Electronic system switchable between its primary circuit and sta

Details Electronic system switchable between its primary circuit and sta Electronic system switchable between its primary circuit and sta

1992-08-19

1994-02-22

Pellinen, A. D.

Electrical transmission or interconnection systems

Plural supply circuits or sources

Substitute or emergency source

307 35, 307 19, 307 31, H02J 110

Patent

active

052890449

ABSTRACT:
A switching system of the present invention is formed of two identical units. e.g. printed circuit board, the primary and the backup units W & P. Each unit has a switching circuit 1 such that upon receiving a first alarm signal generated due to a malfunction taking place in a main circuit 6(W) of the primary unit W, the switching circuit 1W of the primary unit transmits a second alarm signal S.sub.4 (W) to switching circuit 1P of the standby unit P, then the switching circuit 1P of the standby circuit 1P enables an output of main circuit 6(P) on the standby unit as well as transmits a control signal S.sub.9 (P) to disable an output of main circuit 6(W) of the primary unit. A plurality of the units may form a group so that two groups are in the relation of the primary and the backup. A first unit in the group collects the alarm in the own group and communicates with the first unit of the other group, so that the switching are carried out by the whole group. The switching circuit 1 may be further provided with a manual switching circuit, a switch-upon-extraction circuit which detects an extraction of the printed circuit board from the upper system, and/or a compulsive switching circuit.

REFERENCES:
patent: 5027002 (1991-06-01), Thornton
patent: 5122726 (1992-06-01), Elliot et al.

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