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Piezoelectric energy trapping device capable of efficient trapping energy and energy-storaging

A technology of piezoelectric energy harvesting and energy harvesting devices, which is applied in the direction of current collectors, piezoelectric/electrostrictive/magnetostrictive devices, circuits, etc., and can solve problems such as the inability to guarantee the normal operation of microelectronic devices and the lack of energy storage functions , to achieve the effect of improving energy harvesting efficiency and charging efficiency

Inactive Publication Date: 2006-10-18
CENT SOUTH UNIV
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Problems solved by technology

Since microelectronic devices do not necessarily consume energy all the time, they only consume energy when they need to be started, and the energy consumed by the device during each start-up is not necessarily equal to the energy extracted from the environment during the same period, and the current Piezoelectric energy harvesters have no energy storage function. When the vibration level of the environment is low, this type of energy harvester cannot guarantee the normal operation of microelectronic devices.

Method used

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  • Piezoelectric energy trapping device capable of efficient trapping energy and energy-storaging
  • Piezoelectric energy trapping device capable of efficient trapping energy and energy-storaging
  • Piezoelectric energy trapping device capable of efficient trapping energy and energy-storaging

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Embodiment Construction

[0029] Such as figure 1 As shown, the energy harvesting element is composed of beam-shaped double piezoelectric ceramic sheets. The piezoelectric beam is composed of a double-layer piezoelectric ceramic sheet 1 and an interlayer 2 polarized along the thickness direction. The upper and lower layers of the double-layer piezoelectric ceramic sheet 1 The lower surface is plated with metal silver as the electrode 3, and the left end point 4 is fixed on the vibrating table, and the vibrating table is made of Asin2πf 0 t vertical vibration, A is the mechanical vibration amplitude, f 0 =1 / T 0 is the external frequency. A concentrated mass 5 is suspended at the outer end point. An inductance coil 7 with a control switch 6 is connected in parallel to the piezoelectric beam. The electrodes are then connected with a bridge rectifier 8 and a rectification capacitor 9 . Immediately following 9 is a Cuk type dc-dc converter, which consists of a transistor switch 10, an inductor 11, and ...

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Abstract

A piezoelectric energy captor enabling to capture energy and store energy effectively consists of piezoelectric beam formed by two layers of piezoelectric ceramic plates and intermediate sandwich layer, electrode prepared by plating metal silver on ceramic plate, inductance coil with control switch, bridge type of rectifier, rectifying capacitor, Cuk type of dc-dc converter formed by transistor switch and electric inductance as well as diode, filtering capacitor for stabilizing charge current, and energy storing battery.

Description

[technical field] [0001] The invention belongs to a piezoelectric energy harvester capable of capturing energy from environmental vibrations and effectively storing the captured energy in a rechargeable battery. [Background technique] [0002] Microelectronic devices need energy to work, and the traditional method is to provide energy by carrying batteries. Due to the short service life of the battery, high quality-to-energy ratio, and sometimes difficult replacement due to environmental constraints, it is not suitable for application in modern networked sensing technology. Finding new and more effective energy supply methods is the key technology for modern sensing technology to be more miniaturized, more integrated, and have more modern functions such as automatic calibration, wireless manipulation, and human-machine compatibility. [0003] Noise or mechanical vibrations are common in the working environment of microelectronic devices. Since the energy consumption of such...

Claims

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Application Information

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IPC IPC(8): H02J7/00H01L41/113H02J7/34H02N2/18
Inventor 胡元太薛欢胡洪平蒋树农
Owner CENT SOUTH UNIV
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