US 12,445,062 B2
Bipolar power supply system and control method
Xinyu Yu, Shanghai (CN); and Kai Xin, Shanghai (CN)
Assigned to Huawei Digital Power Technologies Co., Ltd., Shenzhen (CN)
Filed by Huawei Digital Power Technologies Co., Ltd., Shenzhen (CN)
Filed on Sep. 28, 2023, as Appl. No. 18/476,615.
Application 18/476,615 is a continuation of application No. PCT/CN2021/084085, filed on Mar. 30, 2021.
Prior Publication US 2024/0022072 A1, Jan. 18, 2024
Int. Cl. H02M 7/49 (2007.01); H02J 1/08 (2006.01); H02J 3/38 (2006.01); H02M 1/00 (2006.01)
CPC H02M 7/49 (2013.01) [H02J 1/08 (2013.01); H02J 3/38 (2013.01); H02M 1/007 (2021.05)] 20 Claims
OG exemplary drawing
 
1. A bipolar power supply system, comprising:
a voltage conversion circuit, configured to:
receive electric energy provided by a power generation circuit; and
output a direct current to an inverter circuit after performing direct current conversion;
the inverter circuit, configured to:
convert the direct current into an alternating current; and
output the alternating current to a power grid,
wherein:
the voltage conversion circuit comprises a positive voltage conversion apparatus and a negative voltage conversion apparatus,
the inverter circuit comprises a positive inverter and a negative inverter,
a positive output end of the positive voltage conversion apparatus is connected to a positive input end of the positive inverter,
a negative output end of the negative voltage conversion apparatus is connected to a negative input end of the negative inverter,
a negative output end of the positive voltage conversion apparatus and a positive output end of the negative voltage conversion apparatus are connected to a first end of a neutral wire, and
a negative input end of the positive inverter and a positive input end of the negative inverter are connected to a second end of the neutral wire; and
a controller, configured to:
detect whether a neutral wire current meets a preset current range, wherein the neutral wire current is a current passing through the neutral wire; and
control, when the neutral wire current does not meet the preset current range, the positive voltage conversion apparatus and the negative voltage conversion apparatus to change output voltages when output power remains unchanged, so that the neutral wire current meets the preset current range.