Detection and measurement of a DC component in an AC waveform

Details Detection and measurement of a DC component in an AC waveform Detection and measurement of a DC component in an AC waveform

1990-04-17

1991-10-08

Wieder, Kenneth A.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Nonlinear

324103P, 324111, 307351, G01R 2900, H03K 329

Patent

active

050557734

ABSTRACT:
DC offset is measured by separating the positive and negative half cycles of the AC waveform, obtaining a measure of the energy content of each type of half cycle and subtracting one from the other and accumulating the result. The accumulated result is measured against a threshold which is selected to have a known relationship to the units used to measure the DC offset. Each time the threshold is exceeded, this increments a counter and at the same time resets the accumulator. The contents of the counter can then be multiplied by an appropriate scaling factor. The square root of this result gives a measure of DC offset.

REFERENCES:
patent: 3257616 (1966-06-01), Andrushkiw et al.
patent: 3973197 (1976-08-01), Meyer
patent: 4166245 (1979-08-01), Roberts
patent: 4459546 (1984-07-01), Arrington et al.
patent: 4746816 (1988-05-01), Olesen
patent: 4943766 (1990-07-01), Suzuki
patent: 5003196 (1991-03-01), Kawaguchi

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