Patents by Inventor Huafei Ding

Huafei Ding 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: 11343886
    Abstract: A light-emitting element driving device and controller and dimming method for the light-emitting element driving device. The light-emitting driving device has a dimming resistor and a power converter. A first current is provided to the dimming resistor, and a voltage across the dimming resistor is compared with a first threshold voltage. Then a second current is provided according to the comparison result. A dimming signal is generated based the voltage across the dimming resistor and a current flowing through the dimming resistor, to control the power converter to drive a plurality of light-emitting elements. A plurality of voltage windows may be configured for the dimming signal. a 2-step dimming function may be activated for high precision.
    Type: Grant
    Filed: August 21, 2020
    Date of Patent: May 24, 2022
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Huafei Ding, Changxian Zhong
  • Publication number: 20210068220
    Abstract: A light-emitting element driving device and controller and dimming method for the light-emitting element driving device. The light-emitting driving device has a dimming resistor and a power converter. A first current is provided to the dimming resistor, and a voltage across the dimming resistor is compared with a first threshold voltage. Then a second current is provided according to the comparison result. A dimming signal is generated based the voltage across the dimming resistor and a current flowing through the dimming resistor, to control the power converter to drive a plurality of light-emitting elements. A plurality of voltage windows may be configured for the dimming signal. a 2-step dimming function may be activated for high precision.
    Type: Application
    Filed: August 21, 2020
    Publication date: March 4, 2021
    Inventors: Huafei Ding, Changxian Zhong
  • Patent number: 8848945
    Abstract: The present technology relates generally to a closed-loop power stage and audio amplifier circuits comprising the same. The present technology further provides a method for controlling an amplifier circuit. The closed-loop power stage is configured to receive a PWM input signal having a first frequency and a first duty cycle, a power supply voltage, and a bias signal related to the power supply voltage, and to output a square-wave signal having a second frequency and a second duty cycle. The closed-loop power stage comprises a feedback loop which is configured to regulate the second duty cycle of the square-wave signal in response to a variation in the power supply voltage. The audio amplifier circuit comprising the closed-loop power stage may have a stable output voltage and thus have good power supply rejection performance.
    Type: Grant
    Filed: June 10, 2011
    Date of Patent: September 30, 2014
    Assignee: Monolithic Power Systems, Inc.
    Inventors: Yunping Lang, Huijie Zhao, Huafei Ding
  • Publication number: 20110305353
    Abstract: The present technology relates generally to a closed-loop power stage and audio amplifier circuits comprising the same. The present technology further provides a method for controlling an amplifier circuit. The closed-loop power stage is configured to receive a PWM input signal having a first frequency and a first duty cycle, a power supply voltage, and a bias signal related to the power supply voltage, and to output a square-wave signal having a second frequency and a second duty cycle. The closed-loop power stage comprises a feedback loop which is configured to regulate the second duty cycle of the square-wave signal in response to a variation in the power supply voltage. The audio amplifier circuit comprising the closed-loop power stage may have a stable output voltage and thus have good power supply rejection performance.
    Type: Application
    Filed: June 10, 2011
    Publication date: December 15, 2011
    Inventors: Yunping Lang, Huijie Zhao, Huafei Ding