Patents by Inventor Soongkeun Lee
Soongkeun Lee 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: 11437937Abstract: A control circuit includes: a converter configured to convert alternating current (AC) power into direct current (DC) power, an inverter configured to generate driving power of at least one motor using the converted DC power, and a first core formed by winding a coil by a number of windings determined in correspondence with an impedance of the at least one motor. The number of windings is determined such that an impedance of the first core is inversely proportional to the impedance of the at least one motor and a driving power line for driving the at least one motor passes through a center of the first core.Type: GrantFiled: June 12, 2020Date of Patent: September 6, 2022Assignee: LG Electronics Inc.Inventor: Soongkeun Lee
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Patent number: 11296495Abstract: A surge protection circuit includes: a power supply unit configured to supply first power, a filter unit configured to filter noise of the first power while a current corresponding to a surge flows through the filter unit, a motor unit provided with at least one motor, a control unit configured to control the motor unit according to an operation mode, and a rectification unit provided with at least one protection capacitor and configured to rectify the filtered first power into second power. The filter unit is connected with a ground to thereby apply the current to the filter unit through the ground. A first impedance is generated by the filter unit and the rectification unit and a second impedance is generated by the control unit and the motor unit and a value of the first impedance is less than a value of the second impedance.Type: GrantFiled: June 12, 2020Date of Patent: April 5, 2022Assignee: LG Electronics Inc.Inventors: Soongkeun Lee, Gwigeun Park, Wonwoo Lee, Wonjae Yi
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Publication number: 20200395749Abstract: A surge protection circuit includes: a power supply unit configured to supply first power, a filter unit configured to filter noise of the first power while a current corresponding to a surge flows through the filter unit, a motor unit provided with at least one motor, a control unit configured to control the motor unit according to an operation mode, and a rectification unit provided with at least one protection capacitor and configured to rectify the filtered first power into second power. The filter unit is connected with a ground to thereby apply the current to the filter unit through the ground. A first impedance is generated by the filter unit and the rectification unit and a second impedance is generated by the control unit and the motor unit and a value of the first impedance is less than a value of the second impedance.Type: ApplicationFiled: June 12, 2020Publication date: December 17, 2020Inventors: Soongkeun LEE, Gwigeun PARK, Wonwoo LEE, Wonjae YI
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Publication number: 20200395874Abstract: A control circuit includes: a converter configured to convert alternating current (AC) power into direct current (DC) power, an inverter configured to generate driving power of at least one motor using the converted DC power, and a first core formed by winding a coil by a number of windings determined in correspondence with an impedance of the at least one motor. The number of windings is determined such that an impedance of the first core is inversely proportional to the impedance of the at least one motor and a driving power line for driving the at least one motor passes through a center of the first core.Type: ApplicationFiled: June 12, 2020Publication date: December 17, 2020Inventor: Soongkeun LEE
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Patent number: 10581274Abstract: A home appliance is disclosed, including a first circuit unit including a converter configured to convert an Alternating Current (AC) power into a Direct Current (DC) power, a first coil, a first modulator/demodulator configured to wirelessly transmit the DC power generated by the converter using the first coil, and a first controller configured to control the first modulator/demodulator, and a second circuit including a second coil configured to receive a wireless power transmitted by the first circuit unit, a second modulator/demodulator configured to convert the wireless power received from the second coil, a rectifier configured to rectify an AC power generated by the second modulator/demodulator, and a second controller configured to control operation of the second modulator/demodulator, wherein the first modulator/demodulator and the second modulator/demodulator perform bidirectional time-division data communication.Type: GrantFiled: November 1, 2017Date of Patent: March 3, 2020Assignees: LG ELECTRONICS INC., RESEARCH COOPERATION FOUNDATION OF YEUNGNAM UNIVERSITYInventors: Soongkeun Lee, Chungill Lee, Seonwook Park, Sungwoo Bae, Jaejung Yun, Jeongtae Kim, Younggeun Lee
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Patent number: 10199870Abstract: A home appliance is disclosed, including a motor, a drive unit configured to drive the motor, a first circuit unit including a main controller configured to control the drive unit, a display unit, and a second circuit unit including a display controller configured to control the display unit. The first circuit unit transmits wireless power to the second circuit unit, using a first frequency, and the second circuit unit transmits data to the first circuit unit, using a second frequency different from the first frequency. Thereby, wireless power transmission and bidirectional communication are performed between the first and second circuit units.Type: GrantFiled: June 2, 2016Date of Patent: February 5, 2019Assignee: LG ELECTRONICS INC.Inventors: Soongkeun Lee, Hoyong Jang, Chungill Lee
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Patent number: 10182694Abstract: A vacuum cleaner may include a cleaner body having a suction motor and a suctioning portion configured to be in communication with the cleaner body and to suction air and dust. One of a battery assembly having a battery or a cord reel assembly having a power cord may be installed in the cleaner body. The vacuum cleaner may also include a controller to control the suction motor by modifying a pulse width modulation (PWM) duty cycle of an inverter providing power to the suction motor based on whether the battery assembly or the cord reel assembly is installed in the cleaner body.Type: GrantFiled: August 12, 2016Date of Patent: January 22, 2019Assignee: LG ELECTRONICS INC.Inventors: Soongkeun Lee, Chungill Lee, Seongwoo Kim
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Publication number: 20180235422Abstract: Provided are a vacuum cleaner that uses both alternating current (AC) power and direct current (DC) power without a separate switch module, and a control method thereof. The cleaner includes a suction nozzle sucking a cleaning target, a suction connection part connected to the suction nozzle and allowing the sucked cleaning target to pass therethrough, and a main body separated from the suction nozzle and having a dust box collecting the cleaning target, wherein the main body includes a suction force generating unit installed in the main body to generate a suction force and a power supply unit detachably provided in the main body to apply a voltage to the suction force generating unit, wherein the power supply unit supplies power to the suction force generating unit using any one of a DC voltage and an AC voltage.Type: ApplicationFiled: August 12, 2016Publication date: August 23, 2018Inventors: Soongkeun LEE, Seongwoo KIM, Chungill LEE
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Publication number: 20180054089Abstract: A home appliance is disclosed, including a first circuit unit including a converter configured to convert an Alternating Current (AC) power into a Direct Current (DC) power, a first coil, a first modulator/demodulator configured to wirelessly transmit the DC power generated by the converter using the first coil, and a first controller configured to control the first modulator/demodulator, and a second circuit including a second coil configured to receive a wireless power transmitted by the first circuit unit, a second modulator/demodulator configured to convert the wireless power received from the second coil, a rectifier configured to rectify an AC power generated by the second modulator/demodulator, and a second controller configured to control operation of the second modulator/demodulator, wherein the first modulator/demodulator and the second modulator/demodulator perform bidirectional time-division data communication.Type: ApplicationFiled: November 1, 2017Publication date: February 22, 2018Inventors: Soongkeun LEE, Chungill LEE, Seonwook PARK, Sungwoo BAE, Jaejung YUN, Jeongtae KIM, Younggeun LEE
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Patent number: 9708745Abstract: The laundry treatment machine; absent a position sensor to sense a rotor position, includes a driving unit having a DC/AC inverter, an output voltage detection unit to detect output voltage applied to the motor, and an inverter controller to control the inverter to drive the motor based on the output voltage. The output voltage detection unit includes a plurality of resistors electrically connected between the inverter and the motor and a comparator to compare voltage detected by some of the resistors with reference voltage and to detect pulse width modulation (PWM)-based output voltage. Based on the PWM-based output voltage at least one switching device of the inverter is turned on. The output voltage detection unit outputs voltage detected by other some of the resistors to the inverter controller in a second mode in which all switching devices of the inverter are turned off.Type: GrantFiled: November 7, 2014Date of Patent: July 18, 2017Assignee: LG ELECTRONICS INC.Inventors: Hansu Jung, Soongkeun Lee, Minho Jang
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Patent number: 9708744Abstract: The laundry treatment machine includes an inverter to convert direct current (DC) voltage into alternating current (AC) voltage and to output the AC voltage to a motor. The laundry treatment machine includes an inverter controller to control the inverter to supply current corresponding to a direction opposite to back electromotive force generated from the motor to the motor so as to align the motor during a starting operation of the motor. It is feasible to rapidly align a rotor of the motor during the starting operation of the motor.Type: GrantFiled: November 7, 2014Date of Patent: July 18, 2017Assignee: LG ELECTRONICS INC.Inventors: Hansu Jung, Jain Koo, Soongkeun Lee
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Publication number: 20170047876Abstract: A motor driving apparatus included in a home appliance may include an inverter to convert a direct current (DC) power into an alternating current (AC) power through a switching operation and to output the converted AC power to a motor, an output current detector to detect an output current flowing through the motor, a controller to control the inverter, wherein, during a first interval after the motor stops, the controller controls a phase current of a predetermined frequency to flow through the motor to estimate a position of a rotor of the motor, and estimates the position of the rotor of the motor based on the detected output current while the phase current of the predetermined frequency flows through the motor. Thereby, the sensorless motor driving apparatus can easily estimate the position of the motor rotor.Type: ApplicationFiled: August 10, 2016Publication date: February 16, 2017Inventors: Soongkeun LEE, Chungill LEE, Seonwook PARK, Sungwoo BAE, Jaejung YUN, Jeongtae KIM, Younggeun LEE
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Publication number: 20170042400Abstract: A vacuum cleaner may include a cleaner body having a suction motor and a suctioning portion configured to be in communication with the cleaner body and to suction air and dust. One of a battery assembly having a battery or a cord reel assembly having a power cord may be installed in the cleaner body. The vacuum cleaner may also include a controller to control the suction motor by modifying a pulse width modulation (PWM) duty cycle of an inverter providing power to the suction motor based on whether the battery assembly or the cord reel assembly is installed in the cleaner body.Type: ApplicationFiled: August 12, 2016Publication date: February 16, 2017Inventors: Soongkeun LEE, Chungill LEE, Seongwoo KIM
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Publication number: 20160359372Abstract: A home appliance is disclosed, including a motor, a drive unit configured to drive the motor, a first circuit unit including a main controller configured to control the drive unit, a display unit, and a second circuit unit including a display controller configured to control the display unit. The first circuit unit transmits wireless power to the second circuit unit, using a first frequency, and the second circuit unit transmits data to the first circuit unit, using a second frequency different from the first frequency. Thereby, wireless power transmission and bidirectional communication are performed between the first and second circuit units.Type: ApplicationFiled: June 2, 2016Publication date: December 8, 2016Inventors: Soongkeun LEE, Hoyong Jang, Chungill Lee
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Publication number: 20150128661Abstract: The laundry treatment machine; absent a position sensor to sense a rotor position, includes a driving unit having a DC/AC inverter, an output voltage detection unit to detect output voltage applied to the motor, and an inverter controller to control the inverter to drive the motor based on the output voltage. The output voltage detection unit includes a plurality of resistors electrically connected between the inverter and the motor and a comparator to compare voltage detected by some of the resistors with reference voltage and to detect pulse width modulation (PWM)-based output voltage. Based on the PWM-based output voltage at least one switching device of the inverter is turned on. The output voltage detection unit outputs voltage detected by other some of the resistors to the inverter controller in a second mode in which all switching devices of the inverter are turned off.Type: ApplicationFiled: November 7, 2014Publication date: May 14, 2015Inventors: Hansu JUNG, Soongkeun Lee, Minho Jang
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Publication number: 20150128660Abstract: The laundry treatment machine includes an inverter to convert direct current (DC) voltage into alternating current (AC) voltage and to output the AC voltage to a motor. The laundry treatment machine includes an inverter controller to control the inverter to supply current corresponding to a direction opposite to back electromotive force generated from the motor to the motor so as to align the motor during a starting operation of the motor. It is feasible to rapidly align a rotor of the motor during the starting operation of the motor.Type: ApplicationFiled: November 7, 2014Publication date: May 14, 2015Inventors: Hansu Jung, Jain Koo, Soongkeun Lee