Photovoltaic inverter

Abstract

Disclosed in the present application is a photovoltaic inverter, comprising a housing having an inner cavity and a first circuit board located in the inner cavity. Components are provided on a front surface of the first circuit board; heat dissipation bases for dissipating heat of the components are provided on a back surface of the first circuit board; the components correspond to and are mutually connected to the heat dissipation bases. The photovoltaic inverter further comprises a plurality of first air deflectors; in the inner cavity, a first heat dissipation channel is defined by the first air deflectors and the back surface of the first circuit board, the heat dissipation bases being exposed to the first heat dissipation channel. The photovoltaic inverter further comprises a fan module arranged in the inner cavity. The fan module comprises a fan and has an air inlet or an air outlet. One of the air inlet and the air outlet leads to the first heat dissipation channel.

Description

Photovoltaic inverter Technical Field

[0001] This invention belongs to the field of power equipment, and specifically relates to a photovoltaic inverter. Background Technology

[0002] A photovoltaic inverter (or solar inverter) is an inverter that converts the variable DC voltage generated by photovoltaic (PV) solar panels into AC power at the mains frequency. This AC power can be fed back into commercial transmission systems or supplied to off-grid power grids.

[0003] As the power of photovoltaic (PV) inverters increases, the heat generated by the power devices on the circuit boards inside the inverter chassis also increases. Soldering heat sinks onto the circuit boards is a common heat dissipation method. Due to layout and space constraints, heat sinks are often located on the back of the circuit board (opposite to the components). Because the distance between the circuit board and the bottom or top of the chassis is small, the heat on the heat sink cannot be effectively dissipated through internal airflow, easily causing localized heat accumulation and affecting the lifespan of the PV inverter. Previously, thermally conductive silicone sheets were typically used to transfer heat to the chassis or heat sink. However, due to the scattered distribution of power devices and heat sinks, the use of silicone sheets is limited. Therefore, effectively solving the problem of heat accumulation on the circuit board is a pressing technical issue that needs to be addressed. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a photovoltaic inverter that can effectively prevent heat buildup on the internal circuit board, thereby improving the reliability of the photovoltaic inverter.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A photovoltaic inverter includes a housing with an inner cavity and a first circuit board located in the inner cavity. Components are disposed on the front side of the first circuit board, and a heat sink for dissipating heat from the components is disposed on the back side of the first circuit board. The components and the heat sink correspond to and are connected to each other. The photovoltaic inverter also includes a plurality of first wind deflectors. The inner cavity is divided into a first heat dissipation channel by the first wind deflectors and the back side of the first circuit board, and the heat sink is exposed in the first heat dissipation channel. The photovoltaic inverter also includes a fan module disposed in the inner cavity. The fan module includes a fan and has an air inlet or an air outlet. One of the air inlet and the air outlet communicates with the first heat dissipation channel.

[0007] In a preferred embodiment, the fan module further includes a base, the fan is located on the base, the air inlet side of the fan faces the inner cavity of the base, and the air outlet side of the fan faces the first heat dissipation channel.

[0008] In a preferred embodiment, the base is provided with the air inlet, which includes a first air inlet and a second air inlet, and the first heat dissipation channel is connected to the air intake side of the fan through the first air inlet.

[0009] In a preferred embodiment, the heat sink is a heat dissipation copper busbar, which is soldered to the back of the circuit board.

[0010] In a preferred embodiment, the first windshield is bonded to the bottom plate of the housing or the first circuit board; the first windshield is made of insulating soft material.

[0011] In a preferred embodiment, the photovoltaic inverter further includes a second circuit board, a support plate for supporting the second circuit board, and a plurality of second wind deflectors. Components are located on the front side of the second circuit board, and a heat sink for dissipating heat from the components is located on the back side of the second circuit board. The components and the heat sink correspond to and are connected to each other. The inner cavity is divided into a second heat dissipation channel by the second wind deflectors, the support plate, and the back side of the second circuit board. The heat sink is exposed in the second heat dissipation channel, and the second heat dissipation channel communicates with the second air inlet. The position of the second wind deflectors can be flexibly adjusted according to the layout of the heat sink.

[0012] In a more preferred embodiment, the second heat dissipation channel is connected to the air intake side of the fan via the second air inlet.

[0013] In a more preferred embodiment, the second air inlet is located above the first air inlet and the first air inlet and the second air inlet are connected, and the air outlet side of the fan is located between the first air inlet and the second air inlet.

[0014] In a preferred embodiment, the second windshield is bonded to the support plate or the second circuit board; the second windshield is made of insulating soft material.

[0015] In a preferred embodiment, a first sealing strip is provided between the first air inlet and the first wind deflector; a second sealing strip is provided between the second air inlet and the second wind deflector. The first and second sealing strips facilitate the absorption of more cold air.

[0016] The present invention adopts the above solution, which has the following advantages compared with the prior art:

[0017] The photovoltaic inverter of the present invention, when the fan module is started, draws in lower-temperature gas from inside the photovoltaic inverter through the air inlet of the fan module. The lower-temperature gas dissipates heat to the heat sink on the circuit board through the first heat dissipation channel, thereby stabilizing the temperature inside the photovoltaic inverter and avoiding local heat accumulation on the circuit board, thus improving the reliability of the photovoltaic inverter. Attached Figure Description

[0018] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 is a perspective view of a photovoltaic inverter according to an embodiment of the present invention;

[0020] Figure 2 is an internal schematic diagram of a photovoltaic inverter according to an embodiment of the present invention;

[0021] Figure 3 is a schematic diagram of a fan module according to an embodiment of the present invention;

[0022] Figure 4 is a schematic diagram of the first heat dissipation channel;

[0023] Figure 5 is a right view of a photovoltaic inverter according to an embodiment of the present invention;

[0024] Figure 6 is a front view of a photovoltaic inverter according to an embodiment of the present invention;

[0025] Figure 7 is a schematic diagram of the base.

[0026] in,

[0027] 100. Photovoltaic inverter; 101. Housing; 1011. Base plate; 102. First circuit board; 103. Second circuit board;

[0028] 200. Copper heat dissipation busbar;

[0029] 1. Fan module; 11. Base; 111. Hollowed-out section; 112. Side wall; 113. Top wall; 12. Fan; 121. Air outlet side; 13. First air inlet; 14. Second air inlet;

[0030] 2. Support plate; 3. First heat dissipation channel; 31. First wind deflector; 4. Second heat dissipation channel; 41. Second wind deflector; 5. First sealing strip; 51. Second sealing strip; 6. Support column. Detailed Implementation

[0031] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art. It should be noted that the description of these embodiments is for the purpose of aiding understanding the present invention, but does not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0032] Referring to Figures 1 to 7, this embodiment provides a photovoltaic inverter 100, including a housing 101, a first circuit board 102 located in the inner cavity of the housing 101, and a second circuit board 103. Here, the number of circuit boards is not limited, and can be set to one or more depending on the actual use. Specifically, in this embodiment, the number of circuit boards in the housing 101 is two, with the first circuit board 102 and the second circuit board 103 placed one above the other.

[0033] Furthermore, the photovoltaic inverter 100 also includes a fan module 1, a first heat dissipation channel 3, and a second heat dissipation channel 4 located in the inner cavity of the housing 101. The fan module 1 is fixed to the housing 101 by a plurality of fasteners. The fan module 1 includes a base 11 and a fan 12 located on the base 11. The fan 12 is fixed to the base 11 by a plurality of screws. More specifically, the base 11 is provided with a hollow portion 111. The fan 12 is fixed to the hollow portion 111 by a plurality of screws. The hollow portion 111 can be provided on the side wall 112 of the base 11 or on the top wall 113 of the base 11. Specifically, in this embodiment, the hollow portion 111 is provided on the side wall 112 of the base 11. In other embodiments, the hollow portion 111 can also be provided on other side walls or the top wall 113 of the base 11. The base 11 is made of insulating material or is wrapped with insulating material on the outside. The base 11 also has an inner cavity. The fan 12 has an air inlet side and an air outlet side 121. Further, the air inlet side of the fan 12 faces the inner cavity of the base 11 and the air inlet side of the fan is connected to the inner cavity. The air outlet side 121 of the fan 12 faces the first heat dissipation channel 3. Furthermore, the distance between the air inlet side of the fan 12 and the rear wall of the base 11 is greater than half the diameter of the circle formed by the fan blades of the fan 12, ensuring that the air resistance is small and there is a large air intake space. Here, the rear wall refers to the side opposite to the side wall where the fan is installed.

[0034] The first circuit board 102 has components on its front side and a heat sink on its back side for dissipating heat from the components. The components and the heat sink correspond to and are connected to each other. The second circuit board 103 has components on its front side and a heat sink on its back side for dissipating heat from the components. The components and the heat sink correspond to and are connected to each other. The photovoltaic inverter also includes multiple first wind deflectors 31, a support plate 2 for supporting the second circuit board 103, and multiple second wind deflectors 41. The inner cavity of the photovoltaic inverter is divided into a first heat dissipation channel 3 by the first wind deflectors 31 and the back side of the first circuit board 102, and the heat sink is exposed in the first heat dissipation channel 3. The inner cavity of the photovoltaic inverter is divided into a second heat dissipation channel 4 by the second wind deflectors 41, the support plate 2, and the back side of the second circuit board 103, and the heat sink is exposed in the second heat dissipation channel 4. The support plate 2 is connected to the housing 101 by multiple support columns 6.

[0035] Furthermore, the fan module 1 has an air inlet and an air outlet. The air outlet is the aforementioned air outlet side 121. Specifically, the air inlet is disposed on the base 11, and the base 11 has a first air inlet 13 and a second air inlet 14. The first air inlet 13 is connected to the first heat dissipation channel 3, and the second air inlet 14 is connected to the second heat dissipation channel 4. More specifically, the first heat dissipation channel 3 is connected to the air inlet side of the fan 12 through the first air inlet 13, and the second heat dissipation channel 4 is connected to the air inlet side of the fan 12 through the second air inlet 14. The second air inlet 14 is located above the first air inlet 13, and the first air inlet 13 and the second air inlet 14 are connected. The air outlet side 121 of the fan 12 is located between the first air inlet 13 and the second air inlet 14, and the fan 12 can simultaneously extract heat from the first heat dissipation channel 3 and the second heat dissipation channel 4. The cross-sectional area of ​​the first air inlet 13 and the second air inlet 14 is greater than or equal to the cross-sectional area of ​​the air outlet side of the fan 12, so that the fan 12 can draw in more cold air and reduce the air outlet resistance.

[0036] Specifically, the heat sinks on the first circuit board 102 and the second circuit board 103 are heat dissipation copper busbars 200. There are multiple heat dissipation copper busbars 200. Referring to FIG2, the shape or arrangement of the first wind deflector 31 and the second wind deflector 41 is mainly based on the distribution of the heat dissipation copper busbars. The heat dissipation effect can also be increased by increasing the opening area of ​​the first wind deflector 31 and the second wind deflector 41.

[0037] In this embodiment, the first windbreak 31 and the second windbreak 41 are made of insulating soft material and have adhesive backing on only one side. The thickness of the first windbreak 31 and the second windbreak 41 is 10-15mm. Referring to FIG2, the first windbreak 31 is compressed between the first circuit board 102 and the housing 101. Specifically, the housing 101 has a base plate 1011, and the first heat dissipation channel 3 is located between the first circuit board 101, the base plate 1011 and the first windbreak 31. The heat dissipation copper busbar 200 of the first circuit board 102 is located within the first heat dissipation channel 3. The first windbreak 31 is bonded to the base plate 1011 of the housing 101 or the first circuit board 102. The second windbreak 41 is compressed between the second circuit board 103 and the support plate 2, and the second windbreak 41 is bonded to the support plate 2 or the second circuit board 103. It should be noted that, for ease of disassembly, the first windshield 31 will not be simultaneously attached to the base plate 1011 and the first circuit board 102, and the second windshield 41 will not be simultaneously attached to the support plate 2 and the second circuit board 103.

[0038] Furthermore, a first sealing strip 5 is provided between the first air inlet 13 and the first baffle 31, and a second sealing strip 51 is provided between the second air inlet 14 and the second baffle 41. The first sealing strip 5 and the second sealing strip 51 can ensure sufficient air intake. There are two of each of the first baffle 31 and the second baffle 41. When it is necessary to dissipate heat from the heat sink on the circuit board, the fan 12 is turned on, and the cool air near the circuit board will pass through the first heat dissipation channel 3 and the second heat dissipation channel 4 to dissipate heat from the heat sink on the circuit board.

[0039] In existing technologies, cooling fans are typically installed near the circuit boards of photovoltaic inverters to dissipate heat. However, these fans primarily cool the front of the circuit board, offering little to no cooling for the back. This embodiment's photovoltaic inverter fan module draws heat away from the back of the circuit board to cool the copper heat sinks on the back, creating internal heat circulation. This evens out the heat within the inverter, preventing localized overheating and ensuring reliability. In other embodiments, multiple cooling fans can be installed inside the inverter to cool the front of the circuit board.

[0040] The photovoltaic inverter of this embodiment has at least the following advantages:

[0041] (1) By setting the first heat dissipation channel 3 and the second heat dissipation channel 4, the phenomenon of local heat accumulation on the back of the circuit board can be effectively avoided, thereby affecting the reliability of the photovoltaic inverter.

[0042] (2) It has high flexibility and can flexibly adjust the shape of the baffle according to the distribution of the heat dissipation copper busbar and components to adjust the layout of the first heat dissipation channel 3 or the second heat dissipation channel 4.

[0043] (3) The heat dissipation efficiency can be improved by increasing the opening area of ​​the first wind deflector 31 and / or the second wind deflector 41 or by increasing the length range of the first wind deflector 31 and / or the second wind deflector 41.

[0044] As indicated in this specification and claims, the terms "comprising" and "including" only indicate the inclusion of expressly identified steps and elements, and these steps and elements do not constitute an exclusive list; the method or apparatus may also include other steps or elements. The term "or" as used herein includes any combination of one or more of the associated listed items.

[0045] It should be noted that, unless otherwise specified, when a feature is referred to as "fixed" or "connected" to another feature, it can be directly fixed or connected to the other feature, or indirectly fixed or connected to the other feature. Furthermore, the descriptions of "up," "down," "left," and "right" used in this invention are only relative to the relative positional relationships of the various components of the invention in the accompanying drawings.

[0046] The above embodiments are merely illustrative of the technical concept and features of the present invention, and are preferred embodiments. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly, and they should not be construed as limiting the scope of protection of the present invention. All equivalent transformations or modifications made according to the principles of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A photovoltaic inverter, comprising a housing having an inner cavity and a first circuit board located within the inner cavity, wherein components are disposed on the front side of the first circuit board, and a heat sink for dissipating heat from the components is disposed on the back side of the first circuit board, wherein the components and the heat sink are corresponding to and interconnected, characterized in that, The photovoltaic inverter further includes a plurality of first wind deflectors, the inner cavity being separated into a first heat dissipation channel by the first wind deflectors and the back of the first circuit board, and the heat sink being exposed in the first heat dissipation channel; the photovoltaic inverter further includes a fan module disposed in the inner cavity, the fan module including a fan and having an air inlet or an air outlet, one of the air inlet and the air outlet being connected to the first heat dissipation channel.

2. The photovoltaic inverter according to claim 1, characterized in that, The fan module also includes a base, the fan is located on the base, the air inlet side of the fan faces the inner cavity of the base, and the air outlet side of the fan faces the first heat dissipation channel.

3. The photovoltaic inverter according to claim 2, characterized in that, The base is provided with the air inlet, which includes a first air inlet and a second air inlet. The first heat dissipation channel is connected to the air intake side of the fan through the first air inlet.

4. The photovoltaic inverter according to claim 3, characterized in that, The heat sink is a copper heat sink, which is soldered to the back of the first circuit board.

5. The photovoltaic inverter according to claim 4, characterized in that, The first windshield is bonded to the bottom plate of the housing or the first circuit board; the first windshield is made of insulating soft material.

6. The photovoltaic inverter according to claim 3, characterized in that, The photovoltaic inverter also includes a second circuit board, a support plate for supporting the second circuit board, and a plurality of second wind deflectors. The front of the second circuit board is provided with components, and the back of the second circuit board is provided with a heat sink for dissipating heat from the components. The components and the heat sink correspond to and are connected to each other. The inner cavity is divided into a second heat dissipation channel by the second wind deflector, the support plate, and the back of the second circuit board. The heat sink is exposed in the second heat dissipation channel, and the second heat dissipation channel is connected to the second air inlet.

7. The photovoltaic inverter according to claim 6, characterized in that, The second heat dissipation channel is connected to the air intake side of the fan through the second air inlet; the heat sink is a copper heat dissipation busbar, which is soldered to the back of the second circuit board.

8. The photovoltaic inverter according to claim 7, characterized in that, The second air inlet is located above the first air inlet and the first air inlet and the second air inlet are connected. The air outlet of the fan is located between the first air inlet and the second air inlet.

9. The photovoltaic inverter according to claim 7, characterized in that, The second windshield is bonded to the support plate or the second circuit board; the second windshield is made of insulating soft material.

10. The photovoltaic inverter according to claim 7, characterized in that, A first sealing strip is provided between the first air inlet and the first wind deflector; a second sealing strip is provided between the second air inlet and the second wind deflector.

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