Transformer flux compensation circuit

Details Transformer flux compensation circuit Transformer flux compensation circuit

1984-07-27

1986-08-19

Rubinson, Gene Z.

Electricity: power supply or regulation systems

Remote sensing

179170R, 323356, H01F 2738

Patent

active

046071423

ABSTRACT:
In a transformer-coupled interface circuit for interconnecting two-wire and four-wire telephone communication channels, there are provided a bucking winding in the transformer and a flux compensation circuit which drives the bucking winding. The flux compensation circuit includes a sensor of direct current current flowing through a primary winding of the transformer for applying power to a subscriber telephone. Also included within the compensation circuit is a current source responsive to the measured primary current for controlling the magnitude of the bucking winding current to track the primary current, thereby to reduce the flux in the transformer core and permit use of a smaller sized core. A stabilization circuit within the current source prevents oscillation resulting from feedback and reactive circuit components.

REFERENCES:
patent: 4064449 (1977-12-01), Macrander
patent: 4234763 (1980-11-01), Dijkmans et al.
patent: 4241239 (1980-12-01), Pernyeszi
patent: 4361732 (1982-11-01), Wood
"DC Flux Compensating Circuit for Reducing the Size of Transformers", Orengo et al., IBM Technical Disclosure Bulletin, vol. 21, No. 1, pp. 223-224.

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