Interface circuit with flux cancelling transformer circuit

Details Interface circuit with flux cancelling transformer circuit Interface circuit with flux cancelling transformer circuit

1982-04-22

1983-11-08

Rubinson, G. Z.

H04M 100

Patent

active

044144350

ABSTRACT:
A circuit for interfacing a subscriber loop to subscriber terminal apparatus is provided with a transformer having a split primary winding, a secondary winding and a balance winding. A constant current source is connected to the balance winding to cause a predetermined amount of current to flow therethrough. A current sink circuit is connected serially with the primary winding for regulating the direct current flowing therethrough to an amount proportional to that flowing through the balance winding whereby the DC flux generated by the current flowing through the primary winding substantially cancels the DC flux generated by the current flowing through the balance winding.

REFERENCES:
patent: 3384810 (1968-05-01), Kelsey
patent: 3723662 (1973-03-01), Macrander
patent: 3959718 (1976-05-01), Hasegawa
patent: 4046967 (1977-09-01), O'Neill
patent: 4046968 (1977-09-01), Embree et al.
patent: 4046969 (1977-09-01), Dalley
patent: 4103112 (1978-07-01), Korsky
patent: 4232293 (1980-11-01), Harris
patent: 4243842 (1981-01-01), Gibb
patent: 4369337 (1983-01-01), Parlor

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