Patents by Inventor Jung-Ik Ha

Jung-Ik Ha 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: 9401665
    Abstract: The disclosure relates to an electric power conversion apparatus, and capable of determining a minimum output voltage of a boost converter based on a voltage of the grid, and comparing the minimum output voltage of the converter with an input voltage of the converter, and controlling the operation of the converter based on the comparison result, thereby reducing the unnecessary operation and switching loss of the converter, the electric power conversion apparatus according to the invention comprises a converter; and a control unit configured to detect a grid voltage to determine a minimum output voltage of the converter based on the grid voltage, and control the operation of the converter based on an input voltage of the converter and the determined minimum output voltage.
    Type: Grant
    Filed: September 15, 2014
    Date of Patent: July 26, 2016
    Assignees: SNU R&DB FOUNDATION, LSIS CO., LTD.
    Inventors: Anno Yoo, Jung Ik Ha, Ho Joon Shin, Kwon Yub Hyung
  • Patent number: 9397590
    Abstract: A double wound rotor type motor with a constant alternating current or direct current power supply input and a control method thereof is disclosed. The wound rotor type motor includes: a stator in which a coil directly connected to a single phase grid power supply or a direct current power supply is wound; a rotor that is rotatably supported in the stator; a power conversion device that is attached to the rotor and controls a rotor current without connection of a separate external power supply; and a control circuit that is connected to the power conversion device and controls the power conversion device.
    Type: Grant
    Filed: April 5, 2013
    Date of Patent: July 19, 2016
    Assignee: SNU R&DB Foundation
    Inventors: Jung Ik Ha, Yong Su Han
  • Publication number: 20160190964
    Abstract: Disclosed herein are a motor driving apparatus and a controlling method thereof. The motor driving apparatus includes a motor having a rotor including a permanent magnet, and a stator, an inverter to supply a driving power to the motor, and a control unit to estimate a parameter using a startup estimation when a rotation speed of the rotor is less than a preset startup speed, to estimate the parameter using a driving estimation with compensating for a dead time when the rotation speed of the rotor is equal to or greater than the preset startup speed and a torque of the rotor is equal to or less than a preset driving torque, and to estimate the parameter using the driving estimation without the dead time compensation when the rotation speed of the rotor is equal to or greater than the preset startup speed and the torque of the rotor exceeds the preset driving torque.
    Type: Application
    Filed: December 30, 2015
    Publication date: June 30, 2016
    Inventors: Jong-Hyun Shin, Jin Woong Kim, Han Sol Seo, Jung-Ik Ha
  • Patent number: 9257933
    Abstract: A single external power supply variable speed induction motor and a control method thereof are disclosed. An induction motor includes: a stator in which coils directly connected to a single-phase or 3-phase or more systematic power supply are wound; a rotor that is supported to be rotatable in the stator; a power conversion device that is attached to the rotor and controls a rotor current without connection of a separate external power supply; and a control circuit that is connected to the power conversion device and controls the power conversion device.
    Type: Grant
    Filed: August 29, 2012
    Date of Patent: February 9, 2016
    Assignee: SNU R&DB FOUNDATION
    Inventors: Jung Ik Ha, Sung Min Kim, Seung Ki Sul, Yong Su Han
  • Publication number: 20150236625
    Abstract: A motor driving apparatus and a method of driving a plurality of permanent magnet synchronous motor (PMSM) using a single inverter is described. The motor driving apparatus includes a single power conversion apparatus configured to supply power to a plurality of motors and a control apparatus configured to control the power conversion apparatus to adjust a phase current ratio supplied to the plurality of motors from the single power conversion apparatus according to a requirement of each of the plurality of motors.
    Type: Application
    Filed: February 18, 2015
    Publication date: August 20, 2015
    Applicants: SAMSUNG ELECTRONICS CO., LTD., SNU R&DB FOUNDATION
    Inventors: Je Hyung Cho, Jung-Ik HA, Alexey Bodrov, Youngnam Kim
  • Patent number: 9112445
    Abstract: A winding synchronous machine having a moving object including an inverter circuit comprises: a moving-object inverter circuit connected to the moving object of the winding synchronous machine; and a moving-object circuit control device connected to the moving-object inverter circuit so as to control the moving-object inverter circuit. The moving-object circuit control device may comprise: a stator inverter voltage estimator estimating a high-frequency voltage of a stator inverter circuit; a field current reference generator generating a field current reference of the moving object; and an energy storage device voltage controller generating a current reference tracking a DC-link energy storage device voltage of the moving object. Problems associated with using a rare-earth permanent magnet can be thereby overcome, and a winding synchronous machine including an excitation circuit in which ripples almost never occur can be implemented without using an extra power source.
    Type: Grant
    Filed: April 18, 2011
    Date of Patent: August 18, 2015
    Assignee: SNU R&DB Foundation
    Inventors: Seung-Ki Sul, Jung-Ik Ha, Eunsoo Jung
  • Publication number: 20150229245
    Abstract: Disclosed herein is a power apparatus including a first motor, a second motor connected with the first motor in parallel, a driver configured to supply driving currents to the first and second motors, a current detector configured to detect the driving current of the first motor and the driving current of the second motor, a speed calculator configured to calculate a rotating speed of the first motor and a rotating speed of the second motor, and a controller configured to control the driver based on the rotating speed of the first motor, wherein the controller controls the driver so that the rotating speed of the first motor and the rotating speed of the second motor are the same as each other, when the rotating speed of the first motor and the rotating speed of the second motor are different from each other.
    Type: Application
    Filed: February 10, 2015
    Publication date: August 13, 2015
    Applicants: SAMSUNG ELECTRONICS CO., LTD., SNU R&DB FOUNDATION
    Inventors: Je Hyung CHO, Alexey BODROV, Yongjae LEE, Jung-Ik HA
  • Publication number: 20150188404
    Abstract: A power supply and a gate driver includes a power switching element to control current, a control circuit to output a control signal for opening or closing of the power switching element, and a gate drive circuit to open or close the power switching element in accordance with the control signal. The gate drive circuit includes a first inductive circuit connected to a supply voltage source, and a second inductive circuit connected to an input stage of the power switching element, and transfers electrical energy stored in the input stage of the power switching element, using the first and second inductive circuits. Accordingly, electrical energy supplied to the input stage of the power switching element during an ON state of the power switching element is again recovered during an OFF state of the power switching element.
    Type: Application
    Filed: December 9, 2014
    Publication date: July 2, 2015
    Applicants: Samsung Electronics Co., Ltd., SNU R&DB FOUNDATION
    Inventors: Jong Hyun SHIN, Jaeha KIM, Hyun Soo PARK, Jung-Ik HA, Taewook KANG
  • Publication number: 20150145466
    Abstract: A double wound rotor type motor with a constant alternating current or direct current power supply input and a control method thereof is disclosed. The wound rotor type motor includes: a stator in which a coil directly connected to a single phase grid power supply or a direct current power supply is wound; a rotor that is rotatably supported in the stator; a power conversion device that is attached to the rotor and controls a rotor current without connection of a separate external power supply; and a control circuit that is connected to the power conversion device and controls the power conversion device.
    Type: Application
    Filed: April 5, 2013
    Publication date: May 28, 2015
    Applicant: SNU R&DB FOUNDATION
    Inventors: Jung Ik Ha, Yong Su Han
  • Publication number: 20150078049
    Abstract: The disclosure relates to an electric power conversion apparatus, and capable of determining a minimum output voltage of a boost converter based on a voltage of the grid, and comparing the minimum output voltage of the converter with an input voltage of the converter, and controlling the operation of the converter based on the comparison result, thereby reducing the unnecessary operation and switching loss of the converter, the electric power conversion apparatus according to the invention comprises a converter; and a control unit configured to detect a grid voltage to determine a minimum output voltage of the converter based on the grid voltage, and control the operation of the converter based on an input voltage of the converter and the determined minimum output voltage.
    Type: Application
    Filed: September 15, 2014
    Publication date: March 19, 2015
    Applicants: SNU R&DB FOUNDATION, LSIS CO., LTD.
    Inventors: Anno YOO, Jung Ik HA, Ho Joon SHIN, Kwon Yub HYUNG
  • Publication number: 20140042953
    Abstract: The present invention relates to a winding synchronous machine having a moving object including an inverter circuit, wherein a winding synchronous machine, including a winding synchronous motor or generator having a moving object including an inverter circuit, is provided, the winding synchronous machine being characterized by comprising: a moving-object inverter circuit connected to the moving object of the winding synchronous machine; and a moving-object circuit control device connected to the moving-object inverter circuit so as to control the moving-object inverter circuit.
    Type: Application
    Filed: April 18, 2011
    Publication date: February 13, 2014
    Applicant: SNU R&DB FOUNDATION
    Inventors: Seung-Ki Sul, Jung-Ik Ha, Eunsoo Jung
  • Publication number: 20130057195
    Abstract: A single external power supply variable speed induction motor and a control method thereof are disclosed. An induction motor includes: a stator in which coils directly connected to a single-phase or 3-phase or more systematic power supply are wound; a rotor that is supported to be rotatable in the stator; a power conversion device that is attached to the rotor and controls a rotor current without connection of a separate external power supply; and a control circuit that is connected to the power conversion device and controls the power conversion device.
    Type: Application
    Filed: August 29, 2012
    Publication date: March 7, 2013
    Applicant: SNU R&DB FOUNDATION
    Inventors: Jung Ik HA, Sung Min KIM, Seung Ki SUL, Yong Su HAN
  • Patent number: 8362759
    Abstract: A phase current prediction method is disclosed. The phase current prediction method predicts current representative of a PWM period using a motor model which receives current measured through a single current sensor as an input, instead of the measured current, and determines the predicted current to be phase current.
    Type: Grant
    Filed: October 2, 2009
    Date of Patent: January 29, 2013
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Jung Ik Ha, Jong Ho Kim, Ho Sun Yoo, Hyung Sun You, Jang Hwan Kim
  • Patent number: 8024061
    Abstract: A method of and apparatus to generate a position profile using lower-order polynomials. The device includes a pattern coefficient generator to generate pattern and time coefficients of a position pattern that is classified by velocity change, a contour generator to generate a pattern polynomial to define a contour of each section of the position pattern using the generated pattern and time coefficients, and a dual filter for generating a position profile by selectively activating one of a plurality of filters, which receive the pattern polynomial generated by the contour generator. The device uses lower-order polynomials and a small number of coefficients, thereby reducing the number of calculations required in the procedure to generate the position profile. The device generates a seamless and smooth position profile by preventing switching errors due to the difference between filter sizes.
    Type: Grant
    Filed: May 19, 2005
    Date of Patent: September 20, 2011
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Jung Ik Ha
  • Publication number: 20100148753
    Abstract: A phase current prediction method is disclosed. The phase current prediction method predicts current representative of a PWM period using a motor model which receives current measured through a single current sensor as an input, instead of the measured current, and determines the predicted current to be phase current.
    Type: Application
    Filed: October 2, 2009
    Publication date: June 17, 2010
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Jung Ik Ha, Jong Ho Kim, Ho Sun Yoo, Hyung Sun You, Jang Hwan Kim
  • Patent number: 7045988
    Abstract: A speed control apparatus having a high frequency generator for superposing a high frequency signal on an estimated magnetic flux axis. A high frequency component extractor extracts an error signal of a magnetic flux position from a voltage or current detection signal having the same frequency component as a frequency component of the high frequency signal. A magnetic flux observer estimates a magnitude and a position of a magnetic flux. A first adaptive regulator adaptively regulates an error signal on a high frequency superposing side. A second adaptive regulator adaptively regulates an error signal on a magnetic flux observer side. A hybrid device switches the first adaptive regulator at a very low speed, the first and second adaptive regulators at a low speed and the second adaptive regulator at a high speed. A speed estimator estimates a speed from an output of the hybrid device.
    Type: Grant
    Filed: March 26, 2003
    Date of Patent: May 16, 2006
    Assignee: Kabushiki Kaisha Yaskawa Denki
    Inventors: Jung-Ik Ha, Kozo Ide
  • Publication number: 20050146306
    Abstract: It is an object of the invention to provide a sensorless control apparatus of an AC motor which can carry out a stable control within all driving ranges including a region having a zero speed and a zero output frequency.
    Type: Application
    Filed: March 26, 2003
    Publication date: July 7, 2005
    Inventors: Jung-ik Ha, Kozo Ide
  • Patent number: 6639380
    Abstract: A field orientation control method for an AC motor, which includes assuming an arbitrary axis as an estimated control axis in the synchronously rotating reference frame; injecting a high-frequency fluctuating signal to the estimated control axis; determining the position of a control axis using current, voltage or impedance on the estimated control axis in the synchronously rotating reference frame, generated by the injected high-frequency signal; and determining the position and speed of the rotor based on the control axis thus located. Since this method uses the variation of impedance caused by the induction machine's generation of field and by various shapes, the control performance is more stable than other conventional control methods. This AC motor's control method may be applied to control of torque, speed and position at a low speed where it is difficult to affix a detector and where a highly efficient operation is required.
    Type: Grant
    Filed: April 3, 2002
    Date of Patent: October 28, 2003
    Inventors: Seung-ki Sul, Jung-ik Ha
  • Publication number: 20030006723
    Abstract: A field orientation control method for an AC motor, which includes assuming an arbitrary axis as an estimated control axis in the synchronously rotating reference frame; injecting a high-frequency fluctuating signal to the estimated control axis; determining the position of a control axis using current, voltage or impedance on the estimated control axis in the synchronously rotating reference frame, generated by the injected high-frequency signal; and determining the position and speed of the rotor based on the control axis thus located. Since this method uses the variation of impedance caused by the induction machine's generation of field and by various shapes, the control performance is more stable than other conventional control methods. This AC motor's control method may be applied to control of torque, speed and position at a low speed where it is difficult to affix a detector and where a highly efficient operation is required.
    Type: Application
    Filed: April 3, 2002
    Publication date: January 9, 2003
    Inventors: Seung-ki Sul, Jung-ik Ha
  • Patent number: 5886498
    Abstract: The present invention is related to the method to find the rotor flux angle from stator voltages and currents by injecting high frequency signal. The injected signal is not rotating one but fluctuating one at a reference frame rotating synchronously to the fundamental stator frequency. The difference of impedances between the flux axis and the quadrature axis at high frequency signal injected on the rotor flux angle is explained by the equivalent circuit equation of the induction machine. The difference is verified by experiments on the test motors at various conditions. The sensorless field orientation control method is proposed and experimental results clarify the satisfactory operation of the method with 150% load torque at zero stator frequency.
    Type: Grant
    Filed: August 28, 1997
    Date of Patent: March 23, 1999
    Inventors: Seung-ki Sul, Jung-ik Ha