CN114256956A - DC power supply system - Google Patents

DC power supply system Download PDF

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Publication number
CN114256956A
CN114256956A CN202010996992.3A CN202010996992A CN114256956A CN 114256956 A CN114256956 A CN 114256956A CN 202010996992 A CN202010996992 A CN 202010996992A CN 114256956 A CN114256956 A CN 114256956A
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Prior art keywords
power supply
supply module
diode
backup
direct current
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CN202010996992.3A
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CN114256956B (en
Inventor
宫新光
其他发明人请求不公开姓名
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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 characteristic of diode conduction and cut-off in the working process, when the output voltage of a main direct current power supply module is higher than the output voltage of a backup direct current power supply module, a first diode is in a conduction state, a 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 stopping state, the backup direct current power supply module supplies power to the load equipment, and the switching speed of the conducting state and the stopping state of the diode is high, so that the millisecond level can be reached, and the switching performance of the diode and the STS in the alternating current system can reach the same level.

Description

DC power supply system
Technical Field
The present application relates to the field of power, and more particularly, to a dc power supply system for implementing redundant power supply.
Background
In order to ensure the normal operation of the IT devices, a redundant power supply system is generally adopted to avoid the power failure of the IT devices caused by abnormal power supply of the main power supply module. In a redundant power supply system with an N +1 architecture, an STS (Static Transfer Switch) is generally used as a switching element to achieve a short switching time, but the current STS is suitable for an ac power supply system and is not compatible with a dc power supply design. Therefore, in a dc power supply system for implementing redundant power supply, the N +1 ac power supply system cannot be used to implement the function of common backup switching by using STS, so that the dc power supply system is designed in an N +1 system, and when the main power supply module supplies power abnormally, the backup power supply module is switched for a long time, and cannot be applied to 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 to solve the problem that the switching time of the dc power supply system is long when the power supply modules are switched.
In order to achieve the above object, an embodiment of the present application provides a dc power supply system, where the power supply system includes:
the output end of each main direct current power supply module is connected with the input end of corresponding load equipment 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 each load equipment 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, 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;
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 stopping state, and the main direct current power supply module supplies power to the load equipment; when the output voltage of the main direct current power supply module is lower than the output voltage of the backup direct current power supply module, the second diode is in a conducting state, the first diode is in a stopping state, and the backup direct current power supply module supplies power to the load equipment.
Furthermore, 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 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 discharge state, and the power supply battery provides power output.
Furthermore, the backup direct-current power supply module comprises a direct-current power supply module, a DC/DC charging and discharging 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 charging and discharging 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 charging and discharging control module controls the output voltage to keep a second voltage value.
Furthermore, the input ends of the load devices include a first input end and a second input end, the output end of each main direct current power supply module is connected to 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 to the first input end and/or the second input end of each load device through a second diode.
Furthermore, 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.
Furthermore, the number of the main direct current power supply modules is more than or equal to 2.
Furthermore, the number of the backup direct-current power supply modules is two, and the backup direct-current power supply modules comprise a first backup direct-current power supply module and a second direct-current power supply module, wherein 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, 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.
Furthermore, the number of the main direct current power supply modules is more than or equal to 2.
Further, the input ends of the load devices are two power distribution units.
Further, the first voltage value is 270V (set), and the second voltage value is 240V (set).
The direct current power supply system provided by the embodiment of the application 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 corresponding load equipment through a first diode, the output end of each main direct current power supply module is connected with the anode of the corresponding first diode, the input end of each load equipment is connected with the cathode of the corresponding first diode, when the power input of the main direct current power supply module is normal, the output voltage of each main direct current power supply module is a first voltage value, and when the power input of each main direct current power supply module is abnormal, the output voltage of each main direct current power supply module starts to be reduced 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, 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 conduction and cut-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 a conduction 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 stopping state, the backup direct current power supply module supplies power to the load equipment, and the switching speed of the conducting state and the stopping state of the diode is high, so that the millisecond level can be reached, and the switching performance of the diode and the STS in the alternating current system can reach the same level.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
FIG. 1 is a schematic diagram of an AC power supply system;
fig. 2 is a schematic structural diagram of a dc power supply system according to an embodiment of the present disclosure;
FIG. 3 is a timing diagram illustrating a state change of a diode in a DC power supply system according to an embodiment of the present invention;
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 disclosure;
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 disclosure;
fig. 7 is a schematic structural diagram of a dc common backup power supply system according to the principle of the embodiment of the present application;
fig. 8 is a timing chart of an operating mode switching process of a common backup dc power supply system according to an embodiment of the present application;
the same or similar reference numbers in the drawings identify the same or similar elements.
Detailed Description
The present application is described in further detail below with reference to the attached figures.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection 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 a redundant power supply system with an N +1 architecture. In this embodiment, N is set to 3, that is, there are 3 main Power Supply modules, each main Power module and each backup Power module includes a UPS (Uninterruptible Power Supply) module, and the UPS Power Supply supplies Power to two PDU (Power Distribution Unit) of the rack after being connected to the STS through two output paths. Because the STS is not compatible with the dc power supply design, the STS cannot be used as a switching element in a dc power supply system for implementing redundant power supply, which results in a longer switching time when the main power supply module of the dc power supply system is abnormally powered, and thus cannot be applied to a scenario of supplying power to various IT devices on a rack.
In order to solve the above problem, an embodiment of the present application provides a dc power supply system, which includes at least one main dc power supply module and at least one backup dc power supply module, where the number of the main dc power supply modules and the backup dc power supply modules may be determined according to the requirement of an actual scene. For example, in the scenario shown in fig. 2, if there are two groups of load devices 30, the number of the active dc power supply modules 40 may be set to 2, and the number of the backup dc power supply modules 50 is set to 1, and the backup power supplies are provided for the 2 load devices.
The number of the active dc power supply modules may be determined according to the requirement of an actual power supply scenario, for example, may be set to be at least 2, 4, 16, or even more, and the specific number is not limited in this embodiment of the application. The output end of each main dc power supply module 40 is connected to the input end of the corresponding load device 30 through a first diode D1, the output end of the main dc power supply module 40 is connected to the anode of the first diode D1, and the input end of the load device 30 is connected to 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 the 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 dc power supply module 50 is connected to the input end of each load device 30 through a second diode D2, the output end of the backup dc power supply module 50 is connected to the anode of the second diode D2, the input end of the load device 30 is connected to the cathode of the second diode D2, the output voltage Vr of the backup dc 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 may be set according to specific requirements of the load device in an actual application scenario, for example, when the voltage regulator is applied to a power supply scenario of the IT device, the second voltage value may be set to 240V, the first voltage value may be set to 270V, and when the voltage regulator is applied to a power supply scenario of other devices, the first voltage value and the second voltage value may 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 changes from normal to abnormal, the output voltage Vm of the main dc power supply module 40 will decrease from the first voltage value V1 to be gradually lower than the second voltage value V2, which will cause the states of the first diode D1 and the second diode D2 to change, so that the power supply module of the load device switches between the main dc power supply module 40 and the backup dc power supply module 50. Fig. 3 shows the change of the diode state, and the relevant voltage input is shown in table 1 below during the change:
Figure BDA0002692884400000061
TABLE 1
In the previous stage of the normal input power and the abnormal input power of the main dc power supply module 40, 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, the second diode D2 is in the off state, 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 later stage of the abnormal input power of the primary dc power supply module 40, when the output voltage Vm of the primary dc power supply module 40 is lower than the output voltage Vr of the backup dc power supply module 50, at this time, the second diode D2 is in a conducting state, the first diode D1 is in a blocking 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 characteristic of the on and off of the diode. Because the switching speed of the on and off states of the diode is high, the millisecond level can be reached, the switching performance of the diode and the switching performance of the STS in the 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 active dc power supply module 40 may include a dc power supply module 41 and a power supply battery 42. The input end of the dc power supply module 41 is connected to a power supply 60 for providing power input, and the output end of the dc power supply module 41 is connected to the anode of the first diode 10. In an actual 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 voltage transformation functions, and is used to access an AC power supply 60 such as a mains supply and output 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 charging 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 provided directly 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 discharges while being charged as the power output of the main dc power supply module 40. 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 with the first voltage value to output, and the output DC power can be used to charge the power supply battery 42 and also can be used as the output of 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 is disconnected 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, at this time, the AC/DC conversion module cannot output DC power, the power supply battery 42 is converted from a charging state to a discharging state, that is, the DC power output by the power supply battery 42 is used as the output of the whole main DC power supply module 40. During the discharging process of the power supply battery 42, the stored power will gradually decrease, so that the output voltage Vm of the active dc power supply module will start 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 charging and discharging control module 53, and a power supply battery 52. The input end of the direct current supply module 51 is connected with a power supply 60 for providing power input, and the output end of the direct current supply module 51 is connected with a power supply battery 52 through a DC/DC bidirectional charging and discharging 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 to provide DC output, in an actual 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 voltage transformation functions, which is used to access an AC power supply 60 such as a mains supply and output DC after AC/DC conversion, as shown in fig. 4. The difference from the primary DC power supply module is that the backup DC power supply module 50 further includes a DC/DC charging/discharging control module 53, and the DC/DC charging/discharging control module 53 can control the output voltage Vr of the power supply battery 52 to be always kept at the second voltage value V2 when the power supply battery is in a discharging state.
Thus, when the power input to 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 provided directly by the output terminal of the dc power supply module 51, or may be provided by the output terminal of the power supply battery 52, that is, the rechargeable battery discharges while being charged as the power output of the main dc power supply module 50. 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 with the second voltage value to output, and the output DC power can be used to charge the power supply battery 52 and also can be used as the output of 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 discharge state, the power supply battery 52 provides power output, and the DC/DC charging/discharging control module 53 controls the output voltage Vr to maintain the second voltage value V2. Therefore, the backup dc power supply module 50 can always output dc power of the second voltage value regardless of the abnormality of the power input, and the output voltage is not lowered due to the power loss of the power supply battery 52.
Therefore, during normal operation, because the output voltage (for example, set to 270V) of the main dc power supply module is higher than the output voltage (for example, set to 240V) of the standby dc power supply module, the first diode of the load device connected to the main dc power supply module is turned on, the second diode connected to the standby dc power supply module is turned off, and at this time, the main dc 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 of the main direct current power supply module is lower than the output voltage of the backup direct current power supply module, at the moment, the first diode of the load equipment, which is connected with the main direct current power supply module, is cut off, the second diode of the load equipment, which is 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 the first input end a and the second input end B, and only one of the input ends needs to be ensured to obtain normal power supply in the using process, so that the load device can normally operate. For example, in the load device in the embodiment of the present application, when the load device is in normal use, each of the two input terminals a and B takes on 50% of power supply, and when one of the input terminals fails, the remaining input terminal provides 100% of power, thereby improving the reliability of power supply. For the dual-path dc-powered load devices, the output terminal of each main dc-powered module 40 is connected to the first input terminal a and the second input terminal B of the corresponding load device 30 through a first diode D1, and the output terminal of each backup dc-powered module 50 is connected to the first input terminal a and/or the second input terminal B of each load device through a second diode D2.
In an actual scenario, for any backup dc power supply module, whether its output terminal is connected to both input terminals of the load device through the second diode simultaneously or connected 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 an N +1 architecture, that is, the number of the primary dc power supply modules 40 is N, and the number of the backup dc power supply modules 50 is one, the output terminal of each backup dc power supply module 50 is connected to the first input terminal a and the second input terminal 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 operate normally.
For example, when the dc power supply system adopts an N +2 architecture, that is, the number of the primary dc power supply modules 40 is N, and the number of the backup dc power supply modules 50 is two, the output terminal of each backup dc power supply module 50 is connected to one output terminal 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, respectively, an output end of the first backup dc power supply module 501 is connected to a first input end a of each load device through a second diode D2, and an output end of the second backup dc power supply module 502 is connected to a second input end B of each load device through a second diode D2.
Compared with the dc power supply system with the N +1 architecture, the dc 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 to be larger, and at this time, the balance between availability and cost can be achieved, and when the number of load devices is larger, the comprehensive cost is lower compared with the N +1 architecture.
Fig. 7 shows a DC common backup power supply system using the principle of the solution of the embodiment of the present application, the power supply system includes 1 backup DC power supply module 50 and two main DC power supply modules 40, wherein 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 commercial power 60, an output end of the AC/DC conversion module 41 is connected to the power supply battery 42, the output DC power is used for charging the power supply battery 42, and the power supply battery 42 directly hangs up the first output bus 10 as the output end of the whole main DC power supply module 40. The output voltage when the mains power input is 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 charging and discharging control module 53, wherein the input end of the AC/DC conversion module 51 is connected with a commercial power 60, the output end of the AC/DC conversion module is connected with the power supply battery 52, direct current is output to charge the power supply battery 52, the power supply battery 52 is hung on the second output bus 20 through the DC/DC bidirectional charging and discharging control module 53 and serves as the output end of the whole main direct current power supply module 50, and therefore the output voltage can be stably maintained at 240V at any time.
The load device in this embodiment is a dual power supply server, and its corresponding input terminals are two Power Distribution Units (PDUs), and each power distribution unit is connected to the corresponding active dc power supply module 40 and the backup dc power supply module 50 through the first diode D1 and the second diode D2, respectively, where the anode of the diode is connected to the active 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 units, so the cathodes of the two diodes are connected and have the same potential. In the switching process, the principle that when the anode voltage of the diode is greater than the cathode voltage, the diode is conducted, otherwise, the diode is cut off is utilized, and therefore the rapid switching between the main direct current power supply module and the standby direct current power supply module is achieved. Table 2 below shows the operation mode of the dc common backup power supply system in fig. 7, and fig. 8 shows the timing chart when the relevant operation mode is switched.
Figure BDA0002692884400000101
Figure BDA0002692884400000111
TABLE 2
In summary, in the solution provided in the embodiment of the present application, by using the characteristics of turning on and off of a diode, 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 a conducting state, the second diode is in a stopping state, and 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 stopping state, the backup direct current power supply module supplies power to the load equipment, and the switching speed of the conducting state and the stopping state of the diode is high, so that the millisecond level can be reached, and the switching performance of the diode and the STS in the alternating current system can reach the same level.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall 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 this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. 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 (10)

1. A direct current power supply system, characterized in that the power supply system comprises:
the output end of each main direct current power supply module is connected with the input end of corresponding load equipment 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 each load equipment 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, 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;
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 stopping state, and the main direct current power supply module supplies power to the load equipment; when the output voltage of the main direct current power supply module is lower than the output voltage of the backup direct current power supply module, the second diode is in a conducting state, the first diode is in a stopping state, and the backup direct current power supply module supplies power to the load equipment.
2. The power supply system of claim 1, wherein the primary dc power supply module comprises a dc power supply module and a power supply battery, an input terminal of the dc power supply module is connected to a power supply for providing power input, and an output terminal of the dc power supply module is connected to 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 discharge state, and the power supply battery provides power output.
3. The power supply system of claim 1, wherein the backup DC power supply module comprises a DC power supply module, a DC/DC charging and discharging control module, and a power supply battery, wherein an input end of the DC power supply module is connected to a power supply for providing power input, and an output end of the DC power supply module is connected to the power supply battery through the DC/DC bidirectional charging and discharging control module;
when the power input of the backup direct current power supply module is normal, a 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 charging and discharging control module controls the output voltage to keep a second voltage value.
4. The system according to claim 1, wherein the input terminals of the load devices include a first input terminal and a second input terminal, the output terminal of each active dc power supply module is connected to the first input terminal and the second input terminal of the corresponding load device through a first diode, respectively, and the output terminal of each backup dc power supply module is connected to the first input terminal and/or the second input terminal of each load device through a second diode, respectively.
5. The system of claim 4, wherein the number of the backup DC power supply modules is one, and the output terminal of each backup DC power supply module is connected to the first input terminal and the second input terminal of each load device through a second diode respectively.
6. The system according to claim 5, wherein the number of the active DC power supply modules is greater than or equal to 2.
7. The system of claim 4, wherein the number of the backup DC power supply modules is two, and the backup DC power supply modules include a first backup DC power supply module and a second backup DC power supply module, wherein an output terminal of the first backup DC power supply module is connected to the first input terminal of each load device through a second diode, and an output terminal of the second backup DC power supply module is connected to the second input terminal of each load device through a second diode.
8. The system according to claim 7, wherein the number of the active dc power modules is greater than or equal to 2.
9. The system of claim 4, wherein the input of the load device is two power distribution units.
10. The system of claim 1, wherein the first voltage value is 270V and the second voltage value is 240V.
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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
CN107769364A (en) * 2016-08-17 2018-03-06 阿里巴巴集团控股有限公司 The electric power system and method for supplying power to of computer room

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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
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