Broadband vibration energy recovery device based on piezoelectric materials

Abstract

The invention discloses a broadband vibration energy recovery device based on piezoelectric materials. The broadband vibration energy recovery device comprises an amplitude limit cantilever beam electromechanical coupling unit, an energy extracting unit and a power management unit. The amplitude limit cantilever beam electromechanical coupling unit comprises a cantilever beam and an amplitude limit device, the energy extracting unit comprises a flyback transformer and three diodes, and the output end of the power management unit is connected with external electronic equipment. According to the broadband vibration energy recovery device based on the piezoelectric materials, the amplitude limit device is in a special design, nonlinear force, acting on the beam, of the amplitude limit device can broaden the amplitude frequency response curve of a structure and enables the amplitude frequency response curve to be fit for vibration energy on the condition of broadband recovery, and the amplitude limit device can also protect a piezoelectric element against damage caused by large deformation under impulse load. The broadband vibration energy recovery device based on the piezoelectric materials can be widely applied to wireless sensor network nodes with self-sufficient energy, semi-active vibration control systems with self-sufficient energy and other electronic modules which have micro power consumption and can work independently.

Description

technical field [0001] The invention relates to an energy recovery device, in particular to an energy recovery device based on piezoelectric materials, belonging to the field of vibration energy collection. [0002] Background technique [0003] The wireless sensor network can directly learn the physical information of the objective world, link them with the remote control terminal through network transmission, and provide people with the most direct, effective and real objective information. Nowadays, with the tremendous progress of technologies such as sensors, microprocessors, and wireless communications, wireless sensor networks have also developed rapidly. However, as one of the basic technologies of wireless sensor networks, independent power supply technology has seriously restricted the further application of wireless sensor networks due to long-term lack of attention. At present, the vast majority of network nodes still use battery-powered technology, which leads ...

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Problems solved by technology

However, the switch control strategy of this technology is more complicated to implement, and the practicability is not strong.

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