公开(公告)号：EP4024690A1

公开(公告)日：2022-07-06

申请号：EP21208749.8

申请日：2021-11-17

申请人： DELTA ELECTRONICS (SHANGHAI) CO., LTD

发明人： Yan, Chao ,  Xia, Tao ,  Zhan, Kailiang ,  Liu, Xinwei

IPC分类号： H02M1/42 ,  H02M1/44 ,  H02M1/00 ,  H02M7/219 ,  H02M1/12 ,  H02M7/487

摘要： A three-phase converter (1) and a control method thereof are provided. The three-phase converter (1) includes an AC terminal (11), three filter circuits (14), three bridge arm circuits (13), a capacitor module (15) and a DC terminal (12) connected in sequence and a controller. The midpoints (141) of the filter circuits (14) are connected to the midpoint (151) of the capacitor module (15). The controller controls each bridge arm circuit (13) to work in the first and second modes (Ml, M2) at different time in one line voltage cycle of the AC source (VR, VS, VT). In the first mode (Ml), the bridge arm circuit (13) works in a clamping state. In the second mode (M2), the bridge arm circuit (13) selectively works in a DCM mode or a TCM mode. A switching frequency (fs) is limited to be lower than a preset frequency (fmax). When the three-phase converter (1) works with over 80% of a rated load, a time length of working in the second mode (M2) is 1/3~2/3 of the line voltage cycle.