Patents by Inventor Kenichi FUKUNO

Kenichi FUKUNO 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: 11456594
    Abstract: In the conventional elimination of a short-circuited point by using fuses, due to the fuse characteristics, it is not possible to ensure cooperation at the respective melting times of fuses in a short-circuit state. To solve such a problem, provided are a converter which limits a current passing through a distribution line in a short-circuit state and has a constant power drooping characteristic of passing a current greater than or equal to a rated current through the distribution line for a fixed time, and relays which have an operating characteristic of detecting a current greater than or equal to the rated current and hierarchically opening switches within the fixed time.
    Type: Grant
    Filed: January 28, 2019
    Date of Patent: September 27, 2022
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventor: Kenichi Fukuno
  • Publication number: 20220247173
    Abstract: A DC power distribution system includes: a transformer; a rectification device; a DC bus through which DC power flows; a plurality of DC branch lines branching off from the DC bus; an AC interrupting portion connected to an input side of the transformer; a first DC interrupting portion connected between the rectification device and the DC bus; and a plurality of second DC interrupting portions respectively provided to the plurality of DC branch lines. An interrupting-operation time for each second DC interrupting portion is set to be shorter than interrupting-operation times for the AC interrupting portion and the first DC interrupting portion. An inductance value of a short-circuit impedance of the transformer is set to a value at which short-circuit current can be limited to take a value not larger than a maximum current value permitted for the rectification device.
    Type: Application
    Filed: June 5, 2020
    Publication date: August 4, 2022
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Hayato TAKEUCHI, Kenichi FUKUNO, Takaharu ISHIBASHI, Takushi JIMICHI
  • Publication number: 20220190592
    Abstract: An object is to provide a DC distribution panel that, even when short-circuit current has occurred in one feeder, interrupts only the feeder where short-circuit current has occurred, and thus can continue operations of load apparatuses connected to normal feeders. This DC distribution panel includes: an input terminal including positive and negative input terminals; circuit breakers having short-circuit current interruption units connected to at least either of positive electric paths and negative electric paths respectively branched from the positive and negative input terminals; and output terminals including positive output terminals and negative output terminals of the plurality of circuit breakers. At least one of the plurality of circuit breakers includes a reverse current interruption unit for interrupting reverse current flowing through the positive electric path from the output terminal side to the input terminal side.
    Type: Application
    Filed: July 11, 2019
    Publication date: June 16, 2022
    Applicant: Mitsubishi Electric Corporation
    Inventors: Kenichi FUKUNO, Takushi JIMICHI
  • Publication number: 20210313797
    Abstract: In the conventional elimination of a short-circuited point by using fuses, due to the fuse characteristics, it is not possible to ensure cooperation at the respective melting times of fuses in a short-circuit state. To solve such a problem, provided are a converter which limits a current passing through a distribution line in a short-circuit state and has a constant power drooping characteristic of passing a current greater than or equal to a rated current through the distribution line for a fixed time, and relays which have an operating characteristic of detecting a current greater than or equal to the rated current and hierarchically opening switches within the fixed time.
    Type: Application
    Filed: January 28, 2019
    Publication date: October 7, 2021
    Applicant: Mitsubishi Electric Corporation
    Inventor: Kenichi FUKUNO