Miscellaneous active electrical nonlinear devices – circuits – and – Specific input to output function – Exponential
Patent
1993-06-25
1995-09-12
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific input to output function
Exponential
327355, 327358, 327359, 327361, 327562, 327563, 327336, 327339, 327345, G06F 7556
Patent
active
054500290
ABSTRACT:
An estimating circuit for application in estimating or deriving the value V.sub.rms.sup.2 or V.sub.peak.sup.2, of a line voltage V.sub.AC provides fast response time and a substantially ripple free value for these signals by the utilization of a controlled harmonic oscillator whose output precisely tracks the input voltage waveform. Two out of phase (by .pi./2) sine wave signals are derived from the input sine wave and these two out of phase signals are squared and summed to derive or estimate the desired square of the sine waveform signal at a fast response time while substantially excluding ripple of the estimated out of phase sine waves. An estimating circuit, described herein, comprises two integrator circuits series connected into a substantially closed loop. The output of the second integrator circuit is fed back to the input of the first integrator circuit. The output of each individual integrator circuit is a voltage sine wave separated in phase from the output of the other integrator by .pi./2 and in synchronism with the input substantially sine wave voltage V.sub.AC. The output of each of the integrator circuits is squared in an associated squaring circuit. Each output of one of the two squaring circuits is summed with the output of the other squaring circuit to produce the desired value of V.sub.peak.sup.2 or V.sub.rms.sup.2.
REFERENCES:
patent: 3543288 (1970-11-01), Collings
patent: 3681700 (1972-08-01), Rennick
patent: 4005283 (1977-01-01), Rhodes
patent: 4222096 (1980-09-01), Capewell
patent: 4412277 (1983-10-01), Mitchell
patent: 4435677 (1984-03-01), Thomas
patent: 4585961 (1986-04-01), Daubert
patent: 4677366 (1987-06-01), Wilkinson et al.
patent: 4835421 (1989-05-01), Khoury et al.
patent: 5315260 (1994-05-01), Link et al.
"Power Factor Correction with the UC3854," Unitrode Application Note, C. de S. e Silva, 1991.
"High Power Factor Preregulators for Off-Line Power Supplies," Unitrode "Switching Regulator Power Supply Design Seminar Manual", Lloyd Dixon, Paper 12, 1991.
"High Power Factor Switching Preregulator Design Optimization," Unitrode Switching Regulator Power Supply Design Seminar Manual, Lloyd Dixon, Paper 13, 1991.
"Fast Controllers for High Power Factor AC-DC Converters," Proceedings of IEEE, Stankovic, Verghese, Liu, Thottuvelil, Firenze, 1991.
"A Digital Controller for a Unity Power Factor Controller," Workshop on Computers in Power Electronics, Mitwalli, Leeb, Verghese, Thottuvelil, Berkeley, Calif., Aug., 1992.
"Linear System Theory and Design", C. T. Chen, 1984, p. 354.
"High Speed Control of Sinusoidal Input Current Converters for Minimal Energy Storage Requirements", B. Carsten, PCIM, Sep. 1987, pp. 196-303.
"Optimum Input and Output Filters for a Single-Phase Rectifier Power Supply," S. B. Dewan, IEEE Tr. Ind. App., vol. 1A-17, No. 3 May/Jun., 1981, pp. 282-208.
"Kalman Filter Based High Speed Measurement and Control of AC Voltages for UPS Application", Sivakumer, S., Nataram, K., pp. 907-912.
IEEE Tr. Instrumentation and Measurement, vol. 1M-34, No. 3, Sep. 1985, pp. 413-417, "Microprocessor Implementation of a Fast and Simultaneous Amplitude and Frequency Detector for Sinusoidal Signals", Mahmood, M. K., Allos, J. E., Abdul-Karim, M. A. H.
IEEE Tr. on Industrial Electronics, vol. 39, No. 1, Feb. 1992, pp. 74-79, "Transient Response of a Peak Voltage Detector for Sinusoidal Signals", Chu, H-Y., Jou, H-Y., Huang, C-L.
Farrington Richard W.
Jacobs Mark E.
Wilkinson William P.
AT&T Corp.
Callahan Timothy P.
Phan Trong
Steinmetz Alfred G.
LandOfFree
Circuit for estimating a peak or RMS value of a sinusoidal volta does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Circuit for estimating a peak or RMS value of a sinusoidal volta, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Circuit for estimating a peak or RMS value of a sinusoidal volta will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-407857