Abstract: An apparatus and a method for controlling an inverter are disclosed. The apparatus determines a 3-phase current by receiving a 2-phase current from a leg-shunt resistor arranged at an emitter terminal of a lower switching element in an inverter unit of an inverter, and determines whether there is an abnormality generated in the 3-phase current, to correct the abnormality in the current.

Abstract: Disclosed is a Battery Disconnect Unit that is good in assemblability and couplability because a middle cover accommodated in a lower case stably supports a relay terminal and a guide bar and a hood structure are applied to the middle cover. The BDU is disposed between a battery and an inverter to stably supply or break power of the battery to a power system of a vehicle. The BDU includes a lower case provided in a box shape with a top opened and a middle cover accommodated into and coupled to the lower case to press the relay terminal. A relay terminal hole into which a relay terminal is fitted is disposed on a bottom of the lower case, and an electric component is mounted on a top of the middle cover. A first fixing hook capable of being fastened to the lower case is provided in the middle cover.

Abstract: The present disclosure relates to a motor protection relay and a method for starting a motor of the motor protection relay, and particularly, to a motor protection relay capable of softly starting a motor, without a separate starting device, and performing soft starting of the motor more stably, effectively, and simply, by variably controlling start power for starting the motor to the motor through controlling of the relay itself and supplying the variably controlled start power to the motor, and a method for starting a motor thereof.

Abstract: A method for controlling energy storage device includes determining whether the operating frequency of the system falls within a dead band range corresponding to a preset frequency range, determining whether an SOC level indicating the charging amount of the energy storage device falls within a preset maintaining range, in a case where the operating frequency falls within the dead band range, and adjusting the SOC level so that the SOC level falls within the maintaining range in a case where the operating frequency of the system falls within the dead band range and the SOC level is outside the preset maintaining range, wherein the maintaining range represents a range between a preset lower limit and a preset upper limit.

Abstract: A controller for confirming the contact status of a latch relay embedded in an electric power meter according to the invention includes a microcomputer unit that is electrically connected to the latch relay for reading and providing the contact switching status information of the latch relay during a power failure, and read the contact switching status information stored during the power failure when a power recovers, and configured to output an opening control signal to the latch relay when the read contact switching status is an open state, and configured to output a closing control signal to the latch relay when the read contact switching status is a closed state; and a non-volatile memory that stores the contact switching status information of the latch relay provided by the microcomputer unit or provides the contact switching status information of the latch relay to the microcomputer unit during a power failure.

Abstract: A redundant control device of a high voltage direct current (HVDC) transmission system is provided. The redundant control device includes a first system and a second system that performs a function corresponding to that of the first system; and a first change over logic (COL) and a second COL that determine whether to switch between the first system and the system, wherein there are optical communication modules between the first system and the first COL, between the first COL and the second COL, and between the second system and the second COL to transmit and receive data, and the first COL and the second COL includes a monitoring control unit that checks a connection or wiring state of the optical communication modules and validity of transmission data.

Abstract: A power management system is provided. The power management system includes a battery energy storage system (BESS) configured to obtain a state of charge (SOC) information, the state of charge (SOC) information including a charge state of the battery and a charging control unit configured to control charging or discharging of the BESS. The charging control unit is configured to compare a desired SOC and a measured SOC based on the obtained SOC information, and regulate a charging power value of a battery and a discharging power of the battery to match with the desired SOC, when as a result of comparison, the desired SOC and the measured SOC are different from each other.

Abstract: A method for checking an IP address collision is provided. The method includes: transmitting an ARP (Access Resolution Protocol) request message by setting an IP address of the PLC Ethernet communication module as a destination; receiving an ARP reply message responding to the ARP request message; determining whether an MAC (Media Access Control) address included in the ARP reply message is identical to an MAC address of the PLC Ethernet communication module; and determining that an IP address collision occurs, when the MAC (Media Access Control) address included in the ARP reply message is not identical to the MAC address of the PLC Ethernet communication module.

Abstract: An inverter which supplies a load-adaptive boost voltage and drives an induction motor includes a reference voltage determining unit configured to determine a reference voltage according to a reference frequency on the basis of a predetermined a relationship between a voltage and a frequency, an inverter unit configured to drive the induction motor according to the reference voltage, and an automatic torque boost voltage calculation unit configured to determine an automatic torque boost voltage value according to a magnitude of an output current from the inverter to the induction motor, wherein the reference voltage determining unit adds a preset manual boost voltage value and an automatic torque boost voltage value to the reference voltage and outputs the resultant voltage value as a final reference voltage.

Abstract: Disclosed is a molded case circuit breaker including a case configured to accommodate an element for trip, an upper cover detachable attached to the case, a dial configured to include a fixing plate, which is provided to protrude along an outer circumference surface thereof, and a first stopper disposed under the fixing plate, a crossbar moved by the dial, a first dial fitting hole provided in the upper cover for the dial to be fitted into the first dial fitting hole, and a dial rotation adjusting unit provided in the first dial fitting hole and fitted between the fixing plate and the first stopper to guide a rotation of the dial, the dial rotation adjusting unit including a plurality of fitting grooves arranged at certain intervals. The first stopper is fitted into and fixed to the plurality of fitting grooves according to the rotation of the dial.

Abstract: An inverter system is provided. In the inverter system according to the present disclosure, adjacently arranged four switching elements among U phase and V phase switching elements configured in an NPC/H bridge manner are converted to an ON state to bypass a voltage applied from a DC link capacitor.

Abstract: Disclosed is a power supply system. A power supply system according to an embodiment includes a system control unit configured to set a first system droop curve for a plurality of batteries and a charging control unit configured to control charging/discharging of the plurality of batteries on the basis of the first system droop curve.

Abstract: A vehicle charging device is provided. The vehicle charging device is connected between an external power source and a vehicle and provides power for vehicle charging. The vehicle charging device includes: a sensing unit sensing whether a current to be provided to the vehicle is in a normal range, a relay unit selectively cutting off a current passing through the sensing unit from being supplied to a vehicle side, a bypass unit connected to the relay unit in parallel and selectively configuring a bypass circuit for the current passing through the sensing unit, and a controller controlling operations of the bypass unit and relay unit according to a current value measured through the sensing unit.

Abstract: A luminaire may include an input connection that receives AC line voltage, one or more chains of LEDs, and one or more drivers for driving each chain of LEDs, all within a housing, which may be in the form of a canopy. Each chain of LEDs may contain at least 36 LEDs connected in series. Each LED may have a power rating of no more than 1 watt and may be oriented to direct light outside of the housing when illuminated. Each driver may receive power that is extracted from AC line voltage connected to the input connection and provide one or more outputs that drive at least one of the chains of LEDs.

Abstract: An electronic component case for a vehicle is provided. The electronic component case includes a case body having a first space in which electronic components are disposed and a second space, which has an opening that is opened to the outside, defined adjacent to the first space to receive heat generated from the electronic components, wherein a coolant for cooling the electronic components is introduced into and discharged from the second space, and a cover disposed on the case body to seal the opening of the second space. The cover includes a first cover sealing the opening and a second cover sealing the opening and having one surface on which a first cooling part for increasing a surface area of the second cover is disposed. The first cover and the second cover are compatible with each other.

Abstract: A medium voltage inverter system is provided. The inverter system includes a controller configured to short-circuit the output terminal of the inverter unit when failure occurs, a supply unit configured to supply an electric power to the controller, and an auxiliary rectifying unit configured to rectify the AC voltage provided through the input terminal and to supply the rectified AC voltage to the supply unit.

Abstract: The present invention relates to an auxiliary contact mechanism of an electromagnetic contactor, and more particularly, to an auxiliary contact mechanism of an electromagnetic contactor capable of maximizing a time duration for which power is supplied to a magnetic coil for switching a main contact until the main contact is closed. The auxiliary contact mechanism of an electromagnetic contactor, includes: a case formed to have a box shape; an auxiliary sliding member installed above the case, and moving up and down by receiving a pressure from a main contact sliding member; an elastic member accommodated in an insertion groove formed in the auxiliary sliding member; a pressing member insertion-installed below the auxiliary sliding member, and moving up and down by an elastic force of the elastic member; and a micro switch turned on/off by the pressing member.

Abstract: This invention is suitable for directly driving from an alternating current (AC) line voltage source an array of LED lamps with a minimal amount of ancillary circuitry. Most of the required circuitry is situated within an integrated circuit, which includes a full wave rectifier, transient protection, a current control transistor, a feedback control loop, and overheating protection. The integrated circuit powers a transistor circuit structured as a constant current source to energize individual groupings of LEDs, as well as larger configurations of LEDs. The invention is useful for various lighting arrangements such as luminaires, bollards, strip lights, task lights, lighting tubes, and other types of applications that use a multitude of LEDs powered directly by AC line voltage without the requirement of a direct current power supply. This invention may further be used with an external phase switching dimmer apparatus.

Abstract: The present disclosure relates to an apparatus for simplification of input signal configured to simplify a process of microprocessor and to enhance a speed by transforming six input modes of 1-phase/2-input/1-multiplication mode, 1-phase/2-input/2-multiplication mode, CW/CCW mode, 2-phase/1-multiplication mode, 2-phase/2-multiplication mode and 2-phase/4-multiplication mode to a same shape according to types of encoder connected to a PLC high speed counter, and transmitting to the microprocessor, and by adding the six types of input modes to a logic gate circuit of a high speed counter input circuit.

Abstract: An LED dimmer circuit to sequentially control multiple banks of LEDs connected in series. The invention is designed to respond to demands for more or less illumination by sequentially turning on or off one or more banks of LEDs. Each bank is turned off or on in response to the phase angle of an AC power source with each LED bank being controlled by a different phase angle.