Compensating for the skin effect in a shunt
First Claim
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1. 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 componentcomplex 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.
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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.
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11 Claims
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1. 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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. (canceled)
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