US 12,470,126 B2
Power system and circulating current suppression method thereof
Hsin-Chih Chen, Taoyuan (TW); Li-Hung Wang, Taoyuan (TW); Chao-Li Kao, Taoyuan (TW); Yi-Ping Hsieh, Taoyuan (TW); and Hung-Chieh Lin, Taoyuan (TW)
Assigned to Delta Electronics, Inc., Taoyuan (TW)
Filed by Delta Electronics, Inc., Taoyuan (TW)
Filed on Sep. 7, 2023, as Appl. No. 18/243,626.
Claims priority of application No. 202310790730.5 (CN), filed on Jun. 30, 2023.
Prior Publication US 2025/0007389 A1, Jan. 2, 2025
Int. Cl. H02M 1/12 (2006.01); H02M 1/00 (2006.01); H02M 7/487 (2007.01); H02M 1/42 (2007.01)
CPC H02M 1/123 (2021.05) [H02M 1/0048 (2021.05); H02M 7/487 (2013.01); H02M 1/4216 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A circulating current suppression method of a power system having a plurality of power modules, wherein each of the plurality of power modules comprises a high-voltage bus, a low-voltage bus and a balance circuit having a neutral voltage, and the circulating current suppression method comprises:
in each of the balance circuits, disposing a first capacitor electrically coupled between the high-voltage bus and the neutral voltage, and disposing a second capacitor electrically coupled between the neutral voltage and the low-voltage bus;
acquiring a current effective value of an input of each of the plurality of power modules;
if detecting that the current effective value of at least one of the plurality of power modules doesn't remain at a current reference value, determining that a circulating current occurs in the at least one of the plurality of power modules; and
operating the balance circuit of the at least one of the plurality of power modules to charge the first capacitor or the second capacitor to regulate the neutral voltage for suppressing the circulating current.