Patents by Inventor Stewart C. Koch

Stewart C. Koch has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Controller for AC generator
    Patent number: 7327123
    Abstract: A control system that can accommodate the wide variations in the output of a generator, such as a permanent magnet alternator, while providing an output with relatively uniform phase ripple. The control system includes a zero crossing detector and variable ramp generator for generating control signals to a switching rectifier to generate a regulated DC signal.
    Type: Grant
    Filed: February 2, 2006
    Date of Patent: February 5, 2008
    Assignee: Magnetic Applications, Inc.
    Inventors: Ira S. Faberman, Stewart C. Koch, Charles Y. Lafontaine, Dave E. Williams, Harold C. Scott
  • Controller for permanent magnet alternator
    Patent number: 7176658
    Abstract: The invention is a control system that, among other things, controls a permanent magnet alternator and provides relatively accurate voltage regulation. The control system may include one or more of the following: (1) a rectification system to rectify and regulate the output voltage of an alternator, (2) a rectifier/limiter used as an electrical power source to a boost type regulator, (3) a multimode rectifier/limiter, (4) a DC to AC inverter bridge, and (5) power switches employed in the system to minimize the switching energy that would otherwise be dissipated in the power switches as heat.
    Type: Grant
    Filed: June 2, 2004
    Date of Patent: February 13, 2007
    Assignee: Magnetic Applications Inc.
    Inventors: Fazle Quazi, Harold C. Scott, Stewart C. Koch