Patents Assigned to Rickhtek Tecnology Corp.
  • Using offset cancellation circuit to mitigate beat-frequency oscillation of phase currents in a multiphase interleaved voltage regulator
    Patent number: 8525497
    Abstract: For a multiphase interleaved voltage regulator, an offset cancellation circuit is applied for each phase separately. The current loop gain of each phase is thus increased to mitigate the beat-frequency oscillation in phase currents when the beat frequency is below the bandwidth of the low-pass filter in the offset cancellation circuit, without introducing additional instability issue that is the drawback of increasing current-sensing gain.
    Type: Grant
    Filed: February 1, 2011
    Date of Patent: September 3, 2013
    Assignee: Rickhtek Tecnology Corp.
    Inventors: Chen-Hua Chiu, Ching-Jan Chen, Dan Chen, Wei-Hsu Chang