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Method and apparatus for power measuring

  • US 5,450,007 A
  • Filed: 09/28/1993
  • Issued: 09/12/1995
  • Est. Priority Date: 09/19/1991
  • Status: Expired due to Fees
First Claim
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1. A method of generating a product of signals proportional to the voltage of an electrical supply and the current flowing through a load connected thereto, comprising the steps of deriving a first signal proportional to the said supply voltage, deriving a second signal proportional to the said load current, frequency modulating two constant frequency carrier signals by the said first and second signals to produce third and fourth signals respectively, normalising the third and fourth signals with reference to frequencies corresponding to zero voltage and zero current, and multiplying the two normalised third and fourth signals to form a product signal which is proportional to the power being absorbed by the load connected to the electrical supply.

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