公开(公告)号：US12021410B2

公开(公告)日：2024-06-25

申请号：US18117005

申请日：2023-03-03

Applicant: CYBER POWER SYSTEMS, INC.

Inventor： Jung-Hua Weng ,  Ming-Chuan Lin

IPC: H02J9/06 ,  H02J7/00 ,  H02M1/08 ,  H02M7/217

CPC classification number: H02J9/061 ,  H02J7/0013 ,  H02M1/08 ,  H02M7/217 ,  H02J2207/20

Abstract: A three-phase uninterruptible power system and an operation method thereof are provided. The three-phase uninterruptible power system comprises a DC bus, three power conversion circuits and a control circuit. When the three-phase uninterruptible power system enters a line mode from a battery mode, the control circuit performs a huge current suppression for each power conversion circuit according to a predetermined sequence. The huge current suppression performed for any of the power conversion circuits comprises the following steps: disabling the DC-DC conversion of the power conversion circuit, and having the other two power conversion circuits to additionally share the original load of the disabled power conversion circuit; and after the DC-DC conversion of the power conversion circuit is disabled, enabling the AC-DC conversion of the power conversion circuit, and having the power conversion circuits revert to their original load.