Patents by Inventor Run Qin Tan

Run Qin Tan 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).

  • Transition mode power factor correction device with built-in automatic total harmonic distortion reduction feature
    Patent number: 8129958
    Abstract: A controller for reducing the harmonics contents in the AC-to-DC converter that is capable of minimizing THD due to crossover distortion. The controller can approximate the shape of the current running through boost inductor to the sinusoidal waveform of the rectified line input voltage and in the meantime to keep the valley of rectified sinusoidal waveform line voltage close to local ground value. The controller can be used in a transition mode power factor correction device suitable for a wide range of AC line input voltage and output loading application.
    Type: Grant
    Filed: March 25, 2009
    Date of Patent: March 6, 2012
    Assignee: Evergreen Micro Devices Co., Ltd.
    Inventors: Matthew Man Ho Ku, Run Qin Tan
  • Clamp protection circuit and a PFC control circuit employing such clamp protection circuit
    Patent number: 8045308
    Abstract: The present invention relates to clamp protection circuit and a PFC control circuit employing such clamp protection circuit. Said clamp protection circuit comprises a high voltage isolation module used for receiving power from a high voltage power supply; a voltage clamp module used for receiving an output low voltage from the high voltage isolation module and realizing a clamp protection; and a low voltage bias module used for providing bias voltage to the high voltage isolation module and the voltage clamp module. By employing the clamp protection circuit, the precision of the clamp voltage is improved, the design is simplified and the silicon area is reduced. Meanwhile, the transient response is enhanced.
    Type: Grant
    Filed: April 2, 2009
    Date of Patent: October 25, 2011
    Assignee: Evergreen Micro Devices Co., Ltd.
    Inventors: Run Qin Tan, Li Fang Guo, Matthew Man Ho Ku
  • CLAMP PROTECTION CIRCUIT AND A PFC CONTROL CIRCUIT EMPLOYING SUCH CLAMP PROTECTION CIRCUIT
    Publication number: 20100253410
    Abstract: The present invention relates to clamp protection circuit and a PFC control circuit employing such clamp protection circuit. Said clamp protection circuit comprises a high voltage isolation module used for receiving power from a high voltage power supply; a voltage clamp module used for receiving an output low voltage from the high voltage isolation module and realizing a clamp protection; and a low voltage bias module used for providing bias voltage to the high voltage isolation module and the voltage clamp module. By employing the clamp protection circuit, the precision of the clamp voltage is improved, the design is simplified and the silicon area is reduced. Meanwhile, the transient response is enhanced.
    Type: Application
    Filed: April 2, 2009
    Publication date: October 7, 2010
    Applicant: EVERGREEN MICRO DEVICES CO., LTD.
    Inventors: Run Qin Tan, Li Fang Guo, Matthew Man Ho Ku
  • TRANSITION MODE POWER FACTOR CORRECTION DEVICE WITH BUILT-IN AUTOMATIC TOTAL HARMONIC DISTORTION REDUCTION FEATURE
    Publication number: 20100246226
    Abstract: The present invention relates to controller for reducing the harmonics contents in the AC-to-DC converter.
    Type: Application
    Filed: March 25, 2009
    Publication date: September 30, 2010
    Applicant: EVERGREEN MICRO DEVICES CO., LTD.
    Inventors: Matthew Man Ho Ku, Run Qin Tan