ELECTRIC POWER CONTROL UNIT AND COMPUTER SYSTEM

摘要

PROBLEM TO BE SOLVED: To correctly manage a current battery state by clearing the calculated error between a real capacity value which is accumulated each time a charging/ discharging cycle is repeated and the remaining capacity value to zero. SOLUTION: When a low-battery detection part 204 detects the secondary battery of a battery pack 19 entering a low-battery state, the discharging of the secondary battery is switched to only a disk drive. Consequently, even when the computer is powered OFF or switched to an AC adapter power supply 20, the secondary battery continues to be discharged up to its discharging end voltage. After the secondary battery is discharged up to the discharging end voltage value, the current discharging capacity is used to update the real capacity value of an EEPROM 191.