Patents by Inventor Kuan-Wen Lee

Kuan-Wen Lee 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).

  • Electrolytic capacitor-less AC/DC converter and controlling method thereof
    Patent number: 9300217
    Abstract: An AC/DC converter is disclosed. The proposed AC/DC converter generates an output voltage and includes a current ripple eliminator having an input terminal, an energy storage capacitor and an output terminal, wherein the input terminal has an input voltage, the output terminal generates a pure AC component of a voltage feedback signal based on the output voltage, when the input voltage is larger than a first reference voltage, the energy storage capacitor stores a difference between the input voltage and the first reference voltage as an electric energy, otherwise, the energy storage capacitor releases the electric energy to the input voltage, and an operational amplifier operating the AC component and a second reference voltage to determine when the storage capacitor should store or release the electric energy to minimize a ripple of an output power thereof.
    Type: Grant
    Filed: December 24, 2014
    Date of Patent: March 29, 2016
    Assignee: NATIONAL CHENG KUNG UNIVERSITY
    Inventors: Tsorng-Juu Liang, Kuan-Wen Lee, Yi-Hsun Hsieh, Jiann-Fuh Chen, Yi-Chien Shen
  • ELECTROLYTIC CAPACITOR-LESS AC/DC CONVERTER AND CONTROLLING METHOD THEREOF
    Publication number: 20150180325
    Abstract: An AC/DC converter is disclosed. The proposed AC/DC converter generates an output voltage and includes a current ripple eliminator having an input terminal, an energy storage capacitor and an output terminal, wherein the input terminal has an input voltage, the output terminal generates a pure AC component of a voltage feedback signal based on the output voltage, when the input voltage is larger than a first reference voltage, the energy storage capacitor stores a difference between the input voltage and the first reference voltage as an electric energy, otherwise, the energy storage capacitor releases the electric energy to the input voltage, and an operational amplifier operating the AC component and a second reference voltage to determine when the storage capacitor should store or release the electric energy to minimize a ripple of an output power thereof.
    Type: Application
    Filed: December 24, 2014
    Publication date: June 25, 2015
    Applicant: National Cheng Kung University
    Inventors: Tsorng-Juu Liang, Kuan-Wen Lee, Yi-Hsun Hsieh, Jiann-Fuh Chen, Yi-Chien Shen