Low Vibration Threshold Monitoring Secondary Energy Harvester Based on Ferromagnetic Cantilever Beam

Abstract

The invention provides a ferromagnetic cantilever beam-based secondary energy acquisition device capable of monitoring a low-vibration threshold. The secondary energy acquisition device comprises a fixed rack, a first-stage low-frequency oscillator and a second-stage high-frequency oscillator, wherein first-stage low-frequency oscillator and the second-stage high-frequency oscillator are fixed inthe fixed rack, the first-stage low-frequency oscillator comprises a first cantilever beam, a permanent magnet and a mass block, a first end of the first cantilever beam is fixed at one side of the fixed rack, a second end of the first cantilever beam is a free end, the permanent magnet is arranged on a first surface of the second end of the first cantilever beam, the mass block is arranged on a second surface of the second end of the cantilever beam or an upper surface of the permanent magnet, the second-stage high-frequency oscillator comprises a second cantilever beam and a piezoelectric thin film, a first end of the second cantilever beam is fixed at the other side of the fixed rack, a second end of the second cantilever beam is a free end, the piezoelectric thin film is arranged on afirst surface of the second cantilever beam, the first cantilever beam and the second cantilever beam are ferromagnetic cantilever beams, and preset distance is arranged between the second end of thefirst cantilever beam and the second end of the second cantilever beam. By the secondary energy acquisition device, the problems of single function, small inductance, small amplitude, low accelerationand low vibration efficiency of the secondary energy acquisition device in the prior art are solved.

Description

technical field [0001] The invention belongs to the field of micromechanical sensors, in particular to a low-vibration threshold monitoring secondary energy harvester based on ferromagnetic cantilever beams. Background technique [0002] At present, with the development of the Internet of Things technology, more and more electronic devices are connected to the network. Wireless sensor nodes have the advantages of convenient deployment (portability) and independent work, and are widely used in wearable consumer electronics, building health monitoring, and smart cities to obtain key monitoring information or massive data. [0003] A wireless sensor node usually includes a power module, a controller module (MCU), a sensor module, and a wireless communication module. In these modules, the controller module and the sensor module need to work frequently in order to reduce the possibility of missing monitoring information and improve the reliability of the node. Reliability, which...

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Problems solved by technology

[0007] In view of the shortcomings of the prior art described above, the object of the present invention is to provide a low vibration threshold monitoring secondary energy harvester based on a ferromagnetic cantilever beam, which is used to solve the problem of single function of the secondary energy harvester in the prior art, and Induction of small amplitude, low acceleration vibration and low efficiency

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