Multi-direction piezoelectric energy collecting device and collecting method thereof

Abstract

The invention provides a multi-direction piezoelectric energy collecting device and a collecting method thereof. The device comprises an upper cover, a curved beam, a middle beam, a mass block and a base. The upper portion and the lower portion of the curved beam are fixedly connected with the upper cover and the base respectively, a first containing cavity is formed in the upper cover, a second containing cavity is formed in the base, and the first containing cavity is communicated with the second containing cavity to form a containing space. The middle of the curved beam is fixedly connected with the top of the middle beam, and the lower portion of the middle beam is fixedly connected with the mass block. The curved beam consists of a plurality of sub-beams, and a piezoelectric plate is also arranged on the surface of the curved beam; The mass block generates inertia force under the action of multi-direction vibration acceleration emitted by a vibration source, and the inertia force is converted into torque through the middle beam and is transmitted to the curved beam, so that the sub-beams are subjected to torsion-bending deformation in the containing space, then the piezoelectric plate is deformed, and the environment vibration energy is converted into the electric energy. The device is compact in structure, small in size and wide in frequency band, and the multi-directional vibration mechanical energy in the external environment can be converted into the electric energy through a single energy conversion device.

Description

technical field [0001] The present invention relates to the technical field of energy collection, in particular to a multi-directional piezoelectric energy collection device and a collection method thereof. Background technique [0002] In daily life, there are many systems or devices that generate vibrations of different frequencies, such as: people walking, vibrations when engines are moving, etc. These vibrations have energy and have a high energy density. Therefore, the energy harvesting technology that converts vibration kinetic energy into electrical energy has a wide range of energy sources and applications. [0003] In recent years, microelectromechanical systems (MEMS) and wireless sensor networks (WSN) have been developed rapidly, especially in military, transportation, medical and other fields have been widely used. More and more electronic products have benefited from the development of MEMS technology, and their size and power consumption have become smaller an...

AI Technical Summary

Problems solved by technology

In summary, most of the piezoelectric vibration energy harvesting devices can only achieve effective collection of vibration energy in one vibration direction. When there are vibrations in multiple directions, or when the vibration direction changes randomly, such piezoelectric vibration energy The collection efficiency of the collection device is low, and in the actual environment, the vibration direction is usually unknown and variable

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