D.C. Current detector

Details D.C. Current detector D.C. Current detector

1982-03-29

1984-06-12

Eisenzopf, Reinhard J.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

324117R, H02H 708

Patent

active

044545533

ABSTRACT:
A current detector comprising a current-pulse duty conversion element including a core of an amorphous, magnetically soft material having a first and a second coil disposed thereon. A current which is to be determined is passed through the first coil while the current flowing through the second coil is detected. A pulse of a given frequency is applied to one end of the second coil while the other end of the second coil is connected with an element which converts the current flowing through the second coil into a corresponding voltage. A voltage developed across the element is integrated and then converted into an analog voltage. The duty ratio of the voltage pulse appearing across the element which is connected to the other end of the second coil changes in accordance with the value of current passing through the first coil, whereby the analog voltage shifts.

REFERENCES:
patent: 3818337 (1974-06-01), Groenenbroom et al.
patent: 3855528 (1974-12-01), Brown
patent: 4155397 (1979-05-01), Honsinger et al.

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