Patents by Inventor Yong Hyok Ji
Yong Hyok Ji 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: 9054601Abstract: Disclosed are a maximum power point tracker, a power conversion controller, a power conversion device having an insulating structure, and a method for tracking maximum power point. The power conversion device includes: a DC/AC converter including a primary DC chopper unit having a primary switch, a transformer, and an AC/AC conversion unit including a secondary switch; a current detector detecting current from an input stage of the DC/AC converter and providing a detected current value; a voltage detector detecting a system voltage from an output stage of the DC/AC converter; and a power conversion controller generating a primary PWM signal to be provided to the primary DC chopper unit and secondary first and second PWM signals, having the mutually opposing phases, to be provided to the AC/AC conversion unit by using the detected current value and the system voltage.Type: GrantFiled: March 15, 2013Date of Patent: June 9, 2015Assignees: SAMSUNG ELECTRO-MECHANICS CO., LTD., SUNGKYUNKWAN UNIVERSITY FOUNDATION FOR CORPORATION COLLABORATIONInventors: Jin Wook Kim, Tae Won Lee, Dong Seong Oh, Yong Hyok Ji, Byoung Kuk Lee, Chung Yuen Won, Jae Hyung Kim, Young Ho Kim
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Patent number: 8867238Abstract: Disclosed herein is an electric generating system using a solar cell which converts a voltage generated in the solar cell into an Alternating Current (AC) voltage, and applies the converted voltage to a power system. The electric generating system includes; a Direct Current (DC)/DC converter that converts the voltage generated in the solar cell into a DC voltage, and has a synchronous rectifier including a synchronous switch; and a controller that detects one of a phase and a voltage of the power system, and selectively connects the synchronous switch of the synchronous rectifier in accordance with one of the phase and voltage of the power system. Here, the electric generating system reduces a conduction loss, and increases overall efficiency of the electric generation system.Type: GrantFiled: May 2, 2012Date of Patent: October 21, 2014Assignees: Samsung Electro-Mechanics Co., Ltd., Sungkyunkwan University Foundation for Corporate CollaborationInventors: Tae Won Lee, Kwang Soo Choi, Min Ho Heo, Jeong Kyu Park, Chung Yuen Won, Yong Hyok Ji, Young Ho Kim, Tae Hoon Kim
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Patent number: 8837177Abstract: An electric generating system using a solar cell improves the quality of output power by including a converter for converting an output voltage generated from the solar cell into DC voltage in a pulse shape. An inverter converts the DC voltage in the pulse shape into an AC voltage and applies the AC voltage to a power system and a control device for determining whether an erroneous operation of the electric generating system using the solar cell is generated or not based on an output voltage of the solar cell, an output current of the solar cell and a voltage of the power system. At least one inverter switching device among a plurality of inverter switching devices performs a switching at a frequency higher than a frequency during a normal operation at an interval where the erroneous operation is generated.Type: GrantFiled: March 6, 2012Date of Patent: September 16, 2014Assignees: Samsung Electro-Mechanics Co., Ltd., Sungkyunkwan University Foundation for Corporate CollaborationInventors: Tae Won Lee, Yong Hyok Ji, Young Ho Kim, Doo Young Song, Min Ho Heo, Tae Hoon Kim, Se Ho Lee, Chung Yuen Won
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Patent number: 8755202Abstract: Disclosed herein is an electric generating system using a solar cell, including: a DC/DC converter that converts output voltage generated from a solar cell into DC voltage and has a converter switching device; a snubber device that has a snubber switch clamping voltage applied to the converter switching device; and a control device that detects the voltage applied to the converter switching device and controls an operation of the snubber switch according to a detected voltage level applied to the converter switching device, thereby increasing the efficiency of the electric generating system using a solar cell while reducing switching loss and conduction loss.Type: GrantFiled: February 2, 2012Date of Patent: June 17, 2014Assignees: Samsung Electro-Mechanics Co., Ltd., Sungkyunkwan University Foundation for Corporate CollaborationInventors: Tae Won Lee, Young Ho Kim, Yong Hyok Ji, Doo Young Song, Min Ho Heo, Tae Hoon Kim, Chung Yuen Won
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Patent number: 8736111Abstract: There is provided an apparatus for the anti-islanding of a power conditioning system. The apparatus for the anti-islanding of a power conditioning system according to the present invention is applied to a power conditioning system including a DC/DC converter and a DC/AC inverter in order to transfer power from a solar cell array to a grid. The apparatus for the anti-islanding of a power conditioning system may include an injection signal generator generating an injection signal, an adder generating a final fundamental wave command value, a main controller performing the power control according to the final fundamental wave command value and stopping the operation of the power conditioning system when the level of the detected injection signal has reached the predetermined reference level or more, and an injection signal detector detecting the injection signal included in voltage and providing them to the main controller.Type: GrantFiled: November 19, 2010Date of Patent: May 27, 2014Assignees: Samsung Electro-Mechanics Co., Ltd., Sungkyunkwan University Foundation for Corporate CollaborationInventors: Doo Young Song, Tae Hoon Kim, Tae Won Lee, Don Sik Kim, Jin Wook Kim, Jae Hyung Kim, Jun Gu Kim, Yong Hyok Ji, Chung Yuen Won, Byoung Kuk Lee
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Publication number: 20140085944Abstract: There are provided a DC-AC power converting apparatus including no capacitor or a small capacity capacitor for removing a ripple in an input terminal thereof by charging or discharging power according to a difference between output power and instantaneous system power of a photovoltaic cell, and a solar power supplying apparatus including the same, the DC-AC power converting apparatus including a DC-AC power converting unit converting DC power into AC power, and a charging and discharging unit charging surplus power induced when a level of the DC power is higher than that of the AC power and discharging the charged power when the level of the DC power is lower than that of the AC power.Type: ApplicationFiled: February 19, 2013Publication date: March 27, 2014Applicants: Research & Business Foundation Sungkyunkwan University, SAMSUNG ELECTRO-MECHANICS CO., LTD.Inventors: Tae Won LEE, Min Ho HEO, Jun Gu KIM, Chung Yuen WON, Yong Hyok JI, Young Ho KIM, Doo Young SONG, Gyu Dong KIM
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Publication number: 20130286698Abstract: There are provided a power converting apparatus and an operating method thereof, and a solar power generation system. The power converting apparatus for a solar power generation system includes: a power converting unit converting an input signal generated by a solar cell module into an output signal; and a control circuit unit controlling an operation of the power converting unit, wherein the power converting unit includes at least one transformer, and a current sensor and a switching circuit connected to a primary winding of the at least one transformer, and the control circuit unit calculates a voltage and a current of the input signal using a current of the primary winding of the at least one transformer sensed by the current sensor and performs a maximum power point tracking (MPPT) control so that the power converting unit is operated at a maximum power point.Type: ApplicationFiled: August 24, 2012Publication date: October 31, 2013Inventors: Tae Won Lee, Min Ho Heo, Doo Young Song, Ju Suk Kang, Yong Hyok Ji, Jun Gu Kim, Young Ho Kim, Chun Yuen Won
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Patent number: 8514599Abstract: There is provided an apparatus and method for controlling a switch of a flyback converter for a solar generating system. The apparatus for controlling a switch of a flyback converter for a solar generating system includes: an MPPT controller generating a current command value for a maximum power point tracker of a solar cell module, based on input voltage, input current, and output voltage of the flyback converter; a current controller generating a current control signal for tracking the current command value; an output current command value generator generating the phase and magnitude command value of the output current, based on the phase of the output voltage and the current control signal; and a switch controller controlling the main switch of the flyback converter, based on the phase and magnitude command value of the output current, thereby simplifying a circuit while solving disadvantages of a discontinuous conduction mode and a boundary conduction mode.Type: GrantFiled: March 24, 2011Date of Patent: August 20, 2013Assignees: Samsung Electro-Mechanics Co., Ltd, Sungkyunkwan UniversityInventors: Tae Won Lee, Doo Young Song, Ku Yong Kim, Jin Wook Kim, Chung Yuen Won, Young Ho Kim, Byoung Kuk Lee, Yong Hyok Ji, Don Sik Kim, Tae Hoon Kim
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Patent number: 8493758Abstract: There are provided a method and an apparatus for generating a current command value for tracking the maximum power point of a solar energy generating system. The apparatus includes: a voltage detector detecting a voltage input into the flyback power converter; a first calculator calculating an output power from the detected input voltage; a second calculator calculating a power variation based on the calculated output power and a voltage variation of the input voltage; and a current command value generator generating a current command value for tracking the maximum power point of the solar cell module from the calculated voltage variation and the calculated power variation. Accordingly, a current command value after calculating an output power may be generated with only a voltage detector, without a current detector, thereby reducing the costs of a solar energy generating system by decreasing the costs for a high-priced current detector, and simplifying circuit.Type: GrantFiled: November 8, 2011Date of Patent: July 23, 2013Assignees: Samsung Electro-Mechanics Co., Ltd., Research & Business Foundation Sungkyunkwan UniversityInventors: Tae Won Lee, Yong Hyok Ji, Chung Yuen Won, Don Sik Kim, Doo Young Song, Min Ho Heo, Jin Wook Kim, Tae Hoon Kim, Young Ho Kim
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Publication number: 20130121038Abstract: Disclosed herein are a converter, a method for controlling the same, and an inverter. The converter includes: an input terminal having power input thereto; a first converter unit converting the power input to the input terminal to thereby output the converted power to an output terminal; and a second converter unit connected between the input terminal and the output terminal while being in parallel with the first converter unit, wherein each of the first and second converter units includes an active clamp unit provided at a primary side thereof and a synchronous rectifying unit provided at a secondary side thereof.Type: ApplicationFiled: May 29, 2012Publication date: May 16, 2013Inventors: Dong Kyun RYU, Tae Won LEE, Young Ho KIM, Chung Yuen WON, Yong Hyok JI
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Patent number: 8422258Abstract: Disclosed are a maximum power point tracker, a power conversion controller, a power conversion device having an insulating structure, and a method for tracking maximum power point. The power conversion device includes: a DC/AC converter including a primary DC chopper unit having a primary switch, a transformer, and an AC/AC conversion unit including a secondary switch; a current detector detecting current from an input stage of the DC/AC converter and providing a detected current value; a voltage detector detecting a system voltage from an output stage of the DC/AC converter; and a power conversion controller generating a primary PWM signal to be provided to the primary DC chopper unit and secondary first and second PWM signals, having the mutually opposing phases, to be provided to the AC/AC conversion unit by using the detected current value and the system voltage.Type: GrantFiled: September 14, 2010Date of Patent: April 16, 2013Assignees: Samsung Electro-Mechanics Co., Ltd., Sungkyunkwan University Foundation for Corporate CollaborationInventors: Jin Wook Kim, Tae Won Lee, Dong Seong Oh, Yong Hyok Ji, Byoung Kuk Lee, Chung Yuen Won, Jae Hyung Kim, Young Ho Kim
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Patent number: 8406022Abstract: There are provided an apparatus and a method for controlling the power quality of a power generation system. According to the present invention, there is provided an apparatus for controlling the power quality of a power generation system including a DC/AC inverter converting DC voltage into AC voltage and supplying inverter current to a grid, including: a grid voltage phase follower generating a grid signal; a fundamental extractor extracting a magnitude of a fundamental wave of a load current introduced into a non-linear load connected between the DC/AC inverter and the grid; a first calculator subtracting a preset current compensation value from the magnitude of the fundamental wave from the fundamental extractor; and a second calculator generating an inverter current instruction value for the DC/AC inverter by using the output value of the first calculator and the grid signal and the load current from the grid voltage phase follower.Type: GrantFiled: October 18, 2010Date of Patent: March 26, 2013Assignees: Samsung Electro-Mechanics Co., Ltd., Sungkyunkwan University Foundation for Corporate CollaborationInventors: Tae Hoon Kim, Jae Hyung Kim, Jun Gu Kim, Yong Hyok Ji, Chung Yuen Won, Doo Young Song, Byoung Kuk Lee, Dong Seong Oh, Tae Won Lee, Jin Wook Kim
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Publication number: 20130003425Abstract: Disclosed herein is an electric generating system using a solar cell which converts a voltage generated in the solar cell into an Alternating Current (AC) voltage, and applies the converted voltage to a power system. The electric generating system includes; a Direct Current (DC)/DC converter that converts the voltage generated in the solar cell into a DC voltage, and has a synchronous rectifier including a synchronous switch; and a controller that detects one of a phase and a voltage of the power system, and selectively connects the synchronous switch of the synchronous rectifier in accordance with one of the phase and voltage of the power system. Here, the electric generating system reduces a conduction loss, and increases overall efficiency of the electric generation system.Type: ApplicationFiled: May 2, 2012Publication date: January 3, 2013Inventors: Tae Won Lee, Kwang Soo Choi, Min Ho Heo, Jeong Kyu Park, Chung Yuen Won, Yong Hyok Ji, Young Ho Kim, Tae Hoon Kim
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Publication number: 20120268970Abstract: An electric generating system using a solar cell improves the quality of output power by including a converter for converting an output voltage generated from the solar cell into a DC voltage in a pulse shape. An inverter converts the DC voltage in the pulse shape into an AC voltage and applies the AC voltage to a power system and a control device for determining whether an erroneous operation of the electric generating system using the solar cell is generated or not based on an output voltage of the solar cell, an output current of the solar cell and a voltage of the power system. At least one inverter switching device among a plurality of inverter switching devices performs a switching at a frequency higher than a frequency during a normal operation at an interval where the erroneous operation is generated.Type: ApplicationFiled: March 6, 2012Publication date: October 25, 2012Inventors: Tae Won Lee, Yong Hyok Ji, Young Ho Kim, Doo Young Song, Min Ho Heo, Tae Hoon Kim, Se Ho Lee, Chung Yuen Won
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Publication number: 20120257422Abstract: Disclosed herein is an electric generating system using a solar cell, including: a DC/DC converter that converts output voltage generated from a solar cell into DC voltage and has a converter switching device; a snubber device that has a snubber switch clamping voltage applied to the converter switching device; and a control device that detects the voltage applied to the converter switching device and controls an operation of the snubber switch according to a detected voltage level applied to the converter switching device, thereby increasing the efficiency of the electric generating system using a solar cell while reducing switching loss and conduction loss.Type: ApplicationFiled: February 2, 2012Publication date: October 11, 2012Inventors: Tae Won Lee, Young Ho Kim, Yong Hyok Ji, Doo Young Song, Min Ho Heo, Tae Hoon Kim, Chung Yuen Won
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Publication number: 20120170320Abstract: There are provided a method and an apparatus for generating a current command value for tracking the maximum power point of a solar energy generating system. The apparatus includes: a voltage detector detecting a voltage input into the flyback power converter; a first calculator calculating an output power from the detected input voltage; a second calculator calculating a power variation based on the calculated output power and a voltage variation of the input voltage; and a current command value generator generating a current command value for tracking the maximum power point of the solar cell module from the calculated voltage variation and the calculated power variation. Accordingly, a current command value after calculating an output power may be generated with only a voltage detector, without a current detector, thereby reducing the costs of a solar energy generating system by decreasing the costs for a high-priced current detector, and simplifying circuit.Type: ApplicationFiled: November 8, 2011Publication date: July 5, 2012Applicants: RESEARCH & BUSINESS FOUNDATION SUNGKYUNKWAN UNIVERSITY, SAMSUNG ELECTRO-MECHANICS CO., LTD.Inventors: Tae Won LEE, Yong Hyok JI, Chung Yuen WON, Don Sik KIM, Doo Young SONG, Min Ho HEO, Jin Wook KIM, Tae Hoon KIM, Young Ho KIM
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Publication number: 20120026758Abstract: There is provided an apparatus and method for controlling a switch of a flyback converter for a solar generating system. The apparatus for controlling a switch of a flyback converter for a solar generating system includes: an MPPT controller generating a current command value for a maximum power point tracker of a solar cell module, based on input voltage, input current, and output voltage of the flyback converter; a current controller generating a current control signal for tracking the current command value; an output current command value generator generating the phase and magnitude command value of the output current, based on the phase of the output voltage and the current control signal; and a switch controller controlling the main switch of the flyback converter, based on the phase and magnitude command value of the output current, thereby simplifying a circuit while solving disadvantages of a discontinuous conduction mode and a boundary conduction mode.Type: ApplicationFiled: March 24, 2011Publication date: February 2, 2012Applicants: SUNGKYUNKWAN UNIVERSITY, SAMSUNG ELECTRO-MECHANICS CO., LTD.Inventors: Tae Won LEE, Doo Young SONG, Ku Yong KIM, Jin Wook KIM, Chung Yuen WON, Young Ho KIM, Byoung Kuk LEE, Yong Hyok JI, Don Sik KIM, Tae Hoon KIM
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Publication number: 20110309684Abstract: There is provided an apparatus for the anti-islanding of a power conditioning system. The apparatus for the anti-islanding of a power conditioning system according to the present invention is applied to a power conditioning system including a DC/DC converter and a DC/AC inverter in order to transfer power from a solar cell array to a grid. The apparatus for the anti-islanding of a power conditioning system may include an injection signal generator generating an injection signal, an adder generating a final fundamental wave command value, a main controller performing the power control according to the final fundamental wave command value and stopping the operation of the power conditioning system when the level of the detected injection signal has reached the predetermined reference level or more, and an injection signal detector detecting the injection signal included in voltage and providing them to the main controller.Type: ApplicationFiled: November 19, 2010Publication date: December 22, 2011Applicants: SUNGKYUNKWAN UNIVERSITY Foundation for Corporate Collaboration, SAMSUNG ELECTRO-MECHANICS CO., LTD.Inventors: Doo Young SONG, Tae Hoon KIM, Tae Won LEE, Don Sik KIM, Jin Wook KIM, Jae Hyung KIM, Jun Gu KIM, Yong Hyok JI, Chung Yuen WON, Byoung Kuk LEE
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Publication number: 20110255307Abstract: There are provided an apparatus and a method for controlling the power quality of a power generation system. According to the present invention, there is provided an apparatus for controlling the power quality of a power generation system including a DC/AC inverter converting DC voltage into AC voltage and supplying inverter current to a grid, including: a grid voltage phase follower generating a grid signal; a fundamental extractor extracting a magnitude of a fundamental wave of a load current introduced into a non-linear load connected between the DC/AC inverter and the grid; a first calculator subtracting a preset current compensation value from the magnitude of the fundamental wave from the fundamental extractor; and a second calculator generating an inverter current instruction value for the DC/AC inverter by using the output value of the first calculator and the grid signal and the load current from the grid voltage phase follower.Type: ApplicationFiled: October 18, 2010Publication date: October 20, 2011Applicants: SUNGKYUNKWAN UNIVERSITY Foundation for Corporate Collaboration, SAMSUNG ELECTRO-MECHANICS CO., LTD.Inventors: Tae Hoon KIM, Jae Hyung KIM, Jun Gu KIM, Yong Hyok JI, Chung Yuen WON, Doo Young SONG, Byoung Kuk LEE, Dong Seong OH, Tae Won LEE, Jin Wook KIM
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Publication number: 20110242857Abstract: Disclosed are a maximum power point tracker, a power conversion controller, a power conversion device having an insulating structure, and a method for tracking maximum power point. The power conversion device includes: a DC/AC converter including a primary DC chopper unit having a primary switch, a transformer, and an AC/AC conversion unit including a secondary switch; a current detector detecting current from an input stage of the DC/AC converter and providing a detected current value; a voltage detector detecting a system voltage from an output stage of the DC/AC converter; and a power conversion controller generating a primary PWM signal to be provided to the primary DC chopper unit and secondary first and second PWM signals, having the mutually opposing phases, to be provided to the AC/AC conversion unit by using the detected current value and the system voltage.Type: ApplicationFiled: September 14, 2010Publication date: October 6, 2011Applicants: SAMSUNG ELECTRO-MECHANICS CO., LTD., SUNGKYUNKWAN UNIVERSITY Foundation for Corporate CollaborationInventors: Jin Wook KIM, Tae Won LEE, Dong Seong OH, Yong Hyok JI, Byoung Kuk LEE, Chung Yuen WON, Jae Hyung KIM, Young Ho KIM