Patents by Inventor Hongdan Fu

Hongdan Fu 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).

  • Pulse width modulation controller and method
    Patent number: 6775158
    Abstract: A PWM controller for an inverter includes a feedback circuit and a deadtime circuit for masking out of synchronization conditions which occur when the deadtime duration between switching the polarities of the desired output AC waveform is nearly equal to or longer than the duration of its PWM source waveform. The PWM controller for an inverter also includes a carrier range regulation circuit for reducing loss of the PWM duty cycle to prevent compromising the frequency spectrum of the desired AC waveform without requiring complicated software or additional CPU or DSP processing time.
    Type: Grant
    Filed: September 16, 2002
    Date of Patent: August 10, 2004
    Assignees: Sodick Co. Ltd., Sodick America Corporation
    Inventor: Hongdan Fu
  • Pulse width modulation controller and method
    Publication number: 20040052096
    Abstract: A PWM controller for an inverter includes a feedback circuit and a deadtime circuit for masking out of synchronization conditions which occur when the deadtime duration between switching the polarities of the desired output AC waveform is nearly equal to or longer than the duration of its PWM source waveform. The PWM controller for an inverter also includes a carrier range regulation circuit for reducing loss of the PWM duty cycle to prevent compromising the frequency spectrum of the desired AC waveform without requiring complicated software or additional CPU or DSP processing time.
    Type: Application
    Filed: September 16, 2002
    Publication date: March 18, 2004
    Applicant: Sodick America Corporation
    Inventor: Hongdan Fu