Patents by Inventor Choon Keat (Alex) Chew

Choon Keat (Alex) Chew 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: 20140210386
    Abstract: The present disclosure relates to a motor control circuit and related method that includes a transform component configured to receive current values associated with a motor being driven by the motor control circuit, and output polar coordinate values representing a magnitude component and a direction component of a current space vector. The motor control circuit further includes a control component configured to receive the magnitude component and the direction component of the current space vector, and generate motor control signals for driving the motor.
    Type: Application
    Filed: January 30, 2014
    Publication date: July 31, 2014
    Inventors: Tao Zhao, Arno Rabenstein, Theng Kiong Gan, Choon Keat Kok, Sze Main Wong
  • Publication number: 20140210387
    Abstract: A motor control system and associated method includes a transform component configured to receive current values associated with a motor being driven by the motor control system, and output rotating coordinate system values representing a flux generating component and a torque generating component of a current space vector. The motor control system and method further includes a control component configured to receive the flux generating component and the torque generating component of the current space vector, and generate motor control signals for driving the motor by performing a Cartesian to polar transform to obtain values associated with a rotating coordinate system followed by an angle addition to convert the rotating coordinate system values to values of a stationary coordinate system.
    Type: Application
    Filed: January 30, 2014
    Publication date: July 31, 2014
    Inventors: Tao Zhao, Arno Rabenstein, Theng Kiong Gan, Choon Keat Kok, Sze Main Wong
  • Patent number: 8504865
    Abstract: A clock signal may be aligned with a data signal by delaying the signals relative to each other until an edge of one signal aligns with an edge of the other signal, and then causing an inversion of the clock signal. A further variation may limit the relative delay period to one-half clock cycle and may use a double inversion of the clock signal.
    Type: Grant
    Filed: April 20, 2007
    Date of Patent: August 6, 2013
    Assignee: eASIC Corporation
    Inventors: Choon Keat Khor, Yeong Seng Hoo, Soon Chieh Lim
  • Patent number: 8399849
    Abstract: An activation detector for fast-neutrons has a yttrium target exposed to a neutron source. Fast-neutrons which have energy in excess of 1 MeV (above a threshold energy level) generate gamma rays from a nuclear reaction with the yttrium, the gamma rays having an energy level of 908.96 keV, and the resultant gamma rays are coupled to a scintillator which generates an optical response, the optical response of the scintillator is coupled to a photomultiplier tube which generates an electrical response. The number of counts from the photomultiplier tube provides an accurate indication of the fast-neutron flux, and the detector is exclusively sensitive to fast-neutrons with an energy level over 1 MeV, thereby providing a fast-neutron detector which does not require calibration or the setting of a threshold.
    Type: Grant
    Filed: August 8, 2009
    Date of Patent: March 19, 2013
    Assignee: Redpine Signals, Inc
    Inventors: Mahadevan Krishnan, Mahmud Vahdat Roshan, Paul Choon Keat Lee, Rajdeep Singh Rawat, Stuart Victor Springham
  • Patent number: 8040739
    Abstract: A configurable memory system may be able to support at least three different write policies, namely, no-read-on-write, read-before-write, and read-after-write. Such a system may include configurable write signal timing, configurable read signal timing, and/or configurable wordline enable signal timing. Static and/or dynamic configuration of the system may be used.
    Type: Grant
    Filed: February 3, 2009
    Date of Patent: October 18, 2011
    Assignee: eASIC Corporation
    Inventors: Hui Hui Ngu, Choon Keat Khor
  • Publication number: 20100195419
    Abstract: A configurable memory system may be able to support at least three different write policies, namely, no-read-on-write, read-before-write, and read-after-write. Such a system may include configurable write signal timing, configurable read signal timing, and/or configurable wordline enable signal timing. Static and/or dynamic configuration of the system may be used.
    Type: Application
    Filed: February 3, 2009
    Publication date: August 5, 2010
    Applicant: eASIC CORPORATION
    Inventors: Hui Hui Ngu, Choon Keat Khor
  • Publication number: 20080263381
    Abstract: A clock signal may be aligned with a data signal by delaying the signals relative to each other until an edge of one signal aligns with an edge of the other signal, and then causing an inversion of the clock signal. A further variation may limit the relative delay period to one-half clock cycle and may use a double inversion of the clock signal.
    Type: Application
    Filed: April 20, 2007
    Publication date: October 23, 2008
    Applicant: EASIC CORPORATION
    Inventors: Choon Keat Khor, Yeong Seng Hoo, Soon Chieh Lim
  • Patent number: 7012382
    Abstract: An LED-based light system includes a primary light source and at least one redundant light source. The primary light source is activated by itself and the performance of the light source is measured to determine whether nor not to drive the redundant light source. The redundant light source is activated when the performance measurements indicate that a performance characteristic is not being met by the primary light source alone. The first light system can be activated in combination with the redundant light source once the decision is made to activate the redundant light source.
    Type: Grant
    Filed: April 30, 2004
    Date of Patent: March 14, 2006
    Inventors: Tak Meng Cheang, Fook Chuin Ng, Choon Guan Ko, Choon Keat Chew