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Adaptive active piezoelectric energy acquisition device

A technology of piezoelectric energy and harvesting devices, applied in piezoelectric effect/electrostrictive or magnetostrictive motors, electrical components, generators/motors, etc., can solve the problem of low energy harvesting power

Inactive Publication Date: 2014-12-17
HENAN UNIV OF SCI & TECH
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  • Abstract
  • Description
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Problems solved by technology

[0007] The purpose of the present invention is to provide an adaptive active piezoelectric energy harvesting device to solve the problem of low energy harvesting power in traditional technology at non-resonant frequencies

Method used

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  • Adaptive active piezoelectric energy acquisition device
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  • Adaptive active piezoelectric energy acquisition device

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Embodiment Construction

[0069] The present invention will be further described in detail below in conjunction with the drawings.

[0070] Such as figure 1 The shown adaptive active piezoelectric energy harvesting device consists of a main circuit and its control unit. Similar to the prior art, the main circuit of the present invention includes a piezoelectric device for converting vibration energy from an external excitation force into electrical energy. The piezoelectric element is connected to a full-bridge rectifier unit composed of a diode through the output of the inductor L1. The DC side of the full-bridge rectifier unit is connected to an energy storage unit through a DC / DC unit output, the full-bridge rectifier unit and the DC / DC unit There is also a charging capacitor C1 between.

[0071] The main invention of the present invention is that a switching tube Q1-Q4 is connected in parallel to each diode of the full-bridge rectifier unit, and the DC / DC unit is set as a Buck circuit, and the switchin...

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Abstract

The invention relates to an adaptive active piezoelectric energy acquisition device, which consists of a main circuit and a control unit thereof. A switching tube is connected in parallel with each diode of a full-bridge rectification unit. A direct current unit is a Buck circuit, and a switching tube of the Buck circuit is connected to the positive pole end of a charging capacitor. A current acquirer is arranged on the alternating current side of the full-bridge rectification unit. A power acquirer is arranged at the output end of the Buck circuit. An acceleration sensor for acquiring the frequency of external exciting force is also arranged in the main circuit. In order to adaptively obtain optimal control voltage, a power acquisition unit of a singlechip acquires an output power value in real time, and the optimal control voltage is adaptively regulated, so that the device works in a resonant state to maximally obtain mechanical energy, a damping period is shortened, the conversion power of the mechanical energy is improved, and impedance matching in realized in an electric energy transmission process to realize electric energy power output. When a system vibrates at frequency greatly deviated from fixed frequency, the energy acquisition power of the system cannot be greatly reduced.

Description

Technical field [0001] The invention relates to piezoelectric energy harvesting, that is, to the technical field of converting environmental vibration energy into electrical energy, in particular to an adaptive active piezoelectric energy harvesting device. Background technique [0002] In recent years, with the continuous improvement of micro-electromechanical systems, wireless sensor networks and embedded system preparation technology, traditional chemical batteries can no longer meet people's needs, and people have begun to study the conversion of energy in the surrounding environment into electrical energy. It can effectively solve the problems of pollution, energy consumption and maintenance caused by the use of batteries, greatly reduce costs and improve people's living environment. [0003] Piezoelectric energy harvesting devices have the advantages of simple structure, no electromagnetic interference, easy processing and production, and realization of structural miniaturiza...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02N2/18
Inventor 郑国强张利伟李济顺张前进沈森梁钊李佩佩付磊李敏
Owner HENAN UNIV OF SCI & TECH
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