公开(公告)号：JP2001298875A

公开(公告)日：2001-10-26

申请号：JP2000116434

申请日：2000-04-18

Applicant: IBM

Inventor： TSUJIKADO SEIJI ,  KUBO TAKUYA ,  MATSUO HISATO

IPC: G06F1/28 ,  G06F1/26 ,  G06F1/30 ,  H02J9/00 ,  H02J9/06

Abstract: PROBLEM TO BE SOLVED: To enhance the life of a battery for backing up AC input. SOLUTION: An ON signal (SW-ON) for commanding power on is supplied to a terminal 52, the output (Q) of flip flop circuits FF64 and FF66 comes to high level(H), a signal (AC-ON/OFF) is outputted to PC, and system starting processing is started with the power supply by commercial power source. An OFF signal (SW-OFF) for commanding power OFF is supplied to a terminal 54, and the output of FF64 comes to low level(L), but the output of the FF circuit 66 keeps H until a shut down signal (shutdown COMP) is inputted from PC, so it is never switched over to the power supply of battery. In case of power failure, the signal (line-on) becomes L, so the output of an AND circuit 70 becomes H, and it is switched over to the power supply of battery until the power break treatment is finished.