Patents by Inventor Siqiang Fan

Siqiang Fan 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: 20190332909
    Abstract: According to another embodiment, a system includes a driver circuit that drives a first output and a second output; a coil coupled between the first output and the second output such that the driver circuit drives current through the coil in response to control signals; and a programmable slew circuit coupled to the driver circuit. In some embodiments, a switch is coupled between the first output and the coil. In some embodiments an over-voltage protection circuit is coupled to protect the driver circuit.
    Type: Application
    Filed: July 12, 2019
    Publication date: October 31, 2019
    Inventors: Rui LIU, Tao QI, Lijie ZHAO, Gustavo James MEHAS, Tae Kwang PARK, Zhitong GUO, Siqiang FAN
  • Publication number: 20190325280
    Abstract: According to another embodiment, a system includes a driver circuit that drives a first output and a second output; a coil coupled between the first output and the second output such that the driver circuit drives current through the coil in response to control signals; and a programmable slew circuit coupled to the driver circuit. In some embodiments, a switch is coupled between the first output and the coil. In some embodiments an over-voltage protection circuit is coupled to protect the driver circuit.
    Type: Application
    Filed: March 27, 2019
    Publication date: October 24, 2019
    Inventors: Rui LIU, Tao QI, Lijie ZHAO, Gustavo James MEHAS, Tae Kwang PARK, Zhitong GUO, Siqiang FAN
  • Patent number: 10360485
    Abstract: According to another embodiment, a system includes a driver circuit that drives a first output and a second output; a coil coupled between the first output and the second output such that the driver circuit drives current through the coil in response to control signals; and a programmable slew circuit coupled to the driver circuit. In some embodiments, a switch is coupled between the first output and the coil. In some embodiments an over-voltage protection circuit is coupled to protect the driver circuit.
    Type: Grant
    Filed: August 28, 2017
    Date of Patent: July 23, 2019
    Assignee: Integrated Device Technology, Inc.
    Inventors: Rui Liu, Tao Qi, Lijie Zhao, Gustavo James Mehas, Tae Kwang Park, Zhitong Guo, Siqiang Fan
  • Publication number: 20180287497
    Abstract: A power converter control circuit includes a first ramp generator connected to an input voltage and configured to produce a first ramp signal; a second ramp generator connected to the input voltage and configured to produce a second ramp signal; an error amplifier configured to produce an error amplifier output. The first ramp signal and the error amplifier output are used to produce a first (pulse width modulation) PWM signal and the second ramp signal and the error amplifier output are used to produce a second PWM signal. The first and second PWM signals control an operating state of the circuit. In some embodiments, the first ramp signal includes an extended ramp reset time. In some embodiments, the first ramp generator includes a switching device, a current source, and a capacitor.
    Type: Application
    Filed: April 3, 2018
    Publication date: October 4, 2018
    Inventors: Gustavo MEHAS, Rui LIU, Lijie ZHAO, Siqiang FAN, Tae Kwang PARK, Zhitong GUO
  • Publication number: 20180060712
    Abstract: According to another embodiment, a system includes a driver circuit that drives a first output and a second output; a coil coupled between the first output and the second output such that the driver circuit drives current through the coil in response to control signals; and a programmable slew circuit coupled to the driver circuit. In some embodiments, a switch is coupled between the first output and the coil. In some embodiments an over-voltage protection circuit is coupled to protect the driver circuit.
    Type: Application
    Filed: August 28, 2017
    Publication date: March 1, 2018
    Inventors: Rui LIU, Tao QI, Lijie ZHAO, Gustavo James MEHAS, Tae Kwang PARK, Zhitong GUO, Siqiang FAN
  • Patent number: 9590501
    Abstract: The present disclosure is directed to a fast load transient response power supply system using dynamic reference voltage generation. A system may comprise, for example, at least power supply circuitry, voltage reference circuitry and dynamic reference generation circuitry. The power supply circuitry may be configured to generate an output voltage (e.g., for driving a load) based on a power supply input voltage. The voltage reference circuitry may be configured to generate a reference voltage for use in controlling the generation of the output voltage. The dynamic reference generation circuitry may be configured to generate a dynamic reference voltage as the input voltage for the power supply circuitry based on the reference voltage and the output voltage.
    Type: Grant
    Filed: April 25, 2013
    Date of Patent: March 7, 2017
    Assignee: Fairchild Semiconductor Corporation
    Inventors: Bin Zhao, Siqiang Fan
  • Publication number: 20140320327
    Abstract: A system for scalable voltage ramp control for power supply systems. A system may comprise at least power supply circuitry, digital-to-analog (D/A) converter circuitry and a controller. The power supply circuitry may be configured to output a voltage to a load based on an input voltage provided by the D/A converter. The controller may be configured to control the D/A converter (e.g., to cause the D/A converter to provide the input voltage to the power supply circuitry) using a large range voltage ramp-up or a small range voltage ramp-up. Utilization of the large range voltage ramp-up or the small range voltage ramp-up by the controller may be based on, for example, a threshold voltage.
    Type: Application
    Filed: April 25, 2013
    Publication date: October 30, 2014
    Applicant: FAIRCHILD SEMICONDUCTOR CORPORATION
    Inventors: Siqiang Fan, Andrew Kameya, Bin Zhao
  • Publication number: 20140320093
    Abstract: The present disclosure is directed to a fast load transient response power supply system using dynamic reference voltage generation. A system may comprise, for example, at least power supply circuitry, voltage reference circuitry and dynamic reference generation circuitry. The power supply circuitry may be configured to generate an output voltage (e.g., for driving a load) based on a power supply input voltage. The voltage reference circuitry may be configured to generate a reference voltage for use in controlling the generation of the output voltage. The dynamic reference generation circuitry may be configured to generate a dynamic reference voltage as the input voltage for the power supply circuitry based on the reference voltage and the output voltage.
    Type: Application
    Filed: April 25, 2013
    Publication date: October 30, 2014
    Applicant: FAIRCHILD SEMICONDUCTOR CORPORATION
    Inventors: Bin Zhao, Siqiang Fan
  • Patent number: 8860595
    Abstract: A system for scalable voltage ramp control for power supply systems. A system may comprise at least power supply circuitry, digital-to-analog (D/A) converter circuitry and a controller. The power supply circuitry may be configured to output a voltage to a load based on an input voltage provided by the D/A converter. The controller may be configured to control the D/A converter (e.g., to cause the D/A converter to provide the input voltage to the power supply circuitry) using a large range voltage ramp-up or a small range voltage ramp-up. Utilization of the large range voltage ramp-up or the small range voltage ramp-up by the controller may be based on, for example, a threshold voltage.
    Type: Grant
    Filed: April 25, 2013
    Date of Patent: October 14, 2014
    Assignee: Fairchild Semiconductor Corporation
    Inventors: Siqiang Fan, Andrew Kameya, Bin Zhao