Patents by Inventor Tamotsu Ninomiya

Tamotsu Ninomiya 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).

  • Resonant DC-DC converter capable of controlling by pulse width modulation
    Patent number: 5805432
    Abstract: In a resonant DC-DC converter for converting a d.c. input voltage into a d.c. output voltage, a main switching element (3) switches the d.c. input voltage under control of switching pulses to supply an a.c. voltage to a primary side of a transformer (4). A resonant circuit (5) is provided at a secondary side of the transformer. A clamp circuit is connected to the main switching element and comprises a first capacitor (2-1) and an auxiliary switching element (2-2) serially connected to the first capacitor. The main and the auxiliary switching elements are alternately put into an on state under control of the switching pulses.
    Type: Grant
    Filed: April 25, 1996
    Date of Patent: September 8, 1998
    Assignee: NEC Corporation
    Inventors: Toshiyuki Zaitsu, Tamotsu Ninomiya