Magnet-free bistable piezoelectric transducer

Abstract

The invention relates to a magnet-free bistable piezoelectric transducer which comprises a piezoelectric transduction unit, a fixture and a transmission unit. The piezoelectric transduction unit is made of piezoelectric materials; the piezoelectric transduction unit is clamped by the fixture, the fixture provides axial compressive force to the piezoelectric transduction unit, and the axial size of the piezoelectric transduction unit is larger than the distance between two clamp arms of the fixture; the transmission unit is used for outputting electric energy generated when the piezoelectric transduction unit deforms, and electric energy from an external power source can be inputted into the piezoelectric transduction unit by the transmission unit. The magnet-free bistable piezoelectric transducer has the advantages that the magnet-free bistable piezoelectric transducer not only can be used for collecting vibration energy, but also can be used as a driver to realize electric driving and on-off control functions.

Description

technical field [0001] The invention belongs to the technical field of piezoelectric materials and devices and new energy sources, and in particular relates to a magnet-free bistable piezoelectric transducer, which can generate electricity by using the vibration energy of the environment, and can also be used in Under the drive of the electric field, it vibrates in large amplitude to realize functions such as switching and driving. Background technique [0002] A piezoelectric material is a functional material that can generate an electric field under mechanical stress. This effect of generating an electric field under mechanical stress is called the piezoelectric effect. In addition, piezoelectric materials also have the inverse piezoelectric effect, that is, the characteristic of generating mechanical stress or mechanical strain under the action of an electric field. According to the standard issued by the Institute of Electrical and Electronics Engineers (IEEE Standard 1...

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Problems solved by technology

However, at present, the realization of the bistable structure requires the interaction of magnets to realize the jump between energy states. In the process of vibration energy collection, the magnet is not only susceptible to the influence of the surrounding magnetic field, but also the magnetic field generated by itself will also affect the nearby electrons. device, which contradicts the property that piezoelectric energy harvesters are immune to electromagnetic interference

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