Direct-current standby power system

Abstract

The invention provides a direct current standby power system which comprises a three-port module and an energy storage battery, the three-port module comprises a rectification unit and a charging and discharging unit, the rectification unit is connected with the charging and discharging unit, the charging and discharging unit is connected with the energy storage battery, and the output end of the rectification unit is connected with a load; the rectifying unit is used for converting external alternating current into direct current, outputting the direct current to the load for supplying power, charging the energy storage battery through the charging and discharging unit, and outputting electric energy of the energy storage battery to the load for supplying power after the external alternating current is disconnected; the rectifying unit comprises a filter, a power factor correction circuit and a DCDC converter which are connected in sequence, the first end of the energy storage battery is connected with the first output end of the DCDC converter, and the second end of the energy storage battery is connected with the second output end of the DCDC converter through the charging and discharging unit. According to the direct-current standby power system provided by the embodiment of the invention, the service life of the energy storage battery is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of power supply equipment, and in particular to a direct current backup power system. Background Art

[0002] At present, the data center is connected to an external power supply and equipped with energy storage batteries as a backup power supply. When the city power is unavailable, the energy storage batteries are started to supply power to ensure uninterrupted power supply to the data center.

[0003] In the prior art, the DC power supply system of the data center connects the energy storage battery in parallel on the output side as a backup power supply. Figure 1 As shown. Since the load is also connected in parallel on the output side, when the load is powered by the mains, when the load changes, there is a situation where the energy storage battery discharges to the load and the DC power supply system charges the energy storage battery, which increases the number of charge and discharge times of the energy storage battery and reduces the service life of the energy storage battery. Summary of the invention

[0004] In view of the problems in the prior art, an embodiment of the present application provides a direct current backup power system, which can at least partially solve the problems in the prior art.

[0005] The present application proposes a DC backup power system, including a three-port module and an energy storage battery, wherein:

[0006] The three-port module includes a rectifier unit and a charge-discharge unit, the rectifier unit is connected to the charge-discharge unit, the charge-discharge unit is connected to the energy storage battery, and the output end of the rectifier unit is connected to a load;

[0007] The rectifier unit is used to convert the external AC power into DC power and output it to the load for power supply and charge the energy storage battery through the charging and discharging unit, and output the electric energy of the energy storage battery to the load for power supply after the external AC power is disconnected;

[0008] The rectifier unit includes a filter, a power factor correction circuit and a DCDC converter which are connected in sequence. The first end of the energy storage battery is connected to the first output end of the DCDC converter. The second end of the energy storage battery is connected to the second output end of the DCDC converter through a charge and discharge unit.

[0009] Furthermore, the DCDC converter includes a primary circuit, an isolation transformer and a secondary rectifier circuit, the input end of the isolation transformer is connected to the primary circuit, and the output end of the isolation transformer is connected to the secondary rectifier circuit; the isolation transformer is used to isolate the primary circuit and the secondary rectifier circuit, and the secondary rectifier circuit is used to convert the alternating current transmitted by the isolation transformer into direct current.

[0010] Furthermore, a first fault isolation unit is provided between the second end of the energy storage battery and the charging and discharging unit.

[0011] Furthermore, the first fault isolation unit is a fuse.

[0012] Furthermore, a filter unit and / or an overcurrent protection unit is arranged between the second end of the energy storage battery and the charge and discharge unit.

[0013] Furthermore, a second fault isolation unit is provided at the second output end of the DCDC converter.

[0014] Furthermore, the second fault isolation unit adopts a fuse or a diode.

[0015] Furthermore, an energy storage filter unit is connected in parallel to the output end of the power factor correction circuit, and the energy storage filter unit includes at least one capacitor.

[0016] Furthermore, the AC / DC conversion subsystem includes a plurality of three-port modules, and the plurality of three-port modules are connected in parallel.

[0017] Furthermore, the DC backup power system provided in the embodiment of the present application also includes a diode, an anode of the diode is connected to the positive electrode of the energy storage battery, and a cathode of the diode is connected to the input end of the load.

[0018] The DC backup power system provided in the embodiment of the present application includes a three-port module and an energy storage battery. The three-port module includes a rectifier unit and a charge-discharge unit. The rectifier unit is connected to the charge-discharge unit, the charge-discharge unit is connected to the energy storage battery, and the output end of the rectifier unit is connected to the load; the rectifier unit is used to convert the external AC power into DC power and output it to the load for power supply, charge the energy storage battery through the charge-discharge unit, and output the electric energy of the energy storage battery to the load for power supply after the external AC power is disconnected. The rectifier unit includes a filter, a power factor correction circuit and a DCDC converter connected in sequence. The first end of the energy storage battery is connected to the first output end of the DCDC converter, and the second end of the energy storage battery is connected to the second output end of the DCDC converter through the charge-discharge unit. Since the energy storage battery is not directly connected to the load, the influence of load changes on energy storage charging and discharging is avoided, the number of charge and discharge times of the energy storage battery is reduced, and the service life of the energy storage battery is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0020] Figure 1 The invention is a structural diagram of a power supply system of a data center in the prior art.

[0021] Figure 2 It is a structural diagram of the DC backup power system provided in the first embodiment of the present application.

[0022] Figure 3 It is a structural diagram of a data center power supply system provided in the second embodiment of the present application.

[0023] Figure 4 It is a structural diagram of a DC backup power system provided in the third embodiment of the present application.

[0024] Figure 5 4 is a schematic diagram of the structure of a DCDC converter provided in the fourth embodiment of the present application.

[0025] Figure 6 It is a structural diagram of a DC backup power system provided in the fifth embodiment of the present application.

[0026] Figure 7 It is a structural diagram of a DC backup power system provided in the sixth embodiment of the present application.

[0027] Figure 8 It is a structural diagram of a DC backup power system provided in the seventh embodiment of the present application.

[0028] Fig. 9 It is a structural diagram of a DC backup power system provided in the eighth embodiment of the present application.

[0029] Fig.10 It is a structural diagram of a DC backup power system provided in the ninth embodiment of the present application.

[0030] Fig.11 It is a structural diagram of a DC backup power system provided in the tenth embodiment of the present application.

[0031] Fig.12 It is a structural diagram of a DC backup power system provided in the eleventh embodiment of the present application. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the embodiments of the present application are further described in detail below in conjunction with the accompanying drawings. Here, the illustrative embodiments of the present application and their descriptions are used to explain the present application, but are not intended to limit the present application. It should be noted that, in the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined arbitrarily with each other.

[0033] In order to facilitate understanding of the technical solution provided by this application, the relevant contents of the technical solution of this application are first explained below.

[0034] In order to solve the problem that the energy storage battery is directly connected in parallel to the output side of the DC power supply system, which increases the number of times the energy storage battery is charged and discharged, thereby affecting the service life of the energy storage battery. The embodiment of the present application provides a DC backup power system, in which the energy storage battery is not connected in parallel to the output side, but the energy storage battery is built into the rectifier power supply link. Since the energy storage battery is connected to the rectifier power supply link and is not directly connected to the load, the charging and discharging of the energy storage battery is related to the rectifier unit and has nothing to do with the load, and the charging and discharging of the energy storage battery can be accurately controlled. The energy storage battery will only discharge when the external power supply is disconnected, reducing the number of times the energy storage battery is charged and discharged, thereby increasing the service life of the energy storage battery.

[0035] In addition, since the energy storage battery is no longer connected in parallel on the output side of the DC power supply system, its output voltage range can be very small. For a 240V DC power supply system, its output can be fixed at 270Vdc, and for a 336V DC power supply system, its output can be fixed at 400Vdc. The distribution switches, cables, server power supplies, etc. of downstream power-consuming equipment only need to meet this voltage range. For the same system power, the voltage on the output side can be increased, thereby reducing the current on the output side, the switch capacity can be smaller, and the cables can be thinner, that is, the cost of the downstream DC distribution system will be lower, and the loss will also be lower.

[0036] Figure 2 is a schematic diagram of the structure of the DC backup power system provided in the first embodiment of the present application, such as Figure 2 As shown, the DC backup power system provided in the embodiment of the present application includes a three-port module 1 and an energy storage battery 2, wherein:

[0037] The three-port module 1 includes a rectifier unit 11 and a charge-discharge unit 12, the rectifier unit 11 is connected to the charge-discharge unit 12, the charge-discharge unit 12 is connected to the energy storage battery 2, and the output terminal of the rectifier unit 11 is connected to a load;

[0038] The rectifier unit 11 is used to convert the external AC power into DC power and output it to the load for power supply and charge the energy storage battery 23 through the charge and discharge unit 12, and output the electric energy of the energy storage battery 2 to the load for power supply after the external AC power is disconnected.

[0039] Specifically, the input end of the rectifier unit 11 is connected to an external AC power, and the output end of the rectifier unit 11 is connected to a load. The rectifier unit 11 is connected to the charge and discharge unit 12, and the charge and discharge unit 12 is connected to the energy storage battery 2. The energy storage battery 2 is not connected in parallel to the output side of the rectifier unit 11.

[0040] When an external AC power is connected, the rectifier unit 11 converts the input AC power into DC power and supplies it to the load. At the same time, the rectifier unit 11 supplies the converted DC power to the energy storage battery 2 through the charging and discharging unit 12 to charge the energy storage battery 2. When the external AC power is disconnected, the energy storage battery 2 discharges, and the electric energy output by the energy storage battery 2 is supplied to the load through the charging and discharging unit 12 and the rectifier unit 11 to ensure uninterrupted power supply to the load. The charging and discharging unit 12 is used to realize the charging and discharging of the energy storage battery 2.

[0041] For example, Figure 3 As shown, the data room power supply system includes a transformer 101, a DC backup power system 102 and a power supply 103. The DC backup power system includes a three-port module 1021 and an energy storage battery 1022. The three-port module 1021 includes a rectifier unit 10211 and a charge-discharge unit 10212. The input end of the transformer 101 is connected to the external power grid, the output end of the transformer 101 is connected to the input end of the rectifier unit 10211, the rectifier unit 10211 is connected to the charge-discharge unit 10212, and the charge-discharge unit 10212 is connected to the energy storage battery 1022. The transformer 101 is used to convert high voltage electricity into a preset voltage and provide it to the DC backup power system 102. The output end of the DC backup power system 102 is connected to the input end of the power supply 103. The energy storage battery 2 is not connected in parallel to the output side of the DC backup power system 102. Among them, the preset voltage is set according to actual needs, and the embodiment of the present application is not limited.

[0042] When the external grid has power, the rectifier unit 10211 converts the input AC power into DC power and supplies it to the power supply 103. At the same time, the rectifier unit 10211 supplies the converted DC power to the energy storage battery 1022 through the charging and discharging unit 10212 to charge the energy storage battery 1022. When the external grid is powered off, the energy storage battery 1022 is discharged, and the electric energy output by the energy storage battery 1022 is supplied to the power supply 103 through the charging and discharging unit 10212 and the rectifier unit 10211 to ensure uninterrupted power supply to the power supply 103.

[0043] Figure 4 is a schematic diagram of the structure of the DC backup power system provided in the third embodiment of the present application. Figure 4As shown, the rectifier unit 11 includes a filter 111, a power factor correction circuit 112 and a DCDC converter 113 which are connected in sequence, a first end of the energy storage battery 2 is connected to a first output end of the DCDC converter 113, and a second end of the energy storage battery 2 is connected to a second output end of the DCDC converter 113 through a charge and discharge unit 12.

[0044] Specifically, the input end of the filter 111 is connected to the three-phase alternating current for filtering out electromagnetic interference in the alternating current. The power factor correction circuit 112 enables the input current to track the input voltage and makes the input current close to a sine wave. The DCDC converter 113 is used to convert the alternating current into direct current. The direct current output by the DCDC converter 113 charges the energy storage battery 2 through the charging and discharging unit 12. The direct current output by the DCDC converter 113 is output to the load.

[0045] For example, Figure 4 As shown, the first output end of the DCDC converter 113 is the positive output end A+, and the second output end of the DCDC converter 113 is the negative output end A-, then the positive electrode B+ of the energy storage battery 2 is connected to the charge and discharge unit 12, the negative electrode B- of the energy storage battery 2 is connected to the second output end of the DCDC converter 113, and the charge and discharge unit 12 is connected to the first output end and the second output end of the DCDC converter 113 respectively.

[0046] The DC backup power system provided in the embodiment of the present application includes a three-port module and an energy storage battery. The three-port module includes a rectifier unit and a charge-discharge unit. The rectifier unit is connected to the charge-discharge unit, the charge-discharge unit is connected to the energy storage battery, and the output end of the rectifier unit is connected to the load; the rectifier unit is used to convert the external AC power into DC power and output it to the load for power supply, charge the energy storage battery through the charge-discharge unit, and output the electric energy of the energy storage battery to the load for power supply after the external AC power is disconnected. The rectifier unit includes a filter, a power factor correction circuit and a DCDC converter connected in sequence. The first end of the energy storage battery is connected to the first output end of the DCDC converter, and the second end of the energy storage battery is connected to the second output end of the DCDC converter through the charge-discharge unit. Since the energy storage battery is not directly connected to the load, the influence of load changes on energy storage charging and discharging is avoided, the number of charge and discharge times of the energy storage battery is reduced, and the service life of the energy storage battery is improved.

[0047] Figure 5 is a schematic diagram of the structure of a DCDC converter provided in the fourth embodiment of the present application. Figure 5As shown, on the basis of the above embodiments, further, the DCDC converter 113 includes a primary circuit 1131, an isolation transformer 1132 and a secondary rectifier circuit 1133, the input end of the isolation transformer 1132 is connected to the primary circuit 1131, the output end of the isolation transformer 1132 is connected to the secondary rectifier circuit 1133, the input end of the primary circuit 1131 is connected to the output end of the power factor correction circuit 112, and the output end of the secondary rectifier circuit 1133 is connected to the input end of the load; the isolation transformer 1132 is used to isolate the primary circuit 1131 and the secondary rectifier circuit 1133, and the secondary rectifier circuit 1133 is used to convert the AC power transmitted by the isolation transformer 1132 into DC power. The primary circuit 1131 is used as the primary side of the DC conversion line to invert the DC power into high-frequency AC power. The primary circuit 1131 is selected according to actual needs, and the embodiment of the present application is not limited.

[0048] Figure 6 is a schematic diagram of the structure of a DC backup power system provided in the fifth embodiment of the present application. Figure 6 As shown, on the basis of the above embodiments, further, a first fault isolation unit 3 is provided between the second end of the energy storage battery 2 and the charging and discharging unit 12. The first fault isolation unit 3 plays a role in fault isolation.

[0049] On the basis of the above embodiments, further, the first fault isolation unit 3 adopts a fuse.

[0050] Figure 7 is a schematic diagram of the structure of a DC backup power system provided in the sixth embodiment of the present application. Figure 7 As shown, on the basis of the above embodiments, further, a filter unit 4 and / or an overcurrent protection unit 5 is provided between the second end of the energy storage battery 2 and the charge and discharge unit 12 .

[0051] Specifically, the filter unit 4 is used to filter out electromagnetic interference. The overcurrent protection unit 5 is used to suppress short-circuit current or overload current in the circuit. The overcurrent protection unit 5 can be a fuse or a protection switch, which is selected according to actual needs and is not limited in the embodiment of the present application.

[0052] Figure 8 is a structural diagram of a DC backup power system provided in the seventh embodiment of the present application, such as Figure 8 As shown in the above embodiments, further, a second fault isolation unit 114 is provided at the second output end of the DCDC converter 113. The second fault isolation unit 114 is used to prevent the current at the output end from flowing back to the DCDC converter 113 and to play a role of fault isolation.

[0053] On the basis of the above embodiments, further, the second fault isolation unit 114 adopts a fuse or a diode.

[0054] Fig. 9 is a schematic diagram of the structure of the DC backup power system provided in the eighth embodiment of the present application. Fig. 9 As shown, an energy storage filter unit 115 is connected in parallel to the output end of the power factor correction circuit 112, and the energy storage filter unit 115 includes at least one capacitor C. The capacitor C plays the role of energy storage and filtering. When the energy storage filter unit 115 includes multiple capacitors, the multiple capacitors are connected in series in sequence.

[0055] Fig.10 is a schematic diagram of the structure of a DC backup power system provided in the ninth embodiment of the present application. Fig.10 As shown, on the basis of the above embodiments, further, the DC backup power system includes multiple three-port modules 1, and the multiple three-port modules 1 included in the DC backup power system are connected in parallel. The energy storage battery 2 can be connected to one three-port module 1, or can be connected to multiple three-port modules 1, which can be set according to actual needs and is not limited in the embodiments of the present application.

[0056] Fig.11 is a schematic diagram of the structure of a DC backup power system provided in the tenth embodiment of the present application. Fig.11 As shown, on the basis of the above embodiments, further, the DC backup power system provided in the embodiment of the present application further includes a diode D, the anode of the diode D is connected to the positive electrode of the energy storage battery 2, and the cathode of the diode D is connected to the input end of the load. The circuit connecting the energy storage battery 2 and the load where the diode D is located serves as a backup branch for powering the load.

[0057] Fig.12 is a schematic diagram of the structure of the DC backup power system provided in the eleventh embodiment of the present application, such as Fig.12 As shown, the AC / DC conversion subsystem provided in the embodiment of the present application includes a three-port module and an energy storage battery 2, wherein:

[0058] The three-port module includes a rectifier unit 11 and a charge-discharge unit 12. The rectifier unit 11 includes a filter 111, a power factor correction circuit 112 and a DCDC converter 113 connected in sequence. The output end of the power factor correction circuit 112 is connected in parallel with an energy storage filter unit 115. The energy storage filter unit 115 includes capacitors C1 and C2. The first output end A- and the second output end A+ of the DCDC converter are respectively connected to the charge-discharge unit 12. A filter unit 4, a protection switch S and a fuse F1 are sequentially arranged between the charge-discharge unit 12 and the positive electrode B+ of the energy storage battery 2. The charge-discharge unit 12 is connected to the filter unit 4, the first end of the protection switch S is connected to the filter unit 4, the second end of the protection switch S is connected to the first end of the fuse F1, and the second end of the fuse F1 is connected to the positive electrode B+ of the energy storage battery 2. The negative electrode B- of the energy storage battery 2 is connected to the first output end A- of the DCDC converter. A fuse F2 is arranged at the second output end A+ of the DCDC converter.

[0059] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0060] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0061] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0062] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0063] In the description of this specification, the description with reference to the terms "one embodiment", "a specific embodiment", "some embodiments", "for example", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0064] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present application. It should be understood that the above description is only a specific embodiment of the present application and is not intended to limit the scope of protection of the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A DC backup power system, characterized in that: It includes a three-port module and an energy storage battery, wherein: The three-port module includes a rectifier unit and a charge-discharge unit, the rectifier unit is connected to the charge-discharge unit, the charge-discharge unit is connected to the energy storage battery, and the output end of the rectifier unit is connected to a load; The rectifier unit is used to convert the external AC power into DC power and output it to the load for power supply and charge the energy storage battery through the charging and discharging unit, and output the electric energy of the energy storage battery to the load for power supply after the external AC power is disconnected; The rectifier unit includes a filter, a power factor correction circuit and a DCDC converter which are connected in sequence. The first end of the energy storage battery is connected to the first output end of the DCDC converter. The second end of the energy storage battery is connected to the second output end of the DCDC converter through a charge and discharge unit.

2. The DC backup power system according to claim 1, characterized in that: The DCDC converter includes a primary circuit, an isolation transformer and a secondary rectifier circuit, wherein the input end of the isolation transformer is connected to the primary circuit, and the output end of the isolation transformer is connected to the secondary rectifier circuit; the isolation transformer is used to isolate the primary circuit and the secondary rectifier circuit, and the secondary rectifier circuit is used to convert the alternating current transmitted by the isolation transformer into direct current.

3. The DC backup power system according to claim 1, characterized in that: A first fault isolation unit is provided between the second end of the energy storage battery and the charging and discharging unit.

4. The DC backup power system according to claim 3, characterized in that: The first fault isolation unit is a fuse.

5. The DC backup power system according to claim 1, characterized in that: A filter unit and / or an overcurrent protection unit is arranged between the second end of the energy storage battery and the charge and discharge unit.

6. The DC backup power system according to claim 1, characterized in that: A second fault isolation unit is provided at the second output end of the DCDC converter.

7. The DC backup power system according to claim 6, characterized in that: The second fault isolation unit is a fuse or a diode.

8. The DC backup power system according to claim 1, characterized in that: An energy storage filter unit is connected in parallel to the output end of the power factor correction circuit, and the energy storage filter unit includes at least one capacitor.

9. The DC backup power system according to claim 1, characterized in that: The DC backup power system comprises a plurality of three-port modules, and the plurality of three-port modules are connected in parallel.

10. The DC backup power system according to any one of claims 1 to 9, characterized in that: It also includes a diode, wherein the anode of the diode is connected to the positive electrode of the energy storage battery, and the cathode of the diode is connected to the input end of the load.

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