A semiconductor module, including: plurality of output elements provided to constitute an upper arm and a lower arm; a resin case provided surrounding an accommodation space for accommodating the output elements; an arm-to-arm wiring line for connecting the upper arm with the lower arm; an output terminal, which is connected to the arm-to-arm wiring line and is for outputting output currents from the output elements to a load being external to the semiconductor module; a sense terminal, which is connected to the arm-to-arm wiring line and is for detecting currents that flow in the output elements; and an inductor provided between a connection point for connecting the arm-to-arm wiring line with the output terminal, and the output terminal is provided. An inductance of the inductor is 1 μH or more.

A voltage source converter, for interconnecting electrical networks, comprises a converter structure which includes a terminal for connection to the first electrical network and a terminal for connection to the second electrical network. The converter structure also includes at least one module that is connected between the terminals. The module includes at least one energy storage device and at least one switching element. The energy storage element and switching element are operable to selectively provide a voltage source. The converter structure still further includes an integrated passive fault current limiter that is configured to present a first impedance to a normal current flowing in the voltage source converter during normal operation of the voltage source converter, and is configured to present a second impedance to a fault current flowing in the voltage source converter during a fault condition. The first impedance is lower than the second impedance.

Circuit arrangement 1 for securely switching inverter devices 2 of a system by a common emergency switch 3 which is connected to a switching signal input 4 of one of the inverter devices 2 which is configured as a master of the system and comprises a switching signal output 5, other inverter devices 2 of the system configured as a slave being connected to the one inverter device via switching signal lines 6, wherein the inverter devices 2 configured as a slave together with the inverter device 2 configured as a master form a switching chain which is automatically switched upon actuation of the emergency switch 3.

Circuit arrangement 1 for securely switching inverter devices 2 of a system by a common emergency switch 3 which is connected to a switching signal input 4 of one of the inverter devices 2 which is configured as a master of the system and comprises a switching signal output 5, other inverter devices 2 of the system configured as a slave being connected to the one inverter device via switching signal lines 6, wherein the inverter devices 2 configured as a slave together with the inverter device 2 configured as a master form a switching chain which is automatically switched upon actuation of the emergency switch 3.

A control device for an MMC is disclosed. The control device for an MMC including a plurality of converter arms that include a plurality of sub-modules connected in series and that are connected to a DC link includes: an arm controller, which detects the arm current of a converter arm so as to determine whether a DC failure has occurred, and, if it is determined that the DC failure has occurred, transmits a bypass control signal for protecting a sub-module and notifies of the DC failure; a sub-module controller for controlling the sub-module so as to bypass a DC failure current according to the bypass control signal received from the arm controller; and a main controller, which detects, in real-time, the arm current of the converter arm and a voltage (DC link voltage) of the DC link, determines whether the DC failure is a temporary DC failure or a permanent DC failure on the basis of the detected arm current and DC link voltage if the occurrence of the DC failure is notified by the arm controller, and transmits, to the arm controller, a normal operation control signal for normal operation of the sub-module or a bypass control signal for bypassing of the DC failure current.

A semiconductor module, including: plurality of output elements provided to constitute an upper arm and a lower arm; a resin case provided surrounding an accommodation space for accommodating the output elements; an arm-to-arm wiring line for connecting the upper arm with the lower arm; an output terminal, which is connected to the arm-to-arm wiring line and is for outputting output currents from the output elements to a load being external to the semiconductor module; a sense terminal, which is connected to the arm-to-arm wiring line and is for detecting currents that flow in the output elements; and an inductor provided between a connection point for connecting the arm-to-arm wiring line with the output terminal, and the output terminal is provided. An inductance of the inductor is 1 H or more.

A power supply device includes a first inverter that converts a first direct-current voltage into a first alternating-current voltage and outputs the first alternating-current voltage, and a second inverter that has an output connected in series with an output of the first inverter and converts a second direct-current voltage into a second alternating-current voltage synchronized with the first alternating-current voltage and outputs the second alternating-current voltage.

A power supply circuit comprises control signal circuitry comprising power control command generation means for receiving or generating a power supply command and for generating internal switching control signals according to the power supply command for controlling power supply, and a first galvanic separation stage receiving at its input the internal switching control signals and producing at its separation output output control signals. It also comprises power control circuitry with power input terminals connectable to an input power supply, a signal input connected to said separation output, a semiconductor power switch for switching on and off power drawn from said power input terminals in accordance with the output control signal from said signal input, a first transformer comprising a first primary winding connected to said semiconductor power switch and to one of said power input terminals and a first secondary winding inductively coupled with said first primary winding, and a power output circuit connected to said first secondary winding and having power output terminals for supplying controlled supply power.