公开(公告)号：US20230283072A1

公开(公告)日：2023-09-07

申请号：US18316275

申请日：2023-05-12

Applicant: SMA Solar Technology AG

Inventor： Alexander Unru ,  Marcel Kratochvil ,  Burkard Müller

IPC: H02J1/14 ,  H02M3/155

CPC classification number: H02J1/14 ,  H02M3/155

Abstract: The application describes a method for balancing voltages on a first and a second DC conductor in a DC grid using a balancing circuit with a first and second semiconductor switch connected in series between the first and second DC conductors, and a connection to a ground potential that is arranged between the first and second semiconductor switches. In the presence of an asymmetry in the voltages of the first and second DC conductors to ground potential, a compensation current is generated between at least one of the DC conductors ground potential via at least one of the semiconductor switches, with the asymmetry in the voltages being reduced by the compensation current (IA), with the voltages of the DC conductors to ground potential being balanced.

公开(公告)号：US20230291303A1

公开(公告)日：2023-09-14

申请号：US18316286

申请日：2023-05-12

Applicant: SMA Solar Technology AG

Inventor： Alexander Unru ,  Marcel Kratochvil ,  Burkard Müller

IPC: H02M1/32 ,  H02M1/00 ,  H02M7/04 ,  H02J1/00

CPC classification number: H02M1/32 ,  H02M1/0009 ,  H02M7/04 ,  H02J1/00

Abstract: A power converter between an AC side and DC of the power converter is disclosed. The AC side is connected to an AC supply grid and the DC side is connected to a DC grid. The power converter includes a bridge circuit connected to the AC side of the power converter via AC switches and connected to the DC side of the power converter via circuit breakers, wherein a DC link circuit of the power converter is chargeable from the AC supply grid via an AC precharging circuit. The power converter has an insulation monitor to measure the insulation resistance of the DC side when the AC precharging circuit is connected to the DC link circuit. The disclosure also includes a related method.

公开(公告)号：US12199440B2

公开(公告)日：2025-01-14

申请号：US17985243

申请日：2022-11-11

Applicant: SMA Solar Technology AG

Inventor： Alexander Unru ,  Burkard Müller

IPC: H02M1/32 ,  H02J3/38 ,  H02M1/00 ,  H02M7/487 ,  H02M7/5387

Abstract: The disclosure relates to an inverter including a first bridge branch with a first phase output, a second bridge branch with a second phase output, a third bridge branch with a third phase output, wherein the phase outputs of the bridge branches can each be connected to a phase conductor of a three-phase power distribution network. The inverter is configured, in a normal operating mode of the three-phase power distribution network and/or of a higher-level power supply network connected thereto, to connect the phase outputs to the relevant phase conductor and, in the event of a fault in the three-phase power distribution network and/or in the higher-level power supply network connected thereto, to disconnect the three-phase power distribution network from the higher-level power supply network via a network disconnector, to disconnect the first phase output from the first phase conductor by means of a switching unit and to connect same to a neutral conductor of the three-phase power distribution network, and to establish a neutral potential for the neutral conductor via the first bridge branch. The disclosure further relates to a method for operating an inverter of this kind.

公开(公告)号：US20230070123A1

公开(公告)日：2023-03-09

申请号：US17985243

申请日：2022-11-11

Applicant: SMA Solar Technology AG

Inventor： Alexander Unru ,  Burkard Müller

IPC: H02J3/38 ,  H02M7/487 ,  H02M7/5387 ,  H02M1/32 ,  H02M1/00

Abstract: The disclosure relates to an inverter including a first bridge branch with a first phase output, a second bridge branch with a second phase output, a third bridge branch with a third phase output, wherein the phase outputs of the bridge branches can each be connected to a phase conductor of a three-phase power distribution network. The inverter is configured, in a normal operating mode of the three-phase power distribution network and/or of a higher-level power supply network connected thereto, to connect the phase outputs to the relevant phase conductor and, in the event of a fault in the three-phase power distribution network and/or in the higher-level power supply network connected thereto, to disconnect the three-phase power distribution network from the higher-level power supply network via a network disconnector, to disconnect the first phase output from the first phase conductor by means of a switching unit and to connect same to a neutral conductor of the three-phase power distribution network, and to establish a neutral potential for the neutral conductor via the first bridge branch. The disclosure further relates to a method for operating an inverter of this kind.