Electric Power Self-Supply Module for WSN Sensor Node Based on MEMS Vibration Energy Harvester

Area of Science:

• Electrical Engineering
• Materials Science
• Mechanical Engineering

Background:

• Wireless Sensor Networks (WSN) require sustainable power solutions.
• Traditional power sources limit WSN deployment and longevity.
• Energy harvesting offers a promising alternative for autonomous sensor nodes.

Purpose of the Study:

• To develop an electric power self-supply module for WSN sensor nodes.
• To integrate a micro-electro-mechanical system (MEMS) based electromagnetic vibration energy harvester with a processing circuit.
• To demonstrate the feasibility of self-powered WSNs through harvested energy.

Main Methods:

• Fabrication of a MEMS vibration energy harvester using an integrated microfabrication process.
• Design of a processing circuit for AC to DC conversion, supercapacitor charging, and stable output.
• Testing of the harvester chip's voltage output across a range of vibration frequencies.

Main Results:

• The vibration energy harvester chip successfully generated discontinuous pulse voltage.
• Output voltage ranged from tens to hundreds of millivolts between 10-90 Hz.
• A maximum output of 563 mV was achieved at 18 Hz vibration frequency.

Conclusions:

• The developed MEMS vibration energy harvester can produce sufficient voltage to meet WSN power demands.
• The self-powering module offers a viable solution for enhancing the autonomy and operational lifespan of WSNs.
• This technology paves the way for more sustainable and widespread deployment of wireless sensor networks.