Patents by Inventor Hitoshi Tanifuji

Hitoshi Tanifuji 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 converter and refrigerating and air-conditioning apparatus
    Patent number: 9136757
    Abstract: A power converter includes step-up means for varying a voltage applied by a power supply to a predetermined voltage, commutating means for performing a commutation operation for allowing a current flowing through the step-up means to flow through a second path, smoothing means for smoothing a voltage related to outputs of the step-up means and the commutating means to produce power and supplying the power to a load side, and control means for performing control related to voltage varying, such as stepping up, by the step-up means and controlling the commutation operation of the commutating means on the basis of at least one of a voltage and a current related to the step-up means.
    Type: Grant
    Filed: November 4, 2010
    Date of Patent: September 15, 2015
    Assignee: Mitsubishi Electric Corporation
    Inventors: Koichi Arisawa, Takuya Shimomugi, Yosuke Shinomoto, Masato Handa, Mitsuo Kashima, Shigeo Umehara, Katsuhiko Saito, Norikazu Ito, Hitoshi Tanifuji, Makoto Tanikawa, Tomomi Higashikawa
  • POWER CONVERTER AND REFRIGERATING AND AIR-CONDITIONING APPARATUS
    Publication number: 20130152624
    Abstract: A power converter includes step-up means for varying a voltage applied by a power supply to a predetermined voltage, commutating means for performing a commutation operation for allowing a current flowing through the step-up means to flow through a second path, smoothing means for smoothing a voltage related to outputs of the step-up means and the commutating means to produce power and supplying the power to a load side, and control means for performing control related to voltage varying, such as stepping up, by the step-up means and controlling the commutation operation of the commutating means on the basis of at least one of a voltage and a current related to the step-up means.
    Type: Application
    Filed: November 4, 2010
    Publication date: June 20, 2013
    Applicant: MitsubishiI Electric Corporation
    Inventors: Koichi Arisawa, Takuya Shimomugi, Yosuke Shinomoto, Masato Handa, Mitsuo Kashima, Shigeo Umehara, Katsuhiko Saito, Norikazu Ito, Hitoshi Tanifuji, Makoto Tanikawa, Tomomi Higashikawa
  • Inverter control apparatus
    Patent number: 6687139
    Abstract: Provided are, a converter section (30) which converts a commercial AC voltage (VAC) into a DC voltage (VDC); an inverter section (60) which converts the DC voltage (VDC) into an output AC voltage (VOUT) of a predetermined frequency by a pulse-width modulation system based on an assigned PWM width, and supplies the output AC voltage (VOUT) to a compressor motor (70). Further, an instantaneous DC voltage detecting section (50) detects an instantaneous DC voltage (VDCS); and an arithmetic processing section (100) corrects the PWM width so as to maintain the output AC voltage (VOUT) at a desired value following the variation in the instantaneous DC voltage (VDCS). It is possible to operate a compressor motor (70) in an optimum state of load characteristics and efficiency.
    Type: Grant
    Filed: May 24, 2001
    Date of Patent: February 3, 2004
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Makoto Tanikawa, Takahiro Ishigami, Yoshihiko Kikkawa, Hitoshi Tanifuji, Yoshihiro Iwasaki, Hiroaki Suzuki, Isao Kawasaki, Ichiro Minejima
  • Inverter control apparatus
    Publication number: 20010036093
    Abstract: Provided are, a converter section (30) which converts a commercial AC voltage (VAC) into a DC voltage (VDC); an inverter section (60) which converts the DC voltage (VDC) into an output AC voltage (VOUT) of a predetermined frequency by a pulse-width modulation system based on an assigned PWM width, and supplies the output AC voltage (VOUT) to a compressor motor (70). Further, an instantaneous DC voltage detecting section (50) detects an instantaneous DC voltage (VDCS); and an arithmetic processing section (100) corrects the PWM width so as to maintain the output AC voltage (VOUT) at a desired value following the variation in the instantaneous DC voltage (VDCS). It is possible to operate a compressor motor (70) in an optimum state of load characteristics and efficiency.
    Type: Application
    Filed: May 24, 2001
    Publication date: November 1, 2001
    Applicant: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Makoto Tanikawa, Takahiro Ishigami, Yoshihiko Kikkawa, Hitoshi Tanifuji, Yoshihiro Iwasaki, Hiroaki Suzuki, Isao Kawasaki, Ichiro Minejima
  • Power transistor module packaging structure
    Patent number: 5946192
    Abstract: An apparatus which secures a heat sink to an electrical component connected to a circuit board, including a first outer cover which engages a portion of the heat sink and a portion of the circuit board. In addition, the first outer cover encloses the electrical component, and the electrical component has at least two pins, a first surface facing the circuit board, and a second surface facing the heat sink. Further, a majority of heat dissipating surfaces of the heat sink are outside a space enclosed by the first outer cover and the circuit board.
    Type: Grant
    Filed: July 31, 1997
    Date of Patent: August 31, 1999
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Takahiro Ishigami, Hitoshi Tanifuji, Yoshihiko Kikkawa, Yoshihiro Iwasaki, Hiroaki Suzuki, Makoto Tanikawa, Masahito Mori, Isao Kawasaki