Direct current charging power cabinet and internal power supply system thereof

Abstract

The utility model provides a DC charging power cabinet and an internal power supply system thereof, and the power supply system comprises an EMI module, one end of which is connected with an AC input end; an AC / DC conversion module; and the direct current power supply busbar is connected with the direct current end of the AC / DC conversion module and is used for providing direct current for electric equipment. All AC-DC modules of an internal power supply system of the DC charging power cabinet are integrated at the input end, a DC power supply busbar is provided, DC is provided for each functional module for use through the DC power supply busbar, and overall EMI filtering is performed before AC-DC conversion, so that the number of parts of the DC charging power cabinet can be reduced, and the cost is reduced. The overall efficiency is improved, the space is reduced, the cost is reduced, and the direct current power supply busbar can be conveniently provided with a bidirectional direct current electric energy converter so as to be used by an energy storage module, and can also be externally connected with a photovoltaic power generation system or a direct current power supply system to directly connect and charge the direct current busbar for bidirectional charging and discharging.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy, and in particular to an internal power supply system of a direct current charging power cabinet. Background Art

[0002] A large DC power cabinet may contain multiple functional modules, such as power modules, auxiliary power supplies, fans, cooling systems, energy storage modules, etc. For each functional module, the architecture of its internal power supply system requires two-stage conversion, that is, before each functional module, a first-level AC / DC conversion module (AC / DC) is first set, and then a first-level DC / DC conversion module (DC, DC) or DC / AC conversion module is set according to actual needs.

[0003] The above architecture has low conversion efficiency. For each functional module, a separate DC / DC conversion module or DC / AC conversion module needs to be set up, which is large in size and takes up space. In addition, the EMI (Electromagnetic Interference) of each DC / AC conversion module in this design needs to be independently certified. There is EMI interference between each other. Not only does it require overall EMI filtering before AC / DC conversion, but EMI filtering is also required before each DC / DC or DC / AC conversion module. The EMI filtering design is complicated. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides an internal power supply system of a DC charging power cabinet.

[0005] The utility model also provides a DC charging power cabinet.

[0006] The technical solution adopted by the utility model is as follows:

[0007] The utility model proposes an internal power supply system of a DC charging power cabinet, comprising: an EMI module, one end of the EMI module is connected to an AC input end; an AC / DC conversion module, the AC end of the AC / DC conversion module is connected to the other end of the EMI module; a DC power supply busbar, the DC power supply busbar is connected to the DC end of the AC / DC conversion module, the DC power supply busbar is also connected to an electrical device, and the DC power supply busbar is used to provide DC power to the electrical device.

[0008] The internal power supply system of the DC charging power cabinet of the utility model also has the following additional technical features:

[0009] Specifically, the electrical equipment includes: a power module, one end of the power module is connected to the DC power supply busbar, and the other end of the power module serves as a DC output end of the DC charging power cabinet.

[0010] Furthermore, the electrical equipment also includes: a first DC / AC module and a water pump, the first DC / AC module and the water pump are connected in series and then connected to the DC power supply bus; a second DC / AC module and a compressor, the second DC / AC module and the compressor are connected in series and then connected to the DC power supply bus; a third DC / AC module and a fan, the third DC / AC module and the fan are connected in series and then connected to the DC power supply bus.

[0011] Furthermore, the electrical equipment also includes: an auxiliary power supply, which is connected to the DC power supply busbar through a DC / DC module, and is used to provide auxiliary DC power; a bidirectional energy storage module, which is connected to the DC power supply busbar, and is used to obtain and store DC power from the DC power supply busbar, and to provide DC power.

[0012] Specifically, the internal power supply system of the above-mentioned DC charging power cabinet also includes: an air switch, one end of the air switch is connected to the AC input end, and the other end of the air switch is connected to one end of the EMI module.

[0013] Specifically, the DC power supply busbar is also connected to an external photovoltaic power generation system or an external DC power supply system.

[0014] The utility model also provides a DC charging power cabinet, comprising the internal power supply system of the DC charging power cabinet mentioned above.

[0015] Beneficial effects of the utility model:

[0016] The utility model concentrates all AC-to-DC modules of the power supply system inside the DC charging power cabinet at the input end, provides a DC power supply busbar, and then provides DC power to each functional module via the DC power supply busbar, and performs overall EMI filtering before AC-to-DC conversion, thereby saving the number of parts of the DC charging power cabinet, improving overall efficiency, reducing space, and reducing costs. In addition, the DC power supply busbar can be easily installed with a bidirectional DC power converter to provide energy storage modules, and can also be externally connected to a photovoltaic power generation system or a DC power supply system to directly connect the DC busbar for charging, and perform bidirectional charging and discharging, with many application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the internal power supply system of a DC charging power cabinet according to an embodiment of the utility model;

[0018] Figure 2 It is an embodiment according to the utility model. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] Figure 1 : is a schematic diagram of the structure of the internal power supply system of the DC charging power cabinet according to an embodiment of the utility model, such as Figure 1 As shown, the power supply system includes: an EMI module 1, an AC / DC conversion module 2, and a DC power supply busbar DC bus.

[0021] Among them, one end of the EMI module 1 is connected to the AC input end AC; the AC end of the AC / DC conversion module 2 is connected to the other end of the EMI module 1; the DC power supply bus DC bus is connected to the DC end of the AC / DC conversion module 2, and the DC power supply bus DCbus is also connected to the electrical equipment 3, and the DC power supply bus DC bus is used to provide DC power to the electrical equipment 3.

[0022] Specifically, Figure 1 As shown, the entire power supply system concentrates all internal AC to DC power supplies (AC / DC conversion module 2) at the input end, first integrates AC to DC, provides DC power supply busbar DC bus, and then provides DC power to each power-consuming device 3 via the DC power supply busbar DCbus. Due to the integration of AC / DC conversion module 2, only one EMI module is required at the front end of AC / DC conversion module 2 to meet the electromagnetic interference requirements. As a result, the number of parts of the DC charging power cabinet can be saved, the overall efficiency can be improved, the space can be reduced, the cost can be reduced, and the DC power supply busbar can be easily installed with a bidirectional DC power converter to provide energy storage modules.

[0023] In an embodiment of the utility model, the DC power supply busbar can also be connected to an external photovoltaic power generation system or an external DC power supply system, and the external photovoltaic power generation system or the external DC power supply system can directly charge the DC busbar for bidirectional charging and discharging.

[0024] In one embodiment of the present invention, Figure 2 As shown, the internal power supply system of the above-mentioned DC charging power cabinet may also include: an air switch 4, one end of the air switch 4 is connected to the AC input end AC, and the other end of the air switch 4 is connected to one end of the EMI module 1.

[0025] Specifically, the air switch 4 can control the on and off of the entire power supply system, and can also provide protection against short circuits, severe overloads, undervoltages, etc. in the DC charging power cabinet.

[0026] According to one embodiment of the utility model, Figure 2 As shown, the electrical equipment 3 may include: a power module 31, one end of the power module 31 is connected to the DC power supply bus DC bus, and the other end of the power module 31 serves as a DC output terminal DC of the DC charging power cabinet, and the DC output terminal DC can provide DC power to the outside.

[0027] According to one embodiment of the utility model, Figure 2 As shown, the electric device 3 may further include: a first DC / AC module and a water pump 32, a second DC / AC module and a compressor 33, and a fan 34. The first DC / AC module and the water pump 32 are connected in series and then connected to the DC power supply bus DC bus; the second DC / AC module and the compressor 33 are connected in series and then connected to the DC power supply bus DC bus; the third DC / AC module and the fan 34 are connected in series and then connected to the DC power supply bus DC bus.

[0028] According to one embodiment of the utility model, Figure 2 As shown, the power-consuming device 3 may further include: an auxiliary power supply 35 and a bidirectional energy storage module 36. The auxiliary power supply 35 is connected to the DC power supply busbar DC bus through a DC / DC module, and the auxiliary power supply 35 is used to provide auxiliary DC power; the bidirectional energy storage module 36 is connected to the DC power supply busbar DC bus, and the bidirectional energy storage module 36 is used to obtain and store DC power from the DC power supply busbar DC bus, and to provide DC power.

[0029] Specifically, the auxiliary power supply 35 is a DC / DC module, which can provide auxiliary power supply when necessary. The bidirectional energy storage module 36 can work in both directions, that is, it can store DC power and release DC power, directly connect to the DC bus for charging, and perform bidirectional charging and discharging.

[0030] It can be understood that the above-mentioned and Figure 2 The specific form of the electrical equipment 3 shown is only an example, and all functional modules inside the DC charging power cabinet that need to be powered are within the scope of the electrical equipment 3 described in the present utility model.

[0031] To summarize, according to the internal power supply system of the DC charging power cabinet of the utility model, all AC-to-DC modules of the internal power supply system of the DC charging power cabinet are concentrated at the input end to provide a DC power supply busbar, and then DC power is provided to each functional module via the DC power supply busbar, and overall EMI filtering is performed before AC-to-DC conversion, thereby saving the number of parts of the DC charging power cabinet, improving overall efficiency, reducing space, and reducing costs. In addition, the DC power supply busbar can be easily installed with a bidirectional DC power converter to provide energy storage modules for use, and can also be externally connected to a photovoltaic power generation system or a DC power supply system to directly connect the DC busbar for charging, and perform bidirectional charging and discharging.

[0032] In addition, the utility model also proposes a DC charging power cabinet, including the internal power supply system of the DC charging power cabinet mentioned above.

[0033] According to the DC charging power cabinet of the utility model, through the internal power supply system of the DC charging power cabinet, all AC-to-DC modules of the internal power supply system of the DC charging power cabinet are concentrated at the input end to provide a DC power supply busbar, and then DC power is provided to each functional module through the DC power supply busbar, and overall EMI filtering is performed before AC-to-DC conversion, thereby saving the number of parts of the DC charging power cabinet, improving overall efficiency, reducing space, and reducing costs. In addition, the DC power supply busbar can be easily installed with a bidirectional DC power converter to provide energy storage modules for use, and can also be externally connected to a photovoltaic power generation system or a DC power supply system to directly connect the DC busbar for charging, and perform bidirectional charging and discharging.

[0034] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0035] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0037] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. An internal power supply system of a DC charging power cabinet, characterized in that: include: An EMI module, one end of which is connected to the AC input end; An AC / DC conversion module, wherein an AC end of the AC / DC conversion module is connected to the other end of the EMI module; A DC power supply busbar, wherein the DC power supply busbar is connected to the DC end of the AC / DC conversion module, and the DC power supply busbar is also connected to an electrical device, and the DC power supply busbar is used to provide DC power to the electrical device.

2. The internal power supply system of the DC charging power cabinet according to claim 1 is characterized in that: The electrical equipment includes: a power module, one end of the power module is connected to the DC power supply busbar, and the other end of the power module serves as a DC output end of the DC charging power cabinet.

3. The internal power supply system of the DC charging power cabinet according to claim 2 is characterized in that: The electrical equipment also includes: A first DC / AC module and a water pump, wherein the first DC / AC module and the water pump are connected in series and then connected to the DC power supply busbar; A second DC / AC module and a compressor, wherein the second DC / AC module is connected in series with the compressor and then connected to the DC power supply busbar; A third DC / AC module and a fan are provided, wherein the third DC / AC module is connected in series with the fan and then connected to the DC power supply busbar.

4. The internal power supply system of the DC charging power cabinet according to claim 2, characterized in that: The electrical equipment also includes: An auxiliary power supply, the auxiliary power supply is connected to the DC power supply busbar through a DC / DC module, and the auxiliary power supply is used to provide auxiliary DC power; A bidirectional energy storage module, wherein the bidirectional energy storage module is connected to the DC power supply busbar, and the bidirectional energy storage module is used to obtain and store DC power from the DC power supply busbar, and to provide DC power.

5. The internal power supply system of the DC charging power cabinet according to claim 1, characterized in that: Also includes: An air switch, one end of which is connected to the AC input end, and the other end of which is connected to one end of the EMI module.

6. The internal power supply system of the DC charging power cabinet according to claim 1, characterized in that: The DC power supply busbar is also connected to an external photovoltaic power generation system or an external DC power supply system.

7. A DC charging power cabinet, characterized in that: An internal power supply system comprising a DC charging power cabinet according to any one of claims 1-6.

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