Data center power supply system and direct current conversion unit

Abstract

The embodiment of the invention provides a data center power supply system and a direct current conversion unit, the data center power supply system comprises the direct current conversion unit and a power supply unit, the direct current conversion unit comprises N direct current conversion circuits which are connected in parallel, the input ends of the direct current conversion circuits are used for being coupled to an alternating current power supply and a storage battery, the output end is coupled to the first bus, and when the alternating-current power supply supplies power, the alternating-current power supply outputs first voltage to the first bus through the direct-current conversion unit and charges the storage battery; when the AC power supply stops supplying power, the storage battery outputs a first voltage to the first bus through the DC conversion unit; wherein the total power of at most N-1 direct current conversion circuits meets the nominal power of the direct current conversion unit, and N is a positive integer not less than 2; the power supply unit is used for converting the first voltage into a second voltage suitable for supplying power to the data center load, the input end is coupled to the first bus, and the output end is coupled to the data center load.

Description

Technical Field

[0001] The present disclosure relates to the technical field of power supplies, including but not limited to data center power supply systems and DC conversion units. Background Art

[0002] With the rapid development of information technology, data centers, as the core infrastructure for data storage, processing, and transmission, are increasing in scale and quantity. The stable operation of data centers is crucial for ensuring the continuity of various information services. As a key component of data centers, the power supply system directly affects the reliability, efficiency, and sustainability of data centers. Reducing the cost of the power supply system while ensuring its reliability is one of the urgent problems to be solved. Summary of the Invention

[0003] In view of this, embodiments of the present disclosure provide a data center power supply system and a DC conversion circuit.

[0004] According to a first aspect of the present disclosure, there is provided a data center power supply system, including:

[0005] A DC conversion unit, including N DC conversion circuits connected in parallel. The input end of the DC conversion circuit is used to be coupled to an AC power supply and a battery, and the output end is coupled to a first bus. When the AC power supply is supplying power, the AC power supply outputs a first voltage to the first bus through the DC conversion unit and charges the battery. When the AC power supply stops supplying power, the battery outputs a first voltage to the first bus through the DC conversion unit. Among them, the total power of at most N - 1 DC conversion circuits meets the nominal power of the DC conversion unit, and N is a positive integer not less than 2;

[0006] A power supply unit, configured to convert the first voltage into a second voltage suitable for powering a data center load. Its input end is coupled to the first bus, and the output end is used to be coupled to the data center load.

[0007] In some embodiments, the DC conversion circuit includes: a front - stage hybrid circuit and a rear - stage DC circuit. The front - stage hybrid circuit and the rear - stage DC circuit are connected through a second bus, and the second buses of each DC conversion circuit are connected in parallel. The input end of the front - stage hybrid circuit serves as the input end of the DC conversion circuit, and the output end of the rear - stage DC circuit serves as the output end of the DC conversion circuit.

[0008] In some embodiments, each front - stage hybrid circuit includes: Y1 first rectifier branches and Y2 second rectifier branches;

[0009] The first rectifier branch, its first input terminal is used to be connected to any phase of the AC power supply via the first switch, its first input terminal is used to be connected to the positive or negative pole of the storage battery via the second switch, and its first output terminal, second output terminal and third output terminal are respectively connected to the positive DC bus, the neutral line and the negative DC bus;

[0010] The second rectifier branch, its first input terminal is used to be connected to the positive pole of the storage battery via the third switch, its second input terminal is used to be connected to the negative pole of the storage battery via the fourth switch, and its first output terminal, second output terminal and third output terminal are respectively connected to the positive DC bus, the neutral line and the negative DC bus.

[0011] In some embodiments, when the AC power supply is supplying power, the n DC conversion circuits are configured such that: the first switch, the third switch and the fourth switch are in the closed state, and the second switch is in the open state, so that the AC power supply outputs the first voltage to the first bus through the DC conversion unit and charges the storage battery, where n ≤ N.

[0012] In some embodiments, when the AC power supply stops supplying power, the n DC conversion circuits are configured such that: the second switch, the third switch and the fourth switch are in the closed state; the first switch is in the open state, so that the storage battery outputs the first voltage to the first bus through the DC conversion unit, where n ≤ N.

[0013] In some embodiments, each of the pre-stage hybrid circuits includes: Y1 first rectifier branches and Y2 second rectifier branches;

[0014] The first rectifier branch, its first input terminal is respectively used to be connected to any phase of the AC power supply via the first switch, its first input terminal is used to be connected to the positive pole of the storage battery via the fifth switch, its first input terminal is used to be connected to the negative pole of the storage battery via the seventh switch, its second input terminal is used to be connected to the negative pole of the storage battery via the sixth switch, and its first output terminal, second output terminal and third output terminal are respectively connected to the positive DC bus, the neutral line and the negative DC bus;

[0015] The second rectifier branch, its first input terminal is connected to the positive pole of the storage battery via the third switch, its second input terminal is connected to the negative pole of the storage battery via the fourth switch, its second input terminal is connected to the negative pole of the storage battery via the eighth switch, and its first output terminal, second output terminal and third output terminal are respectively connected to the positive DC bus, the neutral line and the negative DC bus.

[0016] In some embodiments, when the AC power supply stops supplying power, the n DC conversion circuits are configured such that: the third switch, the fourth switch, the fifth switch, and the sixth switch are in a closed state; the first switch, the seventh switch, and the eighth switch are in an open state, so that the storage battery outputs the first voltage to the first bus through the DC conversion circuit.

[0017] In some embodiments, when the AC power supply stops supplying power, the n DC conversion circuits are configured such that:

[0018] a of the fifth switches, a - b of the seventh switches, and b of the fourth switches are in a closed state, where a of the fifth switches and a - b of the seventh switches do not belong to the same first rectification branch, and a ≤ (Y1 + b) / 2, b ≤ Y2;

[0019] Other switches are in an open state, so that the storage battery outputs the first voltage to the first bus through the DC conversion unit;

[0020] Alternatively, a of the seventh switches, a - b of the fifth switches, and b of the third switches are in a closed state, where a of the seventh switches and a - b of the fifth switches do not belong to the same first rectification branch, and a ≤ (Y1 + b) / 2, b ≤ Y2;

[0021] Other switches are in an open state, so that the storage battery outputs the first voltage to the first bus through the DC conversion unit.

[0022] In some embodiments, the circuit structures of the first rectification branch and the second rectification branch are the same, and both include: an inductor, a first rectification switch, a second rectification switch, a first switching tube, and a second switching tube;

[0023] The first switching tube and the second switching tube are connected in series to form a bidirectional switch. The first rectification switch and the second rectification switch are connected in series. The common point of the first rectification switch and the second rectification switch is connected to the second end of the inductor and the first end of the bidirectional switch. The first end of the inductor serves as the first input end of the rectification branch. The free ends of the first rectification switch, the bidirectional switch, and the second rectification switch serve as the first output end, the second output end, and the third output end of the rectification branch respectively. The free end of the second rectification switch also serves as the second input end. According to a second aspect of the present disclosure, there is provided a DC conversion unit, including:

[0024] N DC conversion circuits connected in parallel, the input end of the DC conversion circuit is used to be coupled to an AC power supply and a storage battery, and the output end is coupled to a first bus; when the AC power supply supplies power, the AC power supply outputs a first voltage to the first bus through the DC conversion unit and charges the storage battery; when the AC power supply stops supplying power, the storage battery outputs the first voltage to the first bus through the DC conversion unit; wherein, the total power of at most N-1 of the DC conversion circuits meets the nominal power of the DC conversion unit.

[0025] In the data center power supply system provided by the embodiments of the present disclosure, the DC conversion unit includes N DC conversion circuits. Among them, the total power of at most N-1 DC conversion circuits meets the nominal power of the DC conversion unit, and the excess part of the total power can charge the storage battery. That is: when the AC power supply outputs the first voltage to the first bus through the DC conversion circuit, it can also charge the storage battery. In this way, there is no need to additionally set up a charging device to charge the storage battery, thereby reducing the equipment cost. Moreover, when the AC power supply stops supplying power, the storage battery outputs the first voltage to the first bus through the DC conversion circuit. Among them, the DC conversion circuit can narrow the voltage directly output by the storage battery to obtain the first voltage, so that the voltage transmitted on the first bus can meet the input requirements of the subsequent power supply unit. The power supply unit can directly convert the first voltage into a second voltage suitable for powering the data center load, which can simplify the circuit of the power supply unit, thereby improving the efficiency of the power supply unit and reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of a power supply system provided by an embodiment of the present disclosure;

[0027] Figure 2 It is a schematic diagram of another power supply system provided by an embodiment of the present disclosure;

[0028] Figure 3 It is a schematic diagram of yet another power supply system provided by an embodiment of the present disclosure;

[0029] Figure 4 It is a schematic diagram of still another power supply system provided by an embodiment of the present disclosure;

[0030] Figure 5 It is a schematic diagram of the pre-stage conversion circuit provided by an embodiment of the present disclosure Figure 1 ;

[0031] Figure 6 It is a schematic diagram of the pre-stage conversion circuit provided by an embodiment of the present disclosure Figure 2 ;

[0032] Figure 7 It is a schematic diagram of the rectification branch provided by an embodiment of the present disclosure;

[0033] Figure 8 Schematic diagrams of the first switching transistor and the second switching transistor provided by the embodiments of the present disclosure;

[0034] Figure 9 and Figure 10 Schematic diagram of the pre-stage conversion circuit provided by the embodiments of the present disclosure Figure 3 ;

[0035] Figures 11 to 13 Schematic diagram of the pre-stage conversion circuit provided by the embodiments of the present disclosure Figure 4 ;

[0036] Figure 14 Schematic diagram of the DC conversion unit provided by the embodiments of the present disclosure. Detailed implementation manners

[0037] To facilitate the understanding of the present disclosure, the exemplary embodiments of the present disclosure will be described in more detail below with reference to the relevant drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the specific implementation manners set forth herein. On the contrary, these implementation manners are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be completely conveyed to those skilled in the art.

[0038] Generally, the term "one or more" as used herein can be used to describe any feature, structure, or property in a singular sense or can be used to describe a combination of features, structures, or properties in a plural sense. Similarly, terms such as "a" or "the" can also be understood to convey a singular usage or a plural usage, at least in part depending on the context. The terms "comprising" and / or "including", when used in this specification, determine the presence of the described features, integers, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups. As used herein, the term "and / or" includes any and all combinations of the related listed items.

[0039] To thoroughly understand the present disclosure, detailed steps and detailed structures will be presented in the following description to explain the technical solutions of the present disclosure. The preferred embodiments of the present disclosure are described in detail below. However, in addition to these detailed descriptions, the present disclosure can also have other implementation manners.

[0040] Figure 1 Schematic diagram of a power supply system for a data center provided by the embodiments of the present disclosure. As Figure 1As shown in the figure, the data center power supply system includes a DC conversion unit 10 and a power supply unit (PSU) 40. Among them, the DC conversion unit 10 includes a plurality of parallel DC conversion circuits 20. The input end of the DC conversion circuit 20 is coupled to the commercial power, and its output end is coupled to the bus. The battery 30 is connected in parallel at the output end of the DC conversion circuit 20. Usually, the nominal voltage at the output end of the DC conversion unit 10 is 240V DC. However, since the battery 30 is connected in parallel at the output end of the DC conversion circuit 20, the output voltage range of the DC conversion unit 10 becomes 200V - 288V, which is wider than the nominal voltage.

[0041] The power supply unit 40 is located between the DC conversion unit 10 and the data center load 50. The power supply unit 40 is used to convert the low-voltage power output by the DC conversion unit 10 into a power suitable for the data center load 50. For example, it is converted into a 12V DC power suitable for a server. In some embodiments, in order for the power supply unit 40 to provide a safe isolation and precisely regulated output voltage, a DC-DC isolated half-bridge LLC (resonant converter) 42 is used to provide precise voltage conversion. However, an overly wide input voltage range of the LLC 42 will affect the output voltage accuracy. Therefore, a voltage converter 41 (for example, an AC-DC bridgeless totem-pole converter) needs to be added before the LLC 42 to adapt to the relatively wide output voltage of the DC conversion unit 10. Adding a voltage converter 41 in the power supply unit 40 will reduce the efficiency of the power supply unit and increase the cost.

[0042] In view of this, the embodiments of the present disclosure provide another data center power supply system. Figure 2 It is a schematic diagram of another data center power supply system provided by the embodiments of the present disclosure. As Figure 2 shown, the data center power supply system 100 includes:

[0043] A DC conversion unit 200, including N parallel-connected DC conversion circuits 210. The input end of the DC conversion circuit 210 is used to be coupled to an AC power source and a battery 300, and the output end of the DC conversion circuit 210 is coupled to a first bus 510. Among them, when the AC power source supplies power, the AC power source outputs a first voltage to the first bus 510 through the DC conversion unit 200 and charges the battery 300. When the AC power source stops supplying power, the battery 300 outputs a first voltage to the first bus 510 through the DC conversion unit 200. Among them, the total power of at most N - 1 DC conversion circuits 210 meets the nominal power of the DC conversion unit 200, and N is a positive integer not less than 2;

[0044] A power supply unit 400 is configured to convert a first voltage into a second voltage suitable for powering a data center load. The input terminal of the power supply unit 400 is coupled to a first bus 510, and the output terminal of the power supply unit 400 is configured to be coupled to the data center load.

[0045] In an embodiment of the present disclosure, the AC power supply may be a municipal power grid, simply referred to as the city grid. The alternating current output by the AC power supply is three-phase alternating current.

[0046] The battery 300 is coupled to the input terminal of the DC conversion circuit 210, which means that both the positive and negative electrodes of the battery 300 are coupled to the input terminal of the DC conversion circuit 210. The number of batteries 300 may be one or more. When there are multiple batteries 300, the multiple batteries 300 are connected in parallel.

[0047] The DC conversion unit 200 includes N DC conversion circuits 210 connected in parallel. Among them, the total power of at most N - 1 DC conversion circuits 210 meets the nominal power of the DC conversion unit 200. It should be noted that the nominal power refers to the power required by the rated load during normal operation. For a system that requires redundancy, the nominal power does not include the power of the redundant module.

[0048] Here, the situation where the total power of at most N - 1 DC conversion circuits 210 meets the nominal power of the DC conversion unit 200 includes that the total power of N - 1 DC conversion circuits 210 meets the nominal power of the DC conversion unit 200, or the total power of less than N - 1 (such as N - 2, N - 3, etc.) DC conversion circuits 210 meets the nominal power of the DC conversion unit 200.

[0049] Taking the case where the total power of N - 1 DC conversion circuits 210 meets the nominal power of the DC conversion unit 200 as an example, it means that the total power output when N - 1 DC conversion circuits 210 are working is greater than the nominal power of the DC conversion unit 200 to meet the power consumption requirements of the data center load. And the extra part of the total power can be used to charge the battery 300. In this way, there is no need to separately set up a charging device to charge the battery, which can save the overall cost of the data center supply system.

[0050] In some embodiments, the DC conversion unit 200 includes a primary DC conversion circuit and a redundant DC conversion circuit. One of the functions of the redundant DC conversion circuit is to improve the reliability of the data center power supply system. For example, when a certain primary DC conversion circuit fails, the redundant DC conversion circuit can be enabled to replace the faulty primary DC conversion circuit to continue powering the data center load, thereby ensuring uninterrupted power supply to the data center load, improving the reliability of the data center power supply system and meeting industry standards.

[0051] In the embodiments of the present disclosure, N-1 or N-2 etc. DC conversion circuits in the working state include a primary DC conversion circuit and a redundant DC conversion circuit, which improves the reuse rate of the redundant DC conversion circuit. In addition, a partial number of redundant DC conversion circuits are allowed to be in an idle state (i.e., not working) or in other modes to replace some of the N-1 or N-2 etc. DC conversion circuits in the working state when a failure occurs.

[0052] In some embodiments, the DC conversion unit 200 may adopt a P+1 redundant configuration, that is, it includes P primary DC conversion circuits, and when P is less than or equal to a specific number, for example, when P≤10, 1 redundant DC conversion circuit is configured; when P is greater than the specific number, for example, when P>10, 1 redundant DC conversion circuit is configured for every 10. In other embodiments, the DC conversion unit 200 may also adopt other redundant configuration methods, and the present disclosure does not limit this.

[0053] In addition, it should be noted that the primary DC conversion circuit and the redundant DC conversion circuit have the same circuit structure, and each of the N DC conversion circuits 210 can be used as the primary or the redundant. That is, a certain DC conversion circuit is not fixedly used as the primary or the redundant, but a part can be selected from the N DC conversion circuits 210 as the primary, and the other part as the redundant.

[0054] Continuing to refer to Figure 2 , the power supply unit 400 includes a DC-DC converter 410. The input end of the DC-DC converter 410 is directly connected to the first bus 510, and the output end is connected to the data center load. Exemplarily, the DC-DC converter 410 can be Figure 1 the DC-DC isolated half-bridge LLC (resonant converter) in

[0055] In the data center power supply system provided by the embodiments of the present disclosure, when a power failure occurs due to abnormal mains power supply or other situations, the control battery 300 discharges. Due to the influence of the battery's own performance and the environment, the voltage directly output by the battery 300 may fluctuate within a large range. In this embodiment, the battery 300 is coupled to the input end of the DC conversion circuit 210, so that the current output by the battery 300 passes through the DC conversion circuit 210 and then is output to the first bus 510. The DC conversion circuit 210 can rectify the voltage directly output by the battery 300 into a first voltage, thereby narrowing the voltage range transmitted on the first bus 510, so that the voltage transmitted on the first bus 510 can meet the input requirements of the subsequent power supply unit 400. The power supply unit 400 may only include a single-stage DC-DC converter (for example, Figure 1In the LLC 42), the first voltage can be converted into a second voltage suitable for powering the data center load, without having to add another stage of voltage converter as shown in Figure 1 (for example, the voltage converter 41 in Figure 1 ). That is, the power supply unit 400 in this embodiment can reduce one stage of voltage conversion, thereby improving efficiency and reducing costs.

[0056] Figure 3 FIG. is a schematic diagram of another data center power supply system provided by an embodiment of the present disclosure. In some embodiments, as shown in Figure 3 , each DC conversion circuit 210 includes: a pre-stage hybrid circuit 211 and a post-stage DC circuit 212. The output end of the pre-stage hybrid circuit 211 is connected to the input end of the post-stage DC circuit 212. The input end of the pre-stage hybrid circuit 211 serves as the input end of the DC conversion circuit 210, and the output end of the post-stage DC circuit 212 serves as the output end of the DC conversion circuit 210.

[0057] Exemplarily, the post-stage DC circuit 212 can be a bidirectional DC-DC converter, for example, a bidirectional resonant converter (LLC). When powered by an AC power supply, the bidirectional DC-DC converter can convert the voltage output by the pre-stage hybrid circuit 211 into a first voltage and output it to the first bus 510.

[0058] For the storage battery 300, as shown in Figure 3 , its charging circuit can be understood as follows: starting from an AC power supply (for example, the mains), it sequentially passes through the pre-stage hybrid circuit 211 and the post-stage DC circuit 212 of a DC conversion circuit, the first bus 510, the post-stage DC circuit 212 and the pre-stage hybrid circuit 211 of another DC conversion circuit, and finally reaches the storage battery 300.

[0059] Figure 4 FIG. is a schematic diagram of yet another data center power supply system provided by an embodiment of the present disclosure. In some embodiments, as shown in Figure 4 , each DC conversion circuit 210 includes: a pre-stage hybrid circuit 211 and a post-stage DC circuit 212. The pre-stage hybrid circuit 211 and the post-stage DC circuit 212 are connected through a second bus 520, and the second buses 520 of each DC conversion circuit 210 are connected in parallel; wherein, the input end of the pre-stage hybrid circuit 211 serves as the input end of the DC conversion circuit 210, and the output end of the post-stage DC circuit 212 serves as the output end of the DC conversion circuit 210.

[0060] The first end of the second bus 520 is connected to the output end of the pre-stage hybrid circuit 211, and the second end is connected to the input end of the post-stage DC circuit 212. Moreover, the second ends of multiple second buses 520 are connected to each other, so that multiple pre-stage hybrid circuits 211 are connected in parallel. Specifically, the second ends of all the second buses 520 in the N DC conversion circuits 210 are connected to each other, so that the N pre-stage hybrid circuits 211 are connected in parallel.

[0061] Figure 4 The difference from Figure 3 is that the second ends of multiple second buses 520 are connected to each other, so that multiple pre-stage hybrid circuits 211 are directly connected in parallel. For the storage battery 300, as Figure 4 shown, its charging circuit can be understood as follows: starting from an AC power supply (for example, mains power), it passes through a pre-stage hybrid circuit 211, a second bus 520, another pre-stage hybrid circuit 211 in sequence, and finally reaches the storage battery 300. Compared with the charging circuit in the embodiment of Figure 3 , the charging circuit in this embodiment is shorter and can improve the charging efficiency more. And Figure 4 in the embodiment of

[0062] , the second bus 520 can parallelize multiple pre-stage hybrid circuits 211 to achieve forced balancing between the DC conversion circuits 210 and improve the current sharing effect of multiple parallel DC conversion circuits 210.

[0062] It should be noted that in the embodiments shown in Figure 3 and Figure 4 , the DC conversion circuit 210 includes a pre-stage hybrid circuit 211 and a post-stage DC circuit 212. In other embodiments, the DC conversion circuit 210 may not include the post-stage DC circuit 212, that is, the pre-stage hybrid circuit 211 is directly connected to the first bus 510. Whether to set the post-stage DC circuit 212 in the DC conversion circuit 210 is related to the matching degree between the output voltage of the pre-stage hybrid circuit 211 and the input voltage required by the power supply unit 400. In practical applications, whether to set the post-stage DC circuit 212 can be determined according to needs.

[0063] Figure 5 is a schematic diagram of the pre-stage hybrid circuit provided by the embodiment of the present disclosure Figure 1 . In some embodiments, as Figure 5As shown, each pre-stage hybrid circuit 211 includes: Y1 first rectifier branches and Y2 second rectifier branches; the first input terminal of each first rectifier branch is used to connect to any phase of the AC power supply via the first switch K1. Among them, the first input terminal of at least one first rectifier branch is also used to connect to the positive pole BAT+ or the negative pole BAT- of the storage battery 300 via the second switch K2. The first output terminal, the second output terminal, and the third output terminal of the first rectifier branch are respectively connected to the positive DC bus Bus+, the neutral line O, and the negative DC bus Bus-; the first input terminal of the second rectifier branch is used to connect to the positive pole BAT+ of the storage battery 300 via the third switch K3, the second input terminal of the second rectifier branch is used to connect to the negative pole BAT- of the storage battery 300 via the fourth switch K4, and the first output terminal, the second output terminal, and the third output terminal of the second rectifier branch are respectively connected to the positive DC bus Bus+, the neutral line O, and the negative DC bus Bus-.

[0064] Exemplarily, as Figure 5 shown, the first input terminal of each first rectifier branch is used to connect to the positive pole BAT+ or the negative pole BAT- of the storage battery 300 via the second switch K2.

[0065] Exemplarily, the number Y1 of the first rectifier branches is 3, and the number Y2 of the second rectifier branches is 1. That is: the pre-stage hybrid circuit 211 includes three first rectifier branches and one second rectifier branch, among which, the three first rectifier branches are respectively connected to the first phase, the second phase, and the third phase of the AC power supply.

[0066] Exemplarily, each of the first switch K1, the second switch K2, the third switch K3, and the fourth switch K4 can be a thyristor. In addition, the positive DC bus Bus+ and the negative DC bus Bus- can be the second bus 520 or the first bus 510.

[0067] In some embodiments, when the AC power supply is supplying power, the n DC conversion circuits 210 are configured such that: the first switch K1, the third switch K3, and the fourth switch K4 are in the closed state, and the second switch K2 is in the open state, so that the AC power supply outputs a first voltage to the first bus 510 through the DC conversion circuit 210 and charges the storage battery 300, where n ≤ N.

[0068] Refer to Figure 5, when powered by an AC power supply, the first switch K1 in the first rectification branch is in the closed state, so that one phase of the AC power supply is rectified through the first rectification branch to obtain direct current. For example, the number Y1 of the first rectification branches is 3. The first switches K1 in the three first rectification branches are all in the closed state, so that the first phase A, the second phase B, and the third phase C of the AC power supply are rectified through the first rectification branch, the second rectification branch, and the third rectification branch respectively. At the same time, the second switch K2 in the first rectification branch is in the open state.

[0069] When powered by an AC power supply, the third switch K3 and the fourth switch K4 are both in the closed state, so that the positive electrode BAT+ and the negative electrode BAT- of the storage battery are both connected to the second rectification branch, and the positive DC bus Bar+ provides current for the positive electrode of the storage battery, and the current returns from the negative electrode of the storage battery to the negative DC bus Bar-. In short, when powered by an AC power supply, the DC conversion circuit 210 is in the mode of charging on Y2 paths and discharging on Y1 paths, that is, the second rectification branch is charging and the first rectification branch is discharging.

[0070] In some embodiments, n ≤ N - 1, that is: some of the N - 1 DC conversion circuits can supply power to the storage battery 300. Of course, it is also allowed that all N - 1 DC conversion circuits 210 are in the mode of charging on Y2 paths and discharging on Y1 paths.

[0071] In some embodiments, when the AC power supply stops supplying power, the n DC conversion circuits 210 are configured as follows: the second switch K2 and the third switch K3 are in the closed state; the first switch K1 and the fourth switch K4 are in the open state, so that the storage battery outputs a first voltage to the first bus 510 through the DC conversion circuit 210, where n ≤ N.

[0072] For example, among the Y1 first rectification branches, the first input ends of c first rectification branches are coupled to the negative electrode BAT- of the storage battery, and the first input ends of c - Y2 first rectification branches are coupled to the positive electrode BAT+ of the storage battery, and c = (Y1 + Y2) / 2.

[0073] Reference Figure 5 , when the AC power supply stops supplying power, the second switch K2 in the Y1 first rectification branches is in the closed state, and the third switch K3 in the Y2 second rectification branches is in the closed state, so that c discharge paths of the storage battery can be formed, and the DC conversion circuit 210 is in the c-path discharge rectification mode. For example, if the number Y1 of the first rectification branches is 3 and the number Y2 of the second rectification branches is 1, then two parallel discharge paths can be formed, and the DC conversion circuit 210 is in the two-path discharge rectification mode. At this time, the first switch K1 in the first rectification branch and the fourth switch K4 in the second rectification branch are in the open state.

[0074] Continue to refer toFigure 5 , in another embodiment, when the AC power supply stops supplying power, the n DC conversion circuits 210 can also be configured such that the third switch K3 and the fourth switch K4 are in the closed state; the first switch K1 and the second switch K2 are in the open state, so that the storage battery outputs a first voltage to the first bus 510 through the DC conversion circuit 210, where n ≤ N - 1.

[0075] That is: the third switch K3 and the fourth switch K4 in the Y2 second rectifier branches are in the closed state, so that the storage battery discharges through Y2 paths, and the DC conversion circuit 210 is in the Y2-path discharge rectification mode. And the first switch K1 and the second switch K2 in the first rectifier branch are in the open state and do not participate in the discharge and rectification of the storage battery.

[0076] In some embodiments, n ≤ N - 1, that is, the storage batteries 300 coupled to some of the N - 1 DC conversion circuits can supply power to the data center load. Of course, it is also allowed that the storage batteries 300 coupled to all N - 1 DC conversion circuits 210 supply power to the data center load.

[0077] In summary, in the present disclosure Figure 5 In the embodiments shown, by controlling the switches in the first rectifier branch and the second rectifier branch of the pre-stage hybrid circuit 211, when the AC power supply is normal, the DC conversion circuit 210 is in the multi-path charging and multi-path discharging mode, and when the AC power supply is interrupted, the DC conversion circuit 210 is in the c-path discharge rectification mode or the Y2-path discharge rectification mode.

[0078] Figure 6 Schematic diagram of the pre-stage hybrid circuit provided by the embodiments of the present disclosure Figure 2 . In some embodiments, as Figure 6 shown, each pre-stage hybrid circuit 211 includes: Y1 first rectifier branches and Y2 second rectifier branches; wherein, the first input end of the first rectifier branch is respectively used to connect to any phase of the AC power supply via the first switch K1, and the first input end of the first rectifier branch is also used to connect to the positive electrode BAT+ of the storage battery via the fifth switch K5, the second input end of the first rectifier branch is connected to the negative electrode BAT- of the storage battery via the sixth switch K6, and its first output end, second output end and third output end are respectively connected to the positive DC bus Bus+, the neutral line O and the negative DC bus Bus-; the first input end of the second rectifier branch is connected to the positive electrode BAT+ of the storage battery via the third switch K3, the second input end of the second rectifier branch is connected to the negative electrode BAT- of the storage battery via the fourth switch K4, and its first output end, second output end and third output end are respectively connected to the positive DC bus Bus+, the neutral line O and the negative DC bus Bus-.

[0079] Exemplarily, the number Y1 of the first rectification branches is 3, and the number Y2 of the second rectification branches is 1. That is, the pre-stage hybrid circuit 211 includes three first rectification branches and one second rectification branch. Among them, the three first rectification branches are respectively connected to the first phase, the second phase, and the third phase of the AC power supply.

[0080] Exemplarily, each of the first switch K1, the third switch K3 to the eighth switch K8 can be a thyristor. In addition, the positive DC bus Bar+ and the negative DC bus Bar- can be the second bus 520 or the first bus 510.

[0081] In some embodiments, when the AC power supply is supplying power, the n DC conversion circuits 210 are configured such that: the first switch K1, the third switch K3, and the fourth switch K4 are in the closed state; the fifth switch K5 and the sixth switch K6 are in the open state, so that the AC power supply outputs a first voltage to the first bus 510 through the DC conversion circuit 210 and charges the battery 300, where n ≤ N. Exemplarily, n ≤ N - 1. Refer to Figure 6 , when the AC power supply is supplying power, the first switch K1 in the Y1 first rectification branches is in the closed state, so that the multi-phase of the AC power supply is rectified through the first rectification branch to obtain direct current. The third switch K3 and the fourth switch K4 in the second rectification branch are both in the closed state, so that the positive electrode BAT+ and the negative electrode BAT- of the battery are both connected to the second rectification branch. The positive DC bus Bar+ inputs current starting from the positive electrode of the battery, and the current returns from the negative electrode of the battery 300 to the negative DC bus Bar- to charge the battery 300.

[0082] In addition, when the AC power supply is normal, the fifth switch K5 and the sixth switch K6 in the first rectification branch are in the open state. In addition, if the first input end of the first rectification branch is also used to connect to the negative electrode BAT- of the battery via the seventh switch K7, and the first input end of the second rectification branch is also connected to the negative electrode BAT- of the battery via the eighth switch K8, then at this time both the seventh switch K7 and the eighth switch K8 are in the open state. In general, when the AC power supply is supplying power, according to the switch setting scheme of this embodiment, the DC conversion circuit 210 is in the mode of charging in Y2 paths and discharging in Y1 paths.

[0083] In some embodiments, when the AC power supply stops supplying power, the n DC conversion circuits are configured such that: the third switch K3, the fourth switch K4, the fifth switch K5, and the sixth switch K6 are in the closed state; the first switch K1 is in the open state, so that the battery 300 outputs a first voltage to the first bus 510 through the DC conversion circuit 210.

[0084] Continue to refer to Figure 6, when the AC power supply stops supplying power, the fifth switch K5 and the sixth switch K6 in the Y1 first rectifier branches are in the closed state, forming Y1 parallel discharge paths. The third switch K3 and the fourth switch K4 in the Y2 second rectifier branches are in the closed state, forming Y2 parallel discharge paths, thus forming a total of Y1 + Y2 discharge paths for the storage battery, and the DC conversion circuit 210 is in the Y1 + Y2 path discharge rectification mode. At this time, the first switch K1 in the first rectifier branch is in the open state. If the pre-stage hybrid circuit 211 further includes a seventh switch K7 and an eighth switch K8, at this time, the seventh switch K7 and the eighth switch K8 are in the open state.

[0085] It should be noted that Figure 6 each rectifier branch in is coupled to the positive and negative electrodes of the same storage battery 300 to form a complete discharge path of the storage battery 300 in each rectifier branch.

[0086] In some embodiments, as Figure 6 shown, the pre-stage hybrid circuit 211 further includes a seventh switch K7 and an eighth switch K8; when the AC power supply stops supplying power, the n DC conversion circuits are configured as:

[0087] a fifth switches, a - b seventh switches, and b eighth switches are in the closed state, where the a fifth switches and the a - b seventh switches do not belong to the same first rectifier branch, and a ≤ (Y1 + b) / 2, b ≤ Y2; other switches are in the open state, so that the storage battery outputs a first voltage to the first bus through the DC conversion unit;

[0088] Alternatively, a seventh switches, a - b fifth switches, and b third switches are in the closed state, where the a seventh switches and the a - b fifth switches do not belong to the same first rectifier branch, and a ≤ (Y1 + b) / 2, b ≤ Y2; other switches are in the open state, so that the storage battery outputs a first voltage to the first bus through the DC conversion unit.

[0089] Continuing to refer to Figure 6 , when the AC power supply stops supplying power, if among the Y1 first rectifier branches, a fifth switches K5 are in the closed state, a - b seventh switches K7 are in the closed state, and b eighth switches K8 in the second rectifier branch are in the closed state, a discharge paths can be formed; and, among the a - b discharge paths, the current of the positive electrode BAT+ of the storage battery flows into the positive DC bus Bus+ through the fifth switch K5 and the corresponding first rectifier branch, and then returns to the negative electrode BAT- of the storage battery from other first rectifier branches and the corresponding seventh switch K7; among the b discharge paths, the current of the positive electrode BAT+ of the storage battery flows into the positive DC bus Bus+ through the fifth switch K5 and the corresponding first rectifier branch, and then returns to the negative electrode BAT- of the storage battery from the second rectifier branch and the eighth switch K8.

[0090] In addition, the other Y1 - a fifth switches K5, the Y1 - (a - b) seventh switches K7, all the first switches K1, sixth switches K6, fourth switches K4, and third switches K3, and the other Y2 - b eighth switches K8 are in an open state. In some embodiments, b is equal to Y2, and a is equal to (Y1 + Y2) / 2.

[0091] If among the Y1 first rectifying branches, a seventh switches K7 are in a closed state, a - b fifth switches K5 are in a closed state, and b third switches K3 in the Y2 second rectifying branches are in a closed state, a discharge paths can also be formed; and, among the a - b discharge paths, the current of the positive electrode BAT+ of the storage battery flows into the positive DC bus Bar+ through the fifth switch K5 and the corresponding first rectifying branch, and then returns to the negative electrode BAT - of the storage battery from the other first rectifying branches and the corresponding seventh switches K7; among the b discharge paths, the current of the positive electrode BAT+ of the storage battery flows into the positive DC bus Bar+ through the third switch K3 and the second rectifying branch, and then returns to the negative electrode BAT - of the storage battery from the other first rectifying branches and seventh switches K7. That is, when the AC power supply stops supplying power, the DC conversion circuit 210 can also be in an a - path discharge rectification mode.

[0092] In addition, the other Y1 - a seventh switches K7, the Y1 - (a - b) fifth switches K5, all the first switches K1, sixth switches K6, fourth switches K4, and eighth switches K8, and the other Y2 - b third switches K3 are in an open state. In some embodiments, b is equal to Y2, and a is equal to (Y1 + Y2) / 2.

[0093] In summary, in the present disclosure Figure 6 In the illustrated embodiment, by controlling the switches in the first rectifying branch and the second rectifying branch of the front - stage hybrid circuit 211, when the AC power supply is normal, the DC conversion circuit 210 is in a multi - path charging and multi - path discharging mode, and when the AC power supply is interrupted, the DC conversion circuit 210 is in a Y1 + Y2 - path discharge rectification mode or in an a - path discharge rectification mode.

[0094] In the embodiments of the present disclosure, Y2 second rectifying branches are added outside the Y1 first rectifying branches to charge the storage battery when the AC power supply is normal. It can be understood that it is not a specific redundant DC conversion circuit that charges the storage battery, but the redundant power in the total power output by the working DC conversion circuit except for the nominal power provided for the data center load that charges the storage battery.

[0095] In some embodiments, the circuit structures of the second rectifying branch and the first rectifying branch are the same. By designing each rectifying branch into exactly the same circuit structure, they can be replaced with each other, which is more convenient for the wiring of the front-stage hybrid circuit with the AC power supply or the battery in practical applications. When wiring, there is no need to distinguish each rectifying branch. Only any Y1 rectifying branches need to be connected to the AC power supply and the battery, and the remaining Y2 rectifying branches only need to be connected to the battery.

[0096] Figure 7 FIG. shows a schematic diagram of a rectifying branch. As Figure 7 shown, in some embodiments, each rectifying branch includes: an inductor L, a first rectifying switch S1, a second rectifying switch S2, a first switching tube M1, and a second switching tube M2; wherein, the first switching tube M1 and the second switching tube M2 are connected in series to form a bidirectional switch, the first rectifying switch S1 and the second rectifying switch S2 are connected in series, the common point of the first rectifying switch S1 and the second rectifying switch S2 is connected to the second end of the inductor L and the first end of the bidirectional switch, the first end of the inductor L is used as the first input end of the rectifying branch, and the free ends of the first rectifying switch S1, the bidirectional switch, and the second rectifying switch S2 are respectively used as the first output end, the second output end, and the third output end of the rectifying branch. The free end of the second rectifying switch S2 is also used as the second input end.

[0097] Exemplarily, the first rectifying switch S1 or the second rectifying switch S2 may include a diode, a MOS transistor (Metal Oxide Semiconductor Field Effect Transistor, MOSFET), or a triode. Exemplarily, the first switching tube M1 or the second switching tube M2 may include a MOS transistor. For example Figure 8 shown, the first switching tube M1 and the second switching tube M2 may be MOS transistors with parallel diodes. Alternatively, the first switching tube M1 and the second switching tube M2 may be composed only of MOS transistors.

[0098] The present disclosure Figure 7 only provides an example of the rectifying branch. In other embodiments, the rectifying branch may also have other circuit structures, and the present disclosure does not limit this.

[0099] In some embodiments, as Figure 5 and Figure 6As shown in the figure, the pre-stage hybrid circuit 211 may further include: a first bus capacitor C10 and a second bus capacitor C20. The first bus capacitor C10 and the second bus capacitor C20 are connected in series. The common point of the first bus capacitor C10 and the second bus capacitor C20 is connected to the free end of the bidirectional switch. The free end of the first bus capacitor C10 is connected to the free end of the first rectifier switch S1, and the free end of the second bus capacitor C20 is connected to the free end of the second rectifier switch S2.

[0100] The first bus capacitor C10 may include a plurality of capacitors connected in parallel, and the second bus capacitor C20 may include a plurality of capacitors connected in parallel. In the following text Figures 9 to 13 each first capacitor C1 in each rectifier branch is a partial capacitor in the first bus capacitor C10, and the second capacitor C2 is a partial capacitor in the second bus capacitor.

[0101] The pre-stage hybrid circuit 211 provided by the present disclosure will be described in detail below in conjunction with several specific embodiments.

[0102] Figure 9 is a schematic diagram of the pre-stage hybrid circuit provided by the embodiments of the present disclosure Figure 3 . As Figure 9 shown, in the first first rectifier branch, the first end of the inductor L1 is connected to the first phase A of the AC power supply via the first switch K11 and to the positive electrode BAT+ of the battery via the second switch K21; in the second first rectifier branch, the first end of the inductor L2 is connected to the second phase B of the AC power supply via the first switch K12 and to the negative electrode BAT- of the battery via the second switch K22; in the third first rectifier branch, the first end of the inductor L3 is connected to the third phase C of the AC power supply via the first switch K13 and to the negative electrode BAT- of the battery via the second switch K23. In the second rectifier branch, the first end of the inductor L4 is connected to the positive electrode BAT+ of the battery via the third switch K3, and the free end of the second rectifier switch S2 is connected to the negative electrode BAT- of the battery via the fourth switch K4.

[0103] It should be noted that Figure 9 the two rectifier branches used to form the battery discharge path should be connected to the same battery 300. For example, the first first rectifier branch and the second first rectifier branch are connected to the same battery 300, and the third first rectifier branch and the second rectifier branch are connected to the same battery 300.

[0104] In Figure 9In the illustrated embodiment, the first rectifying switch S1 includes a diode D1 and a ninth switch K9 connected in parallel with the diode D1, and the second rectifying switch S2 is a diode. The cathode of the diode in the first rectifying switch is the free end of the first rectifying switch, and the anode of the diode in the second rectifying switch is the free end of the second rectifying switch. By way of example, the diode D1 and the ninth switch K9 can be replaced with Figure 8 the switching tubes shown.

[0105] By way of example, the four inductors L1, L2, L3, and L4 are equal-value inductors, which play the roles of filtering, storing, and transmitting energy. Both the first rectifying switch S1 and the second rectifying switch S2 include diodes that play a clamping role. C1 and C2 are two equal-value capacitors, which play the role of filtering out the output voltage ripple, thereby obtaining a stable direct current; the bidirectional switch controls the on and off of the switch in each cycle, so that the system operates at a unity power factor while stably outputting direct current. Figure 9 The illustrated front-stage hybrid circuit 211 uses six three-phase diodes for rectification, which can improve the circuit efficiency, simplify the circuit design, and has the advantage of high output voltage stability.

[0106] Referring to Figure 9 , when powered by an AC power supply, the front-stage hybrid circuit 211 is in a mode of charging one path and rectifying three paths. Among them, the first switches K11, K12, and K13 in the three first rectifying branches are in the closed state to rectify the three-phase alternating current to obtain direct current. At this time, the second switches K12, K22, and K23 are in the open state. By way of example, the ninth switch K9 in the first rectifying branch is in the open state, and the bidirectional switch in the first rectifying branch can be controlled according to the current direction and the like.

[0107] In the second rectifying branch, the third switch K3 and the fourth switch K4 are in the closed state, and the ninth switch K9 is in the closed state. As shown by the thick line in Figure 9 , the current on the positive DC bus Bus+ flows through the ninth switch K9 and the third switch K3 to the positive electrode BAT+ of the battery, and then returns from the negative electrode BAT- of the battery through the fourth switch K4 to the negative DC bus Bus-, completing the charging of the battery.

[0108] Referring to Figure 10, when the AC power supply is abnormal, the pre-stage hybrid circuit is in a mode of two-way parallel discharge. Among them, the second switch K21 in the first first rectifier branch is in the closed state, so that the positive electrode BAT+ of the battery is connected to the positive DC bus Bus+, and the second switch K22 in the second first rectifier branch is in the closed state, so that the negative electrode BAT- of the battery is connected to the negative DC bus Bus-, forming the first discharge path of the battery. And, the second switch K23 in the third first rectifier branch is in the closed state, and the third switch K3 in the second rectifier branch is in the closed state, forming the second discharge path of the battery, so that the battery can discharge through two-way parallel. At this time, the first switches K11, K12, K13 in each first rectifier branch are in the open state, and the fourth switch K4 is in the open state. Exemplarily, each ninth switch K9 is in the open state. Exemplarily, the first switching tube M1 and the second switching tube M2 in the bidirectional switch are both in the closed state.

[0109] In some embodiments, when the AC power supply is abnormal, the pre-stage hybrid circuit can also be in a mode of single-way discharge. Among them, the first switches K11, K12, K13 and the second switches K21, K22, K23 in each first rectifier branch are all in the open state. In the second rectifier branch, the third switch K3 and the fourth switch K4 are in the closed state, so that the current of the positive electrode BAT+ of the battery flows to the positive DC bus Bus+ and returns to the negative electrode BAT- of the battery from the negative DC bus Bus-. Exemplarily, the ninth switch K9 in the second rectifier branch is in the open state.

[0110] Figure 11 Schematic diagram of the pre-stage hybrid circuit provided by the embodiments of the present disclosure Figure 4 . In some embodiments, such as Figure 11As shown, in the first first rectification branch, the first end of inductor L1 is connected to the first phase A of the AC power supply via the first switch K11, to the positive electrode BAT+ of the battery via the fifth switch K51, and to the negative electrode BAT- of the battery via the seventh switch K71. The free end of the second rectification switch S2 is connected to the negative electrode BAT- of the battery via the sixth switch K61. In the second first rectification branch, the first end of inductor L2 is connected to the second phase B of the AC power supply via the first switch K12, to the positive electrode BAT+ of the battery via the fifth switch K52, and to the negative electrode BAT- of the battery via the seventh switch K72. The free end of the second rectification switch S2 is connected to the negative electrode BAT- of the battery via the sixth switch K62. In the third first rectification branch, the first end of inductor L3 is connected to the third phase C of the AC power supply via the first switch K13, to the positive electrode BAT+ of the battery via the fifth switch K53, and to the negative electrode BAT- of the battery via the seventh switch K73. The free end of the second rectification switch S2 is connected to the negative electrode BAT- of the battery via the sixth switch K63. In the second rectification branch, the first end of inductor L4 is connected to the positive electrode BAT+ of the battery via the third switch K3 and to the negative electrode BAT- of the battery via the eighth switch K8. The free end of the second rectification switch S2 is connected to the negative electrode BAT- of the battery via the fourth switch K24.

[0111] In Figure 11 the illustrated embodiment, the first rectification switch S1 and the second rectification switch S2 may both be MOS transistors.

[0112] Referring Figure 11 , when powered by the AC power supply, the front-stage hybrid circuit is in a mode of one-way charging and three-way rectification. Among them, the first switches K11, K12, and K13 in the three first rectification branches are in the closed state to rectify the three-phase alternating current to obtain direct current. At this time, the fifth switches K51, K52, K53, the seventh switches K71, K72, K73, and the sixth switches K61, K62, K63 are in the open state. The first rectification switch S1, the second rectification switch S2, and the bidirectional switch in the first rectification branch can be controlled according to the current direction and the like.

[0113] In the second rectification branch, the third switch K3 and the fourth switch K4 are in the closed state, and the first rectification switch S1 is in the closed state. As Figure 9 shown by the thick line in, the current on the positive DC bus Bar+ flows through the first rectification switch and the third switch K3 to the positive electrode BAT+ of the battery, and then returns from the negative electrode BAT- of the battery through the fourth switch K4 to the negative DC bus Bar- to complete the charging of the battery. At this time, the eighth switch K8 is in the open state. Exemplarily, the second rectification switch S2 in the second rectification branch is in the open state.

[0114] Reference Figure 12 When the AC power supply is abnormal, the pre-stage hybrid circuit can be in the mode of four-way parallel discharge rectification. Among them, in the three first rectification branches, the fifth switches K51, K52, and K53 are in the closed state, and the first rectification switch S1 is in the closed state, so that the positive pole BAT+ of the storage battery is connected to the positive DC bus Bar+; the sixth switches K61, K62, and K63 are in the closed state, so that the negative pole BAT- of the storage battery is connected to the negative DC bus Bar-, forming three discharge paths of the storage battery. And, the third switch K3, the first rectification switch S1, and the fourth switch K4 in the second rectification branch are in the closed state, forming the fourth discharge path of the storage battery, so that the storage battery can discharge and rectify through four-way parallel connection. At this time, the first switches K11, K12, K13, the seventh switches K71, K72, K73, and the eighth switch K8 are in the open state. Exemplarily, the bidirectional switches in each rectification branch can be controlled according to the current direction and the like. Exemplarily, the second rectification switch S2 in each rectification branch is in the open state.

[0115] In some embodiments, when the AC power supply is abnormal, the pre-stage hybrid circuit 211 can also be in the mode of two-way parallel discharge rectification. Among them, in the first type of implementation, the fifth switches of any two of the three first rectification branches are in the closed state and the seventh switches are in the open state, the fifth switch of the remaining one first rectification branch is in the open state and the seventh switch is in the closed state, and the third switch K3 in the second rectification branch is in the open state and the eighth switch K8 is in the closed state. In the second type of implementation, the fifth switches of any two of the three first rectification branches are in the open state and the seventh switches are in the closed state, the fifth switch of the remaining one first rectification branch is in the closed state and the seventh switch is in the open state, and the third switch K3 in the second rectification branch is in the closed state and the eighth switch K8 is in the open state.

[0116] See Figure 13 Taking one specific implementation as an example for illustration, the fifth switches K51 and K53 in the first and third first rectification branches are in the closed state, and the first rectification switch S1 is in the closed state, so that the current of the positive pole BAT+ of the storage battery flows into the positive DC bus Bar+; while the first switches K11, K13, the seventh switches K71, K73, the sixth switches K61, K63, and the second rectification switch S2 are in the open state. Exemplarily, the bidirectional switches in the first and third first rectification branches can be controlled according to the current direction and the like.

[0117] The seventh switch K72 and the bidirectional switch in the second first rectifier branch are in the closed state, and the first switch K12, the fifth switch K52, the sixth switch K62, the first rectifier switch S1, and the second rectifier switch S2 are in the open state. In the second rectifier branch, the eighth switch K8 and the bidirectional switch are in the closed state, while the third switch K3, the fourth switch K4, the first rectifier switch S1, and the second rectifier switch S2 are in the open state. As Figure 13 shown, the first first rectifier branch and the second first rectifier branch form the first discharge path of the storage battery, and the third first rectifier branch and the second rectifier branch form the second discharge path of the storage battery, so that the front-stage hybrid circuit 211 can also be in the mode of two-way parallel discharge rectification. In other embodiments, it may also be that the seventh switch K72 and the second rectifier switch S2 in the second first rectifier branch are in the closed state and the bidirectional switch is in the open state; the eighth switch K8 and the second rectifier switch S2 in the second rectifier branch are in the closed state and the bidirectional switch is in the open state.

[0118] Compared with Figure 9 the front-stage hybrid circuit 211 shown, Figure 11 the front-stage hybrid circuit 211 shown can implement more modes, can provide more control strategies, and can more flexibly set different modes to supply power to the data center load.

[0119] The embodiment of the present disclosure also provides a DC conversion unit. As Figure 14 shown, the DC conversion unit 200 includes: N DC conversion circuits 210 connected in parallel. The input end of the DC conversion circuit 210 is used to be coupled to the AC power supply AC and the storage battery 300, and the output end is coupled to the first bus 510; wherein, when the AC power supply supplies power, the AC power supply outputs a first voltage to the first bus 510 through the DC conversion unit 200 and charges the storage battery 300; when the AC power supply stops supplying power, the storage battery 300 outputs a first voltage to the first bus 510 through the DC conversion unit 200; wherein, the total power of at most N - 1 DC conversion circuits 210 meets the nominal power of the DC conversion unit 200.

[0120] The DC conversion unit 200 provided in this embodiment can be the DC conversion unit 200 in any of the above embodiments and has the same technical effects, which will not be elaborated here.

[0121] The DC conversion unit provided by the embodiments of the present disclosure can charge the storage battery when powered by an AC power supply, eliminating the need for an additional charging device, thus reducing costs. On the other hand, when the AC power supply stops, the current output by the storage battery can be rectified by the DC conversion unit to narrow the voltage range to meet the input voltage requirements of the power supply unit. Therefore, only one stage of DC-DC converter needs to be provided in the power supply unit, simplifying the circuit of the power supply unit, improving the efficiency of the power supply unit and reducing costs.

[0122] It should be noted that the features disclosed in several method or device embodiments provided by the present disclosure can be arbitrarily combined without conflict to obtain new method embodiments or device embodiments.

[0123] As described above, the above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present disclosure can easily think of changes or substitutions, which should be covered by the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.

Claims

1. A power supply system for a data center, characterized in that, Comprising: A DC conversion unit, including N DC conversion circuits connected in parallel. The input end of the DC conversion circuit is used to be coupled to an AC power supply and a storage battery, and the output end is coupled to a first bus. When the AC power supply is supplying power, the AC power supply outputs a first voltage to the first bus through the DC conversion unit and charges the storage battery. When the AC power supply stops supplying power, the storage battery outputs the first voltage to the first bus through the DC conversion unit. Among them, the total power of at most N - 1 DC conversion circuits meets the nominal power of the DC conversion unit, and N is a positive integer not less than 2; A power supply unit, configured to convert the first voltage into a second voltage suitable for powering a data center load, with its input end coupled to the first bus and its output end used to be coupled to the data center load.

2. The power supply system for a data center according to claim 1, wherein, The DC conversion circuit includes: a front-stage hybrid circuit and a rear-stage DC circuit, which are connected through a second bus, and the second buses of each DC conversion circuit are connected in parallel. The input end of the front-stage hybrid circuit serves as the input end of the DC conversion circuit, and the output end of the rear-stage DC circuit serves as the output end of the DC conversion circuit.

3. The power supply system for a data center according to claim 1, wherein Each DC conversion circuit includes: Y1 first rectification branches and Y2 second rectification branches; For the first rectification branch, its first input end is used to be connected to any phase of the AC power supply via a first switch, and its first input end is used to be connected to the positive or negative pole of the storage battery via a second switch. Its first output end, second output end and third output end are respectively connected to the positive DC bus, the neutral line and the negative DC bus; For the second rectification branch, its first input end is used to be connected to the positive pole of the storage battery via a third switch, and its second input end is used to be connected to the negative pole of the storage battery via a fourth switch. Its first output end, second output end and third output end are respectively connected to the positive DC bus, the neutral line and the negative DC bus.

4. The data center power supply system according to claim 3, characterized in that When the AC power supply is supplying power, n of the DC conversion circuits are configured as follows: the first switch, the third switch and the fourth switch are in the closed state, and the second switch is in the open state, so that the AC power supply outputs the first voltage to the first bus through the DC conversion unit and charges the storage battery, where n ≤ N - 1.

5. The data center power supply system according to claim 3, wherein When the AC power supply stops supplying power, n of the DC conversion circuits are configured as follows: the second switch and the third switch are in the closed state; the first switch and the fourth switch are in the open state, so that the storage battery outputs the first voltage to the first bus through the DC conversion unit, where n ≤ N - 1.

6. The data center power supply system according to claim 1, wherein Each DC conversion circuit includes: Y1 first rectification branches and Y2 second rectification branches; The first rectifier branch, its first input terminal is respectively used to connect to any phase of the AC power supply via the first switch, its first input terminal is used to connect to the positive pole of the storage battery via the fifth switch, its second input terminal is used to connect to the negative pole of the storage battery via the sixth switch, and its first output terminal, second output terminal and third output terminal are respectively connected to the positive DC bus, the neutral line and the negative DC bus; The second rectifier branch, its first input terminal is connected to the positive pole of the storage battery via the third switch, its second input terminal is connected to the negative pole of the storage battery via the fourth switch, and its first output terminal, second output terminal and third output terminal are respectively connected to the positive DC bus, the neutral line and the negative DC bus.

7. The power supply system for a data center according to claim 6, wherein When the AC power supply stops supplying power, the n DC conversion circuits are configured as follows: the third switch, the fourth switch, the fifth switch and the sixth switch are in the closed state; the first switch is in the open state, so that the storage battery outputs the first voltage to the first bus through the DC conversion circuit.

8. The data center power supply system according to claim 6, wherein The first input terminal of the first rectifier branch is used to connect to the negative pole of the storage battery via the seventh switch, and the first input terminal of the second rectifier branch is connected to the negative pole of the storage battery via the eighth switch; When the AC power supply stops supplying power, the n DC conversion circuits are configured as follows: a of the fifth switches, a - b of the seventh switches, and b of the eighth switches are in the closed state, where a of the fifth switches and a - b of the seventh switches do not belong to the same first rectifier branch, and a ≤ (Y1 + b) / 2, b ≤ Y2; Other switches are in the open state, so that the storage battery outputs the first voltage to the first bus through the DC conversion unit; Or, a of the seventh switches, a - b of the fifth switches, and b of the third switches are in the closed state, where a of the seventh switches and a - b of the fifth switches do not belong to the same first rectifier branch, and a ≤ (Y1 + b) / 2, b ≤ Y2; Other switches are in the open state, so that the storage battery outputs the first voltage to the first bus through the DC conversion unit.

9. The data center power supply system according to any one of claims 3-8, characterized in that, The circuit structures of the first rectifier branch and the second rectifier branch are the same, and both include: an inductor, a first rectifier switch, a second rectifier switch, a first switching tube and a second switching tube; The first switching tube and the second switching tube are connected in series to form a bidirectional switch. The first rectifier switch and the second rectifier switch are connected in series. The common point of the first rectifier switch and the second rectifier switch is connected to the second end of the inductor and the first end of the bidirectional switch. The first end of the inductor serves as the first input terminal of the rectifier branch. The free ends of the first rectifier switch, the bidirectional switch and the second rectifier switch serve as the first output terminal, the second output terminal and the third output terminal of the rectifier branch respectively. The free end of the second rectifier switch also serves as the second input terminal.

10. A DC conversion unit, characterized in that, Include: N DC conversion circuits connected in parallel, the input ends of the DC conversion circuits are used to be coupled to an AC power supply and a storage battery, and the output ends are coupled to a first bus; when the AC power supply supplies power, the AC power supply outputs a first voltage to the first bus through the DC conversion unit and charges the storage battery; when the AC power supply stops supplying power, the storage battery outputs the first voltage to the first bus through the DC conversion unit; wherein, the total power of at most N-1 of the DC conversion circuits meets the nominal power of the DC conversion unit.

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