Using energy harvesting to power wireless sensors
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Using Energy Harvesting to Power Wireless Sensors. Understanding Smart Sensors. October 11, 2012 Randy Frank. Agenda. The Energy Harvesting System Energy Harvesting Techniques Storage Techniques The Energy Budget Tools to Get Started. Energy Harvesting. Avoids battery replacements.

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Using energy harvesting to power wireless sensors

Using Energy Harvesting to Power Wireless Sensors

Understanding Smart Sensors

October 11, 2012Randy Frank


Agenda

Agenda

  • The Energy Harvesting System

  • Energy Harvesting Techniques

  • Storage Techniques

  • The Energy Budget

  • Tools to Get Started


Energy harvesting

Energy Harvesting

  • Avoids battery replacements

Energy Source

Energy

Harvester

Energy

Storage

Microcontroller

Transceiver

Sensor

Power

Management

Desired

Measurement


Energy harvesting techniques

Energy Harvesting Techniques

  • Thermoelectric

  • Vibration

  • Solar

  • Electromechanical

  • RF


Energy harvesting sources

Energy Harvesting Sources


Energy harvesting applications

Energy Harvesting Applications

Automobiles

Bridges/Structures

Building Automation

Industrial Automation

Remote Wireless Sensing


Bulk teg

Bulk TEG

Source: Marlow Industries


Mems teg

MEMS TEG

Source: Micropelt


Vibration sensing

Vibration Sensing

Source: KCF Technologies


Photovoltaic eh

Photovoltaic EH

Source: MicroStrain


Electromechanical energy harvesting

Electromechanical Energy Harvesting

  • Perpetuum

Perpetuum


Electromechanical eh

Electromechanical EH

  • Switch activated energy harvesting

  • When the spring of EnOcean’s ECO 200 snaps, electromagnetic induction produces a short voltage pulse lasting a few milliseconds

Converted energy transmits a signal up to a few hundred meters

Source: EnOcean


Rf eh

RF EH

  • Powercast

Source: Powercast


Rf eh1

RF EH

Source: Powercast


Storage techniques

Storage Techniques

  • Thin-film, solid state batteries

    • Cymbet

    • Infinite Power Solutions

  • Ultracapacitors

    • CAP-XX

IPS


Energy harvesting the energy budget

Energy Harvesting: The Energy Budget

  • Every component must be scrutinized for its contribution or power consumption.

Energy Source

Energy

Harvester

Energy

Storage

Microcontroller

Transceiver

Sensor

Power

Management

Desired

Measurement


Vibration sources

Vibration Sources


Energy for transmitting

Energy For Transmitting

Source: Cymbet


Energy harvesting development kits

Energy Harvesting Development Kits

  • Many development kits/tools to get started

  • Powercast

  • Microchip Technology


Ips eval eh 02

IPS-EVAL-EH-02

  • Demonstrates wireless indoor environmental sensing, energy harvesting, energy storage and power regulation for the development of autonomously powered wireless sensor systems.

  • MCU and radio Microchip

Infinite Power Solutions


Ips eval eh 021

IPS-EVAL-EH-02

  • Multiple indoor environmental sensors:

    • Passive Infra-Red (PIR) occupancy sensor

    • Humidity sensor

    • Ambient light sensor

    • Temperature sensor

  • MAX17710 device from Maxim Integrated Products

Infinite Power Solutions


Solar energy harvesting development kit

Solar Energy Harvesting Development Kit

  • Uses Microchip Technology’s PIC® MCUs with eXtreme Low Power (XLP)

  • sleep currents down to 20nA

  • active mode currents down to 50uA/MHz

  • code execution efficiency, and

  • multiple wake-up sources.

  • Uses EnerChip storage devices from Cymbet


Solar energy harvesting development kit1

Solar Energy Harvesting Development Kit

  • TI’s eZ430-RF2500-SEH

  • Includes high-efficiency solar (2.25x2.25”) panel optimized for operating indoors

  • Manages and stores additional energy in a pair of thin-film rechargeable EnerChips from Cymbet

TI’s eZ430-RF2500 runs the energy harvesting application.


Characterizing the environment

Characterizing the Environment

  • Midé Slam Stick Vibration Recorder


Combined piezoelectric and solar

Combined Piezoelectric and Solar

  • Piezoelectric Vibration & Solar Energy Harvester, SEH25w from Midé

  • Volture Piezoelectric Vibration Energy Harvester


Summary

Summary

  • Several energy sources for EH

  • Power is limited, budget wisely

  • EH systems are complex but many development tools are available


Topics later this week

Topics Later This Week

  • Friday

    Current hot topic 2: Sensor Fusion - Using the Newest Techniques for Advanced Sensors


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