Patents by Inventor Tomokazu Furuno

Tomokazu Furuno 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).

  • PWM motor drive device
    Patent number: 9871475
    Abstract: A PWM motor drive device includes: a time counter that counts a time of a polarity of a motor phase signal; a register that retains the time; a zone setting circuit that splits the time into arbitrary zones and generates an arbitrary zone set for which a phase of motor current is adjusted; and a zone correction circuit that compares a motor current phase signal indicating the phase of the motor current with the motor phase signal to correct the zone set.
    Type: Grant
    Filed: February 27, 2017
    Date of Patent: January 16, 2018
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Katsuyuki Tabata, Tomokazu Furuno, Masayoshi Igarashi, Shinichi Kuroshima
  • PWM MOTOR DRIVE DEVICE
    Publication number: 20170170756
    Abstract: A PWM motor drive device includes: a time counter that counts a time of a polarity of a motor phase signal; a register that retains the time; a zone setting circuit that splits the time into arbitrary zones and generates an arbitrary zone set for which a phase of motor current is adjusted; and a zone correction circuit that compares a motor current phase signal indicating the phase of the motor current with the motor phase signal to correct the zone set.
    Type: Application
    Filed: February 27, 2017
    Publication date: June 15, 2017
    Inventors: KATSUYUKI TABATA, TOMOKAZU FURUNO, MASAYOSHI IGARASHI, SHINICHI KUROSHIMA
  • Method and apparatus for PWM drive
    Patent number: 7358696
    Abstract: During PWM control in which an actuator (9) is connected between the output terminals of a bridge circuit made up of switching elements (121, 122, 221, 222) and power is applied to the actuator (9) with signals G1U, G1L, G2U and G2L, driving timing signals are generated with a time interval (dead time) during which the switching elements (121, 122) and the switching elements (221, 222) are simultaneously turned off, and the actuator (9) is driven so as to have no overlapping dead time between a pair of half-bridge circuits, achieving response even with a differential input PWM signal (S51-S52) having a small time difference.
    Type: Grant
    Filed: August 15, 2006
    Date of Patent: April 15, 2008
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Ayako Iwanaga, Tomokazu Furuno
  • Method and apparatus for PWM drive
    Publication number: 20070053670
    Abstract: During PWM control in which an actuator (9) is connected between the output terminals of a bridge circuit made up of switching elements (121, 122, 221, 222) and power is applied to the actuator (9) with signals G1U, G1L, G2U and G2L, driving timing signals are generated with a time interval (dead time) during which the switching elements (121, 122) and the switching elements (221, 222) are simultaneously turned off, and the actuator (9) is driven so as to have no overlapping dead time between a pair of half-bridge circuits, achieving response even with a differential input PWM signal (S51-S52) having a small time difference.
    Type: Application
    Filed: August 15, 2006
    Publication date: March 8, 2007
    Applicant: Matsushita Electric Industrial Co., Ltd.
    Inventors: Ayako Iwanaga, Tomokazu Furuno