Patents by Inventor Brad E. Andersen

Brad E. Andersen 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).

  • Alarm limit recentering arrangement for maintaining uniform alarm limit tolerances about a sloping regulation characteristic
    Patent number: 4562548
    Abstract: A microcomputer surveillance system is operative to monitor the output signal of a power supply to determine if an alarm limit has been reached and to center the alarm limits around an operating point of the power supply. Sensed output signals are converted to signal frequencies and transmitted optically to counters which accumulate counts indicative of the output signal. A microcomputer controller uses these counts to set alarm limits and determine if an alarm limit has been exceeded.
    Type: Grant
    Filed: May 12, 1983
    Date of Patent: December 31, 1985
    Assignee: AT&T Bell Laboratories
    Inventors: Brad E. Andersen, Billy H. Hamilton, Robert E. Schroeder
  • Current flare out limit control for PWM converter
    Patent number: 4357572
    Abstract: A pulse-width modulated current regulator (FIG. 4) includes a current flare out control (406,407,409,412) to limit current output at low output voltages. Current variation in an output filter inductor (408) is monitored and compared with a reference standard (407). A conduction interval is controlled in response to the comparison in order to limit current flare out.
    Type: Grant
    Filed: March 26, 1981
    Date of Patent: November 2, 1982
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventors: Brad E. Andersen, Billy H. Hamilton, Robert E. Schroeder