Abstract: According to one embodiment, an information processing apparatus includes a first DC-DC converter which outputs power to a first device and detects a first current value and a first voltage value of the first DC-DC converter. A second DC-DC converter outputs power to a second device and detects a second current value and a second voltage value of the second DC-DC converter. A first PWM control circuit supplies a first PWM signal to the first DC-DC converter. A second PWM control circuit supplies a second PWM signal to the second DC-DC converter. An operation unit controls a pulse width of the first PWM signal based on the first current value and the first voltage value at a first frequency, and controls a pulse width of the second PWM signal based on the second current value and the second voltage value at a second frequency lower than the first frequency.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.