Back to results
US 5,747,980 AGranted
Differential transformer correction by compensation
AssigneeLeviton Manufacturing Co., Inc.
InventorBernard Gershen
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeLeviton Manufacturing Co., Inc.
InventorBernard Gershen
Estimating the term…
A differential transformer includes a magnetic core within which difference signal detection inaccuracies resulting from non-homogeneity within the core are corrected by compensation. A phase wire extends proximate the magnetic core for transporting a first current in a first direction. A neutral wire extends proximate the magnetic core center for transporting a second current in a second direction which is substantially opposite the first direction. A shunt wire is electrically connected to one of: the phase wire and the neutral wire depending on whether the transformer is undersensitive or oversensitive. The shunt wire shunts a portion of the current flowing in one of the phase and neutral wires such that first and second signals are generated in the transformer as a result of said first and second currents that are substantially equal.
A differential transformer comprising a toroidal core formed of magnetic material which displays a non-uniform permeability resulting in a compromised differential signal detection ability including means for correcting said differential signal detection ability by compensation, said differential transformer further comprising:
A differential transformer with at least one toroidal core formed of a magnetic material in which erroneous signal differential detection occurring in said transformer pursuant to permeability inconsistencies within said core material are adjusted by compensation, said transformer comprising:
A ground fault circuit interrupter including a differential transformer comprising a toroidal core through which a phase wire and a neutral wire for carrying current to and from a load are threaded, said differential transformer for detecting a difference in currents flowing within said phase and neutral wires and further comprising:
A method for compensating for erroneous difference signal detection within a differential transformer resulting from permeability inconsistencies present with a material forming a core of said transformer, comprising the steps of:
Dependencies are inferred from the claim text.