US 12,476,481 B2
Uninterruptible power supply
Gouyi Chen, Shenzhen (CN)
Assigned to Huawei Digital Power Technologies Co., Ltd., Shenzhen (CN)
Filed by Huawei Digital Power Technologies Co., Ltd., Shenzhen (CN)
Filed on Jun. 28, 2024, as Appl. No. 18/758,260.
Claims priority of application No. 202310791899.2 (CN), filed on Jun. 29, 2023.
Prior Publication US 2025/0007323 A1, Jan. 2, 2025
Int. Cl. H02J 9/06 (2006.01)
CPC H02J 9/062 (2013.01) 20 Claims
OG exemplary drawing
 
1. An uninterruptible power supply comprising:
an alternating current output end;
an inverter, wherein an output end of the inverter is connected to the alternating current output end;
a rectifier, wherein an output end of the rectifier is connected to an input end of the inverter;
alternating current input ends, wherein the alternating current input ends are connected to three phases of alternating current input ends of the rectifier; and
direct current input ends, wherein the direct current input ends are configured to connect to a direct current power supply and connected to direct current input ends of the rectifier,
wherein the rectifier further comprises:
six first rectifier diodes,
six second rectifier diodes,
three alternating current side relays,
six direct current side relays,
a DC/DC conversion unit, and
a controller, wherein each phase of the three phases of alternating current input ends of the rectifier is connected to a first end of each relay of the three alternating current side relays, a second end of each relay of the three alternating current side relays is connected to anodes of two first rectifier diodes, cathodes of the two first rectifier diodes are respectively connected to two phases of positive input ends in three phases of positive input ends of the DC/DC conversion unit, the second end of each relay of the three alternating current side relays is further connected to cathodes of the two second rectifier diodes, anodes of the two second rectifier diodes are respectively connected to two phases of negative input ends in three phases of negative input ends of the DC/DC conversion unit, each phase of input end in the three phases of positive input ends and the three phases of negative input ends of the DC/DC conversion unit is connected to the direct current input end of the rectifier through one direct current side relay, an output end of the DC/DC conversion unit is connected to the output end of the rectifier, and the controller is configured to:
when a voltage of the three phases of alternating current input ends is abnormal, control the DC/DC conversion unit to stop operation, and control the three alternating current side relays to turn off;
after controlling the three alternating current side relays to turn off for a first preset duration, control the six direct current side relays to turn on; and
after controlling the six direct current side relays to turn on for a second preset duration, control the DC/DC conversion unit to resume operation.