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Related Experiment Videos

A 66pW Discontinuous Switch-Capacitor Energy Harvester for Self-Sustaining Sensor Applications.

Xiao Wu1, Yao Shi1, Supreet Jeloka1

  • 1University of Michigan, Ann Arbor, MI.

Symposium on VLSI Circuits : [Proceedings]. Symposium on VLSI Circuits
|April 11, 2017
PubMed
Summary

This study introduces a novel discontinuous harvesting method for switch capacitor DC-DC converters, achieving ultra-low power energy harvesting with over 40% efficiency and a 10x improvement in performance.

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Area of Science:

  • Electrical Engineering
  • Power Electronics
  • Energy Harvesting

Background:

  • Ultra-low power energy harvesting is crucial for autonomous systems.
  • Traditional DC-DC converters face efficiency challenges at picowatt (pW) power levels.
  • Minimizing switching and leakage losses is key for efficient energy harvesting.

Purpose of the Study:

  • To develop a discontinuous harvesting approach for switch capacitor DC-DC converters.
  • To enable efficient energy harvesting at ultra-low power levels (pW range).
  • To optimize the trade-off between converter losses and Maximum Power Point Tracking (MPPT) losses.

Main Methods:

  • Implemented a discontinuous harvesting strategy with slow charge accumulation and burst-mode transfer.
  • Utilized a 15pW mode controller, automatic conversion ratio modulator, and moving sum charge pump.

Related Experiment Videos

  • Designed the harvester in 180nm CMOS technology.

    • Main Results:

    • Achieved >40% end-to-end efficiency across an input power range of 113pW to 1.5μW.
    • Demonstrated a minimum input power requirement of 66pW.
    • Exhibited a >10x improvement compared to previous ultra-low power harvesters.

    Conclusions:

    • The discontinuous harvesting approach significantly enhances efficiency for ultra-low power applications.
    • The developed harvester overcomes limitations of traditional converters at pW levels.
    • This technology paves the way for more efficient and autonomous low-power devices.