Piezoelectric energy harvester and its harvesting circuit applied to road speed bumps

Abstract

The invention discloses a piezoelectric energy collector applied to a road deceleration strip and a collection circuit of the piezoelectric energy collector, and aims at solving the technical problem of low collection efficiency of an existing piezoelectric energy collector. According to the technical scheme, an impact-type cantilever beam structure is adopted by the collector; when a vehicle drives on the deceleration strip, mechanical energy of the vehicle is converted into electric energy through a piezoelectric material in the collector; and after the vehicle drives off the deceleration strip, a cantilever beam is in a free vibration state with damping and the mechanical vibration is further converted into the electric energy by the piezoelectric material, so that continuous output of the electric energy is achieved. By the matched collection circuit, input impedance can be matched with the impedance of the piezoelectric material during the period of shock and the period of free vibration separately through controlling and changing the switching period and the duty ratio of a DC-DC switching converter, so that electric energy output by the piezoelectric material is maximized. Furthermore, when no electric energy is generated, a piezoelectric energy collection circuit enters a sleep mode with extremely low power consumption, so that the energy is saved and the collection efficiency of the collection system is significantly improved.

Description

technical field [0001] The invention relates to a piezoelectric energy harvester, in particular to a piezoelectric energy harvester applied to road speed bumps. It also relates to the collection circuit for the piezoelectric energy harvester applied to road speed bumps. Background technique [0002] With the rapid development of science and technology, the quality of human life has been continuously improved. At the same time, the energy crisis and the deterioration of the earth's ecological environment are intensifying day by day, and energy conservation, emission reduction and renewable energy have become global hot topics today. Piezoelectric materials can convert mechanical energy into electrical energy, providing an effective way to generate green and environmentally friendly renewable energy. At present, the number of cars in the world continues to increase, and cars not only consume a lot of fossil energy, but also cause serious air pollution. Collecting the kineti...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the deficiency of low collection efficiency of existing piezoelectric energy harvesters, the present invention provides a piezoelectric energy harvester and its collection circuit applied to road speed bumps

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