Patents by Inventor Xi Junnan

Xi Junnan 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).

  • Brushless direct current monophase motor drive circuit
    Patent number: 6933688
    Abstract: A brushless direct current motor drive circuit having a serially connected motor coil energizing circuit, a serially connected feedback circuit, a pre-drive circuit, a position sensor, and a duty ratio controller. This circuit can decrease the heat generation from the switching elements on the power source side, perform absorption of the current flowing back in the direction of the switching elements on the power source side when the duty ratio is set to less than 100% without using an electrolytic capacitor group that causes a shortening of the motor lifetime, and solve various problems caused by the use of an electrolytic capacitor group.
    Type: Grant
    Filed: May 16, 2003
    Date of Patent: August 23, 2005
    Assignee: Minebea Co., Ltd.
    Inventors: Xi Junnan, Mitsuo Konno
  • Brushless direct current monophase motor drive circuit
    Publication number: 20040004453
    Abstract: A brushless direct current motor drive circuit having a serially connected motor coil energizing circuit, a serially connected feedback circuit, a pre-drive circuit, a position sensor, and a duty ratio controller. This circuit can decrease the heat generation from the switching elements on the power source side, perform absorption of the current flowing back in the direction of the switching elements on the power source side when the duty ratio is set to less than 100% without using an electrolytic capacitor group that causes a shortening of the motor lifetime, and solve various problems caused by the use of an electrolytic capacitor group.
    Type: Application
    Filed: May 16, 2003
    Publication date: January 8, 2004
    Inventors: Xi Junnan, Mitsuo Konno