Compensating for the skin effect in a shunt
AssigneeSendyne Corporation
InventorYannis Tsividis
Life of this patent
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Abstract
A method and apparatus to compensate for distortion of a waveform due to the skin effect in a current shunt. The method includes modeling the complex impedance of the shunt as component complex impedances. By designing a filter corresponding to the component complex impedances, the distortion of a waveform across the shunt may be reversed to provide an accurate replica of the undistorted waveform.
Claims9
A method for use with a current shunt, the shunt having a complex impedance, wherein the complex impedance produces frequency-dependent effects upon a voltage waveform across the shunt when passing an electric current through the shunt, the method comprising:
- modeling the complex impedance of the shunt as a summation of at least two component complex impedances associated with parallel paths through the shunt, thereby creating a shunt model;
- designing a physical electronic filter corresponding to the shunt model to reverse the frequency-dependent effects of the complex impedance of the shunt on the voltage waveform;
- physically connecting the filter to the shunt by an electrical connection, thereby applying the filter to the frequency-dependent voltage waveform, wherein the frequency-dependent voltage waveform is transformed into a linear function of the passing current;
- and
- reading the transformed value of the passing current,
- wherein the step of modeling the complex impedance of the shunt further comprises:
- modeling the parallel paths through the shunt as a parallel connection of at least two branches, each branch comprising a series connection of an inductor having a value of inductance and a resistor having a value of resistance;
- and
- assigning a numerical value to the value of inductance and a numerical value to the value of resistance for each branch of the shunt model.
Dependencies are inferred from the claim text.