Wireless Power for Remote Monitoring Applications

Transcription

1 Remote Monitoring and Control 2011 Eliminating Wires and Batteries: Wireless Power for Remote Monitoring Applications Harry Ostaffe VP, Marketing & Business Development Powercast Corporation 1

2 Wireless Power Background Demonstrated by Telsa in 1893 Multiple technologies in various stages Induction Mag. Resonance Laser Radio Frequency Powercast focused on RF for power over distance OEM modules, receiver sub systems, transmitters, systems 2

3 Perspective: Communication vs. Power Reception Capability of Wireless Devices Power Requirem ment ma ua 0 na Communication Wake up Receiver Power Harvesting Input Power (dbm) 3

4 RF Power Sources? Intentional Anticipated Unknown Ambient 4

5 Why Wireless Power? Wiring installation ranges from $100s per device to $100s per foot Wiring requires bulky termination panels Wiring changes are disruptive / costly Batteries can be liabilities Hazardous material handling and disposal Repeated maintenance cost Impact of early failure 5

6 Why RF vs. Energy Harvesting? Light / solar energy not always sufficient and rechargeable batteries are required Temperature requires large T Vibration has narrow bandwidth RF-based wireless power Send power over distance - µw, low mw One-to-many, any-to-any topologies Overcomes lack of ambient sources Controllable: continuous, scheduled, on-demand 6

7 RF-power enables benefits of wired and battery-based systems Wired / Energy Harvesting Wireless / Batteries Longevity No/Low Maintenance Flexibility Low Installation Cost Wireless / RF Power 7

8 System Elements Power Receiving Antenna Communication Antenna Energy RF DC Storage MCU Radio Power Source RF Transmitter Sensors Wireless Power Source Functionality 8

9 Antennas and Operating Distance Omni directional Directional 22 to 0dBi 1dBi 6dBi 10dBi 11dBi 12dBi 13dBi Chip antennas Patch antenna 12 x 12 ~36 Yagi antenna ~24 ~12 Receives power at feet tfrom a 3W source Distance 9

10 Available Power vs. Distance uw Available Power Before Conversion (Estimated) 3W EIRP Transmitter 915MHz 6 dbi Receiver Antenna Distance (meters) 10

11 Lifetime Power Sensor System One to Many Power Source Powercaster Transmitter BAS Ethernet or Serial TX MHz Wireless Gateway WSG 101 Access Point (for up to 100 devices) 2.4 GHz RF Powered Wireless Sensors Battery less Sensors Temperature Humidity Light Pressure Alarms Contacts 0 5/10V 4 20mA 11

12 Lifetime Power Wireless Sensors Powered wirelessly y( (915MHz) No batteries Power range up to 90 feet LOS Data transmit range of >100ft 2.4GHz, radios Both antennas internal 6dBi antenna for power 12

13 Broadcasted Power Coverage Area Coverage Area 2500 ft 2 Power from Grid 1.5W 60 ft 80 ft TX91501 Range increases with: 1. Improved RF sensitivity 2. Higher performance antennas 13

14 System Performance Time (seconds) Typical time between packets (Powercast sensor from a 3 watt transmitter) Distance (feet)

15 System Deployment Example S Network AP Power 915 MHz AP Access Point 915 MHz Power transmitter Powercast enabled Wireless Sensor 15

16 Power Through Walls Hazardous Environment No wires through the walls No batteries inside No maintenance RF energy can provide power through a wide variety of building materials 16

17 RF-Power for Substation Monitoring One-to-Many scenario Short range No batteries, es, No wires 17

18 Equipment Rack Monitoring RF Power Source Wirelessly powered receiver and sensors Access Point / Gateway 18

19 Trial Deployment: Data Center Received Power (mw) Node 4 Node 5 Node 6 Node ,140 1,365 1,590 1,815 2,040 2,265 2,490 2,715 2,940 3,165 3,390 3,615 3,840 4,065 4,290 4,515 4,740 4,965 5,190 5,415 5,640 5,865 6,090 6,315 6,540 6,765 6,990 7,215 7,440 7,665 7,890 8,115 8,340 8,565 8,790 9,015 9,240 9,465 9,690 9,915 10,140 10,365 10,590 10,815 11,040 11,265 11,490 11,715 11,940 12,165 12,390 12,615 12,840 13,065 13,290 13,515 13,740 13,965 14,190 14,415 14,640 14,865 15,090 15,315 15,540 15,765 15,990 16,215 16,440 16,665 16,890 17,115 17,340 17,565 17,790 18,015 18, Data samples: 15 minute intervals over 13 days Packets per Minute Node 4 Node 5 Node 6 Node ,140 1,365 1,590 1,815 2,040 2,265 2,490 2,715 2,940 3,165 3,390 3,615 3,840 4,065 4,290 4,515 4,740 4,965 5,190 5,415 5,640 5,865 6,090 6,315 6,540 6,765 6,990 7,215 7,440 7,665 7,890 8,115 8,340 8,565 8,790 9,015 9,240 9,465 9,690 9,915 10,140 10,365 10,590 10,815 11,040 11,265 11,490 11,715 11,940 12,165 12,390 12,615 12,840 13,065 13,290 13,515 13,740 13,965 14,190 14,415 14,640 14,865 15,090 15,315 15,540 15,765 15,990 16,215 16,440 16,665 16,890 17,115 17,340 17,565 17,790 18,015 18,240 19

20 Low Frequency for Range/Power Longer range Acceptability of antenna size Lower transmitter power Higher received power Omni-directional Tx/Rx Freedom of placement 20

21 Low Frequency Example 200m x 200m area Equivalent Power Available Transmitter Available Power Power 100m 1 watt 290 uw 4 watts 1.16mW Transmitter 21

22 Summary RF-powered system for remote monitoring is available, practical, and deployable. RF-power combines benefits of wires, energy harvesting, and batteries. Sensors can be placed in hard to service areas, even where other EH sources not available. Packet rates of several minutes or less are sufficient for many applications 22

23 Questions Thank You! Harry Ostaffe Emerging Technology P2100 Powerharvester TX91501 Powercaster P2110 Powerharvester P2110 Powerharvester 23