公开(公告)号：US20220360214A1

公开(公告)日：2022-11-10

申请号：US17865606

申请日：2022-07-15

Applicant: SMA Solar Technology AG

Inventor： Marcel Kratochvil ,  Rainer Schmitt ,  Torsten Otto ,  Sybille Pape

IPC: H02S50/00 ,  H02S40/36 ,  H02S40/32

Abstract: The disclosure describes a method for detecting an arc in a direct-current (DC) circuit comprising a DC load, a DC source supplying the DC load, and a circuit arrangement arranged between the DC source and the DC load. A power flow P between an input and an output of the circuit arrangement is suppressed by means of a switching circuit through cyclical interruption such that the power flow P is enabled in an active time window with the first period Δt1 and the power flow P is suppressed in an inactive time window with the second period Δt2. Via detection of an input current Iin flowing at the input and/or an input voltage Uin applied to the input and comparison of values of the input current Iin and/or input voltage Uin detected in the inactive time window with a current threshold value ITH or a voltage threshold value UTH an arc presence criterion is signaled if the input current Iin detected in the inactive time window falls below the current threshold value ITH and/or the input voltage Uin detected in the inactive time window does not exceed the voltage threshold value UTH. The application also describes a circuit arrangement for detecting an arc and a photovoltaic (PV) inverter including such a circuit arrangement.

公开(公告)号：US12132443B2

公开(公告)日：2024-10-29

申请号：US17865606

申请日：2022-07-15

Applicant: SMA Solar Technology AG

Inventor： Marcel Kratochvil ,  Rainer Schmitt ,  Torsten Otto ,  Sybille Pape

IPC: G01R31/66 ,  H02J3/14 ,  H02J3/38 ,  H02S40/32 ,  H02S40/36 ,  H02S50/00

CPC classification number: H02S50/00 ,  G01R31/66 ,  H02J3/14 ,  H02J3/381 ,  H02S40/32 ,  H02S40/36 ,  H02J2300/24

Abstract: The disclosure describes a method for detecting an arc in a direct-current (DC) circuit comprising a DC load, a DC source supplying the DC load, and a circuit arrangement arranged between the DC source and the DC load. A power flow P between an input and an output of the circuit arrangement is suppressed by means of a switching circuit through cyclical interruption such that the power flow P is enabled in an active time window with the first period Δt1 and the power flow P is suppressed in an inactive time window with the second period Δt2. Via detection of an input current Iin flowing at the input and/or an input voltage Uin applied to the input and comparison of values of the input current Iin and/or input voltage Uin detected in the inactive time window with a current threshold value ITH or a voltage threshold value UTH an arc presence criterion is signaled if the input current Iin detected in the inactive time window falls below the current threshold value ITH and/or the input voltage Uin detected in the inactive time window does not exceed the voltage threshold value UTH. The application also describes a circuit arrangement for detecting an arc and a photovoltaic (PV) inverter including such a circuit arrangement.