A Self-powered Piezoelectric Vibration Energy Synchronous Extraction Circuit

Abstract

The invention discloses a self-powered piezoelectric vibration energy synchronous extraction circuit. The self-powered piezoelectric vibration energy synchronous extraction circuit comprises a piezoelectric element, a positive semi-cycle and negative semi-cycle detection interlocking control circuit, a positive extreme value detection circuit, a negative extreme value detection circuit, four switches, an inductor, a diode, an energy storage capacitor and a load. The positive semi-cycle and negative semi-cycle detection interlocking control circuit controls two of the four switches to be turned on in a positive semi-cycle and a negative semi-cycle respectively, the positive extreme value detection circuit and the negative extreme value detection circuit control the other two switches to be turned on when a positive extreme value and a negative extreme value are reached, LC resonance is made generated by the inductor and the capacitor inside the piezoelectric element, piezoelectric energy is synchronously extracted to the inductor, and the energy is transferred onto the energy storage capacitor through the follow current of the diode. The whole circuit is designed to be powered by itself, energy is extracted by automatically detecting the state of the piezoelectric element and controlling the on-off of the four switches, and compared with an existing piezoelectric energy extraction circuit, the self-powered piezoelectric vibration energy synchronous extraction circuit has the advantages that the size of the circuit is reduced, power consumption of the circuit is reduced, the extraction efficiency is improved, the extraction is independent of the load, and the circuit can be used within a wide vibration frequency band range.

Description

Technical field [0001] The invention relates to the field of vibration energy harvesting, in particular to a self-powered piezoelectric vibration energy synchronous extraction circuit. Background technique [0002] With the continuous development of integrated circuit technology, precision processing technology, computer technology, and wireless network communication technology, various microelectronic devices and microelectromechanical systems (MEMS) with wireless sensor networks (WSNs) as the main application form continue to emerge. With the in-depth development of WSNs in various fields such as medical care (wearable, embedded or implanted medical monitoring instruments, etc.), environmental monitoring systems (forest fires, flood monitoring, climate change, marine monitoring, etc.), home security systems, etc. , Puts forward higher requirements for the performance of various miniature electronic devices as nodes. Among them, the issue of node lifetime is of great concern. I...

AI Technical Summary

Problems solved by technology

However, the complex power supply system and energy management system of the ESSH circuit make the final output voltage of the circuit only within a low range.

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