Source quality monitoring system

  • US 5,555,182 A
  • Filed: 05/04/1995
  • Issued: 09/10/1996
  • Est. Priority Date: 05/04/1995
  • Status: Expired due to Term
First Claim
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1. Monitoring apparatus for detecting phase and magnitude disruptions in an alternating voltage input signal comprising:

  • a) an input circuit for receiving an alternating voltage input signal and providing a first alternating output signal that follows a phase of the alternating voltage input signal and for providing a second alternating output signal phase shifted in relation to the first alternating output signal by a specified amount;

    b) a demodulation circuit for combining the first output signal from the input circuit with the alternating voltage input signal to produce a first demodulated signal and for combining the second alternating output signal from the input circuit with the alternating voltage input signal to produce a second demodulated signal, said demodulation circuit including circuitry for removing a ripple signal resulting from the combining of signals applied to the demodulation circuit; and

    c) an output circuit coupled to the demodulation circuit for assessing the quality of the alternating voltage input signal by comparing the first and second demodulated signals with predetermined quality thresholds to produce an output indication of the quality of the alternating voltage input signal.

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