Patents by Inventor Naotsugu Kako

Naotsugu Kako 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).

  • SEMICONDUCTOR DEVICE
    Publication number: 20240056071
    Abstract: A semiconductor device that normally-off drives a first transistor that normally-on drives, the semiconductor device includes a first circuitry, a second circuitry, and a first diode. The first circuitry that is connected with a power supply voltage and a ground voltage, detects the power supply voltage, and outputs a transition state of the power supply voltage. The second circuitry that is connected with the power supply voltage, the ground voltage, the first circuitry, and a second transistor, and outputs a drive voltage of a second transistor connected in series with the first transistor, based on an output of the first circuitry. The first diode having an anode connected with a drive terminal of the first transistor and a cathode connected with an output terminal of the second transistor.
    Type: Application
    Filed: October 25, 2023
    Publication date: February 15, 2024
    Inventors: Yasuyuki FUJIWARA, Yiyao LIU, Yusuke SATO, Naotsugu KAKO, Hideaki MAJIMA
  • Semiconductor device
    Patent number: 11838013
    Abstract: A semiconductor device that normally-off drives a first transistor that normally-on drives, the semiconductor device includes a first circuitry, a second circuitry, and a first diode. The first circuitry that is connected with a power supply voltage and a ground voltage, detects the power supply voltage, and outputs a transition state of the power supply voltage. The second circuitry that is connected with the power supply voltage, the ground voltage, the first circuitry, and a second transistor, and outputs a drive voltage of a second transistor connected in series with the first transistor, based on an output of the first circuitry. The first diode having an anode connected with a drive terminal of the first transistor and a cathode connected with an output terminal of the second transistor.
    Type: Grant
    Filed: May 31, 2022
    Date of Patent: December 5, 2023
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
    Inventors: Yasuyuki Fujiwara, Yiyao Liu, Yusuke Sato, Naotsugu Kako, Hideaki Majima
  • SEMICONDUCTOR DEVICE
    Publication number: 20220294443
    Abstract: A semiconductor device that normally-off drives a first transistor that normally-on drives, the semiconductor device includes a first circuitry, a second circuitry, and a first diode. The first circuitry that is connected with a power supply voltage and a ground voltage, detects the power supply voltage, and outputs a transition state of the power supply voltage. The second circuitry that is connected with the power supply voltage, the ground voltage, the first circuitry, and a second transistor, and outputs a drive voltage of a second transistor connected in series with the first transistor, based on an output of the first circuitry. The first diode having an anode connected with a drive terminal of the first transistor and a cathode connected with an output terminal of the second transistor.
    Type: Application
    Filed: May 31, 2022
    Publication date: September 15, 2022
    Inventors: Yasuyuki Fujiwara, Yiyao Liu, Yusuke Sato, Naotsugu Kako, Hideaki Majima
  • Semiconductor device
    Patent number: 11381237
    Abstract: A semiconductor device that normally-off drives a first transistor that normally-on drives, the semiconductor device includes a first circuitry, a second circuitry, and a first diode. The first circuitry that is connected with a power supply voltage and a ground voltage, detects the power supply voltage, and outputs a transition state of the power supply voltage. The second circuitry that is connected with the power supply voltage, the ground voltage, the first circuitry, and a second transistor, and outputs a drive voltage of a second transistor connected in series with the first transistor, based on an output of the first circuitry. The first diode having an anode connected with a drive terminal of the first transistor and a cathode connected with an output terminal of the second transistor.
    Type: Grant
    Filed: March 17, 2021
    Date of Patent: July 5, 2022
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION
    Inventors: Yasuyuki Fujiwara, Yiyao Liu, Yusuke Sato, Naotsugu Kako, Hideaki Majima
  • SEMICONDUCTOR DEVICE
    Publication number: 20220094353
    Abstract: A semiconductor device that normally-off drives a first transistor that normally-on drives, the semiconductor device includes a first circuitry, a second circuitry, and a first diode. The first circuitry that is connected with a power supply voltage and a ground voltage, detects the power supply voltage, and outputs a transition state of the power supply voltage. The second circuitry that is connected with the power supply voltage, the ground voltage, the first circuitry, and a second transistor, and outputs a drive voltage of a second transistor connected in series with the first transistor, based on an output of the first circuitry. The first diode having an anode connected with a drive terminal of the first transistor and a cathode connected with an output terminal of the second transistor.
    Type: Application
    Filed: March 17, 2021
    Publication date: March 24, 2022
    Inventors: Yasuyuki Fujiwara, Yiyao Liu, Yusuke Sato, Naotsugu Kako, Hideaki Majima