Vital safety monitoring circuit

Details Vital safety monitoring circuit Vital safety monitoring circuit

1987-06-09

1988-07-05

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307359, 307257, 328119, H03K 5153, H03K 522

Patent

active

047556927

ABSTRACT:
A vital safety monitoring circuit including an electromagnetic transformer for feeding periodic check signals into one leg of a balanced bridge network having a pair of input and output terminals. A solid-state switching circuit is connected across the pair of input terminals. An operational amplifier circuit is connected across the pair of output terminals. An optical coupler circuit is connected to the operational amplifier for producing output signals corresponding to the periodic check signals when the solid-state switching circuit is nonconductive and in the absence of a critical component or circuit malfunction.

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