Tracking filter for sensing DC content in an AC waveform

Details Tracking filter for sensing DC content in an AC waveform Tracking filter for sensing DC content in an AC waveform

1983-07-26

1985-12-03

Levy, Stewart J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Transient or portion of cyclic

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

Patent

active

045568421

ABSTRACT:
The DC content of an AC waveform is detected by a digital filter which partially filters each phase of the waveform and applies 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. The time interval between the measurement points is adjusted according to variations in the AC waveform frequency to maintain required spacing. The measured instantaneous values are fed by an analog to digital converter and to a microprocessor system which averages the two readings to generate a signal corresponding to the DC content for each phase.

REFERENCES:
patent: 4305132 (1981-12-01), Tsuboshima et al.
patent: 4318617 (1982-03-01), Orseu
patent: 4370702 (1983-01-01), Shuey et al.
patent: 4500837 (1985-02-01), Shuey et al.
Parasuramau, B., "Hardware Multiplication Techniques for Microprocessor Systems", Computer Design, Apr. 1977, pp. 75-82.

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