Transformer with reduced signal rise time

Details Transformer with reduced signal rise time Transformer with reduced signal rise time

1994-06-07

1998-06-09

Gellner, Michael L.

Inductor devices

With electric and/or magnetic shielding means

336 84C, 336170, H01F 2736, H01F 2728

Patent

active

057641234

ABSTRACT:
A current transformer for monitoring a current in a conductor. The current transformer comprises a winding assembly that includes a resistive load. The transformer further comprises a compensation circuit that has an impedance selected to reduce output signal overshoot across the output terminals of the current transformer caused by the intrinsic inductance of the resistive load. The transformer also comprises a small gauge semi-rigid coaxial cable to reduce a loop pickup area formed by the conductive paths that connect the winding assembly terminals of the winding assembly and the output terminals of the current transformer. This results in output signal overshoot across the output terminals being further reduced. Additionally, the transformer comprises a transformer shield that encloses the winding assembly and has end portions that do not contact each other to define a gap that prevents the transformer shield from acting as a shorted turn. The end portions overlap each other so as to reduce penetration of stray magnetic flux through the gap and further reduce output signal overshoot. All of the transformer shield is spaced from the winding assembly and the transformer shield does not enclose another transformer shield. This reduces stray capacitances between the transformer shield and the winding assembly so that the frequency response of the current transformer is flattened and ringing in the output signal is reduced.

REFERENCES:
patent: 3146417 (1964-08-01), Pearson
patent: 5216356 (1993-06-01), Owen

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