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Investigation to the influence of additional magnets positions on four-magnet bi-stable piezoelectric energy harvester

Li Xinxin, Huang Kexue, Li Zhilin, Xiang Jiangshu, Huang Zhenfeng, Mao Hanling, Cao Yadong

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2022

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Vol. 70, nr 1

art. no. e140151

EN

To enhance the harvesting performance of a bi-stable piezoelectric energy harvester (BEH), this work proposes a four-magnet BEH (FBEH). FBEH consists of a piezoelectric cantilever beam with a tip magnet, a fixed magnet and two movable magnets. The two movable magnets relative to the fixed magnet can move in both horizontal and vertical directions. A nonlinear distributed parameter model of FBEH is derived through the Hamilton principle. The effects of the excitation frequency and amplitude as well as the horizontal and vertical gap on the harvesting performance are mainly investigated by using the bifurcation diagram, phase diagram, Poincaré map and output power. Numerical simulations demonstrate that the proposed FBEH decreases the potential barrier and creates a higher than typical bi-stable one when subjected to lower excitation amplitudes and frequencies.

2

Experimental investigation on the piezoelectric energy harvester as a self-powered vibration sensor

Grzybek D., Micek P.

Journal of Theoretical and Applied Mechanics

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2018

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Vol. 56 nr 3

687--699

EN

The article presents an experimental study of a system consisting of a piezoelectric energy harvesting device, Graetz bridge rectiﬁer, capacitor, voltage comparator and radio transmitter. In the presented experimental study, the recovered electrical energy is accumulated in the capacitor and is used to send signals by a radio transmitter. In the ﬁrst part, the application of piezoelectric energy harvesting devices based on the cantilever beam in wireless monitoring systems is discussed. In the second part, the mathematical model of energy conversion in the piezoelectric energy harvesting devices is presented. In the third part, the characteristics obtained during laboratory research are presented.

3

Optimization analysis of interface circuits in piezoelectric energy harvesting systems

Pang S., Li W., Kan J.

Journal of Power Technologies

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2016

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Vol. 96, nr 1

1--7

EN

Piezoelectric energy harvesting systems have different interface circuits, including the standard interfacercuit, synchronized switch harvesting on inductor circuit, and synchronized charge extraction circuit. The comparison of an interface circuit with a different interface circuit to determine which is better has been widely investigated. However, for a certain interface circuit, how the parameters can be optimized to increase efficiency in energy collection has rarely been investigated. To improve the energy harvesting efficiency of a certain interface circuit in a fast and convenient manner, three interface circuits, which are the circuits to be optimized, were mainly introduced. A simulation method to optimize the circuit for energy collection was used. The simulation method was implemented in Pspice and includes parametric, sensitivity, and optimization analyses. The output power of parallel synchronized switch harvesting on the inductor circuit can be increased from 20.13 mW to 25.23 mW, and the output power of the synchronized charge extraction circuit can be increased from 11.98 mW to 19.85 mW. Results show that the energy collection performance can be improved by using the optimization simulation method.

4

Co-design of a low-power RF receiver and piezoelectric energy harvesting power supply for a Wireless Sensor Node

Mancelos N, Correia J, Oliveira J. P., Oliveira L. B.

International Journal of Microelectronics and Computer Science

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2014

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Vol. 5, nr 4

136--143

EN

A low-voltage RF CMOS receiver front-end and an energy harvesting power circuit for a piezoelectric source are presented as a co-designed solution for a Wireless Sensor Node. A MOSFET-only Wideband balun LNA with noise cancelling and a 0.6 V supply voltage is designed in conjunction with a passive mixer. The passive mixer operates in current mode, allowing a minimal introduction of voltage noise and a good linearity. The receiver front-end reaches a total voltage conversion gain of 31 dB, a 0.1-5.2 GHZ bandwidth, an IIP3 value of -1.35 dBm, and a noise ﬁgure inferior to 9 dB. The total power consumption is 1.95 mW. The energy harvesting power circuit consists of an active full bridge cross-coupled rectiﬁer followed by a low-dropout (LDO) regulator, and it is able to guarantee a power output of 6 mW with a regulated output voltage of 0.6 V, for typical vibration patterns.

5

Optimal Design of Piezoelectric Actuators for Shunt Damping Techniques

Neubauer M.

Archives of Acoustics

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2014

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Vol. 39, No. 4

615--622

EN

In vibration control with piezoceramics, a high coupling of the piezoelement with the structure is desired. A high coupling improves the damping performance of passive techniques like shunt damping. The coupling can be influenced by a the material properties of the piezoceramics, but also by the placement within the structure and the size of the transducer. Detailed knowlegde about the vibration behavior of the structure is required for this. This paper presents an in-depth analysis of the optimal shape of piezoelectric elements. General results for one-dimensional, but inhomogeneos strain distribution are provided. These results are applied to the case of a longitudinal transducer and a bending bimorph. It is obtained that for maximum coupling, only a certain fracture of the volume should be made of piezoelectric material. . .