Patents by Inventor Xiangkun Zhai

Xiangkun Zhai 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: 20210226596
    Abstract: System and method for error amplification and processing. For example, the system includes: a signal processing unit configured to receive a reference signal and a feedback signal and generate a digital pulse signal, a frequency of the digital pulse signal being associated with a difference between the reference signal and the feedback signal; a counter configured to receive the digital pulse signal and generate a counter output signal based on at least information associated with the digital pulse signal; and a digital-to-analog converter configured to receive the counter output signal and generate an output signal based on at least information associated with the counter output signal.
    Type: Application
    Filed: January 13, 2021
    Publication date: July 22, 2021
    Inventors: YAOZHANG CHEN, Xiangkun ZHAI, Liqiang ZHU, Lieyi FANG
  • Publication number: 20210067027
    Abstract: Controller and method for a power converter. For example, a controller for a power converter includes: a first terminal configured to receive a first terminal voltage; a second terminal configured to receive a second terminal voltage; a comparator configured to receive a first threshold voltage and the second terminal voltage and to generate a comparison signal based at least in part on the first threshold voltage and the second terminal voltage; and a switch configured to receive the first terminal voltage and the comparison signal, the switch being further configured to be closed to allow a current to flow out of the second terminal through the switch if the comparison signal is at a first logic level; wherein the comparator is further configured to: receive a first reference voltage as the first threshold voltage if the first terminal voltage is smaller than a second threshold voltage.
    Type: Application
    Filed: October 7, 2019
    Publication date: March 4, 2021
    Inventors: Tuofu Liu, Xiangkun Zhai, Lieyi Fang
  • Patent number: 10694599
    Abstract: Systems and methods are provided for regulating one or more currents. An example system controller includes: a thermal detector configured to detect a temperature associated with the system controller and generate a thermal detection signal based at least in part on the detected temperature; and a modulation-and-driver component configured to receive the thermal detection signal and generate a drive signal based at least in part on the thermal detection signal to close or open a switch to affect a drive current associated with one or more light emitting diodes. The modulation-and-driver component is further configured to, in response to the detected temperature increasing from a first temperature threshold but remaining smaller than a second temperature threshold, generate the drive signal to keep the drive current at a first current magnitude, the second temperature threshold being higher than the first temperature threshold.
    Type: Grant
    Filed: February 25, 2019
    Date of Patent: June 23, 2020
    Assignee: On-Bright Electronics (Shanghai) Co., Ltd.
    Inventors: Xiangkun Zhai, Liqiang Zhu, Qiang Luo
  • Patent number: 10686359
    Abstract: Systems and methods are provided for regulating a power conversion system. An example system controller includes a first controller terminal and a second controller terminal. The first controller terminal is configured to receive a first signal associated with an input signal for a primary winding of a power conversation system. The second controller terminal is configured to output a drive signal to a switch to affect a first current flowing through the primary winding of the power conversion system, the drive signal being associated with an on-time period, the switch being closed during the on-time period. The system controller is configured to adjust a duration of the on-time period based on at least information associated with the first signal.
    Type: Grant
    Filed: June 21, 2018
    Date of Patent: June 16, 2020
    Assignee: On-Bright Electronics (Shanghai) Co., Ltd.
    Inventors: Xiangkun Zhai, Yunchao Zhang, Jun Zhou, Lieyi Fang
  • Patent number: 10680525
    Abstract: Systems and methods are provided for regulating power conversion systems. A system controller includes: a first controller terminal configured to receive a first signal related to an input signal for a primary winding of a power conversation system; and a second controller terminal configured to output a drive signal to a switch to affect a current flowing through the primary winding, the drive signal being associated with a switching period including an on-time period and an off-time period. The switch is closed (e.g., being turned on) in response to the drive signal during the on-time period. The switch is opened (e.g., being turned off) in response to the drive signal during the off-time period. A duty cycle is equal to a duration of the on-time period divided by a duration of the switching period. The system controller is configured to keep a multiplication product of the duty cycle and the duration of the on-time period approximately constant.
    Type: Grant
    Filed: February 28, 2019
    Date of Patent: June 9, 2020
    Assignee: On-Bright Electronics (Shanghai) Co., Ltd.
    Inventors: Qian Fang, Xiangkun Zhai, Lieyi Fang
  • Patent number: 10536081
    Abstract: System and method for driving a bipolar junction transistor for a power converter. The system includes a current generator configured to output a drive current signal to a bipolar junction transistor to adjust a primary current flowing through a primary winding of a power converter. The current generator is further configured to output the drive current signal to turn on the bipolar junction transistor during a first time period, a second time period, and a third time period, the second time period separating the first time period from the third time period, drive the bipolar junction transistor to operate in a hard-saturation region during the first time period and the second time period, and drive the bipolar junction transistor to operate in a quasi-saturation region during the third time period.
    Type: Grant
    Filed: October 31, 2017
    Date of Patent: January 14, 2020
    Assignee: On-Bright Electronics (Shanghai) Co., Ltd.
    Inventors: Xiangkun Zhai, Yuan Lin, Xiaomin Huang, Lieyi Fang
  • Publication number: 20190348919
    Abstract: Systems and methods are provided for regulating power conversion systems. A system controller includes: a first controller terminal configured to receive a first signal related to an input signal for a primary winding of a power conversation system; and a second controller terminal configured to output a drive signal to a switch to affect a current flowing through the primary winding, the drive signal being associated with a switching period including an on-time period and an off-time period. The switch is closed (e.g., being turned on) in response to the drive signal during the on-time period. The switch is opened (e.g., being turned off) in response to the drive signal during the off-time period. A duty cycle is equal to a duration of the on-time period divided by a duration of the switching period. The system controller is configured to keep a multiplication product of the duty cycle and the duration of the on-time period approximately constant.
    Type: Application
    Filed: February 28, 2019
    Publication date: November 14, 2019
    Inventors: QIAN FANG, Xiangkun Zhai, Lieyi Fang
  • Publication number: 20190327812
    Abstract: Systems and methods are provided for regulating one or more currents. An example system controller includes: a thermal detector configured to detect a temperature associated with the system controller and generate a thermal detection signal based at least in part on the detected temperature; and a modulation-and-driver component configured to receive the thermal detection signal and generate a drive signal based at least in part on the thermal detection signal to close or open a switch to affect a drive current associated with one or more light emitting diodes. The modulation-and-driver component is further configured to, in response to the detected temperature increasing from a first temperature threshold but remaining smaller than a second temperature threshold, generate the drive signal to keep the drive current at a first current magnitude, the second temperature threshold being higher than the first temperature threshold.
    Type: Application
    Filed: February 25, 2019
    Publication date: October 24, 2019
    Inventors: XIANGKUN ZHAI, LIQIANG ZHU, QIANG LUO
  • Patent number: 10432096
    Abstract: Systems and methods are provided for regulating power conversion systems. A system controller includes: a first controller terminal configured to receive a first signal related to an input signal for a primary winding of a power conversation system; and a second controller terminal configured to output a drive signal to a switch to affect a current flowing through the primary winding, the drive signal being associated with a switching period including an on-time period and an off-time period. The switch is closed (e.g., being turned on) in response to the drive signal during the on-time period. The switch is opened (e.g., being turned off) in response to the drive signal during the off-time period. A duty cycle is equal to a duration of the on-time period divided by a duration of the switching period. The system controller is configured to keep a multiplication product of the duty cycle and the duration of the on-time period approximately constant.
    Type: Grant
    Filed: November 6, 2017
    Date of Patent: October 1, 2019
    Assignee: On-Bright Electronics (Shanghai) Co., Ltd.
    Inventors: Qian Fang, Xiangkun Zhai, Lleyi Fang
  • Patent number: 10264644
    Abstract: Systems and methods are provided for regulating one or more currents. An example system controller includes: a thermal detector configured to detect a temperature associated with the system controller and generate a thermal detection signal based at least in part on the detected temperature; and a modulation-and-driver component configured to receive the thermal detection signal and generate a drive signal based at least in part on the thermal detection signal to close or open a switch to affect a drive current associated with one or more light emitting diodes. The modulation-and-driver component is further configured to, in response to the detected temperature increasing from a first temperature threshold but remaining smaller than a second temperature threshold, generate the drive signal to keep the drive current at a first current magnitude, the second temperature threshold being higher than the first temperature threshold.
    Type: Grant
    Filed: April 2, 2018
    Date of Patent: April 16, 2019
    Assignee: On-Bright Electronics (Shanghai) Co., Ltd.
    Inventors: Xiangkun Zhai, Liqiang Zhu, Qiang Luo
  • Publication number: 20180351447
    Abstract: Systems and methods are provided for regulating a power conversion system. An example system controller includes a first controller terminal and a second controller terminal. The first controller terminal is configured to receive a first signal associated with an input signal for a primary winding of a power conversation system. The second controller terminal is configured to output a drive signal to a switch to affect a first current flowing through the primary winding of the power conversion system, the drive signal being associated with an on-time period, the switch being closed during the on-time period. The system controller is configured to adjust a duration of the on-time period based on at least information associated with the first signal.
    Type: Application
    Filed: June 21, 2018
    Publication date: December 6, 2018
    Inventors: XIANGKUN ZHAI, YUNCHAO ZHANG, JUN ZHOU, LIEYI FANG
  • Publication number: 20180295693
    Abstract: Systems and methods are provided for regulating one or more currents. An example system controller includes: a thermal detector configured to detect a temperature associated with the system controller and generate a thermal detection signal based at least in part on the detected temperature; and a modulation-and-driver component configured to receive the thermal detection signal and generate a drive signal based at least in part on the thermal detection signal to close or open a switch to affect a drive current associated with one or more light emitting diodes. The modulation-and-driver component is further configured to, in response to the detected temperature increasing from a first temperature threshold but remaining smaller than a second temperature threshold, generate the drive signal to keep the drive current at a first current magnitude, the second temperature threshold being higher than the first temperature threshold.
    Type: Application
    Filed: April 2, 2018
    Publication date: October 11, 2018
    Inventors: Xiangkun Zhai, Liqiang Zhu, Qiang Luo
  • Patent number: 10044254
    Abstract: Systems and methods are provided for regulating a power conversion system. An example system controller includes a first controller terminal and a second controller terminal. The first controller terminal is configured to receive a first signal associated with an input signal for a primary winding of a power conversation system. The second controller terminal is configured to output a drive signal to a switch to affect a first current flowing through the primary winding of the power conversion system, the drive signal being associated with an on-time period, the switch being closed during the on-time period. The system controller is configured to adjust a duration of the on-time period based on at least information associated with the first signal.
    Type: Grant
    Filed: December 6, 2016
    Date of Patent: August 7, 2018
    Assignee: On-Bright Electronics (Shanghai) Co., Ltd.
    Inventors: Xiangkun Zhai, Yunchao Zhang, Jun Zhou, Lieyi Fang
  • Patent number: 10003268
    Abstract: Systems and methods are provided for regulating power conversion systems. A system controller includes: a first controller terminal configured to receive a first signal related to an input signal for a primary winding of a power conversation system; and a second controller terminal configured to output a drive signal to a switch to affect a current flowing through the primary winding, the drive signal being associated with a switching period including an on-time period and an off-time period. The switch is closed (e.g., being turned on) in response to the drive signal during the on-time period. The switch is opened (e.g., being turned off) in response to the drive signal during the off-time period. A duty cycle is equal to a duration of the on-time period divided by a duration of the switching period. The system controller is configured to keep a multiplication product of the duty cycle and the duration of the on-time period approximately constant.
    Type: Grant
    Filed: June 29, 2015
    Date of Patent: June 19, 2018
    Assignee: On-Bright Electronics (Shanghai) Co., Ltd.
    Inventors: Qian Fang, Xiangkun Zhai, Lieyi Fang
  • Patent number: 9991802
    Abstract: Systems and methods are provided for regulating a power conversion system. An example system controller includes a first controller terminal and a second controller terminal. The first controller terminal is configured to receive a first signal associated with an input signal for a primary winding of a power conversation system. The second controller terminal is configured to output a drive signal to a switch to affect a first current flowing through the primary winding of the power conversion system, the drive signal being associated with an on-time period, the switch being closed during the on-time period. The system controller is configured to adjust a duration of the on-time period based on at least information associated with the first signal.
    Type: Grant
    Filed: November 28, 2016
    Date of Patent: June 5, 2018
    Assignee: On-Bright Electronics (Shanghai) Co., Ltd.
    Inventors: Xiangkun Zhai, Yunchao Zhang, Jun Zhou, Lieyi Fang
  • Patent number: 9967941
    Abstract: Systems and methods are provided for regulating one or more currents. An example system controller includes: a thermal detector configured to detect a temperature associated with the system controller and generate a thermal detection signal based at least in part on the detected temperature; and a modulation-and-driver component configured to receive the thermal detection signal and generate a drive signal based at least in part on the thermal detection signal to close or open a switch to affect a drive current associated with one or more light emitting diodes. The modulation-and-driver component is further configured to, in response to the detected temperature increasing from a first temperature threshold but remaining smaller than a second temperature threshold, generate the drive signal to keep the drive current at a first current magnitude, the second temperature threshold being higher than the first temperature threshold.
    Type: Grant
    Filed: June 18, 2015
    Date of Patent: May 8, 2018
    Assignee: ON-BRIGHT ELECTRONICS (SHANGHAI) CO., LTD.
    Inventors: Xiangkun Zhai, Liqiang Zhu, Qiang Luo
  • Publication number: 20180123464
    Abstract: Systems and methods are provided for regulating power conversion systems. A system controller includes: a first controller terminal configured to receive a first signal related to an input signal for a primary winding of a power conversation system; and a second controller terminal configured to output a drive signal to a switch to affect a current flowing through the primary winding, the drive signal being associated with a switching period including an on-time period and an off-time period. The switch is closed (e.g., being turned on) in response to the drive signal during the on-time period. The switch is opened (e.g., being turned off) in response to the drive signal during the off-time period. A duty cycle is equal to a duration of the on-time period divided by a duration of the switching period. The system controller is configured to keep a multiplication product of the duty cycle and the duration of the on-time period approximately constant.
    Type: Application
    Filed: November 6, 2017
    Publication date: May 3, 2018
    Inventors: QIAN FANG, XIANGKUN ZHAI, LIEYI FANG
  • Publication number: 20180115248
    Abstract: System and method for driving a bipolar junction transistor for a power converter. The system includes a current generator configured to output a drive current signal to a bipolar junction transistor to adjust a primary current flowing through a primary winding of a power converter. The current generator is further configured to output the drive current signal to turn on the bipolar junction transistor during a first time period, a second time period, and a third time period, the second time period separating the first time period from the third time period, drive the bipolar junction transistor to operate in a hard-saturation region during the first time period and the second time period, and drive the bipolar junction transistor to operate in a quasi-saturation region during the third time period.
    Type: Application
    Filed: October 31, 2017
    Publication date: April 26, 2018
    Inventors: XIANGKUN ZHAI, Yuan Lin, XIAOMIN HUANG, LIEYI FANG
  • Patent number: 9843263
    Abstract: System and method for driving a bipolar junction transistor for a power converter. The system includes a current generator configured to output a drive current signal to a bipolar junction transistor to adjust a primary current flowing through a primary winding of a power converter. The current generator is further configured to output the drive current signal to turn on the bipolar junction transistor during a first time period, a second time period, and a third time period, the second time period separating the first time period from the third time period, drive the bipolar junction transistor to operate in a hard-saturation region during the first time period and the second time period, and drive the bipolar junction transistor to operate in a quasi-saturation region during the third time period.
    Type: Grant
    Filed: March 19, 2014
    Date of Patent: December 12, 2017
    Assignee: On-Bright Electronics (Shanghai) Co., Ltd.
    Inventors: Xiangkun Zhai, Yuan Lin, Xiaomin Huang, Lieyi Fang
  • Publication number: 20170179808
    Abstract: Systems and methods are provided for regulating a power conversion system. An example system controller includes a first controller terminal and a second controller terminal. The first controller terminal is configured to receive a first signal associated with an input signal for a primary winding of a power conversation system. The second controller terminal is configured to output a drive signal to a switch to affect a first current flowing through the primary winding of the power conversion system, the drive signal being associated with an on-time period, the switch being closed during the on-time period. The system controller is configured to adjust a duration of the on-time period based on at least information associated with the first signal.
    Type: Application
    Filed: December 6, 2016
    Publication date: June 22, 2017
    Inventors: Xiangkun Zhai, Yunchao Zhang, JUN ZHOU, LIEYI FANG