PWST and High Function RFID
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The document discusses the advancements in RF-powered, passive wireless sensor tags and high-function RFID sensors, emphasizing the importance of power harvesting to enhance the functionality and efficiency of RFID tags. It outlines various features of the PowerHarvesters, their output capabilities, and their application in high-function RFID sensor technologies. Key takeaways include the potential for higher value applications through improved power efficiency and innovative circuit designs.
PWST and High Function RFID
- 1. RF-Powered, Passive Wireless Sensor Tags and High-Function RFID Sensors Expo 2012 Chicago, IL (USA) www.powercastco.com ©2012 Powercast Corporation 1
- 2. RFID Opportunity Overview • Basic tags are low-cost and pervasive • RFID chips are designed for range • High function tags are limited by power • Add-on power harvesting provides significantly more power for tags • More Power Greater Function, Higher Value www.powercastco.com ©2012 Powercast Corporation 2
- 3. RF Power Sources Intentional Anticipated Unknown ? www.powercastco.com ©2012 Powercast Corporation 3
- 4. Perspective: Communication vs. Power RF Sensitivity of Wireless Devices Communication Power Requirement mA Passive RFID uA Wake-up Receiver Mobile phones, 0 - nA 802.15.4/ZigBee, Power Harvesting WiFi, Active RFID -100 -75 -50 -25 0 Input Power (dBm) www.powercastco.com ©2012 Powercast Corporation 4
- 5. Powerharvester® Receivers Convert RF input to DC current RF Power I/O Power/charge management Frequency range: 850-950MHz RF Power I/O RSSI and Data output Capacitor P1110 P2110 • Continuous Power Output • Pulsed Power Output • Input power: -5 to 20 dBm • Input power: -12 to 15 dBm • Output voltage: up to 4.2V • Output voltage: up to 5.25V www.powercastco.com ©2012 Powercast Corporation 5
- 6. Powerharvester® Chipset / Reference Design Features / Performance Output from 2 to 5V (higher with custom design) Wide tunable range: 1MHz to 6GHz RF harvesting down to around -12dBm input Small footprint: 0.2 in2 / 1.3 cm2 Low BOM Cost RF Harvesting Circuit • Powercast chipset (3 custom ICs) • 20-25 other discrete components www.powercastco.com ©2012 Powercast Corporation 6
- 7. RFID Tag Power Requirements Power Sensors Computation Screen Update Memory Access ID read ID Memory High-Function Tag Tag Tag www.powercastco.com ©2012 Powercast Corporation 7
- 8. Power Harvesting for High-Function RFID Sensor High-Function Tag Tags • Identification • Sensors Biometric • Processing Proximity • Biometrics Cards • Bi-stable displays • Battery charging • Low-power radio RFID / Access Control • LEDs Reader ePaper • Audio Signs / Labels Powercast receivers provide 10X power efficiency vs. RFID chips www.powercastco.com ©2012 Powercast Corporation 8
- 9. RF-power for Bi-Stable Displays Color Indicators Small Displays Large Displays Sources: adt GmbH, Vanguard ID Systems, Tego, Pervasive Displays www.powercastco.com ©2012 Powercast Corporation 9
- 10. 850MHz Bandwidth P2110 Normalized Efficiency -3dBm (500uW) Input 1.2 1 Normalized Efficiency 0.8 0.6 ±20% over 850MHz 0.4 0.2 0 500 700 900 1100 1300 1500 1700 Frequency (MHz) www.powercastco.com ©2012 Powercast Corporation 10
- 11. Wide Input Power Range for Short & Long Distance 80 P1110 - 915MHz, 3V RF-to-DC Conversion Efficiency (%) 70 P2110 - 915MHz, 1.05V Power 60 50 40 30 20 10 Distance 0 Anticipated RFID range -12 -10 -8 -6 -4 -2 0 2 4 6 8 10 12 14 16 18 20 Input Power (dBm) www.powercastco.com ©2012 Powercast Corporation 11
- 12. Harvested Power @ 915MHz 60 P1110 - 915MHz, 3V 50 Harvested Power (mW) 40 30 20 Anticipated RFID range 10 0 P2110 - 915MHz, 1.05V -12 -10 -8 -6 -4 -2 0 2 4 6 8 10 12 14 16 18 20 Input Power (dBm) www.powercastco.com ©2012 Powercast Corporation 12
- 13. Harvested Power @ 915MHz 1 P1110 - 915MHz, 3V 0.8 Harvested Power (mW) 0.6 0.4 0.2 P2110 - 915MHz, 1.05V 0 -12 -11 -10 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 Input Power (dBm) www.powercastco.com ©2012 Powercast Corporation 13
- 14. P1110/P2110 Hybrid for RFID Charge Time for Sustained 3V Regulated Output 16 14 12 Charge Time (sec) 10 8 0dBi Rx antenna @ 2m 6 0.35mW 1dBi Rx antenna @ 1m 4 2 1.8mW 0 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 10 Input Power (dBm) Charge time based on 4W RFID reader charging 1000uF capacitor www.powercastco.com ©2012 Powercast Corporation 14
- 15. Passive Wireless Sensor Tag Demo P2110 RF Powerharvester Radio module Super Cap Microcontroller Sensors Temp/Humidity/Light www.powercastco.com ©2012 Powercast Corporation 15
- 16. Productized PWST Operated at 80 feet from 3W Tx with Omni-Directional 6dBi directional Rx Rx antenna antenna (WSN-1002) (WSN-1001) www.powercastco.com ©2012 Powercast Corporation 16
- 17. Sensor Tag Development Tool Credit card Programming form factor interface Charging Silicon Labs capacitor Wireless MCU 915MHz RF Powerharvester Data Antenna 915MHz Power Antenna www.powercastco.com ©2012 Powercast Corporation 17
- 18. 915MHz(ft.) vs. AverageSensor Tag Distance (UHF) Current Delivered (uA) 10000 Charge Current @ 4.0V 1000 Average Current (uA) 100 Average current (uA) 4.0 10 1 2uA @ 15 feet from 3W Tx 0.1 0 2 4 6 8 10 12 14 16 18 Distance (ft) Distance (ft.) www.powercastco.com ©2012 Powercast Corporation 18
- 19. 13.56MHz (HF RFID) – Efficiency 45 1.2V 40 35 30 Efficiency (%) 1V 2V 25 20 >25% Conversion Efficiency for harvested power before voltage boost 15 10 Based on preliminary designs 5 using P2110 circuit architecture 0 -10 -5 0 5 10 15 Input Power (dBm) www.powercastco.com ©2012 Powercast Corporation 19
- 20. 13.56MHz (HF RFID) – Harvested Power 7 Preliminary designs support charging 2V 6 range of inches to several feet Harvested Power (mW) 5 1.2V 4 1V 3 2 1 0 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 10 11 12 Input Power (dBm) www.powercastco.com ©2012 Powercast Corporation 20
- 21. Summary • Great opportunities for high-function RFID • RF power harvesting is a key enabler • Core RF circuit design can support HF and UHF www.powercastco.com ©2012 Powercast Corporation 21
- 22. Powercast Resrouces • Documentation – http://www.powercastco.com/resources/ • Wireless power calculator (Excel) – http://www.powercastco.com/power-calculator/ • Videos and Presentations – http://www.youtube.com/powercastco – http://www.slideshare.net/powercast Emerging P2100 TX91501 P2110 P2110 Technology Powerharvester® Powercaster® Powerharvester® Powerharvester® www.powercastco.com ©2012 Powercast Corporation 22