Abstract: An electrical supply system, suitable for supplying a plurality of separate loads from one AC source, including at least two single-phase or multi-phase electrical transformers, each including one primary induction circuit and one secondary induction circuit. The primary induction circuits are connected in series forming a succession of transformers. For each of the transformers, the secondary induction circuit includes at least two groups of secondary windings, each group of secondary windings having at least one group of output terminals. One of the groups of output terminals is connected to at least one of the loads to be supplied, and another of the groups of output terminals is connected to one of the groups of output terminals of another transformer in the succession of transformers, so as to achieve a parallel connection of the secondary induction circuits.

Abstract: The invention relates to a system for supplying direct electric power to at least two loads from an alternating electric power source comprises a circulation bus for the alternating power adapted to be connected to the alternating power source and at least one converter for converting alternating power into direct power, connected to the circulation bus. The system further comprises at least two connection interfaces, each connection interface being connected to a corresponding converter and being adapted to be connected to at least one electric load to supply direct electric power for the or each corresponding load; and means for controlling the connection interfaces, the control means being capable of time-shifting the start-up moment for the supply of direct power from one interface to the other.

Abstract: The electric conversion stage according to the invention can be connected on one hand to intermediate terminals of a DC voltage electric bus, and on the other hand to output terminals. It comprises P switching branches, P?2, the switching branches being connected in parallel between the intermediate terminals, each switching branch including first and second controllable electronic switches connected serially and connected to each other by a midpoint, each switch including a semiconductor switching element and a diode connected in anti-parallel to the semiconductor element, and means for controlling the electronic switches according to a control law.

Abstract: The invention relates to a system for supplying direct electric power to at least two loads from an alternating electric power source comprises a circulation bus for the alternating power adapted to be connected to the alternating power source and at least one converter for converting alternating power into direct power, connected to the circulation bus. The system further comprises at least two connection interfaces, each connection interface being connected to a corresponding converter and being adapted to be connected to at least one electric load to supply direct electric power for the or each corresponding load; and means for controlling the connection interfaces, the control means being capable of time-shifting the start-up moment for the supply of direct power from one interface to the other.

Abstract: The electric conversion stage according to the invention can be connected on one hand to intermediate terminals of a DC voltage electric bus, and on the other hand to output terminals. It comprises P switching branches, P?2, the switching branches being connected in parallel between the intermediate terminals, each switching branch including first and second controllable electronic switches connected serially and connected to each other by a midpoint, each switch including a semiconductor switching element and a diode connected in anti-parallel to the semiconductor element, and means for controlling the electronic switches according to a control law.

Abstract: A circuit that electrically controls power includes at least one power control device and at least one heat extraction device. The at least one extraction device is in thermal contact with the at least one power control device. The heat extraction device is arranged such that it can be clamped to a fixed predefined electric potential and electrically insulated by the at least one power control device.

Abstract: A power supply system for railway traction applications including a multilevel AC/DC converter. The converter comprises a plurality of series-connected single-stage cycloconverters or direct AC frequency converters connected between an AC supply line and a traction transformer. The transformer is operable at a transformer nominal frequency below 3 kHz and above the AC line frequency. On the secondary side of the transformer, more than one parallel-connected secondary converter are provided and connected to a DC link. In case of failure of one of the secondary converters, the multilevel AC/DC converter may continue to operate with reduced power delivered by the remaining operating levels.

Abstract: A power loop has a power-loop emitter and a power-loop receptor located in different housings and connected via a power-loop conductor that is at least partially exterior to both housings. By means of a current transformer inductively coupling the conductor to the emitter or receptor, the power-loop also provides for electrical insulation between the emitter and the receptor. The emitter and receptor being distant from each other offers greater flexibility in the positioning and design of the galvanic separation between the emitter and the receptor or the supplied gate-drive, respectively. For example, the local voltages of converter levels ranging up to the supply voltage of e.g. 21 kV RMS of the multilevel converter can thus be insulated from the global earth potential of the power-loop emitter. Several power-loop receptors can be coupled to the same power-loop conductor to be fed by the same power-loop emitter.

Abstract: The disclosure relates to a circuit arrangement for electrically controlling power, comprising at least one power control device and at least one heat extraction device. The at least one extraction device is in thermal contact with the at least one power control device. The heat extraction device is arranged such that it can be clamped to a fixed predefined electric potential and electrically insulated by the at least one power control device.

Abstract: The document specifies a method for fault handling in a converter circuit for switching three voltage levels, in which the converter circuit has a converter subsystem provided for each phase (R,S,T), in which a top fault current path (A) or a bottom fault current path (B) in the converter subsystem is detected, the top fault current path (A) running through the first, second, third and sixth power semiconductor switches in the converter subsystem or through the first and fifth power semiconductor switches (S1, S5) in the converter subsystem, and the bottom fault current path (B) running through the second, third, fourth and fifth power semiconductor switches in the converter subsystem or through the fourth and sixth power semiconductor switches in the converter subsystem, and in which the power semiconductor switches are switched on the basis of a fault switching sequence.

Abstract: A converter circuit is disclosed for switching of a multiplicity of switching voltage levels, which have n first switching groups for each phase (R, S, T), with the n-th first switching group being formed by a first drivable bidirectional power semiconductor switch and a second drivable bidirectional power semiconductor switch, and with the first switching group to the (n?1)-th switching group each being formed by a first drivable bidirectional power semiconductor switch and a second drivable bidirectional power semiconductor switch, and by a capacitor which is connected to the first and second drivable bidirectional power semiconductor switches with each of the n first switching groups being connected in a linked form to the respectively adjacent first switching group, and with the first and the second drivable bidirectional power semiconductor switches in the first switching group being connected to one another.

Abstract: The document specifies a method for fault handling in a converter circuit for switching three voltage levels, in which the converter circuit has a converter subsystem provided for each phase (R,S,T), in which a top fault current path (A) or a bottom fault current path (B) in the converter subsystem is detected, the top fault current path (A) running through the first, second, third and sixth power semiconductor switches in the converter subsystem or through the first and fifth power semiconductor switches (S1, S5) in the converter subsystem, and the bottom fault current path (B) running through the second, third, fourth and fifth power semiconductor switches in the converter subsystem or through the fourth and sixth power semiconductor switches in the converter subsystem, and in which the power semiconductor switches are switched on the basis of a fault switching sequence.

Abstract: The present disclosure is concerned with a power supply system for railway traction applications including a multilevel AC/DC converter. The converter comprises a plurality of series-connected single-stage cycloconverters or direct AC frequency converters connected between an AC supply line and a traction transformer. The transformer is operable at a transformer nominal frequency below 3 kHz and above the AC line frequency. On the secondary side of the transformer, more than one parallel-connected secondary converter are provided and connected to a DC link. In case of failure of one of the secondary converters, the multilevel AC/DC converter may continue to operate with reduced power delivered by the remaining operating levels.

Abstract: The present disclosure is concerned with the provision of the necessary power to the gate-drives controlling the semiconductor devices of a multilevel converter used in railway traction applications. A power loop with a power-loop emitter and a power-loop receptor located in different housings and connected via a power-loop conductor that is at least partially exterior to both housings is proposed. By means of a current transformer inductively coupling the conductor to the emitter or receptor, the power-loop also provides for electrical insulation between the emitter and the receptor. The fact that emitter and receptor are distant from each other offers greater flexibility in the positioning and design of the galvanic separation between the emitter and the receptor or the supplied gate-drive, respectively. In particular, the local voltages of converter levels ranging up to the supply voltage of e.g.

Abstract: A signal transmission system is used to drive at least one power semiconductor switch (S1, S2, . . . , Sn) from a controller (11). The controller (11) can transmit at least one control signal to at least one modulator (M1, M2, . . . , Mn) using at least one first transmission path (3). Each power semiconductor switch (S1, S2, . . . , Sn) is connected to a respective control electrode driver stage (G1, G2, . . . , Gn) and the at least one modulator (M1, M2, . . . , Mn) can transmit at least one drive signal to each of the control electrode driver stages (G1, G2, . . . , Gn) using a respective second transmission path (4). At least one control signal and/or a drive signal can be transmitted using electromagnetic radiation and the associated transmission path (3, 4) is wireless.

Abstract: A method for assembling a power semiconductor module with reduced partial discharge behavior is described. The method comprises the steps of bonding an insulating substrate (2) onto a bottom plate (11); disposing a first conductive layer (4) on a portion of said insulating substrate (2), so that at least one peripheral top region of said insulating substrate (2) remains uncovered by the first conductive layer (4); bonding a semiconductor chip (6) onto said first conductive layer (4); disposing a precursor (51) of a first insulating material (5) in a first corner (24) formed by said first conductive layer (4) and said peripheral region of said insulating substrate (2); polymerizing the precursor (51) of the first insulating material (5) to form the first insulating material (5): and covering said semiconductor chip (6), said substrate (2), said first conductive layer (4), and said first insulating material (5) at least partially with a second insulating material.

Abstract: A converter circuit is specified for switching a large number of switching voltage levels, which has n first switching groups for each phase, with the n-th first switching group being formed by a first power semiconductor switch and a second power semiconductor switch, and with the first first switching group to the-th switching group each being formed by a first power semiconductor switch and a second power semiconductor switch and by a capacitor, which is connected to the first and second power semiconductor switches, with each of the n first switching groups being connected in series to the respectively adjacent first switching group, and with the first and the second power semiconductor switches in the first first switching group being connected to one another.

Abstract: A converter circuit is specified for switching of a multiplicity of switching voltage levels, which have n first switching groups (1.1, . . . , 1.n) for each phase (R, S, T), with the n-th first switching group (1.n) being formed by a first drivable bidirectional power semiconductor switch (2) and a second drivable bidirectional power semiconductor switch (3), and with the first first switching group (1.1) to the (n?1)-th switching group (1.(n?1)) each being formed by a first drivable bidirectional power semiconductor switch (2) and a second drivable bidirectional power semiconductor switch (3), and by a capacitor (4) which is connected to the first and second drivable bidirectional power semiconductor switches (2, 3) with each of the n first switching groups (1.1, . . . , 1.n) being connected in a linked form to the respectively adjacent first switching group (1.1, . . . , 1.n), and with the first and the second drivable bidirectional power semiconductor switches (2, 3) in the first first switching group (1.

Abstract: A method for assembling a power semiconductor module with reduced partial discharge behavior is described. The method includes steps of bonding an insulating substrate onto a bottom plate; disposing a first conductive layer on a portion of said insulating substrate, so that at least one peripheral top region of said insulating substrate remains uncovered by the first conductive layer; bonding a semiconductor chip onto said first conductive layer; disposing a precursor of a first insulating material in a first corner formed by the first conductive layer and the peripheral region of the insulating substrate; polymerizing the precursor of the first insulating material to form the first insulating material; and covering the semiconductor chip, said substrate, the first conductive layer, and the first insulating material at least partially with a second insulating material. The precursor of the first insulating material can be a low viscosity monomer or oligomer, preferably a polyimide.

Abstract: The power module housing comprises two electrically insulating housing elements (1, 2) that are attached to each other. A first of said housing elements (2) comprises at least two openings (24) for electric power terminals (31, 32) and a slot-like recess (23). Between the openings (24) three insulating walls (11, 21, 22) are arranged on and perpendicular to a surface of the housing. One insulating wall (11) is part of a second of said housing elements (1) and is inserted into the recess (23) in said first housing element (2), while an at least one second of said insulating walls (21, 22) is part of the first housing element (2). The insulating walls between the openings for the power terminals allow a compact arrangement of the terminals.