Minitype composite vibration power generator

Abstract

The invention discloses a minitype composite vibration power generator belonging to the field of minitype power technology and energy-saving technology. The minitype composite vibration power generator is a cantilever beam vibration power generator compounded by piezoelectricity and electromagnetism and mainly comprises an insulating shell, a piezoelectric cantilever beam, a permanent magnet and an inductance coil, wherein the piezoelectric cantilever beam consists of a piezoelectric sheet and a supporting substrate; the piezoelectric sheet is bonded on the supporting substrate; one end of the supporting substrate is fixed on the insulating shell; the permanent magnet is bonded with a free end of the piezoelectric cantilever beam; and an inductance coil is arranged right above the permanent magnet. Under the resonant state, the power generator synchronously outputs the piezoelectric current and the electromagnetic current; the output power is improved within the finite volume; furthermore, by adopting the structure of dispersing mass blocks, the energy collecting density is improved, and the working frequency scope is enlarged simultaneously.

Description

technical field [0001] The invention belongs to the field of micro-power supply technology and energy-saving technology, and in particular relates to a micro-composite vibration generator. Background technique [0002] Wireless and portable miniature electronic products, because of their extremely low energy consumption, can be widely distributed in places with harsh environmental conditions and inaccessible to humans, or can be implanted inside the object to be measured, have promoted medical implantation, embedded Sensors, wireless sensor networks and other high-tech rapid development. However, the harsh working conditions of microelectronic products make it difficult for traditional power supply methods such as batteries and wired power supplies to meet their special requirements for power supplies. For example, various medical implants and structure-embedded microsensors require the system to be free from the shackles of the power cord; traditional batteries have shortc...

AI Technical Summary

Problems solved by technology

The generator is easy to integrate with other MEMS devices. However, the capacitor needs to be polarized under the action of an external electric field when it starts to work. To some extent, it is still limited by the working environment, which hinders its further development and application.

Chinese patents 200910080541.9 and 201010245136.6 invented the electromagnetic vibration generator, which overcomes the shortcomings of the capacitor generator that needs an external voltage to start working. However, due to its complex structure and the separation of the coil and the magnet, it is difficult to miniaturize

Chinese patent 200520051980.4 uses helical double piezoelectric ceramics as power generation elements, which are characterized by small size, miniaturization, good stability, and effective reduction of the natural frequency of the structure. However, due to the small area of ​​the helical double piezoelectric ceramics , so the amount of charge collected is small and the power generation is low

However, when the ambient frequency does not match the natural frequency of the generator, the collection efficiency of the piezoelectric cantilever drops sharply, and its carrying capacity is small, resulting in low conversion energy density

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