CN220554223U

CN220554223U - Photovoltaic inverter and photovoltaic power generation system

Info

Publication number: CN220554223U
Application number: CN202321588598.1U
Authority: CN
Inventors: 郝裕伟; 李霁阳; 李泉明
Original assignee: Huawei Digital Power Technologies Co Ltd
Current assignee: Huawei Digital Power Technologies Co Ltd
Priority date: 2023-06-20
Filing date: 2023-06-20
Publication date: 2024-03-01
Anticipated expiration: 2033-06-20

Abstract

The embodiment of the application provides a photovoltaic inverter and a photovoltaic power generation system. The photovoltaic inverter comprises an inverter shell, a circuit board, a power module, a radiator and a heat exchanger, wherein the circuit board is used for fixing the power module, the power module is used for packaging at least one power tube, and the radiator is used for radiating heat for the power module. The inverter housing includes a recessed structure for receiving the circuit board, the power module, and the heat sink. The heat exchanger is used for closing the groove structure, the groove bottom of the groove structure and the heat exchanger are oppositely arranged along the first direction, and the circuit board is arranged between the groove bottom of the groove structure and the heat exchanger. The photovoltaic inverter can radiate heat generated by the power module through the radiator, and can radiate heat transmitted to the radiator through the heat exchanger, so that the radiating effect of the photovoltaic inverter is improved. Furthermore, the heat exchanger can act as a part of the entire housing of the photovoltaic inverter, reducing the cost of the photovoltaic inverter. And further reduces the cost of the photovoltaic power generation system.

Description

Photovoltaic inverter and photovoltaic power generation system

Technical Field

The embodiment of the application relates to the technical field of photovoltaics, in particular to a photovoltaic inverter and a photovoltaic power generation system.

Background

In a photovoltaic power generation system, a photovoltaic inverter may convert input direct current into alternating current. Wherein direct current is also called direct current, or simply DC. Alternating current is also known as alternating current, or AC for short. In general, a photovoltaic inverter is provided with a power tube, and the output power of the power tube is relatively large, so that the heat generation of the power tube is large. In the prior art, in order to solve the heat dissipation problem of a power tube in a photovoltaic inverter, a radiator is arranged in a shell of the photovoltaic inverter. However, as the heat dissipation density of photovoltaic inverters increases, the heat dissipation capability of photovoltaic inverters tends to be a bottleneck.

Disclosure of Invention

The embodiment of the application provides a photovoltaic inverter and a photovoltaic power generation system. The photovoltaic inverter dissipates heat to the power tube through the radiator and dissipates heat to the outside through the heat exchanger, so that the heat dissipation effect of the photovoltaic inverter is improved, and the cost of the photovoltaic power generation system is reduced.

In a first aspect, embodiments of the present application provide a photovoltaic inverter including an inverter housing, a circuit board, a power module, a heat sink, and a heat exchanger. The circuit board is used for fixing the power module, the power module is used for packaging at least one power tube, the radiator is used for radiating for the power module, the inverter shell comprises a groove structure, and the groove structure is used for accommodating the circuit board, the power module and the radiator. The heat exchangers are used for closing the groove structures, the groove bottoms of the groove structures and the heat exchangers are arranged oppositely along the first direction, and the circuit board is arranged between the groove bottoms of the groove structures and the heat exchangers.

The photovoltaic inverter provided by the embodiment of the application not only can radiate heat generated by the power module through the radiator, but also can radiate heat to the outside through the heat of the radiator transferred by the power tube through the heat exchanger, so that the radiating effect of the photovoltaic inverter is improved. In addition, through enclosing the groove structure of heat exchanger and inverter casing and forming the whole casing of photovoltaic inverter for the heat exchanger can act as the part of the whole casing of photovoltaic inverter, has reduced the cost of photovoltaic inverter. And further reduces the cost of the photovoltaic power generation system.

In one implementation, the heat exchanger includes two flow guide grooves, which are oppositely arranged between walls of the groove structure along a second direction, and the second direction is perpendicular to the first direction. The two diversion trenches are respectively used for enclosing the groove walls of the groove structure to form two diversion cavities, and the two diversion cavities are oppositely arranged along the second direction. Correspondingly, the air flow carrying heat in the groove structure of the photovoltaic inverter flows into the heat exchanger through one flow guide cavity, the heat exchanger dissipates the heat in the air flow to the outside, and then the air flow flows back into the groove structure of the photovoltaic inverter through the other flow guide cavity, so that the air flow in the photovoltaic inverter can flow circularly. In the process of circulating airflow, the wall of the diversion trench and the wall of the heat exchanger can reduce the temperature of the airflow, and the heat dissipation effect of the photovoltaic inverter is improved.

In one implementation, the heat exchanger further comprises a heat exchange substrate, the heat exchange substrate comprises a heat dissipation cavity, the heat dissipation cavity penetrates through the heat exchange substrate along the second direction, the heat dissipation cavity is arranged between the two flow guide cavities along the second direction, and the heat dissipation cavity is communicated with the groove structure through the two flow guide cavities. Correspondingly, the air flow carrying heat in the groove structure of the photovoltaic inverter flows into the heat dissipation cavity of the heat exchanger through one flow guide cavity, the air flow carrying heat dissipates the heat in the air flow to the outside in the process of flowing in the heat dissipation cavity of the heat exchanger, and then the air flow flows back into the groove structure of the photovoltaic inverter through the other flow guide cavity, so that the air flow in the photovoltaic inverter can circularly flow along the flow guide cavity, the heat dissipation cavity and the other flow guide cavity, and in the process of circularly flowing the air flow, the temperature of the air flow can be reduced by the wall of the flow guide groove and the wall of the heat dissipation cavity, and the heat dissipation effect of the photovoltaic inverter is improved.

In one implementation, the dimension of the flow guide groove along the first direction is greater than the dimension of the heat exchange substrate along the first direction. Correspondingly, the diversion trench can guide more airflow into the heat exchanger, so that the radiating process of the photovoltaic inverter is accelerated.

In one implementation, the heat exchanger further includes a flow post including an internal flow channel for communicating the two flow directing cavities, the projections of the two flow directing cavities along the first direction covering the projections of the internal flow channel inlet and the projections of the internal flow channel outlet, respectively. Correspondingly, the air flow carrying heat in the groove structure of the photovoltaic inverter flows into the inner flow passage of the flow guide column of the heat exchanger through one flow guide cavity, the air flow carrying heat dissipates the heat in the air flow to the outside in the flowing process of the inner flow passage of the flow guide column, and then the air flow flows back to the groove structure of the photovoltaic inverter through the other flow guide cavity, so that the air flow in the photovoltaic inverter can circularly flow along the inner flow passage of the flow guide cavity, the inner flow passage of the flow guide column and the other flow guide cavity, and in the circulating flowing process of the air flow, the wall of the flow guide groove and the wall of the flow guide column can reduce the temperature of the air flow, and the heat dissipation effect of the photovoltaic inverter is improved.

In one implementation, the bottom of each of the two flow guide grooves includes a through hole that penetrates the bottom of each flow guide groove along a first direction, and the bottoms of the groove structures and the bottoms of each flow guide groove are arranged along the first direction. The inner flow channel is communicated with the diversion cavity through a through hole at the bottom of each diversion trench. Correspondingly, the air flow carrying heat in the groove structure of the photovoltaic inverter flows into the inner flow passage of the flow guide column of the heat exchanger through the through hole at the bottom of the flow guide groove, the air flow carrying heat dissipates heat in the air flow to the outside in the flowing process of the inner flow passage of the flow guide column, and then the air flow flows back to the groove structure of the photovoltaic inverter through the through hole at the bottom of the other flow guide groove, so that the air flow in the photovoltaic inverter can circularly flow along the through hole at the bottom of one flow guide groove, the inner flow passage of the flow guide column and the through hole at the bottom of the other flow guide groove, and the wall of the flow guide groove and the wall of the flow guide column can reduce the temperature of the air flow in the circulating flowing process of the air flow, and the heat dissipation effect of the photovoltaic inverter is improved.

In one implementation, one of the two channels includes a channel bottom and two channel walls. Wherein, two cell walls of a guiding gutter are arranged relatively along the third direction, and the third direction is perpendicular to the first direction, the second direction, and along the first direction, the tank bottom of the groove structure, the tank bottom of a guiding gutter are arranged relatively. The groove bottom of one diversion groove is fixedly connected with two groove walls of one diversion groove, and the two groove walls of one diversion groove are positioned between the groove bottom of one diversion groove and the groove bottom of the groove structure along the first direction. Correspondingly, the air flow carrying heat in the groove structure of the photovoltaic inverter flows into the flow guiding cavity along the two groove walls of one flow guiding groove and flows into the heat exchanger, the heat exchanger dissipates the heat in the air flow to the outside, and then the air flow flows back into the groove structure of the photovoltaic inverter along the two groove walls of the other flow guiding groove. In the process of circulating airflow, the two groove walls of the diversion groove can reduce the temperature of the airflow, and the heat dissipation effect of the photovoltaic inverter is improved.

In one implementation, along the first direction, the radiator overlaps a projected portion of one of the two flow channels, and the radiator does not overlap a projected portion of the other of the two flow channels. Accordingly, the process of heat emitted by the radiator flowing into the diversion trench is quickened.

In one implementation, one of the two channels further includes another channel wall. The other groove wall of one diversion trench is positioned between the two groove walls of the one diversion trench and the other diversion trench in the two diversion trenches along the second direction, and the other groove wall of the one diversion trench is provided with a through hole penetrating along the second direction. Correspondingly, the air flow carrying heat in the groove structure of the photovoltaic inverter can directly flow into one diversion cavity through the through hole on the other groove wall and flow into the heat exchanger, the heat exchanger dissipates the heat in the air flow to the outside, and then the air flow flows into the other diversion cavity along the two groove walls of the other diversion groove and directly flows back into the groove structure of the photovoltaic inverter through the through hole on the other groove wall of the other diversion groove. The circulating flow rate of the airflow in the photovoltaic inverter is accelerated.

In one implementation, the heat sink overlaps the projected portion of the through hole in the second direction. That is, in the second direction, the flow guiding groove is located above the radiator, and the air flow in the groove structure can flow into the flow guiding groove through the through hole. Like this, can guarantee that the air current in the groove structure gets into the guiding gutter fast, can also reduce photovoltaic inverter's volume.

In one implementation, the photovoltaic inverter includes a fan, and the groove structure is further configured to receive the fan. Wherein, the fan is fixedly connected with one of the two diversion trenches. Or the fan is fixedly connected with the groove wall of the groove structure, and along the first direction, the projection part of the fan and one of the two diversion trenches is overlapped, and the projection of the fan and the other diversion trench is not overlapped. Correspondingly, a fan is arranged in the groove structure, and the fan can cool and dissipate heat of devices in the groove structure. In addition, the fan is arranged near the diversion trench, so that the fan can quickly circulate the cold air flow from the heat exchanger into the groove structure. Furthermore, the heat dissipation process of the photovoltaic inverter is quickened.

In one implementation, a heat exchanger includes a heat exchange substrate and a heat exchange plate pack, each heat exchange plate pack including a plurality of heat exchange plates. The circuit board and the heat exchange plates are respectively arranged on two sides of the heat exchange substrate along the first direction, and the power module and the radiator are arranged between the circuit board and the heat exchange substrate. Correspondingly, the heat of the airflow entering the heat exchanger is radiated to the outside through the heat exchange substrate and the heat exchange fins in sequence, so that the radiating process of the photovoltaic inverter is accelerated.

In one implementation, the heat exchange substrate includes a heat dissipation cavity extending through the heat exchange substrate along the second direction, the heat dissipation cavity being configured to communicate with the groove structure. Correspondingly, the air flow carrying heat in the groove structure of the photovoltaic inverter flows into the heat dissipation cavity, the wall of the heat dissipation cavity, namely the heat exchange substrate, can reduce the temperature of the air flow, and the air flow after heat dissipation flows back into the groove structure from the heat dissipation cavity and continuously carries the heat in the groove structure to flow into the heat dissipation cavity. Therefore, through the circulation flow of the air flow, the heat dissipation of the photovoltaic inverter is realized, and the heat dissipation effect of the photovoltaic inverter is improved.

In one implementation, the heat exchange substrate includes four substrates. Two substrates of the four substrates are oppositely arranged along the first direction, the other two substrates are oppositely arranged along the third direction, and gaps of the four substrates form a heat dissipation cavity. Correspondingly, the air flow carrying heat in the groove structure of the photovoltaic inverter flows into the heat dissipation cavity, can flow back to the groove structure along the gaps of the four substrates extending along the second direction, and continuously carries the heat in the groove structure to flow into the heat dissipation cavity. In this way, in the circulation process of the air flow, the inner walls of the four substrates can reduce the temperature of the air flow, and the heat dissipation effect of the photovoltaic inverter is improved.

In one implementation, the heat exchange plate group comprises a first heat exchange plate group, wherein a plurality of heat exchange plates of the first heat exchange plate group are respectively fixed on the side surface of the heat exchange substrate, which is away from the groove structure, and the plurality of heat exchange plates of the first heat exchange plate group are arranged at intervals along a third direction or a second direction, and the third direction is perpendicular to the first direction and the second direction. Correspondingly, the heat exchanger radiates the heat transferred to the heat exchanger to the outside of the accommodating cavity formed by the groove structure and the heat exchanger through the plurality of heat exchange fins on the heat exchange substrate, so that the heat radiation of the photovoltaic inverter is realized, and the heat radiation effect of the photovoltaic inverter is improved.

In one implementation, the heat exchange plate group comprises a second heat exchange plate group, the second heat exchange plate group comprises a flow guide column, a plurality of heat exchange plates of the second heat exchange plate group are respectively and fixedly connected with the flow guide column, and the plurality of heat exchange plates of the second heat exchange plate group are arranged at intervals along the first direction or the third direction. Correspondingly, the air flow entering the flow guide column is radiated to the outside through the plurality of heat exchange fins of the second heat exchange fin group, so that the radiating process of the photovoltaic inverter is accelerated.

In one implementation, the plate pack includes two second plate packs spaced apart along the third direction. The flow guide columns of one second heat exchange plate group are arranged with the heat conduction columns of the other second heat exchange plate group at intervals along the third direction, and a plurality of heat exchange plates are respectively fixed on two sides of the flow guide column of each second heat exchange plate group. Correspondingly, the air flow entering the flow guiding column is radiated to the outside through the plurality of heat exchanging fins of the second heat exchanging fin groups at the two sides of the flow guiding column, so that the radiating area is increased, and the radiating process of the photovoltaic inverter is accelerated.

In one implementation, the photovoltaic inverter includes a fan, the inverter housing includes two side plates, the two side plates of the inverter housing respectively form part of a groove wall of the groove structure, wherein, along the second direction, the two side plates of the inverter housing are arranged relatively, the fan is arranged between the two side plates, a space between the fan and one side plate of the two side plates of the inverter housing is larger than a space between the fan and the other side plate, and a space between the fan and one side plate of the two side plates of the inverter housing is larger than a space between the radiator and the one side plate.

A fan is arranged in the groove structure, and can cool and dissipate heat of devices in the groove structure. In addition, the fan is arranged farther from one side plate than the radiator, and under the action of the fan, the air flow in the groove structure can flow from bottom to top. When the air flow in the groove structure flows from bottom to top, heat dissipated by the radiator can be taken away, and the heat is dissipated to the outside through the heat exchanger. Furthermore, the heat dissipation process of the photovoltaic inverter is quickened.

In one implementation, the heat sink includes a heat dissipating substrate and a plurality of heat dissipating fins, the heat dissipating substrate is fixedly connected to at least one of the power module or the circuit board, and the heat dissipating substrate includes two opposite sides. At least one of the two side surfaces of the heat dissipation substrate is used for conducting heat to contact with the power module, and one or more of the two side surfaces of the heat dissipation substrate is used for fixedly connecting with a plurality of heat dissipation fins. Correspondingly, heat generated by the power module is firstly transferred to the heat-radiating substrate through at least one side surface of the heat-radiating substrate, and the heat is radiated into the groove structure through the heat-radiating fins arranged on one or more side surfaces of the two side surfaces by the heat-radiating substrate, so that the heat radiation effect of the power module is accelerated.

In one implementation, the heat dissipating substrate and the circuit board are stacked and arranged along a first direction, the power module is arranged between the circuit board and the heat dissipating substrate, and two side surfaces of the heat dissipating substrate are oppositely arranged along the first direction. The power module is in heat conduction connection with one side surface of the heat dissipation substrate, and the plurality of heat dissipation fins are arranged on the other side surface of the heat dissipation substrate at intervals along the second direction or the third direction. Correspondingly, heat generated by the power module is firstly transferred to the heat-radiating substrate through one side surface of the heat-radiating substrate, and the heat is radiated into the groove structure through the heat-radiating fins arranged on the other side surface of the heat-radiating substrate, so that the heat radiation effect of the power module is accelerated.

In one implementation, the heat dissipating substrate is arranged adjacent to the power module along the second direction or the third direction. The power module is in heat conduction connection with one side face of the heat dissipation substrate, and the plurality of heat dissipation fins are respectively fixed on one side face of the heat dissipation substrate and the other side face of the heat dissipation substrate, and the number of the heat dissipation fins fixed on the other side face of the heat dissipation substrate is greater than that of the heat dissipation fins fixed on the one side face. Correspondingly, the power module transfers heat generated by the power module to the heat-radiating substrate through the side face of the heat-radiating substrate, the heat-radiating substrate dissipates heat to the groove structure through the heat-radiating fins on the two sides, the heat-radiating area of the radiator is large, and the heat-radiating process of the photovoltaic inverter is accelerated.

In a second aspect, there is provided a photovoltaic power generation system comprising a photovoltaic module for converting light energy into electrical energy and a photovoltaic inverter as described in any of the first aspect and possible implementations of the first aspect for converting direct current from the photovoltaic module into alternating current.

The technical effects of the second aspect may be referred to the corresponding descriptions in the foregoing aspects, and are not repeated here.

Drawings

Fig. 1 is a schematic diagram of a photovoltaic power generation system provided in an embodiment of the present application.

Fig. 2 is an exploded schematic view of an example of a photovoltaic inverter according to an embodiment of the present disclosure.

Fig. 3 is an assembled schematic view of the photovoltaic inverter shown in fig. 2.

Fig. 4 is an exploded schematic view of another example of a photovoltaic inverter according to an embodiment of the present disclosure.

Fig. 5 is an assembled schematic view of the photovoltaic inverter shown in fig. 4.

Fig. 6 is an exploded schematic view of another example of a photovoltaic inverter according to an embodiment of the present disclosure.

Fig. 7 is an assembled schematic view of the photovoltaic inverter shown in fig. 6.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

In the description of the embodiments of the present application, unless otherwise indicated, "/" means or, for example, a/B may represent a or B; "and/or" herein is merely an association relationship describing an association object, and means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone.

In the embodiment of the present application, prefix words such as "first", "second" and "third" are used merely to distinguish different description objects, and there is no limitation on the location, order, priority, number or content of the described objects. The use of ordinal words and the like in the embodiments of the present application to distinguish between the prefix words describing the object does not impose limitations on the described object, and statements of the described object are to be read in light of the claims or the description of the context of the embodiments and should not be construed as unnecessary limitations due to the use of such prefix words. In addition, in the description of the present embodiment, unless otherwise specified, the meaning of "a plurality" is two or more.

The terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," and the like in the embodiments of the present application are directional or positional relationships based on those shown in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

Reference in the specification to "some embodiments" or the like means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the application. Thus, appearances of the phrases "in some embodiments" or the like in various places throughout this specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments" unless expressly specified otherwise. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless expressly specified otherwise.

The term "vertical" referred to in this application is not strictly vertical but is within the tolerance of the error. "parallel" is not strictly parallel but is within the tolerance of the error.

In the embodiments of the present application, the same reference numerals denote the same components or the same parts. In the embodiment of the present application, for a plurality of identical components, reference numerals may be given to only one of the components in the drawings. The same reference numerals are used for other identical parts or components. In addition, the dimensions and sizes of the components shown in the drawings are merely exemplary.

The embodiment of the application provides a photovoltaic inverter and a photovoltaic power generation system, wherein the photovoltaic inverter comprises an inverter shell, a circuit board, a power module, a radiator and a heat exchanger. The circuit board is used for fixing the power module, the power module is used for packaging at least one power tube, the radiator is used for radiating for the power module, the inverter shell comprises a groove structure, and the groove structure is used for accommodating the circuit board, the power module and the radiator. The heat exchanger is used for closing the groove structure, the groove bottom of the groove structure and the heat exchanger are oppositely arranged along the first direction, and the circuit board is arranged between the groove bottom of the groove structure and the heat exchanger.

The following describes in detail the photovoltaic power generation system provided in the embodiment of the present application with reference to fig. 1.

Fig. 1 is a schematic diagram of a photovoltaic power generation system provided in an embodiment of the present application. As shown in fig. 1, a photovoltaic power generation system 1 provided in an embodiment of the present application includes one or more photovoltaic modules 10, a photovoltaic inverter 20, a transformer 30, a three-phase ac power grid 40, a dc cable 50, a first ac cable 60, and a second ac cable 70. Wherein one or more photovoltaic modules 10 are connected to the photovoltaic inverter 20 through the direct current cable 50, the connection relationship of the photovoltaic modules 10 and the photovoltaic inverter 20 may be one-to-one connection. The photovoltaic inverter 20 converts the direct current into alternating current, and the alternating current side of the photovoltaic inverter 20 is connected to the transformer 30 through a first alternating current cable 60. The transformer 30 is connected to the three-phase ac power grid 40 by a second ac cable 70. Thus, the ac power output from the photovoltaic inverter 20 passes through the transformer 30 and flows into the three-phase ac power grid 40. The respective devices included in the photovoltaic power generation system 1 are described in detail below.

The photovoltaic power generation system is a power generation system which converts solar radiation energy into electric energy by utilizing the photovoltaic effect of semiconductor materials. The photovoltaic power generation system provided by the embodiment of the application can energize the electric vehicle. The electric vehicle comprises a pure electric vehicle, a hybrid electric vehicle, an extended range electric vehicle, a plug-in hybrid electric vehicle or a new energy vehicle and the like. Among them, the electric vehicle is also called pure electric vehicle/battery electric vehicle, or simply pure EV/battery EV. The hybrid vehicle is also referred to as hybrid electric vehicle, or simply HEV. Extended range electric vehicles are also known as range extended electric vehicle, or simply REEV. Plug-in hybrid vehicles are also known as plug-in hybrid electric vehicle, or PHEV for short. New energy vehicles are also known as new energy vehicle, or NEV for short.

The photovoltaic module 10 may also be referred to as a photovoltaic array, comprising a plurality of strings of photovoltaic groups. Among these, photovoltaics are also known as photovoltaics, or simply PV. Group strings are also called strings. Each photovoltaic string comprises a plurality of photovoltaic panels connected in series. Photovoltaic panels are used to convert light energy into electrical energy. The electrical energy generated by the photovoltaic panel is DC electricity. The voltage across the string of photovoltaic groups is equal to the sum of the voltages produced by the plurality of photovoltaic panels. The output power of the photovoltaic module may represent the electrical energy output per unit time of the photovoltaic module.

The photovoltaic inverter 20 is used to convert input DC to AC, i.e., DC-AC conversion. The photovoltaic inverter 20 may also be referred to as a DC-AC converter.

The transformer 30 may be used to voltage convert the alternating current to adjust the voltage value of the input alternating current voltage. It should be appreciated that the input and the input of the transformer 30 are both alternating current. The transformer 30 may boost the alternating current output by the one or more photovoltaic inverters 20.

In the photovoltaic power generation system 1, the area of each photovoltaic module 10 is generally fixed, and when the light intensity of the light is unchanged, the larger the included angle between the light irradiated on the photovoltaic module 10 and the plane in which the photovoltaic module 10 is located, that is, the smaller the incident angle of the light irradiated on the photovoltaic module 10, the more electric energy is output by the photovoltaic module 10. When the light vertically irradiates on the photovoltaic module 10, that is, the included angle between the light and the plane where the photovoltaic module 10 is located is 90 degrees, and reaches the maximum value, the power output by the photovoltaic module 10 reaches the maximum value.

When the photovoltaic power generation system 1 includes a plurality of photovoltaic modules 10, the photovoltaic power generation system 1 further includes a junction box for junction the direct currents generated by the plurality of photovoltaic modules 10 and inputting the junction output to the photovoltaic inverter 20.

Next, a specific structure of the photovoltaic inverter 20 provided in the embodiment of the present application will be described in detail with reference to fig. 2 to 7.

Fig. 2 and 3 are an exploded schematic view and an assembled schematic view of an example of a photovoltaic inverter 20 according to an embodiment of the present application. Fig. 4 and 5 are an exploded view and an assembled view of another example of the photovoltaic inverter 20 according to the embodiment of the present application. Fig. 6 and 7 are an exploded view and an assembled view of a photovoltaic inverter 20 according to another embodiment of the present disclosure.

As shown in fig. 2 to 7, the photovoltaic inverter 20 includes an inverter case 210 and a heat exchanger 220. The inverter housing 210 includes a recess structure for accommodating the printed circuit board 250, the power module, the heat dissipation module, and the like. For example, the power module includes power tubes 230, 231 described below. The heat dissipation module includes a heat sink 240 and a fan 260 described below. Thus, after the heat exchanger 220 closes the groove structure, the groove bottoms of the groove structure and the heat exchangers are arranged relatively along the first direction, and the printed circuit board 250, the power module, the heat dissipation module and the like are arranged between the groove bottoms of the groove structure and the heat exchangers.

As shown in fig. 2 to 7, the inverter case 210 includes a first side plate 211, a top plate 212, a bottom plate 213, a first front plate 214, and a first rear plate 215. Wherein the first side plate 211 and the heat exchanger 220 are arranged opposite to each other along the first direction. The top plate 212 and the bottom plate 213 are arranged opposite to each other in the second direction. The first front plate 214 and the first rear plate 215 are arranged opposite to each other in the third direction. The first direction, the second direction and the third direction are perpendicular to each other. Thus, the first side plate 211 is a groove bottom of the groove structure of the inverter case 210, and the top plate 212, the bottom plate 213, the first front plate 214, and the first rear plate 215 are groove walls of the groove structure of the inverter case 210.

The structure of the device within the recess structure will be described in more detail with reference to fig. 2 to 7.

The photovoltaic inverter 20 includes a power module for encapsulating at least one power tube. For example, as shown in fig. 2 and 3, the power module includes a power tube 230. As another example, as shown in fig. 4 to 7, the power module includes a power tube 230 and a power tube 231.

Exemplary power transistors according to embodiments of the present application include, but are not limited to, power semiconductor devices, devices with heat dissipation, and the like. For example, the power transistor 230 is an insulated gate bipolar transistor or a power inductor. The insulated gate bipolar transistor is also called insulated gate bipolar transistor, or IGBT for short.

As shown in fig. 2 to 7, the photovoltaic inverter 20 includes a heat sink 240, and the heat sink 240 is used for dissipating heat from the power tube 230. In this way, the photovoltaic inverter 20 radiates heat to the power tube 230 through the radiator 240 and radiates heat to the outside through the heat exchanger 220, so that the radiating effect of the photovoltaic inverter 20 is improved and the cost of the photovoltaic power generation system 1 is reduced.

In some embodiments, the heat sink 240 is a relieved tooth heat sink. The position and specific structure of the heat sink 240 will be described in detail with reference to fig. 3 to 7.

In one embodiment, as shown in fig. 3, a heat sink 240 is arranged between the power tube 230 and the heat exchanger 220. Specifically, the heat sink 240 includes a heat dissipation substrate 241 and a plurality of heat dissipation fins 242, and the heat dissipation substrate 241 is fixedly connected to the power tube 230. In addition, the heat dissipation substrate 241 is arranged between the power tube 230 and the plurality of heat dissipation fins 242 along the first direction, and the plurality of heat dissipation fins 242 are arranged along the third direction or the second direction. In this way, the air flow in the inverter case 210 can flow from below the heat sink 240 to above the heat sink 240 through the gap between the adjacent two heat dissipation fins 242 in the bottom-up flow process, and dissipate heat to the outside through the heat exchanger 220. Further, the heat dissipation process of the photovoltaic inverter 20 is quickened.

In this embodiment, as shown in fig. 3, the power tube 230 is disposed laterally along the first direction, that is, the projected area of the power tube 230 along the first direction is larger than the projected area of the power tube 230 along the second direction and the projected area of the power tube 230 along the third direction. In addition, the power tube 230 and the heat sink 240 are disposed along the first direction such that the power tube 230 can transfer heat to the heat sink 240 to the maximum extent. Further, along the first direction, the projection of the power tube 230 is located in the projection of the heat dissipation substrate 241, so that the heat dissipation area of the heat sink 240 can be ensured to be maximum.

In one embodiment, the heat sink 240 is arranged between the power tube 230 and the first front plate 214. Specifically, the heat sink 240 includes a heat dissipation substrate 241 and a plurality of heat dissipation fins 242. In addition, the heat dissipation substrate 241 is arranged between the power tube 230 and the plurality of heat dissipation fins 242 along the third direction, and the plurality of heat dissipation fins 242 are arranged along the third direction or the second direction. In this way, the air flow in the inverter case 210 can flow from below the heat sink 240 to above the heat sink 240 through the gap between the adjacent two heat dissipation fins 242 in the bottom-up flow process, and dissipate heat to the outside through the heat exchanger 220. Further, the heat dissipation process of the photovoltaic inverter 20 is quickened.

In this embodiment, the power tube 230 is disposed laterally along the third direction, that is, the projected area of the power tube 230 along the third direction is larger than the projected area of the power tube 230 along the first direction and the projected area of the power tube 230 along the second direction. In addition, the power tube 230 and the heat sink 240 are disposed along the third direction, so that the power tube 230 can transfer heat to the heat sink 240 to the maximum extent. Further, along the third direction, the projection of the power tube 230 is located in the projection of the heat dissipation substrate 241, so that the heat dissipation area of the heat sink 240 can be ensured to be maximum.

In some embodiments, to increase the heat dissipation area of the heat sink 240 and speed up the heat dissipation process of the heat sink 240 from the power tube 230 into the inverter housing 210, the heat sink 240 may be an "F" shaped heat sink. The structure of the "F" shaped heat sink 240 provided in the embodiment of the present application will be described in detail with reference to fig. 5 and 7.

As shown in fig. 5 and 7, the heat sink 240 includes a heat dissipation substrate 241, a plurality of first sub heat dissipation fins 243, and a plurality of second sub heat dissipation fins 244. The heat dissipation substrate 241 is fixedly connected to the printed circuit board 250.

In one embodiment, as shown in fig. 5 and 7, the heat dissipation substrate 241 is disposed between the plurality of first sub heat dissipation fins 243 and the plurality of second sub heat dissipation fins 244 along the third direction. The plurality of first sub-heat dissipation fins 243 and the plurality of second sub-heat dissipation fins 244 are all arranged along the first direction. In addition, the size of the plurality of first sub-heat dissipation fins 243 along the first direction is smaller than the size of the plurality of second sub-heat dissipation fins 244 along the first direction, the power tube 230 and the plurality of first sub-heat dissipation fins 243 are located on the same side of the heat dissipation substrate 241, and the power tube 230 is arranged between the plurality of first sub-heat dissipation fins 243 and the first side plate 211.

As shown in fig. 4 to 7, the plurality of first sub-heat-dissipating fins 243 have a size a in the first direction, and the plurality of second sub-heat-dissipating fins 244 have a size b in the first direction.

In the case where the thickness of the first sub heat dissipation fin 243 and the thickness of the second sub heat dissipation fin 244 are the same, the size of the plurality of first sub heat dissipation fins 243 in the first direction is smaller than the size of the plurality of second sub heat dissipation fins 244 in the first direction, it may be understood that the number of second sub heat dissipation fins 244 is greater than the number of first sub heat dissipation fins 243.

In this embodiment, as shown in fig. 5 and 7, the power tube 230 is tiled along the first direction, that is, the projected area of the power tube 230 along the third direction is larger than the projected area of the power tube 230 along the first direction and the projected area of the power tube 230 along the second direction. In addition, the power tube 230 and the heat dissipation substrate 241 are disposed along the third direction, so that the power tube 230 can transfer heat to the heat dissipation substrate 241 to the maximum extent. Further, along the third direction, the projection of the power tube 230 is located in the projection of the heat dissipation substrate 241, so that the heat dissipation area of the heat sink 240 can be ensured to be maximum.

In one embodiment, the heat dissipating substrate 241 is disposed between the plurality of first sub-heat dissipating fins 243 and the plurality of second sub-heat dissipating fins 244 along the first direction. The plurality of first sub-heat dissipation fins 243 and the plurality of second sub-heat dissipation fins 244 are all arranged along the third direction. In addition, the size of the plurality of first sub-heat dissipation fins 243 along the first direction is smaller than the size of the plurality of second sub-heat dissipation fins 244 along the first direction, the power tube 230 and the plurality of first sub-heat dissipation fins 243 are located on the same side of the heat dissipation substrate 241, and the power tube 230 is arranged between the plurality of first sub-heat dissipation fins 243 and the first back plate 215.

In this embodiment, the power tube 230 is tiled along the third direction, that is, the projected area of the power tube 230 along the first direction is larger than the projected area of the power tube 230 along the second direction and the projected area of the power tube 230 along the third direction. In addition, the power tube 230 and the heat dissipation substrate 241 are disposed along the first direction, so that the power tube 230 can transfer heat to the heat dissipation substrate 241 to the maximum extent. Further, along the first direction, the projection of the power tube 230 is located in the projection of the heat dissipation substrate 241, so that the heat dissipation area of the heat sink 240 can be ensured to be maximum.

In both the above embodiments, the second sub-heat-dissipating fins 244 are disposed on one side of the heat-dissipating substrate 241, and a portion of the first sub-heat-dissipating fins 243 and the power tube 230 are disposed on the opposite side thereof, so that the heat-dissipating substrate 241 can dissipate the heat transferred to the power tube 230 through the heat-dissipating fins on both sides. In addition, in the case where the plurality of first sub-cooling fins 243 and the plurality of second sub-cooling fins 244 are aligned in the first direction or the third direction, the air flow in the accommodating chamber can flow from below the radiator 240 to above the radiator 240 through the gaps between the adjacent cooling fins in the course of flowing from bottom to top, and heat can be dissipated to the outside through the heat exchanger 220. Further, the heat dissipation process of the photovoltaic inverter 20 is quickened.

In some embodiments, as shown in fig. 2-7, the photovoltaic inverter 20 includes a fan 260.

In one embodiment, the distance between the fan 260 and the top plate 212 is less than the distance between the heat sink 240 and the top plate 212. In one aspect, the fan 260 is capable of air cooling the components within the inverter housing 210. On the other hand, the fan 260 is disposed farther from the top plate 212 than the heat sink 240, and the air flow in the accommodating chamber flows from bottom to top by the fan 260. When the air flow in the accommodating cavity flows from bottom to top, the heat dissipated by the radiator 240 is taken away, and the heat is dissipated to the outside through the heat exchanger 220. Further, the heat dissipation process of the photovoltaic inverter 20 is quickened.

In one embodiment, the distance between the fan 260 and the first side plate 211 is greater than the distance between the fan 260 and the heat exchanger 220. That is, the fan 260 is disposed closer to the heat exchanger 220 with respect to the first side plate 211, so that the fan 260 can rapidly circulate the cool air flow, which is exchanged by the heat exchanger 220, into the accommodating chamber. Further, the heat dissipation process of the photovoltaic inverter 20 is quickened.

In one embodiment, in the second direction, the projection of the heat sink 240 at least partially overlaps the projection of the fan 260. The fan 260 is disposed below the heat sink 240, so that the cold air flow blown out by the fan 260 can quickly carry away the heat emitted from the heat sink 240, thereby accelerating the heat dissipation process of the photovoltaic inverter 20.

In some embodiments, the photovoltaic inverter 20 includes a printed circuit board 250, which printed circuit board 250 is used to secure the power modules.

The printed circuit board 250 is arranged between the bottom of the recess structure and the power module. For example, as shown in fig. 2 to 7, in an embodiment in which the heat dissipation substrates 241 of the power tubes 230 and the heat sink 240 are arranged in the first direction, the printed circuit board 250 is arranged between the first side plate 211 and the power tubes 230. For another example, in an embodiment in which the heat dissipation substrates 241 of the power tubes 230 and the heat sink 240 are arranged in the third direction, the printed circuit board 250 is arranged between the first rear plate 215 and the power tubes 230.

In the present embodiment, the printed circuit board 250 may also be referred to as a printed circuit board set. Wherein the collection of printed circuit boards is also referred to as printed circuit board assembly, or PCBA for short.

The components accommodated in the accommodation chamber are described in detail above. Hereinafter, a detailed description will be given of a specific structure of the heat exchanger 220 with reference to fig. 2 to 7.

The heat exchanger 220 according to embodiments of the present application may also be referred to as a divided wall heat exchanger. Specifically, the heat exchanger 220 is a fin type heat exchanger, and the heat exchanger 220 shown in fig. 2 to 5 is a plate type heat exchanger, and the heat exchanger 220 shown in fig. 6 and 7 is a tube type heat exchanger.

As shown in fig. 2 to 5, the heat exchanger 220 includes a second side plate 221 and a third side plate 222 that are oppositely arranged in the first direction. Wherein the second side plate 221 is arranged between the third side plate 222 and the first side plate 211, the interval between the second side plate 221 and the top plate 212 is smaller than the interval between the third side plate 222 and the top plate 212, and the interval between the second side plate 221 and the bottom plate 213 is smaller than the interval between the second side plate 221 and the bottom plate 213. The side of the third side plate 222 facing away from the second side plate 221 has a plurality of heat exchanger plates 223 arranged in a third or second direction, the plurality of heat exchanger plates 223 forming a heat exchanger plate group.

It should be noted that, in the case where the photovoltaic inverter 20 is placed along the gravity direction, the heat exchange fins do not block the flow of the external air flow, that is, the external air flow can flow from bottom to top from the gaps between the adjacent heat exchange fins of the heat exchanger 240. And, under the action of the fan 260, the heat dissipation fins do not block the flow of the air flow in the groove structure, that is, the air flow in the groove structure can flow from bottom to top from the gap between two adjacent heat dissipation fins of the heat sink 240. Accordingly, in the case where the heat radiating fins of the heat sink 240 are arranged in the second direction, the plurality of heat exchanging fins 223 are also arranged in the second direction. In the case where the heat radiating fins of the heat sink 240 are arranged in the third direction, the plurality of heat exchanging fins 223 are also arranged in the third direction.

Under the action of the fan 260, the air flow carrying heat in the inverter case 210 flows to the space between the second side plate 221 and the top plate 212, and then flows into the space between the second side plate 221 and the third side plate 222 along the space between the second side plate 221 and the top plate 212. Under the action of gravity, the air flow flowing into the gap between the second side plate 221 and the third side plate 222 flows from top to bottom, and during the flowing process, the heat carried in the air flow is dissipated to the outside through the third side plate 222 and the heat exchange plate 223, and the air flow returns to the space between the first side plate 211 and the second side plate 221 again through the interval between the second side plate 221 and the bottom plate 213. Further, the air flow in the space between the first side plate 211 and the second side plate 221 dissipates the heat dissipated from the heat sink 240 to the outside during the circulation.

In this embodiment, the second side plate 221 is attached to the first front plate 214 and the first rear plate 215, respectively. The third side panel 222 is attached to the top panel 212, the bottom panel 213, the first front panel 214, and the first rear panel 215, respectively. The first side plate 211, the top plate 212, the bottom plate 213, the first front plate 214, the first rear plate 215, and the second side plate 221 of the heat exchanger 220 are enclosed to form the accommodating chamber as described above. The space between the second side plate 221 and the third side plate 222 forms an air flow heat exchanging channel of the heat exchanger 220, the space between the second side plate 221 and the top plate 212 forms an air inlet of the air flow heat exchanging channel, and the space between the second side plate 221 and the bottom plate 213 forms an air outlet of the air flow heat exchanging channel.

In some embodiments, the space between the second side plate 221 and the bottom plate 213 and the projection of the fan 260 at least partially overlap in the first direction, so that the flow of the air flowing from the space between the second side plate 221 and the bottom plate 213 can be accelerated to flow back into the space between the first side plate 211 and the second side plate 221.

In some embodiments, the projection of the heat sink 240 and the space between the second side plate 221 and the top plate 212 at least partially overlap in the first direction, so that the flow of air from the space between the first side plate 211 and the second side plate 221 into the space between the second side plate 221 and the third side plate 222 can be accelerated.

In one embodiment, as shown in fig. 2 or 4, the heat exchanger 220 further includes a third front plate 2251 and a third rear plate 2252 arranged opposite in a third direction. Among them, the third front plate 2251 is attached to the second side plate 221 and the third side plate 222, respectively, along one face perpendicular to the second direction, the third front plate 2251 is attached to the inner wall of the top plate 212, along the other face perpendicular to the second direction, and the third front plate 2251 is attached to the inner wall of the first front plate 214, along one face perpendicular to the third direction. Further, the third rear plate 2252 is attached to the second side plate 221, the third side plate 222, respectively, along a face perpendicular to the second direction, the third rear plate 2252 is attached to the inner wall of the top plate 212, along the other face perpendicular to the second direction, and the third rear plate 2252 is attached to the inner wall of the first rear plate 215, along the face perpendicular to the third direction.

In one embodiment, as shown in fig. 2 or 4, the heat exchanger 220 further includes a fourth front plate 2261 and a fourth rear plate 2262 that are arranged opposite in the third direction. Wherein, the fourth front panel 2261 is attached to the second side plate 221 and the third side plate 222 along one side perpendicular to the second direction, the fourth front panel 2261 is attached to the bottom plate 213 along the other side perpendicular to the second direction, and the fourth front panel 2261 is attached to the inner wall of the first front panel 214 along one side perpendicular to the third direction. Further, the fourth rear panel 2262 is attached to the second side plate 221, the third side plate 222, respectively, along a face perpendicular to the second direction, the fourth rear panel 2262 is attached to the inner wall of the bottom plate 213 along another face perpendicular to the second direction, and the fourth rear panel 2262 is attached to the inner wall of the first rear panel 215 along a face perpendicular to the third direction.

In the above two embodiments, the heat exchanger 220 is assembled first, and then the assembled heat exchanger 220 is matched with the opening of the inverter housing 210, so as to complete the assembly of the photovoltaic inverter 20, and simplify the assembly operation of the photovoltaic inverter 20.

In one embodiment, to stably connect the heat exchanger 220 with the inverter case 210, the heat exchanger 220 includes not only the third front plate 2251 and the third rear plate 2252, but also the fourth front plate 2261 and the fourth rear plate 2262. The descriptions of the third front panel 2251, the third rear panel 2252, the fourth front panel 2261, and the fourth rear panel 2262 may be referred to the above-mentioned related descriptions, and will not be repeated here.

In the heat exchanger shown in fig. 2 to 5, the third front plate 2251, the third rear plate 2252, and the portion of the third side plate 222 between the third front plate 2251 and the third rear plate 2252 form one flow guide groove of the heat exchanger 220. The third front plate 2251 and the third rear plate 2252 are two groove walls of the flow guiding groove, and the portion of the third side plate 222 located between the third front plate 2251 and the third rear plate 2252 is a groove bottom of the flow guiding groove. The flow channel and the first top plate 212 enclose a flow guiding cavity of the heat exchanger 220. In addition, the fourth front plate 2261, the fourth rear plate 2262, and the portion of the third side plate 222 between the fourth front plate 2261 and the fourth rear plate 2262 form another flow guide groove of the heat exchanger 220. The fourth front plate 2261 and the fourth rear plate 2262 are two groove walls of the flow guiding groove, and the portion of the third side plate 222 between the fourth front plate 2261 and the fourth rear plate 2262 is the groove bottom of the flow guiding groove. The flow guide groove and the first bottom plate 213 enclose another flow guide cavity of the heat exchanger 220. Thus, along the second direction, the two diversion trenches of the heat exchanger 220 are oppositely arranged between the walls of the groove structure, the two diversion trenches are respectively used for enclosing the walls of the groove structure to form two diversion cavities, and the two diversion cavities are oppositely arranged along the second direction.

The second side plate 221, the third side plate 222, the fifth front plate 300 and the fifth rear plate 310 are heat exchange substrates, and the second side plate 221, the third side plate 222, the fifth front plate 300 and the fifth rear plate 310 form a heat dissipation chamber of the heat exchanger 220. The heat dissipation cavity penetrates through the heat exchange substrate along the second direction, and in addition, the heat dissipation cavity is arranged between the two flow guide cavities along the second direction and is communicated with the groove structure through the two flow guide cavities.

In some embodiments, the dimension of the flow guiding groove along the first direction is greater than the dimension of the heat exchange substrate along the first direction. As shown in fig. 2 to 5, the third front plate 2251 or the third rear plate 2252 has a dimension in the first direction that is greater than a distance between the second side plate 221 and the third side plate 222. The dimension of the fourth front panel 2261 or the fourth rear panel 2262 in the first direction is greater than the distance between the second side panel 221 and the third side panel 222.

In some embodiments, as shown in fig. 6 and 7, the heat exchanger 220 includes a second side plate 221 and a third side plate 222 that are oppositely arranged in a first direction, and a second front plate 223 and a second rear plate 224 that are oppositely arranged in a third direction. Wherein a second side plate 221 is disposed between the third side plate 222 and the first side plate 211, the second side plate 221 being attached to the top plate 212, the bottom plate 213, the first front plate 214, the first rear plate 215, respectively. The second front plate 223 is attached to the second side plate 221 and the third side plate 222, respectively, and the second rear plate 224 is attached to the second side plate 221 and the third side plate 222, respectively, and a space between the second front plate 223 and the second rear plate 224 is smaller than a space between the first front plate 214 and the first rear plate 215. Further, the second side plate 221 is provided with a first through hole 2211 and a second through hole 2212 penetrating the second side plate 221 in the first direction, a distance between the first through hole 2211 and the top plate 212 is smaller than a distance between the second through hole 2212 and the top plate 212, and the first through hole 2211 and the second through hole 2212 are respectively disposed between the second front plate 223 and the second rear plate 224. In addition, the side of the second front plate 223 facing away from the second rear plate 224 is provided with a plurality of first heat exchange fins 2231 arranged in the first direction, the side of the second rear plate 224 facing away from the second front plate 223 is provided with a plurality of second heat exchange fins 2241 arranged in the first direction, and the side of the third side plate 222 facing away from the second side plate 221 is provided with a plurality of heat exchange fins arranged in the third direction. The first plurality of heat exchanger fins 2231 forms one heat exchanger fin set and the second plurality of heat exchanger fins 2241 forms another heat exchanger fin set.

Under the action of the fan 260, the air flow carrying heat in the inverter case 210 flows into the gap between the second side plate 221 and the third side plate 222 along the first through hole 2211 at the first through hole 2211 flowing to the second side plate 221. Under the action of gravity, the air flows into the gaps between the second side plate 221, the third side plate 222, the second front plate 223 and the second rear plate 224 from top to bottom, and during the flowing process, the heat carried in the air flows is dissipated to the outside through the second front plate 223, the second rear plate 224, the first heat exchange fins 2231 and the second heat exchange fins 2241, and the air flows back into the space between the first side plate 211 and the second side plate 221 through the second through holes 2212 of the second side plate 221. Further, the air flow in the space between the first side plate 211 and the second side plate 221 radiates heat radiated from the radiator 240 to the outside during the circulation flow.

In this embodiment, the second side plate 221 is attached to the top plate 212, the bottom plate 213, the first front plate 214, and the first rear plate 215, respectively. The first side plate 211, the top plate 212, the bottom plate 213, the first front plate 214, the first rear plate 215, and the second side plate 221 of the heat exchanger 220 are enclosed to form the accommodating chamber as described above. The space among the third side plate 222, the second front plate 223 and the second rear plate 224 forms an air flow heat exchange channel of the heat exchanger 220, the first through hole 2211 is an air inlet of the air flow heat exchange channel, and the second through hole 2212 is an air outlet of the air flow heat exchange channel.

In some embodiments, the projection of the second through hole 2212 and the projection of the fan 260 at least partially overlap in the first direction, so that the process of flowing the air flow flowing from the second through hole 2212 back into the space between the first side plate 211 and the second side plate 221 can be accelerated.

In some embodiments, the projection of the heat sink 240 and the projection of the first through hole 2212 at least partially overlap in the first direction, so that the flow of the air from the space between the first side plate 211 and the second side plate 221 into the first through hole 2212 can be accelerated.

In one embodiment, as shown in fig. 6, the heat exchanger 220 further includes a third front plate 2251 and a third rear plate 2252 arranged opposite in a third direction. Among them, the third front plate 2251 is attached to the second side plate 221 along a face perpendicular to the first direction, the third front plate 2251 is attached to an inner wall of the top plate 212 along a face perpendicular to the second direction, and the third front plate 2251 is attached to an inner wall of the first front plate 214 along a face perpendicular to the third direction. Further, the third rear plate 2252 is attached to the second side plate 221 along a face perpendicular to the first direction, the third rear plate 2252 is attached to the inner wall of the top plate 212 along a face perpendicular to the second direction, and the third rear plate 2252 is attached to the inner wall of the first rear plate 215 along a face perpendicular to the third direction. In this embodiment, along the third direction, the projection of the first through hole 2211 is located between the projections of the two faces of the third front plate 2251 or the third rear plate 2252 that are oppositely arranged along the second direction.

In one embodiment, to reduce the volume of the photovoltaic inverter 20, the third front plate 2251 and the third rear plate 2252 are disposed above the heat sink 240 in the second direction.

Further, in order to improve the efficiency of transferring the heat dissipated from the heat sink 240 to the first through hole 2211, as shown in fig. 6, the heat exchanger 220 further includes a first barrier 2271, and the first barrier 2271 is provided with a through hole T1 penetrating in the second direction. Accordingly, the air flow in the inverter case 210 flows to the first through hole 2211 through the through hole T1.

In one embodiment, as shown in fig. 6, the heat exchanger 220 further includes a fourth front plate 2261 and a fourth rear plate 2262 that are oppositely arranged along the third direction. Wherein the fourth front panel 2261 is attached to the second side panel 221 along a face perpendicular to the first direction, the fourth front panel 2261 is attached to the inner wall of the bottom panel 213 along a face perpendicular to the second direction, and the fourth front panel 2261 is attached to the inner wall of the first front panel 214 along a face perpendicular to the third direction. Further, the fourth rear panel 2262 is attached to the second side panel 221 along a face perpendicular to the first direction, the fourth rear panel 2262 is attached to the inner wall of the bottom panel 213 along a face perpendicular to the second direction, and the fourth rear panel 2262 is attached to the inner wall of the first rear panel 215 along a face perpendicular to the third direction. In this embodiment, the projection of the second through hole 2212 is located between the projections of the two faces of the fourth front plate 2261 or the fourth rear plate 2262 which are oppositely arranged in the second direction.

In one embodiment, to reduce the volume of the photovoltaic inverter 20, the fourth front and rear plates 2261, 2262 are disposed below the heat sink 240 in the second direction.

Further, in order to increase the rate of the air flow flowing into the inverter case 210 from the second through hole 2212, as shown in fig. 6, the heat exchanger 220 further includes a fourth side plate 228, and the fourth side plate 228 is used to connect the fourth front plate 2261 and the fourth rear plate 2262. Further, the heat exchanger 220 further includes a second barrier 2272 and a third barrier 2273 which are oppositely arranged in the second direction, the second barrier 2272 being attached to the fourth front plate 2261, the fourth rear plate 2262, the fourth side plate 228 and the second side plate 221, respectively, and the second barrier 2272 being provided with a through hole T2 penetrating in the second direction. Further, the third barrier panel 2273 is attached to the fourth front panel 2261, the fourth rear panel 2262, the fourth side panel 228, and the second side panel 221, respectively. Accordingly, the air flow flowing into the gaps between the second side plate 221, the third side plate 222, the second front plate 223, and the second rear plate 224 flows back into the inverter case 210 through the through hole T2.

In this embodiment, the projection of the fan 260 at least partially overlaps with the projection of the through hole T2 in the second direction, so that the flow of the air flowing in from the through hole T2 can be accelerated to flow back into the space between the first side plate 211 and the second side plate 221.

In one embodiment, to stably connect the heat exchanger 220 with the inverter case 210, the heat exchanger 220 includes not only the third front plate 2251 and the third rear plate 2252, but also the third front plate 2251 and the third rear plate 2252. The descriptions of the third front plate 2251, the third rear plate 2252, the third front plate 2251, and the third rear plate 2252 may be referred to the above-mentioned related descriptions, and will not be repeated here.

In some embodiments, the top plate 212 extends from the first side plate 211 to the third side plate 222, i.e., the inner wall of the top plate 212 is attached to the top end of the first side plate 211, the top end of the second side plate 221, and the top end of the third side plate 222, respectively. Further, the bottom plate 213 also extends from the first side plate 211 to the third side plate 222, i.e., the inner wall of the bottom plate 213 is attached to the bottom end of the first side plate 211, the bottom end of the second side plate 221, and the bottom end of the third side plate 222, respectively.

In some embodiments, as shown in fig. 6 and 7, the second front plate 223 includes an upper front plate, a middle front plate, and a lower front plate connected in sequence, and the upper front plate and the lower front plate are disposed opposite to each other along the second direction, and the upper front plate and the lower front plate are disposed perpendicular to the middle front plate, respectively. The second back plate 224 includes an upper back plate, a middle back plate and a lower back plate connected in sequence, and the upper back plate and the lower back plate are oppositely arranged along the second direction, and the upper back plate and the lower back plate are respectively and vertically arranged with the middle back plate. Further, the heat exchanger 220 further includes a fifth side plate 2291, a sixth side plate 2292, a seventh side plate 2293, and an eighth side plate 2294, and a ninth side plate 2295 disposed between the second side plate 221 and the third side plate 222, which are sequentially arranged in the second direction. Wherein the fifth side plate 2291 is attached to the second side plate 221, the third side plate 222, the upper front plate, and the upper rear plate, respectively. The sixth side plate 2292 is attached to the second side plate 221, the ninth side plate 2295, the upper front plate, and the upper rear plate, respectively. The seventh side panel 2293 is attached to the second side panel 221, the ninth side panel 2295, the lower front panel, and the lower rear panel, respectively. The eighth side plate 2294 is attached to the second side plate 221, the third side plate 222, the lower front plate, and the lower rear plate, respectively. The ninth side panel 2295 connects the middle front panel and the middle rear panel, respectively. In this embodiment, the third side plate 222, the fifth side plate 2291, the sixth side plate 2292, the seventh side plate 2293, the eighth side plate 2294, the ninth side plate 2295, the second front plate 223, and the second rear plate 224 are enclosed to form an air flow heat exchange channel of the heat exchanger 220, and when the air flow entering the air flow heat exchange channel is able to dissipate heat in the air flow to the outside through the first heat exchange fins 2231 and the second heat exchange fins 2241.

In the heat exchanger shown in fig. 6 to 7, in one embodiment, the third front plate 2251, the third rear plate 2252, and the portion of the second side plate 221 between the third front plate 2251 and the third rear plate 2252 form one flow guide groove of the heat exchanger 220. The third front plate 2251 and the third rear plate 2252 are two groove walls of the flow guiding groove, and the portion of the second side plate 221 between the third front plate 2251 and the third rear plate 2252 is a groove bottom of the flow guiding groove. The flow channel and the first top plate 212 enclose a flow guiding cavity of the heat exchanger 220. The fourth front plate 2261, the fourth rear plate 2262, and the portion of the second side plate 221 between the fourth front plate 2261 and the fourth rear plate 2262 form another flow guide groove of the heat exchanger 220. The fourth front plate 2261 and the fourth rear plate 2262 are two groove walls of the flow guiding groove, and the portion of the second side plate 221 between the fourth front plate 2261 and the fourth rear plate 2262 is the groove bottom of the flow guiding groove. The flow guide groove and the first bottom plate 213 enclose another flow guide cavity of the heat exchanger 220.

In one embodiment, as shown in fig. 6 and 7, the third front plate 2251, the third rear plate 2252, the first barrier 2271, and the portion of the second side plate 221 between the third front plate 2251 and the third rear plate 2252 form one flow guide groove of the heat exchanger 220. The third front plate 2251, the third rear plate 2252, and the first baffle 2271 are three groove walls of the flow guide groove, respectively, and the portion of the second side plate 221 between the third front plate 2251 and the third rear plate 2252 is a groove bottom of the flow guide groove. The flow channel and the first top plate 212 enclose a flow guiding cavity of the heat exchanger 220. The portions of the fourth front panel 2261, the fourth rear panel 2262, the fourth side panel 228, the second barrier 2272, and the second side panel 221 between the fourth front panel 2261 and the fourth rear panel 2262 form another flow guide groove of the heat exchanger 220. The fourth front plate 2261, the fourth rear plate 2262, and the second baffle 2272 are respectively three groove walls of the flow guiding groove, and the portions of the second side plate 221 located on the fourth front plate 2261 and the fourth rear plate 2262 are groove bottoms of the flow guiding groove. The flow guide groove and the first bottom plate 213 enclose another flow guide cavity of the heat exchanger 220.

Thus, along the second direction, the two diversion trenches of the heat exchanger 220 are oppositely arranged between the walls of the groove structure, the two diversion trenches are respectively used for enclosing the walls of the groove structure to form two diversion cavities, and the two diversion cavities are oppositely arranged along the second direction.

The third side plate 222, the fifth side plate 2291, the sixth side plate 2292, the seventh side plate 2293 and the eighth side plate 2294, the ninth side plate 2295, the second front plate 223 and the second rear plate 224 form one flow guiding column of the heat exchanger 220. The third side plate 222, the fifth side plate 2291, the sixth side plate 2292, the seventh side plate 2293, and the eighth side plate 2294, the ninth side plate 2295, the second front plate 223, and the second rear plate 224 enclose an internal channel of the flow post. The inner passage communicates with the two flow guiding cavities of the heat exchanger 220 through the first and second through holes 2211 and 2212, respectively, i.e. projections of the two flow guiding cavities along the first direction cover projections of the inner flow channel inlet and projections of the inner flow channel outlet, respectively.

In some embodiments, the dimension of the flow guiding groove along the first direction is greater than the dimension of the heat exchange substrate along the first direction. As shown in fig. 6 and 7, the third front panel 2251 or the third rear panel 2252 has a dimension in the first direction that is greater than a dimension of the second side panel 221 in the first direction. The dimension of the fourth front panel 2261 or the fourth rear panel 2262 in the first direction is greater than the dimension of the second side panel 221 in the first direction.

It should be noted that, in the case where the photovoltaic inverter 20 is placed along the gravity direction, the heat exchange fins do not block the flow of the external air flow, that is, the external air flow can flow from bottom to top from the gaps between the adjacent heat exchange fins of the heat exchanger 240. The heat dissipating fins do not block the flow of the air flow inside the groove structure under the action of the fan 260, i.e., the air flow inside the groove structure can flow from bottom to top from the gap between two adjacent heat dissipating fins of the heat sink 240.

It should be understood that in the specific structure of the heat exchanger 220 referred to above, the distance between the fan 260 and the heat exchanger 220 may be understood as the distance between the fan 260 and the second side plate 221.

In some embodiments, as shown in fig. 2 to 7, the photovoltaic inverter 20 further includes a heat conducting layer 270, and the heat conducting layer 270 is connected to the heat dissipating substrate 241 of the heat sink 240 and the power tube 230 in a heat conducting contact manner. The heat conductive layer 270 can perform an insulating and heat conductive function, and further, the efficiency of transferring heat generated by the power tube 230 to the heat sink 240 can be improved through the heat conductive layer 270.

Illustratively, the thermally conductive layer 270 is a thermally conductive interface material. Therein, the thermally conductive interface material is also referred to as thermal interface material, or simply TIM. Specifically, TIMs include, but are not limited to, silicone grease, thermally conductive gels, graphite films, phase change materials, and the like.

It should be noted that the number of flow guide columns, the number of fans 260, and the number of heat dissipating fins or heat exchanging fins of the heat exchanger 220 in fig. 6 and 7 are only examples. In addition, the heat exchanger 220 shown in fig. 6 and 7 may be replaced by the heat exchanger 220 shown in fig. 2 and 3, and the specific structure will not be described here.

In some embodiments, the inverter housing 210 is formed by deep drawing. Correspondingly, the inverter housing 210 has a relatively simple structure, low manufacturing cost and high mass production efficiency.

In some embodiments, the material used for the inverter housing 210 is plastic. Accordingly, the weight of the photovoltaic inverter 20 can be effectively reduced.

In some embodiments, the power module includes other power transistors, such as power transistor 231 shown in fig. 4-7, in addition to power transistor 230.

Further, in some embodiments, corresponding heat sinks may be disposed near other power tubes. In one embodiment, the other power tubes and the power tube 230 may share a heat sink 240 as shown in fig. 2-7. The connection between the other power tube and the heat sink 240 may refer to the connection between the power tube 230 and the heat sink 240, and will not be described herein. In one embodiment, the other power tubes and the power tube 230 may be provided with a heat sink 240 as shown in fig. 2 to 7, respectively.

Further, in some embodiments, a thermally conductive layer may also be provided between the other power tubes and the heat sink. A heat conductive layer 271 may also be provided between the power tube 231 and its corresponding heat sink as shown in fig. 4-7.

In some embodiments, the devices contained in the receiving cavity include other non-heat dissipating devices, such as capacitors, resistors, etc., in addition to the power tubes. Accordingly, through the photovoltaic inverter 20 described above, the internal temperature of the cavity formed by the heat exchanger 220 and the inverter housing 210 can be effectively reduced, so that the risk of overtemperature caused by high-heat-consumption devices such as temperature sensitive devices such as a power tube baking capacitor can be avoided.

In some embodiments, the printed circuit board 250 may be attached to the inner wall of the inverter case 210 by glue or screws.

The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes and substitutions are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. The utility model provides a photovoltaic inverter, its characterized in that, photovoltaic inverter includes inverter housing, circuit board, power module, radiator and heat exchanger, the circuit board is used for fixing power module, power module is used for encapsulating at least one power tube, the radiator is used for power module heat dissipation, inverter housing includes groove structure, groove structure is used for holding the circuit board power module and the radiator, wherein:

the heat exchanger is used for closing the groove structure, the groove bottoms of the groove structure and the heat exchangers are arranged oppositely along a first direction, and the circuit board is arranged between the groove bottoms of the groove structure and the heat exchangers.

2. The photovoltaic inverter of claim 1, wherein the heat exchanger comprises two diversion trenches, the two diversion trenches are oppositely arranged between the walls of the groove structure along a second direction, the second direction is perpendicular to the first direction, the two diversion trenches are respectively used for enclosing the walls of the groove structure to form two diversion cavities, and the two diversion cavities are oppositely arranged along the second direction.

3. The photovoltaic inverter of claim 2 wherein the heat exchanger further comprises a heat exchange substrate comprising a heat dissipation cavity extending through the heat exchange substrate in the second direction, the heat dissipation cavity being arranged between the two flow guiding cavities in the second direction, the heat dissipation cavity being in communication with the groove structure through the two flow guiding cavities;

the size of the diversion trench along the first direction is larger than the size of the heat exchange substrate along the first direction.

4. The photovoltaic inverter of claim 2 wherein the heat exchanger further comprises a flow post comprising an internal flow channel for communicating the two flow directing cavities, projections of the two flow directing cavities along the first direction covering projections of the internal flow channel inlet and projections of the internal flow channel outlet, respectively.

5. The photovoltaic inverter of claim 4,

the groove bottom of each of the two diversion trenches comprises a through hole, the through hole penetrates through the groove bottom of each diversion trench along the first direction, and the groove bottom of the groove structure and the groove bottom of each diversion trench are arranged along the first direction;

The inner flow channel is communicated with the flow guiding cavity through a through hole at the bottom of each flow guiding groove.

6. The photovoltaic inverter of claim 2 wherein one of the two flow channels comprises a channel bottom and two channel walls, wherein:

the two groove walls of the one diversion trench are oppositely arranged along a third direction which is perpendicular to the first direction and the second direction,

along the first direction, the groove bottoms of the groove structures and the groove bottoms of the diversion trenches are arranged oppositely,

the groove bottom of one guide groove is fixedly connected with the two groove walls of the one guide groove, and along the first direction, the two groove walls of the one guide groove are positioned between the groove bottom of the one guide groove and the groove bottom of the groove structure.

7. The photovoltaic inverter of claim 6 wherein, in the first direction, the heat sink overlaps a projected portion of one of the two flow channels and the heat sink does not overlap a projected portion of the other of the two flow channels.

8. The photovoltaic inverter of claim 6 wherein one of the two channels further comprises another channel wall, wherein:

Along the second direction, the other groove wall of the one diversion trench is positioned between the two groove walls of the one diversion trench and the other diversion trench of the two diversion trenches,

the other groove wall of the one diversion trench is provided with a through hole penetrating along the second direction, and the radiator is overlapped with the projection part of the through hole along the second direction.

9. The photovoltaic inverter of claim 2 wherein the photovoltaic inverter comprises a fan, the groove structure further configured to receive the fan, wherein:

the fan is fixedly connected with one of the two diversion trenches, or

The fan is fixedly connected with the groove wall of the groove structure, along the first direction, the projection part of the fan and one of the two diversion trenches is overlapped, and the projection of the fan and the other diversion trench is not overlapped.

10. The photovoltaic inverter of claim 1 wherein the heat exchanger comprises a heat exchange substrate and a heat exchange plate set, each heat exchange plate set comprising a plurality of heat exchange plates, wherein:

along the first direction, the circuit board and the heat exchange plates are respectively arranged on two sides of the heat exchange substrate, and the power module and the radiator are arranged between the circuit board and the heat exchange substrate.

11. The photovoltaic inverter of claim 10 wherein the heat exchange substrate comprises a heat dissipation cavity extending through the heat exchange substrate in a second direction, the heat dissipation cavity being configured to communicate with the recessed structure.

12. The photovoltaic inverter of claim 11 wherein the heat exchange substrate comprises four substrates, wherein:

two substrates of the four substrates are oppositely arranged along the first direction, the other two substrates are oppositely arranged along the third direction, and gaps of the four substrates form the heat dissipation cavity.

13. The photovoltaic inverter of claim 10, wherein the heat exchanger plate group comprises a first heat exchanger plate group, wherein a plurality of heat exchanger plates of the first heat exchanger plate group are respectively fixed on a side surface of the heat exchanger base plate, which faces away from the groove structure, and the plurality of heat exchanger plates of the first heat exchanger plate group are arranged at intervals along a third direction or a second direction, and the third direction is perpendicular to the first direction and the second direction.

14. The photovoltaic inverter of claim 10 or 13,

the heat exchange plate group comprises a second heat exchange plate group, the second heat exchange plate group comprises a flow guide column, a plurality of heat exchange plates of the second heat exchange plate group are respectively and fixedly connected with the flow guide column, and the plurality of heat exchange plates of the second heat exchange plate group are arranged at intervals along the first direction or the third direction.

15. The photovoltaic inverter of claim 14 wherein the heat exchanger plate group comprises two of the second heat exchanger plate groups, the two of the second heat exchanger plate groups being spaced apart along the third direction, wherein:

and along the third direction, the flow guide columns of one second heat exchange plate group and the flow guide columns of the other second heat exchange plate group are arranged at intervals, and two sides of the flow guide column of each second heat exchange plate group are respectively fixed with a plurality of heat exchange plates.

16. The photovoltaic inverter of claim 1 wherein the photovoltaic inverter comprises a fan and the inverter housing comprises two side plates that respectively form part of the groove walls of the groove structure, wherein:

along the second direction, the two side plates of the inverter housing are arranged oppositely, the fan is arranged between the two side plates, the distance between the fan and one side plate of the two side plates of the inverter housing is larger than that between the fan and the other side plate, and the distance between the fan and one side plate of the two side plates of the inverter housing is larger than that between the radiator and the one side plate.

17. The photovoltaic inverter of claim 1 wherein the heat sink comprises a heat dissipating substrate and a plurality of heat dissipating fins, the heat dissipating substrate being fixedly connected to at least one of the power module or the circuit board, the heat dissipating substrate comprising two opposite sides, wherein:

at least one of the two side surfaces of the heat dissipation substrate is used for being in heat conduction contact with the power module, and one or more of the two side surfaces of the heat dissipation substrate are used for being fixedly connected with the plurality of heat dissipation fins.

18. The photovoltaic inverter of claim 17, wherein the heat dissipating substrate and the circuit board are arranged in a stack along the first direction, the power module is arranged between the circuit board and the heat dissipating substrate, and two sides of the heat dissipating substrate are arranged opposite along the first direction, wherein:

the power module is in heat conduction connection with one side surface of the heat dissipation substrate, and the plurality of heat dissipation fins are arranged on the other side surface of the heat dissipation substrate at intervals along the second direction or the third direction.

19. The photovoltaic inverter of claim 17 wherein the heat dissipating substrate is arranged adjacent to the power module in a second direction or a third direction, wherein:

The power module is in heat conduction connection with one side surface of the heat dissipation substrate, the plurality of heat dissipation fins are respectively fixed on one side surface of the heat dissipation substrate and the other side surface of the heat dissipation substrate, and the number of the heat dissipation fins fixed on the other side surface of the heat dissipation substrate is greater than that of the heat dissipation fins fixed on the one side surface.

20. A photovoltaic power generation system comprising a photovoltaic module for converting light energy into electrical energy and a photovoltaic inverter according to any one of claims 1-19 for converting direct current from the photovoltaic module into alternating current.