NDLI: Battery Squeezing under Low-Power Pulsed Loads

Content Provider	IEEE Xplore Digital Library
Author	Penella, M.T. Gasulla, M.
Copyright Year	2008
Description	Author affiliation: Instrum., Sensors & Interfaces Group, Univ. Politec. de Catalunya, Castelldefels (Penella, M.T.; Gasulla, M.)
Abstract	Autonomous sensors are wireless measurement systems that in order to achieve longer runtimes remain inactive most of the time and wake up only to acquire and send data. As a result, autonomous sensors can be modeled as low-power pulsed loads. Power is provided by batteries, either primary or secondary. Whenever the autonomous sensor wakes up, a significant voltage drop can appear between the battery terminals, thus preventing to squeeze all the available energy from the battery and leading to a reduction of the load runtime. This work proposes the use of hybrid-storage units, formed by the parallel combination of a battery and a (super)capacitor, in order to extend the runtime of low-power pulsed loads. We show analytical expressions of the transient voltage drop at the terminals of the hybrid-storage unit and deduce the minimal value of the capacitor to be used for a given voltage drop. Experimental results support the theoretical analysis. We tested several combinations of batteries and capacitors as the hybrid-storage unit under pulsed loads of tens of milliamps. Finally, we assessed the performance of the hybrid-storage unit when using as a load a commercial transceiver intended for wireless sensor networks applications.
Starting Page	1184
Ending Page	1188
File Size	4887289
Page Count	5
File Format	PDF
ISBN	9781424415403
ISSN	10915281
DOI	10.1109/IMTC.2008.4547219
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-05-12
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Runtime Voltage Wireless sensor networks Capacitors Sensor systems Battery charge measurement Time measurement Power system modeling Transient analysis Testing wireless sensor networks Autonomous sensors battery impedance battery-capacitor storage battery squeezing runtime extension
Content Type	Text
Resource Type	Article
Subject	Instrumentation Electrical and Electronic Engineering

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