Patents by Inventor Hock Tiong Kwa

Hock Tiong Kwa 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).

  • Patent number: 9431386
    Abstract: A control circuit and method are disclosed for controlling a current sense Insulated-Gate Bipolar Transistor (IGBT). In particular, the current sense IGBT creates voltage spikes in a sense voltage as a result of normal switching operations. The control circuit creates a blank period so that the voltage spikes are ignored and false detections of short-circuit events are avoided.
    Type: Grant
    Filed: May 22, 2014
    Date of Patent: August 30, 2016
    Assignee: Avago Technologies General IP (Singapore) Pte. Ltd.
    Inventors: Bin Zhang, Hock Tiong Kwa
  • Publication number: 20150340355
    Abstract: A control circuit and method are disclosed for controlling a current sense Insulated-Gate Bipolar Transistor (IGBT). In particular, the current sense IGBT creates voltage spikes in a sense voltage as a result of normal switching operations. The control circuit creates a blank period so that the voltage spikes are ignored and false detections of short-circuit events are avoided.
    Type: Application
    Filed: May 22, 2014
    Publication date: November 26, 2015
    Applicant: Avago Technologies General IP (Singapore) Pte. Ltd.
    Inventors: Bin Zhang, Hock Tiong Kwa
  • Publication number: 20080118252
    Abstract: An optical coupler having an optical transmitter and an optical receiver are disclosed. The optical transmitter receives a logic signal to be transmitted to a circuit connected to the optical receiver and a photo emitter for generating a light signal having an intensity related to the states of the logic signal. The optical receiver includes a photodetector assembly, a hold circuit, a threshold generating circuit, and a signal generator. The photodetector assembly receives the light signal and generates a photo signal having an amplitude related to that of the light signal. The hold circuit stores a potential related to the maximum amplitude of the photo signal during a preceding time period. The threshold generating circuit generates a high threshold signal related to the stored potential. The signal generator generates an output logic signal that has first and second states that change state when the photo signal crosses the high threshold.
    Type: Application
    Filed: November 20, 2006
    Publication date: May 22, 2008
    Inventors: Fun Kok Chow, Hock Tiong Kwa, Richard K. Klum
  • Patent number: 7265631
    Abstract: The transimpedance amplifier that performs signal amplification includes a first input that receives an input signal, a second input that receives a power signal, a third input that receives a control signal, and an output that generates an output signal. The transimpedance amplifier includes at least one signal amplification circuit that receives the power signal, input signal, and the control signal and that performs both signal amplification on the input signal and regulation of the power signal in response to the control signal.
    Type: Grant
    Filed: March 12, 2005
    Date of Patent: September 4, 2007
    Assignee: Avago Technologies ECBU IP (Singapore) Pte. Ltd.
    Inventors: Hock Tiong Kwa, Richard Kok Keong Lum
  • Patent number: 7265632
    Abstract: In one embodiment, a current source circuit having a reference resistor produces first, second and third bias currents that vary with manufacturing variances of the current compensation resistor. An input amplification stage includes a transconductance stage biased by the first bias current, a first transimpedance amplifier (TIA) biased by the second bias current, and a first feedback resistor coupled between the first TIA's input and output. The input of the first TIA is coupled to an output of the transconductance stage. An output amplification stage is biased by the third bias current and has an input coupled to an output of the first TIA. A second feedback resistor is coupled between the output of the output amplification stage and the input of the transconductance stage. The reference resistor and first and second feedback resistors are formed using a common manufacturing process.
    Type: Grant
    Filed: November 17, 2005
    Date of Patent: September 4, 2007
    Assignee: Avago Technologies ECBU IP (Singapore) Pte. Ltd.
    Inventors: Hock Tiong Kwa, Xue Min Ji, Bin Zhang, Pak Kwong Chan