Abstract: The present disclosure relates to an overcurrent protection inverter, and more particularly, to an inverter, which uses a leg-shunt resistor so as to detect an instantaneous maximum output current and an AD current, thereby performing an inverter protection operation. The present disclosure detects the instantaneous maximum output current and detects the AD current from the leg-shunt resistor so as to perform an overcurrent protection operation when an overcurrent occurs in the entire inverter operation section, thereby enabling protection of the inverter.

Abstract: The present disclosure relates to an interface circuit of a motor driving apparatus, the interface circuit comprising a power circuit unit for controlling driving of a motor, and a control panel unit which controls the power circuit unit and provides a user interface, wherein the power circuit unit further comprises a second MCU which controls a relay and an additional device unit and detects an operation state of the additional device unit, and the second MCU can communicate with a first MCU of the control panel unit via a communication line.

Abstract: The present disclosure relates to a reinforced insulation transformer and a design method thereof. The reinforced insulation transformer according to an embodiment of the present disclosure is a transformer in which a secondary winding is wound on a primary winding so that the primary winding and the secondary winding have a stacked structure and satisfy a reinforced insulation criterion, wherein each of the primary winding and the secondary winding includes a conducting wire and an insulation outer layer that surrounds the conducting wire, and the insulation outer layer of the secondary winding has more layers or a greater thickness than the insulation outer layer of the primary winding.

Abstract: The present closure provides a switching mode power supply including a primary circuit unit comprising an input circuit proving an input voltage and a semiconductor switch conducting or cutting off the input circuit, a transformer comprising a primary winding connected to the primary circuit unit and a plurality of secondary windings magnetically connected to the primary winding, a plurality of secondary circuit units respectively connected to the secondary windings and supplying a plurality of output voltages, a feedback circuit unit receiving one of the output voltages as feedback and calculating a compensation voltage for constantly controlling the output voltages, a control unit controlling on/off a duty ratio of the semiconductor switch according to the compensation voltage, and a protection circuit unit receiving one of the output voltages to determine whether the feedback circuit unit fails and to cut off, when the feedback circuit fails, power of the control unit.

Abstract: The present disclosure relates to an overcurrent protection inverter, and more particularly, to an inverter, which uses a leg-shunt resistor so as to detect an instantaneous maximum output current and an AD current, thereby performing an inverter protection operation. The present disclosure detects the instantaneous maximum output current and detects the AD current from the leg-shunt resistor so as to perform an overcurrent protection operation when an overcurrent occurs in the entire inverter operation section, thereby enabling protection of the inverter.

Abstract: The present disclosure relates to an inverter system capable of detecting an output ground fault and an output ground fault detection method using same and, particularly, to an inverter for detecting an output ground fault by detecting the current of a leg-shunt resistor, and an inverter output ground detection fault method using same. The present disclosure compares absolute peak values of 3-phase current AD raw values detected from a shunt resistor, and thus may reliably detect the output ground fault of an inverter.

Abstract: The present disclosure relates to a device for driving a motor, including a lower case having an accommodating space formed therein and an open upper side; an upper case closing an open surface of the lower case to form an inner space; a central case disposed in the lower case to partition an inner space formed by the lower case and the upper case; a first board disposed on the lower case and comprising a first connector; a second board disposed on the central case and comprising a second connector; and a connection board disposed in the inner space and comprising a first connection connector electrically connected to the first connector and a second connection connector electrically connected to the second connector to transmit electric signals between the board.

Abstract: The present disclosure relates to an interface circuit of a motor driving apparatus, the interface circuit comprising a power circuit unit for controlling driving of a motor, and a control panel unit which controls the power circuit unit and provides a user interface, wherein the power circuit unit further comprises a second MCU which controls a relay and an additional device unit and detects an operation state of the additional device unit, and the second MCU can communicate with a first MCU of the control panel unit via a communication line.

Abstract: A diagnosing device of a three phase inverter is provided, which includes a relay connected in series with a capacitor disposed on a DC link, an initial charging resistor connected in parallel to the relay, an inverter comprising a switching device for controlling a power supply to three phase output lines, a current sensor disposed on a connection line connecting between the DC link and the inverter to sense a current, and a control unit for driving the switching device and diagnosing at least one of opening and shorting of the switching device according to whether the current is sensed or not.

Abstract: A diagnosing device of a three phase inverter is provided, which includes a relay connected in series with a capacitor disposed on a DC link, an initial charging resistor connected in parallel to the relay, an inverter comprising a switching device for controlling a power supply to three phase output lines, a current sensor disposed on a connection line connecting between the DC link and the inverter to sense a current, and a control unit for driving the switching device and diagnosing at least one of opening and shorting of the switching device according to whether the current is sensed or not.

Abstract: Disclosed is a device for detecting a phase loss in an output current in an inverter. The device includes: an output current detection unit for detecting two phases output currents from two signals output from two shunt-resistors connected to two phases legs respectively; an output current calculation unit for calculating an output current of one remaining phase using the detected two phases output currents; and an output phase loss detection unit configured for detecting an output phase loss when the calculated output current is within a current band corresponding to the output phase loss or when the calculated output current has a magnitude equal to and a sign opposite to one of the detected two phases output currents.

Abstract: A diagnosing device of a three phase inverter is provided, which includes a relay connected in series with a capacitor disposed on a DC link, an initial charging resistor connected in parallel to the relay, an inverter comprising a switching device for controlling a power supply to three phase output lines, a current sensor disposed on a connection line connecting between the DC link and the inverter to sense a current, and a control unit for driving the switching device and diagnosing at least one of opening and shorting of the switching device according to whether the current is sensed or not.

Abstract: The present disclosure relates to a reinforced insulation transformer and a design method thereof. The reinforced insulation transformer according to an embodiment of the present disclosure is a transformer in which a secondary winding is wound on a primary winding so that the primary winding and the secondary winding have a stacked structure and satisfy a reinforced insulation criterion, wherein each of the primary winding and the secondary winding includes a conducting wire and an insulation outer layer that surrounds the conducting wire, and the insulation outer layer of the secondary winding has more layers or a greater thickness than the insulation outer layer of the primary winding.

Abstract: The present invention relates to a device for driving a motor, the device comprising: a main housing for accommodating a circuit module therein, wherein a top of the main housing is partially opened to define an open portion; an input/output (IO) cover coupled to the main housing so as to occupy the open portion; and an auxiliary housing coupled to the main housing at an vertical side face of the main housing.

Abstract: Disclosed is a device for detecting an instantaneous maximum output current of an inverting module as a peak-current thereof. The inverting module converts a direct current (DC) link voltage to an alternate current (AC) voltage, and includes three-phases legs. Each leg has lower and upper switching elements connected in series. The device includes a shunt resistor serially connected to a lower switching element of each leg of the inverting module; a current detection module configured for detecting an output current from a signal output from each shunt resistor; and a summer configured for receiving and summing the detected output currents from the current detection module and outputting the instantaneous maximum output current of the inverting module as the peak-current thereof.

Abstract: The present invention relates to a method for controlling an inverter to prevent an unnecessary fan trip. The method includes: receiving a fan current; when the fan current is above a high trip level or is below a low trip level, incrementing an error count; when the error count reaches an error count maximum value, incrementing a trip count and initializing the error count; and when the trip count reaches a trip count maximum value, generating a fan trip signal.

Abstract: Disclosed is a method for controlling an inverter. The method includes detecting an output current from an inverter to determine a software over-current suppression (S/W OCS) level according to an output frequency of the output current.

Abstract: A device and method for controlling an inverter is disclosed. The inverter-controlling device in accordance with the present disclosure determines an operation state of a switching element of an initial charging module based on predetermined time durations and a magnitude of a DC link voltage measured at each of time points corresponding to the predetermined time durations.

Abstract: The present disclosure relates to a motor-driving device with an improved structure of a circuit module. According to the present disclosure, the boards are coupled to each other via a connector or a bolt. This removes wires use, and reduces an assembly tolerance, thereby to improve the device productivity.

Abstract: Disclosed is a device for detecting a phase loss in an output current in an inverter. The device includes: an output current detection unit for detecting two phases output currents from two signals output from two shunt-resistors connected to two phases legs respectively; an output current calculation unit for calculating an output current of one remaining phase using the detected two phases output currents; and an output phase loss detection unit configured for detecting an output phase loss when the calculated output current is within a current band corresponding to the output phase loss or when the calculated output current has a magnitude equal to and a sign opposite to one of the detected two phases output currents.