公开(公告)号：JP2000305677A

公开(公告)日：2000-11-02

申请号：JP10559599

申请日：1999-04-13

Applicant: IBM

Inventor： KINOSHITA HIDENORI ,  OGAWA MITSURU ,  MIYAJI SHINOBU ,  KATO ATSUYUKI ,  KOBAYASHI YASUHIRO ,  YOMO TAKATSUGU

IPC: G06F1/16 ,  G06F1/18 ,  G06F1/26 ,  G06F3/00 ,  G06F3/06

Abstract: PROBLEM TO BE SOLVED: To perform hot-undocking of an expanding device, for instance, without making a portable PC body shutdown. SOLUTION: In the case an eject event is detected when the portable PC body 11 having a main battery 21 is subjected to hot-undocking from an expanding device 41 having a sub battery 42, the state of the battery 42 is judged. As a result, when the battery 42 is in the middle of discharge, a power supply route to the portable PC body 11 is switched from the sub battery to the main battery. When the battery 42 is in the middle of being charged, the charging is stopped. Then, hot-undock processing is carried out.