Fail-safe transformer circuit

Details Fail-safe transformer circuit Fail-safe transformer circuit

G - Physics

05

B

323/2

G05B 1/02 (2006.01) B61L 3/00 (2006.01) G05B 9/02 (2006.01) H01F 38/02 (2006.01)

Patent

CA 1042506

FAIL-SAFE TRANSFORMER CIRCUIT ABSTRACT OF THE DISCLOSURE A vital type of transformer circuit including a saturable core transducer having an input and an output winding. A source of d.c. control voltage is coupled to the input winding via a four-terminal capacitor to control the impedance of the secondary winding. The output winding is coupled to a trans- former having a primary, a secondary and at least one closed tertiary winding. A source of a.c. voltage is coupled through the output winding to the primary winding for inducing a.c. voltage signals in the secondary winding when d.c. control voltage is applied to the input winding and for causing the closed tertiary winding to load the transformer so that little, if any, a.c. voltage is induced into the secondary winding in the absence of d.c. control voltage on the input winding.

252185

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