公开(公告)号：EP4432537A1

公开(公告)日：2024-09-18

申请号：EP23161480.1

申请日：2023-03-13

申请人： Hitachi Energy Ltd

发明人： Asoodar, Mohsen

IPC分类号： H02M1/34

CPC分类号： H02M1/348 ,  H02M1/344 ,  H02M1/088

摘要： An apparatus (100) is provided, comprising a plurality of interconnected switching devices (1, 2) at least two of which are connected in series so as to form at least one series-connection of switching devices, and a plurality of switching device voltage balancing circuits, VBCs, (3, 4) each of which corresponds to and is connected to a respective switching device (1, 2) of the at least one series-connection of switching devices (1, 2), for limiting the maximum voltage that each switching device (1, 2) of the at least one series-connection of switching devices (1, 2) is subjected to. Each of the plurality of switching device VBCs (3, 4) comprises an electrical energy storage, EES, module (6, 7), and a resistive current path (8, 9) comprising at least one resistor (10, 11), and at least one EES module voltage regulating circuitry, VRC, (12, 13) connected or connectable to the EES module (6, 7), wherein the at least one EES module VRC (12, 13) is configured such that it conducts current therethrough in a direction towards the at least one resistor (10, 11) when the voltage over the at least one EES module VRC (12, 13) is within a predefined threshold voltage range.

公开(公告)号：EP4432538A1

公开(公告)日：2024-09-18

申请号：EP23161481.9

申请日：2023-03-13

申请人： Hitachi Energy Ltd

发明人： Asoodar, Mohsen

IPC分类号： H02M1/34

CPC分类号： H02M1/344

摘要： An apparatus (100) is disclosed, comprising a plurality of interconnected switching devices (1, 2), at least two of which are connected in series so as to form at least one series-connection of switching devices (1, 2; 18, 19), and a plurality of switching device voltage balancing circuits, VBCs, (3, 4) for balancing of voltages over the switching devices of the at least one series-connection of switching devices during and after switching the switching devices from a first operational state to a second operational state. Each of the plurality of switching device VBCs (3, 4) comprises an electrical energy storage, EES, module (6, 7) which can be controllably charged or discharged. Each of the plurality of switching device VBCs (3, 4) corresponds to a respective switching device (1, 2) of the at least one series-connection of switching devices (1, 2). For each series-connection of switching devices, timing of switching the switching devices (1, 2) of the series-connection of switching devices between the operational states in relation to each other and/or timing of charging and/or discharging the EES modules (6, 7) of the respective ones of the switching device VBCs (3, 4) corresponding to the switching devices (1, 2) of the series connection of switching devices is/are controlled based on one or more values indicative of the voltage of each of the EES modules (6, 7) such that any differences between the voltages of the EES modules (6, 7) are decreased.

公开(公告)号：EP4387076A1

公开(公告)日：2024-06-19

申请号：EP23216142.2

申请日：2023-12-13

申请人： Transportation IP Holdings, LLC

发明人： Vudugula, Sai ,  Chittimalla, Rajendra ,  Worden, Bret ,  Ratadiya, Sarit ,  Lovercheck, Glenn ,  Verma, Rajeev ,  Kumar, Ajith ,  Nikolov, Emil

IPC分类号： H02M7/5387 ,  H02M1/14 ,  H02H9/04 ,  H02M1/15 ,  H02M1/34

CPC分类号： H02M7/5387 ,  H02M1/34 ,  H02M1/344 ,  H02M1/14 ,  H02M1/15 ,  H02H9/04

摘要： A power control system may include a snubber assembly conductively coupled with power sources and loads between the power sources and loads. A clipper assembly is conductively coupled with the power sources and loads between the power sources and loads. A controller can activate the clipper assembly responsive to detection of a voltage transient conducted from the one or more power sources. The controller can activate the clipper assembly to dissipate at least part of the voltage transient and to direct a remainder of the voltage transient to a ground reference responsive to the voltage transient exceeding a designated threshold. The snubber assembly may dissipate at least part of the voltage transient and direct a remainder of the voltage transient to the ground reference responsive to the voltage transient not exceeding the designated threshold.