Broadband piezoelectric energy harvesting system

Abstract

The invention discloses a broadband piezoelectric energy harvesting system comprising a main strut and piezoelectric bimorphs strings, wherein the main strut is positioned in the working environment of a microelectronic device; each piezoelectric bimorph string comprises a plurality of piezoelectric bimorphs connected in series; and the piezoelectric bimorphs have unequal lengths; and one end of each piezoelectric bimorph is suspended on the main strut, and the output ends of the piezoelectric bimorph strings are connected with the microelectronic device. As the working frequency band is wide, the broadband piezoelectric energy harvesting system can more effectively extract energy from a variable multi-frequency environmental vibration source to ensue the normal working of the microelectronic device. The broadband piezoelectric energy harvesting system can also move the position of the working frequency band by connecting with a plurality of piezoelectric bimorph strings in parallel and control the on-off of each piezoelectric bimorph string by adopting a control switch so as to vary the position of the working frequency band. Therefore, the system has stronger frequency adaptability and can adapt to the multi-frequency vibration source.

Description

technical field [0001] The invention relates to a power supply system for microelectronic devices, in particular to a system for supplying power to microelectronic devices by using vibration energy captured from the working environment of the microelectronic devices. Background technique [0002] In the context of the widespread application of microelectronic devices, the shortcomings of traditional portable battery power supply methods such as short service life, high quality-to-energy ratio, and sometimes difficult replacement due to environmental constraints make them unsuitable for modern networked sensing technology. Therefore, it is necessary to find a more effective energy supply method for microelectronic devices. It enables modern networked sensing technology to develop towards miniaturization and more integrated circuits, and has modern functions such as automatic calibration, wireless manipulation, and human-machine compatibility. [0003] At present, an effectiv...

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Problems solved by technology

[0004] However, most of the existing piezoelectric energy harvesters are fixed-frequency devices after they are produced, and the frequency of the environmental vibration source may change all the time. Not only that, the same environmental vibration source may also contain multiple vibration frequency spectra (see literature [2]), in addition, under the influence of various factors such as temperature, electromagnetic field, gravitational changes, etc., the frequency of the environmental vibration source may drift

For piezoelectric energy harvesters, once the frequency of the environmental vibration source deviates from the natural frequency of the piezoelectric energy harvesting structure of the piezoelectric energy harvester, the interaction between the energy harvesting structure and the multi-frequency environmental vibration source is very weak , its output power will be greatly reduced, and it is difficult to ensure the normal operation of microelectronic devices

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