A power supply device based on piezoelectric energy conversion

Abstract

The invention discloses a power supply device based on piezoelectric energy conversion. The power supply device comprises a piezoelectric transducer, a rectifier bridge circuit, a threshold switching circuit and a voltage standardization circuit, wherein the piezoelectric transducer is used for collecting external vibration energy, transforming the external vibration energy into a near-sine wave signal and outputting the near-sine wave signal; the input end of the rectifier bridge circuit is connected with the output end of the piezoelectric transducer; the rectifier bridge circuit is configured to convert the near-sine wave signal into a DC pulse signal; the input end of the threshold switching circuit is connected with the output end of the rectifier bridge circuit; the threshold switching circuit is configured to output the DC pulse signal in a square wave form; the input end of the voltage standardization circuit is connected with the output end of the threshold switching circuit; and the voltage standardization circuit is configured to reduce the voltage of the square wave signal to a standard voltage of 5V before outputting the square wave signal. The power supply device of invention can supply energy to a sensor by collecting the external vibration energy, can be applied to the occasion of large-area sensor layout such as early warning of forest fires, and has implementation value.

Description

technical field [0001] The invention belongs to the technical field of sensor energy supply, in particular to a power supply device based on piezoelectric energy conversion. Background technique [0002] Piezoelectric energy harvesting technology is an environmental energy harvesting technology that can convert vibrational energy into electrical energy. It has broad prospects in unconventional environments and large-scale sensor layouts, and can realize self-power supply of low-power sensor devices. Compared with the traditional small-scale power generation technology, the vibration power generation technology of piezoelectric elements has many advantages: vibration sources exist widely in the environment, but most of them have not been utilized; vibration power generation technology is suitable for occasions with mechanical vibration, The vibration source is easy to obtain, and it is clean and durable. It is used in harsh environments and has strong maintenance-free capabi...

AI Technical Summary

Problems solved by technology

[0003] First, widely used solar collectors cannot be used in environments with no sunlight or little sunlight

[0004] Second, many energy harvesting solutions use integrated chip solutions, which are costly

[0005] Third, when the environmental excitation changes or the operating voltage of the sensor changes, the switching circuit threshold cannot be changed in time

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