Abstract:
The present disclosure relates to a submodule (3) for a chain link converter leg (2). The submodule comprises a first semiconductor structure (4a) forming first current path through the submodule, and a second semiconductor structure (4b), connected in parallel to the first semiconductor structure (4a), forming a second current path through the submodule. At least the first semiconductor structure (4a) comprises a DC capacitor (5), and at least the second semiconductor structure (4b) comprises a reverse-blocking arrangement (8). The submodule is configured for, when in a bypass mode, allow current to pass through the reverse-blocking arrangement.
Abstract:
The present disclosure relates to a multilevel electrical converter comprising a plurality of chain-linked cells (1). Each cell comprises a primary capacitive storage element (C 1 ) and a secondary capacitive storage element (C 2 ), connected in parallel with the primary capacitive storage element. The secondary capacitive storage element is connected in the cell via at least first and second series connected semiconductor switches (3a) and (3b) connected in parallel with the primary capacitive storage element. The first series connected semiconductor switch (3a) is connected in series with the secondary capacitive storage element and the second series connected semiconductor switch (3b) is connected in parallel with the secondary capacitive storage element. The series connected semiconductor switches are configured for high frequency switching of at least ten times the fundamental frequency of the converter.
Abstract:
The invention relates to the field of charging system (10), particularly for electric vehicles and/or for a charging box (60) for the electric vehicles. The charging system (10) comprises a line interphase transformer, LIT-based rectifier (30), configured for connecting an input (31) of the LIT-based rectifier (30) to an AC medium-voltage power signal (11) and for outputting a medium-voltage DC-signal (39); a modular DC/DC converter with large step-down gain (40), configured for transforming the medium- voltage DC-signal (39) into a medium-voltage HF-AC-signal (49); and a medium- frequency transformer, MFT (50), configured for transforming the medium-voltage HF-AC-signal (49) into a low-voltage HF-AC-signal (59) for the at least one charging box (60).
Abstract:
A bidirectional DC-DC converter (1) with intermediate conversion into AC power includes: a DC-AC conversion circuit (10) using a plurality of MOSFETs (Q11-Q14); and an AC-DC conversion circuit (11) using a plurality of power diodes (D11-D14); a transformer (T) magnetically coupling a first winding (W1) and a second winding (W2), wherein the first winding (W1) being electrically connected between the DC-AC conversion circuit (10) AC terminals (10ac) and being electrically connected between the AC-DC conversion circuit (11) AC terminals (11ac) in an arrangement such that the AC power generated from the intermediate conversion by an operation of the DC-AC conversion circuit (10) is transferred by the transformer (T) in a forward direction from the first winding (W1) to the second winding (W2), and the AC-DC conversion circuit (11) converts the AC power transferred in a backward direction from the second winding (W2) to the first winding (W1) into DC power; a pair of switches (Qa1, Qb1), one of which being inserted in series between respective DC terminals of the DC-AC conversion circuit (10) and the AC-DC conversion circuit (11) and the other of which being inserted in series between another respective DC terminals of the DC-AC conversion circuit (10) and the AC-DC conversion circuit (11); and a controller (12) being adapted for turning on the pair of switches (Qa1, Qb1) such that the plurality of power diodes (D11-D14) of the AC-DC conversion circuit (11) are reverse-biased where the AC power is transferred in the forward direction and turning off the pair of switches (Qa1, Qb1) where the AC power is transferred in the backward direction.
Abstract:
A DC/DC converter comprises a first DC link, preferably a first DC link capacitor; a first plurality of N>1 converter bridges connected in parallel to the first DC link; and a transformer, preferably a medium frequency transformer, having a primary side and a secondary side; wherein the primary side comprising at least one primary winding. In accordance with the invention, the converter further comprises a first plurality of N impedance elements, wherein for each converter bridge, a different one from the first plurality of impedance elements is connected between said converter bridge and the at least one primary winding.
Abstract:
A charging station (10) for electric vehicles (38) comprises a central part (12) for converting a grid AC voltage from an electrical grid (18) into a high frequency AC voltage; a distribution network (16) for distributing the high frequency AC voltage; and a plurality of coils (26, 36) directly connected to the distribution network (16), wherein each coil (26, 36) is adapted for transferring energy to an electrical vehicle (38).
Abstract:
A power module (10) comprises a plurality of normally-on semiconductor switches (14) based on a wide bandgap substrate, the normally-on semiconductor switches (14) connected in parallel; and a balancing unit (24) comprising a capacitor (32) and a balancing semiconductor switch (34) connected in series, which are connected in parallel to the normally-on semiconductor switches (14).
Abstract:
The invention relates to a power supply system (10), particularly for a bidirectional energy flow between a medium-voltage grid (11) and a low-voltage electricity consumer site (60). The system (10) comprises a power feeding system (25), configured for transforming an AC medium-voltage power signal from the medium-voltage grid (11) into a low-voltage power signal (29) for feeding the electricity consumer site (60). Furthermore, it comprises a low-voltage multiphase converter (40), configured for transforming a low-voltage signal (41, 42) into a low-voltage multiphase signal (49), wherein the multiphase converter (40) is arranged antiparallel to the power feeding system (25); and an LV/MV multiphase transformer (50), configured for transforming the low-voltage multiphase signal (49) into an output-signal (59) that is conformant to the AC medium-voltage power signal (11).
Abstract:
The present invention is concerned with a four-level voltage source converter topology having two intermediate converter branches connecting two intermediate voltage levels to a load terminal, and having a interconnect switch coupling the two intermediate branches. The interconnect switch replaces two controlled switches present in corresponding four-level prior art topologies. The four-level converter thus requires, for a full bidirectional implementation, only five active switches. The reduced number of active switches/gate drivers and the four available output voltage levels make this solution interesting for lower cost power electronics with improved reliability, good power quality and minimized filtering requirement.
Abstract:
An uninterruptible power supply system includes an AC input interface and a DC output interface, and a plurality of power supply paths coupled between the AC and DC interfaces. A first one of the power supply paths has a lower component count, whereas a second one of the power supply paths has a higher component count. At least one of the power supply paths is structured to supply DC electrical power to a power bus in the DC output interface at a varying voltage.