Piezoelectric energy recovery device for recovering vibrational energy

Abstract

The invention discloses a piezoelectric energy recovery device for recovering vibrational energy, which comprises an energy recovery unit, a system interface circuit unit and an energy storage unit, wherein the energy recovery unit comprises a piezoelectric energy unit and a piezoelectric sensing unit, the piezoelectric energy unit comprises at least one first piezoelectric element adhered to the structural surface, the piezoelectric sensing unit comprises at least one second piezoelectric element adhered to the structural surface, and the system interface circuit unit comprises an ESSH interface circuit unit, an extreme value detection unit, an initial charging circuit unit and a power supply management unit. Compared with the prior piezoelectric energy recoverer, the piezoelectric energy recovery device adopts an ESSH technique in an interface circuit, overcomes the defect that the recovery power changes along with load changes in the prior method of connecting synchronous switch inductors in series, has low power consumption, not only can recover energy in the environment with high vibration level but also can effectively recover energy in the environment with low vibration level, and has broad application prospect in recovering the vibrational energy.

Description

1. Technical field [0001] The invention relates to an energy recovery device, in particular to a device for recovering structural vibration energy by using piezoelectric elements. 2. Background technology [0002] Usually, the process of using a system to obtain energy from the surrounding environment and convert it into usable energy is called energy recovery. In the past few years, there has been a wave of research into energy recovery. The increase in this type of research is due to advances in microelectromechanical techniques in modern wireless technologies and low-power electronics. Advances in these technologies have opened doors for energy recovery applications in the real world. Nowadays, some research institutions have adopted different methods for energy recovery, and the energy densities of different forms of energy recovery systems are given in the table below. [0003] Table Energy density of different energy recovery systems [0004] energy recove...

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Problems solved by technology

[0012] Among the above four interface circuits, the standard interface is simple and reliable, but under the same structure and materials, its output power is low, and it is related to the equivalent load of the subsequent circuit, that is, the output power can only be reached when the load is optimal. maximum

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