Issue No. 01 - January-March (2005 vol. 4)
DOI Bookmark: http://doi.ieeecomputersociety.org/10.1109/MPRV.2005.21
Amit Lal , Cornell University
Rajesh Duggirala , Cornell University
Hui Li , Cornell University
A long-lasting radioisotope micropower generator for self-powered sensor microsystems enables truly autonomous operation. The generator employs direct charging to convert radiated ?-particle kinetic energy into stored electromechanical energy in a piezoelectric unimorph, and employs piezoelectricity to convert the stored electromechanical energy to extractable electrical energy, with an overall conversion efficiency of 2.78 percent. The generator goes through a charge-discharge-vibrate cycle, integrating the energy collected during the charging phase. This enables high power output for a short time during the vibration cycle. The AC signal from the piezoelectric element is rectified using diodes and stored across an external capacitor. The voltage bias thus realized is used to drive low-power sensors and electronics.
Radioisotope, micropower, generator, piezoelectric, sensor, microsystem
A. Lal, R. Duggirala and H. Li, "Pervasive Power: A Radioisotope-Powered Piezoelectric Generator," in IEEE Pervasive Computing, vol. 4, no. , pp. 53-61, 2005.