Patents by Inventor Kefas Damazio-Coelho

Kefas Damazio-Coelho 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: 9882503
    Abstract: A converter system comprises two phase modules, each phase module comprising a first converter leg and a second converter leg interconnected with a DC link, and a charging transformer for charging the DC link. The DC link comprises two capacitors connected in series between a positive point, a middle point and a negative point, each converter leg adapted for interconnecting an output with the positive point, the middle point or the negative point of the DC link. The phase modules are connected in series via outputs of the converter legs, such that a second converter leg of a lower phase module is connected with a first converter leg of a higher phase module. The charging transformer is connected to the middle point of the DC link of a highest phase module, which provides a phase output of the converter system with an output of a second converter leg. The converter system includes two converter phases, each converter phase comprising at least two series connected phase modules.
    Type: Grant
    Filed: February 27, 2017
    Date of Patent: January 30, 2018
    Assignee: ABB Technology Oy
    Inventors: Juerg Rauchenstein, Kefas Damazio-Coelho, Matthias Lüscher
  • Publication number: 20170170742
    Abstract: A converter system comprises two phase modules, each phase module comprising a first converter leg and a second converter leg interconnected with a DC link, and a charging transformer for charging the DC link. The DC link comprises two capacitors connected in series between a positive point, a middle point and a negative point, each converter leg adapted for interconnecting an output with the positive point, the middle point or the negative point of the DC link. The phase modules are connected in series via outputs of the converter legs, such that a second converter leg of a lower phase module is connected with a first converter leg of a higher phase module. The charging transformer is connected to the middle point of the DC link of a highest phase module, which provides a phase output of the converter system with an output of a second converter leg. The converter system includes two converter phases, each converter phase comprising at least two series connected phase modules.
    Type: Application
    Filed: February 27, 2017
    Publication date: June 15, 2017
    Inventors: Juerg Rauchenstein, Kefas Damazio-Coelho, Matthias Lüscher
  • Patent number: 9025351
    Abstract: An exemplary converter circuit has a converter unit with plural actuatable power semiconductor switches, and the DC voltage side of which is connected to a capacitive energy storage circuit. The capacitive energy storage circuit has at least one capacitive energy store and at least one snubber network for limiting the rate of current or voltage rise on the actuatable power semiconductor switches of the converter unit. In order to reduce undesirable oscillations in an overcurrent in the capacitive energy storage circuit, the capacitive energy storage circuit has at least one passive nonactuatable damping unit having a unidirectional current-flow direction, where the passive nonactuatable damping unit has a diode and a damping resistor.
    Type: Grant
    Filed: April 5, 2013
    Date of Patent: May 5, 2015
    Assignee: ABB Technology AG
    Inventors: Kefas Damazio-Coelho, Matthias Luescher, Oscar Apeldoorn, Thomas Berner