Patents by Inventor Weiwei Shao

Weiwei Shao 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).

  • Switched capacitor charge pump driver for piezoelectric actuator
    Patent number: 9093925
    Abstract: A switched capacitor charge pump driver for piezoelectric actuator includes a power source, a first switching capacitor and a piezoelectric actuating circuit, wherein during being at a first state, the first capacitor is charged by the power source; during being at a second state, the first capacitor is discharged to the piezoelectric actuator in the actuating circuit. The switched capacitor charge pump driver for piezoelectric actuator can expand the application of charge controller to a broader frequency range, especially at low frequencies and effectively decrease the hysteresis of piezoelectric stack over a large frequency range even at a quasistatic state. In addition, a method for driving piezoelectric actuator by a switched capacitor charge pump is provided.
    Type: Grant
    Filed: May 3, 2011
    Date of Patent: July 28, 2015
    Assignee: University of Science and Technology of China
    Inventors: Zhihua Feng, Yuting Ma, Liang Huang, Yongbin Liu, Weiwei Shao
  • SWITCHED CAPACITOR CHARGE PUMP DRIVER FOR PIEZOELECTRIC ACTUATOR
    Publication number: 20140062346
    Abstract: A switched capacitor charge pump driver for piezoelectric actuator includes a power source, a first switching capacitor and a piezoelectric actuating circuit, wherein during being at a first state, the first capacitor is charged by the power source; during being at a second state, the first capacitor is discharged to the piezoelectric actuator in the actuating circuit. The switched capacitor charge pump driver for piezoelectric actuator can expand the application of charge controller to a broader frequency range, especially at low frequencies and effectively decrease the hysteresis of piezoelectric stack over a large frequency range even at a quasistatic state. In addition, a method for driving piezoelectric actuator by a switched capacitor charge pump is provided.
    Type: Application
    Filed: May 3, 2011
    Publication date: March 6, 2014
    Applicant: University of Science and Technology of China
    Inventors: Zhihua Feng, Yuting Ma, Liang Huang, Yongbin Liu, Weiwei Shao