Power conversion apparatus

Abstract

Disclosed in the present application is a power conversion apparatus, comprising a first cavity, a second cavity and a heat dissipator, wherein a power device is provided in the first cavity; the heat dissipator comprises an evaporator and a condenser, which forms a circulating flow path with the evaporator, the evaporator being configured to absorb heat of the power device; the condenser is located in the second cavity, and the second cavity can allow air to flow through the condenser to cool the condenser; and a magnetic device is provided outside the second cavity. In the power conversion apparatus, the heat dissipator is used to perform heat dissipation on the power device, such that the heat dissipation capacity is effectively improved, and a heat dissipation requirement of the power conversion apparatus can be met; the magnetic device is externally arranged relative to the condenser, such that the second cavity has a relatively small size, thereby facilitating the mounting, disassembly and maintenance of the second cavity; a heat dissipation effect for the magnetic device can be improved; mutual interference between heat dissipation of the magnetic device and heat dissipation of the condenser can also be avoided; and the flexibility of structural layout of the power conversion apparatus can also be improved.

Description

A power conversion device

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on December 30, 2023, with application number 202323669797.8 and invention name “A Power Conversion Device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of heat dissipation of power electronic equipment, and more specifically, to a power conversion device. Background Art

[0003] As the power density of power conversion equipment such as inverters and PCS (energy storage converters) continues to increase, the heat generated by power conversion equipment is getting higher and higher, especially the heat generated by power devices in the cavity, which makes the power conversion equipment have higher and higher requirements for heat dissipation capacity.

[0004] At present, power conversion equipment mainly adopts forced air cooling for heat dissipation, but the heat dissipation capacity of forced air cooling is difficult to improve, resulting in forced air cooling being difficult to meet the heat dissipation needs of power conversion equipment with continuously increasing power density.

[0005] In summary, how to design the heat dissipation of a power conversion device to improve the heat dissipation capability and meet the heat dissipation requirements of the power conversion device is an urgent problem to be solved by those skilled in the art.

[0006] Summary of the Invention

[0007] In view of this, the purpose of this application is to provide a power conversion device to improve the heat dissipation capability and meet the heat dissipation requirements of the power conversion device.

[0008] In order to achieve the above objectives, this application provides the following technical solutions:

[0009] A power conversion device comprises: a first cavity, a second cavity, and a heat sink;

[0010] Wherein, a power device is provided in the first cavity;

[0011] The radiator includes an evaporator and a condenser forming a circulation flow path with the evaporator, wherein the evaporator is used to absorb heat from the power device;

[0012] The condenser is located in the second cavity, and the second cavity can allow air to flow through the condenser to cool the condenser; a magnetic device is arranged outside the second cavity.

[0013] Optionally, the evaporator is located in the second cavity.

[0014] Optionally, the second cavity includes a connected top cavity and a side cavity, wherein the top cavity is located at the top of the first cavity, the side cavity is located at the side of the first cavity, the evaporator is located in the side cavity, and the condenser is located in the top cavity.

[0015] Optionally, the evaporator is located in the first cavity.

[0016] Optionally, the evaporator is in contact with an inner wall of the first cavity, or there is a gap between the evaporator and the inner wall of the first cavity.

[0017] Optionally, the power conversion device further includes a first fan for driving air to flow through the condenser.

[0018] Optionally, the magnetic device is located outside the first cavity.

[0019] Optionally, the second cavity has a second cavity air inlet and a second cavity air outlet;

[0020] The magnetic device is opposite to the air inlet of the second cavity so that the air flow dissipates heat to the magnetic device before entering the air inlet of the second cavity; or, the magnetic device is opposite to the air outlet of the second cavity so that the air flow discharged from the air outlet of the second cavity dissipates heat to the magnetic device.

[0021] Optionally, the power conversion device further includes a third cavity, the magnetic component is located in the third cavity, and the third cavity can allow air to flow through the magnetic component to cool the magnetic component.

[0022] Optionally, the power conversion device further includes a second fan for driving air to flow through the magnetic device.

[0023] Optionally, when the power conversion device further includes a first fan for driving air to flow through the condenser, the first fan is located outside the second cavity, and the second fan is located outside the third cavity;

[0024] The first fan and the second fan are the same fan, and the third cavity and the second cavity share the fan assembly.

[0025] Optionally, the third cavity and the second cavity are arranged in parallel or in series;

[0026] And / or, there are at least two third cavities, and all of the third cavities are distributed on at least two sides of the second cavity.

[0027] Optionally, the magnetic device is located in the first cavity.

[0028] In the power conversion equipment provided by the present application, a radiator is used to dissipate heat from the power device, which effectively improves the heat dissipation capacity compared with the air-cooled heat dissipation in the prior art and can meet the heat dissipation requirements of the high power density of the power conversion equipment; the magnetic device is placed outside the condenser, so that the volume of the second cavity is smaller, which facilitates the installation, disassembly and maintenance of the second cavity; the magnetic device and the condenser are not in the same cavity, so that the magnetic device can be cooled separately, which can improve the heat dissipation effect of the magnetic device and avoid mutual interference between the heat dissipation of the magnetic device and the heat dissipation of the condenser, so that the condenser and the magnetic device can obtain better heat dissipation effect; the magnetic device can be ignored in the process of designing and installing the condenser, and the condenser can be ignored in the process of designing and installing the magnetic device, which can improve the flexibility of the structural layout of the power conversion equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without any creative work.

[0030] FIG1 is a schematic structural diagram of a power conversion device provided in Example 1 of the present application;

[0031] FIG2 is another schematic structural diagram of a power conversion device provided in Example 1 of the present application;

[0032] FIG3 is another schematic diagram of the structure of the power conversion device provided in Example 1 of the present application;

[0033] FIG4 is another schematic diagram of the structure of the power conversion device provided in Example 1 of the present application;

[0034] FIG5 is a schematic structural diagram of a power conversion device provided in Example 2 of the present application;

[0035] FIG6 is a front view of another structure of a power conversion device provided in Example 2 of the present application;

[0036] FIG7 is a side view of the power conversion device shown in FIG6;

[0037] FIG8 is a top view of the power conversion device shown in FIG6 ;

[0038] FIG9 is a schematic structural diagram of a power conversion device provided in Example 3 of the present application;

[0039] FIG10 is another structural diagram of the power conversion device provided in Example 3 of the present application.

[0040] Description of reference numerals:

[0041] 1 is the first cavity, 101 is the back plate, 2 is the second cavity, 201 is the air inlet of the second cavity, 202 is the air outlet of the second cavity, 203 is the top cavity, 204 is the side cavity, 3 is the condenser, 4 is the evaporator, 5 is the first fan, 6 is the power device, 7 is the magnetic device, 8 is the third cavity, 801 is the air inlet of the third cavity, 802 is the air outlet of the third cavity, 9 is the second fan, and 10 is the fan. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0043] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. The terms used in the following embodiments are only for the purpose of describing specific embodiments and are not intended to be limiting of the present application. As used in the specification and appended claims of the present application, the singular expressions "one", "a kind of", "said", "above", "the" and "this" are intended to also include expressions such as "one or more", unless there is a clear contrary indication in the context. It should also be understood that in the embodiments of the present application, "one or more" refers to one, two or more; "and / or" describes the association relationship of associated objects, indicating that three relationships may exist; for example, A and / or B can represent: the existence of A alone, the existence of A and B at the same time, and the existence of B alone, where A and B can be singular or plural. The character " / " generally indicates that the related objects before and after are in an "or" relationship.

[0044] References to "one embodiment" or "some embodiments" in this specification mean that a particular feature, structure, or characteristic described in conjunction with that embodiment is included in one or more embodiments of the present application. Thus, phrases such as "in one embodiment," "in some embodiments," "in other embodiments," and "in yet other embodiments" appearing in various places in this specification do not necessarily refer to the same embodiment, but rather mean "one or more but not all embodiments," unless otherwise specifically emphasized. The terms "including," "comprising," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0045] The "multiple" involved in the embodiments of the present application means greater than or equal to two. It should be noted that in the description of the embodiments of the present application, the words "first" and "second" are only used for the purpose of distinguishing the description and cannot be understood as indicating or implying relative importance or order.

[0046] As shown in FIG. 1 to FIG. 10 , the power conversion device provided in the embodiment of the present application includes: a first cavity 1 , a second cavity 2 , and a heat sink (not marked in the figures).

[0047] A power device 6 is disposed in the first cavity 1. The power device 6 includes an IGBT (Insulate-Gate Bipolar Transistor) and the like. This embodiment does not limit the specific type and structure of the power device 6.

[0048] In actual situations, other devices such as resistors, capacitors, chips, etc. may also be placed in the first cavity 1, which is not limited in this embodiment. It should be noted that a resistor is a type of magnetic device.

[0049] The first cavity 1 can be a sealed cavity or a high-protection cavity with high protection performance.

[0050] The radiator includes an evaporator 4 and a condenser 3 forming a circulation flow path with the evaporator 4 .

[0051] It should be noted that the evaporator 4 and condenser 3 form a circulation flow path through a gas-phase pipeline and a liquid-phase pipeline. The gas-phase pipeline connects the outlet of the evaporator 4 and the inlet of the condenser 3, and the liquid-cooling pipeline connects the outlet of the condenser 3 and the inlet of the evaporator 4. The circulation flow path contains a phase-change working fluid. To facilitate the circulation of the phase-change working fluid, the condenser 3 and evaporator 4 can be arranged at the same height, or the condenser 3 can be higher than the evaporator 4.

[0052] The heat dissipation principle of the radiator is as follows: the phase change medium in the evaporator 4 absorbs heat and changes from liquid to gas phase. The gas enters the condenser 3 along the gas phase pipeline, releases heat and condenses into liquid in the condenser 3, and flows back to the evaporator 4 through the liquid phase pipeline to realize circulation.

[0053] The evaporator 4 is used to absorb the heat of the power device 6. Of course, the evaporator 4 can also absorb the heat of other heating devices in the first cavity 1, which is not limited in this embodiment.

[0054] The evaporator 4 is used to be in direct contact with the power device 6 or the evaporator 4 is used to be in indirect contact with the power device 6 via a heat conducting member.

[0055] The condenser 3 is located in the second cavity 2 , and the second cavity 2 can allow air to flow through the condenser 3 to cool the condenser 3 .

[0056] The condenser 3 may be a parallel flow condenser or other types, which is not limited in the present embodiment. The type of the evaporator 4 is also not limited in the present embodiment.

[0057] The second cavity 2 has a second cavity air inlet 201 and a second cavity air outlet 202. The second cavity 2 can be connected to the external environment of the entire power conversion device, or to other cavities in the power conversion device except the first cavity 1, as long as it can ensure that the condenser 3 can be cooled.

[0058] In order to improve the cooling efficiency, the second cavity 2 may be selected as an open cavity, and the second cavity 2 is connected to the external environment of the power conversion device.

[0059] The relative positional relationship between the second cavity 2 and the first cavity 1 is selected according to actual conditions and is not limited in this embodiment.

[0060] In the above-mentioned power conversion equipment, a radiator is used to dissipate heat from the power device 6. Compared with the existing technology using air cooling, the heat dissipation capacity is effectively improved, and the heat dissipation requirements of the power conversion equipment can be met, especially the heat dissipation requirements of the power conversion equipment with high power density. It can solve the problem of insufficient traditional air cooling heat dissipation capacity as the power density increases.

[0061] In the above power conversion device, a magnetic device 7 is provided outside the second cavity 2. The magnetic device 7 may include a device such as a reactor, and the specific type of the magnetic device 7 is not limited in this embodiment.

[0062] It should be noted that, when a magnetic device such as a resistor is provided in the first cavity 1 , the magnetic device 7 provided outside the second cavity 2 is of a different type from the magnetic device in the first cavity 1 .

[0063] The above-mentioned power conversion equipment realizes the external placement of the magnetic device 7 relative to the condenser 3, so that the volume of the second cavity 2 is smaller, which facilitates the installation, disassembly and maintenance of the second cavity 2; the magnetic device 7 and the condenser 3 are not in the same cavity, so that the magnetic device 7 can be cooled separately, which can improve the cooling effect of the magnetic device 7, and can also avoid the mutual interference between the cooling of the magnetic device 7 and the cooling of the condenser 3, so that the condenser 3 and the magnetic device 7 can obtain better cooling effect; at the same time, the magnetic device 7 can be ignored in the process of designing and installing the condenser 3, and the condenser 3 can be ignored in the process of designing and installing the magnetic device 7, which can improve the flexibility of the structural layout of the power conversion equipment.

[0064] To facilitate airflow through the condenser 3, the power conversion device further includes a first fan 5 for driving air through the condenser 3. The type, number, and distribution of the first fans 5 are selected based on actual conditions and are not limited in this embodiment.

[0065] It should be noted that, if the heat dissipation of the condenser 3 meets the requirements, the first fan 5 may not be provided.

[0066] In the above power conversion device, the distribution of the evaporators 4 is selected according to actual conditions.

[0067] On the one hand, as shown in FIG. 1 to FIG. 8 , the evaporator 4 may be located in the second cavity 2 .

[0068] On the other hand, as shown in Figures 9 and 10, the evaporator 4 can be located in the first cavity 1. In this way, the evaporator 4 is placed outside the condenser 3, preventing the hot air in the second cavity 2 from affecting the evaporator 4, making the temperature of the evaporator 4 relatively lower, thereby achieving a better heat dissipation effect of the evaporator 4.

[0069] In the above power conversion device, the distribution of the magnetic device 7 is selected according to actual conditions. In some embodiments, the magnetic device 7 can be selected to be located outside the first cavity 1.

[0070] In the above structure, the air flowing through the condenser 3 can be selected to flow toward the magnetic device 7. Specifically, the magnetic device 7 and the second cavity air outlet 202 are opposite each other, so that the airflow discharged from the second cavity air outlet 202 dissipates heat from the magnetic device 7. Of course, it is also possible to select that the air flows through the magnetic device 7 before flowing through the condenser 3. Specifically, the magnetic device 7 and the second cavity air inlet 201 are opposite each other, so that the airflow dissipates heat from the magnetic device 7 before entering the second cavity air inlet 201.

[0071] Since the magnetic device 7 has a higher temperature resistance than the condenser 3 , the magnetic device 7 and the second cavity air outlet 202 may be positioned opposite to each other.

[0072] In addition to the above heat dissipation method, the magnetic device 7 may also adopt other heat dissipation methods and is not limited to the above heat dissipation method.

[0073] When the magnetic device 7 is located outside the first cavity 1 and the second cavity 2, the magnetic device 7 can be exposed, as shown in Figures 1-4 and 9; or a third cavity 8 can be provided to accommodate the magnetic device 7, as shown in Figures 5-8.

[0074] In some other embodiments, as shown in FIG. 5 to FIG. 8 , the power conversion device further includes a third cavity 8 , the magnetic device 7 is located in the third cavity 8 , and the third cavity 8 can allow air to flow through the magnetic device 7 to cool the magnetic device 7 .

[0075] The third cavity 8 has a third cavity air inlet 801 and a third cavity air outlet 802. The third cavity 8 can be connected to the external environment of the entire power conversion device, or it can be connected to other cavities in the power conversion device other than the first cavity 1 and the second cavity 2, as long as it can ensure cooling of the magnetic device 7.

[0076] In order to improve the cooling efficiency, the third cavity 8 may be selected as an open cavity, and the third cavity 8 is communicated with the external environment of the power conversion device.

[0077] In order to facilitate airflow through the magnetic device 7 , the power conversion device further includes a second fan 9 , which is used to drive air to flow through the magnetic device 7 .

[0078] The type, number, and distribution of the second fans 9 are selected according to actual conditions and are not limited in this embodiment.

[0079] It should be noted that, if the heat dissipation of the condenser meets the requirements, the second fan 9 may not be provided.

[0080] The flow of air in the third cavity 8 and the flow of air in the second cavity 2 can be correlated. For example, the third cavity 8 and the second cavity 2 are connected, or the third cavity 8 and the second cavity 2 share a fan 10. Of course, the flow of air in the third cavity 8 and the flow of air in the second cavity 2 can also be uncorrelated, which can be selected according to actual conditions.

[0081] The relative positional relationship among the third cavity 8 , the second cavity 2 and the first cavity 1 is selected according to actual conditions and is not limited in this embodiment.

[0082] In some other embodiments, the magnetic device 7 may be located in the first cavity 1 .

[0083] It should be noted that the magnetic device 7 is located inside the first cavity 1 , which is a case where the magnetic device 7 is located outside the second cavity 2 .

[0084] The above descriptions describe the arrangement of the evaporator 4 and the arrangement of the magnetic device 7 separately. In actual situations, the arrangement of the evaporator 4 and the arrangement of the magnetic device 7 can be combined.

[0085] Example 1

[0086] As shown in Figures 1 to 4, in the power conversion device provided in the first embodiment, the evaporator 4 is located in the second cavity 2, the magnetic device 7 is located outside the first cavity 1 and outside the second cavity 2, and the magnetic device 7 is exposed outside the first cavity 1 and outside the second cavity 2.

[0087] In the first embodiment, to facilitate the placement of the condenser 3 and the evaporator 4, the second cavity 2 may include a connected top cavity 203 and a side cavity 204, wherein the top cavity 203 is located at the top of the first cavity 1, the side cavity 204 is located at the side of the first cavity 1, the evaporator 4 is located in the side cavity 204, and the condenser 3 is located in the top cavity 203. This facilitates the condenser 3 being higher than the evaporator 4, and also facilitates the evaporator 4 to dissipate heat from the power device 6.

[0088] The side cavity 204 may be located at the back of the first cavity 1 . For example, the side cavity 204 is disposed outside the back plate 101 of the first cavity 1 .

[0089] In actual situations, the second cavity 2 may also be selected to have other structures, and is not limited to the above structure.

[0090] The second cavity air inlet 201 of the second cavity 2 can be set in the top cavity 203, and the second cavity air outlet 202 of the second cavity 2 can be set in the side cavity 204. Of course, the positions of the second cavity air inlet 201 and the second cavity air outlet 202 can also be swapped, which is not limited in this embodiment.

[0091] In the first embodiment, there are two ways to dissipate heat for the magnetic device 7. On the one hand, as shown in FIG1 , the magnetic device 7 is exposed outside the first cavity 1 and the second cavity 2 , and the magnetic device 7 can dissipate heat naturally.

[0092] 2-4 , under the action of the first fan 5, the air flowing through the condenser 3 flows toward the magnetic device 7. Specifically, the magnetic device 7 is opposite to the second cavity air outlet 202, so that the airflow discharged from the second cavity air outlet 202 dissipates heat for the magnetic device 7.

[0093] Of course, the magnetic device 7 and the second cavity air inlet 201 may also be arranged to be opposite to each other (see above for details), and the heat dissipation method is not limited to that shown in FIG. 2 to FIG. 4 .

[0094] It should be noted that the heat dissipation method shown in Figures 2 to 4 links the heat dissipation of the condenser 3 with the heat dissipation of the magnetic device 7. During the actual installation process, it is only necessary to ensure the relative position of the magnetic device 7 and the air outlet 202 of the second cavity, or the relative position of the magnetic device 7 and the air inlet 201 of the second cavity. Compared with the magnetic device 7 being arranged in the second cavity 2, the design flexibility and installation flexibility of the power conversion equipment are also improved to a certain extent.

[0095] In the first embodiment, as shown in Figures 1-3, a first fan 5 is provided to drive airflow through the condenser 3, that is, the first fan 5 drives airflow from the second cavity air inlet 201 to the second cavity air outlet 202. The first fan 5 is provided at the second cavity air inlet 201. Of course, the first fan 5 can also be provided at the second cavity air outlet 202.

[0096] As shown in FIG. 1 and FIG. 2 , the first fan 5 is located inside the second cavity 2 ; as shown in FIG. 3 , the first fan 5 is located outside the second cavity 2 .

[0097] In the structure shown in Figures 1 to 3, forced air cooling of the condenser 3 and the magnetic device 7 is achieved, thereby improving the heat dissipation effect; the condenser 3 and the magnetic device 7 also share the first fan 5, thereby simplifying the structure and reducing the cost.

[0098] As shown in FIG. 4 , the air may flow through the condenser 3 naturally, that is, the first fan 5 is not provided.

[0099] In the first embodiment, other structures of the power conversion device can be referred to above and will not be described again here.

[0100] Example 2

[0101] As shown in FIG. 5 to FIG. 8 , the power conversion device provided in the second embodiment differs from that in the first embodiment mainly in that the magnetic device 7 is disposed in the third cavity 8 .

[0102] It should be noted that, in the second embodiment, the evaporator 4 is located in the second cavity 2 .

[0103] In the second embodiment, as shown in FIG. 5 , the third cavity 8 may be disposed on the side of the first cavity 1 , for example, the third cavity 8 is disposed on the back plate 101 of the first cavity 1 .

[0104] In the case where the second cavity 2 includes the top cavity 203 and the side cavity 204 , the third cavity 8 may be selected to be located at the bottom end of the side cavity 204 .

[0105] The third cavity 8 has a third cavity air inlet 801 and a third cavity air outlet 802, so that air can flow through the magnetic device 7 to cool the magnetic device 7. The positions of the third cavity air inlet 801 and the third cavity air outlet 802 are selected according to actual conditions.

[0106] In the case where the third cavity 8 is located at the bottom of the side cavity 204, the second cavity air inlet 201 is located at the top cavity 203, and the second cavity air outlet 202 is located at the side cavity 204, the third cavity air inlet 801 can be located at the bottom of the third cavity 8, and the third cavity air outlet 802 can be located at the top of one side of the third cavity 8. In this way, the inlet and outlet of the second cavity 2 and the inlet and outlet of the third cavity 8 are prevented from affecting each other.

[0107] It should be noted that the second cavity air outlet 202 is not shown in FIG. 5 .

[0108] In actual situations, the third cavity air inlet 801 and the third cavity air outlet 802 may also be distributed elsewhere, which is not limited in this embodiment 2.

[0109] In the second embodiment, the second fan 9 may be provided or not provided, and the selection is made according to the heat dissipation requirement of the magnetic component 7 .

[0110] When the second fan 9 is provided, the second fan 9 is located inside the third cavity 8 or outside the third cavity 8 ; the second fan 9 is located at the air inlet 801 of the third cavity or at the air outlet 802 of the third cavity.

[0111] In the second embodiment, as shown in Figures 6 to 8, the third cavity 8 is located at the top of the first cavity 1. In actual situations, the third cavity 8 can also be set at other locations, which is not limited in the second embodiment.

[0112] Since both the second cavity 2 and the third cavity 8 require airflow, a shared fan 10 can be selected for the third cavity 8 and the second cavity 2. In this case, the fan 10 is located outside the second cavity 2 and also outside the third cavity 8; the first fan 5 and the second fan 9 mentioned above can both be referred to as the fan 10, and the first fan 5 and the second fan 9 mentioned above are the same fan.

[0113] The number of fans 10 can be one or more than two, depending on the actual situation.

[0114] In the second embodiment, the third cavity 8 and the second cavity 2 share the fan 10 , so that the number of fans 10 can be reduced, thereby simplifying the structure of the power conversion device and reducing the cost of the power conversion device.

[0115] In the case where the third cavity 8 and the second cavity 2 share the fan 10 , the third cavity 8 and the second cavity 2 may be arranged in parallel or in series.

[0116] When the third cavity 8 and the second cavity 2 are arranged in parallel, the third cavity air inlet 801 and the second cavity air inlet 201 can be located on the same side. For example, the fan 10 is arranged at the third cavity air inlet 801 and the second cavity air inlet 201. In this way, the air flowing through the fan 10 is divided into two parts, one part flowing through the second cavity 2 and the other part flowing through the third cavity 8.

[0117] In order to facilitate the third cavity air inlet 801 and the second cavity air inlet 201 to be located on the same side, when the second cavity 2 includes a top cavity 203 and a side cavity 204 and the second cavity air inlet 201 is arranged in the top cavity 203, the third cavity 8 is arranged at the top of the first cavity 1, that is, the third cavity 8 and the top cavity 203 are arranged in parallel.

[0118] Of course, the third cavity 8 may also be set at other locations, which is not limited in the second embodiment.

[0119] When the third cavity 8 and the second cavity 2 are arranged in series, the third cavity 8 is located downstream or upstream of the second cavity 2. In order to improve the cooling effect on the condenser 3, the third cavity 8 can be selected to be located downstream of the second cavity 2.

[0120] When the second cavity 2 includes a top cavity 203 and a side cavity 204, the second cavity air inlet 201 is arranged in the top cavity 203, and the second cavity air outlet 202 is arranged in the side cavity 204, if the third cavity 8 is located downstream of the second cavity 2, the third cavity 8 can be selected to be located on the side of the first cavity 1, and the third cavity 8 is located on one side or the bottom of the side cavity 204; if the third cavity 8 is located upstream of the second cavity 2, the third cavity 8 can be selected to be located at the top of the first cavity 1, and the third cavity 8 is located on one side of the top cavity 203.

[0121] Of course, the third cavity 8 may also be set at other locations, which is not limited in the second embodiment.

[0122] In the second embodiment, there may be one or more third cavities 8. When there are more than two third cavities 8, in order to improve the heat dissipation effect of the magnetic device 7, the third cavities 8 and the second cavity 2 may be arranged in parallel, that is, every two third cavities 8 are also arranged in parallel.

[0123] In the case where there are more than two third cavities 8, the third cavities 8 and the second cavities 2 may also be arranged in series, that is, every two third cavities 8 are also arranged in series.

[0124] In the case where there are more than two third cavities 8, it is also possible to choose to arrange at least one third cavity 8 and the second cavity 2 in parallel, or at least one third cavity 8 and the second cavity 2 in series.

[0125] In the case where there are more than two third cavities 8 and the third cavity 8 and the second cavity 2 are arranged in parallel, all the third cavities 8 can be selected to be distributed on at least two sides of the second cavity 2, which facilitates the parallel arrangement of the third cavity 8 and the second cavity 2. Of course, all the third cavities 8 can also be selected to be distributed on one side of the second cavity 2.

[0126] In the case where there are more than two third cavities 8 and the third cavity 8 and the second cavity 2 are arranged in series, all the third cavities 8 can be selected to be distributed on one side of the second cavity 2, which facilitates the serial arrangement of the third cavity 8 and the second cavity 2. Of course, all the third cavities 8 can also be selected to be distributed on at least two sides of the second cavity 2.

[0127] It should be noted that all the third cavities 8 are distributed on at least two sides of the second cavity 2. It can be selected that all the third cavities 8 are evenly distributed on both sides of the second cavity 2, all the third cavities 8 are not evenly distributed on both sides of the second cavity 2, or all the third cavities 8 are distributed on three sides of the second cavity 2, etc.

[0128] In the second embodiment, other structures of the power conversion device can be referred to above and will not be described again here.

[0129] Example 3

[0130] As shown in FIG. 9 and FIG. 10 , the power conversion device provided in the third embodiment differs from that provided in the first embodiment mainly in that the evaporator 4 is located in the first cavity 1 .

[0131] As shown in FIG9 , the evaporator 4 is in contact with the inner wall of the first cavity 1 ; or, as shown in FIG10 , there is a gap between the evaporator 4 and the inner wall of the first cavity 1 .

[0132] In the case where there is a gap between the evaporator 4 and the inner wall of the first cavity 1 , electronic devices may be disposed in the gap or may not be disposed in the gap, which is not limited in this embodiment.

[0133] In the third embodiment, the magnetic device 7 is exposed outside the first cavity 1 and the second cavity 2, and the magnetic device 7 can dissipate heat naturally. In this case, the second cavity 2 can be set on the top of the first cavity 1.

[0134] The magnetic device 7 can also be set at the second cavity air inlet 201, and the air flow flows through the magnetic device 7 before flowing through the condenser 3; or, the magnetic device 7 can also be set at the second cavity air outlet 202, and the air flow flows through the magnetic device 7 after flowing through the condenser 3.

[0135] In the third embodiment, the magnetic device 7 may also be disposed in the third cavity. For the distribution of the magnetic device 7 and the third cavity, please refer to the above text and will not be described in detail here.

[0136] In the third embodiment, other structures of the power conversion device can be referred to above and will not be described again here.

[0137] In the power conversion device provided in the embodiment of the present application, the combination of the arrangement of the evaporator 4 and the arrangement of the magnetic device 7 is not limited to the above three embodiments. Other combinations can also be selected according to actual conditions, and the embodiment of the present application does not limit this.

[0138] The power conversion device provided in the embodiment of the present application may be an inverter, an energy storage converter or others, and the embodiment of the present application does not limit this.

[0139] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present application. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A power conversion device, characterized in that, Comprising: A first cavity, a second cavity, and a radiator; Wherein, a power device is disposed in the first cavity; The radiator includes an evaporator and a condenser that forms a circulation flow path with the evaporator, and the evaporator is used to absorb the heat of the power device; The condenser is located in the second cavity, and the second cavity can supply air to flow through the condenser to cool the condenser; a magnetic device is disposed outside the second cavity.

2. The power conversion device according to claim 1, wherein, The evaporator is located in the second cavity.

3. The power conversion device according to claim 2, characterized in that, The second cavity includes a top cavity and a side cavity that are connected. Wherein, the top cavity is located at the top of the first cavity, the side cavity is located at the side of the first cavity, the evaporator is located in the side cavity, and the condenser is located in the top cavity.

4. The power conversion device according to claim 1, characterized in that, The evaporator is located in the first cavity.

5. The power conversion device according to claim 4, characterized in that, The evaporator is in contact with the inner wall of the first cavity, or there is a gap between the evaporator and the inner wall of the first cavity.

6. The power conversion device according to claim 1, characterized in that, It further includes a first fan for driving air to flow through the condenser.

7. The power conversion device according to any one of claims 1-6, characterized in that, The magnetic device is located outside the first cavity.

8. The power conversion device according to claim 7, wherein The second cavity has a second cavity air inlet and a second cavity air outlet; The magnetic device is opposite to the second cavity air inlet, so that the magnetic device is cooled before the air flow enters the second cavity air inlet; or, the magnetic device is opposite to the second cavity air outlet, so that the air flow discharged from the second cavity air outlet cools the magnetic device. It further includes a third cavity, the magnetic device is located in the third cavity, and the third cavity can supply air to flow through the magnetic device to cool the magnetic device.

9. The power conversion device according to any one of claims 1-6, characterized in that, It further includes a second fan for driving air to flow through the magnetic device.

10. The power conversion device according to claim 9, characterized in that, When the power conversion device further includes a first fan for driving air to flow through the condenser, the first fan is located outside the second cavity, and the second fan is located outside the third cavity; 11. The power conversion device according to claim 10, characterized in that, Wherein, the first fan and the second fan are the same fan, and the third cavity and the second cavity share the fan assembly. The third cavity and the second cavity are arranged in parallel or in series; 12. The power conversion device according to claim 11, wherein, And / or, there are at least two third cavities, and all the third cavities are distributed on at least two sides of the second cavity. The magnetic device is located in the first cavity.

13. The power conversion device according to any one of claims 1-6, characterized in that, ​

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