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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 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 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



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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