Patents by Inventor Gunther Hobi

Gunther Hobi 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).

  • Gate control circuit for a GTO thyristor
    Patent number: 4868731
    Abstract: The circuit contains a separate firing and extinguishing circuit, each having a respective capacitive charge store for generating the firing and the extinguishing current pulses for a GTO thyristor. A fast switching element which can be directly activated via a push-pull stage is provided which, when activated, discharges a respective charge store via the gate-cathode path of the GTO thyristor. As a result, the GTO thyristor can be operated at a high cycle frequency of up to at least 12,000 Hz and can be used in audio frequency transmitters for ripple control systems.
    Type: Grant
    Filed: December 8, 1988
    Date of Patent: September 19, 1989
    Assignee: Zellweger Uster AG
    Inventor: Gunther Hobi