Miniature piezoelectric type energy collector based on low-frequency ambient vibration driving

Abstract

Provided is a miniature piezoelectric type energy collector based on low-frequency ambient vibration driving. The miniature piezoelectric type energy collector based on low-frequency ambient vibration driving comprises a base, a cantilever beam, a mass block and an energy storage circuit, wherein the cantilever beam comprises a plurality of straight arm beams which are parallel to one another, every two adjacent straight arm beams are connected through a connecting piece so that the whole cantilever beam with a head end and a tail end can be formed, the head end is fixed to the base, the mass block is installed at the tail end, only one connecting piece is arranged between every two connected straight arm beams, and all the straight arm beams and the connecting pieces are arranged on the same plane; the energy storage circuit comprises a first bridge rectifier diode D1, a second bridge rectifier diode D2, a third bridge rectifier diode D3, a fourth bridge rectifier diode D4, a storage electrolytic capacitor C with the filtering function, and a load resistor RL. The miniature piezoelectric type energy collector based on low-frequency ambient vibration driving has the advantages that the length of the cantilever beam is increased in an equivalent mode, miniaturization of a device is achieved, the natural vibration frequency of the device is reduced, and output power is improved.

Description

technical field [0001] The invention relates to a miniature piezoelectric energy harvester driven by low-frequency environmental vibrations. Background technique [0002] Wireless sensor network is regarded as an important method to continuously collect data in various application environments. When the sensor nodes are widely distributed and the number is huge, one of the difficulties is how to supply power to the sensor nodes. Many applications require sensor nodes to be smaller than a dime and powered by button batteries, but the limited energy of batteries limits the stability, service life and application range of wireless sensor networks. Current solutions to this problem include energy-efficient algorithms and protocols, and ambient energy harvesting. Energy-saving protocols at all levels of wireless sensor networks can only prolong the life of sensor networks to a certain extent, but cannot fundamentally solve the problem of limited energy. By exploring the potenti...

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Problems solved by technology

[0004] In order to solve the problem that the current existing energy harvesters cannot form resonance with external vibrations, the output power is generally only in the order of microwatts, and cannot provide the power required for the normal operation of wireless sensor network nodes. The low-frequency vibration driving source that exists in the energy harvester that generates resonance, increases its output power, and meets the power supply voltage required for the normal operation of wireless sensor network nodes. A micro piezoelectric energy harvester driven by low-frequency environmental vibrations

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