Patents by Inventor Johannes Yntema

Johannes Yntema 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).

  • Switched-mode power supply with compensation for varying input voltage
    Patent number: 5757629
    Abstract: In a switched-mode power supply a coil is periodically connected across an input voltage by means of a switching element. The switching element is turned off when the voltage across a sensing resistor in series with the switching element exceeds a given threshold. The threshold is reached sooner when the input voltage increases. This effect is compensated by an inductive element in series with the sensing resistor, through which inductive element the same current flows as through the sensing resistor.
    Type: Grant
    Filed: February 6, 1997
    Date of Patent: May 26, 1998
    Assignee: U.S. Philips Corporation
    Inventors: Johannes Yntema, Schelte Heeringa, Wilhelmus G. M. Ettes