Power conversion device

Abstract

The utility model discloses a kind of power conversion devices, it is related to power electronics technical field, including cabinet, power module and alternating current output module;Installation cavity is formed in cabinet, and with front side and back side, left side and right side;Power module is located in installation cavity, and at least two power modules are spaced distribution along the direction of left side to right side of cabinet;Alternating current output module is located in installation cavity;Power module includes power component and electric reactor;Electric reactor is located in the back of power component, and is connected with power component;Alternating current output module is located between the electric reactor of at least two power modules, and is connected with the electric reactor of at least two power modules.This scheme can improve the layout of internal components of power conversion device, to improve space utilization, reach the purpose of reducing volume and the use amount of conductive row.

Description

Technical Field

[0001] This utility model relates to the field of power electronics technology, and in particular to a power conversion device. Background Technology

[0002] Power conversion devices (such as energy storage converters) are the "central hub" of energy storage systems, responsible for realizing bidirectional conversion and control of electrical energy. They can convert AC power into DC power to store electrical energy, and at the same time, they can convert the stored DC power into AC power to supply power to enterprise equipment.

[0003] In related technologies, the internal component layout of energy storage converters is unreasonable, the connection busbar paths are long, and the structural space utilization rate is low, resulting in a large volume and a high amount of busbar usage. Utility Model Content

[0004] The main purpose of this utility model is to propose a power conversion device that aims to improve the layout of internal components to enhance space utilization and reduce volume and the amount of busbars used.

[0005] To achieve the above objectives, this utility model proposes a power conversion device, comprising:

[0006] The cabinet has an installation cavity formed inside it, and the cabinet has opposing front and rear sides, as well as opposing left and right sides;

[0007] A power module is disposed in the mounting cavity, and the power module has at least two paths, which are distributed at intervals along the left and right sides of the cabinet.

[0008] An AC output module is disposed within the mounting cavity;

[0009] The power module includes:

[0010] Power components;

[0011] A reactor, wherein the reactor is located behind the power component and connected to the power component;

[0012] The AC output module is located between the reactors of at least two of the power modules and is connected to the reactors of at least two of the power modules.

[0013] In one embodiment, the power component includes:

[0014] A capacitor module, wherein the capacitor module comprises two capacitor units;

[0015] A power unit is connected between the two capacitor units and is connected to the reactor.

[0016] In one embodiment, the power unit portion protrudes from the side surface of the capacitor module facing the reactor.

[0017] In one embodiment, the power conversion device further includes:

[0018] At least two sets of DC input modules, one set of the DC input modules is located below the power component of one of the power modules and is connected to the corresponding power component.

[0019] In one embodiment, the power module further includes:

[0020] A first conductive bus connects the DC input module to the power component;

[0021] The second conductive bus connects the power component to the reactor.

[0022] In one embodiment, the first conductive bus includes two first sub-conductive buses, both of which are connected to the DC input module and respectively connected to two capacitor units of the capacitor module.

[0023] In one embodiment, the DC input module includes:

[0024] Two DC input busbars;

[0025] A DC circuit breaker, which is connected to two DC input busbars and two first sub-busbars.

[0026] In one embodiment, the DC input module further includes:

[0027] A DC fuse, one end of which is connected to one of the DC input busbars; the other end of which is connected to the DC circuit breaker.

[0028] In one embodiment, the DC circuit breaker has at least four connecting conductors, one of which is connected to one of the DC input conductors, another of which is connected to the DC fuse, and the remaining two connecting conductors are respectively connected to two first sub-conductors of the first conductor.

[0029] In one embodiment, the AC output module includes:

[0030] An AC circuit breaker, wherein the AC circuit breaker is located between the two reactors;

[0031] A third conductive bus, the third conductive bus being connected to the AC circuit breaker and the two reactors;

[0032] An AC output busbar is provided at the rear of the AC circuit breaker and connected to the AC circuit breaker.

[0033] In one embodiment, the mounting cavity is provided with a partition, which divides the mounting cavity into an isolated upper chamber and a lower chamber. The upper chamber has a heat dissipation duct, an air inlet, and an air outlet, and the heat dissipation duct connects the air inlet and the air outlet.

[0034] The power unit of the power assembly includes a liquid cooling plate and a power device, wherein the power device is disposed on the heat dissipation surface of the liquid cooling plate.

[0035] The power conversion device further includes a first heat exchanger and a first fan disposed in the upper chamber. The first heat exchanger is located in the heat dissipation duct and is connected to the liquid cooling plate through a liquid cooling pipe. The first fan is used to introduce airflow from the air inlet into the heat dissipation duct and to lead the airflow flowing through the first heat exchanger out from the air outlet.

[0036] In one embodiment, the first heat exchanger is an arc-shaped water-air heat exchanger.

[0037] In one embodiment, at least two air outlets are provided, with at least one air outlet provided on the top and back of the cabinet;

[0038] The arc-shaped water-air heat exchanger includes a first heat exchange section and a second heat exchange section connected to each other; the first heat exchange section is arranged opposite to the air outlet on the top of the cabinet so that part of the airflow passes through the first heat exchange section and is then blown out from the air outlet on the top of the cabinet; the second heat exchange section is arranged opposite to the air outlet on the back of the cabinet so that part of the airflow passes through the second heat exchange section and is then blown out from the air outlet on the back of the cabinet.

[0039] In one embodiment, the power conversion device further includes a second heat exchanger and a second fan, wherein a portion of the second heat exchanger is located within the heat dissipation duct of the upper chamber and a portion is located within the lower chamber;

[0040] The second fan, the power component, the reactor, the AC output module, and the DC input module of the power conversion device are all located in the lower chamber. The second fan is used to generate circulating airflow in the lower chamber and blow the circulating airflow from the part of the second heat exchanger located in the lower chamber to the power component, the reactor, the AC output module, and the DC input module, and then back to the part of the second heat exchanger located in the lower chamber.

[0041] This invention provides a power conversion device with at least two branches, enabling the input of at least two different power levels. Direct current (DC) is converted to alternating current (AC) via at least two power modules, then passes through a reactor, and finally merges into a single AC output module. This dual-branch power topology simplifies the structural design by requiring only one AC output module. Furthermore, by rearranging the components of the at least two power modules, the reactor is installed behind the power components, resulting in a more compact arrangement between the power components and the reactor. This allows for the use of shorter busbars to connect the power components and the reactor. Therefore, this design effectively improves the internal component layout of the power conversion device, enhancing space utilization and reducing both size and the amount of busbars used. Attached Figure Description

[0042] 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 the structures shown in these drawings without creative effort.

[0043] Figure 1 A schematic diagram of the structure of an embodiment of the power conversion device provided by this utility model from one perspective;

[0044] Figure 2 A schematic diagram of the structure of an embodiment of the power conversion device provided by this utility model from another perspective;

[0045] Figure 3 A front view of the cabinet interior of an embodiment of the power conversion device provided by this utility model;

[0046] Figure 4 Rear view of the cabinet interior of an embodiment of the power conversion device provided by this utility model;

[0047] Figure 5 A right view of the interior of the cabinet of an embodiment of the power conversion device provided by this utility model;

[0048] Figure 6 for Figure 5 Simplified diagram;

[0049] Figure 7 A partial structural schematic diagram of a power module in one embodiment of the power conversion device provided by this utility model;

[0050] Figure 8A schematic diagram of another part of the power module in one embodiment of the power conversion device provided by this utility model;

[0051] Figure 9 A schematic diagram of the structure of the reactor and AC output module in one embodiment of the power conversion device provided by this utility model;

[0052] Figure 10 A schematic diagram of the first and second heat dissipation ducts in one embodiment of the power conversion device provided by this utility model;

[0053] Figure 11 A schematic diagram of the upper chamber in one embodiment of the power conversion device provided by this utility model;

[0054] Figure 12 A schematic diagram of the partition structure in one embodiment of the power conversion device provided by this utility model;

[0055] Figure 13 A schematic diagram of the structure of the first heat exchanger in one embodiment of the power conversion device provided by this utility model.

[0056] Explanation of icon numbers:

[0057] Reference Name Reference Name 100 Power conversion device 232 Power unit 10 Cabinet body 24 Reactor 11 Mounting cavity 25 Second conductive row 111 Upper chamber 30 AC output module 112 Lower chamber 31 AC circuit breaker 113 First heat dissipation air duct 32 Third conductive row 114 Second heat dissipation air duct 33 AC output conductive row 115 Air inlet 34 AC filter capacitor 116 Air outlet 40 Partition 20 Power module 50 First heat exchanger 21 DC input module 51 First heat exchange section 211 DC input conductive row 52 Second heat exchange section 212 DC fuse 60 Second heat exchanger 213 DC circuit breaker 70 First fan 213a Connection conductive row 80 Second fan 22 First conductive row 90 Third fan 221 First sub-conductive row 110 Auxiliary transformer 23 Power assembly 120 Operation board 231 Capacitor module 130 Control panel 231a Capacitor unit

[0058] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0059] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0060] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0061] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0062] Power conversion devices (such as energy storage converters) are the "central hub" of energy storage systems, responsible for realizing bidirectional conversion and control of electrical energy. They can convert AC power into DC power to store electrical energy, and at the same time, they can convert the stored DC power into AC power to supply power to enterprise equipment.

[0063] In related technologies, the internal component layout of energy storage converters is unreasonable, the connection busbar paths are long, and the structural space utilization rate is low, resulting in a large volume and a high amount of busbar usage.

[0064] Based on the above problems, this utility model proposes a power conversion device 100, which aims to improve the layout of internal components of the power conversion device 100, so as to improve space utilization and reduce volume and the amount of busbars used.

[0065] Please see Figures 1 to 13 In one embodiment of the present invention, the power conversion device 100 includes a cabinet 10, a power module 20, and an AC output module 30; a mounting cavity 11 is formed inside the cabinet 10, and the cabinet 10 has a front side and a rear side, as well as a left side and a right side; the power module 20 is disposed in the mounting cavity 11, and the power module 20 has at least two paths, and the at least two power modules 20 are distributed at intervals along the left side to the right side of the cabinet 10; the AC output module 30 is disposed in the mounting cavity 11.

[0066] Each power module 20 includes a power component 23 and a reactor 24; the reactor 24 is located behind the power component 23 and connected to the power component 23; the AC output module 30 is located between the reactors 24 of at least two power modules 20 and connected to the reactors 24 of at least two power modules 20.

[0067] It should be noted that for each power module 20, the external DC power is connected to the capacitor module 231 of the power component 23 through the DC input module 21. The capacitor module 231 is connected to the power unit 232, and the power unit 232 is connected to the reactor 24. The two power units 232 are connected in parallel to the AC output module 30 through the two reactors 24. In this way, the DC power flows from the DC input module 21 to the capacitor module 231, and then from the capacitor module 231 to the power unit 232. The power unit 232 performs DC-AC conversion, turning the DC power into AC power. After passing through the reactor 24, the AC power is combined into one AC output module 30, thus realizing a dual-branch power topology. For example, when the single-channel input DC power is 1725KW, the combined AC output of the two channels is 3.5MW.

[0068] The technical solution of this utility model designs a power conversion device 100 with at least two branches, enabling it to accept at least two different power levels. Direct current (DC) is converted to alternating current (AC) by the at least two-branch power modules 20, then passes through a reactor 24, and finally merges into a single AC output module 30, achieving a dual-branch power topology. Only one AC output module 30 is needed to achieve AC output, simplifying the structural design. Furthermore, by rearranging the components of the at least two-branch power modules 20, the reactor 24 is installed behind the power assembly 23, resulting in a more compact arrangement between the power assembly 23 and the reactor 24. This allows the use of shorter busbars to connect the power assembly 23 and the reactor 24. Therefore, the above design effectively improves the layout of internal components in the power conversion device 100, increasing space utilization and reducing the size and busbar usage.

[0069] Furthermore, by installing the AC output module 30 between the two reactors 24 of the two power modules 20, the space between the two reactors 24 can be effectively utilized, thereby further improving space utilization and achieving the goal of reducing the overall size of the machine.

[0070] In this embodiment, the cabinet 10 serves as the supporting structure for the entire machine, used to install and fix at least the dual-branch power module 20, AC output module 30, and other structures. In some embodiments, an operation panel 120 may be provided on the front side of the cabinet 10, and a control panel 130 may be provided inside the cabinet 10. The control panel 130 may include terminal blocks, detection boards, power boards, etc., and is located on the same side as the operation panel 120 of the control chassis, providing safety assurance for the entire system.

[0071] At least two-branch power modules 20 are distributed at intervals along the left to right side of the cabinet 10. Specifically, they can be two-branch power modules 20, three-branch power modules 20, etc., depending on the actual application. All components of each branch power module 20 are identical. In some embodiments, when the power module 20 includes two branches, one power module 20 is located near the left side of the cabinet 10, and the other power module 20 is located near the right side of the cabinet 10. Furthermore, the two-branch power modules 20 can be mirror-distributed along the centerline of the cabinet 10, which is more conducive to the rational layout of the components inside the cabinet 10.

[0072] The power component 23 is a module that includes power devices (also known as insulated gate bipolar transistors, IGBTs), a driver board, a water-cooled plate, and a capacitor module 231. The power devices are used to realize DC-AC conversion; the capacitor module 231 is used to realize energy storage and buffering, voltage smoothing, and harmonic absorption.

[0073] The reactor 24 plays a crucial role in the energy storage converter. Its main functions include limiting current, filtering, smoothing current fluctuations, and improving the stability and efficiency of the system.

[0074] Please see Figure 3 , Figures 5 to 8 In one embodiment of the present invention, the power component 23 includes a capacitor module 231 and a power unit 232; the capacitor module 231 includes two capacitor units 231a; the power unit 232 is connected between the two capacitor units 231a and is connected to the reactor 24.

[0075] This configuration, by installing the power unit 232 between the two capacitor units 231a of the capacitor module 231, can further improve the compactness of the layout between the various components, thereby further improving space utilization and reducing the overall size of the device.

[0076] In practical applications, the power unit 232 and the capacitor module 231 can be directly welded together or connected using structural components such as conductive busbars and screws.

[0077] Please see Figure 5 , Figure 8 In one embodiment of the present invention, the power unit 232 protrudes from the side surface of the capacitor module 231 facing the reactor 24.

[0078] By making the power unit 232 protrude from the side surface facing the reactor 24, the distance between the power unit 232 and the reactor 24 can be further shortened, thereby further shortening the length of the conductive busbar connecting the power unit 232 and the reactor 24, so as to reduce the cost of using the conductive busbar.

[0079] It should be noted that the side of the capacitor module 231 facing the reactor 24 is the back of the capacitor module 231, and the side of the power unit 232 facing the reactor 24 is the back of the power unit 232.

[0080] Please see Figures 5 to 7 In one embodiment of the present invention, the power conversion device 100 further includes at least two sets of DC input modules 21. One set of DC input modules 21 is located below the power component 23 of a power module 20 and is connected to the corresponding power component 23.

[0081] This configuration, by placing at least two sets of DC input modules 21 below the power components 23 of at least two power modules 20, allows for a more compact arrangement between the DC input modules 21 and the power components 23. This enables the use of shorter busbars to connect the DC input modules 21 and the power components 23, further improving the layout of internal components in the power conversion device 100, thereby increasing space utilization and further reducing the size and the amount of busbars used.

[0082] The DC input module 21 is a structural component used to introduce DC power, and may include, for example, a DC input busbar 211, a DC circuit breaker 213, etc.

[0083] Please see Figures 5 to 7 In one embodiment of the present invention, the power module 20 further includes a first conductive bus 22 and a second conductive bus 25; the first conductive bus 22 connects the DC input module 21 and the power component 23; the second conductive bus 25 connects the power component 23 and the reactor 24.

[0084] This configuration, employing the first conductive bus 22, facilitates the connection between the DC input module 21 and the power component 23. Furthermore, since the DC input module 21 is mounted below the power component 23, the arrangement between them is more compact, allowing the use of a shorter first conductive bus 22 to connect them, thus reducing the number of first conductive bus 22 units used. Similarly, the second conductive bus 25 facilitates the connection between the power component 23 and the reactor 24. Moreover, since the reactor 24 is mounted behind the power component 23, the arrangement between them is more compact, allowing the use of a shorter second conductive bus 25 to connect them, further reducing the number of second conductive bus 25 units used.

[0085] The first conductive busbar 22 is a conductive busbar structure used to connect the DC input module 21 and the power component 23. The length of the first conductive busbar 22 is determined by the distance between the DC input module 21 and the power component 23. Therefore, by arranging the DC input module 21 and the power component 23 in a reasonable manner, the length of the first conductive busbar 22 can be significantly shortened, thereby effectively reducing the cost of using the conductive busbar.

[0086] The second conductive busbar 25 is a conductive busbar structure used to connect the power component 23 and the reactor 24. The second conductive busbar 25 may include three protruding sections. The length of the second conductive busbar 25 is determined by the distance between the power component 23 and the reactor 24. Therefore, by arranging the power component 23 and the reactor 24 in a reasonable manner, the length of the second conductive busbar 25 can be significantly shortened, thereby effectively reducing the cost of using the conductive busbar.

[0087] In practical applications, the first conductive busbar 22 and the second conductive busbar 25 can be either copper or aluminum.

[0088] Please see Figure 7 In one embodiment of the present invention, the first conductive bus 22 includes two first sub-conductive buses 221, both of which are connected to the DC input module 21 and are respectively connected to two capacitor units 231a of the capacitor module 231.

[0089] This configuration, by employing the design of two first sub-conducting busbars 221, makes it easier to connect the DC input module 21 and the two capacitor units 231a of the capacitor module 231, thereby making it easier to connect the positive and negative currents.

[0090] Please see Figures 5 to 7In one embodiment of the present invention, the DC input module 21 includes two DC input busbars 211 and a DC circuit breaker 213; the DC circuit breaker 213 is connected to the two DC input busbars 211 and two first sub-busbars 221.

[0091] This configuration allows for the introduction of positive and negative DC currents via two DC input busbars 211, which then channel the current into the DC circuit breaker 213. The circuit breaker 213 controls the current in the DC circuit, providing safety protection and preventing damage to equipment and circuits from overload or short circuits. When an overload or short circuit occurs, the current increases dramatically. Without the DC circuit breaker 213 to control the current, the circuit and equipment may be damaged. The DC circuit breaker 213 can promptly detect changes in the current in the circuit and disconnect the circuit when necessary to protect the circuit and equipment.

[0092] Please see Figures 5 to 7 In one embodiment of the present invention, the DC input module 21 further includes a DC fuse 212, one end of which is connected to one of the DC input busbars 211; the other end of which is connected to a DC circuit breaker 213.

[0093] With this configuration, by adding a DC fuse 212 to one side of the DC circuit breaker 213, the purpose of overcurrent protection can be further achieved to prevent damage to the equipment caused by short circuit or overload, making the system work more safely and reliably.

[0094] In practical applications, the DC fuse 212 can be installed on the front, rear, left, or right side of the DC circuit breaker 213. Of course, in some embodiments, to achieve a more reasonable layout, the DC fuse 212 can be installed on the side of the DC circuit breaker 213 furthest from the edge of the cabinet 10. For example, in a power module 20 located near the left side of the cabinet 10, the DC fuse 212 is installed on the right side of the DC circuit breaker 213, while in a power module 20 located near the right side, the DC fuse 212 is installed on the left side of the DC circuit breaker 213. This design makes the arrangement of the DC circuit breaker 213 and the DC fuse 212 more compact, thereby effectively shortening the length of the conductive bar connecting the DC circuit breaker 213 and the DC fuse 212.

[0095] Please see Figure 7 In one embodiment of the present invention, the DC circuit breaker 213 is provided with at least four connecting conductive bars 213a, one of which is connected to one of the DC input conductive bars 211, another connecting conductive bar 213a is connected to the DC fuse 212, and the remaining two connecting conductive bars 213a are respectively connected to the two first sub-conducting bars 221 of the first conductive bar 22.

[0096] This configuration allows the DC circuit breaker 213 to be connected to one of the DC input conductors 211 via one of the connecting conductors 213a, and to the DC fuse 212 via another connecting conductor 213a. Furthermore, the DC circuit breaker 213 is connected to the two first sub-conductors 221 of the first conductor 22 via the remaining two connecting conductors 213a. This design facilitates the connection between the DC circuit breaker 213 and the DC input conductor 211, the DC fuse 212, and the first conductor 22.

[0097] In practical applications, one of the connecting conductors 213a of the DC circuit breaker 213 can be directly connected to one of the DC input conductors 211, or a transfer conductor can be used to achieve the connection. Similarly, the other connecting conductor 213a of the DC circuit breaker 213 can be directly connected to the DC fuse 212, or a transfer conductor can be used to achieve the connection. Likewise, the remaining two connecting conductors 213a of the DC circuit breaker 213 can be directly connected to the two first sub-conductors 221 of the first conductor 22, or a transfer conductor can be used to achieve the connection.

[0098] Please see Figure 5 , Figure 6 , Figure 9 In one embodiment of the present invention, the AC output module 30 includes an AC circuit breaker 31, a third busbar 32 and an AC output busbar 33; the AC circuit breaker 31 is located between two reactors 24; the third busbar 32 connects the AC circuit breaker 31 and the two reactors 24; the AC output busbar 33 is located behind the AC circuit breaker 31 and connected to the AC circuit breaker 31.

[0099] This configuration, by installing the AC circuit breaker 31 between the two reactors 24, effectively utilizes the space between the two reactors 24 and shortens the distance between the AC circuit breaker 31 and the two reactors 24. This, in turn, effectively shortens the length of the third busbar 32, further reducing the operating cost of the busbar. Furthermore, by installing the AC output busbar 33 behind the AC circuit breaker 31, a more rational layout of the AC output busbar 33 and the AC circuit breaker 31 can be achieved, further improving space utilization and reducing the overall size of the unit.

[0100] In practical applications, the third conductive busbar 32 can be either a copper busbar or an aluminum busbar.

[0101] In some embodiments, the cabinet 10 is further provided with an AC filter and a DC filter. The AC filter can be an AC EMI (Electromagnetic Interference) filter, and the DC filter can be a DC EMI filter.

[0102] In some embodiments, please refer to Figure 4 A filter branch is set on the connection circuit between the AC filter and the reactor 24. The filter branch is equipped with an AC filter capacitor 34. The AC filter capacitor 34 is divided into two groups and arranged below the two reactors 24 respectively to achieve a reasonable layout of the structure.

[0103] In some embodiments, the AC circuit breaker 31 is connected to two reactors 24 and located between the two reactors 24. The reactors 24 are fixed on the left and right side brackets inside the cabinet 10, and the AC circuit breaker 31 is installed on the middle bracket of the cabinet 10. The two are connected by a third conductive busbar 32.

[0104] Please see Figures 10 to 13 In one embodiment of the present invention, a partition 40 is provided in the mounting cavity 11, which divides the mounting cavity 11 into an isolated upper chamber 111 and a lower chamber 112. A heat dissipation duct, an air inlet 115, and an air outlet 116 are formed in the upper chamber 111. The heat dissipation duct connects the air inlet 115 and the air outlet 116. The power unit 232 of the power component 23 includes a liquid cooling plate and a power device. The power device is disposed on the heat dissipation surface of the liquid cooling plate. The power conversion device 100 also includes a first heat exchanger 50 and a first fan 70 disposed in the upper chamber 111. The first heat exchanger 50 is located in the heat dissipation duct and is connected to the liquid cooling plate through a liquid cooling pipe. The first fan 70 is used to introduce airflow from the air inlet 115 into the heat dissipation duct and to draw the airflow flowing through the first heat exchanger 50 out from the air outlet 116.

[0105] With this configuration, the mounting cavity 11 of the cabinet 10 is divided into an isolated upper chamber 111 and a lower chamber 112 by a partition 40, forming a heat dissipation duct in the upper chamber 111. The upper chamber 111 is also equipped with a first heat exchanger 50 and a first fan 70. The liquid cooling plate of the power unit 232 is connected to the first heat exchanger 50 through a liquid cooling pipe, so that the heat generated by the power device during operation can be transferred to the liquid cooling plate. The heat absorbed by the liquid cooling plate is then transferred to the first heat exchanger 50 in the heat dissipation duct through the liquid cooling pipe. Thus, under the operation of the first fan 70, airflow can be introduced from the air inlet 115 into the heat dissipation duct of the upper chamber 111 and flow through the first heat exchanger 50 in the heat dissipation duct to cool the first heat exchanger 50. The airflow after absorbing heat is finally blown out from the air outlet 116. By repeating this process, the power device can be effectively cooled, thereby extending the functionality and service life of the power device.

[0106] In some embodiments, in order to improve the heat dissipation efficiency of the internal components of the cabinet 10, at least two air inlets 115 and at least two first fans 70 are provided for at least two power modules 20, so that a first fan 70 is provided at each air inlet 115, and at least two first fans 70 are distributed at intervals along the left side to the right side of the cabinet 10.

[0107] In practical applications, the shape of the partition 40 is not specifically limited here, but is set according to the layout space of the components inside the cabinet.

[0108] Please see Figure 10 , Figure 11 In one embodiment of this utility model, the first heat exchanger 50 is an arc-shaped water-air heat exchanger.

[0109] This configuration, by designing the first heat exchanger 50 as an arc-shaped water-air heat exchanger, can effectively increase the heat dissipation area of ​​the first heat exchanger 50, thereby effectively increasing the heat exchange area between the first heat exchanger 50 and the liquid cooling plate, thus improving the heat dissipation efficiency of the power devices. At the same time, it can increase the heat exchange area between the first heat exchanger 50 and the airflow, thereby improving the heat dissipation efficiency of the airflow on the first heat exchanger 50.

[0110] In some embodiments, the upper chamber 111 may also be provided with a liquid cooling system, which includes a water tank, a water pump, water pipes and other structures, to provide circulating refrigerant to the arc-shaped water-air heat exchanger through the liquid cooling system.

[0111] Please see Figure 2 , Figure 10 , Figure 11 In one embodiment of this utility model, at least two air outlets 116 are provided, and at least one air outlet 116 is provided on the top and back of the cabinet 10; the arc-shaped water-air heat exchanger includes a first heat exchange section 51 and a second heat exchange section 52 connected to each other; the first heat exchange section 51 is arranged opposite to the air outlet 116 on the top of the cabinet 10 so that part of the airflow passes through the first heat exchange section 51 and is blown out from the air outlet 116 on the top of the cabinet 10; the second heat exchange section 52 is arranged opposite to the air outlet 116 on the back of the cabinet 10 so that part of the airflow passes through the second heat exchange section 52 and is blown out from the air outlet 116 on the back of the cabinet 10.

[0112] With this configuration, the liquid cooling plate absorbs the heat from the power devices and transfers it to the first heat exchanger 50 through the liquid cooling pipes. Under the operation of the first fan 70, the external airflow is introduced into the heat dissipation duct of the upper chamber 111 from the air inlet 115 and flows through the first heat exchange section 51 and the second heat exchange section 52 of the first heat exchanger 50. Part of the airflow flows through the first heat exchange section 51 and absorbs the heat of the first heat exchange section 51, and finally blows out from the air outlet 116 at the top of the cabinet 10. At the same time, part of the airflow flows through the second heat exchange section 52 and absorbs the heat of the second heat exchange section 52, and finally blows out from the air outlet 116 at the back of the cabinet 10, thereby achieving the effect of rapid cooling of the first heat exchanger 50.

[0113] Please see Figure 10 , Figure 11 In one embodiment of the present invention, the power conversion device 100 further includes a second heat exchanger 60 and a second fan 80. Part of the second heat exchanger 60 is located in the heat dissipation duct of the upper chamber 111, and part is located in the lower chamber 112. The second fan 80, the power component 23, the reactor 24, the AC output module 30, and the DC input module 21 of the power conversion device 100 are all located in the lower chamber 112. The second fan 80 is used to generate circulating airflow in the lower chamber 112 and blow the circulating airflow from the location of the part of the second heat exchanger 60 located in the lower chamber 112 to the power component 23, the reactor 24, the AC output module 30, and the DC input module 21, and then return to the location of the part of the second heat exchanger 60 located in the lower chamber 112.

[0114] With this configuration, by placing part of the second heat exchanger 60 within the heat dissipation duct of the upper chamber 111 and part within the lower chamber 112, the second fan 80 generates a circulating airflow within the lower chamber 112. This circulating airflow blows from the portion of the second heat exchanger 60 located in the lower chamber 112 towards the power assembly 23, reactor 24, AC output module 30, and DC input module 21, before returning to the portion of the second heat exchanger 60 located in the lower chamber 112. When the airflow returns to this portion, the heat absorbed in the airflow is transferred to the portion of the second heat exchanger 60 located in the lower chamber 112, and then to the portion of the second heat exchanger 60 located in the upper chamber 111. Since part of the second heat exchanger 60 is located in the upper chamber 111... Within the heat dissipation duct of the cabinet 11, the airflow generated by the first fan 70 carries away some of the heat from the structure of the second heat exchanger 60 located in the upper chamber 111. This cycle reduces the heat generated during operation of the power components 23, reactor 24, AC output module 30, and DC input module 21 in the lower chamber 112, enabling sufficient heat dissipation for most or even all components inside the cabinet 10. Furthermore, there is no need to design a separate heat dissipation duct for the reactor 24, thus eliminating the need for additional fans and related structural components, reducing size and cost. The reduced number of fans also reduces noise. Compared to traditional enclosed ducts, the reactor 24's conductive busbars no longer need to extend from the sealing kit, further reducing costs.

[0115] In some embodiments, the second heat exchanger 60 is an air-to-air heat exchanger, which is filled with a cooling medium. When hot air in the lower chamber 112 blows across the portion of the second heat exchanger 60 located in the lower chamber 112, the cooling medium absorbs heat and then transfers it to the portion of the second heat exchanger 60 located in the upper chamber 111. Then, when the airflow generated by the first fan 70 flows through the heat dissipation duct, it can carry away the heat from the portion of the second heat exchanger 60 located in the upper chamber 111. This cycle can reduce the heat generated by the power components 23, reactor 24, AC output module 30, and DC input module 21 in the lower chamber 112 during operation.

[0116] In practical applications, the number of second fans 80 is not specifically limited here; it can be 2, 3, 4, 5, 6, 7, 8, etc.

[0117] In some embodiments, the second fan 80 may be positioned near the top of the lower chamber 112 to achieve a reasonable structural layout.

[0118] In some embodiments, a third fan 90 may also be provided in the lower chamber 112. The design of the third fan 90 can better blow the circulating airflow in the lower chamber 112 from the location of the second heat exchanger 60 in the lower chamber 112 to the DC input module 21 and then back to the location of the second heat exchanger 60 in the lower chamber 112, thereby improving the heat dissipation effect on the DC input module 21.

[0119] In practical applications, the number of third fans 90 is not specifically limited, and can be 2, 3, 4, 5, 6, 7, 8, etc.

[0120] In some embodiments, an auxiliary transformer 110 may also be provided inside the cabinet 10. The auxiliary transformer 110 is designed to power the fans of the cooling system (such as the first fan 70, the second fan 80, and the third fan 90). The auxiliary transformer 110 is installed at the bottom of the lower chamber 112 to achieve a reasonable structural layout.

[0121] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A power conversion device, characterized in that, include: The cabinet has an installation cavity formed inside it, and the cabinet has opposing front and rear sides, as well as opposing left and right sides; A power module is disposed in the mounting cavity, and the power module has at least two paths, which are distributed at intervals along the left and right sides of the cabinet. An AC output module is disposed within the mounting cavity; The power module includes: Power components; A reactor, wherein the reactor is located behind the power component and connected to the power component; The AC output module is located between the reactors of at least two of the power modules and is connected to the reactors of at least two of the power modules.

2. The power conversion device as described in claim 1, characterized in that, The power component includes: A capacitor module, wherein the capacitor module comprises two capacitor units; A power unit is connected between the two capacitor units and is connected to the reactor.

3. The power conversion device as described in claim 2, characterized in that, The power unit portion protrudes from the side surface of the capacitor module facing the reactor.

4. The power conversion device according to any one of claims 1 to 3, characterized in that, The power conversion device further includes: At least two sets of DC input modules, one set of the DC input modules is located below the power component of one of the power modules and is connected to the corresponding power component.

5. The power conversion device as described in claim 4, characterized in that, The power module also includes: A first conductive bus connects the DC input module to the power component; The second conductive bus connects the power component to the reactor.

6. The power conversion device as described in claim 5, characterized in that, The first conductive bus includes two first sub-conductive buses, both of which are connected to the DC input module and respectively connected to two capacitor units of the capacitor module.

7. The power conversion device as described in claim 6, characterized in that, The DC input module includes: Two DC input busbars; A DC circuit breaker, which is connected to two DC input busbars and two first sub-busbars.

8. The power conversion device as described in claim 7, characterized in that, The DC input module also includes: A DC fuse, one end of which is connected to one of the DC input busbars; the other end of which is connected to the DC circuit breaker.

9. The power conversion device as described in claim 8, characterized in that, The DC circuit breaker is provided with at least four connecting conductors, one of which is connected to one of the DC input conductors, another of which is connected to the DC fuse, and the remaining two connecting conductors are respectively connected to the two first sub-conductors of the first conductor.

10. The power conversion device according to any one of claims 1 to 9, characterized in that, The AC output module includes: An AC circuit breaker, wherein the AC circuit breaker is located between the two reactors; A third conductive bus, the third conductive bus being connected to the AC circuit breaker and the two reactors; An AC output busbar is provided at the rear of the AC circuit breaker and connected to the AC circuit breaker.

11. The power conversion device according to any one of claims 1 to 9, characterized in that, The mounting cavity is provided with a partition, which divides the mounting cavity into an isolated upper chamber and a lower chamber. The upper chamber has a heat dissipation duct, an air inlet, and an air outlet. The heat dissipation duct connects the air inlet and the air outlet. The power unit of the power assembly includes a liquid cooling plate and a power device, wherein the power device is disposed on the heat dissipation surface of the liquid cooling plate. The power conversion device further includes a first heat exchanger and a first fan disposed in the upper chamber. The first heat exchanger is located in the heat dissipation duct and is connected to the liquid cooling plate through a liquid cooling pipe. The first fan is used to introduce airflow from the air inlet into the heat dissipation duct and to lead the airflow flowing through the first heat exchanger out from the air outlet.

12. The power conversion device as described in claim 11, characterized in that, The first heat exchanger is an arc-shaped water-air heat exchanger.

13. The power conversion device as described in claim 12, characterized in that, The air outlet is provided with at least two, and at least one air outlet is provided on the top and back of the cabinet; The arc-shaped water-air heat exchanger includes a first heat exchange section and a second heat exchange section connected to each other; the first heat exchange section is arranged opposite to the air outlet on the top of the cabinet so that part of the airflow passes through the first heat exchange section and is then blown out from the air outlet on the top of the cabinet; the second heat exchange section is arranged opposite to the air outlet on the back of the cabinet so that part of the airflow passes through the second heat exchange section and is then blown out from the air outlet on the back of the cabinet.

14. The power conversion device as described in claim 11, characterized in that, The power conversion device further includes a second heat exchanger and a second fan. Part of the second heat exchanger is located in the heat dissipation duct of the upper chamber, and part is located in the lower chamber. The second fan, the power component, the reactor, the AC output module, and the DC input module of the power conversion device are all located in the lower chamber. The second fan is used to generate circulating airflow in the lower chamber and blow the circulating airflow from the part of the second heat exchanger located in the lower chamber to the power component, the reactor, the AC output module, and the DC input module, and then back to the part of the second heat exchanger located in the lower chamber.

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