Patents Assigned to LSI
  • Modular multi-level converter
    Patent number: 9680392
    Abstract: Provided is a modular multi-level converter (MMC) including a plurality of sub-modules including switching elements, and a central control unit which assigns an address to each of the plurality of sub-modules for distinguishing each of the plurality of sub-modules, determines switching operation conditions of the plurality of sub-modules based on the assigned addresses, and outputs switching signals corresponding to the determined switching operation conditions. The central control unit determines a switching sequence of the plurality of the sub-modules according to the sequence of the assigned addresses.
    Type: Grant
    Filed: April 24, 2015
    Date of Patent: June 13, 2017
    Assignee: LSIS CO., LTD.
    Inventors: Woong Hyub Song, Young Woo Kim
  • Method for automatically setting ID in UART ring communication
    Patent number: 9678908
    Abstract: Disclosed is a method for automatically setting ID in UART ring communication in which a master and a plurality of slaves are formed in a ring-type network, the method including initializing the master to output a master ID (initializing step), receiving, by the plurality of slaves, the master ID, setting its own IDs by adding the master ID to a reference value and outputting the set ID (slave ID setting step), changing, by the plurality of slaves, its own IDs based on whether its own ID is same as the received ID, receiving, by the master, the IDs outputted by the plurality of slaves, and changing a currently highest value of slave IDs stored in the master in response to values of received slave IDs (changing step), and finishing the ID setting or re-setting the slave IDs, in response to the Current Max Slave ID (finish determining step).
    Type: Grant
    Filed: September 23, 2014
    Date of Patent: June 13, 2017
    Assignee: LSIS CO., LTD.
    Inventor: Bong Ki Lee
  • Earth leakage circuit breaker
    Patent number: 9678130
    Abstract: Disclosed is an earth leakage circuit breaker. The earth leakage circuit breaker is capable of determining an earth leakage signal applied thereto with high accuracy, by performing a trip operation by determining noise components included in the earth leakage signal, such as switching noise or harmonics, based on a determination signal generated by tracking the earth leakage signal. The earth leakage circuit breaker is capable of precisely determining whether to perform a trip operation with respect to an earth leakage signal applied thereto. The earth leakage circuit breaker is capable of preventing a malfunction due to a noise signal similar to an earth leakage signal.
    Type: Grant
    Filed: December 15, 2014
    Date of Patent: June 13, 2017
    Assignee: LSIS CO., LTD.
    Inventor: Jong Kug Seon
  • Magnetic switch
    Patent number: 9679725
    Abstract: The present invention relates to a magnetic switch, and more particularly, a magnetic switch capable of preventing degradation of breaking efficiency by utilizing magnetic force to the utmost, in a manner of matching contact centers of fixed and movable cores. A magnetic switch according to one embodiment includes a bobbin provided with a cylindrical body and a plurality of flanges and having a coil wound on an outer circumferential surface thereof, a fixed core fixed to an inside of the cylindrical body with a predetermined spaced interval from the cylindrical body, and a movable core slidably installed in the cylindrical body and contactable with or separated from the fixed core, wherein a guide portion protrudes from a lower portion of the cylindrical body along an inner circumferential surface of the cylindrical body, such that the movable core can linearly move along a central axis of the fixed core.
    Type: Grant
    Filed: December 30, 2015
    Date of Patent: June 13, 2017
    Assignee: LSIS CO., LTD.
    Inventor: Jinhee Park
  • Relay
    Patent number: 9673010
    Abstract: A relay according to one embodiment of the present invention includes a housing, a cylinder, a fixed contactor coupled to the housing, a movable contactor contactable with or separated from the fixed contactor, a coil assembly disposed in the housing to generate a magnetic field, a movable shaft coupled with the movable contactor at an upper portion thereof, a fixed core inserted into the cylinder, a moving core fixed to the movable shaft to move the movable shaft in a pressing manner, a wipe spring to supply elastic force to the movable shaft, and a return spring located between the fixed core and the moving core. The moving core includes a cylindrical protrusion extending toward the fixed core and surrounding the movable shaft.
    Type: Grant
    Filed: June 11, 2015
    Date of Patent: June 6, 2017
    Assignee: LSIS CO., LTD.
    Inventor: Su Jung Lee
  • Electric power meter capable of monitoring contact status of latch relay
    Patent number: 9671467
    Abstract: An electric power meter capable of monitoring a contact status of a latch relay, comprises: a latch relay having a pair of primary coils and a secondary contact, the secondary contact operable to a closed position or an open position, the primary coils configured to provide a magnetic force to open or close the secondary contact; and a meter controller configured to determine that the latch relay is in a closed position when the input voltage of the primary coils is substantially equal to the output voltage of the secondary contact with a predetermined allowable error range, and configured to determine that the latch relay is in an open position when the output voltage of the secondary contact has not been input, even if the input voltage of the primary coils has been input.
    Type: Grant
    Filed: March 23, 2015
    Date of Patent: June 6, 2017
    Assignee: LSIS CO., LTD.
    Inventor: Hyung Kyu Kim
  • Apparatus for delay angle compensation of flying start function
    Patent number: 9673734
    Abstract: An apparatus for delay angle compensation for flying start function in a medium-voltage inverter is disclosed. The apparatus generates generate a phase angle (?) by converting a three-phase voltage of an inverter output terminal to dq-axis voltages (Vd, Vq), and calculate a compensation phase angle by a predetermined delay time. In addition, the apparatus generates an initial angle for the flying start by aggregating the compensation phase angle with the phase angle (?). The apparatus may drive a high-voltage motor more stably, because an error between a command voltage phase angle and an actual output voltage phase angle may be reduced, when electric power of the medium voltage inverter is restored after a trip or an instantaneous blackout occurs.
    Type: Grant
    Filed: June 12, 2015
    Date of Patent: June 6, 2017
    Assignee: LSIS CO., LTD.
    Inventors: Sung Guk Ahn, Seung Cheol Choi
  • Bobbin
    Patent number: 9670030
    Abstract: This specification relates to a bobbin wound with a wire. The bobbin disclosed herein includes a winding main body on which a wire is wound, and a flange section that protrudes from both end portions of the winding main body to form an accommodation space of the wire, wherein the winding main body includes a first winding portion and a second winding portion that are arranged such that central axes thereof are aligned with each other, and configured to be stepped from each other due to a difference of diameters thereof, and a stopping jaw that protrudes from a winding portion with a relatively great diameter of the first winding portion and the second winding portion, whereby the wire can be prevented from being fallen down or loosened while being wound.
    Type: Grant
    Filed: October 27, 2014
    Date of Patent: June 6, 2017
    Assignee: LSIS CO., LTD.
    Inventor: Eung Nam Kim
  • Direct current relay
    Patent number: 9673009
    Abstract: Disclosed embodiments relate to a direct current relay. In some embodiments, a direct current relay is capable of reducing noise by attenuating an impact generated between a fixed core and a moving core during an ‘ON’ operation, and by attenuating an impact generated between a shaft and a middle plate during an ‘OFF’ operation.
    Type: Grant
    Filed: September 8, 2016
    Date of Patent: June 6, 2017
    Assignee: LSIS CO., LTD.
    Inventor: Junhyuk Yang
  • Control device for distributed generators
    Patent number: 9671842
    Abstract: A control device for a plurality of distributed generators connected to a main grid, the control device including a load power measuring unit measuring power consumption of loads connected to the plurality of distributed generators, a distributed generator power measuring unit measuring power output from the plurality of distributed generators, a power flow reference value determining unit determining a power flow reference value of a power line connected to the main grid based on the power consumption and the power output from the plurality of distributed generators, and a mode control unit changing an operation mode of one of the plurality of distributed generators such that a flow power of the power line connected to the main grid maintains the power flow reference value.
    Type: Grant
    Filed: June 28, 2013
    Date of Patent: June 6, 2017
    Assignee: LSIS CO., LTD.
    Inventor: Khanh-Loc Nguyen
  • System and method for evaluating surgical knot formation
    Patent number: 9667884
    Abstract: A system for evaluating surgical knot formation is disclosed. The system includes a first surgically relevant object, a pressure sensor, and at least one pair of suture ends passing through the pressure sensor and the first surgically relevant object. The system also includes a controller coupled to the pressure sensor and configured to 1) transform signals from the pressure sensor into a pressure map having pressure magnitudes from a plurality of locations on the pressure sensor corresponding to one or more knots which may be formed in the at least one pair of suture ends; and 2) format the pressure map for display.
    Type: Grant
    Filed: September 5, 2014
    Date of Patent: May 30, 2017
    Assignee: LSI Solutions, Inc.
    Inventors: Angelo John Martellaro, Jude S. Sauer
  • Rotation angle estimation module for sensorless vector control of PMSM
    Patent number: 9667186
    Abstract: A rotation angle estimation module is provided. The rotation angle estimation module includes: a fixed flux instruction estimation unit calculating a rotating flux (?sd, ?sq) and a fixed flux instruction (?s?*, ?s?*) based on a rotation angle ? and the current (Is?, Is?) of a fixed coordinate system; a fixed flux estimation unit calculating a fixed flux (?s?, ?s?) based on the voltage (Vs?, Vs?) of the fixed coordinate system, and the current (Is?, Is?) and fixed flux error (?s?, ?s?) of the fixed coordinate system; a fixed flux error estimation unit using the fixed flux instruction (?s?*, ?s?*) and the fixed flux (?s?, ?s?) to calculate the fixed flux error (?s?, ?s?) and feed the errors back to the fixed flux estimation unit; and a trigonometric function calculation unit calculating the rotation angle ? based on the rotating flux (?sd, ?sq) and the fixed flux (?s?, ?s?).
    Type: Grant
    Filed: April 10, 2015
    Date of Patent: May 30, 2017
    Assignee: LSIS CO., LTD.
    Inventor: Kwang Woon Kim
  • Bidirectional packet transfer fail-over switch for serial communication
    Patent number: 9660835
    Abstract: Disclosed is a bidirectional packet transfer fail-over switch for serial communication. The bidirectional packet transfer fail-over switch for serial communication includes a memory configured to divide packet data, which is transmitted or received for bidirectional communication between a plurality of communication devices, in units of certain data, and store the divided data, and a control unit configured to receive a trigger signal, indicating whether the packet data is received, from the memory, determine a priority according to an order where the packet data is received, and transmit the packet data to another communication device.
    Type: Grant
    Filed: November 13, 2014
    Date of Patent: May 23, 2017
    Assignee: LSIS CO., LTD.
    Inventor: Sung Sik Ham
  • Apparatus for determining start of electric machine
    Patent number: 9660562
    Abstract: An apparatus for determining start of electric machine is disclosed wherein a frequency of a 3-phase current inputted from a motor is estimated to determine whether the motor has started using a difference between the estimated frequency and a frequency of output voltage of inverter configured to drive the motor.
    Type: Grant
    Filed: June 19, 2014
    Date of Patent: May 23, 2017
    Assignee: LSIS CO., LTD.
    Inventor: Anno Yoo
  • Apparatus for controlling paralleled inverter
    Patent number: 9660552
    Abstract: An apparatus for controlling paralleled inverter is disclosed. In the apparatus for controlling paralleled inverter, one synchronization signal is shaped by at least two inverters to respectively transmit a voltage command and an operation command.
    Type: Grant
    Filed: November 12, 2014
    Date of Patent: May 23, 2017
    Assignee: LSIS CO., LTD.
    Inventor: Jong Je Park
  • Method for correcting electric power loss in an HVDC system
    Patent number: 9651589
    Abstract: A method for measuring electric power loss of a high voltage direct current (HVDC) system comprises the steps of measuring the amount of transmission electric power and the amount of receiving electric power; calculating a first electric power loss amount based on a difference value between the measured amount of the transmission electric power and the measured amount of the receiving electric power; calculating the amount of loss generated in each of positions in the HVDC system based on an impedance value of each of the positions; calculating a second electric power loss amount based on a sum value of the calculated loss amounts; and determining a correcting value for correcting the amount of electric power loss generated in the HVDC system based on a difference value between the first electric power loss amount and the second electric power loss amount.
    Type: Grant
    Filed: December 7, 2015
    Date of Patent: May 16, 2017
    Assignee: LSIS CO., LTD.
    Inventors: Yongkil Choi, Hoseok Choi
  • Apparatus for controlling induction machine
    Patent number: 9654042
    Abstract: An apparatus for controlling an induction motor is provided, the apparatus generates generating a d-axis current command and a q-axis current command of a torque command, estimating speed of a rotor of the motor, and correcting the d-axis and q-axis current commands by using the estimated speed, to enhances the rotor speed and position estimation performance by increasing the slip frequency.
    Type: Grant
    Filed: April 20, 2015
    Date of Patent: May 16, 2017
    Assignee: LSIS CO., LTD.
    Inventor: Anno Yoo
  • Battery device and energy storage system including the same
    Patent number: 9653921
    Abstract: Provided is an energy storage system including: a battery device that is configured from multiple battery unit modules; and a power converting system that is configured to be connected to the battery device and that converts electric power that is applied between an electric power system and the battery device, in which the battery device includes multiple switches, each of which establishes a connection between each of the battery unit modules and the power converting system.
    Type: Grant
    Filed: March 17, 2014
    Date of Patent: May 16, 2017
    Assignee: LSIS CO., LTD.
    Inventors: Anno Yoo, Sehoon Hwang
  • Protection system against reverse battery connection
    Patent number: 9653907
    Abstract: A protection system against reverse battery connection according to an embodiment includes a controller configured to output a first square wave signal including a third square wave signal and a fourth square wave signal to an input terminal of a transformer using a first DC voltage, the transformer configured to output a second square wave signal obtained by transforming the first square wave signal, a rectifier configured to rectify the second square wave signal to output a second DC voltage, and a transistor configured to perform protection against reverse connection of a battery using the second DC voltage.
    Type: Grant
    Filed: March 24, 2015
    Date of Patent: May 16, 2017
    Assignee: LSIS CO., LTD.
    Inventor: Jae Ho Lee
  • Deviation compensation method of potential transformer
    Patent number: 9654018
    Abstract: A deviation compensation method of a potential transformer is provided. The deviation compensation method includes: detecting an output voltage value of a first potential transformer; checking a compensation value applied to the first potential transformer; compensating for the output voltage value based on the compensation value to measure an actual voltage value for a location at which the first potential transformer is installed; verifying the validity of the measured actual voltage value; and resetting a deviation compensator measuring the actual voltage value according to a result of verification on the validity of the actual voltage value.
    Type: Grant
    Filed: April 24, 2015
    Date of Patent: May 16, 2017
    Assignee: LSIS CO., LTD.
    Inventor: Yong Kil Choi