Patents by Inventor Wei Seng Chew

Wei Seng 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).

  • Patent number: 9379650
    Abstract: Methods and apparatus for determining rotor position in a motor including a rotor and stator windings. The method includes measuring inductive sense values for each pair of the stator windings by performing an inductive sense routine on the motor, measuring stator winding voltage values, induced by mutual inductance between windings, for each of the stator windings by performing a mutual inductance sensing routine on the motor, and determining the rotor position based on the inductive sense values and the stator winding voltage values.
    Type: Grant
    Filed: April 9, 2014
    Date of Patent: June 28, 2016
    Assignee: STMICROELECTRONICS ASIA PACIFIC PTE. LTD.
    Inventors: Wei Seng Chew, Wei Xiong
  • Publication number: 20150295526
    Abstract: Methods and apparatus for determining rotor position in a motor including a rotor and stator windings. The method includes measuring inductive sense values for each pair of the stator windings by performing an inductive sense routine on the motor, measuring stator winding voltage values, induced by mutual inductance between windings, for each of the stator windings by performing a mutual inductance sensing routine on the motor, and determining the rotor position based on the inductive sense values and the stator winding voltage values.
    Type: Application
    Filed: April 9, 2014
    Publication date: October 15, 2015
    Inventors: Wei Seng Chew, Wei Xiong
  • Patent number: 9000703
    Abstract: A first input of a differential circuit is coupled to a coil tap for a first phase of a multi-phase brushless DC motor. The first phase is associated with an electrically floating coil. A second input of the differential circuit is coupled to a virtual center tap. A divider circuit is coupled between coil taps for other phases of the multi-phase brushless DC motor to define a virtual center tap. The other phases are phases actuated for motor operation when the first phase is electrically floating. The coil tap for the first phase is electrically isolated from the virtual center tap. The differential circuit performs a comparison of the voltage at the coil tap for the first phase to the voltage at the virtual center tap to generate a back EMF signal.
    Type: Grant
    Filed: November 28, 2012
    Date of Patent: April 7, 2015
    Assignee: STMicroelectronics Asia Pacific Pte. Ltd.
    Inventors: Wei Seng Chew, Kaufik Linggajaya
  • Publication number: 20140145661
    Abstract: A first input of a differential circuit is coupled to a coil tap for a first phase of a multi-phase brushless DC motor. The first phase is associated with an electrically floating coil. A second input of the differential circuit is coupled to a virtual center tap. A divider circuit is coupled between coil taps for other phases of the multi-phase brushless DC motor to define a virtual center tap. The other phases are phases actuated for motor operation when the first phase is electrically floating. The coil tap for the first phase is electrically isolated from the virtual center tap. The differential circuit performs a comparison of the voltage at the coil tap for the first phase to the voltage at the virtual center tap to generate a back EMF signal.
    Type: Application
    Filed: November 28, 2012
    Publication date: May 29, 2014
    Applicant: STMICROELECTRONICS ASIA PACIFIC PTE. LTD.
    Inventors: Wei Seng Chew, Kaufik Linggajaya
  • Publication number: 20120022821
    Abstract: A system including an integrated circuit configured to transfer a mission mode signal between a mission mode circuit on the integrated circuit and a first input/output pin on the integrated circuit in mission mode and to transfer a development mode signal between a development mode circuit on the integrated circuit and the first input/output pin in debug mode. The integrated circuit is configured to transfer the mission mode signal between the mission mode circuit and a second input/output pin on the integrated circuit in debug mode.
    Type: Application
    Filed: July 23, 2010
    Publication date: January 26, 2012
    Inventors: Paul Dembiczak, Mark John Reed, Wei Seng Chew