A direct current power supply device and a direct current power supply system

Abstract

The utility model provides a kind of DC power supply device and DC power supply system, the DC power supply device includes: power conversion module and power supply module, power conversion module is connected with power supply module by total DC bus;The power conversion module is used to convert external AC into first DC output;The power supply module is used to receive the first DC and power supply for load;The power conversion module includes K conversion output units, K The conversion output unit is connected with the power supply module by the total DC bus after being connected in series, the output voltage of single conversion output unit is nominal voltage;The voltage of the total DC bus is equal to the output voltage of the power conversion module;Wherein, the standard output voltage of the power conversion module is K times of nominal voltage, K is greater than or equal to 2 positive integer.The DC power supply device and DC power supply system provided by the utility model embodiment reduce DC distribution cost.

Description

Technical Field

[0001] This utility model relates to the field of power supply equipment technology, specifically to a DC power supply device and a DC power supply system. Background Technology

[0002] In existing technologies, such as Figure 1 As shown, the DC power supply system of a data center includes an AC / DC converter and a Power Supply Unit (PSU). The AC / DC converter is connected to the PSU via a DC bus. The AC / DC converter converts AC mains power into DC power, which is then supplied to the PSU via the DC bus. The output DC voltage of the AC / DC converter in the DC power supply system is typically selected based on the voltage range provided by industry standards for DC power supply in data centers. However, since downstream electrical equipment such as power distribution switches, cables, and server power supplies all need to meet their corresponding operating voltages, power distribution switches and cables must be selected based on the lowest operating voltage. For the same system power, the lower the output voltage, the greater the current, the larger the switch capacity, and the thicker the cable, resulting in higher costs for the downstream DC power distribution system. Simultaneously, a larger bus current also increases cable power consumption, leading to energy waste. Therefore, reducing power supply costs has become a crucial issue that urgently needs to be addressed in this field. Utility Model Content

[0003] In view of the problems in the prior art, the present invention provides a DC power supply device and a DC power supply system, which can at least partially solve the problems existing in the prior art.

[0004] In a first aspect, this utility model proposes a DC power supply device for a data center, comprising a power conversion module and a power supply module, wherein:

[0005] The power conversion module and the power supply module are connected via the main DC bus;

[0006] The power conversion module is used to convert external AC power into a first DC power output; the power supply module is used to receive the first DC power and supply power to the load.

[0007] The power conversion module includes K conversion output units, which are connected in series and then connected to the power supply module through the main DC bus. The output voltage of a single conversion output unit is the nominal voltage.

[0008] The voltage of the total DC bus is equal to the output voltage of the power conversion module; where the standard output voltage of the power conversion module is K times the nominal voltage, and K is a positive integer greater than or equal to 2.

[0009] Furthermore, the power supply module includes K first power supply units;

[0010] K first power supply units are connected in series. Two adjacent first power supply units share a common connection line. One end of the common connection line is connected to the connection midpoint of two adjacent first power supply units, and the other end of the common connection line is connected to the connection midpoint of two adjacent conversion output units.

[0011] There is one public connection line, K-1.

[0012] The input voltage of each first power supply unit is the nominal voltage.

[0013] Furthermore, the power supply module includes a second power supply unit;

[0014] The K conversion output units are connected in series and then connected to the second power supply unit via the main DC bus. The input voltage of the second power supply unit is k times the nominal voltage.

[0015] Furthermore, the power conversion module includes at least one first AC / DC converter, and the conversion output unit is a first DC / DC converter, wherein:

[0016] Each first AC / DC converter corresponds to at least one first DC / DC converter, and each first DC / DC converter is connected in parallel with the output of the corresponding first AC / DC converter.

[0017] The first AC / DC converter is used to convert external AC power into a second DC power, and the first DC / DC converter is used to convert the second DC power into a first DC power output.

[0018] Furthermore, the output conversion unit is a second AC / DC converter, which is used to convert the external AC power into the first DC power output.

[0019] Furthermore, the power conversion module also includes K first capacitors;

[0020] The K first capacitors are connected one-to-one with the K conversion output units, and the K first capacitors are connected in series.

[0021] Furthermore, the DC power supply device provided in this embodiment of the present invention also includes an energy storage module, which is connected to the power conversion module.

[0022] Furthermore, the power conversion module also includes K second DC / DC converters;

[0023] K second DC / DC converters are connected in series;

[0024] The first terminals of the K second DC / DC converters are connected to the energy storage module. The K second DC / DC converters are connected one-to-one with the K conversion output units. The output terminals of the second DC / DC converters and the conversion output units are connected in parallel.

[0025] Furthermore, the power conversion module also includes K second capacitors;

[0026] K second capacitors are connected one-to-one with K second DC / DC converters, and the second capacitors are connected in parallel to the second terminal of the second DC / DC converter, and the K second capacitors are connected in series.

[0027] Furthermore, the number of power conversion modules is N, where N is an integer greater than or equal to 1;

[0028] When N is greater than 1, the input terminals of multiple power conversion modules are connected to an external AC power supply, the output terminals of multiple power conversion modules are connected to the main DC bus, and the multiple power conversion modules are connected in parallel.

[0029] Furthermore, the number of power supply modules is M, where M is a positive integer greater than or equal to 1;

[0030] When M is greater than 1, the input terminals of multiple power supply modules are connected to the main DC bus, and the multiple power supply modules are connected in parallel.

[0031] Secondly, this utility model proposes a DC power supply system, including multiple DC power supply devices of any of the above embodiments connected in parallel.

[0032] The DC power supply device and system provided in this embodiment include a power conversion module and a power supply module, which are connected to each other via a main DC bus. The power conversion module converts external AC power into a first DC power output. The power supply module receives the first DC power and supplies power to the load. The power conversion module includes K conversion output units, which are connected in series to the power supply module via the main DC bus. The output voltage of a single conversion output unit is the nominal voltage. The voltage of the main DC bus is equal to the output voltage of the power conversion module. The standard output voltage of the power conversion module is K times the nominal voltage, where K is a positive integer greater than or equal to 2. By reducing the current of the main DC bus and reducing the power consumption of the cables, the cost of DC power supply is reduced. Furthermore, the DC power supply system provided in this application is compatible with two types of power supply units, making it more widely applicable. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings:

[0034] Figure 1 This is a schematic diagram of the existing DC power supply system.

[0035] Figure 2 This is a schematic diagram of the DC power supply device provided in the first embodiment of this utility model.

[0036] Figure 3 This is a schematic diagram of the DC power supply device provided in the second embodiment of this utility model.

[0037] Figure 4 This is a schematic diagram of the DC power supply device provided in the third embodiment of this utility model.

[0038] Figure 5 This is a schematic diagram of the DC power supply device provided in the fourth embodiment of this utility model.

[0039] Figure 6 This is a schematic diagram of the DC power supply device provided in the fifth embodiment of this utility model.

[0040] Figure 7 This is a schematic diagram of the DC power supply device provided in the sixth embodiment of this utility model.

[0041] Figure 8 This is a schematic diagram of the DC power supply device provided in the seventh embodiment of this utility model.

[0042] Figure 9 This is a schematic diagram of the DC power supply device provided in the eighth embodiment of this utility model.

[0043] Figure 10 This is a schematic diagram of the DC power supply device provided in the ninth embodiment of this utility model.

[0044] Figure 11 This is a schematic diagram of the DC power supply device provided in the tenth embodiment of this utility model.

[0045] Figure 12 This is a schematic diagram of the DC power supply device provided in the eleventh embodiment of this utility model.

[0046] Figure 13 This is a schematic diagram of the DC power supply device provided in the twelfth embodiment of the present invention.

[0047] Figure 14 This is a schematic diagram of the DC power supply device provided in the thirteenth embodiment of this utility model.

[0048] Figure 15 This is a schematic diagram of the DC power supply device provided in the fourteenth embodiment of this utility model.

[0049] Figure 16 This is a schematic diagram of the DC power supply device provided in the fifteenth embodiment of this utility model.

[0050] Figure 17 This is a schematic diagram of the DC power supply device provided in the sixteenth embodiment of this utility model.

[0051] Figure 18 This is a schematic diagram of the DC power supply device provided in the seventeenth embodiment of the present invention.

[0052] Figure 19 This is a schematic diagram of the DC power supply device provided in the eighteenth embodiment of this utility model.

[0053] Figure 20 This is a schematic diagram of the DC power supply device provided in the nineteenth embodiment of this utility model.

[0054] Figure 21 This is a schematic diagram of the DC power supply device provided in the twentieth embodiment of the present invention.

[0055] Figure 22 This is a schematic diagram of the DC power supply device provided in the twenty-first embodiment of this utility model.

[0056] Figure 23 This is a schematic diagram of the DC power supply device provided in the twenty-second embodiment of this utility model.

[0057] Figure 24 This is a schematic diagram of the DC power supply device provided in the twenty-third embodiment of this utility model.

[0058] Figure 25 This is a schematic diagram of the DC power supply device provided in the twenty-fourth embodiment of this utility model.

[0059] Figure 26 This is a schematic diagram of the DC power supply device provided in the twenty-fifth embodiment of this utility model.

[0060] Figure 27 This is a schematic diagram of the DC power supply device provided in the twenty-sixth embodiment of this utility model.

[0061] Figure 28 This is a schematic diagram of the DC power supply device provided in the twenty-seventh embodiment of this utility model.

[0062] Figure 29 This is a schematic diagram of the DC power supply device provided in the twenty-eighth embodiment of this utility model.

[0063] Figure 30 This is a schematic diagram of the DC power supply device provided in the twenty-ninth embodiment of this utility model.

[0064] Figure 31 This is a schematic diagram of the DC power supply device provided in the thirtieth embodiment of this utility model.

[0065] Figure 32 This is a schematic diagram of the DC power supply device provided in the thirty-first embodiment of this utility model.

[0066] Figure 33 This is a schematic diagram of the DC power supply device provided in the thirty-second embodiment of this utility model.

[0067] Figure 34 This is a schematic diagram of the DC power supply system provided in the twenty-third embodiment of this utility model. Detailed Implementation

[0068] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. Here, the illustrative embodiments and descriptions of this utility model are used to explain this utility model, but are not intended to limit this utility model. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be arbitrarily combined with each other. The acquisition, storage, use, and processing of data in the technical solutions of this application all comply with the relevant provisions of laws and regulations. The user information in the embodiments of this application is obtained through legal and compliant means, and the acquisition, storage, use, and processing of user information have been authorized and agreed upon by the customer.

[0069] To facilitate understanding of the technical solution provided in this application, the relevant content of the technical solution in this application will be explained below.

[0070] To reduce power supply costs, this application proposes a DC power supply device that increases the bus voltage and reduces the bus current by increasing the output voltage of the power conversion module, thereby reducing cable losses. Because the output voltage is increased, the current decreases, resulting in smaller switching capacity and thinner cables, which in turn lowers the cost and reduces losses in the downstream DC power distribution system.

[0071] Furthermore, in existing technologies, energy storage batteries are directly connected in parallel to the main DC bus. When the load changes, there are situations where the energy storage battery discharges to the load and the AC / DC converter charges the energy storage battery, which increases the number of charge-discharge cycles and reduces the lifespan of the energy storage battery.

[0072] Figure 2 This is a schematic diagram of the structure of a DC power supply device provided in the first embodiment of this utility model. Figure 3 This is a schematic diagram of the DC power supply device provided in the second embodiment of this utility model, as shown below. Figure 2 and Figure 3 As shown, the DC power supply device provided in this embodiment of the present invention includes a power conversion module 1 and a power supply module 2, wherein:

[0073] Power conversion module 1 and power supply module 2 are connected via the main DC bus 3;

[0074] Power conversion module 1 is used to convert external AC power into a first DC power output; power supply module 2 is used to receive the first DC power and supply power to the load;

[0075] The power conversion module 1 includes K conversion output units 102. The K conversion output units 102 are connected in series and then connected to the power supply module 2 through the main DC bus 3. The output voltage of a single conversion output unit 102 is the nominal voltage.

[0076] The voltage of the main DC bus 3 is equal to the output voltage of the power conversion module 1; wherein, the standard output voltage of the power conversion module 1 is K times the nominal voltage, and K is a positive integer greater than or equal to 2.

[0077] Specifically, the power conversion module 1 is connected to external AC power and converts the AC power into a first DC power. The first DC power is transmitted to the power supply module 2 through the main DC bus. The power supply module 2 receives the first DC power and then supplies power to the load. The standard output voltage of the power conversion module 1 is K times the nominal voltage. The nominal voltage is, for example, within the range of 200-288V specified in "YD / T2378-2020 240V DC Power Supply System for Communication", or within the range of 270-400V specified in "YD / T 3089 336V DC Power Supply System for Communication".

[0078] The power conversion module 1 includes K conversion output units 102, which are connected in series to the power supply module 2 via a main DC bus 3. The output voltage of a single conversion output unit 102 is the nominal voltage. The voltage of the main DC bus 3 is equal to the output voltage of the power conversion module 1.

[0079] Because of the increased standard output voltage of power conversion module 1, the current in the total DC bus 3 can be reduced for the same system power, thus reducing cable power consumption and lowering DC power supply costs. Furthermore, the increased output voltage of the DC power supply system results in lower current, which helps reduce the cost of downstream DC distribution systems.

[0080] For example, such as Figure 2 As shown, the power conversion module 1 includes two conversion output units 102, which are connected in series and then connected to the power supply module 2 via the main DC bus 3. The output voltage of each conversion output unit 102 is equal to the nominal voltage, the voltage of the main DC bus 3 is twice the nominal voltage, and the input voltage of the power supply module 2 is twice the nominal voltage.

[0081] For example, such as Figure 3 As shown, the power conversion module 1 includes three conversion output units 102, which are connected in series and then connected to the power supply module 2 via the main DC bus 3. The output voltage of each conversion output unit 102 is equal to the nominal voltage, the voltage of the main DC bus 3 is three times the nominal voltage, and the input voltage of the power supply module 2 is three times the nominal voltage.

[0082] The DC power supply device provided in this embodiment includes a power conversion module and a power supply module, which are connected via a main DC bus. The power conversion module converts external AC power into a first DC power output. The power supply module receives the first DC power and supplies power to the load. The power conversion module includes K conversion output units, which are connected in series to the power supply module via the main DC bus. The output voltage of a single conversion output unit is its nominal voltage. The voltage of the main DC bus is equal to the output voltage of the power conversion module. The standard output voltage of the power conversion module is K times its nominal voltage, where K is a positive integer greater than or equal to 2. By reducing the current to the main DC bus and decreasing cable power consumption, the cost of DC power supply is reduced. Furthermore, the DC power supply system provided in this application is compatible with both power supply units, making it more widely applicable.

[0083] Figure 4 This is a schematic diagram of the DC power supply device provided in the third embodiment of this utility model. Figure 5 This is a structural schematic diagram of the DC power supply device provided in the fourth embodiment of this utility model, as shown below. Figure 4 and Figure 5 As shown, the power supply module 2 includes K first power supply units;

[0084] K first power supply units are connected in series. Two adjacent first power supply units share a common connection line 4. One end of the common connection line 4 is connected to the connection midpoint of two adjacent first power supply units, and the other end of the common connection line 4 is connected to the connection midpoint of two adjacent conversion output units.

[0085] There is one public connection line, K-1.

[0086] The input voltage of each first power supply unit is the nominal voltage.

[0087] Specifically, the standard output voltage of power conversion module 1 is K times the nominal voltage, the voltage of the total DC bus 3 is equal to the output voltage of power conversion module 1, and the input voltage of each first power supply unit is the nominal voltage. Two adjacent first power supply units share a common connection line 4. Each first power supply unit may include multiple power supply sub-units connected in parallel.

[0088] The bus voltage on the total DC bus 3 is K times the nominal voltage. The first power supply unit 201 can use a conventional PSU, which is equivalent to increasing the total bus voltage while maintaining compatibility with the input voltage level of a conventional PSU, thus reducing the bus equivalent current and lowering line losses. Furthermore, for two adjacent first power supply units, since they share a common connection line 4, which serves as both the positive bus of one first power supply unit and the negative bus of the other, high-voltage DC currents in opposite directions exist on the common connection line 4. These currents can cancel each other out, further reducing cable power consumption.

[0089] While existing technologies can increase the bus voltage for power supply, they are incompatible with the input voltage of traditional PSUs. However, this invention allows for the use of traditional PSUs even after increasing the total DC bus voltage, thus reducing power supply costs while maintaining compatibility with existing PSUs.

[0090] For example, such as Figure 4 As shown, the standard output voltage of power conversion module 1 is twice the nominal voltage, and the input voltages of the first power supply unit 201-1 and the first power supply unit 201-2 are the nominal voltages. The positive input terminal of the first power supply unit 201-1 is connected to the positive DC bus 3-1, and the negative input terminal of the first power supply unit 201-1 is connected to the common connection line 4. The positive input terminal of the first power supply unit 201-2 is connected to the common connection line 4, and the negative input terminal of the first power supply unit 201-2 is connected to the negative DC bus 3-2.

[0091] The positive DC bus 3-1 is a positive bus to the common connection line 4, which can be considered as the negative bus to the first power supply unit 201-1; the common connection line 4 is a positive bus to the negative DC bus 3-2, which can be considered as the positive bus to the first power supply unit 201-2. This application eliminates the need to connect the positive and negative DC buses (a total of four cables) to the first power supply units 201-1 and 201-2 separately. Only the positive DC bus, negative DC bus, and common connection line (three cables) are needed to connect the power conversion module 1 to the two first power supply units (201-1 and 201-2), saving 25% of the cabling, reducing costs, and lowering losses. The bus voltages of the positive DC bus 3-1 and the negative DC bus 3-2 can be twice the nominal voltage. Furthermore, the first power supply units 201-1 and 201-2 can be conventional PSUs, effectively increasing the total bus voltage while maintaining compatibility with conventional PSU input voltage levels. This reduces the equivalent bus current and thus lowers losses. Additionally, for the positive DC bus 3-1, the current direction on the common connection line 4 flows from the first power supply unit 201-1 to the power conversion module 1; for the negative DC bus 3-2, the current direction on the common connection line 4 flows from the power conversion module 1 to the first power supply unit 201-2. The presence of two opposite and equal DC currents on the common connection line 4 cancels each other out, further reducing cable power consumption.

[0092] For example, such as Figure 5 As shown, the standard output voltage of power conversion module 1 is three times the nominal voltage. The input voltages of the first power supply units 201-1, 201-2, and 201-3 are the nominal voltages. The positive input terminal of the first power supply unit 201-1 is connected to the positive DC bus 3-1, and the negative input terminal is connected to the common connection line 4-1. The positive input terminal of the first power supply unit 201-2 is connected to the common connection line 4-1, and the negative input terminal is connected to the common connection line 4-2. The positive input terminal of the first power supply unit 201-3 is connected to the common connection line 4-2, and the negative input terminal is connected to the negative DC bus 3-2.

[0093] The positive DC bus 3-1 is a positive bus to the common connection line 4-1, and the common connection line 4-1 can be regarded as the negative bus to the first power supply unit 201-1; the common connection line 4-1 is a positive bus to the common connection line 4-2, and the common connection line 4-2 is a negative bus to the common connection line 4-1, and the common connection line 4-1 can be regarded as the positive bus to the first power supply unit 201-2, and the common connection line 4-2 can be regarded as the negative bus to the first power supply unit 201-2; the common connection line 4-2 is a positive bus to the negative DC bus 3-2, and the common connection line 4-2 can be regarded as the positive bus to the first power supply unit 201-3. This application eliminates the need to connect the positive and negative DC buses (a total of six cables) to the first power supply units 201-1, 201-2, and 201-3 separately. Instead, it uses only the positive main DC bus, the negative main DC bus, and a common connection line (a total of four cables) to connect the power conversion module 1 to the three first power supply units (201-1, 201-2, and 201-3), saving 33% of the cabling and reducing costs while minimizing losses. The bus voltages of the positive main DC bus 3-1 and the negative main DC bus 3-2 can be three times the nominal voltage. Furthermore, the first power supply units 201-1, 201-2, and 201-3 can be conventional PSUs, effectively increasing the total bus voltage while maintaining compatibility with conventional PSU input voltage levels. This reduces the equivalent bus current and thus lowers losses. Furthermore, for the positive DC bus 3-1, the current direction on the common connection line 4-1 flows from the first power supply unit 201-1 to the power conversion module 1; for the common connection line 4-2, the current direction on the common connection line 4-1 flows from the power conversion module 1 to the first power supply unit 201-2. There are two DC currents of opposite directions and equal magnitude on the common connection line 4-1, which can cancel each other out, further reducing the power consumption of the cable. For the common connection line 4-1, the current direction on the common connection line 4-2 flows from the first power supply unit 201-2 to the power conversion module 1; for the negative DC bus 3-2, the current direction on the common connection line 4-2 flows from the power conversion module 1 to the first power supply unit 201-3. There are two DC currents of opposite directions and equal magnitude on the common connection line 4-2, which can cancel each other out, further reducing the power consumption of the cable.

[0094] Figure 6 This is a schematic diagram of the DC power supply device provided in the fifth embodiment of this utility model. Figure 7 This is a schematic diagram of the DC power supply device provided in the sixth embodiment of this utility model, as shown below. Figure 6 and Figure 7As shown, based on the above embodiments, the power supply module 2 further includes a second power supply unit 202;

[0095] The K conversion output units are connected in series and then connected to the second power supply unit 202 through the main DC bus. The input voltage of the second power supply unit 202 is k times the nominal voltage.

[0096] For example, such as Figure 6 As shown, the power conversion module 1 includes a conversion output unit 102-1 and a conversion output unit 102-2. Conversion output units 102-1 and 102-2 are connected in series and then connected to the second power supply unit 202 via main DC buses 3-1 and 3-2. The power supply module 2 includes one second power supply unit 202. The standard output voltage of the power conversion module 1 is twice the nominal voltage, and the input voltage of the second power supply unit 202 is equal to twice the nominal voltage.

[0097] For example, such as Figure 7 As shown, the power conversion module 1 includes conversion output units 102-1, 102-2, and 102-3. The power supply module 2 includes a second power supply unit 202. Conversion output units 102-1, 102-2, and 102-3 are connected in series and then connected to the second power supply unit 202 via the main DC bus 3-1 and 3-2. The standard output voltage of the power conversion module 1 is three times the nominal voltage, and the input voltage of the second power supply unit 202 is equal to three times the nominal voltage. Specifically, the second power supply unit can be a non-traditional high-voltage PSU, i.e., a PSU with a higher input voltage level than a traditional PSU.

[0098] This embodiment of the invention improves the total DC bus voltage while also being compatible with high-voltage PSUs with higher input voltage levels. It offers low power supply costs and is applicable to a wide range of scenarios.

[0099] like Figures 8 to 13 As shown, based on the above embodiments, the power conversion module 1 further includes at least one first AC / DC converter 101, and the conversion output unit is a first DC / DC converter, wherein:

[0100] Each first AC / DC converter 101 corresponds to at least one first DC / DC converter 102, and each first DC / DC converter 102 is connected in parallel with the output terminal of the corresponding first AC / DC converter 101.

[0101] The first AC / DC converter 101 is used to convert external AC power into a second DC power, and the first DC / DC converter 102 is used to convert the second DC power into a first DC power output. The first AC / DC converter 101 may include multiple first AC / DC sub-converters connected in parallel; each first DC / DC converter 102 may include multiple first DC / DC sub-converters connected in parallel.

[0102] For example, such as Figure 8 As shown, the power conversion module 1 includes one first AC / DC converter 101 and two first DC / DC converters 102, with each first DC / DC converter 102 connected in parallel to the output terminal of the AC / DC converter 101. The standard output voltage of the power conversion module 1 is twice the nominal voltage, the output voltage of each first DC / DC converter 102 is the nominal voltage, and the voltage of the total DC bus 3 can be equal to twice the nominal voltage. The power supply module 2 is connected to the total DC bus.

[0103] For example, such as Figure 9 As shown, the power conversion module 1 includes a first AC / DC converter 101, a first DC / DC converter 102-1, and a first DC / DC converter 102-2; the first DC / DC converters 102-1 and 102-2 are connected in parallel at the output of the first AC / DC converter 101-1; the standard output voltage of the power conversion module 1 is twice the nominal voltage, the output voltage of each first DC / DC converter is the nominal voltage, and the voltage of the total DC bus 3-1 and 3-2 is equal to twice the nominal voltage. The power supply module 2 includes a first power supply unit 201-1 and a first power supply unit 201-2, which are connected in series, and the input voltage of the first power supply units 201-1 and 201-2 is the nominal voltage. The positive input terminal of the first power supply unit 201-1 is connected to the positive DC bus 3-1, and the negative input terminal of the first power supply unit 201-1 is connected to the common connection line 4. The positive input terminal of the first power supply unit 201-2 is connected to the common connection line 4, and the negative input terminal of the first power supply unit 201-2 is connected to the negative DC bus 3-2.

[0104] For example, such as Figure 10As shown, the power conversion module 1 includes a first AC / DC converter 101, a first DC / DC converter 102-1, and a first DC / DC converter 102-2; the first DC / DC converters 102-1 and 102-2 are connected in parallel to the output of the first AC / DC converter 101-1; the standard output voltage of the power conversion module 1 is twice the nominal voltage, the output voltage of each first DC / DC converter is the nominal voltage, and the voltage of the total DC bus 3 is equal to twice the nominal voltage. The power supply module 2 includes a second power supply unit 202, the input of which is connected to the total DC bus 3, and the input voltage of the second power supply unit 202 is twice the nominal voltage.

[0105] For example, such as Figure 11 As shown, the power conversion module 1 includes a first AC / DC converter 101 and three first DC / DC converters 102. The three first DC / DC converters 102 are connected in parallel to the output terminals of the first AC / DC converter 101. The three first DC / DC converters 102 are connected in series and then connected to the power supply module 2 via a total DC bus 3. The standard output voltage of the power conversion module 1 is three times the nominal voltage, the output voltage of each first DC / DC converter is the nominal voltage, and the voltage of the total DC bus 3 is equal to three times the nominal voltage. The input voltage of the power supply module 2 is three times the nominal voltage.

[0106] For example, such as Figure 12 As shown, the power conversion module 1 includes a first AC / DC converter 101 and three first DC / DC converters, and the power supply module 2 includes three first power supply units; the first DC / DC converters 102-1, 102-2, and 102-3 are connected in parallel to the output terminal of the first AC / DC converter 101; the first power supply units 201-1, 201-2, and 201-3 are connected in series.

[0107] The first DC / DC converter 102-1 is connected to the first power supply unit 201-1 via the main DC bus 3-1 and the common connection line 4-1; the first DC / DC converter 102-2 is connected to the first power supply unit 201-2 via the common connection lines 4-1 and 4-2; the first DC / DC converter 102-3 is connected to the first power supply unit 201-3 via the common connection line 4-2 and the main DC bus 3-2. The standard output voltage of the power conversion module 1 is three times the nominal voltage, and the voltage of the main DC bus 3 is equal to the output voltage of the power conversion module 1. The output voltages of the first DC / DC converters 102-1, 102-2, and 102-3 are equal to the nominal voltages. The input voltages of the first power supply units 201-1, 201-2, and 201-3 are equal to the nominal voltages.

[0108] For example, such as Figure 13 As shown, the power conversion module 1 includes a first AC / DC converter 101 and three first DC / DC converters, and the power supply module 2 includes a second power supply unit 202. The first DC / DC converters 102-1, 102-2, and 102-3 are connected in parallel to the output of the first AC / DC converter 101; the first DC / DC converters 102-1, 102-2, and 102-3 are connected in series. The standard output voltage of the power conversion module 1 is three times the nominal voltage, the output voltage of each first DC / DC converter is the nominal voltage, and the voltage of the total DC buses 3-1 and 3-2 is equal to three times the nominal voltage. The second power supply unit 202 is connected to the total DC buses 3-1 and 3-2, and the input voltage of the second power supply unit 202 is three times the nominal voltage.

[0109] For example, such as Figure 14 As shown, the power conversion module 1 includes a first AC / DC converter 101-1, a first AC / DC converter 101-2, a first DC / DC converter 102-1, a first DC / DC converter 102-2, and a first DC / DC converter 102-3. The first DC / DC converters 102-1 and 102-2 are connected in parallel to the output of the first AC / DC converter 101-1, and the first DC / DC converter 102-3 is connected to the output of the first AC / DC converter 101-2. The standard output voltage of the power conversion module 1 is three times the nominal voltage, the output voltage of each first DC / DC converter is the nominal voltage, and the voltage of the total DC bus 3 is equal to three times the nominal voltage. The power supply module 2 is connected to the total DC bus 3, and the input voltage of the power supply module 2 is equal to three times the nominal voltage.

[0110] like Figures 15 to 20 As shown, based on the above embodiments, the output conversion unit is further configured as a second AC / DC converter, which converts the external AC power into a first DC power output. The number of second AC / DC converters is set according to actual needs and is not limited in this embodiment. The second AC / DC converter may include multiple second AC / DC sub-converters connected in parallel.

[0111] The power supply module 2 may include one second power supply unit, the standard input voltage of which is equal to K times the nominal voltage, or the power supply module 2 may include multiple first power supply units connected in series, the standard input voltage of which is equal to the nominal voltage.

[0112] For example, such as Figure 15 As shown, the power conversion module includes two second AC / DC converters 103. The standard output voltage of the power conversion module 1 is twice the nominal voltage, and the output voltage of each second AC / DC converter 103 is the nominal voltage. The voltage of the total DC bus 3 is equal to twice the nominal voltage. The power supply module 2 is connected to the total DC bus 3, and the input voltage of the power supply module 2 is equal to twice the nominal voltage.

[0113] For example, such as Figure 16 As shown, the power conversion module includes a second AC / DC converter 103-1 and a second AC / DC converter 103-2, and the power supply module 2 includes a first power supply unit 201-1 and a first power supply unit 201-2. The output terminal of the second AC / DC converter 103-1 is connected to the input terminal of the first power supply unit 201-1 via a main DC bus 3-1 and a common connection line 4. The output terminal of the second AC / DC converter 103-2 is connected to the input terminal of the first power supply unit 201-2 via a main DC bus 3-2 and a common connection line 4. The standard output voltage of the power conversion module 1 is twice the nominal voltage, and the output voltages of the second AC / DC converter 103-1 and the second AC / DC converter 103-2 are the nominal voltages. The input voltages of the first power supply units 201-1 and 201-2 are the nominal voltages.

[0114] For example, such as Figure 17As shown, the power conversion module includes a second AC / DC converter 103-1 and a second AC / DC converter 103-2, and the power supply module 2 includes a second power supply unit 202. The second AC / DC converter 103-1 and the second AC / DC converter 103-2 are connected in series and then connected to the second power supply unit 202 via the main DC buses 3-1 and 3-2. The standard output voltage of the power conversion module 1 is twice the nominal voltage. The voltage of the main DC buses 3-1 and 3-2 is also twice the nominal voltage. The second power supply unit 202 is connected to the main DC buses 3-1 and 3-2, and the input voltage of the second power supply unit 202 is twice the nominal voltage.

[0115] For example, such as Figure 18 As shown, the power conversion module 1 includes three second AC / DC converters 103, which are connected in series and then connected to the power supply module 2 via the main DC bus 3. The standard output voltage of the power conversion module 1 is three times the nominal voltage, and the output voltage of each second AC / DC converter 103 is the nominal voltage. The voltage of the main DC bus 3 is three times the nominal voltage. The input voltage of the power supply module 2 is three times the nominal voltage.

[0116] For example, such as Figure 19 As shown, the power conversion module 1 includes three second AC / DC converters, and the power supply module 2 includes three first power supply units; the second AC / DC converters 103-1, 103-2, and 103-3 are connected in series; the first power supply units 201-1, 201-2, and 201-3 are connected in series.

[0117] The second AC / DC converter 103-1 is connected to the first power supply unit 201-1 via the main DC bus 3-1 and the common connection line 4-1; the second AC / DC converter 103-2 is connected to the first power supply unit 201-2 via the common connection lines 4-1 and 4-2; the second AC / DC converter 103-3 is connected to the first power supply unit 201-3 via the common connection line 4-2 and the main DC bus 3-2. The standard output voltage of the power conversion module 1 is three times the nominal voltage, and the voltage of the main DC bus 3 is equal to the output voltage of the power conversion module 1. The output voltages of the second AC / DC converters 103-1, 103-2, and 103-3 are equal to the nominal voltages. The input voltages of the first power supply units 201-1, 201-2, and 201-3 are equal to the nominal voltages.

[0118] For example, such as Figure 20As shown, the power conversion module 1 includes three second AC / DC converters, and the power supply module 2 includes one second power supply unit 202. The second AC / DC converters 103-1, 103-2, and 103-3 are connected in series and then connected to the second power supply unit 202 via the main DC buses 3-1 and 3-2. The standard output voltage of the power conversion module 1 is three times the nominal voltage, the output voltage of each first DC / DC converter is the nominal voltage, and the voltage of the main DC buses 3-1 and 3-2 is equal to three times the nominal voltage. The input voltage of the second power supply unit 202 is three times the nominal voltage.

[0119] Based on the above embodiments, the power conversion module 1 further includes K first capacitors;

[0120] K first capacitors are connected one-to-one with K conversion output units, and the K first capacitors are connected in series. The K first capacitors connected in series are then connected in parallel to the main DC bus. The first capacitors can serve as filters and energy storage.

[0121] For example, such as Figure 21 As shown, the power conversion module 1 includes three second AC / DC converters, and the power supply module 2 includes one second power supply unit 202. A first capacitor C1 is connected in parallel to the output terminals of the second AC / DC converters 103-1, 103-2, and 103-3. The three first capacitors C1 are connected in series. After being connected in series, the three first capacitors C1 are connected in parallel to the main DC buses 3-1 and 3-2. The second AC / DC converters 103-1, 103-2, and 103-3 are connected in series and then connected to the second power supply unit 202 via the main DC buses 3-1 and 3-2.

[0122] For example, such as Figure 22As shown, the power conversion module 1 includes a first AC / DC converter 101 and three first DC / DC converters, and the power supply module 2 includes three first power supply units. First DC / DC converters 102-1, 102-2, and 102-3 are connected in parallel to the output of the first AC / DC converter 101. First power supply units 201-1, 201-2, and 201-3 are connected in series. First DC / DC converter 102-1 is connected to first power supply unit 201-1 via a main DC bus 3-1 and a common connection line 4-1. First DC / DC converter 102-2 is connected to first power supply unit 201-2 via common connection lines 4-1 and 4-2. First DC / DC converter 102-3 is connected to first power supply unit 201-3 via common connection line 4-2 and main DC bus 3-2. The output terminals of the first DC / DC converters 102-1, 102-2, and 102-3 are each connected in parallel with a first capacitor C1, and the three first capacitors C1 are connected in series. The three first capacitors C1 connected in series are then connected in parallel with the main DC bus 3. One end of the common connection line 4-1 is connected to the connection line between two of the first capacitors C1, and the other end of the common connection line 4-1 is connected to the connection line between the first power supply unit 201-1 and the first power supply unit 201-2. One end of the common connection line 4-2 is connected to the connection line between two of the first capacitors C1, and the other end of the common connection line 4-2 is connected to the connection line between the first power supply unit 201-2 and the first power supply unit 201-3.

[0123] Based on the above embodiments, the DC power supply device provided in this utility model embodiment further includes an energy storage module, which is connected in parallel to the main DC bus.

[0124] For example, such as Figure 23 As shown, the power conversion module 1 includes one first AC / DC converter 101 and two first DC / DC converters: first DC / DC converter 102-1 and first DC / DC converter 102-2; the power supply module 2 includes a first power supply unit 201-1 and a first power supply unit 201-2. The energy storage module 5-1 is connected to the first DC / DC converter 102-1 via the main DC bus 3-1 and the common connection line 4. The energy storage module 5-2 is connected to the first DC / DC converter 102-2 via the common connection line 4 and the main DC bus 3-2. The energy storage module 5-1 is connected to the first power supply unit 201-1 via the main DC bus 3-1 and the common connection line 4; the energy storage module 5-2 is connected to the first power supply unit 201-2 via the common connection line 4 and the main DC bus 3-2.

[0125] Figure 24 This is a schematic diagram of the DC power supply device provided in the twenty-third embodiment of this utility model, as shown below. Figure 24 As shown, the DC power supply device provided in this embodiment of the present invention also includes an energy storage module 5, which is connected to the power conversion module 1.

[0126] Specifically, addressing the issue of reduced lifespan resulting from directly connecting energy storage batteries in parallel to the main DC bus in existing technologies, the energy storage module 5 is no longer connected in parallel to the output side of the power conversion module 1. Instead, the input of the energy storage module 5 is connected to the rectifier power supply stage of the power conversion module 1. When the power conversion module 1 supplies power to the power supply module 2, it can simultaneously charge the energy storage module 5. When the power conversion module 1 is disconnected or loses power, the energy storage module 5 can supply power to the power supply module 2, ensuring uninterrupted power supply to the power supply module 2. The energy storage module 5 can be a battery or a battery pack, selected according to actual needs; this embodiment of the invention does not impose any limitations.

[0127] Since energy storage module 5 is not connected in parallel to the output side of power conversion module 1, but rather its input is connected to the rectifier power supply stage of power conversion module 1, the output voltage of the DC power supply system is independent of the voltage of energy storage module 5. Therefore, the output voltage of power conversion module 1 can be set to a fixed value. Because energy storage module 5 is connected to power conversion module 1 but not directly connected to the load, its charging and discharging are independent of the load. This allows for precise control of the charging and discharging current of energy storage module 5, effectively controlling its operation so that it only discharges when power conversion module 1 is disconnected, reducing the number of charging and discharging cycles and extending its lifespan.

[0128] The output voltage of the DC power supply system is independent of the voltage of the energy storage module 5. Its output voltage range can be very small, and a higher voltage can be selected. For example, for a 336V DC power supply system, a higher voltage range of 380-402Vdc can be chosen. For the same system power, increasing the output voltage reduces the current, resulting in a smaller switching capacity and thinner cables. This means that the cost and losses of the downstream DC power distribution system will be lower.

[0129] In addition, when a short circuit fault occurs in the power supply module 2, the energy storage module 5 can provide sufficient short circuit current through redundancy technology, so that the faulty power supply module 2 can be disconnected more reliably.

[0130] Figure 25 This is a schematic diagram of the DC power supply device provided in the twenty-fourth embodiment of this utility model, as shown below. Figure 25 As shown, based on the above embodiments, the power conversion module 1 further includes K second DC / DC converters 104;

[0131] K second DC / DC converters 104 are connected in series;

[0132] The first terminals of the K second DC / DC converters 104 are connected to the energy storage module. The K second DC / DC converters 104 are connected one-to-one with the K conversion output units 102. The output terminals of the second DC / DC converters 104 and the corresponding conversion output units 102 are connected in parallel.

[0133] The second DC / DC converter 104 is used to charge the energy storage module 5 with the first DC power or to output the electrical energy of the energy storage module 5 to the power supply module 2 through the main DC bus 3. The second DC / DC converter 104 may include multiple second DC / DC sub-converters connected in parallel.

[0134] For example, such as Figure 25 As shown, the power conversion module 1 includes two conversion output units 102 and two second DC / DC converters 104. The two conversion output units 102 are connected in series, and the two second DC / DC converters 104 are connected in series. The output terminal of each conversion output unit 102 is connected to one second DC / DC converter 104, and the energy storage module 5 is connected to each of the two second DC / DC converters 104. When external AC power is connected, the AC power is converted into first DC power through the conversion output units 102. The first DC power is output to the main DC bus 3 to supply power to the power supply module 2, and can also be output to the second DC / DC converters 104. The second DC / DC converters 104 charge the energy storage module 5 through the first DC power. The two second DC / DC converters 104 are connected to the power supply module 2 through the main DC bus 3. When the power conversion module 1 is disconnected or loses power, the energy storage module 5 can output the first DC power through the second DC / DC converters 104 to supply power to the power supply module 2. The conversion output unit 102 can be a first DC / DC converter or a second AC / DC converter.

[0135] For example, such as Figure 26As shown, the power conversion module 1 includes two conversion output units 102 and two second DC / DC converters 104. The two conversion output units 102 are connected in series, and the two second DC / DC converters 104 are connected in series. The output terminal of each conversion output unit 102 is connected to one second DC / DC converter 104, and the energy storage module 5 is connected to each of the two second DC / DC converters 104. The power conversion module 1 includes a second power supply unit 202. When external AC power is connected, the AC power is converted into first DC power through the conversion output units 102. The first DC power is output to the main DC bus 3 to the second power supply unit 202, and can also be output to the second DC / DC converters 104. The second DC / DC converters 104 charge the energy storage module 5 using the first DC power. Two second DC / DC converters 104 are connected to the second power supply unit 202 via the main DC bus 3. When the power conversion module 1 is disconnected or loses power, the energy storage module 5 can output first DC power through the second DC / DC converters 104 to power the second power supply unit 202. The conversion output unit 102 can be either the first DC / DC converter or the second AC / DC converter.

[0136] For example, such as Figure 27 As shown, the power conversion module 1 includes two conversion output units 102 and two second DC / DC converters 104. The two conversion output units 102 are connected in series, and the two second DC / DC converters 104 are connected in series. The output terminal of each conversion output unit 102 is connected to one second DC / DC converter 104, and the energy storage module 5 is connected to each of the two second DC / DC converters 104. The power supply module 2 includes two first power supply units 201. Each conversion output unit 102 is connected to one first power supply unit 201 through a main DC bus 3 and a common connection line 4, and each second DC / DC converter 104 is connected to one first power supply unit 201 through a main DC bus 3 and a common connection line 4. The conversion output unit 102 can be either a first DC / DC converter or a second AC / DC converter.

[0137] When external AC power is connected, the AC power is converted into first DC power by the conversion output unit 102. This first DC power is output to the main DC bus 3 and common connection line 4 to supply power to the first power supply unit 201, and simultaneously output to the second DC / DC converter 104. The second DC / DC converter 104 charges the energy storage module 5 using the first DC power. When the power conversion module 1 is disconnected or loses power, the energy storage module 5 can output the first DC power through the second DC / DC converter 104. This first DC power supplies power to the first power supply unit 201 through the main DC bus 3 and common connection line 4.

[0138] For example, such as Figure 28As shown, the power conversion module 1 includes one first AC / DC converter 101, two first DC / DC converters 102, and two second DC / DC converters 104. The output of each first DC / DC converter 102 is connected to one second DC / DC converter 104, and the energy storage module 5 is connected to each of the two second DC / DC converters 104. The power supply module 2 includes two first power supply units 201. One conversion output unit 102 is connected to one first power supply unit 201 via a main DC bus 3-1 and a common connection line 4, and another first DC / DC converter 102 is connected to another first power supply unit 201 via a common connection line 4 and a main DC bus 3-2. One second DC / DC converter 104 is connected to one first power supply unit 201 via a main DC bus 3-1 and a common connection line 4, and another second DC / DC converter 104 is connected to another first power supply unit 201 via a common connection line 4 and a main DC bus 3-2.

[0139] When an external AC power source is connected, the AC power is converted into a first DC power source through the first AC / DC converter 101 and two first DC / DC converters 102. The first DC power source supplies power to the first power supply unit 201 by outputting to the main DC bus 3-1 and 3-2 and the common connection line 4. At the same time, it can also be output to the second DC / DC converter 104. The second DC / DC converter 104 charges the energy storage module 5 through the first DC power source. When the power conversion module 1 is disconnected or loses power, the energy storage module 5 can output the first DC power source through the second DC / DC converter 104. The first DC power source supplies power to the first power supply unit 201 through the main DC bus 33-1 and 3-2 and the common connection line 4.

[0140] Figure 29 This is a schematic diagram of the DC power supply device provided in the twenty-eighth embodiment of this utility model, as shown below. Figure 29 As shown, based on the above embodiments, the power conversion module 1 further includes K second capacitors C2;

[0141] K second capacitors C2 are connected one-to-one with K second DC / DC converters 104, and the second capacitors C2 are connected in parallel to the second terminal of the second DC / DC converter 104. The K second capacitors C2 are also connected in series. The series-connected K second capacitors C2 are then connected in parallel to the main DC bus 3. The second capacitors function as filters and energy storage devices.

[0142] For example, such as Figure 30As shown, the power conversion module 1 includes a first AC / DC converter 101 and three first DC / DC converters. The input terminal of the first DC / DC converter 102-1 is connected to the output terminal of the first AC / DC converter 101, the input terminal of the first DC / DC converter 102-2 is connected to the output terminal of the first AC / DC converter 101, and the input terminal of the first DC / DC converter 102-3 is connected to the output terminal of the first AC / DC converter 101. A first capacitor C1 is connected in parallel to the output terminal of each first DC / DC converter 102, and the three first capacitors C1 are connected in series. The three first capacitors C1 connected in series are then connected in parallel with the main DC bus 3-1 and 3-2.

[0143] Power supply module 2 includes three first power supply units: a first DC / DC converter 102-1, a first DC / DC converter 102-2, and a first DC / DC converter 102-3 connected in series. The first DC / DC converter 102-1 is connected to the first power supply unit 201-1 via a main DC bus 3-1 and a common connection line 4-1. The first output terminal of the first DC / DC converter 102-1 is connected to the first input terminal of the first power supply unit 201-1 via the main DC bus 3-1, and the second output terminal of the first DC / DC converter 102-1 is connected to the second input terminal of the first power supply unit 201-1 via the common connection line 4-1. The first DC / DC converter 102-2 is connected to the first power supply unit 201-1 via common connection lines 4-1 and 4-2. The first output terminal of the first DC / DC converter 102-2 is connected to the first input terminal of the first power supply unit 201-2 via common connection line 4-1, and the second output terminal of the first DC / DC converter 102-2 is connected to the second input terminal of the first power supply unit 201-2 via common connection line 4-2; the first DC / DC converter 102-3 is connected to the first power supply unit 201-3 via common connection line 4-2 and the main DC bus 3-2, the first output terminal of the first DC / DC converter 102-3 is connected to the first input terminal of the first power supply unit 201-3 via common connection line 4-2, and the second output terminal of the first DC / DC converter 102-3 is connected to the second input terminal of the first power supply unit 201-3 via common connection line 4-3.

[0144] The standard output voltage of power conversion module 1 is three times the nominal voltage, and the voltages of the total DC buses 3-1 and 3-2 are equal to the output voltage of power conversion module 1. The output voltages of the first DC / DC converters 102-1, 102-2, and 102-3 are equal to the nominal voltages. The input voltages of the first power supply units 201-1, 201-2, and 201-3 are equal to the nominal voltages.

[0145] A second capacitor C2 is connected in parallel to the second terminal of each second DC / DC converter. The first terminals of the second DC / DC converters 104-1, 104-2, and 104-3 are respectively connected to the energy storage module 5. The second terminal of the second DC / DC converter 104-1 is connected to the output terminal of the first DC / DC converter 102-1, the second terminal of the second DC / DC converter 104-2 is connected to the output terminal of the first DC / DC converter 102-2, and the second terminal of the second DC / DC converter 104-3 is connected to the output terminal of the first DC / DC converter 102-3.

[0146] The second terminal of the second DC / DC converter 104-1 is connected to the input terminal of the first power supply unit 201-1 via the main DC bus 3-1 and the common connection line 4-1; the second terminal of the second DC / DC converter 104-2 is connected to the input terminal of the first power supply unit 201-2 via the common connection line 4-1 and the common connection line 4-2; the second terminal of the second DC / DC converter 104-3 is connected to the input terminal of the first power supply unit 201-3 via the common connection line 4-2 and the main DC bus 3-2.

[0147] For example, such as Figure 31 As shown, the power conversion module 1 includes a first AC / DC converter 101 and three first DC / DC converters. The input terminal of the first DC / DC converter 102-1 is connected to the output terminal of the first AC / DC converter 101, the input terminal of the first DC / DC converter 102-2 is connected to the output terminal of the first AC / DC converter 101, and the input terminal of the first DC / DC converter 102-3 is connected to the output terminal of the first AC / DC converter 101. A first capacitor C1 is connected in parallel to the output terminal of each first DC / DC converter 102, and the three first capacitors C1 are connected in series. The three first capacitors C1 connected in series are then connected in parallel with the main DC bus 3-1 and 3-2.

[0148] The power supply module 2 includes a second power supply unit 202; the first DC / DC converter 102-1, the first DC / DC converter 102-2 and the first DC / DC converter 102-3 are connected in series and then connected to the second power supply unit 202 through the main DC bus 3-1 and 3-2.

[0149] The standard output voltage of power conversion module 1 is three times the nominal voltage, and the voltages of the main DC buses 3-1 and 3-2 are equal to the output voltage of power conversion module 1. The output voltages of the first DC / DC converters 102-1, 102-2, and 102-3 are equal to the nominal voltages. The input voltages of the second power supply unit 202 are all equal to the nominal voltages.

[0150] A second capacitor C2 is connected in parallel to the second terminal of each second DC / DC converter. The first terminals of the second DC / DC converters 104-1, 104-2, and 104-3 are respectively connected to the energy storage module 5. The second terminal of the second DC / DC converter 104-1 is connected to the output terminal of the first DC / DC converter 102-1, the second terminal of the second DC / DC converter 104-2 is connected to the output terminal of the first DC / DC converter 102-2, and the second terminal of the second DC / DC converter 104-3 is connected to the output terminal of the first DC / DC converter 102-3. The second DC / DC converters 104-1, 104-2, and 104-3 are connected in series and then connected to the second power supply unit 202 through the main DC buses 3-1 and 3-2.

[0151] Figure 32 This is a schematic diagram of the DC power supply device provided in the thirty-first embodiment of this utility model, as shown below. Figure 32 As shown, based on the above embodiments, the number of power conversion modules 1 is further N, where N is an integer greater than or equal to 1;

[0152] When N is greater than 1, the input terminals of multiple power conversion modules 1 are connected to an external AC power supply, and the output terminals of multiple power conversion modules 1 are connected to the main DC bus 3. The multiple power conversion modules 1 are connected in parallel. The input terminal of the power supply module 2 is connected to the main DC bus 3. When multiple power conversion modules 1 are connected in parallel, a greater power output can be provided. The number of power conversion modules 1 is set according to actual needs, and this embodiment of the invention does not limit this.

[0153] For example, such as Figure 32 As shown, the input terminal of each power conversion module 1 is connected to the mains power, and the output terminal of each power conversion module 1 is connected to the mains DC bus 3. Parallel connection of the power conversion modules 1 can provide greater power output to meet the needs of practical application scenarios.

[0154] Figure 33 This is a schematic diagram of the DC power supply device provided in the thirty-second embodiment of this utility model, as shown below. Figure 33As shown, based on the above embodiments, the number of power supply modules 2 is further M, where M is a positive integer greater than or equal to 1;

[0155] When M is greater than 1, the input terminals of multiple power supply modules 2 are connected to the main DC bus 3, and the multiple power supply modules 2 are connected in parallel.

[0156] For example, such as Figure 33 As shown, the output terminal of each power conversion module 1 is connected in parallel to the total DC bus 3, and the input terminal of each power supply module 2 is connected in parallel to the total DC bus 3.

[0157] Figure 34 This is a schematic diagram of the DC power supply system provided in the thirty-third embodiment of this utility model, as shown below. Figure 34 As shown, the DC power supply system provided in this embodiment of the present invention includes multiple DC power supply devices 100 of any of the above embodiments connected in parallel.

[0158] Specifically, each DC power supply device 100 is connected to an external AC power source at its input terminal. The DC power supply device 100 can be any of the DC power supply devices described in the above embodiments, selected according to actual needs. This embodiment of the present invention does not impose any limitation on the number of DC power supply devices 100. The number of DC power supply devices 100 can be 2, 3, 4, 5, 6, etc., set according to actual needs. This embodiment of the present invention does not impose any limitation on the number of DC power supply devices 100.

[0159] In the description of this specification, the references to terms such as "an embodiment," "a specific embodiment," "some embodiments," "for example," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0160] The above specific embodiments further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above are only specific embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A DC power supply device, characterized in that, It includes a power conversion module and a power supply module, wherein: The power conversion module and the power supply module are connected via a main DC bus; The power conversion module is used to convert external AC power into a first DC power output; the power supply module is used to receive the first DC power and supply power to the load. The power conversion module includes K conversion output units, which are connected in series and then connected to the power supply module through the main DC bus. The output voltage of a single conversion output unit is the nominal voltage. The voltage of the total DC bus is equal to the output voltage of the power conversion module; wherein, the standard output voltage of the power conversion module is K times the nominal voltage, and K is a positive integer greater than or equal to 2.

2. The DC power supply device according to claim 1, characterized in that, The power supply module includes K first power supply units; K first power supply units are connected in series, and two adjacent first power supply units share a common connection line. One end of the common connection line is connected to the connection midpoint of two adjacent first power supply units, and the other end of the common connection line is connected to the connection midpoint of two adjacent conversion output units. There are K-1 common connection lines; The input voltage of each of the first power supply units is the nominal voltage.

3. The DC power supply device according to claim 1, characterized in that, The power supply module includes one second power supply unit; The K conversion output units are connected in series and then connected to the second power supply unit via the main DC bus. The input voltage of the second power supply unit is k times the nominal voltage.

4. The DC power supply device according to claim 1, characterized in that, The power conversion module includes at least one first AC / DC converter, and the conversion output unit is a first DC / DC converter, wherein: Each of the first AC / DC converters corresponds to at least one first DC / DC converter, and each first DC / DC converter is connected in parallel with the output of the corresponding first AC / DC converter. The first AC / DC converter is used to convert external AC power into a second DC power, and the first DC / DC converter is used to convert the second DC power into a first DC power output.

5. The DC power supply device according to claim 1, characterized in that, The conversion output unit is a second AC / DC converter, which is used to convert external AC power into a first DC power output.

6. The DC power supply device according to claim 1, characterized in that, The power conversion module also includes K first capacitors; The K first capacitors are connected one-to-one with the K conversion output units, and the K first capacitors are connected in series.

7. The DC power supply device according to claim 1, characterized in that, It also includes an energy storage module, which is connected to the power conversion module.

8. The DC power supply device according to claim 7, characterized in that, The power conversion module also includes K second DC / DC converters; K second DC / DC converters connected in series; The first terminals of the K second DC / DC converters are connected to the energy storage module, and the K second DC / DC converters are connected one-to-one with the K conversion output units. The output terminals of the second DC / DC converters and the conversion output units are connected in parallel.

9. The DC power supply device according to claim 8, characterized in that, The power conversion module also includes K second capacitors; K second capacitors are connected one-to-one with K second DC / DC converters, and the second capacitors are connected in parallel on the second terminal of the second DC / DC converter, and the K second capacitors are connected in series.

10. The DC power supply device according to claim 1, characterized in that, The number of power conversion modules is N, where N is an integer greater than or equal to 1; When N is greater than 1, the input terminals of the multiple power conversion modules are connected to an external AC power supply, the output terminals of the multiple power conversion modules are connected to the main DC bus, and the multiple power conversion modules are connected in parallel.

11. The DC power supply device according to claim 10, characterized in that, The number of power supply modules is M, where M is a positive integer greater than or equal to 1; When M is greater than 1, the input terminals of the multiple power supply modules are connected to the main DC bus, and the multiple power supply modules are connected in parallel.

12. A DC power supply system, characterized in that, It includes multiple DC power supply devices as described in any one of claims 1 to 11 connected in parallel.

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