powercast overview

8/2/2019 Powercast Overview

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©2010 PowercastCorporation 1

OEM End DevicesPowercaster™ Transmitter Powerharvester™ Receivers



Powercast Technology Overview

• Enables the delivery of micro-power overdistance using common radio waves

– milliwatts and microwatts

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©2010 PowercastCorporation

• “Green” power solution – eliminates wires and simplifies installation

– provides lifetime power to battery-free devices

– reduces/eliminates battery replacement

2



Wireless Power from Radio Waves

Features

• Power over distance

• One-to-many powering

• Controllable wireless ower

Benefits

• Provide lifetime power

– Replenish battery energy

– Continuous trickle charge

• Zero maintenance devices

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– Continuous

– Scheduled

– On-Demand

– Battery-free – Inaccessible locations

– Increased deployment

• Enhance device capabilities

– Sealable

– Waterproof

– Other feature enablement

3



Power Source Categories

?

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Anticipated UnknownIntentional



Ambient RF vs. Dedicated Tx

Ambient RF (Anticipated/Unknown)• Infrastructure is already in place (TV, radio, mobile, etc)

• Limited amount of power• Broadband antennas are larger than desired

• Received power can fluctuate

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Dedicated Power Transmitters (Intentional)• Provide application enablement (short to mid-range)

• 24x7 availability and consistent power

• Negligible energy use (similar to a night-light)• Far less RF exposure than your mobile phone

• Engineered power solution

5



Simplifying RF Design

Data

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Custom Design

Drop-In Modules

Power



Product Portfolio

P1110 Powerharvester™ Receiver• Battery Charging• Direct Power

• Remote Activation

P2110 Powerharvester™ Receiver• Battery-free devices•

0.5”

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Powercaster™ Transmitter• 4 watts, DSSS

• 915 MHz• ID number broadcast

• Remote Activation

Sensor / Receiver Module• Antenna• Powerharvester™ Receiver

• Other electronics- battery charging- wireless sensors



Powerharvester Receivers

P1110 – Battery

• Converts RF to DC

• Received Signal StrengthIndicator (RSSI) output

• Data out ut

P2110 – Battery-Free

• Converts RF to DC

• Received Signal StrengthIndicator (RSSI) output

• Data out ut

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• Overvoltage protection – User adjustable up to 4.2V

• Regulated output voltage – User adjustable up to 5.25V

• External MCU interrupt

• MCU control of DC output

9

Standard 50Ω antennas

Regular manufacturing processes

Designed for:



P1110 Powerharvester™ Receiver

Typical Application

Pin Configuration

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RF to DC

Converter RFIN

ALK

3

2 5

10

6

VOUT

LI1

7

8

9

Voltage

Monitor

4

VSET

Functional Block Diagram

Max Output Voltage SelectionALK=3.3V, LI=4.2V, VSET=custom

RSSI and Data Output



P2110 Powerharvester™ Receiver

1.25V

1.05V

Pin ConfigurationTiming Diagram

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P2110Microprocessor

GNDCAP

Sensors

Radio moduleDOUT

INT

RESET

DSET

RFIN

VOUT

Power Receiving

Antenna

Communication

Antenna

Typical ApplicationFunctional Block Diagram



Battery-Free Sensor Demo

Module Components & Features

• Powercast P2110 Powerharvester™ Receiver

• MCU: Microchip PIC24 XLP• Radio module: Microchip 802.15.4, 2.4GHz

• System power: 3.3V

• Su er ca acitor: 50mF, low ESR

Radio module

P2110 Powerharvester

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• Discrete sensors: Temp, Humidity, Light

• Wireless protocol: MiWi™ P2P

• Data packet: Node ID, Temp, Humidity, Light, RSSI

Power supplied by:

• 4 watt Powercaster™ Transmitter, 915 MHz

12

SensorsTemp/Humidity/Light

MicrocontrollerSuper capacitor



Battery-Free Sensor Performance

80

100

120

P a c k e t s ( s )

4W EIRP Power Transmitter

Patch RX Antenna G = 3.9

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0

20

40

60

0 5 10 15 20 25 30 35 40 45

T i m e b e t w e

e n

Distance (ft)



Powercaster™ Transmitter

• 915 MHz center freq.

• DSSS modulation

• 4 Watts EIRP

• Antenna Gain ~6

6.25” width

6.75”height

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• 8-bit ID (On-Off Keying)• Mounting holes (8)

14

1.63” depth

Status Indicator LEDGreen – TransmittingRed – Fault Condition

Power Jacks (2) – 5VBack – for tabletop placementBottom – for wall mounting



Wireless Power Calculator

•Simple analysis tool

• Excel format

Wireless Power Calculator v1.1

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Simplfied Friis Equation

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• Minimal parameters

15

http://www.powercastco.com/resourceshttp://www.powercastco.com/wireless-power-calculator.xls

Input Paramaters

Frequency 915MHz e.g. 2.4 GHz = 2400 MHzTransmitter Power 1.0Watts

Transmitter Antenna Linear Gain 4.0 do not use dBi

Receiver Antenna Linear Gain 6.0 do not use dBi

Distance 5.0meters

RF-to-DC Conversion Efficiency 60% use 50-75%

Wavelength 0.328meters

Available Power (after RF-to-DC conversion)

0.392mW

391.563uW



Device Power Profiles

r C o n s u m

p t i o n

>10 W

Target Profiles forRF-based Wireless Power

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A

v e r a g e P o w

Battery Run Time

Hours Days Months Years

>50 mW

<1 mW

Low-powerWirelessSensors



Sensor Networks Won’t Scale Using Batteries

n a g e m e n t E f f o r t

Battery-Powered

“The Internet of Things”

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10s 100s 1000s

C o s t / M

Battery-Free

BatteryReplacement

“Industry will need to manage wireless sensor networks involving tens of thousands of

nodes with their own power. These cannot be visited without great expense and labor and

some cannot be visited at all.” Dr. Peter Harrop, Chairman, IDTechEx (UK)

Nodes

April 26, 2007



Target Applications

Defense

Energy Management

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Industrial Monitoring

Location Tracking



Wireless Power distribution is similar to otherwireless infrastructure

• Any to Any

• Redundancy

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• Distributed

• Area Coverage



A complete wireless infrastructurefor micro-power and data

Power

Near-termPotential:

Network

Data

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Data

20



Ambient micro-powerfrom existing infrastructure

Long-termVision:

Network

ZigBee

TXT

Mobile

Mobile

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Wi-Fi

TXT

TXT

EnOceanTV

powercast overview

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