Patents by Inventor Jiusheng Zhang

Jiusheng Zhang 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).

  • Methods and systems for LED driver having constant output current
    Patent number: 8344656
    Abstract: A control circuit for a switched mode power supply includes a transconductance amplifier circuit for receiving a voltage signal related to a current from an input of the power supply and producing a first signal, an analog signal processor coupled to the amplifier circuit for receiving the first signal and a second signal from the input of the power supply and a third signal from an output of the power supply. The analog signal processor is configured to produce a fourth signal as a function of the first, the second, and the third signals. An adder circuit is coupled to the fourth signal and a dimmer control signal, and the adder circuit is configured to output a fifth signal. A comparator circuit is coupled to the adder circuit for providing a control signal to a power transistor that controls current flow in the power supply based on comparison of the fifth signal and a reference signal.
    Type: Grant
    Filed: February 2, 2010
    Date of Patent: January 1, 2013
    Assignee: BCD Semiconductor Manufacturing Limited
    Inventors: Hongyue Du, Xinfeng Liu, Wei Zhang, Jiusheng Zhang, Hongbo Zhang
  • METHODS AND SYSTEMS FOR LED DRIVER HAVING CONSTANT OUTPUT CURRENT
    Publication number: 20110148324
    Abstract: A control circuit for a switched mode power supply includes a transconductance amplifier circuit for receiving a voltage signal related to a current from an input of the power supply and producing a first signal, an analog signal processor coupled to the amplifier circuit for receiving the first signal and a second signal from the input of the power supply and a third signal from an output of the power supply. The analog signal processor is configured to produce a fourth signal as a function of the first, the second, and the third signals. An adder circuit is coupled to the fourth signal and a dimmer control signal, and the adder circuit is configured to output a fifth signal. A comparator circuit is coupled to the adder circuit for providing a control signal to a power transistor that controls current flow in the power supply based on comparison of the fifth signal and a reference signal.
    Type: Application
    Filed: February 2, 2010
    Publication date: June 23, 2011
    Applicant: BCD Semiconductor Manufacturing Limited
    Inventors: Hongyue Du, Xinfeng Liu, Wei Zhang, Jiusheng Zhang, Hongbo Zhang