Patents Assigned to LSIS Co., Ltd.
  • Patent number: 11293994
    Abstract: An earth leakage circuit breaker and a method of controlling the same are disclosed. An earth leakage circuit breaker according to the present disclosure can detect a type of leakage current and output the type of the leakage current in various forms such that a user can recognize the type of the leakage current. Therefore, the user can easily recognize whether or not the leakage current has occurred and the type of the leakage current. This may facilitate the user to recognize the cause of the leakage and take an effective measure for preventing an accident.
    Type: Grant
    Filed: September 18, 2019
    Date of Patent: April 5, 2022
    Assignee: LSIS CO., LTD.
    Inventors: Sunggyu Nam, Jongung Lim
  • Patent number: 11296639
    Abstract: The present invention relates to an inverter which is capable of adjusting an output frequency of a three-phase voltage output to a motor based on a result of comparison in magnitude between the minimum operating voltage of the motor and a DC link voltage applied to a DC link. The inverter includes: a measurement part configured to measure a DC link voltage applied to a DC link; a conversion part configured to convert the DC link voltage into a three-phase voltage and output the three-phase voltage to the motor; and a control part configured to make comparison in magnitude between the DC link voltage and the minimum operating voltage of the motor and adjust an output frequency of the three-phase voltage based on a result of the comparison.
    Type: Grant
    Filed: December 20, 2016
    Date of Patent: April 5, 2022
    Assignee: LSIS CO., LTD.
    Inventor: Hyo-Jin Kim
  • Patent number: 11277008
    Abstract: The energy storage system according to one embodiment comprises a first converter connected between the system and the DC distribution network, and converting an AC voltage of the system into a DC voltage and transmitting the DC voltage to the DC distribution network; a second converter connected to the DC distribution network and controlling the voltage of the DC distribution network; a battery connected to the second converter and of which the charging and discharging are controlled by the second converter; a third converter connected to the DC distribution network; and a first load connected to the third converter and of which the voltage is controlled by means of the third converter, wherein the first converter generates a power control instruction for controlling at least one of the battery and the first load on the basis of SOC information of the battery and power consumption information of the first load.
    Type: Grant
    Filed: April 20, 2018
    Date of Patent: March 15, 2022
    Assignee: LSIS CO., LTD.
    Inventors: Ji-Heon Lee, Dong-Jin Yun, Yun-Jae Lee, Min-Jae Kim, Ji-Hong Kim
  • Patent number: 11234348
    Abstract: Proposed is a heatsink module for an inverter. The heatsink module includes a housing a bottom face, both spaced side walls, and both flanges. The heatsink module include a heat-dissipation plate including a base fixed to the both flanges; and a plurality of heat-dissipation fins extending downward from a bottom of the base. The heatsink module includes a supporter interposed between the bottom face of the housing and the heat-dissipation fins. The supporter has slots defined therein for accommodating at least portions of the heat-dissipation fins respectively.
    Type: Grant
    Filed: August 13, 2019
    Date of Patent: January 25, 2022
    Assignee: LSIS CO., LTD.
    Inventor: Kyu-Hwa Kim
  • Patent number: 11223229
    Abstract: Disclosed is an uninterruptible power supply system comprising an energy storage system (ESS). The uninterruptible power supply system comprises an ESS and is connected to a grid, and further comprises: a first converter for converting an alternating current voltage of the grid into a direct current voltage; a second converter connected in series to the first converter, for converting the direct current voltage outputted from the first converter into an alternating current voltage and transferring same to a load; the ESS comprising a battery connected to a node between the first and second converter, for performing charging and discharging; and a PLC for receiving the operation statuses of the first and second converters, and on the basis thereof, controlling the operation of the uninterruptible power supply system, wherein the PLC determines the operation mode of the ESS by using the received operation statuses of the first and second converters.
    Type: Grant
    Filed: August 24, 2017
    Date of Patent: January 11, 2022
    Assignee: LSIS CO., LTD.
    Inventors: Ji-Heon Lee, Dong-Jin Yun, Ji-Hong Kim, Yun-Jae Lee, Min-Jae Kim
  • Patent number: 11211797
    Abstract: The present invention pertains to a microgrid system. A microgrid system according to an embodiment of the present invention is a microgrid system that is operated while separated from a power grid, wherein said microgrid system comprises: a first microgrid that includes a first load, a first ESS, a first distributed power system and a first controller; and a second microgrid that includes a second load, a second ESS, a second distributed power system and a second controller, and wherein a line connecting the first and the second microgrid is opened and closed using a relay, and the first and the second controller determine whether to open or close the relay by communicating with one another.
    Type: Grant
    Filed: May 11, 2018
    Date of Patent: December 28, 2021
    Assignee: LSIS CO., LTD.
    Inventor: Yil-Hwa Lee
  • Patent number: 11205951
    Abstract: A power conversion device comprises: a DC link capacitor charged with a DC power supplied from a power supply part; a fuse part, for breaking a current which is output from or supplied to the power supply part and has a first breaking magnitude or greater; a relay part which comprises a first relay for connecting a positive terminal of the fuse part to a positive terminal of the DC link capacitor and a second relay for connecting a negative terminal of the fuse part to a negative terminal of the DC link capacitor; an initial charge part, for charging the DC link capacitor by using DC power supplied from the power supply part; and a power conversion part for converting the direct-current power supplied from the power supply part into AC power when the DC link capacitor has been charged and supplying the alternating-current power to a load terminal.
    Type: Grant
    Filed: August 2, 2017
    Date of Patent: December 21, 2021
    Assignee: LSIS CO., LTD.
    Inventor: Jae-Hoon Jang
  • Patent number: 11205902
    Abstract: The present disclosure relates to an energy storage system for managing power of a system and a DC power distribution network linked with the system. In one embodiment, the system comprises a first converter connected between the system and the DC power distribution network so as to control voltage of the DC power distribution network; a second converter connected to the DC power distribution network; a battery which is connected to the second converter and in which a charging/discharging operation is controlled by the second converter; a third converter connected to the DC power distribution network; an emergency generator which is connected to the third converter and in which a power is controlled by the third converter; a fourth converter connected to the DC power distribution network; and a first load which is connected to the fourth converter and in which a voltage is controlled by the fourth converter.
    Type: Grant
    Filed: April 20, 2018
    Date of Patent: December 21, 2021
    Assignee: LSIS CO., LTD.
    Inventors: Ui-Jai Lim, Young-Geun Kim, Il-Hyung Lim, Do-Hyun Kim
  • Patent number: 11186675
    Abstract: The disclosure describes an epoxy resin composition and a transformer including the same. The epoxy resin composition according to an embodiment of the present invention includes an epoxy resin having a glycol-based functional group in a main chain, a filler, a curing agent, and an imidazole-based catalyst, and the transformer according to an embodiment includes an insulated conductor wound in multiple layers in a vertical direction; a semi-conductive layer which is provided on the insulated conductor and disperses a concentrated electric field; and an insulator which is casted on the insulated conductor and the semi-conductive layer and forms an outer shape of the transformer, and the insulator consists of the epoxy resin composition including the epoxy resin having the glycol-based functional group in the main chain, the filler, the curing agent, and the imidazole-based catalyst.
    Type: Grant
    Filed: June 4, 2018
    Date of Patent: November 30, 2021
    Assignee: LSIS CO., LTD.
    Inventors: Sang-Eon Kim, Wook-Dong Cho, Heon-Seop Song, Tae-Yun Kang, Han-Gil Kim, Hyeon-Jeong Choi
  • Patent number: 11189994
    Abstract: The present disclosure relates to a circuit breaker equipped with an energy release device of a switching mechanism, and particularly, to a circuit breaker equipped with an energy release device that allows energy of a closing spring of a switching mechanism to be automatically discharged at the time of a withdrawal operation.
    Type: Grant
    Filed: September 27, 2019
    Date of Patent: November 30, 2021
    Assignee: LSIS CO., LTD.
    Inventor: Moonsub Lee
  • Patent number: 11177098
    Abstract: A DC circuit breaker having an arc blowout device according to the present invention comprises: a fixed contact; a movable contact operating so as to make contact with or separate from the fixed contact; an operation part for driving the movable contact; and a blowout device which provides a magnetic field in a direction crossing the arc generated when the movable contact is separated, wherein the blowout device includes: a pair of core plates arranged side by side on both sides of the movable contact and the fixed contact; core rods integrally connected to the core plates, respectively, and having symmetrical shapes to each other; and a blowout coil coupled to one of the core rods.
    Type: Grant
    Filed: September 7, 2017
    Date of Patent: November 16, 2021
    Assignee: LSIS CO., LTD.
    Inventors: Ji-Hong Park, Hye-Lim Yoon, Jae-Seop Kim
  • Patent number: 11139675
    Abstract: The present invention relates to a hybrid energy storage system. The hybrid energy storage system according to an embodiment of the present invention manages the power of a system and a direct current (DC) distribution network connected to the system, and comprises: a first DC-DC converter connected to the DC distribution network; a super capacitor connected to the first DC-DC converter and having the charge and discharge thereof controlled by the first DC-DC converter; a second DC-DC converter connected to the DC distribution network; and a battery connected to the second DC-DC converter and having the charge and discharge thereof controlled by the second DC-DC converter, wherein the first DC-DC converter comprises a DC distribution network stabilization controller, which filters the noise of a system voltage applied to the DC distribution network, and then generates a damping current so as to stabilize the DC distribution network.
    Type: Grant
    Filed: August 9, 2017
    Date of Patent: October 5, 2021
    Assignee: LSIS CO., LTD.
    Inventors: Ji-Heon Lee, Ji-Hong Kim
  • Patent number: 11128128
    Abstract: The present disclosure relates to a directional over-current ground relay (DOCGR) for performing a protective relay of the power source system such as a micro-grid system using communications between an SV-remote terminal unit (SV-RTU) and the DOCGR, wherein the SV-RTU is configured for measuring voltage and current of the distributed power source system and thus generating a sampled value (SV) signal. Further, the present disclosure relates to a method for operating the DOCGR.
    Type: Grant
    Filed: August 24, 2018
    Date of Patent: September 21, 2021
    Assignee: LSIS CO., LTD.
    Inventor: Su-Hyeong Jang
  • Patent number: 11102088
    Abstract: The present invention relates to a communication data modeling method. The communication data modeling method according to one embodiment of the present invention comprises the steps of: identifying a service list of an electronic device; making a first communication data sheet for communication protocol standards of the electronic device; making a second communication data sheet for products related to the electronic device; making a final communication data sheet by combining the first communication data sheet and the second communication data sheet; and creating a communication data model on the basis of the final communication data sheet.
    Type: Grant
    Filed: July 31, 2017
    Date of Patent: August 24, 2021
    Assignee: LSIS CO., LTD.
    Inventors: Hun Park, Young-Gyu Yu, Jae-Shik Yoon, Seong-Joon Lee
  • Patent number: 11075521
    Abstract: The present invention relates to an energy storage system.
    Type: Grant
    Filed: May 10, 2018
    Date of Patent: July 27, 2021
    Assignee: LSIS CO., LTD.
    Inventor: Ji-Heon Lee
  • Patent number: 11056302
    Abstract: A coil control device of an electronic magnetic contactor, comprises: an input power processing unit configured to convert and output an input power into a direct current power; an input voltage detecting unit configured to detect a voltage level of the direct current power outputted from the input power processing unit; a control unit configured to output a control signal for controlling current flowing in a coil using the voltage level detected by the input voltage detecting unit; and a switching unit configured to connect or cutoff the current flowing in the coil by switching according to the control signal from the control unit, wherein the control unit includes a gate driver electrically connected with the switching unit and configured to block noise from the coil.
    Type: Grant
    Filed: September 27, 2019
    Date of Patent: July 6, 2021
    Assignee: LSIS CO., LTD.
    Inventor: Hyungeun Cho
  • Patent number: 11049677
    Abstract: The DC interrupting device includes a main current conduction unit including a main interrupting switch, which is a mechanical switch, a reverse current power supply unit connected to an input terminal of the main current conduction unit and configured to generate a predetermined reverse current, and a reverse current conduction unit configured to supply the reverse current to an output terminal of the main current conduction unit. The reverse current power supply unit includes a first reverse current dedicated capacitor charged by a voltage applied to an input terminal of the main current conduction unit, a polarity reversing inductor configured to reverse a polarity of the first reverse current dedicated capacitor, and a reverse current power supply unit switch configured to perform circuit connection such that the polarity reversing inductor reverses the polarity of the first reverse current dedicated capacitor.
    Type: Grant
    Filed: December 19, 2017
    Date of Patent: June 29, 2021
    Assignees: KOREA ELECTRO TECHNOLOGY RESEARCH INSTITUTE, LSIS CO., LTD.
    Inventors: Woo Young Lee, Hae Yong Park, Gyeong Ho Lee, Sang Hun Park, Chae Yoon Bae, Jung Wook Sim, Hyun Jae Jang
  • Patent number: 11038436
    Abstract: A unit power cell of an inverter system, according to one embodiment of the present invention, comprises: a first leg including first and fourth switching elements, which are connected in series to each other, second and third switching elements, which are connected in series with each other between a connection point of the first and second switching elements and a smoothing unit, and first, second, third and fourth diodes, which are inversely and respectively connected in parallel with the first, second, third and fourth switching elements; and a second leg connected in parallel with the first leg and including fifth and sixth switching elements, which are connected in series to each other, and fifth and sixth diodes, which are inversely and respectively connected in parallel with the fifth and sixth switching elements.
    Type: Grant
    Filed: July 18, 2018
    Date of Patent: June 15, 2021
    Assignee: LSIS CO., LTD.
    Inventors: Sung-Guk Ahn, Seung-Ki Sul, Hyun-Sam Jung, Jeong-Mock Yoo
  • Patent number: 11026341
    Abstract: A switching module may include a plurality of cooling plates stacked along a vertical direction, a switch disposed between the cooling plates, a first supporting member disposed below the lowermost cooling plate, a second supporting member disposed above the uppermost cooling plate, first and second pressing support portions disposed between the lowermost cooling plate and the first supporting member, and a pressing member disposed between the uppermost cooling plate and the second supporting member.
    Type: Grant
    Filed: February 19, 2019
    Date of Patent: June 1, 2021
    Assignee: LSIS CO., LTD.
    Inventor: Teagsun Jung
  • Patent number: 11025091
    Abstract: A hierarchical power control system associated with a cloud server includes a first microgrid cell, a second microgrid cell, a third microgrid cell, a middleware server, and an integrated control system. The first microgrid cell includes a first energy storage system (ESS) having an uninterruptible power supply (UPS) structure and a first load having a power state managed by the first energy storage system (ESS). The second microgrid cell includes a second load and a second energy storage system (ESS) for managing a power state of the second load. The third microgrid cell includes a third load. The middleware server communicates with the first to third microgrid cells. The integrated control system receives power supply-demand state information of the first to third microgrid cells through the middleware server, and establishes an integrated operation schedule based on the received power supply-demand state information of the first to third microgrid cells.
    Type: Grant
    Filed: March 13, 2020
    Date of Patent: June 1, 2021
    Assignee: LSIS CO., LTD.
    Inventors: Jae-Seong Shim, Myung-Hwan Lee, Yong-Hark Shin