EP-4738645-A1 - UNINTERRUPTIBLE POWER SUPPLY AND METHOD FOR CONTROL THEREOF

EP4738645A1EP 4738645 A1EP4738645 A1EP 4738645A1EP-4738645-A1

Abstract

The present invention provides an uninterruptible power supply, including: an input terminal electrically connectable to an alternating current power supply; an output terminal electrically connectable to a load; a primary branch; and a storage battery branch including a power conversion module and a storage battery; where the power conversion module includes the following operating modes: a charging mode, where when an increment of a load amount of the load is less than a preset threshold, the power conversion module is configured to cause the alternating current power supply to charge the storage battery; and a power supply mode, where when the increment of the load amount is greater than or equal to the preset threshold, the power conversion module is configured to convert a direct current output by the storage battery, so as to supply power to the load cooperatively with the alternating current power supply.

Inventors

ZHENG, David
HAO, YULONG
CAO, LEI
YANG, YUE

Assignees

Santak Electronic (Shenzhen) Co., Ltd.

Dates

Publication Date: 20260506
Application Date: 20251023

Claims (10)

An uninterruptible power supply, comprising: an input terminal, configured to be electrically connectable to an alternating current power supply; an output terminal, configured to be electrically connectable to a load; a primary branch, comprising a rectifier module and an inverter module that are electrically connected in sequence between the input terminal and the output terminal; and a storage battery branch, comprising a power conversion module and a storage battery, and configured to be electrically connected to a node between the rectifier module and the inverter module; wherein the power conversion module is configured to be capable of bidirectionally transmitting and converting a direct current, and comprises the following operating modes: a charging mode, wherein, when an increment of a load amount of the load is less than a preset threshold, the power conversion module is configured to cause the alternating current power supply to charge the storage battery; and a power supply mode, wherein, when the increment of the load amount of the load is greater than or equal to the preset threshold, the power conversion module is configured to convert a direct current output by the storage battery, so as to supply power to the load cooperatively with the alternating current power supply.
The uninterruptible power supply according to claim 1, further comprising a controller, the controller is configured to perform the following steps: in the power supply mode, controlling the storage battery and the alternating current power supply to supply power to the load cooperatively and simultaneously controlling an output power of the alternating current power supply to remain unchanged at an instant of a step increase of the load amount in the load; and then, controlling the output power of the alternating current power supply to gradually increase and controlling a power supplied by the storage battery to gradually decrease until the output power of the alternating current power supply balances with power consumption of the load, and then disabling the power supply mode of the power conversion module.
The uninterruptible power supply according to claim 1, further comprising a controller, the controller is configured to perform the following steps: in the power supply mode, controlling the storage battery and the alternating current power supply to supply power to the load cooperatively, and simultaneously controlling an output power of the alternating current power supply to remain unchanged at an instant of a step increase of the load amount in the load; and then, controlling the output power of the alternating current power supply to gradually increase and controlling a power supplied by the storage battery to gradually decrease until the output power of the alternating current power supply and the power supplied by the storage battery each are within a preset range.
The uninterruptible power supply according to any one of claims 1 to 3, the power conversion module comprises two separate DC-DC converters or the power conversion module is a bidirectional DC-DC converter.
The uninterruptible power supply according to any one of claims 1 to 3, wherein the preset threshold is greater than or equal to 50% of an initial value of the load amount.
The uninterruptible power supply according to any one of claims 1 to 3, wherein the inverter module is a bidirectional inverter module.
The uninterruptible power supply according to any one of claims 1 to 3, further comprising a load detection module, wherein the load detection module is configured to detect the load amount of the load, and output a trigger signal to the power conversion module when the increment of the load amount is greater than or equal to the preset threshold; and the power conversion module switches to the power supply mode based on the received trigger signal.
The uninterruptible power supply according to claim 7, wherein the load amount is an electrical parameter of the load.
The uninterruptible power supply according to claim 8, wherein the electrical parameter comprises a load current.
A control method for the uninterruptible power supply according to any one of claims 1 to 9, comprising the following steps: when the increment of the load amount of the load of the uninterruptible power supply is less than the preset threshold, controlling the power conversion module to cause the alternating current power supply to charge the storage battery; and when the increment of the load amount of the load is greater than or equal to the preset threshold, controlling the power conversion module to convert the direct current output by the storage battery, so as to supply power to the load cooperatively with the alternating current power supply.

Description

TECHNICAL FIELD The present invention relates to the field of power supplies, and in particular, to an uninterruptible power supply. BACKGROUND The statements in this part are merely intended to provide background information related to the present invention, to help understand the present invention. The background information does not necessarily constitute the prior art. An uninterruptible power supply (UPS) is a voltage-stable and frequency-stable alternating current power supply that includes a battery and is mainly composed of a rectifier and an inverter. The UPS uses the battery mainly to provide uninterrupted power supply to computer and communication network systems or industrial control systems, industrial devices that require continuous operation, such as computers, servers, storage devices, network devices, and the like, when the power is off. When an input of a mains supply is normal, the UPS stabilizes the voltage of the mains supply and supplies the mains supply to a load for use and to charge the battery at the same time. When the mains supply fails, the UPS provides the electrical energy of the battery to the load, to keep the load operating normally and protect the software and hardware of the load from damage. Based on its excellent uninterruptible power supply capability, the UPS is widely used in various super-large-scale data centers around the world. In recent years, the power consumption designed for data centers is continuously increasing with rapid application of generative artificial intelligence (Al) in the data centers. When an AI algorithm is not operated by a data center (in this case, the data center is in the "idle-state"), most (e.g., 90%) GPUs (Graphics Processing Unit) are in a sleep state. However, when the AI algorithm is run (in this case, the data center is in the "busy-state "), a power requirement of the data center increases as load increases (e.g., increases by at least 50%). Therefore, how to avoid impact or even faults on an alternating current power grid due to a step increase in load when the data center is powered by the alternating current power grid, and how to ensure reliable operation of the data center and avoid power waste of the data center in the idle-state by using a small generator size when the data center is powered by a generator have become urgent problems to be resolved at present. Therefore, it is necessary to improve the UPS to meet power supply requirements under the step increase in load. SUMMARY Therefore, an objective of the present invention is to overcome the foregoing disadvantages in the prior art, and provide an uninterruptible power supply, including: an input terminal, configured to be electrically connectable to an alternating current power supply;an output terminal, configured to be electrically connectable to a load;a primary branch, including a rectifier module and an inverter module that are electrically connected in sequence between the input terminal and the output terminal; anda storage battery branch, including a power conversion module and a storage battery, and configured to be electrically connected to a node between the rectifier module and the inverter module;where the power conversion module is configured to be capable of bidirectionally transmitting and converting a direct current, and includes the following operating modes: a charging mode, where, when an increment of a load amount of the load is less than a preset threshold, the power conversion module is configured to cause the alternating current power supply to charge the storage battery; anda power supply mode, where, when the increment of the load amount of the load is greater than or equal to the preset threshold, the power conversion module is configured to convert a direct current output by the storage battery, so as to supply power to the load cooperatively with the alternating current power supply. According to the uninterruptible power supply of the present invention, preferably, a controller is further included, and the controller is configured to perform the following steps: in the power supply mode, controlling the storage battery and the alternating current power supply to supply power to the load cooperatively and simultaneously controlling an output power of the alternating current power supply to remain unchanged at an instant of a step increase of the load amount in the load; andthen, controlling the output power of the alternating current power supply to gradually increase and controlling a power supplied by the storage battery to gradually decrease until the output power of the alternating current power supply balances with power consumption of the load, and then disabling the power supply mode of the power conversion module. According to the uninterruptible power supply of the present invention, preferably, a controller is further included, and the controller is configured to perform the following steps: in the power supply mode, controlling t