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).
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Patent number: 9401665Abstract: 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: GrantFiled: September 15, 2014Date of Patent: July 26, 2016Assignees: SNU R&DB FOUNDATION, LSIS CO., LTD.Inventors: Anno Yoo, Jung Ik Ha, Ho Joon Shin, Kwon Yub Hyung
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Patent number: 9397590Abstract: 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: GrantFiled: April 5, 2013Date of Patent: July 19, 2016Assignee: SNU R&DB FoundationInventors: Jung Ik Ha, Yong Su Han
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Publication number: 20160190964Abstract: 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: ApplicationFiled: December 30, 2015Publication date: June 30, 2016Inventors: Jong-Hyun Shin, Jin Woong Kim, Han Sol Seo, Jung-Ik Ha
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Patent number: 9257933Abstract: 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: GrantFiled: August 29, 2012Date of Patent: February 9, 2016Assignee: SNU R&DB FOUNDATIONInventors: Jung Ik Ha, Sung Min Kim, Seung Ki Sul, Yong Su Han
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Publication number: 20150236625Abstract: 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: ApplicationFiled: February 18, 2015Publication date: August 20, 2015Applicants: SAMSUNG ELECTRONICS CO., LTD., SNU R&DB FOUNDATIONInventors: Je Hyung Cho, Jung-Ik HA, Alexey Bodrov, Youngnam Kim
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Patent number: 9112445Abstract: 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: GrantFiled: April 18, 2011Date of Patent: August 18, 2015Assignee: SNU R&DB FoundationInventors: Seung-Ki Sul, Jung-Ik Ha, Eunsoo Jung
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Publication number: 20150229245Abstract: 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: ApplicationFiled: February 10, 2015Publication date: August 13, 2015Applicants: SAMSUNG ELECTRONICS CO., LTD., SNU R&DB FOUNDATIONInventors: Je Hyung CHO, Alexey BODROV, Yongjae LEE, Jung-Ik HA
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Publication number: 20150188404Abstract: 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: ApplicationFiled: December 9, 2014Publication date: July 2, 2015Applicants: Samsung Electronics Co., Ltd., SNU R&DB FOUNDATIONInventors: Jong Hyun SHIN, Jaeha KIM, Hyun Soo PARK, Jung-Ik HA, Taewook KANG
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Publication number: 20150145466Abstract: 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: ApplicationFiled: April 5, 2013Publication date: May 28, 2015Applicant: SNU R&DB FOUNDATIONInventors: Jung Ik Ha, Yong Su Han
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Publication number: 20150078049Abstract: 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: ApplicationFiled: September 15, 2014Publication date: March 19, 2015Applicants: SNU R&DB FOUNDATION, LSIS CO., LTD.Inventors: Anno YOO, Jung Ik HA, Ho Joon SHIN, Kwon Yub HYUNG
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Publication number: 20140042953Abstract: 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: ApplicationFiled: April 18, 2011Publication date: February 13, 2014Applicant: SNU R&DB FOUNDATIONInventors: Seung-Ki Sul, Jung-Ik Ha, Eunsoo Jung
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Publication number: 20130057195Abstract: 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: ApplicationFiled: August 29, 2012Publication date: March 7, 2013Applicant: SNU R&DB FOUNDATIONInventors: Jung Ik HA, Sung Min KIM, Seung Ki SUL, Yong Su HAN
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Patent number: 8362759Abstract: 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: GrantFiled: October 2, 2009Date of Patent: January 29, 2013Assignee: Samsung Electronics Co., Ltd.Inventors: Jung Ik Ha, Jong Ho Kim, Ho Sun Yoo, Hyung Sun You, Jang Hwan Kim
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Patent number: 8024061Abstract: 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: GrantFiled: May 19, 2005Date of Patent: September 20, 2011Assignee: Samsung Electronics Co., Ltd.Inventor: Jung Ik Ha
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Publication number: 20100148753Abstract: 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: ApplicationFiled: October 2, 2009Publication date: June 17, 2010Applicant: SAMSUNG ELECTRONICS CO., LTD.Inventors: Jung Ik Ha, Jong Ho Kim, Ho Sun Yoo, Hyung Sun You, Jang Hwan Kim
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Patent number: 7045988Abstract: 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: GrantFiled: March 26, 2003Date of Patent: May 16, 2006Assignee: Kabushiki Kaisha Yaskawa DenkiInventors: Jung-Ik Ha, Kozo Ide
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Publication number: 20050146306Abstract: 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: ApplicationFiled: March 26, 2003Publication date: July 7, 2005Inventors: Jung-ik Ha, Kozo Ide
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Patent number: 6639380Abstract: 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: GrantFiled: April 3, 2002Date of Patent: October 28, 2003Inventors: Seung-ki Sul, Jung-ik Ha
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Publication number: 20030006723Abstract: 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: ApplicationFiled: April 3, 2002Publication date: January 9, 2003Inventors: Seung-ki Sul, Jung-ik Ha
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Patent number: 5886498Abstract: 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: GrantFiled: August 28, 1997Date of Patent: March 23, 1999Inventors: Seung-ki Sul, Jung-ik Ha