US 12,483,039 B2
Power conversion apparatus and control method
Aitang Chen, Shanghai (CN); and Dili Zhu, Xi'an (CN)
Assigned to Huawei Digital Power Technologies Co., Ltd., Shenzhen (CN)
Filed by Huawei Digital Power Technologies Co., Ltd., Shenzhen (CN)
Filed on Feb. 22, 2024, as Appl. No. 18/584,765.
Claims priority of application No. 202310193507.2 (CN), filed on Feb. 23, 2023.
Prior Publication US 2024/0291283 A1, Aug. 29, 2024
Int. Cl. H02J 3/46 (2006.01); H02J 3/00 (2006.01); H02J 3/01 (2006.01)
CPC H02J 3/46 (2013.01) [H02J 3/0075 (2020.01); H02J 3/01 (2013.01); H02J 2300/26 (2020.01)] 20 Claims
OG exemplary drawing
 
1. A power conversion apparatus, comprising:
a first direct current conversion circuit having an input end configured to connect to a first photovoltaic string;
a second direct current conversion circuit having an input end configured to connect to a second photovoltaic string, wherein an output end of the first direct current conversion circuit and an output end of the second direct current conversion circuit are connected in parallel to a direct current bus; and
a control circuit configured to, in response to an output voltage of the first photovoltaic string being greater than an output voltage of the second photovoltaic string and a comparison value between the output voltage of the first photovoltaic string and the output voltage of the second photovoltaic string being greater than a first threshold:
control a switching transistor in the first direct current conversion circuit to be turned on or off to decrease the output voltage of the first photovoltaic string and a switching transistor in the second direct current conversion circuit to be turned on or off to increase the output voltage of the second photovoltaic string, so that a comparison value between the output voltage of the second photovoltaic string and a bus voltage of the direct current bus is less than a second threshold.