Battery-driven dynamic power management of portable systems

ABSTRACT

Battery life-time extension is a primary design objective for portable systems. Traditionally, battery life-time has been prolonged mainly by reducing average power consumption of system components. A careful analysis of discharge characteristics and the adoption of accurate high-level battery models in system-level design open new opportunities for life-time extension. In this paper, we introduce dynamic power management (DPM) policies specifically tailored to battery-powered systems. Battery-driven DPM strives to enhance life-time by automatically adapting discharge rate and current profiles to battery state-of-charge. The distinctive feature of these policies is the control of system operation based on the observation of battery output voltage. The effectiveness of the proposed policies and, more in general, of the idea of accounting for battery behavior during system design, is proved by the experiments carried out on a realistic case study, namely, an MP3 audio player.

REFERENCES

• 1: Luca Benini , Alessandro Bogliolo , Giovanni De Micheli, Dynamic power management of electronic systems, Proceedings of the 1998 IEEE/ACM international conference on Computer-aided design, p.696-702, November 08-12, 1998, San Jose, California, United States [doi>10.1145/288548.289120]
• 2: Università Presenters: Luca Benini , di Bologna , Università Alessandro Bogliolo , Stanford University Giovanni de Micheli, System-Level Dynamic Power Management, Proceedings of the IEEE Alessandro Volta Memorial Workshop on Low-Power Design, p.23, March 04-05, 1999
• 3: L. Benini , G. Castelli , A. Macii , E. Macii , M. Poncino , R. Scarsi, A discrete-time battery model for high-level power estimation, Proceedings of the conference on Design, automation and test in Europe, p.35-41, March 27-30, 2000, Paris, France [doi>10.1145/343647.343694]
• 4: S. C. Hageman, "Simple PSpice Models Let You Simulate Common Battery Types," EDN, pp. 117-132, October 1993.
• 5: S. Gold, "A PSPICE Macromodel for Lithium-Ion Batteries," 12th Annual Battery Conference on Applications and Advances, pp. 215-222, January 1997.
• 6: A. R. Karlin, M. S. Manasse, L. A. McGeoch, S. Owicki, "Competitive Randomized Algorithms for Non-Uniform Problems," Algorithmica, Vol. 11, No. 6, pp. 542-571, June 1994.
• 7: Diamond Multimedia, Rio PMP300, http://www.diamondmm.de/eng/products/rio/rio300.htm.
• 8: Cirrus Logic, EP7209 Ultra-Low-Power Audio Decoder SoC, http://www.cirrus.com/products/overviews/ep7209.html.