A Dynamic Voltage Scaling Controller for Maximum Energy Saving Across Full Range of Load Conditions

Author

Wei, Guowen ; Trescases, Olivier ; Ng, Wai Tung

Author_Institution

Laboratory for Low-Power Management and Integrated SMPS, The Edward S.Rogers Sr.Dept. of Electrical and Computer Engineering, University of Toronto,10, King´´s College Road, Toronto, ON, Canada, M5S 3G4. weig@vrg.utoronto.ca

fYear

2005

fDate

19-21 Dec. 2005

Firstpage

371

Lastpage

374

Abstract

For devices operating mainly in the standby or low power mode, energy saving from dynamic voltage scaling (DVS) is limited due to very poor efficiency of the PWM DC/DC converter operating at light load conditions, resulting in shorter than expected battery life. This paper first presents the design of a DVS controller - realized on a Xilinx CoolRunner 2 CPLD - having a 25μs worst case transient response and 15 mV average Vddstep size across an 1.30-1.90 V range. Next a scheme is proposed in which the DVS controller automatically selects between the PFM and PWM mode DC/DC conversion to realize maximum power saving across full range of load conditions.

Keywords

Automatic control; Batteries; DC-DC power converters; Dynamic voltage scaling; Pulse width modulation; Pulse width modulation converters; Size control; Temperature control; Transient response; Voltage control;

fLanguage

English

Publisher

ieee

Conference_Titel

Electron Devices and Solid-State Circuits, 2005 IEEE Conference on

Print_ISBN

0-7803-9339-2

Type

conf

DOI

10.1109/EDSSC.2005.1635284

Filename

1635284