Patents by Inventor De-Hua Cao

De-Hua Cao 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).

  • Step motor driving apparatus
    Patent number: 7795835
    Abstract: A step motor driving apparatus includes a micro control unit (MCU), a pulse generator, a first step motor driver, a second step motor driver, and a communication port. The first step motor driver is configured for driving a first step motor and connected to the MCU. The second step motor driver is configured for driving a second step motor and connected to the MCU. The MCU is connected to the second step motor driver via the pulse generator. The pulse generator is configured to supply pulse signals to the second step motor driver. The communication port is connected to the MCU. The MCU receives a corresponding command from an external control apparatus via the communication port. The MCU selectively controls the first step motor driver to drive the first step motor or controls the second step motor driver to drive the second step motor according to the command.
    Type: Grant
    Filed: December 3, 2007
    Date of Patent: September 14, 2010
    Assignees: Hong Fu Jin Precision Industry (ShenZhen) Co., Ltd., Hon Hai Precision Industry Co., Ltd.
    Inventors: Teng-Tsung Huang, Guo-Jun Yu, Hua-Yong Xu, De-Hua Cao
  • STEP MOTOR DRIVING APPARATUS
    Publication number: 20090039821
    Abstract: A step motor driving apparatus includes a micro control unit (MCU), a pulse generator, a first step motor driver, a second step motor driver, and a communication port. The first step motor driver is configured for driving a first step motor and connected to the MCU. The second step motor driver is configured for driving a second step motor and connected to the MCU. The MCU is connected to the second step motor driver via the pulse generator. The pulse generator is configured to supply pulse signals to the second step motor driver. The communication port is connected to the MCU. The MCU receives a corresponding command from an external control apparatus via the communication port. The MCU selectively controls the first step motor driver to drive the first step motor or controls the second step motor driver to drive the second step motor according to the command.
    Type: Application
    Filed: December 3, 2007
    Publication date: February 12, 2009
    Applicants: HONG FU JIN PRECISION INDUSTRY (Shenzhen)CO., LTD., HON HAI PRECISION INDUSTRY CO., LTD.
    Inventors: TENG-TSUNG HUANG, GUO-JUN YU, HUA-YONG XU, DE-HUA CAO