Electronic-magnetic current isolator circuit

Details Electronic-magnetic current isolator circuit Electronic-magnetic current isolator circuit

1979-08-14

1982-08-31

Weldon, Ulysses

Electricity: motive power systems

Field or secondary circuit control

Impedance-controlled

318512, 318513, H02P 134

Patent

active

043474691

ABSTRACT:
A circuit provides an electrical output signal proportional to but electrically isolated from a current flowing in a power circuit, and more particularly, to the current supplied to the field or armature winding of a DC motor load which receives power from a rectifier circuit coupled to an AC power source. The circuit includes a transformer including at least two windings, a primary and a secondary, wound on a saturable core. The primary winding is coupled to the power circuit, whereas the secondary winding is coupled to an output circuit along with control circuit means which are adapted to keep the core out of saturation in response to a power current flowing in the primary winding which by itself is adapted to drive the core into saturation. Accordingly, the time the core is not in saturation an output current flows in the secondary winding, which is related to the primary current by the turns ratio of the transformer.

REFERENCES:
patent: 1851692 (1932-03-01), Zucker
patent: 2039044 (1936-04-01), Wolfert et al.
patent: 2468117 (1949-04-01), Schaelchlin et al.
patent: 2554203 (1951-05-01), Morgan
patent: 2652525 (1953-09-01), Nichols et al.
patent: 2855554 (1958-10-01), Conger et al.
patent: 3135911 (1964-06-01), Van Allen
patent: 3295040 (1966-12-01), Schieman
patent: 3584282 (1971-06-01), Reeves et al.
patent: 3659216 (1972-04-01), DePuy

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