A Piezoelectric Energy Recovery Device Integrated with Adaptive Mechanical Switch

Abstract

The invention discloses a piezoelectric energy recovery device integrated with an adaptive mechanical switch. The device comprises a support base, clamps, a piezoelectric cantilever beam energy collector, an amplitude detection mechanism, a system interface circuit and an energy management unit, wherein the energy collector comprises a piezoelectric element, a cantilever beam and first masses; the amplitude detection mechanism comprises switch cantilever beams, light springs and second masses; the system interface circuit is connected with the piezoelectric element and the energy management unit through wires and connected with the first masses and contact points of the light springs through wires. SSHI (synchronized switch harvesting on inductor) technology is adopted, and defects that original electronic switches need to be controlled by additional electronic components and consume electric energy and mechanical switches cannot adapt to amplitude variation and automatically close atpositive and negative extremums of the amplitude are overcome; the device is simple and reliable in structure and has wide application prospect; energy recovery efficiency and average power of outputelectric energy are both higher than those of a common synchronous switch switching energy recovery device.

Description

Technical field [0001] The invention belongs to the field of piezoelectric energy recovery, and particularly relates to a piezoelectric energy recovery device integrated with an adaptive mechanical switch. Background technique [0002] Wireless sensors have been developing rapidly under the efforts of a large number of researchers, and have been widely used in medical and health, structural monitoring and diagnosis, industrial and agricultural production, and intelligent transportation. At present, most wireless sensors are powered by batteries. Considering the maintenance cost of battery replacement and many applications where the battery cannot be replaced, their service life is largely restricted by the energy provided by the battery, which seriously affects the wireless The reliability and economy of sensor networks. [0003] Energy recovery, that is, the recovery of solar energy, thermal energy, electromagnetic radiation energy, vibration mechanical energy, etc. from the envi...

AI Technical Summary

Problems solved by technology

On the one hand, this brings additional cost and increased complexity; on the other hand, in some specific occasions with low power consumption and complex electromagnetic environment, the application is limited

[0005] At present, there are mainly two types of synchronous switches, electronic switches and mechanical switches. The electronic switch detects the positive and negative extreme points of the displacement amplitude of the piezoelectric element through the circuit, and then controls the electronic switch to open, but because the control circuit itself consumes part of the energy, it will reduce the collection efficiency

Existing mechanical switches have great limitations, while ordinary mechanical switches have a narrow range of adaptation, cannot adapt to amplitude changes and automatically close at the positive and negative extremes of the amplitude, and the switching time is delayed or advanced, and the acquisition efficiency is not high

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