Patent ID: 6888896

Claim:
In a data communications system using a power feeding arrangement with a coupling transformer having an equipment side winding and a line side winding, an apparatus for reducing signal distortion caused by a flux imbalance associated with the transformer comprising: a. a distortion monitoring circuit having a monitoring input coupled to the equipment side winding of the coupling transformer and operative to generate at an error output an error signal corresponding to measurements of the signal distortion sampled by the monitoring circuit; b. a flux controller having a control input in electrical communication with the error output of the distortion monitoring circuit and operative to generate at a control output a flux cancellation signal in response to the error signal; and c. a flux generator having a first generator input in electrical communication with the control output of the flux controller and a generator output in electrical communication with the equipment side winding of the coupling transformer, the flux generator responsive to the flux cancellation signal to generate a cancellation flux to reduce the flux imbalance.