Patents by Inventor Tatsuji KATAYAMA

Tatsuji KATAYAMA 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).

  • Power conversion device
    Patent number: 11166397
    Abstract: A power conversion device includes: a casing including a housing portion; a circuit board housed in the housing portion, the circuit board including an inverter circuit or an inverter control circuit configured to control the inverter circuit; a cooling fan configured to generate air flowing through the housing portion to cool the circuit board; a temperature sensor configured to sense a temperature inside or outside the casing; and a cooling fan control circuit configured to drive the cooling fan. The cooling fan control circuit is configured to, if the temperature sensed by the temperature sensor is higher than a predetermined temperature, turn on the cooling fan, and if the sensed temperature is equal to or below the predetermined temperature, control the cooling fan to turn off the cooling fan or make a speed of the flowing air lower than a speed when the cooling fan is in the on state.
    Type: Grant
    Filed: February 2, 2018
    Date of Patent: November 2, 2021
    Assignee: TOSHIBA MITSUBISHI—ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
    Inventors: Nobuhiro Takahashi, Tatsuji Katayama
  • POWER CONVERSION DEVICE
    Publication number: 20200367390
    Abstract: A power conversion device includes: a casing including a housing portion; a circuit board housed in the housing portion, the circuit board including an inverter circuit or an inverter control circuit configured to control the inverter circuit; a cooling fan configured to generate air flowing through the housing portion to cool the circuit board; a temperature sensor configured to sense a temperature inside or outside the casing; and a cooling fan control circuit configured to drive the cooling fan. The cooling fan control circuit is configured to, if the temperature sensed by the temperature sensor is higher than a predetermined temperature, turn on the cooling fan, and if the sensed temperature is equal to or below the predetermined temperature, control the cooling fan to turn off the cooling fan or make a speed of the flowing air lower than a speed when the cooling fan is in the on state.
    Type: Application
    Filed: February 2, 2018
    Publication date: November 19, 2020
    Applicant: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
    Inventors: Nobuhiro TAKAHASHI, Tatsuji KATAYAMA