Fail-safe transformer circuit

专利名称：Fail-safe transformer circuit发明人：Humphrey Roachsmith申请号：US05/677328申请日：19760415公开号：US04021723A公开日：19770503

摘要：A vital type of transformer circuit including a saturable core transducer havingan input and an output winding. A source of d.c control voltage is coupled to the inputwinding via a four-terminal capacitor to control the impedance of the secondary winding.The output winding is coupled to a transformer having a primary, a secondary and atleast one closed tertiary winding. A source of a.c. voltage is coupled through the outputwinding to the primary winding for inducing a.c. voltage signals in the secondary windingwhen d.c. control voltage is applied to the input winding and for causing the closedtertiary winding to load the transformer so that little, if any, a.c voltage is induced intothe secondary winding in the absence of d.c. control voltage on the input winding.

申请人：WESTINGHOUSE BRAKE & SIGNAL COMPANY LIMITED

代理人：J. B. Sotak,R. W. McIntire, Jr.

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