Power supply circuit and uninterruptible power supply system

Abstract

The embodiment of the present application provides a power supply circuit, comprising: a first power conversion module, a plurality of battery groups, a first bus and a second bus, a first connecting terminal of the first power conversion module being connected with the battery groups, a second connecting terminal of the first power conversion module being connected with the first bus and the second bus, the first power conversion module being used for carrying out DC / DC conversion on output current of the corresponding battery group and outputting the current to the first bus and the second bus. The number of the battery groups can be set to be less than the number of inverters in the UPS system, so that the cost is reduced, meanwhile, by setting the first bus and the second bus, when any one of the buses is faulty, the other bus can also provide power for the inverter, so that the power supply reliability of the UPS system is improved.

Description

[0001] This application is a divisional application of the original application with the application number 201910615941.9 and the original filing date of July 09, 2019, and the entire contents of the original application are incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of electronic communication, in particular to a power supply circuit and an uninterruptible power supply (UPS) system. BACKGROUND

[0003] The uninterruptible power supply (UPS) system is a device capable of continuously supplying power to the load. The UPS system is usually composed of the following parts: rectifier, inverter, battery pack and mains input. When the mains input of the UPS system is normal, the mains input supplies power to the load through the rectifier and the inverter. When the mains input of the UPS system fails, the battery pack supplies power to the load through the inverter to ensure normal output.

[0004] In the prior art, the UPS system is used to supply power to the information and communication technology (ICT) equipment, and in order to ensure the reliability of the power supply and distribution of the ICT equipment, two sets of power supply systems are usually used in a redundant backup manner to supply power. Referring to Figure 1 , the inverter A1, the inverter A2 and the inverter A3 can respectively convert the current output by the battery pack 1, the battery pack 2 and the battery pack 3 into direct current alternating current (DC / AC) when the mains input is abnormal, and supply power to the ICT equipment. The inverter B1, the inverter B2 and the inverter B3 are backups of the inverter A1, the inverter A2 and the inverter A3 respectively. The battery pack 1 and the battery pack 4 are connected through the switch K14. Under normal circumstances, K14 is disconnected, the battery pack 1 supplies power to the inverter B1 through K1, and the battery pack 4 supplies power to the inverter B1 through K4. When the inverter A1 fails, K1 is disconnected. In order to not let the battery pack 1 idle, K14 is closed, the battery pack 1 is connected in parallel with the battery pack 4 through K14 to form a shared battery pack, and supplies power to the inverter B1 through K4. Similarly, the battery pack 2 and the battery pack 5 are connected in parallel, and the battery pack 3 and the battery pack 6 are connected in parallel.

[0005] However, under normal circumstances, each inverter needs to be provided with power by a battery pack, so the number of battery packs cannot be less than the number of inverters. Since the number of inverters is large, the number of corresponding battery packs is also large, and the cost is high. SUMMARY

[0006] The embodiment of the present application provides a power supply scheme, including a power supply circuit, an uninterrupted power supply (UPS) system and a power supply method. On the one hand, the number of battery groups can be less than the number of inverters in the UPS system, thereby reducing the cost. On the other hand, the power supply reliability of the UPS system is improved.

[0007] In a first aspect, the present application provides a power supply circuit, which is applied to an uninterrupted power supply (UPS) system, and the power supply circuit comprises:

[0008] a first power conversion module, a battery group, a first bus and a second bus;

[0009] The first wiring end of the power conversion module is connected with the battery group, the second wiring end of the first power conversion module is connected with the first bus and the second bus, and the first power conversion module is used for performing DC / DC conversion on the output current of the battery group and outputting the current to the first bus and the second bus.

[0010] In the above manner, on the one hand, the number of battery groups can be less than the number of inverters in the UPS system due to the fact that the power supply bus can converge the electric energy output by the battery group, thereby reducing the cost. On the other hand, when any one of the first bus and the second bus fails, the other bus can provide electric energy for the inverter, thereby improving the power supply reliability of the UPS system.

[0011] In an optional design of the first aspect, the first power conversion module is further used for receiving the current output by the first bus and the second bus, performing DC / DC conversion on the current output by the first bus and the second bus, and supplying power to the battery group.

[0012] In the embodiment, the first bus and the second bus can provide electric energy for the battery group through the first power conversion module, and no additional charging circuit is needed, thereby reducing the cost.

[0013] In an optional design of the first aspect, the first power conversion module is a bidirectional DC / DC converter.

[0014] In a second aspect, the present application provides an uninterrupted power supply (UPS) system, which comprises:

[0015] a first inverter circuit, a second inverter circuit and a battery power supply circuit;

[0016] The battery power supply circuit comprises:

[0017] a first power conversion module, a battery group, a first bus and a second bus;

[0018] The first terminal of the first power conversion module is connected with the battery pack, and the second terminal of the first power conversion module is connected with the first bus and the second bus, and the first power conversion module is configured to perform DC / DC conversion on the output current of the battery pack and output the current to the first bus and the second bus;

[0019] The first bus is connected with the DC input terminal of the first inverter circuit, and the first inverter circuit is configured to perform DC / AC conversion on the current output by the first bus and supply power to the load.

[0020] The second bus is connected with the DC input terminal of the second inverter circuit, and the second inverter circuit is configured to perform DC / AC conversion on the current output by the second bus and supply power to the load.

[0021] In an optional design of the second aspect, the second inverter circuit is specifically configured to perform DC / AC conversion on the current output by the second bus and supply power to the load when the path from the first inverter to the load fails.

[0022] In the embodiments of the present application, the second inverter (backup inverter) and the first inverter 304 (non-backup inverter) are connected to different power supply buses. When the first bus fails, the first inverter cannot normally supply power to the load, but the backup inverter (second inverter) cannot supply power to the load. This improves the power supply reliability of the UPS system.

[0023] In an optional design of the second aspect, the first power conversion module is further configured to receive the current output by the first bus and the second bus, perform DC / DC conversion on the current output by the first bus and the second bus, and supply power to the battery pack.

[0024] In an optional design of the second aspect, the first power conversion module is a bidirectional DC / DC converter.

[0025] In an optional design of the second aspect, the UPS system further comprises a second power conversion module and a third power conversion module.

[0026] The second power conversion module is connected between the first bus and the DC input terminal of the first inverter circuit, and the second power conversion module is configured to perform DC / DC conversion on the current output by the first bus and input the current to the DC input terminal of the first inverter circuit.

[0027] The first inverter is configured to perform DC / AC conversion on the current output by the second power conversion module and supply power to the load.

[0028] The third power conversion module is connected between the second bus and the DC input terminal of the second inverter circuit. The third power conversion module is used to perform DC / DC conversion on the current output from the second bus and input current to the DC input terminal of the second inverter circuit.

[0029] The second inverter is used to perform DC / AC conversion on the current output by the third power conversion module and supply power to the load.

[0030] Thirdly, this application provides a power supply method, which is applied to a power supply circuit, the power supply circuit comprising:

[0031] First power conversion module, battery pack, first busbar and second busbar;

[0032] The first terminal of the first power conversion module is connected to the battery pack, and the second terminal of the first power conversion module is connected to the first bus and the second bus.

[0033] The method includes:

[0034] The first power conversion module performs DC / DC conversion on the output current of the battery pack and outputs current to the first bus and the second bus.

[0035] Fourthly, this application provides an uninterruptible power supply (UPS) method, which is applied to a UPS system, the UPS system comprising:

[0036] The circuit consists of a first inverter circuit, a second inverter circuit, and a battery power supply circuit.

[0037] The battery power supply circuit includes:

[0038] First power conversion module, battery pack, first busbar and second busbar;

[0039] The first terminal of the first power conversion module is connected to the battery pack, and the second terminal of the first power conversion module is connected to the first bus and the second bus.

[0040] The first busbar is connected to the DC input terminal of the first inverter circuit;

[0041] The second busbar is connected to the DC input terminal of the second inverter circuit;

[0042] The method includes:

[0043] The first power conversion module performs DC / DC conversion on the output current of the battery pack and outputs current to the first bus and the second bus;

[0044] The first inverter circuit converts the current output by the first bus into AC and supplies power to the load;

[0045] The second inverter circuit converts the current output by the second bus into AC and supplies power to the load.

[0046] It should be understood that the power supply scheme provided by the embodiments of the present application, by the above-mentioned manner, on the one hand, through the setting of the first bus and the second bus, since the power supply bus can converge the output power of the battery pack, therefore, the number of battery packs can be less than the number of inverters in the UPS system, thereby reducing the cost, on the other hand, by setting the first bus and the second bus, when any one of the buses fails, the other bus can also provide power for the inverter, thereby improving the power supply reliability of the UPS system. BRIEF DESCRIPTION OF DRAWINGS

[0047] Figure 1 is a structural schematic diagram of a power supply system;

[0048] Figure 2 is a schematic diagram of a power supply method for a data center (or computer room);

[0049] Figure 3a is a structural schematic diagram of a power supply circuit provided by the embodiments of the present application;

[0050] Figure 3b is a structural schematic diagram of another power supply circuit provided by the embodiments of the present application;

[0051] Figure 4 is a structural schematic diagram of another power supply circuit provided by the embodiments of the present application;

[0052] Figure 5 is a structural schematic diagram of an uninterruptible power supply (UPS) system provided by the embodiments of the present application;

[0053] Figure 6 is a flowchart of an uninterruptible power supply method provided by the embodiments of the present application;

[0054] Figure 7 is a flowchart of another uninterruptible power supply method provided by the embodiments of the present application. DETAILED DESCRIPTION

[0055] The embodiments of the present application will be described below in conjunction with the accompanying drawings, obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Those skilled in the art can know that, with the development of technology and the appearance of new scenes, the technical solutions provided by the embodiments of the present application are also applicable to similar technical problems.

[0056] The terms "first", "second", and the like, in the description and in the claims of the present application and above-described drawings, are used to distinguish similar objects, and are not necessarily used to describe a particular sequential or chronological order. It should be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments described herein are capable of operating in other sequences than illustrated or described herein. Moreover, the terms "comprise", "have" and any variations thereof are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or apparatus that comprises a list of steps or modules as non- limiting examples of those steps or modules that can be present in the process, method, system, product or apparatus, but not necessarily exhaustive of all of the steps or modules that can be present in the process, method, system, product or apparatus. The naming or numbering of the steps appearing in the present application does not mean that the steps in the method flow must be executed in the order or logical sequence indicated by the naming or numbering, and the named or numbered steps can be executed in a different order according to the technical purpose to be achieved, as long as the same or similar technical effects can be achieved.

[0057] Referring to Figure 2 , Figure 2 is a schematic diagram of the existing power supply method for a data center (or machine room), and it should be noted that Figure 2 The number of UPSs in is only an example, and the number of UPSs in actual applications can be selected according to requirements, which is not limited here.

[0058] The existing data center (or machine room) adopts an alternating current power supply mode, and in order to ensure the reliability of power supply and distribution of the entire data center equipment, a two-set power supply system redundant backup mode is adopted for power supply. Specifically, referring to Figure 2 , the high-voltage power supply system includes two power input, oil machine input and two branch outputs (branch A and branch B), and branch B is a backup of branch A, wherein branch A is input to UPS A1 and UPS A2 in the machine room after passing through isolation transformer A and input distribution cabinet A, and branch B is input to UPS B1 and UPS B2 in the machine room after passing through isolation transformer B and input distribution cabinet B.

[0059] If the output of input distribution cabinet A is normal, and rectifier A1 and rectifier A2 are working normally, then rectifier A1 and rectifier A2 will take the output of input distribution cabinet B as the source of electrical energy, and then perform direct current (DC) to alternating current (AC) conversion through rectifiers, and then perform AC to DC conversion through inverters, and the output AC power is input to the ICT equipment cabinet in the machine room through output distribution cabinet A and column head cabinet A, and supplies power to the ICT equipment load.

[0060] If the output of the input distribution cabinet A is abnormal, but inverters A1 and A2 are working normally, then battery pack 1 (deployed on battery rack 1) is connected to the DC input terminal of inverter A1. Inverter A1 uses battery pack 1 as the source of power, performs DC-to-AC conversion, and outputs AC power to distribution cabinet A. The AC power is then input to the ICT equipment rack in the computer room through the head cabinet A to power the ICT equipment load.

[0061] If the power supply path from battery pack 1 to the ICT equipment load fails, UPS B1 will serve as a backup for UPS A1. In this case, UPS B1 will output AC power, which will then pass through output distribution cabinet B and rack cabinet B to supply power to the ICT equipment rack in the computer room.

[0062] However, the battery states of the battery bank and its backup battery bank may differ, and due to potential differences in output voltage, the battery banks cannot be connected in parallel. Furthermore, since each UPS requires a corresponding battery bank, when there are 2N UPSs (N of which are backup UPSs), 2N battery banks are needed to provide power. With a large number of UPSs, this results in a large number of battery banks and higher costs.

[0063] To address the aforementioned technical problems, this application provides a power supply circuit 300, which can be applied to an uninterruptible power supply (UPS) system. (See also...) Figure 3a , Figure 3a This is a schematic diagram of the structure of a power supply circuit 300 provided in an embodiment of this application, as shown below. Figure 3a As shown, the power supply circuit 300 includes: a plurality of first power conversion modules 302, a plurality of battery packs 301, a first bus 3031, and a second bus 3032. Furthermore, the power supply circuit 300 may also include a plurality of switches 307 and a plurality of overcurrent protection modules 306.

[0064] In this embodiment, the first power conversion module 302 can be deployed in a current sharing cabinet and shared with the corresponding battery pack 301 on a battery rack. It should be noted that the power supply circuit 300 provided in this embodiment can be applied to... Figure 2 In the corresponding scenario, specifically, the first power conversion module 302 and the battery pack 301 can be deployed in... Figure 2 In the battery rack (e.g., battery rack 1, battery rack 2, battery rack 3 or battery rack 4).

[0065] The first busbar 3031 and the second busbar 3032 can be deployed in a current combiner cabinet. It should be noted that the first busbar 3031 and the second busbar 3032 can be deployed in... Figure 2On the passage between the middle battery rack and the inverter, in an embodiment, a current busbar cabinet can be added on the passage between the battery rack and the inverter, and a first busbar 3031 and a second busbar 3032 are arranged in the current busbar cabinet.

[0066] As shown in the figure, the first connecting terminal of the first power conversion module 302 is connected with the battery pack 301, and the second connecting terminal of the first power conversion module 302 is connected with the first busbar 3031 and the second busbar 3032. The first power conversion module 302 is used for performing DC / DC conversion on the output current of the corresponding battery pack 301, and outputting the current to the first busbar 3031 and the second busbar 3032. Figure 3a

[0067] In the embodiment of the present application, the first power conversion module 302 can be a DC / DC converter. The first connecting terminal of the first power conversion module 302 can receive the current input by the battery pack 301, and perform DC / DC conversion on the current input by the battery pack 301, so as to change the voltage value of the current input by the battery pack 301, and output the current.

[0068] It should be noted that a current protection module 306 or other modules can also be connected between the first power conversion module 302 and the battery pack 301. The current protection module 306 can be a fuse, a circuit breaker, etc. When the battery pack 301 fails to cause the output current to be too large, the current protection module 306 can disconnect the passage between the first power conversion module 302 and the battery pack 301.

[0069] It should be noted that since the second connecting terminal of each of the plurality of first power conversion modules 302 in the embodiment of the present application is connected with the first busbar 3031 and the second busbar 3032, the plurality of first power conversion modules 302 can perform DC / DC conversion on the current output by the corresponding battery pack 301, and output the current with the same voltage to the first busbar 3031 and the second busbar 3032, that is, the voltage values of the currents output by any two of the plurality of first power conversion modules 302 to the first busbar 3031 and the second busbar 3032 are the same.

[0070] In the embodiment of the present application, the first power conversion module 302 can perform DC / DC conversion on the current output by the battery pack 301, so as to control the voltage values of the currents output by the plurality of first power conversion modules 302 to be equal, so that the plurality of battery packs 301 can be connected with the first busbar 3031 and the second busbar 3032 even if the output voltages are different.

[0071] ​In the embodiment of the present application, the first bus 3031 and the second bus 3032 can converge the current output by the battery pack 301 and output the direct current to the inverter in the UPS system.

[0072] Compared with the prior art, each inverter needs to correspond to a battery pack, in the embodiment of the present application, since the power supply bus (the first bus and the second bus) can converge the power output by multiple battery packs, it is not necessary to set a battery pack for each inverter, and the power supply bus can be used as a common "power supply", thereby making the number of battery packs less than the number of inverters.

[0073] Specifically, the first bus can be connected with one or more first inverters 304, and the second bus can be connected with one or more second inverters 305. In the embodiment of the present application, the direct current input end of the first inverter 304 is connected with the first bus 3031, the alternating current output end of the first inverter 304 is connected with the load 308, and the first inverter 304 is used for converting the direct current output by the first bus 3031 into alternating current and providing power to the load 305. The direct current input end of the second inverter 305 is connected with the second bus 3032, the alternating current output end of the second inverter 305 is connected with the load 308, and the second inverter 305 is used for converting the direct current output by the second bus 3032 into alternating current and providing power to the load 305.

[0074] Optionally, the second inverter 305 can be a backup of the first inverter 304. Specifically, when the first inverter 304 works abnormally, the path between the abnormal first inverter 304 and the load 308 can be disconnected, and the corresponding second inverter 305 can replace the abnormal first inverter 304 to supply power to the load 308.

[0075] In the embodiment of the present application, since the second inverter 305 (backup inverter) and the first inverter 304 (non-backup inverter) are connected to different power supply buses, when the first bus 3031 fails, the first inverter cannot normally supply power to the load 308, but the backup inverter (the second inverter 305) cannot supply power to the load 308. This improves the power supply reliability of the UPS power supply system.

[0076] It should be noted that in the embodiment of the present application, the first bus 3031 and the first power conversion module 302, the second bus 3032 and the first power conversion module 302, the first bus 3031 and the first inverter 304, and the second bus 3032 and the second inverter 305 can be connected with an overcurrent protection module 306, which can be a fuse, a circuit breaker, or the like.

[0077] Specifically, when a fault occurs on the first bus 3031, the overcurrent protection module 306 can disconnect the path between the first bus 3031 and the first power conversion module 302, and the path between the first bus 3031 and the first inverter 304. When a fault occurs on the second bus 3032, the overcurrent protection module 306 can disconnect the path between the second bus 3032 and the first power conversion module 302, and the path between the second bus 3032 and the second inverter 305.

[0078] It should be noted that a switch 307 can also be connected between the first power conversion module 302 and the first bus 3031. When the overcurrent protection module 306 between the power conversion module 310 and the first bus 3031 is disconnected, the switch 307 can be further disconnected to isolate the first bus 3031 and the first power conversion module 302.

[0079] In the embodiment of the present application, when the first bus 3031 fails, the battery pack 301 can input current to the second bus 3032 through the power conversion module 302.

[0080] In the embodiment of the present application, when the second bus 3032 fails, the battery pack 301 can input current to the first bus 3031 through the power conversion module 302.

[0081] In the embodiment of the present application, by setting the first bus and the second bus, when any one of the buses fails, the other bus can also provide power for the inverter, thereby improving the power supply reliability of the UPS system.

[0082] It should be noted that in the embodiment of the present application, the number of buses can also exceed two, and the present application is not limited.

[0083] Referring to Figure 3b , Figure 3b A structure diagram of a power supply circuit 300 provided in the embodiment of the present application is shown in FIG. 3. Figure 3b As shown in FIG. 3, the number of the first bus 3031 can be multiple.

[0084] In other scenarios, the number of the second bus can also be set to multiple, which is not limited herein.

[0085] The embodiment of the present application provides a power supply circuit 300, which comprises a first power conversion module 302, a battery pack 301, a first bus 3031 and a second bus 3032, a first wiring terminal of the first power conversion module 302 is connected with the battery pack 301, a second wiring terminal of the first power conversion module 302 is connected with the first bus 3031 and the second bus 3032, and the first power conversion module 302 is used for carrying out direct current-direct current (DC / DC) conversion on output current of the corresponding battery pack 301 and outputting current to the first bus 3031 and the second bus 3032. Through the above manner, on one hand, due to the fact that the power supply bus can converge the electric energy output by the battery pack 301, the number of the battery packs can be less than the number of inverters in the UPS system, and the cost is reduced, on the other hand, by arranging the first bus and the second bus, when any one of the buses fails, the other bus can also provide electric energy for the inverter, and the power supply reliability of the UPS system is improved.

[0086] With reference to Figure 4 , Figure 4 The structure schematic diagram of another power supply circuit 300 provided by the embodiment of the present application is as shown in the figure, Figure 4 , and Figure 3a and Figure 3b Corresponding to the embodiment, different from the embodiment, the power supply circuit 300 further comprises a control circuit 400.

[0087] In the embodiment of the present application, one end of the control circuit 400 is connected with the output end of the battery pack 301 respectively, and the other end of the control circuit 400 is connected with the second wiring terminal of the first power conversion module 302 respectively.

[0088] In the embodiment of the present application, the control circuit 400 is used for acquiring a plurality of output voltage values of the plurality of battery packs 301, and sending a control signal to the third wiring terminal of the first power conversion module 302 according to the plurality of output voltage values of the plurality of battery packs 301, so that the first power conversion module 302 controls the voltage value of the current output by the second wiring terminal according to the control signal.

[0089] In the embodiment of the present application, the output voltage value of the battery pack 301 can be acquired by arranging a sampling device (for example, a voltage transformer) at the output end of the battery pack 301.

[0090] Optionally, the output voltage value of the battery pack 301 can be acquired by adopting a centralized sampling mode, for example, by using a digital signal processing technology (DSP).

[0091] In the embodiments of the present application, the third terminal of the first power conversion module 302 can be a control signal input terminal of the power conversion module.

[0092] In one embodiment, the first power conversion module 302 can adjust the output current duty cycle of the switching device contained therein according to the control signal, thereby controlling the voltage value of the output current.

[0093] In one embodiment, the control circuit 400 can obtain a plurality of output voltage values of the plurality of battery packs 301, and determine the average value V1 of the plurality of output voltage values as the target voltage value, and then send the control signal to the third terminal of the plurality of first power conversion modules 302, and the plurality of first power conversion modules 302 can control the voltage value of the current output by the second terminal according to the control signal to be V1.

[0094] In one embodiment, the control circuit 400 can obtain a plurality of output voltage values of the plurality of battery packs 301, and determine the maximum voltage value V2 of the plurality of output voltage values as the target voltage value, and then send the control signal to the third terminal of the plurality of first power conversion modules 302, and the plurality of first power conversion modules 302 can control the voltage value of the current output by the second terminal according to the control signal to be V2.

[0095] In one embodiment, the control circuit 400 can obtain a plurality of output voltage values of the plurality of battery packs 301, and determine the minimum voltage value V3 of the plurality of output voltage values as the target voltage value, and then send the control signal to the third terminal of the plurality of first power conversion modules 302, and the plurality of first power conversion modules 302 can control the voltage value of the current output by the second terminal according to the control signal to be V3.

[0096] In another embodiment of the present application, the control circuit 400 is further configured to obtain a plurality of output current values of the plurality of battery packs 301, and send a control signal to the third terminal of the first power conversion module 302 according to the plurality of output current values of the plurality of battery packs 301, so that the first power conversion module 302 controls the current value of the current output by the second terminal according to the control signal.

[0097] Due to the individual differences of the battery packs, the on-resistance differs greatly, or the number of battery cells, the state of capacity (SOC) or the state of health (SOH) of the battery packs are not the same, so that the output current of the parallel connected battery packs is not balanced; and since the on-resistance is a negative temperature coefficient characteristic, the battery pack with large current will eventually bear all the current and be disconnected or damaged.

[0098] In the embodiment of the present application, the first power conversion module 302 can control the current value of the output current according to the control signal sent by the control circuit 400, so as to realize the output current sharing or proportional current sharing of the battery pack.

[0099] In one embodiment, the first power conversion module 302 can control the conduction angle of the switching device included therein according to the control signal sent by the control circuit 400, thereby realizing the control of the current value of the output current. For example, for a unidirectional sine wave, the conduction angle is 180 degrees when the full cycle is conducted.

[0100] In another embodiment of the present application, the first power conversion module 302 is a bidirectional power conversion module, for example, the first power conversion module 302 can be a bidirectional DC / DC converter.

[0101] In the embodiment of the present application, the first power conversion module 302 is further configured to receive the output current of the first bus 3031 and the second bus 3032, perform DC / DC conversion on the output current of the first bus 3031 and the second bus 3032, and charge the battery pack 301.

[0102] When the battery pack 301 needs to be charged, the first power conversion module 302 can receive the output current of the first bus 3031 and the second bus 3032, at this time, the first power conversion module 302 can adjust the voltage value of the current to the charging voltage required when charging the battery pack 301 by performing DC / DC conversion on the output current of the first bus 3031 and the second bus 3032.

[0103] In another embodiment of the present application, the first power conversion module 302 can include a first unidirectional discharge module and a first unidirectional charging module, which are coupled in parallel between the first bus and the battery pack and the second bus and the battery pack, the first unidirectional discharge module is configured to perform DC / DC conversion on the output current of the battery pack and output the current to the first bus and the second bus, and the first unidirectional charging module is configured to receive the output current of the first bus and the second bus, perform DC / DC conversion on the current, and charge the battery pack.

[0104] Optionally, the first unidirectional discharge module and the first unidirectional charging module can be unidirectional DC / DC converters.

[0105] In the embodiment, the power supply circuit 300 can include a transmitter, at least one processor, a memory, a communication bus, and a sampling module; the at least one processor and the memory are connected through the communication bus and complete communication with each other, wherein:

[0106] The communication bus can be an RS485 bus, an RS232 bus, a controller area network (CAN) bus, or the like; or the communication bus 404 can be an industry standard architecture (ISA) bus, a peripheral component (PCI) bus, an extended industry standard architecture (EISA) bus, or the like; the bus can be divided into an address bus, a data bus, a control bus, and the like.

[0107] The memory is configured to store executable program code, and the executable program code comprises computer operation instructions. The memory can include a high-speed RAM memory, and can further include a non-volatile memory such as at least one disk memory.

[0108] The processor is configured to execute the executable program code stored in the memory; the processor can be a central processing unit (CPU), or an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present application.

[0109] The sampling module is configured to acquire output voltage values of the plurality of battery packs 301.

[0110] The processor is configured to generate a control signal according to the output voltage values of the plurality of battery packs 302.

[0111] The transmitter is configured to transmit the control signal to the third terminal of the plurality of first power conversion modules 302, so that the first power conversion modules 302 control the voltage values of the currents output by the second terminals according to the control signal.

[0112] In an embodiment, the sampling module is further configured to acquire output current values of the plurality of battery packs 301.

[0113] The processor is configured to generate a control signal according to the output current values of the plurality of battery packs 301.

[0114] The transmitter is configured to transmit the control signal to the third terminal of the plurality of first power conversion modules 302, so that the plurality of first power conversion modules 302 control the current values of the currents output by the second terminals according to the control signal.

[0115] Reference Figure 5 ,Figure 5 A structure schematic diagram of a UPS system provided by the embodiment of the present application is provided, wherein the description about the first bus 3031, the second bus 3031, the first power conversion module 302 and the battery pack 301 can refer to the description of the above embodiment, which is not limited here.

[0116] In the embodiment of the present application, the first rectifier 501 can perform DC / AC conversion on the AC current input by the commercial power, and then the first inverter 304 performs AC / DC conversion on the DC current output by the first rectifier 501 and supplies power to the load 308. If the commercial power input is abnormal, the second power conversion module 309 receives the DC current output by the first bus 3031 and performs DC / DC conversion on the DC current output by the first bus 3031, and then the first inverter 304 performs DC / AC conversion on the DC current output by the bidirectional DC / DC converter second power conversion module 309 and supplies power to the load 340.

[0117] In the embodiment of the present application, the second power conversion module 309 can be a bidirectional DC / DC converter, and the second power conversion module 309 can boost the DC current output by the first bus 3031.

[0118] When the power supply path from the first bus 3031 to the first inverter 304 fails, the second rectifier 502 can perform DC / AC conversion on the AC current input by the commercial power, and then the second inverter 305 performs AC / DC conversion on the DC current output by the second rectifier 502 and supplies power to the load 308. If the commercial power input is abnormal, the third power conversion module 310 receives the DC current output by the second bus 3032 and performs DC / DC conversion on the DC current output by the second bus 3032, and then the second inverter 305 performs DC / AC conversion on the DC current output by the third power conversion module 310 and supplies power to the load 340.

[0119] In the embodiment of the present application, the third power conversion module 310 can be a bidirectional DC / DC converter, and the third power conversion module 310 can boost the DC current output by the second bus 3032.

[0120] Next, a power supply method provided by the embodiment of the present application is described, which refers to Figure 6 , Figure 6 A flowchart of a power supply method provided by the embodiment of the present application is provided, wherein the method is applied to a power supply circuit, and the power supply circuit comprises:

[0121] a first power conversion module, a battery pack, a first bus and a second bus;

[0122] The first terminal of the first power conversion module is connected with the battery pack, and the second terminal of the first power conversion module is connected with the first bus and the second bus.

[0123] The method comprises:

[0124] The first power conversion module, the battery pack, the first bus and the second bus are specifically described in the above embodiments, and thus will not be repeated here.

[0125] The power supply method provided by the embodiments of the present application comprises:

[0126] 601. The first power conversion module performs DC / DC conversion on the output current of the battery pack and outputs the current to the first bus and the second bus.

[0127] The embodiments of the present application also provide a UPS power supply method, wherein the method is applied to a UPS system, and the UPS system comprises:

[0128] The first inverter circuit, the second inverter circuit and the battery supply circuit;

[0129] The battery supply circuit comprises:

[0130] The first power conversion module, the battery pack, the first bus and the second bus;

[0131] The first terminal of the first power conversion module is connected with the battery pack, and the second terminal of the first power conversion module is connected with the first bus and the second bus;

[0132] The first bus is connected with the DC input terminal of the first inverter circuit;

[0133] The second bus is connected with the DC input terminal of the second inverter circuit;

[0134] With reference to Figure 7 The UPS power supply method provided by the embodiments of the present application comprises:

[0135] 701. The first power conversion module performs DC / DC conversion on the output current of the battery pack and outputs the current to the first bus and the second bus;

[0136] 702. The first inverter circuit performs DC / AC conversion on the current output by the first bus and supplies power to the load;

[0137] 703. The second inverter circuit performs DC / AC conversion on the current output by the second bus and supplies power to the load.

[0138] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described system, device and unit can refer to the corresponding processes in the foregoing method embodiments, which will not be repeated here.

[0139] In several embodiments provided in the present application, it should be understood that the disclosed system, device and method can be implemented in other ways. For example, the above-described device embodiments are only schematic, for example, the division of units is only a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interface, device or unit, and can be electrical, mechanical or other forms.

[0140] The units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, that is, they can be located in one place, or can be distributed on a plurality of network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiment.

[0141] In addition, each functional unit in each embodiment of the present application can be integrated in one processing unit, or each unit can be physically present separately, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or in the form of a software functional unit.

[0142] The integrated unit, if realized in the form of a software functional unit and sold or used as an independent product, can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application essentially or the part that contributes to the prior art or the whole or part of the technical solutions can be embodied in the form of a software product, which is stored in a storage medium, includes a number of instructions to make a computer device (which can be a personal computer, a server, or other network devices, etc.) execute the methods of the present application Figure 2 The embodiments described above or part of the steps. The foregoing storage medium includes: U disk, mobile hard disk, read-only memory (read-only memory, ROM), random access memory (random access memory, RAM), magnetic disk or optical disk and various program codes that can be stored in the medium.

[0143] The above-described embodiments are only used to illustrate the technical solutions of the present application, but not limit the present application; although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An uninterruptible power supply (UPS) system, comprising: The UPS system comprises: a first inverter circuit, a second inverter circuit and a battery power supply circuit; the battery power supply circuit comprises: a plurality of first power conversion modules, a plurality of battery groups, a first bus and a second bus; a first connection terminal of each of the plurality of first power conversion modules is connected with a corresponding battery group of the plurality of battery groups, a second connection terminal of the each of the plurality of first power conversion modules is connected with the first bus and the second bus, and the each of the plurality of first power conversion modules is configured to perform DC / DC conversion on output current of the corresponding battery group and output current to the first bus and the second bus; the first bus is connected with a DC input terminal of the first inverter circuit, and the first inverter circuit is configured to perform DC / AC conversion on the current output by the first bus and supply power to a load; the second bus is connected with a DC input terminal of the second inverter circuit, and the second inverter circuit is configured to perform DC / AC conversion on the current output by the second bus and supply power to the load.

2. The UPS system of claim 1, wherein, The second inverter circuit is specifically configured to perform DC / AC conversion on the current output by the second bus and supply power to the load when a path from the first inverter circuit to the load is faulty.

3. The UPS system of claim 1 or 2, wherein, The first power conversion module is further configured to receive the current output by the first bus and the second bus, perform DC / DC conversion on the current output by the first bus and the second bus, and supply power to the battery group.

4. The UPS system of claim 1 or 2, wherein, The first power conversion module is a bidirectional DC / DC converter.

5. The UPS system of any one of claims 1 to 4, wherein, The UPS system further comprises a second power conversion module and a third power conversion module; the second power conversion module is connected between the first bus and the DC input terminal of the first inverter circuit, and the second power conversion module is configured to perform DC / DC conversion on the current output by the first bus and input the current to the DC input terminal of the first inverter circuit; the first inverter circuit is configured to perform DC / AC conversion on the current output by the second power conversion module and supply power to the load; the third power conversion module is connected between the second bus and the DC input terminal of the second inverter circuit, and the third power conversion module is configured to perform DC / DC conversion on the current output by the second bus and input the current to the DC input terminal of the second inverter circuit; the second inverter circuit is configured to perform DC / AC conversion on the current output by the third power conversion module and supply power to the load.

6. The UPS system of claim 1, wherein, The UPS system further comprises an overcurrent protection module configured to disconnect a path between the first power conversion module and the corresponding battery group.

7. The UPS system of claim 1 or 6, wherein, The UPS system further comprises an overcurrent protection module configured to disconnect a path between the first bus and the first power conversion module.

8. The UPS system of claim 7, wherein, The UPS system further comprises an overcurrent protection module configured to disconnect a path between the second bus and the first power conversion module.

9. The UPS system of claim 1 or 6, wherein, The UPS system also includes an overcurrent protection module for opening a path between the first bus and the first inverter circuit.

10. The UPS system of claim 9, wherein, The UPS system also includes an overcurrent protection module for opening a path between the second bus and the second inverter circuit.

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