Patents by Inventor Lieyi Fang

Lieyi Fang 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: 10490998
    Abstract: Systems and methods are provided for protecting a power conversion system. A system controller includes a first controller terminal and a second controller terminal. The first controller terminal is configured to provide a drive signal to close and open a switch to affect a first current flowing through a primary winding of a power conversion system. The second controller terminal is configured to receive first input signals during one or more first switching periods and receive second input signals during one or more second switching periods. The system controller is configured to determine whether a temperature associated with the power conversion system is larger than a predetermined temperature threshold, and in response to the temperature associated with the power conversion system being larger than the predetermined temperature threshold, generate the drive signal to cause the switch open and remain open to protect the power conversion system.
    Type: Grant
    Filed: April 6, 2018
    Date of Patent: November 26, 2019
    Assignee: On-Bright Electronics (Shanghai) Co., Ltd.
    Inventors: Xiaomin Huang, Huawei Lyu, Qiang Luo, Lieyi Fang
  • Publication number: 20190357326
    Abstract: Systems and methods are provided herein for current regulation. An example system controller includes: a first controller terminal configured to receive an input voltage, the first controller terminal being further configured to allow a first current flowing into the system controller based at least in part on the input voltage in response to one or more switches being closed; a second controller terminal configured to allow the first current to flow out of the system controller through the second controller terminal in response to the one or more switches being closed; a fourth controller terminal coupled to the third controller terminal through a first capacitor, the first capacitor not being any part of the system controller; and an error amplifier configured to generate a compensation signal based at least in part on the current sensing signal, the error amplifier including a second capacitor.
    Type: Application
    Filed: March 20, 2019
    Publication date: November 21, 2019
    Inventors: Meng Li, Mingli Kang, Liqiang Zhu, Lieyi Fang
  • Patent number: 10483838
    Abstract: System and method for protecting a power converter. An example system controller for protecting a power converter includes a signal generator, a comparator, and a modulation and drive component. The signal generator is configured to generate a threshold signal. The comparator is configured to receive the threshold signal and a current sensing signal and generate a comparison signal based on at least information associated with the threshold signal and the current sensing signal, the current sensing signal indicating a magnitude of a primary current flowing through a primary winding of a power converter. The modulation and drive component is coupled to the signal generator.
    Type: Grant
    Filed: December 9, 2016
    Date of Patent: November 19, 2019
    Assignee: On-Bright Electronics (Shanghai) Co., Ltd.
    Inventors: Chao Yao, Yunchao Zhang, Yuan Lin, Zhiqiang Sun, Lieyi Fang
  • Patent number: 10483856
    Abstract: System controller and method for regulating a power converter. For example, the system controller includes a first controller terminal and a second controller terminal. The system controller is configured to receive, at the first controller terminal, an input signal, generate a drive signal based at least in part on the input signal, and output, at the second controller terminal, the drive signal to a switch to affect a current associated with a secondary winding of the power converter. The system controller is further configured to detect a first duration of a demagnetization period associated with the secondary winding based at least in part on the input signal, determine a second duration of a time period for the drive signal based at least in part on the first duration, and keep the drive signal at a first logic level during the entire time period.
    Type: Grant
    Filed: August 24, 2017
    Date of Patent: November 19, 2019
    Assignee: On-Bright Electronics (Shanghai) Co., Ltd.
    Inventors: Yaming Cao, Qiang Luo, Lieyi Fang
  • Publication number: 20190348908
    Abstract: System and method for protecting a power converter. An example system controller for protecting a power converter includes a signal generator, a comparator, and a modulation and drive component. The signal generator is configured to generate a threshold signal. The comparator is configured to receive the threshold signal and a current sensing signal and generate a comparison signal based on at least information associated with the threshold signal and the current sensing signal, the current sensing signal indicating a magnitude of a primary current flowing through a primary winding of a power converter. The modulation and drive component is coupled to the signal generator.
    Type: Application
    Filed: May 16, 2019
    Publication date: November 14, 2019
    Inventors: CHAO YAO, YUNCHAO ZHANG, YUAN LIN, ZHIQIANG SUN, LIEYI FANG
  • Publication number: 20190350060
    Abstract: System controller and method for a lighting system according to certain embodiments. For example, the system controller includes a first controller terminal configured to receive a first signal, and a second controller terminal coupled to a first transistor terminal of a transistor. The transistor further includes a second transistor terminal and a third transistor terminal. The second transistor terminal is coupled to a first winding terminal of a winding, and the winding further includes a second winding terminal coupled to a capacitor. Additionally, the system controller includes a third controller terminal coupled to the third transistor terminal of the transistor, and a fourth controller terminal coupled to a resistor and configured to receive a second signal. The second signal represents a magnitude of a current flowing through at least the winding, the third controller terminal, the fourth controller terminal, and the resistor.
    Type: Application
    Filed: April 16, 2019
    Publication date: November 14, 2019
    Inventors: ZHUOYAN LI, LIQIANG ZHU, XUEYOU LING, JUN ZHOU, 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: 20190348951
    Abstract: Systems and methods are provided for amplifying multiple input signals to generate multiple output signals. An example system includes a first channel, a second channel, and a third channel. The first channel is configured to receive one or more first input signals, process information associated with the one or more first input signals and a first ramp signal, and generate one or more first output signals. The second channel is configured to receive one or more second input signals, process information associated with the one or more second input signals and a second ramp signal, and generate one or more second output signals. The first ramp signal corresponds to a first phase. The second ramp signal corresponds to a second phase. The first phase and the second phase are different.
    Type: Application
    Filed: June 4, 2019
    Publication date: November 14, 2019
    Inventors: TINGZHI YUAN, Yaozhang Chen, Lieyi Fang
  • Publication number: 20190348914
    Abstract: Systems and methods are provided for regulating a power converter. An example system controller includes: a driver configured to output a drive signal to a switch to affect a current flowing through an inductive winding of a power converter, the drive signal being associated with a switching period including an on-time period and an off-time period. The switch is closed in response to the drive signal during the on-time period. The switch is opened 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. One minus the duty cycle is equal to a parameter. The system controller is configured to keep a multiplication product of the duty cycle, the parameter and the duration of the on-time period approximately constant.
    Type: Application
    Filed: March 6, 2019
    Publication date: November 14, 2019
    Inventors: Qian Fang, Cong Lan, Lieyi Fang
  • Publication number: 20190327811
    Abstract: System and method for providing at least an output current to one or more light emitting diodes. The system includes a control component configured to receive at least a demagnetization signal, a sensed signal and a reference signal and to generate a control signal based on at least information associated with the demagnetization signal, the sensed signal and the reference signal, and a logic and driving component configured to receive at least the control signal and output a drive signal to a switch based on at least information associated with the control signal. The switch is connected to a first diode terminal of a diode and a first inductor terminal of an inductor. The diode further includes a second diode terminal, and the inductor further includes a second inductor terminal.
    Type: Application
    Filed: March 20, 2019
    Publication date: October 24, 2019
    Inventors: LIEYI FANG, Jun Zhou
  • Publication number: 20190326820
    Abstract: System and method for regulating a power conversion system. An example system controller for regulating a power conversion system includes a first controller terminal associated with a first controller voltage and coupled to a first transistor terminal of a first transistor, the first transistor further including a second transistor terminal and a third transistor terminal, the second transistor terminal being coupled to a primary winding of a power conversion system, a second controller terminal associated with a second controller voltage and coupled to the third transistor terminal, and a third controller terminal associated with a third controller voltage. The first controller voltage is equal to a sum of the third controller voltage and a first voltage difference. The second controller voltage is equal to a sum of the third controller voltage and a second voltage difference.
    Type: Application
    Filed: February 22, 2019
    Publication date: October 24, 2019
    Inventors: Jiqing Yang, Jun Zhou, Liquaing Zhu, Qiang Luo, Lieyi Fang
  • Publication number: 20190326819
    Abstract: System and method are provided for protecting a power converter. The system includes a first comparator, and an off-time component. The first comparator is configured to receive a sensing signal and a first threshold signal and generate a first comparison signal based on at least information associated with the sensing signal and the first threshold signal, the power converter being associated with a switching frequency and further including a switch configured to affect the primary current. The off-time component is configured to receive the first comparison signal and generate an off-time signal based on at least information associated with the first comparison signal. The off-time component is further configured to, if the first comparison signal indicates the sensing signal to be larger than the first threshold signal in magnitude, generate the off-time signal to keep the switch to be turned off for at least a predetermined period of time.
    Type: Application
    Filed: January 24, 2019
    Publication date: October 24, 2019
    Inventor: LIEYI FANG
  • Publication number: 20190327810
    Abstract: Systems and methods for dimming control using TRIAC dimmers are provided. An example apparatus for a power conversion system includes: a process-and-drive component configured to receive an input signal and output a drive signal to a switch to affect a current that flows through a primary winding of a power conversion system. The input signal includes a first pulse associated with a first input period and a second pulse associated with a second input period. The drive signal is associated with a first modulation period for the first input period and a second modulation period for the second input period. The process-and-drive component is further configured to: determine the first modulation period for the first input period; change the drive signal between a first logic level and a second logic level at a modulation frequency during the first modulation period; determine the second modulation period for the second input period.
    Type: Application
    Filed: February 7, 2019
    Publication date: October 24, 2019
    Inventors: LIQIANG ZHU, JIQING YANG, ZHUOYAN LI, LIEYI FANG
  • Publication number: 20190327803
    Abstract: System and method for regulating one or more currents. The system includes a system controller, an inductor, a first resistor, a switch and a first diode. The system controller includes a first controller terminal and a ground terminal, the system controller being configured to output a drive signal at the first controller terminal. The inductor includes a first inductor terminal and a second inductor terminal, the first inductor terminal being coupled to the ground terminal, the second inductor terminal being coupled to one or more light emitting diodes. The first resistor includes a first resistor terminal and a second resistor terminal, the first resistor terminal being coupled to the ground terminal. The switch is configured to receive the drive signal and coupled to the second resistor terminal. The first diode includes a first diode terminal and a second diode terminal and coupled to the first resistor.
    Type: Application
    Filed: March 20, 2019
    Publication date: October 24, 2019
    Inventors: JUN ZHOU, Yunchao Zhang, Lieyi Fang
  • Publication number: 20190327804
    Abstract: System and method for regulating one or more currents. The system includes a system controller, an inductor, a first resistor, a switch and a first diode. The system controller includes a first controller terminal and a ground terminal, the system controller being configured to output a drive signal at the first controller terminal. The inductor includes a first inductor terminal and a second inductor terminal, the first inductor terminal being coupled to the ground terminal, the second inductor terminal being coupled to one or more light emitting diodes. The first resistor includes a first resistor terminal and a second resistor terminal, the first resistor terminal being coupled to the ground terminal. The switch is configured to receive the drive signal and coupled to the second resistor terminal. The first diode includes a first diode terminal and a second diode terminal and coupled to the first resistor.
    Type: Application
    Filed: March 20, 2019
    Publication date: October 24, 2019
    Inventors: JUN ZHOU, Yunchao Zhang, Lieyi Fang
  • Patent number: 10455657
    Abstract: System and method for dimming control of one or more light emitting diodes. An example system includes one or more signal processing components configured to receive a first signal associated with a TRIAC dimmer, process information associated with the first signal, determine whether the TRIAC dimmer is in a first condition or a second condition, generate a second signal based on at least information associated with the first signal, and send the second signal to a switch. The one or more signal processing components are further configured to, if the TRIAC dimmer is determined to be in the first condition, generate the second signal to cause the switch to be opened and closed corresponding to a modulation frequency.
    Type: Grant
    Filed: March 23, 2018
    Date of Patent: October 22, 2019
    Assignee: On-Bright Electronics (Shanghai) Co., Ltd.
    Inventors: Liqiang Zhu, Jun Zhou, Yongsheng Su, Lieyi Fang
  • Patent number: 10454378
    Abstract: System and method for regulating a power conversion system. A system controller for regulating a power conversion system includes an operation-mode-selection component and a driving component. The operation-mode-selection component is configured to receive a first signal related to an output load of the power conversion system and a second signal related to an input signal received by the power conversion system and output a mode-selection signal based on at least information associated with the first signal and the second signal. The driving component is configured to receive the mode-selection signal and generate a drive signal based on at least information associated with the mode-selection signal, the driving signal corresponding to a switching frequency.
    Type: Grant
    Filed: June 21, 2018
    Date of Patent: October 22, 2019
    Assignee: On-Bight Electronics (Shanghai) Co., Ltd.
    Inventors: Yuan Lin, Xiaomin Huang, Qiang Luo, Lieyi Fang
  • Patent number: 10448470
    Abstract: System and method for dimming control of one or more light emitting diodes. An example system includes one or more signal processing components configured to receive a first signal associated with a TRIAC dimmer, process information associated with the first signal, determine whether the TRIAC dimmer is in a first condition or a second condition, generate a second signal based on at least information associated with the first signal, and send the second signal to a switch. The one or more signal processing components are further configured to, if the TRIAC dimmer is determined to be in the first condition, generate the second signal to cause the switch to be opened and closed corresponding to a modulation frequency.
    Type: Grant
    Filed: June 15, 2018
    Date of Patent: October 15, 2019
    Assignee: On-Bright Electronics (Shanghai) Co., Ltd.
    Inventors: Liqiang Zhu, Jun Zhou, Yongsheng Su, Lieyi Fang
  • Patent number: 10448469
    Abstract: Systems and methods for dimming control using TRIAC dimmers are provided. An example apparatus for a power conversion system includes: a process-and-drive component configured to receive an input signal and output a drive signal to a switch to affect a current that flows through a primary winding of a power conversion system. The input signal includes a first pulse associated with a first input period and a second pulse associated with a second input period. The drive signal is associated with a first modulation period for the first input period and a second modulation period for the second input period. The process-and-drive component is further configured to: determine the first modulation period for the first input period; change the drive signal between a first logic level and a second logic level at a modulation frequency during the first modulation period; determine the second modulation period for the second input period.
    Type: Grant
    Filed: December 8, 2017
    Date of Patent: October 15, 2019
    Assignee: On-Bright Electronics (Shanghai) Co., Ltd.
    Inventors: Liqiang Zhu, Jiqing Yang, Zhuoyan Li, Lieyi Fang
  • Patent number: 10411604
    Abstract: System and method for regulating a power conversion system. A system controller for regulating a power conversion system includes a first controller terminal and a second controller terminal. Additionally, the system controller is configured to receive an input signal at the first controller terminal, and generate a drive signal at the second controller terminal based at least in part on the input signal to turn on or off a transistor in order to affect a current associated with a secondary winding of the power conversion system. Moreover, the system controller is further configured to determine whether the input signal is larger than a first threshold at a first time, in response to the input signal being determined to be larger than the first threshold at the first time, determine whether the input signal is smaller than a second threshold at a second time.
    Type: Grant
    Filed: July 7, 2016
    Date of Patent: September 10, 2019
    Assignee: On-Bright Electronics (Shanghai) Co., Ltd.
    Inventors: Yaming Cao, Zhenglan Xia, Yuan Lin, Qiang Luo, Lieyi Fang