Patents by Inventor Mike C. Daskalos

Mike C. Daskalos 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).

  • Patent number: 8427173
    Abstract: Systems and methods are shown for detecting a blown fuse in a three-phase line by comparing neutral points in the line before and after the fuses. Diode rectifier circuits may be used to compare the neutral points and generate a DC output voltage when neutral points are off from one another, and photocoupler circuits may provide electrical isolation when signaling a neutral point shift. The neutral points compared need not be on immediate sides of the fuses, so intermediate components may exist, and in some embodiments one of the compared points may be within a load connected to the three-phase line.
    Type: Grant
    Filed: April 23, 2009
    Date of Patent: April 23, 2013
    Assignee: Toshiba International Corporation
    Inventors: Toshiaki Oka, Mike C Daskalos
  • Publication number: 20100271045
    Abstract: Systems and methods are shown for detecting a blown fuse in a three-phase line by comparing neutral points in the line before and after the fuses. Diode rectifier circuits may be used to compare the neutral points and generate a DC output voltage when neutral points are off from one another, and photocoupler circuits may provide electrical isolation when signaling a neutral point shift. The neutral points compared need not be on immediate sides of the fuses, so intermediate components may exist, and in some embodiments one of the compared points may be within a load connected to the three-phase line.
    Type: Application
    Filed: April 23, 2009
    Publication date: October 28, 2010
    Applicant: TOSHIBA INTERNATIONAL CORPORATION
    Inventors: Toshiaki Oka, Mike C Daskalos
  • Publication number: 20090251935
    Abstract: An 18n-pulse rectifier for AC drive systems having a separate DC bus for each output phase is provided, where n=any positive integer. The rectifier uses three separate phase rectifiers, one for each output phase of a transformer, each comprised of 2n six-pulse diode bridges connected in series or parallel. Each phase rectifier may be supplied with n unique sets of phase inputs from a transformer secondary winding. In some configurations, the n sets of inputs provided to each rectifier are separated by 60/n degrees of phase (when n is greater than 1), while the corresponding inputs to neighboring rectifiers are separated by 20/n degrees of phase. In a 36-pulse example, the phase offsets for the inputs provided to the rectifiers may be ?25° and +5° from the transformer primary winding (for the first rectifier), ?15° and +15° from the primary winding (for the second rectifier) and ?5° and +25° from the primary winding (for the third rectifier).
    Type: Application
    Filed: April 7, 2008
    Publication date: October 8, 2009
    Applicant: TOSHIBA INTERNATIONAL CORPORATION
    Inventors: John D. Kleinecke, Mike C. Daskalos, Takashi Morishita
  • Publication number: 20090251009
    Abstract: A transformer controller for a drive isolation transformer is provided. The transformer may include multiple sets of primary windings as an input, and the transformer controller may include multiple branches coupled between a power source and the transformer. Each branch may be coupled to its own primary winding on the transformer, and may include one or more components, such as an isolation switch, a fuse, contactor, or circuit breaker. One or more of the branches may include a pre-charge reactor to limit inrush or capacitor charging current occurring during startup, and may include a pre-charge contactor to remove the pre-charge reactor from the circuit when the startup process has reached a certain level (e.g., the charging or inrush current has dissipated, or a DC bus reaches a charged state).
    Type: Application
    Filed: April 7, 2008
    Publication date: October 8, 2009
    Applicant: TOSHIBA INTERNATIONAL CORPORATION
    Inventors: John D. Kleinecke, Mike C. Daskalos
  • Publication number: 20080112135
    Abstract: A heat-dissipating cabinet structure may use a heat exchanger mounted at a boundary between an interior cabinet portion and an exterior portion, and heat-generating devices medium-voltage devices (such as high isolation IGBT or diode devices) may be mounted on the interior portion of the heat exchanger. The IGBT or diode devices may be electrically grounded within the cabinet such that contact with the external portion of the heat exchanger does not compromise the required clearance and creepage distances between the device's terminals and its base. Heat dissipating elements (e.g., fins, coils, etc.) may be formed at the outside portion of the heat exchanger to facilitate dissipation. A fan may be used to drive airflow over the exterior portion of the heat exchanger (and its dissipation elements), and the airflow may be directed by an airflow housing.
    Type: Application
    Filed: November 10, 2006
    Publication date: May 15, 2008
    Applicant: Toshiba International Corporation
    Inventors: John D. Kleinecke, Mike C. Daskalos, Osamu Tanaka