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公开(公告)号：EP4496200A1
公开(公告)日：2025-01-22
申请号：EP23186470.3
申请日：2023-07-19
Applicant: ABB E-mobility B.V.
Inventor： HUBER, Jonas , KOLAR, Johann Walter , DROFENIK, Uwe , CANALES, Francisco
Abstract: A converter (100) for transferring power from a medium voltage side (MV) to a low voltage side (LV) or vice-versa is provided. The converter comprises an AC/DC converter stage (CS) configured to be connected to a three-phase medium-voltage AC power source (va, vb, vc) at the medium voltage side, the AC/DC converter stage (CS) having three AC input terminals (A, B, C) for the respective AC phases of the medium-voltage AC power source (va, vb, vc), and having a positive voltage output (P) and a negative voltage output (N); a DC link (DCL) comprising at least one first DC/DC converter (OC1, OC2) and at least one second DC/DC converter (OC3, OC4), wherein input sides of the at least one first and second DC/DC converters (OC1, OC2, OC3, OC4) are connected in series between the positive output (P) and the negative output (N) of the AC/DC converter stage (CS), with a midpoint (M) between the at least one first DC/DC converter (OC1, OC2) and the at least one second DC/DC converter (OC3, OC4); three switchable branches (BR1, BR2, BR3), each of the switchable branches (BR1, BR2, BR3) comprising, in a series connection between a respective one of the three AC input terminals (A, B, C) and a common star point (S), an inductor (LA, LB, LC) and at least one full-bridge circuit (FA1...FAj; FB1...FBj; FC1...FCj), wherein the star point (S) is directly connected to the midpoint (M) of the DC link (DCL); and a controller (CTL) configured to control the first and second DC/DC converters (OC1, OC2, OC3, OC4) and the full-bridge circuits (FA1...FAj; FB1...FBj; FC1...FCj) such that, when the switchable branch (BR1, BR2, BR3) that, at the point in time of performing the control, has the highest phase voltage among the three AC phases is referred to as the high branch, the switchable branch (FA1...FAj; FB1...FBj; FC1...FCj) that, at the point in time of performing the control, has the lowest phase voltage among the three AC phases is referred to as the low branch and the remaining switchable branch (FA1...FAj; FB1...FBj; FC1...FCj) is referred to as the mid branch, the at least one full-bridge circuit (FB1...FBj) of the mid branch (BR2) and the at least one full-bridge circuit (FA1...FAj; FC1...FCj) of either the high branch (BR1) or the low branch (BR3) are operated to impress a desired mid-branch current (i_midm) and the at least one full-bridge circuit (FA1...FAj; FC1...FCj) in the other one of the high branch (BR1) and the low branch (BR3) is turned off.
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公开(公告)号：EP4496199A1
公开(公告)日：2025-01-22
申请号：EP23186463.8
申请日：2023-07-19
Applicant: ABB E-mobility B.V.
Inventor： HUBER, Jonas , KOLAR, Johann Walter , DROFENIK, Uwe , CANALES, Francisco
Abstract: A converter (100, 200) for transferring power from a medium voltage side (MV) to a low voltage side (LV) or vice-versa is provided. The converter (100, 200) comprises an AC/DC converter stage (CS) configured to be connected to a three-phase medium-voltage AC power source (va, vb, vc) at the medium voltage side, the AC/DC converter stage (CS) having three AC input terminals (A, B, C) for the respective AC phases of the medium-voltage AC power source (va, vb, vc), and having a positive voltage output (P) and a negative voltage output (N); a DC link (DCL) comprising at least one first DC/DC converter and at least one second DC/DC converter, wherein input sides of the at least one first and second DC/DC converters (OC1, OC2, OC3, OC4) are connected in series between the positive output (P) and the negative output (N) of the AC/DC converter stage (CS), with a midpoint (M) between the at least one first DC/DC converter (OC1, OC2) and the at least one second DC/DC converter (OC3, OC4); wherein output sides of the at least one first and second DC/DC converters (OC 1, OC2, OC3, OC4) are connected in parallel to provide a low voltage (V out ) to low-voltage output terminals on the low voltage side; three switchable branches (BR1, BR2, BR3), each of the switchable branches (BR1, BR2, BR3) comprising a bi-directional switch circuit between a respective one of the three AC input terminals (A, B, C) and a common star point (S); a regulating circuit comprising either at least one voltage-source-type full-bridge circuit (CL1, CL2) including a DC/DC stage, in particular a DC/DC converter including an isolation transformer, the at least one voltage-source-type full-bridge circuit (CL1, CL2) connected, on its input side, between the star point (S) and the midpoint (M) and, on its output side, to the low-voltage output terminals; or at least one first full-bridge circuit between cathode connections of a diode bridge in the AC/DC converter stage and the positive output (P), and at least one second full-bridge circuit connected between anode connections of the diode bridge and the negative output (N); and a controller configured to control the first and second DC/DC converters, the bi-directional switch circuits, and the regulating circuit such that a current (i pm ) between the positive voltage output (P) and the midpoint (M) essentially equals a maximum phase current (i max ) of the phase in which the phase voltage at the point in time of performing the control is the highest among the three AC phases, and such that a current (i mn ) between the midpoint (M) and the negative voltage output (N) essentially equals a minimum phase current (i min ) of the phase in which the phase voltage at the point in time of performing the control is the lowest among the three AC phases.
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3.发明公开
公开(公告)号：EP4489285A1
公开(公告)日：2025-01-08
申请号：EP23183646.1
申请日：2023-07-05
Applicant: ABB E-mobility B.V.
Inventor： DROFENIK, Uwe , CANALES, Francisco , HUBER, Jonas , KOLAR, Johann Walter
Abstract: A converter including at least one DC/AC stage configured for generating a medium frequency AC power and having first and second AC outputs for the medium frequency AC power, at least one AC/DC stage configured for generating a DC power from the medium frequency AC power and having first and second AC inputs for the medium frequency AC power, and a resonant circuit provided between the DC/AC stage and the AC/DC stage and configured for transferring the medium frequency AC power. The resonant circuit includes at least two capacitors including a first capacitor and a second capacitor. The first capacitor is connected between the first AC output and the first AC input, and the second capacitor is connected between the second AC output and the second AC input. The resonant circuit further includes at least two inductors including a first inductor and a second inductor connected in series and defining a connection point between the two inductors. In a first alternative, the first inductor is connected in series between the first capacitor and the first AC input, and the second inductor is connected in series between the first AC input and the second AC input. In a second alternative, the first inductor is connected in series between the first capacitor and the first AC output, and the second inductor is connected in series between the first AC output and the second AC output. The at least two capacitors provide galvanic insulation between the DC/AC stage and the AC/DC stage.
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