Patents by Inventor Toshiki Kurosu

Toshiki Kurosu 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).

  • Temperature sensing circuit for voltage drive type semiconductor device and temperature sensing method therefore, and drive-device and voltage drive type semiconductor device using the same
    Patent number: 6288597
    Abstract: In order to provide a highly accurate and reliable temperature sensing circuit and method, a resistor (10a) having a positive temperature coefficient is connected between the gate terminal (4) and the insulated gate electrode (8a) of the voltage drive type semiconductor device (1a), and the temperature is sensed based on a voltage representing a voltage drop across the resistor in a circuit portion between the gate terminal (4) and the other terminal (5).
    Type: Grant
    Filed: October 12, 1999
    Date of Patent: September 11, 2001
    Assignees: Hitachi, Ltd., Hitachi Haramachi Electronics Co., Ltd.
    Inventors: Hiroyuki Hasegawa, Toshiki Kurosu, Shigeru Sugayama
  • Parallel circuit module including a diode and an IGBT
    Patent number: 5274541
    Abstract: In a module using a high-speed switching element such as an IGBT for a high-speed inverter, a matching condition is established between the switching characteristic of the IGBT and the recovery characteristic of the diode to be connected thereto in an anti-parallel fashion. As a result, the oscillating voltage appearing in the inverter circuit is suppressed to prevent erroneous operation of the inverter system.
    Type: Grant
    Filed: December 20, 1990
    Date of Patent: December 28, 1993
    Assignee: Hitachi, Ltd.
    Inventors: Shin Kimura, Yasuo Matsuda, Norikazu Tokunaga, Mutsuhiro Mori, Toshiki Kurosu, Yutaka Suzuki, Naoki Sakurai, Yasumichi Yasuda, Tomoyuki Tanaka, Kenichi Onda
  • Portion of power module for power inverter
    Patent number: D598846
    Type: Grant
    Filed: February 26, 2009
    Date of Patent: August 25, 2009
    Assignee: Hitachi, Ltd.
    Inventors: Toshiya Satoh, Ryuichi Saito, Toshiki Kurosu, Michiaki Hiyoshi, Kinya Nakatsu, Katsunori Azuma