RF Energy Harvesting and Wireless Power for Low-Power Applications

Transcription

1 RF Energy Harvesting and Wireless Power for Low-Power Applications Emerging Technology P2100 Powerharvester TX91501 Powercaster P2110 Powerharvester P2110 Powerharvester April

2 Powercast Technology Overview Micro-power over distance using common radio waves Microwatts (µw) to low milliwatts (mw) Micro-power is useful for: Ticklecha Trickle-charging batteries Powering battery-free devices RF Source Powercast Enabled Devices Received power is determined by multiple factors: Power of RF source Distance from RF source Size / performance of receiving antenna Transmission frequency (e.g. 915MHz) 2

3 Why RF-based Wireless Power? Industrial Minimizes Operating Costs Eliminates cost to hard wire or replace batteries e.g. wireless sensors Eliminates service downtime caused by depleted batteries Reduces battery handling and disposal OEMs Improved Product Design Sealed devices less expensive enclosures and manufacturing Embedded power eliminate wires, cables, connectors Reliability improved durability, reduced product failures, eliminate ESD End-Users Convenience and Usability Placement flexibility no charging mats or charging stations Transparent charging no user action required Embedded power eliminate wires, cables, connectors 3

4 Perspective: Communication vs. Power RF Sensitivity of Wireless Devices Requir rement ma ua Communication Wake-up Receiver Power 0 - na Power Harvesting Input Power (dbm) 4

5 RF Power Sources Intentional Anticipated Unknown? 5

6 Recommended Power Profiles ion nsumpti Recommended Profiles for RF based Wireless Power Ave erage Po ower Co Low-power Wireless Sensors Hours Days Weeks Months Years Battery Run Time 6

7 Full Suite of Wireless RF Solutions Powerharvesters Modules Chipset License RF Transmitters Evaluation Boards Engineering Services Development Kits 7

8 Powercast Technology Advantages High efficiency over a broad range Load resistance Input power Recharging current No Maximum Power Point Tracking 30 (MPPT) required 20 Over 850 MHz operating bandwidth Essential for ambient energy harvesting Easy scalability for geographic regions using different frequencies Conversion Efficie ency (%) Result 0.6 Better performance 0.4 More power Simplified design-in in 0 RF to DC Normalized Efficie ency ency Normalized Effici Example of other solutions Input Power (dbm) P2110 Harvester Efficiency -3dBm (500uW) Input, 1V Load Frequency (MHz) Frequency (MHz) 8

9 Powerharvester Receivers Low Volume Applications and Prototyping t Convert RF input to DC current Power/charge management Frequency range: MHz RSSI and Data output Designed for standard 50Ω antennas RF RF Capacitor Power I/O Power I/O P1110 Continuous Power Output RF range: -5.0dBm to 20dBm Output voltage: 1.8V to 4.2V (configurable) Range of at least 3 meters P2110 Pulsed Power Output RF range: -11.5dBm to 15dBm Output voltage: 1.8V to 5.25V (configurable and regulated) Range of at least 10 meters 9

10 Powerharvester Performance Comparison Efficiency (%) RF-t to-dc Con nversion P MHz, 3V P MHz, 1.05V Power Distance Input Power (dbm) 10

11 Bandwidth Increases with Received Power P2110 Harvester Efficiency -3dBm (500uW) Input, 1V Load Normaliz zed Efficien ncy ±20% over 850MHz Frequency (MHz) 11

12 Powerharvester Chipset / Reference Design Flexible implementation High Volume Applications Wide tunable range: 1MHz to 6GHz RF harvesting down to around -12dBm input Output from 2 to 5V (higher with custom design) Same performance as P1110 / P2110 Estimated BOM: 3K, Reference designs available for license RF Harvesting Circuit Powercast chipset (3 custom ICs) other discrete components Small footprint: 0.2 in 2 /13cm

13 TX91501 Powercaster Transmitter 6.25 width 915 MHz center frequency FCC and IC certified RoHS compliant DSSS modulation (power) ASK modulation (data) W or 3W EIRP height TX W-ID TX W-ID 1.63 depth Power Jacks (2) 5V Back for tabletop placement Bottom for wall mounting Status Indicator LED Green Transmitting Red Fault Condition ~60 beam pattern Data broadcast (factory-set) Plug-and-play installation Powers virtually unlimited number of Powerharvesters Design available for license 13

14 Lifetime Power Development Kits P2110-EVAL-01 P2110-EVAL-02 Complete system for battery-free wireless applications Jointly developed with Microchip Designed for wireless sensing applications using MiWi protocol RF Transmitter (TX91501) (2) P2110 Evaluation Boards (P2110-EVB) (2) 6dBi Directional Antennas (2) 1dBi Omni-directional Antennas (2) Wireless Sensor Boards (WSN-EVAL-01) Microchip 16-bit XLP Development Board Microchip MRF24J40 PICtail/PICtail Plus daughter card Microchip PIC-kit 3 programmer/debugger Complete system for wireless battery charging Developed in conjunction with Infinite Power Solutions Features IPS THINERGY Energy Cell RF Transmitter (TX91501) P2110 Evaluation Boards (P2110-EVB) 6dBi Directional Antenna 1dBi Omni-directional Antenna Battery Charging Board (BAT-EVAL-01) THINERGY Micro-Energy Cell Evaluation Card Cable for connecting to THINERGY ADP TI ez430-rf2500 Wireless Development Tool 14

15 Intentional Transmitter Power uw Available Power Before Conversion (Estimated) 3W EIRP Transmitter 915MHz 6 dbi Receiver Antenna Distance (meters) 15

16 Intentional Transmitter Coverage Coverage Area 3W transmitter 60 feet 1900 ft feet 3300 ft 2 Average 2500 ft 2 60 ft 80 ft Effective range increases with improved RF sensitivity of the receiver and antenna performance 16

17 Ambient Wi-Fi Power uw 400 Available Power Before Conversion (Estimated) ~4uW 50mW 0 dbi 6 dbi Receiver Antenna Distance (meters) 17

18 Applications: High-Function RFID Harvest additional RF power for enhanced functionality RFID Reader Identification Sensors epaper display Battery charging Low-power radio LEDs Buzzer High-Function Tag RFID Sensor Tags epaper Signs / Labels Powercast receivers provides 10X the power vs. traditional RFID chips 18

19 Applications: Wireless Sensors Building Automation Structural Monitoring Defense Data Centers Security Industrial Monitoring Energy Management Smart Grid 19

20 Applications: Bulk Trickle Charging Freedom of placement Eliminate wires and connectors Automatic/transparent charging Multiple battery types/chemistry 20

21 Applications: Consumer Electronics Mice / Keyboards Game Controllers Media Remotes Audio / Headsets Health / Fitness Low-power Displays mws to 3ft / >100uW to 10ft 21

22 Wireless Power Calculator Quick Power Estimates Available Online Simple to Use 22