structure and the modulating circuit in a piezoelectric bimorph energy harvester

An improved piezoelectric harvester available in scavenging-energy from the operating environment with either weaker or stronger vibration levels

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