Patents by Inventor King Pok Lee

King Pok 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).

  • Impedance matching circuit for switched alternating current power supplies
    Patent number: 6486770
    Abstract: A traffic light system (10) with an impedance matching circuit (14) for electrically coupling an optical assembly (12) to a switched AC power supply (26) is described. The impedance matching circuit (14) has a matching transformer (20), a first resistor chain (22) and a second resistor chain (24). Each resistor chain (22,24) has an input and an output. Each of the inputs is common with a respective electrical node of the matching transformer (20). Each of the outputs is common with a respective supply node provided by the primary windings (18a) of an input transformer (18) of the optical assembly (12).
    Type: Grant
    Filed: April 19, 2001
    Date of Patent: November 26, 2002
    Assignee: Singapore Technologies Electronics, Ltd.
    Inventors: Koh Hock Tan, Kay Keow Quincey Poon, King Pok Lee, Kheng Joo Yeo, See Tee Tan
  • IMPEDANCE MATCHING CIRCUIT FOR SWITCHED ALTERNATING CURRENT POWER SUPPLIES
    Publication number: 20020154001
    Abstract: A traffic light system (10) with an impedance matching circuit (14) for electrically coupling an optical assembly (12) to a switched AC power supply (26) is described. The impedance matching circuit (14) has a matching transformer (20), a first resistor chain (22) and a second resistor chain (24). Each resistor chain (22, 24) has an input and an output. Each of the inputs is common with a respective electrical node of the matching transformer (20). Each of the outputs is common with a respective supply node provided by the primary windings (18a) of an input transformer (18) of the optical assembly (12).
    Type: Application
    Filed: April 19, 2001
    Publication date: October 24, 2002
    Inventors: Koh Hock Tan, Kay Keow Quincey Poon, King Pok Lee, Kheng Joo Yeo, See Tee Tan