An ultra-low-power power management IC for energy-scavenged Wireless Sensor Nodes
Seeman, M.D.
Sanders, S.R.
Rabaey, J.M.
EECS Dept., Univ. of California, Berkeley, CA;
This paper appears in: Power Electronics Specialists Conference, 2008. PESC 2008. IEEE
Publication Date: 15-19 June 2008
On page(s): 925-931
Location: Rhodes,
ISSN: 0275-9306
ISBN: 978-1-4244-1667-7
INSPEC Accession Number: 10155220
Digital Object Identifier: 10.1109/PESC.2008.4592048
Current Version Published: 2008-08-08
Abstract
A power interface IC is designed and demonstrated to convert and manage power for a wireless tire pressure sensor node. The IC includes two switched-capacitor DC-DC converters to supply power to the various components of the sensor at their appropriate voltages. The design of the two integrated converters is discussed, including the optimization of capacitors and power transistors. The losses due to parasitic capacitances are analyzed. Two gate drive techniques are used to drive the gates of the floating triple-well transistors. A synchronous rectifier efficiently harvests energy from an electromagnetic shaker and control circuitry regulates the output voltage while minimizing power consumption. The two converters achieve efficiencies of approximately 84% while the synchronous rectifier achieves an efficiency of 88%.
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