ENERGY HARVESTING FROM MOTION FOR AUTONOMOUS DEVICES
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1 ENERGY HARVESTING FROM MOTION FOR AUTONOMOUS DEVICES ERIC YEATMAN DEPARTMENT OF ELECTRICAL ENGINEERING IMPERIAL COLLEGE LONDON
2 HOW DO WE GENERATE POWER?
3 FROM MOTION
4 HOW IS HARVESTING DIFFERENT? Local generation for local use Miniaturisation Generator not necessarily anchored to ground
5 INERTIAL ENERGY HARVESTERS Mass mounted on a spring within a frame Frame attached to moving host (person, machine ) Host motion vibrates internal mass Internal transducer extracts power transducer
6 ELECTROSTATIC HARVESTERS Variable capacitor: simple structure Needs priming, or electret Hard to get high force plus good travel range: limits power He C., Kiziroglou M.E., Yates D.C., Yeatman E.M., IEEE Sensors Journal, 11(12), (2011), Stark B.H., Microsystem Technologies, 12, (2006), K. Matsumoto, K. Saruwatari, Y Suzuki, Proc. PowerMEMS 2011, Nov 15-18, Seoul, Korea, OMRON / IMEC Harvester
7 ELECTROMAGNETIC HARVESTERS Coil and magnet- like conventional generators Don t miniaturise well coil losses Small low frequency motion limits output voltage: hard to rectify Univ. of Freiburg Univ. of Southampton
8 PIEZOELECTRIC HARVESTERS Need piezoelectric material Good output voltage even at low frequency Weak electromechanical coupling: needs high Q operation
9 FREQUENCY UPCONVERSION Convert from low frequency, low Q input to higher frequency, high Q transducer oscillation Improves coupling for piezoelectrics Improves output voltage for electromagnetic devices Kulah & Najafi, patent filing 2005 P. Pillatsch, E.M. Yeatman and A.S. Holmes, PowerMEMS 2013, London, Dec 3-6, 2013.
10 How Much Power? World generation capacity 4 terawatts Power station 1 gigawatt 10 9 House 10 kilowatts 10 4 Person, lightbulb 100 watts 10 2 Laptop, heart 10 watts 10 1 Cellphone 1 watt 10 0 Wireless sensor 1 milliwatt 10-3 Wristwatch 1 microwatt 10-6 Cellphone signal 1 nanowatt 10-9
11 Inertial Energy Harvesters: Available Power assume: source acceleration amplitude a o and frequency f Proof mass m, max internal displacement z then maximum power P = 2m z a o f
12 Inertial Energy Harvesters: Available Power Sensor node watch cellphone laptop Plot assumes: proof mass 10 g/cc source acceleration 1g
13 Falling Sensor Power Requirements Analog Devices ADXL362 3 axis accelerometer: - less than 2 μa at 100 Hz output data rate Micropower CMOS imaging chip: pixels, 14 µw at 7 frames per second S.U. Ay, IEEE Trans. Biomedical Circuits and Systems 6, (2011).
14 power (mw) Harvester Power Compared to Batteries volume (cc) f = 1 Hz f = 10 Hz Battery (1 mo) Battery (1 yr) Plot assumes: proof mass 10 g/cc source acceleration 1g Li battery 1 kj/cc
15 WHAT IS THE KILLER APP?
16 Tire Pressure Monitoring? Huge market Sensor inaccessible to vehicle power Batteries dominate today
17 Watches? Huge Successful devices (e.g. Seiko) Peak power > 50 µw Electromagnetic: needs gear train to increase speed (& voltage), good bearings Precision mechanics, not MEMS: expensive Smart watches much higher power?
18 Implanted Medical Devices? Batteries undesirable Avoid surgery for replacement Higher cost toleration Reliability crucial!! Nano-generator, U Illinois
19 Machinery?
20 Internet of Things? A Trillion sensors! Battery replacement / charging impractical Variety of size and power requirements Harvester powered radio location beacon
21 What Are The IoT Apps For Motion Harvesters?
22 THINGS THAT MOVE
23 THINGS THAT MOVE
24 THINGS THAT MOVE
25 THINGS THAT MOVE
26 THINGS THAT MOVE
27 THINGS THAT MOVE
28 THANK-YOU! Prof. Eric Yeatman Dept of Electrical & Electronic Engineering Imperial College London Support: EPSRC, Digital City Exchange project
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