Vital safety monitoring circuit

Details Vital safety monitoring circuit Vital safety monitoring circuit

H - Electricity

03

K

346/44, 324/58

H03K 5/153 (2006.01) B61L 1/20 (2006.01) B61L 23/00 (2006.01) G05B 23/02 (2006.01) G08B 21/00 (2006.01) H03K 5/22 (2006.01) H04B 3/46 (2006.01)

Patent

CA 1257905

ABSTRACT OF THE DISCLOSURE A vital safety monitoring circuit including an electro- magnetic 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 opera- tional 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.

479911

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