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Intelligent Electronic Device Having Circuitry for Reducing the Burden on Current Transformers

  • US 20090072813A1
  • Filed: 09/16/2008
  • Published: 03/19/2009
  • Est. Priority Date: 09/19/2007
  • Status: Active Grant
First Claim
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1. A current sensor comprising:

  • a transformer including a primary winding configured for sensing a current delivered to a load and a secondary winding configured for outputting a scaled current; and

    an amplification circuit configured for variably amplifying the scaled output current and maintaining the output of the secondary winding at near zero voltage.

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