公开(公告)号：US20240192273A1

公开(公告)日：2024-06-13

申请号：US18531848

申请日：2023-12-07

Applicant: ABB E-mobility B.V.

Inventor： Michele Motta ,  Gianluca Rondine ,  Simone Paolini ,  Giulio Betti ,  Martino Romano ,  Marco Lega

IPC: G01R31/327 ,  H02M7/79

CPC classification number: G01R31/327 ,  H02M7/79

Abstract: A converter arrangement connects to a DC source or load and to a plurality of AC terminals. Each converter arrangement includes a DC part with two capacitors arranged in parallel to the DC source or DC load and a neutral DC point between them. At least one AC leg is connected to a neutral AC point via an AC leg capacitor. A pre-charge unit is arranged at each leg of the AC terminal. The method includes opening a decoupling switch and all second AC switches; loading the pre-charge unit; sequentially closing each second AC switch; measuring at each closing step a voltage between each AC leg of the second converter arrangement; and determining the stuck AC switch of the second converter arrangement based on the measured voltage.