Agilent - Energy Harvesting Network

Agilent - Energy Harvesting Network
Ultra Low
Dynamic Energy
Measurement
New Agilent Solution
To Address
Old Measurement
Challenges
Carlo Canziani
EMEA Business Development
London March 28th, 2012
Demand for Energy Harvesting
from Wireless Sensor Network
Wireless Sensor Network devices
today relies on batteries
When battery is dead ?
It’s a piece of junk
Smart Building, Structural Monitoring, Wearable Devices
demand for long life, maintenance free.
2
Energy Harvesting
Energy Harvesters,
Ultra Low Power Microcontroller
Transmitter
Receiver
need to be combined with a great:
Power Management
Harvester
Energy
management
and storage
Microcontroller
and sensor
Simplified block diagram of a Wireless Sensor
3
Transmitter
Power Management - Measurement Challenges
with Traditional T&M Equipments
Active
current pulses
A
Idle
current pulses
Offset and Noise
nA
Sleep current
Typical Wireless Device Energy Drain
4
Seamless Ranging
Benefit in Ultra Low Energy Measurements
Active
current pulses
A
Wipe out offset
and noise errors
nA
Idle
current pulses
Sleep current
Get the full picture
5
Seamless Ranging Measurement
All new, Agilent-exclusive feature – never been done before
• Can change range, without glitch, mid-sweep
and not lose any readings
• 200 kHz, 18-bit digitizer acts likes single range of ~28-bits
Yesterday
Today
Seamless Off
Seamless On
See the complete current waveform you’ve never seen before
– from nA to A –
in one pass and one picture
6
Agilent N6781A Seamless Ranging Innovation Performance
Voltage
Range
20V
Measurement
Accuracy
1V
100 mV
±(0.025% + 1.2mV) ±(0.025% + 75µV) ±(0.025% + 50 µV)
Seamless measurement between these 3 ranges
Current
Range
Measurement
Accuracy
3A
±(0.03% + 250 µA)
100 mA
1 mA
10 µA
±(0.025% + 10µA) ±(0.025% + 100 nA) ±(0.025% + 8 nA)
Seamless measurement between these 3 ranges
7
•
Seamless ranging continually changes ranges without glitch nor lose readings
•
200 kHz, 18-bit digitizer, with seamless ranging, acts likes single range of ~28-bits
•
3 A range with an effective offset error as low as 100 nA (0.03 PPM)
•
Accurate measurements from Amps to µA during a single scope sweep or data-log
Operation as a Virtual shunt
Realistic assessment of DUT with actual harvester
Energy
Source
(Harvester)
+
_
Current
Drain
+
_
0 Volts
_ Digitizing Zero ohm Ammeter +
←N6781A SMU Aux In Voltage Measurement
Single reading, Scope or Datalogger with Seamless Ranging
8
MCU,
Sensor
and TX
Device Energy Drain
Single Shot Acquisition - µJ
9
Source Measure Unit N6781A
for Modular DC Power Analyzer N6705B
Source
Load
-1A
+6V
-3A
 Voltage Source
 Current Source
 Electronic Load
 Arbitrary waveform for Source and Sink
 Capture Single Shot Event
 Multiple Channels
 Time Correlated Measurements
 Trigger IN/OUT
10
+20V
+1A
+6V
+3A
Summary
Adoption of Energy harvesting for Wireless Sensor is a top priority
Wireless devices operate in short bursts of activity to conserve power
• Applicable to a very wide variety of devices
• Resulting current drain is pulsed
The high peak and low average values of current drain signals are
challenging for traditional test equipment to measure accurately:
• Dictates needing DC measurement offset errors < µA
• Traditional test equipment offset error mA is too high!
Innovation in the form of seamless ranging resolves the inherent problem of
DC measurement offset error for accurately measuring dynamic current
drain
www.agilent.com/find/N6781A-EU
11
Questions
“Save the Planet
One Battery at Time”
Carlo Canziani
Business Development Manager
+390 292 608 689
carlo_canziani@agilent.com
12
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