Japan Atomic Energy Agency

Hitachi Industrial Equipment Systems Co., Ltd.

Hideyuki Higo

Yuzo Yamamoto

Mitsuo Ikeda

Kazunori Tobita

Kiichiro Uno

Toshio Sawahata

In order to actualize a power feeding control apparatus and a charging system that are capable of efficiently charging plural storage batteries using a load-capacity controlled power source, the power feeding control apparatusis configured so that a changeover control of the feeding of the alternating-current voltage to each charger will be performed monitoring the magnitude of the alternating current flowing in each of the plural chargersto, therewith, the power feeding control apparatus performs the feeding changeover control comprising the steps of: feeding only to a predetermined one particular charger at the early stage of the start of charging, in which stage a large charging current flows into a storage battery; monitoring inflow current of the predetermined one particular charger; and switching power feeding to another charger to start feeding thereto when the inflow current reduces to the charging saturation current (a current still flowing even at the fully charged state).

Power feeding control apparatus and charging system

To make such an ordinary hub as works on the power fed through a power adapter connected to a commercial power supply be capable of maintaining its hub-function without interruption even when a commercial power supply failure occurs. The ordinary hub is connected to a line securement power supply unitthat is power-fed from a POE-compliant power-feeding hubthrough a communication cable, wherein a means for producing a power for an ordinary hub using a power fed through said communication cableso as to feed produced power to an ordinary hub; and a storage battery, which stores power while power-receiving, to be used as the power source for producing a power for said ordinary hub when a power failure, are provided in said line securement power supply unit

Network communication system and a power feeding apparatus for a network hub

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Saitama, Japan

Hideyuki Higo