Abstract: According to one embodiment, an information processing apparatus includes a housing, a power supply incorporated in the housing, a conversion unit which converts a voltage supplied from the power supply, a detection unit which detects a voltage supplied from the power supply, and a control unit which, when the voltage detected by the detection unit has become less than or equal to a specific threshold value, controls the power supply so as to lower not only a voltage output from the conversion unit by a specific percentage but also a voltage supplied to the detection unit by a specific percentage.

Abstract: According to one embodiment, a power source apparatus includes a secondary battery, an input terminal that inputs charging power for the secondary battery, a voltage measuring module which measures a voltage magnitude of power input from the input terminal, a switch that controls a charging current magnitude of the secondary battery stepwise, and a controller which controls a charging operation of the secondary battery. The controller controls the switch to gradually increase the charging current magnitude of the secondary battery from zero when the controller detects that input of the charging power from the input terminal is started, based on a measurement result of the voltage measuring module, and stops the increase of the charging current magnitude when the voltage magnitude measured by the voltage measuring module becomes a predetermined value lower than the lower limit of a preset range.

Abstract: According to one embodiment, an information processing apparatus includes a housing, a power supply incorporated in the housing, a conversion unit which converts a voltage supplied from the power supply, a detection unit which detects a voltage supplied from the power supply, and a control unit which, when the voltage detected by the detection unit has become less than or equal to a specific threshold value, controls the power supply so as to lower not only a voltage output from the conversion unit by a specific percentage but also a voltage supplied to the detection unit by a specific percentage.

Abstract: A power supply apparatus includes a power converting unit for switching DC power on the basis of a pulse signal having a predetermined ON-pulse time and a predetermined pulse period, as pulse elements, thereafter smoothing the switched power, and outputting a predetermined power voltage, a control unit for calculating a new pulse-element on the basis of an output of the power converting unit, and a pulse generating unit for generating a pulse signal on the basis of the new pulse-element instructed from the control unit. The pulse generating unit generates the pulse signal of the new pulse-element from the instructed timing without waiting for a next pulse-period, even if the timing for instructing the new pulse-element from the control unit is any timing during the pulse period, irrespective of the ON-pulse time and an OFF-pulse time.

Abstract: According to one embodiment, a power supply control device controls a switching power supply circuit by a pulse width modulation signal. The power supply control device includes a memory which stores a control program including a plurality of instructions for executing a procedure of a power supply control process which controls a duty ratio of the pulse width modulation signal based on an output voltage value of the switching power supply circuit and a target voltage value, a total execution time of the plurality of instructions included in the control program agreeing with a period of the pulse width modulation signal, and a processing unit which executes the power supply control process for each period of the pulse width modulation signal by repeatedly executing the plurality of instructions included in the control program without interruption.

Abstract: According to one embodiment, control is executed to make the number of times of obtaining a current value output from a power supply unit to a CPU greater than the number of times of obtaining current values output from power supply units to DV #1, DV #2, DV #3 and DV #4.

Abstract: A power supply apparatus includes a power converting unit for switching DC power on the basis of a pulse signal having a predetermined ON-pulse time and a predetermined pulse period, as pulse elements, thereafter smoothing the switched power, and outputting a predetermined power voltage, a control unit for calculating a new pulse-element on the basis of an output of the power converting unit, and a pulse generating unit for generating a pulse signal on the basis of the new pulse-element instructed from the control unit. The pulse generating unit generates the pulse signal of the new pulse-element from the instructed timing without waiting for a next pulse-period, even if the timing for instructing the new pulse-element from the control unit is any timing during the pulse period, irrespective of the ON-pulse time and an OFF-pulse time.

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.