Frequency compensating current circuit for a current-...

G - Physics – 01 – R

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G01R 27/26 (2006.01) G01R 27/10 (2006.01)

Patent

CA 1198477

TITLE A FREQUENCY COMPENSATING CURRENT CIRCUIT FOR A CURRENT-COMPARATOR CAPACITANCE BRIDGE INVENTOR Eddy So ABSTRACT OF THE DISCLOSURE A method and apparatus for rendering a high-voltage current- comparator capacitance bridge insensitive to frequency fluctuations when used for measuring inductance. A compensating current, proportional to twice the change in the current through the reference capacitor due to frequency fluctuations, is driven into the first comparator winding through which the current from the reference capacitor passes, resulting in a current in that winding having frequency characteristics similar to those of the current passing through the second winding which is connect- ed to the inductance. This compensating current 15 derived from a reduc- ed replica of the applied high-voltage by deriving a voltage signal which is a function of the frequency fluctuation, producing an amplitude con- trolled reduced replica voltage using the frequency fluctuation voltage and converting the amplitude controlled voltage to the compensating cur- rent for the first comparator winding.

448415

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