Transducer and related circuitry

Details Transducer and related circuitry Transducer and related circuitry

1987-08-17

1989-10-17

Zazworsky, John

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307261, 307494, 328144, H03K 500

Patent

active

048750166

ABSTRACT:
A transducer which converts an analog input signal into an analog output signal whose level corresponds to the level of the analog input contains an A/D converter and comparison means for indicating when the value of digital A/D output exceeds or falls below certain limits and includes an AC effective value-DC conversion circuit which avoids expensive square root circuitry while providing accurate conversion. A rectified voltage and a feedback voltage are applied to a current squaring circuit whose output is applied to an averaging circuit. The squaring circuit has a first conversion means for generating a current proportional to the rectified input and a second conversion means for dividing the sum of the rectified and feedback voltages, and converting the result to a rectified current. The currents are then summed and supplied to the averaging means.

REFERENCES:
patent: 3564389 (1971-02-01), Richman
patent: 3628160 (1971-12-01), Pickering
patent: 3652945 (1972-03-01), Nakane et al.
patent: 3795868 (1974-03-01), Ohme et al.
patent: 4494183 (1985-01-01), Bayer et al.
patent: 4494399 (1985-01-01), Youngman
patent: 4644478 (1987-02-01), Stephens et al.
Measurement Techniques, vol. 23, No. 5, May 1980, pp. 454-457, Plenum Publ. Corp., New York, US N. N. Zhelbakov et al.: Transducer of Effective AC into DC Voltages, FIGS. 1, 2.
IEEE Transactions on Instrumentation and Measurement, vol. IM-20, No. 4, Nov. 1971, pp. 313-319, IEEE, New York, US P. Richman et al.: A New Fast Computing RMS-to-DC Conversion, pp. 313-319.
Electronique et Microelectronique Industrielles, No. 151, Feb. 15, 1972, pp. 49-53, J. C. Maillet: Circuit de Mesure de la Valeur Efficace d'Un Signal Electrique.
IBM Technical Disclosure Bulletin, vol. 14, No. 2, Jul. 1971, pp. 523-524, New York, US, H. A. Higuchi: Active Equivalent Series Resistance Filter--Whole Article.
Electrical World, vol. 185, No. 12, Jun. 15, 1976, pp. 137-138, McGraw Hill Pub. Co., New York, US, Data-Acquisition System.
JP-A-60-111 166 (Takemoto Denki Keiki K.K.) Abstract.
JP-A-59 43 408 (Tokyo Shibaura Denki K.K.) 10-03-1984 Abstract.

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