Patents by Inventor Kenzo Okutsu

Kenzo Okutsu 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).

  • Neutral-point inverter
    Patent number: 6281636
    Abstract: A commercial power supply is connected to a rectifier DB through a low-pass filter LPF. A smoothing capacitor Cs, a series circuit consisting of voltage-dividing capacitors C1 and C2, and a series circuit consisting of switching elements Q1 and Q2 are connected in parallel to the output of the rectifier DB. Diodes D1 and D2 are connected in reverse parallel to the switching elements Q1 and Q2, respectively. A drive circuit DR is connected to the switching elements Q1 and Q2. Between a connecting point that is between the voltage-dividing capacitors C1 and C2 and a connecting point that is between the switching elements Q1 and Q2, a load circuit R consisting of a parallel circuit is connected. The parallel circuit includes an inductor Lo, a fluorescent lamp LT, and a resonance capacitor C4.
    Type: Grant
    Filed: December 21, 1998
    Date of Patent: August 28, 2001
    Assignee: Nippo Electric Co., Ltd.
    Inventors: Kenzo Okutsu, Koji Ebato, Yoshito Kato