Protective circuit for d.c. circuit

Details Protective circuit for d.c. circuit Protective circuit for d.c. circuit

1977-04-15

1978-11-21

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

318341, H02H 324

Patent

active

041268890

ABSTRACT:
A protective circuit for protecting a main d.c. circuit of the kind comprising a d.c. power source, a d.c. load, a contactor and a chopper. In the protective circuit, a resistor is connected in parallel with the series-connected contactor and load to permit continuous application of power supply voltage across the chopper. A circuit is connected to the connection point of the load and chopper to provide a signal synchronous with on-off of the chopper, and the output signal of this circuit and a signal corresponding to a chopper-on signal are applied to a logic circuit which provides the logical sum of these inputs for the detection of commutation failure of the chopper. The output of the logic circuit turns on a thyristor for deenergizing the contactor thereby disconnecting the load from the power source.

REFERENCES:
patent: 3484652 (1969-12-01), Thiele
patent: 3689818 (1972-09-01), Morton et al.
patent: 3902105 (1975-08-01), Delaney et al.

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