Ntt Docomo, Inc.

Mitsumi Electric Company Ltd.

Nec Corporation

Kazuhiko Takeno

Haruo Uemura

Takayuki Kanai

Yoshihide Majima

Yasuyuki Kanai

Naoki Naruse

Hirokazu Tuji

Eiki Kouroki

Mitsuhiro Takahashi

Masaki Nakamura

Tomoki Tatsuno

Keiichi Kitamura

An objective is to provide a direct current (DC) power supply system capable of maximally generating electric power in a solar power generation process in consideration of an operation state of a load device serving as a power supply destination. In a rectifier (), a traffic volume acquisition unit () acquires an operation state (traffic volume) of a communication device (), and a power calculation unit () acquires power consumption of the communication device () corresponding to the traffic volume. Moreover, the power calculation unit () acquires output power from the rectifier (). A power comparison unit () acquires electric power generated by a solar power generation device () on the basis of power consumption (W) of the communication device () and output power (P') of the rectifier (). A search operation voltage decision unit () decides a rectifier voltage of the rectifier () using a sign of a search voltage (dv) decided by a sign inversion unit () so that the electric power generated by the solar power generation device () is increased.

DC power supply system

A battery-state monitoring apparatus includes: a secondary batterysupplying an electric power to portable equipment; and an operation processing partthat can detect a battery state of the secondary batteryin a detection mode to detect the battery state of the secondary battery, the operation processing part using the secondary batteryas a power source, wherein the battery-state monitoring apparatus includes a start-up current detecting partdetecting a start-up of the portable equipment, and wherein the operation processing partwaits for a detection of the battery state in a standby mode in which power consumption is smaller than the detection mode until the start-up is detected by the start-up current detecting part, and, on the other hand, the operation processing partdetects, by intermittently performing a temporary return from the standby mode to the detection mode, the battery state of the secondary battery in a return period during which the return is made.

Battery-state monitoring apparatus

A battery condition detector configured to detect a micro short circuit of a rechargeable battery is disclosed. The battery condition detector includes a processing part configured to calculate the remaining capacity and the full-charge capacity of a rechargeable batteryand to determine the micro short circuit of the rechargeable batteryby detecting an overcharge of the rechargeable batterybased on a charged capacity charged during the charging of the rechargeable battery, the remaining capacity calculated at a calculation time immediately before the start of the charging, and the full-charge capacity calculated before the start of the charging; and a communications partconfigured to output a signal according to the determination result of the processing part

Battery condition detector, battery pack including same, and battery condition detecting method

The present invention applies load to a portable telephone by charging and discharging a secondary battery conforming to the actual way of use of the portable telephone, so that the performance of the secondary battery in a portable telephone connected for charging can be accurately tested. A battery testing device of the present invention has: a charge control circuit for controlling input power which is input to a lithium ion battery via an AC adapter; and a radio circuit for controlling output power which is output from the lithium ion battery and discharging the lithium ion battery, wherein when the lithium ion battery reaches a fully charged state, the radio circuit starts discharging while the charge control circuit stops charge of the lithium ion battery using the AC adapter, and when the lithium ion battery reaches a predetermined charged state, the charge control circuit starts charge of the lithium ion battery using the AC adapter while the radio circuit stops discharge of the lithium ion battery.

Battery testing device and battery testing method

The present invention provides a battery testing device and a battery testing method which can appropriately verify the behavior of a battery when damage occurs. Appropriately verification of battery behavior in a case of battery damage has not been achieved since a completely crushed state of a battery almost never occurs during the sue of a portable device, such as a portable telephone, and a completely crushed state of a battery is not the worst condition when determining an abnormality induced by an internal short. Therefore a secondary battery set on a test stand is partially crushed using a pressing member, and the quality of the secondary battery is determined by measuring the temperature of the secondary battery, whereby battery behavior when the secondary battery is damaged can be appropriately verified.

When a mobile phone is out of an area covered by a communication currently in use, the fact is noticed to a user and, simultaneously therewith, a message urging the user to select another communication system is displayed. During a period in which this display is performed, it becomes possible to switch the communication system through a simple procedure.

Growing community of inventors

Kanagawa, Japan

Kazuhiko Takeno