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Electrical mean square voltage sensor

  • US 4,218,627 A
  • Filed: 09/01/1978
  • Issued: 08/19/1980
  • Est. Priority Date: 09/01/1978
  • Status: Expired due to Term
First Claim
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1. An electrical sensor circuit for producing an electrical output signal parameter corresponding to the mean square of an applied alternating voltage, said sensor comprising:

  • input terminals for receiving the applied AC voltage;

    zener diode means, for receiving the applied alternating voltage and for providing a reverse zener voltage breakdown characteristic less than the maximum amplitude of the applied AC voltage;

    light-emitting diode means in series electrical connection with respect to said zener diode means for providing a forward biased conduction path upon the breakdown of said reverse zener diode voltage by the applied alternating voltage; and

    inactive photoresponsive resister means optically coupled with respect to said light-emitting diode means for receiving electroluminescence emitted therefrom in response to said current flow through said light-emitting diode means, the resistance of said photoconductor means thereby varying as a function of the mean square of the applied alternating voltage.

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