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Emerging Technologies of Computation. Montek Singh COMP790-084 Sep 20, 2011. Today: Energy Harvesting Systems. Basics of energy harvesting why must some systems harvest energy? where do you scavenge energy from? Introductory case studies Philips CEA-LETI Next class: More case studies

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emerging technologies of computation

Emerging Technologies of Computation

Montek Singh

COMP790-084

Sep 20, 2011

today energy harvesting systems
Today: Energy Harvesting Systems
  • Basics of energy harvesting
    • why must some systems harvest energy?
    • where do you scavenge energy from?
  • Introductory case studies
    • Philips
    • CEA-LETI
  • Next class:
    • More case studies
    • Challenges and Benefits
    • Open questions
basics of energy harvesting
Basics of energy harvesting
  • What is energy harvesting?
    • no power supply, no batteries
    • somehow scavenge energy from physical env
  • What type of systems must harvest energy?
    • hard to replace/recharge batteries
    • hard to have batteries at all
    • examples?
basics of energy harvesting1
Basics of energy harvesting
  • Where do you harvest energy from?
    • ambient light/solar: using photovoltaic cells
      • range: 0.1W/sq cm direct sun; 0.1mW/sq cm indoors
      • silicon solar cells only 5-20% efficiency; 0.6V/cell
    • temperature gradients: using thermoelectric generators
      • Seebeck effect turns temp gradients into electricity
      • few hundred mV with a few Kelvin gradient
basics of energy harvesting2
Basics of energy harvesting
  • Where do you harvest energy from? (contd.)
    • Vibration energy: using electrostatic transducers
      • below 100Hz
    • RF power: using tuned antenna
      • if 2W emitted by reader: 0.5-2mW harvested at 1-2 meters distance
      • used in RFID tagging
    • Inertial kinetic energy: from human body
      • using knee brace, backpack, etc.
      • Seiko automatic watches!
basics of energy harvesting3
Basics of energy harvesting
  • Where do you harvest energy from? (contd.)
    • Biosensing: use blood glucose!
    • Acoustic vibrations: using piezoelectric transducers
    • Wind energy…
    • Tidal/water waves…
case study philips smartcard
Case Study: Philips smartcard
  • Contactless smart card
    • basic architecture
case study philips smartcard1
Case Study: Philips smartcard
  • Why asynchronous?
    • async overall consumes less energy
    • async has better current/power profile: more spread
    • async has no fixed clock rate
case study philips smartcard2
Case Study: Philips smartcard
  • Graceful performance adaption with voltage
case study philips smartcard3
Case Study: Philips smartcard
  • Smart card chip layout
    • RAM
    • ROM
    • EEPROM
    • async microcontroller
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