Piezoelectric electromagnetic vibration power generation device

Abstract

The invention discloses a piezoelectric electromagnetic vibration power generation device, and the device comprises a bistable piezoelectric cantilever beam, an electro-magnetic structure and an accessory structure. One end of the bistable piezoelectric cantilever beam is fixed, and a piezoelectric layer is pasted at the root of a basic layer. Lead wires are respectively led out of the upper surface of the piezoelectric layer and the surface of the basic layer. The piezoelectric cantilever beam vibrates under the action of environment vibration excitation to generate a voltage. A magnet II makes vertical reciprocating motion in a coil, and generates a variable magnetic field around the coil, thereby generating an induction voltage in the coil. The magnet II makes vertical reciprocating motion to drive a magnet I to move, enables the piezoelectric cantilever beam to make complex movement under the joint action of the environment vibration excitation and a magnetic force, and generates bigger electric energy. The movement of the magnet I drives the magnet II to move, thereby greatly improving the electromagnetic power generation efficiency. The device effectively combines the bistable piezoelectric power generation and electromagnetic power generation for complementation, thereby greatly improving the overall electro-mechanical conversion efficiency of a system, and greatly improving the power generation capability of the system.

Description

technical field [0001] The invention relates to a piezoelectric electromagnetic vibration power generation device, which can effectively combine piezoelectric power generation and electromagnetic power generation, and belongs to the field of green regeneration and environmental protection new energy. Background technique [0002] With the rapid development of microelectronics and wireless networks, it has become an urgent need to capture energy from the environment to power low-power devices or power batteries; traditional battery power supply has a series of disadvantages, such as short life, regular replacement, pollution environment, etc.; converting mechanical energy in the form of vibration in nature into electrical energy can not only avoid the disadvantages of traditional batteries, but also provide power for low-power appliances; electromagnetic power generation is to generate electrical energy by cutting magnetic induction lines with wires, combining electromagnetic ...

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Problems solved by technology

US patent (publication number WO2010151738A3) discloses a bistable piezoelectric cantilever beam power generation device, which effectively widens the resonance frequency band of the cantilever beam, but the degree of bandwidth expansion is not very large

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