Patents by Inventor Ka Hong Loo

Ka Hong Loo 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).

  • Publication number: 20250138078
    Abstract: Disclosed is a power metal-oxide-semiconductor field-effect transistor (MOSFET) diagnostic and lifetime estimation system and method, including the steps of: acquiring degradation data by conducting a degradation test; measuring potential failure precursors to provide early warning of failure; inspecting and diagnosing health condition of internal structure of the power MOSFET device using thermal transient measurement and scanning acoustic microscopy (SAM) images; repeating power cycling test and the measurements of potential failure precursors until the precursors reach a corresponding failure threshold; and estimating remaining lifetime of the power MOSFET device using an artificial intelligence (AI) algorithm.
    Type: Application
    Filed: October 30, 2024
    Publication date: May 1, 2025
    Inventors: Ka Hong LOO, Hiu Hung LEE, Chang LU
  • Publication number: 20240356374
    Abstract: A multifunctional charging circuit includes: a first inverter circuit connected to a primary side winding of an isolation transformer and configured to convert a received first direct current into a first alternating current, then outputting it to the primary side winding; a first wireless charging coil, with one end connected to a corresponding end of a secondary side winding of the isolation transformer, and designed to receive electrical power wirelessly transmitted by a second wireless charging coil; a first resonance compensation circuit connected to the other end of the first wireless charging coil and the corresponding end of the secondary side winding, and configured to generate a resonance based on the electrical power received by the first wireless charging coil and/or the first alternating current received by the secondary side winding, subsequently outputting a first charging current to the rectifier circuit.
    Type: Application
    Filed: April 19, 2024
    Publication date: October 24, 2024
    Inventors: Chi Shing WONG, Ka Hong LOO, Junwei LIU
  • Patent number: 10043493
    Abstract: A drive method and system for an LED display panel. The method comprises: converting an HDMI/DVI video signal into an RGB signal; dividing the RGB signal into N independent code streams and re-ranking same; and periodically switching a direct current provided to an LED display module (30) at least between a first current I1 and a second current I2. The system comprises an FPGA controller (20), and a video signal decoder (10), a first external memory (41), a second external memory (42) and an LED display module (30) which are respectively connected to the FPGA controller (20). The FPGA controller (20) comprises N LED drive modules (231-23N) which are connected in parallel. The drive method and system can enhance the luminous efficacy of an LED, and can also conduct linear dimming on the LED.
    Type: Grant
    Filed: March 27, 2014
    Date of Patent: August 7, 2018
    Assignee: The Hong Kong Polytechnic University
    Inventors: Ka Hong Loo, Yuk Ming Lai, Chi Kong Michael Tse
  • Publication number: 20160118026
    Abstract: A drive method and system for an LED display panel. The method comprises: converting an HDMI/DVI video signal into an RGB signal; dividing the RGB signal into N independent code streams and re-ranking same; and periodically switching a direct current provided to an LED display module (30) at least between a first current I1 and a second current I2. The system comprises an FPGA controller (20), and a video signal decoder (10), a first external memory (41), a second external memory (42) and an LED display module (30) which are respectively connected to the FPGA controller (20). The FPGA controller (20) comprises N LED drive modules (231-23N) which are connected in parallel. The drive method and system can enhance the luminous efficacy of an LED, and can also conduct linear dimming on the LED.
    Type: Application
    Filed: March 27, 2014
    Publication date: April 28, 2016
    Applicant: THE HONG KONG POLYTECHNIC UNIVERSITY
    Inventors: Ka Hong Loo, Yuk Ming Lai, Chi Kong Michael Tse
  • Patent number: 8093821
    Abstract: A driving method for improving luminous efficacy of a light emitting diode (LED), the method comprising: periodically switching a DC current supplied to the LED between a high current level lH and a low current level lL, the low current level lL being fixed at zero or raised above zero to produce a DC offset; and maintaining an average current at a first value If by adjusting the duty cycle acting on the high current level lH and any one from the grouping consisting of: adjusting the high current level lH and adjusting the low current level lL, and adjusting the high current level lH or adjusting the low current level lL.
    Type: Grant
    Filed: February 5, 2009
    Date of Patent: January 10, 2012
    Assignee: The Hong Kong Polytechnic University
    Inventors: Ka Hong Loo, Wai Keung Lun, Yuk Ming Lai, Siew Chong Tan, Chi Kong Michael Tse
  • Publication number: 20100194300
    Abstract: A driving method for improving luminous efficacy of a light emitting diode (LED), the method comprising: periodically switching a DC current supplied to the LED between a high current level lH and a low current level lL, the low current level lL being fixed at zero or raised above zero to produce a DC offset; and maintaining an average current at a first value If by adjusting the duty cycle acting on the high current level lH and any one from the grouping consisting of: adjusting the high current level lH and adjusting the low current level lL, and adjusting the high current level lH or adjusting the low current level lL.
    Type: Application
    Filed: February 5, 2009
    Publication date: August 5, 2010
    Inventors: Ka Hong LOO, Wai Keung LUN, Yuk Ming LAI, Siew Chong TAN, Chi Kong Michael TSE