Patents by Inventor Lance M. Wong

Lance M. Wong 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: 20170373589
    Abstract: A controller includes a switch controller coupled to a power switch coupled to an energy transfer element. The switch controller is coupled to receive a current sense signal representative of a drain current through the power switch. The switch controller is coupled to generate a drive signal to control switching of the power switch in response to the current sense signal and a modulated current limit signal to control a transfer of energy from an input to an output of the power converter. A control modulator is coupled to generate a first signal. A jitter modulator is coupled to generate a second signal. The second signal is a periodic signal having a modulation time period that is greater than a switching period of the drive signal. An arithmetic operator circuit is coupled to generate the modulated current limit signal in response to the first signal and the second signal.
    Type: Application
    Filed: September 7, 2017
    Publication date: December 28, 2017
    Inventors: Roland Sylvere Saint-Pierre, Giao Minh Pham, Lance M. Wong, David Michael Hugh Matthews
  • Patent number: 9837911
    Abstract: A controller for use in a power converter includes a drive circuit coupled to generate a drive signal to control switching of a power switch to control a transfer of energy from a power converter input to a power converter output. An input for receiving an enable signal including enable events is responsive to the power converter output. The drive circuit is coupled to turn ON the power switch in response to the enable events and turn OFF the power switch in response to a power switch current reaching a current limit threshold. A current limit threshold generator is coupled to receive the enable events and vary the current limit threshold in response to the enable events of the enable signal.
    Type: Grant
    Filed: December 7, 2015
    Date of Patent: December 5, 2017
    Assignee: Power Integrations, Inc.
    Inventors: Balu Balakrishnan, Roland Sylvere Saint-Pierre, Giao Minh Pham, Lance M. Wong
  • Patent number: 9774248
    Abstract: A controller for use in a power converter includes a switch controller coupled to a power switch coupled to an energy transfer element. The switch controller is coupled to receive a current sense signal representative of a drain current through the power switch. The switch controller is coupled to generate a drive signal to control switching of the power switch in response to the current sense signal and a modulated current limit signal to control a transfer of energy from an input to an output of the power converter. A current limit generator is coupled to generate a current limit signal. A jitter generator is coupled to generate a jitter signal. An arithmetic operator circuit is coupled to generate the modulated current limit signal in response to the current limit signal and the jitter signal.
    Type: Grant
    Filed: October 13, 2015
    Date of Patent: September 26, 2017
    Assignee: Power Integrations, Inc.
    Inventors: Roland Sylvere Saint-Pierre, Giao Minh Pham, Lance M. Wong, David Michael Hugh Matthews
  • Publication number: 20160134186
    Abstract: A controller for use in a power converter includes a switch controller coupled to a power switch coupled to an energy transfer element. The switch controller is coupled to receive a current sense signal representative of a drain current through the power switch. The switch controller is coupled to generate a drive signal to control switching of the power switch in response to the current sense signal and a modulated current limit signal to control a transfer of energy from an input to an output of the power converter. A current limit generator is coupled to generate a current limit signal. A jitter generator is coupled to generate a jitter signal. An arithmetic operator circuit is coupled to generate the modulated current limit signal in response to the current limit signal and the jitter signal.
    Type: Application
    Filed: October 13, 2015
    Publication date: May 12, 2016
    Inventors: Roland Sylvere Saint-Pierre, Giao Minh Pham, Lance M. Wong, David Michael Hugh Matthews
  • Publication number: 20160087539
    Abstract: A controller for use in a power converter includes a drive circuit coupled to generate a drive signal to control switching of a power switch to control a transfer of energy from a power converter input to a power converter output. An input for receiving an enable signal including enable events is responsive to the power converter output. The drive circuit is coupled to turn ON the power switch in response to the enable events and turn OFF the power switch in response to a power switch current reaching a current limit threshold. A current limit threshold generator is coupled to receive the enable events and vary the current limit threshold in response to the enable events of the enable signal.
    Type: Application
    Filed: December 7, 2015
    Publication date: March 24, 2016
    Inventors: Balu Balakrishnan, Roland Sylvere Saint-Pierre, Giao Minh Pham, Lance M. Wong
  • Patent number: 9246392
    Abstract: A controller for use in a power converter includes a drive circuit coupled to generate a drive signal to control switching of a power switch to control a transfer of energy from a power converter input to a power converter output. The controller also includes an input for receiving an enable signal including enable events responsive to the power converter output. The drive circuit is coupled to turn ON the power switch in response to the enable events and turn OFF the power switch in response to a power switch current reaching a current limit threshold. A current limit threshold generator is coupled to receive the drive signal from the enable events of the enable signal. The current limit threshold may be a ramp signal and the ramp signal along with the time between enable events may be used to modulate the drive signal.
    Type: Grant
    Filed: March 13, 2013
    Date of Patent: January 26, 2016
    Assignee: Power Integrations, Inc.
    Inventors: Balu Balakrishnan, Roland Sylvere Saint-Pierre, Giao Minh Pham, Lance M. Wong
  • Publication number: 20140268922
    Abstract: A controller for use in a power converter includes a drive circuit coupled to generate a drive signal to control switching of a power switch to control a transfer of energy from a power converter input to a power converter output. The controller also includes an input for receiving an enable signal including enable events responsive to the power converter output. The drive circuit is coupled to turn ON the power switch in response to the enable events and turn OFF the power switch in response to a power switch current reaching a current limit threshold. A current limit threshold generator is coupled to receive the drive signal from the enable events of the enable signal. The current limit threshold may be a ramp signal and the ramp signal along with the time between enable events may be used to modulate the drive signal.
    Type: Application
    Filed: March 13, 2013
    Publication date: September 18, 2014
    Applicant: POWER INTEGRATIONS, INC.
    Inventors: Balu Balakrishnan, Roland Sylvere Saint-Pierre, Giao Minh Pham, Lance M. Wong
  • Publication number: 20100128899
    Abstract: A circuit for generating a large RC time-constant includes an input node for receiving an input signal making a transition from a first state to a second state characterized by a first time-constant, and an output node for providing an output signal making a transiting from the first state to the second state in response to the input signal. The circuit also includes a first MOS field effect transistor coupled between the input node and the output node. The circuit further includes a first capacitor coupled between the output node and a ground node. A switch circuit is connected to a gate of the first MOS field effect transistor. The switch circuit is configured to bias the MOS field effect transistor to operate in saturation mode and the transition of the output signal is characterized by a time-constant associated with this large output resistance and the capacitor coupled to the output node.
    Type: Application
    Filed: November 26, 2008
    Publication date: May 27, 2010
    Applicant: NUVOTON TECHNOLOGY CORPORATION
    Inventor: LANCE M. WONG
  • Publication number: 20100128898
    Abstract: A circuit, system and method provide the suppression of pop at power up of audio amplifiers. The output driver is tri-stated at power up and is enabled after a predetermined time constant. In one embodiment, the output driver includes a MOS transistor pair connected in a push-pull configuration and switches that are under the control of a delay circuit. the. The output driver and the delay circuit may be part of a power amplifier in an audio system. The delay circuit may be implemented using mixed analog and digital signals or a digital controller configured to receive a clock frequency and execute a machine readable program code. The delay circuit is responsive for the start-up behavior of the audio system.
    Type: Application
    Filed: November 26, 2008
    Publication date: May 27, 2010
    Applicant: NUVOTON TECHNOLOGY CORPORATION
    Inventor: LANCE M. WONG
  • Publication number: 20100117687
    Abstract: A track and hold circuit includes an operational amplifier having first and second input ends and first and second output ends. A first capacitor has a first end and a second end operably coupled with the first input end and the first output end of the operational amplifier, respectively, wherein the second end of the first capacitor is switchably coupled with a first input voltage (Vinp). A second capacitor has a first end and a second end operably coupled with the second input end and the second output end of the operational amplifier, respectively, wherein the second end of the second capacitor is switchably coupled with a second input voltage (Vinn). A medium voltage (VMID) providing means selectively provides a voltage substantially equal to (Vinp+Vinn)/2, wherein the first ends of the first capacitor and second capacitor are operably coupled with the VMID providing means.
    Type: Application
    Filed: November 7, 2008
    Publication date: May 13, 2010
    Applicant: NUVOTON TECHNOLOGY CORPORATION
    Inventor: LANCE M. WONG
  • Patent number: 6954115
    Abstract: A method for tuning a filter to a desired frequency using successive approximation. Elements of the filter are selected according to a control code used to vary the filter's oscillation frequency. The control code is set to the middle of the control code range and resulting oscillation frequency is compared to the desired frequency. If the control code needs to be increased, the control code is set to ¾ of the control code range. If the control code needs to be decreased, the control code is set to ¼ of the control code range. The method continues using successive approximation to determine the value of each bit of the control code. Thus, successive approximation is used to converge on the value of the control code that produces an oscillation frequency of the filter that is closest to the desired frequency (with a maximum error of 1 least significant bit).
    Type: Grant
    Filed: May 29, 2003
    Date of Patent: October 11, 2005
    Assignee: RF Stream Corporation
    Inventor: Lance M. Wong
  • Publication number: 20030222729
    Abstract: A method for tuning a filter to a desired frequency using successive approximation. Elements of the filter are selected according to a control code used to vary the filter's oscillation frequency. The control code is set to the middle of the control code range and resulting oscillation frequency is compared to the desired frequency. If the control code needs to be increased, the control code is set to ¾ of the control code range. If the control code needs to be decreased, the control code is set to ¼ of the control code range. The method continues using successive approximation to determine the value of each bit of the control code. Thus, successive approximation is used to converge on the value of the control code that produces an oscillation frequency of the filter that is closest to the desired frequency (with a maximum error of 1 least significant bit).
    Type: Application
    Filed: May 29, 2003
    Publication date: December 4, 2003
    Inventor: Lance M. Wong