US 12,442,838 B2
Current monitor combining a shunt resistor with a Rogowski coil
Daniel G. Knierim, Beaverton, OR (US); and David L. Knierim, Wilsonville, OR (US)
Assigned to Tektronix, Inc., Beaverton, OR (US)
Filed by Tektronix, Inc., Beaverton, OR (US)
Filed on Jul. 21, 2023, as Appl. No. 18/225,034.
Claims priority of provisional application 63/392,471, filed on Jul. 26, 2022.
Prior Publication US 2024/0036079 A1, Feb. 1, 2024
Int. Cl. G01R 15/18 (2006.01); G01R 15/14 (2006.01); G01R 19/00 (2006.01)
CPC G01R 15/181 (2013.01) [G01R 15/146 (2013.01); G01R 19/0092 (2013.01)] 23 Claims
OG exemplary drawing
 
1. A current measurement device, comprising:
a shunt having sense leads, the shunt configured to be located in a current path for a current to be measured; and
a Rogowski coil at least partially wrapped around the shunt;
a compensating pole electrically connected to the Rogowski coil; and
a filter applied to an output of the compensating pole, the filter configured to compensate for errors in a cross-over region between a shunt-dominated response and a Rogowski-coil-dominated response when a skin effect begins to change an effective resistance,
the current measuring device configured to combine signals from the shunt and the Rogowski coil.