Richard W Pierson

US Patent:

8134354, Mar 13, 2012

Filed:

Mar 3, 2009

Appl. No.:

12/396975

Inventors:

Benjamim Tang - Ranchos Palos Verdes CA, US
Robert T. Carroll - Andover MA, US
Scott W. Southwell - Seal Beach CA, US
Kenneth A. Ostrom - Palos Verdes Estates CA, US
Richard C. Pierson - Newport Beach CA, US

International Classification:

G05F 1/59

US Classification:

323283, 323272, 323284

Abstract:

Disclosed is a multi-phase pulse width modulated voltage regulator and method in which transient voltage excursions or deviations that exceed the load line voltage by more than a predetermined amount are detected by an ATR circuit and a correction signal is applied. The correction signal is in the form of asynchronous pulses and the number of such pulses is a function of the magnitude of the voltage excursion as determined by the number of thresholds that are exceeded. Also disclosed is an adaptive voltage positioning (AVP) circuit and method for early detection of a transient event by sensing voltage changes at the load and adjusting the target voltage with pre-determined current values prior to the time that ATR event changes in the current at the load are detected. The AVP load line is pre-positioned for more precise current control. Also disclosed is an adaptive filter with adjustable frequency characteristics in response to an ATR event.