CN114256956B - DC power supply system - Google Patents

DC power supply system Download PDF

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Publication number
CN114256956B
CN114256956B CN202010996992.3A CN202010996992A CN114256956B CN 114256956 B CN114256956 B CN 114256956B CN 202010996992 A CN202010996992 A CN 202010996992A CN 114256956 B CN114256956 B CN 114256956B
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Prior art keywords
power supply
supply module
direct current
backup
current power
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CN202010996992.3A
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CN114256956A (en
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请求不公布姓名
宫新光
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Shenzhen Hangyi Intellectual Property Services Co ltd
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Shenzhen Hangyi Intellectual Property Services Co ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H02J9/068—Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems

Abstract

The application provides a direct current power supply system, which utilizes the on-off characteristics of a diode in the working process, when the output voltage of a main direct current power supply module is higher than that of a backup direct current power supply module, the first diode is in an on state, and the second diode is in an off state, so that the main direct current power supply module supplies power to load equipment; when the output voltage of the main direct current power supply module is lower than that of the backup direct current power supply module, the second diode is in a conducting state, the first diode is in a cut-off state, and the backup direct current power supply module supplies power to the load equipment.

Description

DC power supply system
Technical Field
The present application relates to the field of power, and in particular, to a dc power supply system for implementing redundant power supply.
Background
In order to ensure the normal operation of a large number of IT devices, such as servers, data storage devices, and network devices, a redundant power supply system is generally adopted in a data center, so as to avoid power failure of the IT devices caused by abnormal power supply of a main power supply module. In the redundant power supply system of the n+1 architecture, STS (Static Transfer Switch ) is generally used as a switching element to achieve a shorter switching time, but the STS is currently applicable to an ac power supply system and cannot be compatible with a dc power supply design. Therefore, in the direct current power supply system for realizing redundant power supply, the function of public backup switching cannot be realized by using the STS by using the N+1 alternating current power supply system, so that the direct current power supply system has longer switching time of the standby power supply module when the power supply of the main power supply module is abnormal in the design of the N+1 system, and cannot be suitable for the power supply scene of IT equipment.
Disclosure of Invention
An object of the present application is to provide a dc power supply system, which is used for solving the problem that the switching time of the dc power supply system is long when the power supply module is switched.
To achieve the above object, an embodiment of the present application provides a dc power supply system, including:
the output end of each main direct current power supply module is connected with the input end of the corresponding load device through a first diode, the output end of the main direct current power supply module is connected with the anode of the first diode, the input end of the load device is connected with the cathode of the first diode, when the power input of the main direct current power supply module is normal, the output voltage of the main direct current power supply module is a first voltage value, and when the power input of the main direct current power supply module is abnormal, the output voltage of the main direct current power supply module starts to drop from the first voltage value;
the output end of each backup direct current power supply module is connected with the input end of each load device through a second diode respectively, the output end of each backup direct current power supply module is connected with the anode of the second diode, the input end of each load device is connected with the cathode of the second diode, and the output voltage of each backup direct current power supply module is a second voltage value, wherein the first voltage value is higher than the second voltage value;
when the output voltage of the main direct current power supply module is higher than that of the backup direct current power supply module, the first diode is in a conducting state, the second diode is in a cut-off state, and the main direct current power supply module supplies power to load equipment; when the output voltage of the main direct current power supply module is lower than that of the backup direct current power supply module, the second diode is in a conducting state, the first diode is in a cut-off state, and the backup direct current power supply module supplies power to the load equipment.
Further, the main direct current power supply module comprises a direct current power supply module and a power supply battery, the input end of the direct current power supply module is connected with a power supply for providing power input, and the output end of the direct current power supply module is connected with the power supply battery and the anode of the first diode;
when the power input of the main direct current power supply module is normal, the power supply battery is in a charging state, and the power supply provides power output through the direct current power supply module; when the power input of the main direct current power supply module is abnormal, the power supply battery is in a discharging state, and the power supply battery provides power output.
Further, the backup direct current power supply module comprises a direct current power supply module, a DC/DC charge-discharge control module and a power supply battery, wherein the input end of the direct current power supply module is connected with a power supply for providing power input, and the output end of the direct current power supply module is connected with the anode of the second diode and is connected with the power supply battery through the DC/DC bidirectional charge-discharge control module;
when the power input of the backup direct current power supply module is normal, the power supply battery is in a charging state, and the power supply provides power output through the direct current power supply module; when the power input of the backup direct current power supply module is abnormal, the power supply battery is in a discharging state, the power supply battery provides power output, and the DC/DC charge-discharge control module controls the output voltage to keep a second voltage value.
Further, the input end of the load device comprises a first input end and a second input end, the output end of each main direct current power supply module is connected with the first input end and the second input end of the corresponding load device through a first diode, and the output end of each backup direct current power supply module is connected with the first input end and/or the second input end of each load device through a second diode.
Further, the number of the backup direct current power supply modules is one, and the output end of each backup direct current power supply module is connected with the first input end and the second input end of each load device through a second diode respectively.
Further, the number of the main direct current power supply modules is more than or equal to 2.
Further, the number of the backup direct current power supply modules is two, the backup direct current power supply modules comprise a first backup direct current power supply module and a second direct current power supply module, the output end of the first backup direct current power supply module is connected with the first input end of each load device through a second diode respectively, and the output end of the second backup direct current power supply module is connected with the second input end of each load device through a second diode respectively.
Further, the number of the main direct current power supply modules is more than or equal to 2.
Further, the input ends of the load equipment are two power distribution units.
Further, the first voltage value is 270V (settable), and the second voltage value is 240V (settable).
In the direct current power supply system provided by the embodiment of the application, the direct current power supply system comprises at least one main direct current power supply module and at least one backup direct current power supply module, wherein the output end of each main direct current power supply module is connected with the input end of a corresponding load device through a first diode, the output end of each main direct current power supply module is connected with the anode of the first diode, the input end of the load device is connected with the cathode of the first diode, when the electric power input of the main direct current power supply module is normal, the output voltage of the main direct current power supply module is a first voltage value, and when the electric power input of the main direct current power supply module is abnormal, the output voltage of the main direct current power supply module starts to drop from the first voltage value; the output end of each backup direct current power supply module is connected with the input end of each load device through a second diode respectively, the output end of each backup direct current power supply module is connected with the anode of the second diode, the input end of each load device is connected with the cathode of the second diode, the output voltage of each backup direct current power supply module is a second voltage value, and the first voltage value is higher than the second voltage value. In the working process of the direct current power supply system, the characteristics of on and off of the diodes are utilized, when the output voltage of the main direct current power supply module is higher than the output voltage of the backup direct current power supply module, the first diode is in an on state, the second diode is in an off state, and the main direct current power supply module supplies power to load equipment; when the output voltage of the main direct current power supply module is lower than that of the backup direct current power supply module, the second diode is in a conducting state, the first diode is in a cut-off state, and the backup direct current power supply module supplies power to the load equipment.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the following drawings, in which:
FIG. 1 is a schematic diagram of an AC power system;
fig. 2 is a schematic structural diagram of a dc power supply system according to an embodiment of the present application;
FIG. 3 is a timing chart of diode state change in a DC power supply system according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of another dc power supply system according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of a dc power supply system with an n+1 architecture according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of a dc power supply system with an n+2 architecture according to an embodiment of the present application;
FIG. 7 is a schematic diagram of a DC public backup power supply system employing principles of an embodiment of the present application;
fig. 8 is a timing chart of a working mode switching process of a public backup dc power supply system according to an embodiment of the present application;
the same or similar reference numbers in the drawings refer to the same or similar parts.
Detailed Description
The present application is described in further detail below with reference to the accompanying drawings.
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
In order to make the present application solution better understood by those skilled in the art, the following description will be made in detail and with reference to the accompanying drawings in the embodiments of the present application, it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, shall fall within the scope of the present application.
Fig. 1 shows an ac power supply system, which includes N primary power supply modules and a backup power supply module, so as to form an n+1-architecture redundant power supply system. In this embodiment, N is set to 3, that is, there are 3 main power modules, each of the main power modules and the backup power modules includes a UPS (Uninterruptible Power Supply ) module, and the UPS power supplies power to two PDUs (Power Distribution Unit, power distribution units) of the rack after being connected to the STS through two outputs. Because the STS cannot be compatible with the direct current power supply design, in a direct current power supply system for realizing redundant power supply, the STS cannot be used as a switching element, so that the switching time is long when the power supply of a main power supply module of the direct current power supply system is abnormal, and the direct current power supply system cannot be suitable for a scene of supplying power to various IT equipment on a rack.
In order to solve the above-mentioned problem, the embodiment of the application provides a dc power supply system, including at least one main dc power supply module and at least one backup dc power supply module, wherein, the quantity of main dc power supply module and backup dc power supply module can be confirmed according to the demand of actual scene. For example, in the scenario shown in fig. 2, if there are two groups of load devices 30, the number of the primary dc power supply modules 40 may be set to 2, and power may be supplied to the 2 groups of load devices, respectively, and the number of the backup dc power supply modules 50 may be set to 1, and at the same time, backup power may be supplied to the 2 load devices.
The number of the main dc power supply modules can be determined according to the requirements of the actual power supply scenario, for example, the number of the main dc power supply modules can be set to at least 2, 4, 16 or even more, and in the embodiment of the present application, the specific number is not limited. The output end of each main direct current power supply module 40 is connected with the input end of the corresponding load device 30 through a first diode D1, the output end of the main direct current power supply module 40 is connected with the anode of the first diode D1, and the input end of the load device 30 is connected with the cathode of the first diode D1. When the power input of the main dc power supply module 40 is normal, the output voltage Vm of the main dc power supply module 40 is a first voltage value V1, and when the power input of the main dc power supply module 40 is abnormal, the output voltage Vm of the main dc power supply module starts to decrease from the first voltage value V1.
The output end of each backup direct current power supply module 50 is connected with the input end of each load device 30 through a second diode D2, the output end of each backup direct current power supply module 50 is connected with the anode of the second diode D2, the input end of each load device 30 is connected with the cathode of the second diode D2, the output voltage Vr of each backup direct current power supply module 50 is a second voltage value V2, and the first voltage value V1 is higher than the second voltage value V2. The specific values of the first voltage value and the second voltage value can be set according to specific requirements of the load equipment in an actual application scene, for example, when the power supply scene is applied to the IT equipment, the second voltage value can be set to 240V, the first voltage value is set to 270V, and when the power supply scene is applied to other equipment, the first voltage value and the second voltage value can also be set to higher or lower voltage values according to requirements.
In the process that the power input of the main dc power supply module 40 is changed from normal to abnormal, the output voltage Vm of the main dc power supply module 40 starts to decrease from the first voltage value V1 and gradually decreases to be lower than the second voltage value V2, so that the states of the first diode D1 and the second diode D2 are changed, and the power supply module of the load device is switched between the main dc power supply module 40 and the backup dc power supply module 50. Fig. 3 shows the change in diode state, during which the relevant voltage inputs are shown in table 1 below:
TABLE 1
In the previous stage of the normal input power of the main dc power supply module 40 and the abnormal input power, the output voltage Vm of the main dc power supply module 40 is higher than the output voltage Vr of the backup dc power supply module 50, at this time, the first diode D1 is in the on state, and the second diode D2 is in the off state, so that the main dc power supply module 40 supplies power to the load device 30, that is, the input voltage Vin of the load device is Vm. In the latter stage of the abnormal input power of the main dc power supply module 40, when the output voltage Vm of the main dc power supply module 40 is lower than the output voltage Vr of the backup dc power supply module 50, the second diode D2 is in an on state, the first diode D1 is in an off state, and the backup dc power supply module 50 supplies power to the load device 30, that is, the input voltage Vin of the load device is Vr.
In the working process of the direct current power supply system, the switching between the main direct current power supply module and the backup direct current power supply module is realized by utilizing the on and off characteristics of the diode. The switching speed of the on and off states of the diode is high, so that the switching speed can reach millisecond level, the switching performance of the diode and the STS in an alternating current system can reach the same level, and the rapid switching between the main power supply module and the standby power supply module is realized.
In some embodiments of the present application, the main dc power module 40 may include a dc power module 41 and a power battery 42. The input of the dc power supply module 41 is connected to a power supply 60 for providing a power input, and the output of the dc power supply module 41 is connected to the anode of the first diode 10. In a practical scenario, the DC power supply module 41 may be an AC/DC (alternating current/direct current) conversion module, for example, a device with rectification and transformation functions, which is used for accessing an AC power source 60 such as a mains supply, and outputting a DC power after AC/DC conversion, as shown in fig. 4.
When the power input of the main dc power supply module 40 is normal, the power supply battery 42 is in a charged state, and the power supply provides power output through the dc power supply module. At this time, the power output of the entire main dc power supply module 40 may be directly provided by the output terminal of the dc power supply module 41, or may be provided by the output terminal of the power supply battery 42, that is, the rechargeable battery is discharged as the power output of the main dc power supply module 40 while being charged. When the power input of the main dc power supply module is abnormal, the power supply battery is in a discharge state, and the power supply battery 42 provides power output. Taking the scenario shown in fig. 4 as an example, when the AC power supply 60 can normally input power to the AC/DC conversion module 41, the AC/DC conversion module 41 can convert the AC power into the DC power of the first voltage value and output the DC power, and the output DC power can charge the power supply battery 42 and can be output as the entire main DC power supply module 40.
When the power input of the main dc power supply module 40 is abnormal, the power supply battery is in a discharge state, and the power supply battery provides power output. Still taking the scenario shown in fig. 3 as an example, when the AC power supply 60 stops supplying power or a circuit break occurs between the AC power supply and the main DC power supply module 40, the AC power supply 60 cannot normally input power to the AC/DC conversion module 41, and at this time, the AC/DC conversion module cannot output DC power, and the power supply battery 42 will be converted from a charged state to a discharged state, i.e., the DC power output from the power supply battery 42 will be output as the whole main DC power supply module 40. During the discharging process of the power supply battery 42, the stored power thereof gradually decreases, and thus the output voltage Vm of the main dc power supply module starts to decrease from the initial first voltage value.
In some embodiments of the present application, the backup DC power supply module 50 may include a DC power supply module 51, a DC/DC charge/discharge control module 53, and a power supply battery 52. The input end of the direct current power supply module 51 is connected with a power supply 60 for providing power input, and the output end of the direct current power supply module 51 is connected with the power supply battery 52 through a DC/DC bidirectional charge and discharge control module 53. Similar to the main DC power supply module, the DC power supply module of the backup DC power supply module 50 is also used for providing DC output, and in a practical scenario, the DC power supply module 51 may also be an AC/DC (alternating current/direct current) conversion module, for example, a device with rectification and transformation functions, which is used for accessing an AC power source 60 such as a mains supply, and outputting DC power after AC/DC conversion, as shown in fig. 4. The difference from the main DC power supply module is that the backup DC power supply module 50 further includes a DC/DC charge/discharge control module 53, and the DC/DC charge/discharge control module 53 can control the output voltage Vr thereof when the power supply battery 52 is in a discharge state, so that the output voltage Vr thereof is always maintained at the second voltage value V2.
Thus, when the power input of the backup dc power supply module 50 is normal, the power supply battery 52 is in a charged state, and the power supply 60 supplies power output through the dc power supply module 51. At this time, the power output of the whole backup dc power supply module 50 may be directly provided by the output end of the dc power supply module 51, or may be provided by the output end of the power supply battery 52, that is, the rechargeable battery is discharged as the power output of the main dc power supply module 50 while being charged. Taking the scenario shown in fig. 4 as an example, when the AC power supply 60 can normally input power to the AC/DC conversion module 51, the AC/DC conversion module 51 can convert the AC power into the DC power of the second voltage value to output, and the output DC power can charge the power supply battery 52 and can be output as the whole backup DC power supply module 50.
When the power input of the backup DC power supply module 50 is abnormal, the power supply battery 52 is in a discharging state, the power supply battery 52 provides power output, and the DC/DC charge-discharge control module 53 controls the output voltage Vr to maintain the second voltage value V2. Thus, the backup dc power supply module 50 can always output the dc power of the second voltage value regardless of whether the power input is abnormal or not, without lowering the output voltage due to the power loss of the power supply battery 52.
Therefore, during normal operation, the output voltage (for example, 270V) of the main direct current power supply module is higher than the output voltage (for example, 240V) of the standby direct current power supply module, so that the first diode of the load equipment connected with the main direct current power supply module is conducted, the second diode connected with the standby direct current power supply module is cut off, and at the moment, the main direct current power supply module supplies power to the load. When the input power of the main direct current power supply module is abnormal, the power supply battery discharges until the output voltage is lower than the output voltage of the backup direct current power supply module, at the moment, the first diode of the load equipment connected with the main direct current power supply module is cut off, the second diode of the load equipment connected with the backup direct current power supply module is conducted, and the power input of the load equipment is switched from the main direct current power supply module to the backup direct current power supply module.
In some embodiments of the present application, the load device may adopt a device that receives two-way dc power supply, that is, the input end of the load device includes a first input end a and a second input end B, and in the use process, only one of the input ends needs to be ensured to obtain normal power supply, so that the load device can work normally. For example, in the embodiment of the present application, when the load device is in normal use, the two input ends a and B each bear 50% of power supply, and when one input end fails, the remaining input ends provide 100% of power, so that the reliability of power supply is improved. For such a dual-dc power supply load device, the output end of each main dc power supply module 40 is connected to the first input end a and the second input end B of the corresponding load device 30 through a first diode D1, and the output end of each backup dc power supply module 50 is connected to the first input end a and/or the second input end B of each load device through a second diode D2.
In a practical scenario, for any backup dc power supply module, whether the output terminal is connected to both input terminals of the load device through the second diode or to only one of the input terminals through the second diode may depend on the architecture of the entire dc power supply system. For example, when the dc power supply system adopts the n+1 architecture, that is, the number of the main dc power supply modules 40 is N, and the number of the backup dc power supply modules 50 is one, the output end of each backup dc power supply module 50 is connected to the first input end a and the second input end B of each load device 30 through a second diode D2, as shown in fig. 5. Therefore, when any one of the main dc power supply modules 40 fails, the backup dc power supply module 50 can still supply power to the load device 30 through the two input terminals thereof, so as to ensure that the load device continues to work normally.
For example, when the dc power supply system adopts the n+2 architecture, that is, the number of the main dc power supply modules 40 is N, and the number of the backup dc power supply modules 50 is two, the output end of each backup dc power supply module 50 is connected to one of the output ends of each load device 30 through a second diode D2. As shown in fig. 6, if the two backup dc power supply modules 50 are a first backup dc power supply module 501 and a second backup dc power supply module 502, the output end of the first backup dc power supply module 501 is connected to the first input end a of each load device through a second diode D2, and the output end of the second backup dc power supply module 502 is connected to the second input end B of each load device through a second diode D2.
Compared with the direct current power supply system with the n+1 architecture, the direct current power supply system with the n+2 architecture has better usability. When the n+1 architecture is adopted, if the value of N is set too high, it may not be possible to ensure that all load devices work normally when more main dc power supply modules 40 fail. When the n+2 architecture is adopted, the tolerance of the dc power supply system to the number of faults of the main dc power supply module 40 is higher, so that N can be set larger, at this time, the balance between usability and cost can be achieved, and when the load equipment is more, the comprehensive cost is lower compared with that of the n+1 architecture.
Fig. 7 shows a DC public backup power supply system adopting the principle of the embodiment of the present application, where the power supply system includes 1 backup DC power supply module 50 and two main DC power supply modules 40, each main DC power supply module 40 includes an AC/DC conversion module 41 and a power supply battery 42, an input end of the AC/DC conversion module 41 is connected to a mains supply 60, an output end of the AC/DC conversion module is connected to the power supply battery 42, an output DC power charges the power supply battery 42, and the power supply battery 42 directly hangs the first output bus 10 as an output end of the whole main DC power supply module 40. The output voltage at the time of the mains power input being normal may be set to 270V.
Each standby direct current power supply module 50 comprises an AC/DC conversion module 51, a power supply battery 52 and a DC/DC bidirectional charge/discharge control module 53, wherein the input end of the AC/DC conversion module 51 is connected with the mains supply 60, the output end of the AC/DC conversion module is connected with the power supply battery 52, the output direct current charges the power supply battery 52, and the power supply battery 52 is hung on the second output bus 20 through the DC/DC bidirectional charge/discharge control module 53 to serve as the output end of the whole main direct current power supply module 50, so that the output voltage can be stably maintained at 240V at any moment.
The load device in this embodiment is a dual power server, the corresponding input ends of the dual power server are two Power Distribution Units (PDU), and for each power distribution unit, the corresponding primary dc power supply module 40 and the corresponding backup dc power supply module 50 are respectively connected through a first diode D1 and a second diode D2, wherein the anode of the diode is connected to the primary dc power supply module 40 or the backup dc power supply module 50, and the cathode of the diode is connected to the power distribution unit, so that the cathodes of the two diodes are connected and have the same potential. In the switching process, the principle that the diode is conducted when the anode voltage of the diode is larger than the cathode voltage, and the diode is cut off otherwise is utilized, so that the rapid switching between the main and standby direct current power supply modules is realized. Table 2 below shows the operation modes of the dc common backup power supply system in fig. 7, and fig. 8 shows a timing chart at the time of switching of the relevant operation modes.
TABLE 2
In summary, in the solution provided in the embodiments of the present application, the on and off characteristics of the diodes are utilized, when the output voltage of the main dc power supply module is higher than the output voltage of the backup dc power supply module, the first diode is in an on state, and the second diode is in an off state, so that the main dc power supply module supplies power to the load device; when the output voltage of the main direct current power supply module is lower than that of the backup direct current power supply module, the second diode is in a conducting state, the first diode is in a cut-off state, and the backup direct current power supply module supplies power to the load equipment.
The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe the embodiments of the present application described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Claims (8)

1. A direct current power supply system, the power supply system comprising:
the output end of each main direct current power supply module is connected with the input end of the corresponding load device through a first diode, the output end of the main direct current power supply module is connected with the anode of the first diode, the input end of the load device is connected with the cathode of the first diode, when the power input of the main direct current power supply module is normal, the output voltage of the main direct current power supply module is a first voltage value, and when the power input of the main direct current power supply module is abnormal, the output voltage of the main direct current power supply module starts to drop from the first voltage value;
the output end of each backup direct current power supply module is connected with the input end of each load device through a second diode respectively, the output end of each backup direct current power supply module is connected with the anode of the second diode, the input end of each load device is connected with the cathode of the second diode, and the output voltage of each backup direct current power supply module is a second voltage value, wherein the first voltage value is higher than the second voltage value;
when the output voltage of the main direct current power supply module is higher than that of the backup direct current power supply module, the first diode is in a conducting state, the second diode is in a cut-off state, and the main direct current power supply module supplies power to load equipment; when the output voltage of the main direct current power supply module is lower than that of the backup direct current power supply module, the second diode is in a conducting state, the first diode is in a cut-off state, and the backup direct current power supply module supplies power to the load equipment;
the backup direct current power supply module comprises a direct current power supply module, a DC/DC charge-discharge control module and a power supply battery, wherein the input end of the direct current power supply module is connected with a power supply for providing power input, and the output end of the direct current power supply module is connected with the power supply battery through the DC/DC bidirectional charge-discharge control module;
when the power input of the backup direct current power supply module is normal, the power supply battery is in a charging state; when the power input of the backup direct current power supply module is abnormal, the power supply battery is in a discharging state, the power supply battery provides power output, and the DC/DC charge-discharge control module controls the output voltage to keep a second voltage value;
the main direct current power supply module comprises a direct current power supply module and a power supply battery, wherein the input end of the direct current power supply module is connected with a power supply for providing power input, and the output end of the direct current power supply module is connected with the power supply battery;
when the power input of the main direct current power supply module is normal, the power supply battery is in a charging state; when the power input of the main direct current power supply module is abnormal, the power supply battery is in a discharging state, and the power supply battery provides power output.
2. The system of claim 1, wherein the input terminals of the load device comprise a first input terminal and a second input terminal, the output terminal of each primary dc power module is connected to the first input terminal and the second input terminal of the corresponding load device through a first diode, and the output terminal of each backup dc power module is connected to the first input terminal and/or the second input terminal of each load device through a second diode.
3. The system of claim 2, wherein the number of backup dc power modules is one, and the output of each backup dc power module is connected to the first input and the second input of each load device through a second diode, respectively.
4. The system of claim 3, wherein the number of primary dc power modules is 2 or more.
5. The system of claim 2, wherein the number of backup dc power supply modules is two, and the backup dc power supply system comprises a first backup dc power supply module and a second backup dc power supply module, wherein the output end of the first backup dc power supply module is connected to the first input end of each load device through a second diode, and the output end of the second backup dc power supply module is connected to the second input end of each load device through a second diode.
6. The system of claim 5, wherein the number of primary dc power modules is 2 or more.
7. The system of claim 2, wherein the input of the load device is two power distribution units.
8. The system of claim 1, wherein the first voltage value is 270V and the second voltage value is 240V.
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CN116111708A (en) * 2022-11-15 2023-05-12 航霈科技(深圳)有限公司 Power supply system and power supply control method

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CN103490492A (en) * 2013-08-28 2014-01-01 北京百度网讯科技有限公司 High-voltage direct-current power supply system
CN106410955A (en) * 2016-10-28 2017-02-15 北京航天控制仪器研究所 Uninterruptible power supply circuit used for gravity measurement
CN206077055U (en) * 2016-08-15 2017-04-05 阿里巴巴集团控股有限公司 The electric power system and machine room of data center
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JPH11103540A (en) * 1997-09-29 1999-04-13 Fuji Electric Co Ltd Uninterruptive power source system
CN103490492A (en) * 2013-08-28 2014-01-01 北京百度网讯科技有限公司 High-voltage direct-current power supply system
CN206077055U (en) * 2016-08-15 2017-04-05 阿里巴巴集团控股有限公司 The electric power system and machine room of data center
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