William Sherwood Wilkinson

US Patent:

54500290, Sep 12, 1995

Filed:

Jun 25, 1993

Appl. No.:

8/083747

Inventors:

Mark E. Jacobs - Dallas TX
Richard W. Farrington - Mesquite TX
William P. Wilkinson - Rockwall TX

Assignee:

AT&T Corp. - Murray Hill NJ

International Classification:

G06F 7556

US Classification:

327348

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.

US Patent:

53919769, Feb 21, 1995

Filed:

Jul 28, 1993

Appl. No.:

8/098183

Inventors:

Richard W. Farrington - Mesquite TX
Mark E. Jacobs - Dallas TX
William P. Wilkinson - Rockwall TX

Assignee:

AT&T Corp. - Murray Hill NJ

International Classification:

G05F 170
H02M 114

US Classification:

323207

Abstract:

A power factor control system for a rectifier is operative through the generation of estimators of control input parameters (a peak squared input AC voltage E. sub. m. sup. 2 and load power) and by the use of these substantially ripple free signals controls a boost, buck, buck-boost, SEPIC or other related type converter at the input to the rectifier. The generation of these parameters allows the derivation of a programmed current i. sub. p used to control the wave form of the actual input current. The control procedure is based on a quarter cycle averaged power basis. The input power is derived from the rms values of the input voltage and current. Given the output power and its deviations in power due to load changes, the programmed current i. sub. p is determined by deriving an input conductance of the rectifier and combining it with the input voltage.

Address:

300 Shady Hl Dr, Richardson, TX 75080

Phone:

9722355571

VIN:

4JGBF71E07A238960

Make:

MERCEDES-BENZ

Model:

GL-CLASS

Year:

2007