Kabushiki Kaisha Toshiba

Masahiko Hagiwara

Naoki Tashiro

Hironori Ito

Katsuo Ozawa

Akihiko Uchida

Keiichi Mitsui

Yuichiro Hino

Shigeru Sekine

Shizuo Morioka

Masahiko Kasashima

Hisao Tsukazawa

Nobuyuki Hosoya

Yoshiaki Ukiya

Masayasu Tanaka

Masaru Harashima

Hirohito Motomiya

Masanori Morita

Naoki Isooka

An apparatus and method for controlling a battery power source of an electronic device by resetting battery information stored in a memory. In addition, the battery is discharged until a battery voltage reaches a prescribed discharge end voltage, even when the power source supply to the device is switched from the battery to another source. The battery information includes a realizable capacity and a residual capacity of the battery. The realizable capacity is a parameter used for indicating a battery performance and the residual capacity is used for calculating a usable residual time of the device.

Apparatus and method for controlling a power source applicable to

A battery charge circuit using a constant voltage/constant current to power charge a plurality of battery packs, a current detection circuit to detect a charge current according to a predetermined value, and control mechanisms to maintain a constant voltage charge mode when the charge current value drops below a set value within the battery pack.

Battery set structure and charge/discharge control apparatus for

In a battery-driven portable computer, a battery pack is constituted by m battery sets connected in series each including n lithium-ion secondary battery cells connected in parallel. A voltage monitor for monitoring the voltage of the terminal electrode of each battery set and a charger for independently appropriately charging each battery set in accordance with a monitor result are arranged, thereby realizing battery driving by a lithium-ion secondary battery pack having a large capacity. A computer system monitors the voltages of the battery cells which are part of a secondary battery by comparing the battery voltages with a predetermined voltage value in order to detect overdischarge (undervoltage) or overcharge (overvoltage), outputs this information outside of the battery pack, and terminates processing prior to a circuit disconnect.

In a battery-driven portable computer, a battery pack is constituted by m battery sets connected in series each including n lithium-ion secondary battery cells connected in parallel. A voltage monitor for monitoring the voltage of the terminal electrode of each battery set and a charger for independently appropriately charging each battery set in accordance with a monitor result are arranged, thereby realizing battery driving by a lithium-ion secondary battery pack having a large capacity.

Battery set structure and charge/ discharge control apparatus for

Growing community of inventors

Tokyo, Japan

Masahiko Hagiwara