An Automatically Peak-Shift Control Design for Charging and Discharging of the Battery in an Ultrabook

Chun-Hung CHENG  Ying-Wen BAI  

Publication
IEICE TRANSACTIONS on Information and Systems   Vol.E99-D   No.4   pp.1108-1116
Publication Date: 2016/04/01
Online ISSN: 1745-1361
DOI: 10.1587/transinf.2015EDP7297
Type of Manuscript: PAPER
Category: Computer System
Keyword: 
battery,  charging,  discharging,  peak-shift,  fuzzy logic control,  

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Summary: 
As the electricity rates during peak hours are higher, this paper proposes a design for an ultrabook to automatically shift the charging period to an off-peak period. In addition, this design sets an upper limit for the battery which thus protects the battery and prevents it from remaining in a continued state of both high temperature and high voltage. This design uses both a low-power embedded controller (EC) and the fuzzy logic controller (FLC) control method as the main control techniques together with real time clock (RTC) ICs. The sensing value of the EC and the presetting of parameters are used to control the conversion of the AC/DC module. This user interface design allows the user to set not only the peak/off-peak period but also the upper use limit of the battery.