Patents by Inventor Keqiu Zeng

Keqiu Zeng 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).

  • Radio frequency power amplifier and method of assembly thereof
    Patent number: 11784614
    Abstract: Radio frequency amplifier (200) assembly with effective prevention of RF interference.
    Type: Grant
    Filed: November 8, 2019
    Date of Patent: October 10, 2023
    Assignee: Koninklijke Philips N.V.
    Inventors: Keqiu Zeng, Cong Zhou, Yuanxu Ding, Jungyang Zhang, Jun Ma
  • RADIO FREQUENCY POWER AMPLIFIER AND METHOD OF ASSEMBLY THEREOF
    Publication number: 20210376803
    Abstract: Radio frequency amplifier (200) assembly with effective prevention of RF interference.
    Type: Application
    Filed: November 8, 2019
    Publication date: December 2, 2021
    Inventors: KEQIU ZENG, CONG ZHOU, YUANXU DING, JUNGYANG ZHANG, JUN MA
  • Gradient amplifier system for driving a gradient coil and configuration method
    Patent number: 10371771
    Abstract: A gradient amplifier system includes a gradient amplifier for driving a gradient current through the gradient coil. The gradient amplifier includes a gradient filter; a controller coupled to the gradient amplifier for controlling the gradient current in the gradient coil; a feedback loop for feeding only the gradient current in the gradient coil back to the controller. The controller is configured based on only the fedback gradient current in the gradient coil. Filter parameters of the gradient filter are adjusted to achieve a minimum shift between predetermined poles representing a desired performance of the gradient amplifier system and actual poles of a rational transfer function associated with the controller.
    Type: Grant
    Filed: July 30, 2015
    Date of Patent: August 6, 2019
    Assignee: KONINKLIJKE PHILIPS N.V.
    Inventors: Ying Zhang, Gong Chen, Keqiu Zeng
  • Apparatus and method for amplifying a radio-frequency signal
    Patent number: 9885765
    Abstract: The present invention provides an apparatus and a method for amplifying a radio-frequency signal and an MRI system comprising the apparatus.
    Type: Grant
    Filed: February 20, 2013
    Date of Patent: February 6, 2018
    Assignee: KONINKLIJKE PHILIPS N.V.
    Inventors: Keqiu Zeng, Yong Liu, Tao Wang
  • GRADIENT AMPLIFER SYSTEM FOR DRIVING A GRADIENT COIL AND CONFIGURATION METHOD
    Publication number: 20170212194
    Abstract: This invention relates to a gradient amplifier system for driving a gradient coil and a configuration method thereof. The gradient amplifier system comprises a gradient amplifier for driving a gradient current through the gradient coil, wherein the gradient amplifier further comprises a gradient filter; a controller coupled to the gradient amplifier for controlling the gradient current in the gradient coil; a feedback loop for feeding only the gradient current in the gradient coil back to the controller, wherein the controller is configured based on only the fedback gradient current in the gradient coil, and wherein filter parameters of the gradient filter are adjusted to achieve a minimum shift between predetermined poles representing a desired performance of the gradient amplifier system (21) and actual poles of a rational transfer function associated with the controller.
    Type: Application
    Filed: July 30, 2015
    Publication date: July 27, 2017
    Inventors: YING ZHANG, GONG CHEN, KEQIU ZENG
  • METHOD AND APPARATUS FOR CALCULATING THE JUNCTION TEMPERATURE OF AN RF POWER MOSFET
    Publication number: 20170030778
    Abstract: There are provided a method and apparatus for calculating the junction temperature of an RF power MOSFET. The method for calculating the junction temperature of an RF power MOSFET, comprising steps of: establishing a transient thermal impedance model of the RF power MOSFET in analog domain; calculating a transfer function in time domain of the transient thermal impedance model using bilinear transformation; establishing a junction temperature compensation model in digital domain based on the transfer function in time domain of the transient thermal impedance model with a sampling frequency and a type of 2nd order IIR filter structure; and calculating the junction temperature of the RF power MOSFET by inputting an actual input to the junction temperature compensation model. The present invention improves accuracy in determining the junction temperature of an RF power MOSFET.
    Type: Application
    Filed: March 3, 2015
    Publication date: February 2, 2017
    Inventors: KEQIU ZENG, TAO WANG, KAILAS SENAN
  • APPARATUS AND METHOD FOR AMPLIFYING A RADIO-FREQUENCY SIGNAL
    Publication number: 20150042340
    Abstract: The present invention provides an apparatus and a method for amplifying a radio-frequency signal and an MRI system comprising the apparatus.
    Type: Application
    Filed: February 20, 2013
    Publication date: February 12, 2015
    Inventors: Keqiu Zeng, Yong Liu, Tao Wang