Linear A.C. measurements

Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons

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307235R, 307261, 321 8R, 324120, 328150, H02M 700, H03K 500

Patent

active

040016978

ABSTRACT:
A highly linear AC to DC conversion system comprises a variable gain amplifier via which an AC signal to be converted is applied to an AC/DC converter. The output of the AC/DC converter is compared with a reference level and a control signal dependent on the difference therebetween adjusts the gain of the variable gain amplifier so as to reduce the difference. The output of the AC/DC converter is also applied to one input of a comparator, whose DC output is applied via the variable gain amplifier to the other input of the comparator. The variable gain amplifier has exactly the same gain for both AC and DC signals. It can then be shown that the DC output signal produced by the comparator is very accurately linearly related to the magnitude of the AC input signal.

REFERENCES:
patent: 3571706 (1971-03-01), Bjor
patent: 3652945 (1972-03-01), Nakane et al.
patent: 3723845 (1973-03-01), Duckworth

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