| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a power management device for precisely grasping an operational state of an electric apparatus. <P>SOLUTION: Management means 5 stores a waveform of operational current originated from a power supply circuit of an electric apparatus as a unique waveform; while acquisition means 1 and 2 acquire waveforms of current supplied to the electric apparatus as power supply waveforms, and extraction means 4 extracts difference waveforms among periods of the supply power waveform. Estimation means 6 estimates an apparatus class of the electric apparatus 14 whose operational state has changed, by comparing the unique waveform stored by the management means 5 and the difference waveforms extracted by the extraction means 4. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
