公开(公告)号：JPH06217463A

公开(公告)日：1994-08-05

申请号：JP22225492

申请日：1992-07-30

Applicant: APPLE COMPUTER

Inventor： SUTEIIBUN JIEI YANGU ,  MAAKASU UOORUGUREN

IPC: G01R31/36 ,  G06F1/28 ,  H02J7/00

Abstract: PURPOSE: To obtain a power management unit in which a plurality of types of battery packs can be used and an optimal recharging current can be supplied by providing a memory means storing the charging information of a plurality of types of battery, and a controller means delivering the charging information in response to a battery type data. CONSTITUTION: A microprocessor 15 determines the type of a battery pack 30 through a power management unit 20 and checks the charged state of the battery pack 30 through an AC power supply 25. When the battery pack 30 is not charged fully and the difference between the ambient temperature and the battery temperature comes within a given range, charging operation is started. Consequently, the microprocessor 15 checks the voltage level of the battery pack 30 according to a charge instruction for the type of battery prestored in an RAM 20. The power management unit 20 stops the charging operation when the voltage supplied to the battery pack 30 is different from a currently available voltage and the difference is minimized, and a CPU 40 instructs to display a faulty battery.