Y-type composite vibration generator

Abstract

The invention discloses a Y-type composite vibration generator which comprises 2 frames with the same shape, 1 cantilever beam, 2 permanent magnets, 2 coils and at least 1 piezoelectric piece, wherein each frame is integrally formed by three sections from left to right: a left horizontal part, an inclined plane part and a right horizontal part; the upper surface of a fixed end of the cantilever beam is in contact with the inner surface of the left horizontal part of one frame, and the lower surface is in contact with the inner surface of the left horizontal part of the other frame; the 2 permanent magnets are stuck on the upper and lower surfaces of a free end of the cantilever beam respectively and correspond to the right horizontal parts of the upper and lower frames respectively; the 2 coils are arranged on the outer surfaces of the right horizontal parts of the upper and lower frames respectively and correspond to the upper and lower permanent magnets respectively; and the piezoelectric piece is stuck on the outer surfaces of the inclined plane parts of the upper and lower frames. In the structure, a piezoelectric element and an electromagnetic element working in a stretching/compression mode are integrated at different parts of the same generator, thus the utilization rate of high vibration energy is increased, and the power generation capacity and the output power density of the generator are improved.

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 Y-type compound vibration generator utilizing piezoelectric elements and electromagnetic elements. Background technique [0002] The reduction of CMOS circuit size and power consumption, especially the development of ultra-low power electronics, has greatly promoted the research of wireless sensors, implantable electronic systems, wearable electronic systems, portable electronic systems, etc. These systems are portable or distributed and therefore require their own power supply. However, the harsh working conditions of these microelectronic products make it difficult for traditional power supply methods such as batteries and wired power supplies to meet their special needs for power supplies. For example, on the one hand, the system may shut down at any time because it is impossible to determine exactly when to replace the...

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Problems solved by technology

Chinese patent application number 201110141901.9 proposes a miniature composite vibration generator, which uses a d31 piezoelectric cantilever beam and electromagnetic as an energy harvesting element, and has the characteristics of simple structure, small size, low cost, and high energy conversion density of the cantilever beam. However, this generator does not make full use of every part to install piezoelectric sheets. Under certain external environment conditions, if the generator needs to increase the output power, it only needs to increase the number of piezoelectric sheets on the cantilever beam, resulting in an increase in volume. Large, the power density does not increase substantially

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