Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Plural inputs
Patent
1985-01-09
1988-11-29
Smith, Jerry
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Plural inputs
364841, G01R 2200
Patent
active
047884940
ABSTRACT:
Apparatus for measuring the mean value of instantaneous power supplied to an electrical device computes the product of two voltage signals each proportional to the instantaneous voltage and current respectively. A self-biasing current source generates a DC signal current proportional to the magnitude of one voltage signal with a mean value equal to one-half the peak-to-peak magnitude of the voltage signal. A log-antilog multiplier circuit computes the product of the DC current signal and the other input voltage signal. A current mirror connected to the multiplier cancels DC offset currents to improve accuracy of the apparatus.
REFERENCES:
patent: 3304419 (1967-02-01), Huntley, Jr. et al.
patent: 3448297 (1969-06-01), Rhodes
patent: 3532868 (1970-10-01), Embly
patent: 3629567 (1971-12-01), Bruggemann
patent: 3662187 (1972-05-01), Ayres et al.
patent: 3689752 (1972-09-01), Gilbert
patent: 3714462 (1973-01-01), Blackmer
patent: 3764908 (1973-10-01), Elms
patent: 3805092 (1974-04-01), Henson
patent: 3961257 (1976-06-01), Milkovic
patent: 4004141 (1977-01-01), Curtis
patent: 4042815 (1977-08-01), Brown et al.
patent: 4156283 (1979-05-01), Gilbert
patent: 4165485 (1979-08-01), Takahashi
patent: 4316107 (1982-02-01), Talbot
Jung, W., "I.C. Op Amp Cookbook", 3rd. Ed., 1986.
IEEE Journal of Solid-State Circuits, Gilbert, B., "A High Performance Monolithic Multiplier Using Active Feedback", Dec. 1974, pp. 364-373.
Richardson, J. et al., "Measurement of Pulse Energy", Electronic Equipment News, Jun. 1970, pp. 12-21.
Faulkner, E. et al., "New Type of Analog Multiplier with Wide Dynamic Range", Electronics Letters, Mar. 23, 1972, vol. 8, No. 6, pp. 145-146.
Baker Stephen M.
Refac Electronics Corporation
Smith Jerry
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