A bidirectional high voltage direct current source

Abstract

The utility model discloses a kind of bidirectional high-voltage direct current sources, belong to the technical field of charge-discharge equipment.The bidirectional high-voltage direct current source includes box, resonance circuit component and step-down circuit component;Resonance circuit component and step-down circuit component are located in box;Resonance circuit component includes at least two resonant circuits, each resonant circuit includes resonance power board and resonance control board, step-down circuit component includes step-down power board and step-down control board, two resonance power boards and step-down power board are parallelly installed in the bottom of box, each resonance control board and corresponding resonance power board, step-down power board and step-down control board are vertically inserted, each resonance power board is electrically connected with step-down power board, each resonance power board is used to receive high-voltage direct current source, two resonance control boards and step-down control board are arranged in parallel with interval.The utility model embodiment provides a kind of bidirectional high-voltage direct current source, not only simple structure, compact, overall volume is small, but also can improve heat dissipation efficiency.

Description

Technical Field

[0001] This utility model belongs to the technical field of charging and discharging equipment, specifically relating to a bidirectional high-voltage DC source. Background Technology

[0002] A bidirectional high-voltage DC power supply integrates the functions of a high-voltage DC power supply and a regenerative electronic load. It is an indispensable testing device for power supply laboratories and research institutions, especially in the new energy industry. It is particularly suitable for aging tests of products such as photovoltaic inverters, photovoltaic-storage converters, charging piles, and lithium battery packs.

[0003] However, the existing bidirectional high voltage DC power sources have large circuit board layouts (mainly flat) and multiple separate housings forming air duct structures, resulting in a large overall size and complex structure. Utility Model Content

[0004] In view of the above-mentioned defects or improvement needs of the existing technology, this utility model provides a bidirectional high voltage DC source, the purpose of which is not only to have a simple and compact structure and small overall size, but also to improve heat dissipation efficiency.

[0005] To achieve the above objectives, this utility model provides a bidirectional high voltage DC power source, which includes a housing, a resonant circuit assembly, and a step-down circuit assembly.

[0006] Both the resonant circuit assembly and the buck circuit assembly are located inside the housing.

[0007] The resonant circuit assembly includes at least two resonant circuits, each of which includes a resonant power board and a resonant control board. The step-down circuit assembly includes a step-down power board and a step-down control board. The two resonant power boards and the step-down power board are mounted parallel to each other at the bottom of the housing. Each resonant control board is perpendicularly inserted into the corresponding resonant power board, step-down power board, and step-down control board. Each resonant power board is electrically connected to the step-down power board. Each resonant power board receives a high-voltage DC source. The resonant control board converts the high-voltage DC source received by the resonant power board into a low-voltage DC source. The step-down control board converts the two low-voltage DC sources received by the step-down power board into a single voltage. The two resonant control boards and the step-down control board are arranged in parallel intervals to form corresponding air ducts.

[0008] Optionally, the bidirectional high-voltage DC source further includes a power supply board located inside the housing, which is used to supply power to the resonant circuit assembly and the buck circuit assembly.

[0009] Optionally, ventilation holes are provided on two opposite side panels of the box body, each ventilation hole facing the air duct, and the inner wall of the box body has multiple spaced fans, each fan facing the corresponding ventilation hole.

[0010] Optionally, the resonant circuit assembly is located on one side of the inner cavity of the housing, and the step-down circuit assembly is located on the other side of the inner cavity of the housing.

[0011] Optionally, one side panel of the housing is provided with a terminal block opening, a positive output terminal opening, and a negative output terminal opening. The terminal block opening, the positive output terminal opening, and the negative output terminal opening are arranged at intervals. A terminal block is inserted into the terminal block opening, and the two terminals of the terminal block are electrically connected to the positive and negative terminals of the two resonant power boards, respectively. A positive output terminal electrically connected to the positive terminal of the step-down power board is inserted into the positive output terminal opening, and a negative output terminal electrically connected to the negative terminal of the step-down power board is inserted into the negative output terminal opening.

[0012] Optionally, an LED light is provided on the step-down power board, and a light guide column is inserted into the housing. One end of the light guide column extends out of the housing, and the other end extends into the housing and is arranged opposite to the LED light.

[0013] Optionally, a wire clamp is provided at the other end of the light guide post, and the bottom of the wire clamp is installed at the bottom of the box body.

[0014] Optionally, each of the resonant power boards and the buck power boards is provided with a heat sink.

[0015] Optionally, the housing includes a front panel, a rear panel, a cover plate, and a U-shaped shell, and the front panel, the rear panel, the cover plate, and the U-shaped shell form a space for accommodating the resonant circuit assembly and the buck circuit assembly.

[0016] Optionally, two parallel, spaced handles are provided on both sides of the U-shaped housing.

[0017] The aforementioned improved technical features can be combined with each other as long as they do not conflict with each other.

[0018] In summary, the beneficial effects of the above-described technical solutions conceived by this utility model compared with the prior art include:

[0019] (1) The bidirectional high voltage DC power source provided in this embodiment of the present invention is characterized by the vertical insertion of each resonant control board with the corresponding resonant power board, step-down power board and step-down control board, and the electrical connection of each resonant power board with the step-down power board. This results in a simple layout of multiple circuit boards, a small volume of the structure formed by the multiple circuit boards, a more compact structure, and a high power density. In addition, the two resonant control boards and the step-down control board are arranged in parallel intervals, thereby forming multiple air ducts. While performing voltage conversion and processing, the smooth flow of internal airflow can be ensured, which plays a role in guiding and transmitting the incoming air heat dissipation, improving the heat dissipation efficiency. Furthermore, there is no need to set up an additional air duct structure, which further simplifies the structure and reduces the volume of the bidirectional high voltage DC power source.

[0020] (2) The present invention provides a bidirectional high voltage DC power source that realizes the input of electrical signals through a terminal block and the output of electrical signals through positive and negative output terminals, so that the input and output terminals of the bidirectional high voltage DC power source are located on the back plate, which is convenient for maintenance.

[0021] (3) The present invention provides a bidirectional high-voltage DC power source, which allows for easy observation of whether the LED lights are lit normally through the light guide column, thereby determining whether the step-down power board is working properly. In addition, the wire clamp can clamp the light guide column to achieve reliable support for the light guide column.

[0022] (4) The present invention provides a bidirectional high voltage DC power source. The resonant circuit component can convert the high voltage DC power source from 750V to two isolated 550V DC outputs, while the step-down circuit component can connect the two outputs in series and parallel as needed, converting the two isolated 550V DC inputs into a voltage of 0-1000V and a current of 0-60A, with a power of 20kW, and can feed energy back to the power grid. Attached Figure Description

[0023] Figure 1 This is a first view of a bidirectional high-voltage DC source provided in an embodiment of the present invention;

[0024] Figure 2 This is a second view of a bidirectional high-voltage DC source provided in an embodiment of the present invention;

[0025] Figure 3 This is a top view of the bidirectional high-voltage DC source with a hidden cover and rear plate provided in this embodiment of the utility model.

[0026] In all the accompanying drawings, the same reference numerals denote the same technical features, specifically:

[0027] 1. Housing; 11. Ventilation hole; 111. Fan mounting hole; 112. Light guide post mounting hole; 113. L-shaped break; 12. Fan; 13. Light guide post; 131. Cable clamp; 14. Front panel; 15. Rear panel; 16. Cover plate; 17. U-shaped housing; 18. Handle; 181. L-shaped hanging ear; 182. Cabinet mounting hole; 183. Hanging ear mounting hole; 19. Mounting hole; 2. Resonant circuit assembly; 21. Resonant power board; 211. Terminal block; 22. Resonant control board; 3. Step-down circuit assembly; 31. Step-down power board; 311. LED light; 312. Positive output terminal; 313. Negative output terminal; 314. DIP switch; 315. Power socket; 316. CAN1 communication interface; 317. CAN1 communication interface; 32. Step-down control board; 4. Power board; 5. Inserted bent pin. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present utility model and are not intended to limit the present utility model. Furthermore, the technical features involved in the various embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0029] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0031] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0032] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0033] Example:

[0034] Figure 1 This is a first view of a bidirectional high-voltage DC source provided in an embodiment of the present invention. Figure 2 This is a second view of a bidirectional high-voltage DC source provided in an embodiment of the present invention. Figure 3 This is a top view of the bidirectional high-voltage DC source for the hidden cover and rear plate provided in this embodiment of the utility model, combined with... Figures 1-3 As shown, the bidirectional high-voltage DC source includes a housing 1, a resonant circuit assembly 2, and a step-down circuit assembly 3.

[0035] Both the resonant circuit assembly 2 and the step-down circuit assembly 3 are located inside the housing 1.

[0036] The resonant circuit assembly 2 includes at least two resonant circuits, each of which includes a resonant power board 21 and a resonant control board 22. The step-down circuit assembly 3 includes a step-down power board 31 and a step-down control board 32. The two resonant power boards 21 and the step-down power board 31 are installed in parallel at the bottom of the housing 1. Each resonant control board 22 is perpendicularly inserted into the corresponding resonant power board 21, step-down power board 31, and step-down control board 32. Each resonant power board 21 is electrically connected to the step-down power board 31. Each resonant power board 21 is used to receive a high-voltage DC source. The resonant control board 22 is used to convert the high-voltage DC source received by the resonant power board 21 into a low-voltage DC source. The step-down control board 32 is used to convert the two low-voltage DC sources received by the step-down power board 31 into one voltage. The two resonant control boards 22 and the step-down control board 32 are arranged in parallel intervals to form a corresponding air duct.

[0037] In the bidirectional high-voltage DC power source provided in this embodiment, since each resonant control board 22 is perpendicularly inserted into the corresponding resonant power board 21, step-down power board 31, and step-down control board 32, and each resonant power board 21 is electrically connected to the step-down power board 31, the layout of multiple circuit boards is simple, the structure formed by the multiple circuit boards is small, the overall structure is more compact, and the power density is high. In addition, the two resonant control boards 22 and the step-down control board 32 are arranged in parallel at intervals, thereby forming multiple air ducts. While performing voltage conversion and processing, the internal airflow can be ensured to flow smoothly, playing a role in guiding and transmitting incoming air heat dissipation, improving heat dissipation efficiency, and eliminating the need for additional air duct structures, further simplifying the structure and reducing the volume of the bidirectional high-voltage DC power source.

[0038] As for the resonant circuit component 2 and the step-down circuit component 3, each resonant power board 21 serves to receive a high-voltage DC source, while the resonant control board 22 can convert the high-voltage DC source received by the resonant power board 21 into a low-voltage DC source. Finally, the step-down control board 32 can convert the two low-voltage DC sources received by the step-down power board 31 into one voltage, which is then output to the outside through the step-down power board 31, thereby achieving precise voltage regulation.

[0039] In other words, the bidirectional high-voltage DC power source provided by this utility model embodiment is not only simple and compact in structure and small in overall size, but also improves heat dissipation efficiency.

[0040] Preferably, the resonant circuit assembly 2 includes at least two resonant circuits.

[0041] For example, the resonant circuit component 2 can convert the high-voltage DC source from 750V to two isolated 550V DC outputs, while the step-down circuit component 3 can connect the two outputs in series and parallel as needed, converting the two isolated 550V DC inputs into a voltage of 0-1000V and a current of 0-60A, with a power of 20kW, and can feed energy back to the grid.

[0042] In addition, each resonant control board 22 is vertically connected to the corresponding resonant power board 21, buck power board 31 and buck control board 32 through the insertion bent pin 5, thereby achieving both conduction and connection.

[0043] In one embodiment of this utility model, the housing 1 includes a front plate 14, a rear plate 15, a cover plate 16, and a U-shaped shell 17, and the front plate 14, the rear plate 15, the cover plate 16, and the U-shaped shell 17 form a space for accommodating the resonant circuit assembly 2 and the step-down circuit assembly 3.

[0044] For example, the enclosure 1 adopts a 2U standard chassis design, adaptable to a 19-inch standard rack, offering strong versatility and convenient installation. The front panel 14 and the cover plate 16 are offset by an L-shaped gap 113, allowing for interlocking insertion of the front panel 14 and the cover plate 16. Both the cover plate 16 and the U-shaped housing 17 are provided with mounting holes 19, which are M3 countersunk holes, for securing either the cover plate 16 or the U-shaped housing 17.

[0045] Furthermore, two parallel and spaced handles 18 are provided on both sides of the U-shaped shell 17 to facilitate pulling out the box 1.

[0046] For example, the handle 18 is made of stainless steel and has a U-shaped structure. Each handle 18 is mounted on the U-shaped housing 17 via an L-shaped lug 181. The L-shaped lug 181 is provided with a cabinet fixing hole 182 and a lug fixing hole 183. The cabinet fixing hole 182 is an oblong hole, with four symmetrical holes on the left and right sides, used to lock the box 1 to the external cabinet. The oblong holes allow for a certain amount of floating space when installing screws, making it easier to align and fix, and facilitating assembly. The lug fixing hole 183 is an M4 countersunk hole, used to install the L-shaped lug 181 onto the U-shaped housing 17.

[0047] In this embodiment, the bidirectional high-voltage DC power source also includes a power supply board 4, which is located inside the housing 1. The power supply board 4 is used to power the resonant circuit assembly 2 and the buck circuit assembly 3. The power supply board 4 can power other circuit boards without requiring external power.

[0048] For example, the power board 4 is fixed to the bottom of the housing 1, parallel to the resonant power board 21 and the buck power board 31.

[0049] See also Figure 2 and Figure 3 The two opposite side panels of the box body 1 are provided with ventilation holes 11, and each ventilation hole 11 is directly facing the air duct. The inner wall of the box body 1 has multiple fans 12 arranged at intervals, and each fan 12 is arranged directly facing the corresponding ventilation hole 11.

[0050] In the above embodiment, the ventilation holes 11 enable communication between each air duct and the outside air, increasing heat dissipation efficiency. The fan 12 further improves airflow efficiency, preventing the circuit boards from overheating.

[0051] For example, there are 3 sets of ventilation holes 11. Each fan 12 is located on the front panel 14. For each ventilation hole 11 on the front panel 14, there are 4 fan mounting holes 111, that is, one fan mounting hole 111 every 90°, and they are arranged in a circular radial pattern. The fan 12 is locked to the fan mounting hole 111 by countersunk self-tapping screws for forced air cooling inside the housing 1.

[0052] In this embodiment, the resonant circuit assembly 2 is located on one side of the inner cavity of the housing 1, and the step-down circuit assembly 3 is located on the other side of the inner cavity of the housing 1. This allows the entire interior of the housing 1 to be divided according to function, with the resonant circuit assembly 2 and the step-down circuit assembly 3 isolated on the left and right sides. The layout is reasonable and easy to maintain.

[0053] In one embodiment of this utility model, one side panel (i.e., the rear panel 15) of the housing 1 is provided with a terminal plate opening, a positive output terminal opening f, and a negative output terminal opening g. The terminal plate opening, the positive output terminal opening, and the negative output terminal opening are arranged at intervals. A terminal plate 211 is inserted into the terminal plate opening. The two terminals of the terminal plate 211 are electrically connected to the positive and negative terminals of the two resonant power boards 21, respectively. A positive output terminal 312, which is electrically connected to the positive terminal of the step-down power board 31, is inserted into the positive output terminal opening f. A negative output terminal 313, which is electrically connected to the negative terminal of the step-down power board 31, is inserted into the negative output terminal opening g. Thus, the input of electrical signals is realized through the terminal plate 211, and the output of electrical signals is realized through the positive output terminal 312 and the negative output terminal 313. This makes the input and output terminals of the bidirectional high voltage DC source located on the same side panel, which is convenient for maintenance.

[0054] For example, terminal block 211 is a 3-pin terminal for 750V DC input, wherein pin 1 and pin 3 are the positive input and negative input, respectively.

[0055] In addition, the rear panel 15 is provided with multiple openings, corresponding to rear panel ventilation holes a, DIP switch opening b corresponding to the DIP switch 314, power socket opening c corresponding to the power socket 315, CAN1 opening d corresponding to the CAN1 communication interface 316, and CAN2 opening e corresponding to the CAN2 communication interface 317, etc., for exposing the corresponding output interfaces on the step-down power board 31 for convenient external output. Rear panel ventilation holes a are honeycomb-shaped through holes for heat dissipation and air exhaust, with a high opening ratio.

[0056] In this embodiment, an LED lamp 311 is provided on the step-down power board 31, and a light guide column 13 is inserted into the housing 1. One end of the light guide column 13 extends out of the housing 1, and the other end of the light guide column 13 extends into the housing 1 and is arranged opposite to the LED lamp 311. The light guide column 13 makes it easy to observe whether the LED lamp 311 is lit normally, thereby determining whether the step-down power board 31 is working normally.

[0057] For example, the front panel 14 is provided with a light guide post fixing hole 112 for inserting the light guide post 13.

[0058] Furthermore, a wire clamp 131 is provided at the other end of the light guide post 13, and the bottom of the wire clamp 131 is installed at the bottom of the housing 1. The wire clamp 131 can clamp the light guide post 13, thereby achieving reliable support for the light guide post 13.

[0059] For example, the wire clamp 131 is provided with an M4 through hole and is locked to the press-fit stud in the housing 1.

[0060] For example, each resonant power board 21 and buck power board 31 is provided with a heat sink, thereby achieving further heat dissipation of the resonant power board 21 and buck power board 31.

[0061] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A bidirectional high-voltage direct current source, characterized in that, The bidirectional high-voltage DC source includes a housing, a resonant circuit assembly, and a step-down circuit assembly. Both the resonant circuit assembly and the buck circuit assembly are located inside the housing. The resonant circuit assembly includes at least two resonant circuits, each of which includes a resonant power board and a resonant control board. The step-down circuit assembly includes a step-down power board and a step-down control board. The two resonant power boards and the step-down power board are mounted parallel to each other at the bottom of the housing. Each resonant control board is perpendicularly inserted into the corresponding resonant power board, step-down power board, and step-down control board. Each resonant power board is electrically connected to the step-down power board. Each resonant power board receives a high-voltage DC source. The resonant control board converts the high-voltage DC source received by the resonant power board into a low-voltage DC source. The step-down control board converts the two low-voltage DC sources received by the step-down power board into a single voltage. The two resonant control boards and the step-down control board are arranged in parallel intervals to form corresponding air ducts.

2. The bidirectional high-voltage DC source according to claim 1, characterized in that, The bidirectional high-voltage DC power source also includes a power supply board located inside the housing, which is used to supply power to the resonant circuit assembly and the buck circuit assembly.

3. The bidirectional high-voltage DC source according to claim 1, characterized in that, The box body has ventilation holes on two opposite side panels, each ventilation hole facing the air duct. The inner wall of the box body has multiple spaced fans, each fan facing the corresponding ventilation hole.

4. A bidirectional high-voltage DC source according to claim 1, characterized in that, The resonant circuit assembly is located on one side of the inner cavity of the housing, and the step-down circuit assembly is located on the other side of the inner cavity of the housing.

5. A bidirectional high-voltage DC source according to claim 1, characterized in that, One side panel of the housing is provided with a terminal block opening, a positive output terminal opening, and a negative output terminal opening. The terminal block opening, the positive output terminal opening, and the negative output terminal opening are arranged at intervals. A terminal block is inserted into the terminal block opening, and the two terminals of the terminal block are electrically connected to the positive and negative terminals of the two resonant power boards, respectively. A positive output terminal that is electrically connected to the positive terminal of the step-down power board is inserted into the positive output terminal opening, and a negative output terminal that is electrically connected to the negative terminal of the step-down power board is inserted into the negative output terminal opening.

6. A bidirectional high-voltage DC source according to claim 1, characterized in that, The step-down power board is equipped with an LED light, and a light guide column is inserted into the housing. One end of the light guide column extends out of the housing, and the other end extends into the housing and is arranged opposite to the LED light.

7. A bidirectional high-voltage DC source according to claim 6, characterized in that, A wire clamp is provided at the other end of the light guide post, and the bottom of the wire clamp is installed at the bottom of the box body.

8. A bidirectional high-voltage DC source according to any one of claims 1 to 7, characterized in that, Each of the resonant power boards and the step-down power boards is equipped with a heat sink.

9. A bidirectional high-voltage DC source according to any one of claims 1 to 7, characterized in that, The housing includes a front plate, a rear plate, a cover plate, and a U-shaped shell, and the front plate, the rear plate, the cover plate, and the U-shaped shell form a space for accommodating the resonant circuit assembly and the buck circuit assembly.

10. A bidirectional high-voltage DC source according to claim 9, characterized in that, The U-shaped shell has two parallel, spaced handles on both sides.

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