Detection of DC content in an AC waveform

Details Detection of DC content in an AC waveform Detection of DC content in an AC waveform

1981-01-15

1985-02-19

Karlsen, Ernest F.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Transient or portion of cyclic

307520, 324103P, 324107, 328165, 363 96, 363 97, 364575, G01R 1900, H04B 1500, H02P 1320

Patent

active

045008370

ABSTRACT:
The DC content of each phase of a three phase AC waveform is generated by partially filtering each phase and applying the filtered waveforms sequentially through a multiplexer to a sample and hold circuit which measures the instantaneous value of each phase at two points which are spaced an exact odd number of half-cycles apart. These instantaneous values are fed by an analog to digital converter into a microprocessor which averages the two readings to generate the DC content for each phase and compares the highest DC content with a threshold value. The excess of the highest DC content over the threshold value is integrated and an output signal is generated when the accumulated volt-seconds exceed a selected value.

REFERENCES:
patent: 1746935 (1930-02-01), Goodwin, Jr.
patent: 2624770 (1953-01-01), Yetter
patent: 3510753 (1970-05-01), Lawn
patent: 3988689 (1976-10-01), Ochi et al.
patent: 4305132 (1981-12-01), Tsuboshima et al.

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