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Low-G Triggered Acceleration Switch for Near-Zero Power Wake-Up Application.

Yingzhou Han1,2,3, Guozhe Xuan1,2,3, Jiahao Zhao1,2,3

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|August 26, 2022
PubMed
Summary

This study presents a low-g micro-electromechanical system (MEMS) resonant acceleration switch for zero-power wake-up applications. It triggers using ambient vibrations, activating connected sensors with minimal energy consumption.

Keywords:
MEMSacceleration switchlow-gnear-zero powerwake up

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Area of Science:

  • Micro-electromechanical Systems (MEMS)
  • Sensor Technology
  • Vibration Energy Harvesting

Background:

  • Traditional wake-up systems require continuous power, limiting their use in low-power applications.
  • Ambient vibrations offer a potential power source for triggering devices without external energy input.

Purpose of the Study:

  • To design, fabricate, and test a novel MEMS resonant acceleration switch.
  • To enable near-zero power wake-up functionality for sensor nodes using low-g vibrations.

Main Methods:

  • Utilized a cantilever beam and proof mass structure with spiral cantilever beams for low resonant frequency and threshold.
  • Designed the switch to actuate upon exceeding a specific acceleration threshold from ambient vibrations.
  • Tested dynamic responses using a piezoelectric stack setup.

Main Results:

  • The MEMS switch successfully triggered under vibration at a low frequency of 39.3 Hz.
  • The acceleration threshold for triggering was determined to be as low as 0.074 g.
  • Demonstrated the capability to wake up a connected sensor node.

Conclusions:

  • The developed MEMS resonant acceleration switch effectively utilizes low-g vibrations for wake-up applications.
  • Achieved near-zero power consumption during the dormant state, ideal for energy-constrained devices.
  • This technology offers a promising solution for self-powered, event-triggered sensing systems.