Hub for local area network with backup power supply system

Details Hub for local area network with backup power supply system Hub for local area network with backup power supply system

1998-03-24

1999-11-23

Elms, Richard T.

Electrical transmission or interconnection systems

Plural load circuit systems

Plural sources of supply

307 46, 307 66, H02J 302

Patent

active

059905778

ABSTRACT:
A hub for a local area network according to one embodiment of the present invention includes a plurality of communication ports connected to each of nodes in the network, through which a signal is transmitted among the nodes, a signal processing circuit having at least the functions of repeating the signal among the nodes and reshaping a waveform thereof, and a power supply circuit for supplying a dc current for driving the signal processing circuit. The power supply circuit further comprises an ac/dc converter for converting an ac current applied from an external ac power supply without passing through a power switch thereto into a predetermined dc current and supplying the dc current to a load circuit including the signal processing circuit without passing through a power switch, a backup secondary battery, a charging circuit for trickle charging the dc current output from the ac/dc converter into the backup secondary battery, and a control circuit for opening and closing a current path for supplying an output current of the backup secondary battery to the load circuit.

REFERENCES:
patent: 3766403 (1973-10-01), Tsutsumi
patent: 4401895 (1983-08-01), Petkovsek
patent: 5206538 (1993-04-01), Orta
patent: 5247205 (1993-09-01), Mototani et al.
patent: 5272382 (1993-12-01), Heald et al.
patent: 5347164 (1994-09-01), Yeh
patent: 5612580 (1997-03-01), Janonis et al.

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