Patents by Inventor Tian-Hua Liu

Tian-Hua Liu 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: 9143074
    Abstract: A method is for controlling a synchronous motor includes a stator, a rotor with a position and a speed, a direct axis and a quadrant axis. The method includes: providing a position control, a speed control and a current control programs; executing either the position control program or the speed control program to produce a quadrant axis current; executing the current control program; detecting the synchronous motor to obtain a first, a second and a third phase currents, and digitizing the three phase currents; using the three phase currents and the quadrant axis current to calculate a direct axis current; converting the direct axis current and quadrant axis current to a direct axis voltage command and quadrant axis voltage command; executing a pulse width modulation for the direct axis and the quadrant axis voltage commands, to get a trigger signal for controlling the synchronous motor.
    Type: Grant
    Filed: April 30, 2013
    Date of Patent: September 22, 2015
    Assignee: NATIONAL TAIWAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
    Inventors: Tian-Hua Liu, Ming-Yen Wei
  • Patent number: 8634979
    Abstract: A drive device and a drive control method for the electric bicycle are disclosed. The drive device of the electric bicycle is equipped with a power supply/storage unit, a compact motor, an inclination sensor, a brake actuation sensor, a pedal-rotating speed sensor and a drive control module. The drive device performs integrated calculations using the inclination information of the inclination sensor, the brake actuation information of the brake actuation sensor and the pedal-rotating speed information of the pedal-rotating speed sensor, so the drive control modules instructs the compact motor and the power supply/storage unit to quickly enter an auxiliary drive mode for rotating wheels of the electric bicycle, or to enter an energy recovery mode for storing electrical energy generated by the compact motor.
    Type: Grant
    Filed: June 18, 2012
    Date of Patent: January 21, 2014
    Assignee: Industrial Technology Research Institute
    Inventors: Shih-Hsiang Chien, Shih-Hsin Hsu, Tian-Hua Liu, Jui-Ling Chen, Yi-Hsuan Lee
  • Publication number: 20130138281
    Abstract: A drive device and a drive control method for the electric bicycle are disclosed. The drive device of the electric bicycle is equipped with a power supply/storage unit, a compact motor, an inclination sensor, a brake actuation sensor, a pedal-rotating speed sensor and a drive control module. The drive device performs integrated calculations using the inclination information of the inclination sensor, the brake actuation information of the brake actuation sensor and the pedal-rotating speed information of the pedal-rotating speed sensor, so the drive control modules instructs the compact motor and the power supply/storage unit to quickly enter an auxiliary drive mode for rotating wheels of the electric bicycle, or to enter an energy recovery mode for storing electrical energy generated by the compact motor.
    Type: Application
    Filed: June 18, 2012
    Publication date: May 30, 2013
    Applicant: INDUSTRIL TECHNOLOGY RESEARCH INSTITUTE
    Inventors: Shih-Hsiang CHIEN, Shih-Hsin HSU, Tian-Hua LIU, Jui-Ling CHEN, Yi-Hsuan LEE
  • Patent number: 8450959
    Abstract: The present disclosure related to a control method for a sensorless motor with energy recovery ability, using which duty cycle of a sensorless motor can be changed by the control of complementary switches so as to enable the sensorless motor to switch between a high efficiency driving operation and an energy recovery operation while being activated. Thereby, the conduction loss and the wear and tear to the switches can be minimized while simultaneously enhancing the energy recovery efficiency and thus improving the battery life.
    Type: Grant
    Filed: June 24, 2011
    Date of Patent: May 28, 2013
    Assignee: Industrial Technology Research Institute
    Inventors: Shih-Hsiang Chien, Shih-Hsin Hsu, Yee-Pien Yang, Tian-Hua Liu, Jui-Ling Chen
  • Publication number: 20120256575
    Abstract: The present disclosure related to a control method for a sensorless motor with energy recovery ability, using which duty cycle of a sensorless motor can be changed by the control of complementary switches so as to enable the sensorless motor to switch between a high efficiency driving operation and an energy recovery operation while being activated. Thereby, the conduction loss and the wear and tear to the switches can be minimized while simultaneously enhancing the energy recovery efficiency and thus improving the battery life.
    Type: Application
    Filed: June 24, 2011
    Publication date: October 11, 2012
    Applicant: INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE
    Inventors: Shih-Hsiang CHIEN, Shih-Hsin HSU, Yee-Pien YANG, Tian-Hua LIU, Jui-Ling CHEN
  • Patent number: 7589982
    Abstract: Disclosed is a synchronous forward converter having a reverse current suppressor connected to the gate of a freewheel switch. The reverse current suppressor is configured to receive a control input signal generated by an internal circuitry of a power supply system where the forward converter locates, such as an enable signal, to detect the power-off of the forward converter, and in response thereto turn off the freewheel switch during the interruption of the input power of the forward converter. Alternatively, the reverse current suppressor is configured to detect the decay of the input voltage across the input bulk capacitor located on the primary side of a transformer of the forward converter, and turn off the freewheel switch when the voltage across the secondary side of the transformer is decayed to be smaller than the output voltage of the forward converter.
    Type: Grant
    Filed: January 25, 2007
    Date of Patent: September 15, 2009
    Assignee: Delta Electronics, Inc.
    Inventors: Kuan-Sheng Wang, Tian-Hua Liu
  • Publication number: 20080055944
    Abstract: Disclosed is a synchronous forward converter having a reverse current suppressor connected to the gate of a freewheel switch. The reverse current suppressor is configured to receive a control input signal generated by an internal circuitry of a power supply system where the forward converter locates, such as an enable signal, to detect the power-off of the forward converter, and in response thereto turn off the freewheel switch during the interruption of the input power of the forward converter. Alternatively, the reverse current suppressor is configured to detect the decay of the input voltage across the input bulk capacitor located on the primary side of a transformer of the forward converter, and turn off the freewheel switch when the voltage across the secondary side of the transformer is decayed to be smaller than the output voltage of the forward converter.
    Type: Application
    Filed: January 25, 2007
    Publication date: March 6, 2008
    Applicant: Delta Electronics, Inc.
    Inventors: Kuan-Sheng Wang, Tian-Hua Liu