Variable gain electronic current transformer

Details Variable gain electronic current transformer Variable gain electronic current transformer

G - Physics

01

R

324/58.1

G01R 19/02 (2006.01) G01R 19/10 (2006.01) G01R 21/08 (2006.01)

Patent

CA 1046584

ABSTRACT OF THE DISCLOSURE A variable gain electronic current transformer is disclosed which includes means for detecting the current flow into a power consuming system. An operational ampli- fier amplifies the detected current and the output of the operational amplifier is converted into a magnetic flux filed which is directed onto one surface of a Hall effect element. A variable current source supplies current to a second orthogonal surface of the Hall effect element to thereby generate an output voltage which is directly pro- portional to the product of the output of the operational amplifier and the variable current source. This output voltage from the Hall effect element is coupled back to the input of the operational amplifier. A second Hall effect element is positioned in the flux field generated at the output of the operational amplifier and in addition has a second variable current source coupled to one surface thereof so that the output of the second Hall effect element is a voltage which is proportional to the product of the output of the operational amplifier and the second variable current source. Accordingly, the output voltage of the second Hall effect element is directly proportio- nal to the product of the detected current and the output of the second current source and is inversely proportional to the output of the first variable current source to thereby provide a current transformer having a large dynamic range depending upon the variance of the outputs of the first and second variable current sources.

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