Wearable piezoelectric electromagnetic composite energy harvesting vibration device

Abstract

The invention discloses a wearable piezoelectric electromagnetic composite energy harvesting vibration device. An adopted composite beam obtains larger stress distribution and a larger stress value, and a piezoelectric film is adopted as a piezoelectric material of the composite beam and larger deformation can be borne such that more electric energy is generated; a cylindrical permanent magnet isfixed at a tail end of the composite beam and can be used as a mass block such that the resonant frequency of the composite beam can be reduced, and the adaptability of the composite beam to a low-frequency environment is higher; the permanent magnet can also be used as an electromagnetic energy harvesting oscillator to generate an electromagnetic energy harvesting effect together with a coil; dueto the coupling effect of piezoelectricity and electromagnetism, the defects that the output current of a piezoelectric device is small and the output voltage of an electromagnetic device is small are overcome, the output voltage is high, and the current is large.

Description

technical field [0001] The invention relates to the field of energy collection, in particular to a wearable piezoelectric electromagnetic composite energy harvesting vibration device. Background technique [0002] In recent years, portable electronic devices, microelectromechanical systems (MEMS) and wireless sensor networks have been widely used in civil, military, medical and industrial production. Most of the current microelectronics are powered by chemical batteries. However, due to the problems of low energy density, regular replacement or charging, and environmental pollution, traditional batteries are difficult to meet the needs of the rapid development of microelectronics products. Harvesting energy from the environment to power microelectronics has become a promising technology that has drawn intense attention from researchers in the past few years. Around our living environment, there are all kinds of waste energy, such as solar energy, pressure energy, vibration...

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Problems solved by technology

[0005] The above-mentioned energy is converted through vibration. People need to exercise every day. During the exercise, vibration will be generated. Therefore, the vibration during the exercise can also be converted into energy. However, the equipment of the above-mentioned patent is mostly used in machinery or The equipment is bulky and cannot be applied to the human body

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