Magnetek, Inc.

Dennis C Nolan

David A Bluma

A ripple rejection filter for removing the fundamental frequency of load voltage from control signals in closed-loop phase controlled systems operating from an AC power source. A low-pass filter is connected in parallel with a firing point synchronized sample and hold and high-pass filter series combination. The output of the low-pass and high-pass filters are combined to produce a resulting signal representative of an input signal but with ripple rejected.

Ripple rejection filter

A method and apparatus for digital phase synchronization to an AC power line is disclosed, having an analog-to-digital conversion providing a digital phase error signal which is processed by an inverting proportional plus integral transfer function and compared to a digital timer to determine the time for the next analog-to-digital conversion.

Digital phase synchronizer

A method and apparatus for operating a DC motor controller according to a first gain when the armature current of the DC motor is discontinuous, according to a second gain when the armature current is continuous, and according to a third gain when the armature current is in transition from the discontinuous to continuous conduction. The gains have proportional and integral terms and the integral term in the discontinuous and transition regions varies inversely to a current reference in the controller.

DC motor adaptive controller apparatus

A method for operating a DC motor controller according to a first gain when the armature current of the DC motor is discontinuous, according to a second gain when the armature current is continuous, and according to a third gain when the armature current is in transition from the discontinuous to continuous conduction. The gains have proportional and integral terms and the integral term in the discontinuous and transition regions varies inversely to a current reference in the controller.

Growing community of inventors

West Allis, WI, United States of America

Dennis C Nolan