Patents Assigned to Ricktek Technology Corp.
  • Control circuit for switching loss reduction and smooth mode transition of a high efficiency buck-boost power converter
    Patent number: 8692533
    Abstract: A buck-boost power converter switches the switches thereof with a novel sequence and extends the switching periods of the switches to reduce the switching loss and conduction loss when the input voltage thereof approaches the output voltage thereof. The influence of the load current of the power converter on the duty thereof is taken into account to switch the power converter between modes at correct time points, so as to prevent the output voltage from being affected by the mode switching.
    Type: Grant
    Filed: August 22, 2012
    Date of Patent: April 8, 2014
    Assignees: Ricktek Technology Corp., National Chiao Tung University
    Inventors: Ke-Horng Chen, Wei-Quan Wu, Hsin-Hsin Ho
  • Audio-skipping of a constant on-time power converter
    Patent number: 8664929
    Abstract: When the switching frequency of a constant on-time power converter decreases to a threshold, the power converter is switched from the original operation of triggering a constant on-time of a high-side switch responsive to the output voltage of the power converter reaching a valley point to the operation of triggering a constant off-time of the high-side switch responsive to the output voltage reaching a peak point, to thereby prevent the power converter from operating in an audio frequency range.
    Type: Grant
    Filed: November 30, 2011
    Date of Patent: March 4, 2014
    Assignee: Ricktek Technology Corp.
    Inventors: Po-Chin Fan, Kuo-Ping Liu
  • Driving circuit for a sound outputting apparatus
    Patent number: 8660276
    Abstract: A driving circuit for a sound outputting apparatus includes a H-bridge and a charge pump established by six switches for driving two types of loudspeakers, respectively. The six switches include two common switches to be configured in the H-bridge and the charge pump, thereby reducing the costs and circuit area of the driving circuit.
    Type: Grant
    Filed: December 1, 2011
    Date of Patent: February 25, 2014
    Assignee: Ricktek Technology Corp.
    Inventors: Chang-Chih Lin, Hung-Dar Wang, Pei-Cheng Huang
  • Driving system and method for an electroluminescent display
    Patent number: 7808456
    Abstract: A driving system and method for electroluminescent displays which by connecting the electroluminescent elements that have been lighted up to the electroluminescent elements that are to be lighted up causes charge to be shared among the elements, so as to increase the voltage level at the anodes of the electroluminescent elements which are to be lighted up, thereby reducing the power consumption and increasing the response speed.
    Type: Grant
    Filed: August 28, 2006
    Date of Patent: October 5, 2010
    Assignee: Ricktek Technology Corp.
    Inventors: Chien-Chung Chen, Hsan-Fong Lin, Shei-Chie Yang