Photovoltaic power generation inverter and temperature detection device

Abstract

This application provides a photovoltaic inverter and a temperature detection device. The photovoltaic inverter includes a plurality of photovoltaic terminals, a converter, a PCB circuit board, a temperature detection circuit, and a controller. The plurality of photovoltaic terminals are connected to a plurality of corresponding photovoltaic modules. The PCB circuit board includes a conductive layer and at least one thermally conductive insulating layer. One end of each photovoltaic terminal is soldered to the PCB circuit board, and the other end is thermally conductively connected to a corresponding photovoltaic module. The conductive layer transmits electrical energy generated by the plurality of photovoltaic modules to the converter. Each thermally conductive insulating layer conducts heat generated by at least one photovoltaic terminal. The temperature detection circuit detects the temperature of each thermally conductive insulating layer. The controller obtains the temperature of each of the plurality of photovoltaic terminals based on the temperature of each thermally conductive insulating layer. To ensure the reliability of the entire photovoltaic power generation, the temperature of the photovoltaic terminals is detected using the temperature detection circuit so that the actual temperature of the photovoltaic terminals can be monitored in real time before the photovoltaic terminals catch fire.

Description

[Technical Field]

[0001] This application claims priority to Chinese Patent Application No. 202211527833.4, entitled "Photovoltaic Power Inverter and Temperature Detection Device," filed with the State Intellectual Property Office of the People's Republic of China on November 30, 2022, which is incorporated herein by reference in its entirety. This application relates to the field of photovoltaics, and in particular to photovoltaic inverters and temperature sensing devices. [Background technology]

[0002] Photovoltaics is a technology that converts light energy into electrical energy using the photovoltaic effect at a semiconductor interface. A photovoltaic power generation system typically includes a photovoltaic module, a photovoltaic terminal, an inverter, and an AC power distribution device. The photovoltaic module is typically mounted on a photovoltaic rack that is fixedly supported on the ground to generate power at a fixed location. To obtain a high output voltage or current, a photovoltaic power generation unit is typically a photovoltaic string formed by connecting multiple photovoltaic modules in series and / or parallel.

[0003] Currently, each photovoltaic module is connected to a photovoltaic inverter or a photovoltaic-DC combiner box using a photovoltaic terminal (also called a connector). The photovoltaic terminal transmits the current output by the photovoltaic module to the inside of the photovoltaic inverter or the photovoltaic-DC combiner box through a reliable electrical connection to perform current inversion so that electrical energy can enter an end user or be connected to the power grid. The existing wiring process for photovoltaic terminals specifically involves stripping a cable and crimping the stripped cable portions separately on both sides of the photovoltaic terminal using a dedicated cable tool, with one side of the cable connected to the photovoltaic module and the other side of the cable connected to the photovoltaic inverter or the photovoltaic-DC combiner box. If the photovoltaic terminal and the cable are insufficiently crimped, excessive contact resistance is likely to occur, resulting in heat generation, and even aging and fire.

[0004] Currently, there is no on-board solution for detecting the temperature of the photovoltaic terminals connected between the photovoltaic module and the inverter. In view of this, to ensure the reliability of power generation in the whole system, the photovoltaic inverter needs to be designed to monitor the actual temperature of the photovoltaic terminals in real time before the photovoltaic terminals catch fire. Summary of the Invention

[0005] This application provides a photovoltaic inverter and a temperature detection device, in order to ensure the reliability of power generation of the entire photovoltaic inverter, the temperature of the photovoltaic terminal is detected by using a temperature detection circuit, so as to monitor the actual temperature of the photovoltaic terminal in real time before the photovoltaic terminal ignites.

[0006] According to a first aspect, this application provides a photovoltaic inverter. The photovoltaic inverter includes a plurality of photovoltaic terminals, a converter, a PCB circuit board, a temperature detection circuit, and a controller. A plurality of photovoltaic modules are configured to be connected to the plurality of photovoltaic terminals. The PCB circuit board includes a conductive layer and at least one thermally conductive insulating layer. One end of each photovoltaic terminal is soldered to the PCB circuit board, and the other end is thermally conductively connected to a corresponding photovoltaic module. The conductive layer is configured to transmit electrical energy generated by each photovoltaic module to the converter. Each thermally conductive insulating layer is configured to conduct heat generated by the at least one photovoltaic terminal. The temperature detection circuit is configured to detect the temperature of each thermally conductive insulating layer. The controller is configured to obtain the temperature of each of the plurality of photovoltaic terminals based on the temperature of each thermally conductive insulating layer.

[0007] By using the photovoltaic inverter provided in this application, the heat generated by each photovoltaic terminal can be conducted by using at least one thermally conductive insulating layer, and the heat can be finally conducted to a temperature detection circuit, and the temperature of each of the multiple photovoltaic terminals is obtained by detecting the temperature of each thermally conductive insulating layer, so as to avoid the problems of aging, over-temperature, and fire caused by insufficient crimping of the photovoltaic terminals.

[0008] In one possible implementation, between each photovoltaic terminal and the temperature detection circuit, the PCB circuit board includes a thermally conductive insulating layer and a thermally conductive path formed by solder joints connecting the multiple photovoltaic terminals to the PCB circuit board. Each photovoltaic terminal is soldered to the PCB circuit board to form multiple solder joints, and each thermally conductive insulating layer is connected to at least one solder joint to form a thermally conductive path formed by the thermally conductive insulating layer and the solder joint formed between the photovoltaic terminal and the PCB circuit board. Thus, the temperature detection circuit determines the temperature of each photovoltaic terminal by detecting the different thermally conductive insulating layers. This design can significantly reduce the number of temperature detection circuits and reduce temperature detection costs. Each thermally conductive insulating layer includes a thermally conductive material, and the thermally conductive material is covered with an insulating material.

[0009] In one possible implementation, the thermally conductive material includes one or more of graphite, copper foil, or aluminum foil, and the insulating material includes one or more of epoxy resin, silicone rubber, insulating ceramic, or glass.

[0010] In one possible implementation, the thermally conductive material forms a thermally conductive layer, the insulating material forms an insulating layer, the upper and lower surfaces of the thermally conductive layer are separately overlaid with insulating layers to form a thermally conductive insulating layer, and the insulating layer covers and is attached to the overlaid thermally conductive layer.

[0011] Because multiple photovoltaic power generation terminals and converters are arranged on both sides of the PCB circuit board, if only one temperature detection circuit is arranged, the temperature detection circuit will be easily affected by the external ambient temperature, causing temperature detection errors. In one possible implementation, the temperature detection circuit specifically includes a first temperature detection circuit and a second temperature detection circuit. The multiple photovoltaic power generation terminals and converters are arranged on both sides of the PCB circuit board. The PCB circuit board includes a first thermally conductive insulating layer and a second thermally conductive insulating layer, with the first thermally conductive insulating layer closer to the converter side and the second thermally conductive insulating layer closer to the photovoltaic power generation terminal side. The first temperature detection circuit is configured to detect the temperature of the first thermally conductive insulating layer. The second temperature detection circuit is configured to detect the temperature of the second thermally conductive insulating layer. The controller is configured to obtain the temperature of each of the multiple photovoltaic power generation terminals based on the temperatures of the first thermally conductive insulating layer and the second thermally conductive insulating layer.

[0012] The heat conduction path between the photovoltaic power generation terminal and the first or second temperature detection circuit can be the photovoltaic power generation terminal (plug-in point), the solder joint formed between the photovoltaic power generation terminal and the PCB circuit board, and the first or second temperature detection circuit. This design makes the overall design of the temperature detection circuit simple and feasible, and temperature detection is performed by using the first and second temperature detection circuits, making the temperature detection more accurate.

[0013] In one possible implementation, the solar power inverter further includes a housing structure and a mounting panel. The housing structure includes a cutout. The converter is disposed inside the housing structure. The mounting panel includes a through-hole for the solar power terminal to pass through. The mounting panel is configured to be attached to the housing structure and close the cutout.

[0014] In a specific installation, the housing structure and the mounting panel may be fixed via soldering or adhesive bonding, or by using screws. Alternatively, in some possible implementations, the housing structure and the mounting panel may be an integral structure. Before the multiple photovoltaic terminals are soldered onto the PCB circuit board, the multiple photovoltaic terminals may first be fixed to the mounting panel to position the multiple photovoltaic terminals, thereby facilitating soldering between the photovoltaic terminals and the PCB circuit board. After the photovoltaic terminals and the PCB circuit board are soldered, the entire structure including the photovoltaic terminals, the PCB circuit board, and the mounting panel is mounted within the notch of the housing structure.

[0015] In one possible implementation, a sealant or a baffle plate is disposed in the gap between the photovoltaic power generation terminal and the through-hole, thereby forming a sealed environment inside the housing structure. Because a cooling device such as a fan is present inside the housing structure, the sealant or the baffle plate is disposed in the gap between the photovoltaic power generation terminal and the through-hole so as to form a sealed environment inside the housing structure in order to suppress the influence of the fan on the temperature detection of the PCB circuit board and the temperature detection circuit.

[0016] In one possible implementation, each photovoltaic power generation terminal includes a board-side terminal, a cable-side terminal, a first conductive core, a second conductive core, a first conductive cable, and a second conductive cable. The board-side terminal has a channel extending through two ends thereof, the first conductive core is slidably disposed within the channel of the board-side terminal, one end of the first conductive cable is crimped onto the first conductive core, and the other end of the first conductive cable is soldered onto a PCB circuit board. The cable-side terminal has a channel extending through two ends thereof, the second conductive core is slidably disposed within the channel of the cable-side terminal, one end of the second conductive cable is crimped onto the second conductive core, and the other end of the second conductive cable is connected to the photovoltaic module. After the board-side terminal is connected to the cable-side terminal, the first conductive core establishes an electrical connection to the second conductive core, thereby allowing current output by the photovoltaic module to be input to the converter using the photovoltaic power generation terminal.

[0017] In order to reduce heat loss along the heat conduction path, in one possible implementation, the solar power generation inverter further includes a terminal plug-in temperature detection circuit, which is disposed at a position where the board-side terminal and the cable-side terminal of the solar power generation terminal are connected, and is configured to detect the temperature of the solar power generation terminal.

[0018] The terminal plug-in temperature detection circuit is located adjacent to the solar power generation terminal, which can significantly reduce heat loss along the conduction path and maximize the reflection of the temperature of the solar power generation terminal for more accurate temperature protection. The terminal plug-in temperature detection circuit is located at the position where the board-side terminal and the cable-side terminal of the corresponding solar power generation terminal are connected, and detects the temperature of the solar power generation terminal.

[0019] Also, in one possible implementation, if the temperature detection circuit is placed on a PCB circuit board, the temperature detection circuit should be placed as far away as possible from circuits with large current flows in order to reduce temperature detection errors caused by heating due to thermal effects.

[0020] If the temperature detection circuit must be placed in a location where there is a large current flow, self-heating on the PCB circuit board can also be reduced by adding grooves or protrusions on the circuit, and current-flow heating can be reduced by increasing the width of the conductive material in the location where there is a large current flow.

[0021] According to a second aspect, the present application provides a temperature detection device applicable to a photovoltaic inverter. The temperature detection device includes a temperature detection circuit, a PCB circuit board, and a controller. The photovoltaic inverter includes a plurality of photovoltaic terminals and a converter. The plurality of photovoltaic terminals are configured to be connected to a plurality of photovoltaic modules correspondingly. The PCB circuit board includes a conductive layer and at least one thermally conductive insulating layer. One end of each photovoltaic terminal is soldered to the PCB circuit board, and the other end is thermally conductively connected to a corresponding photovoltaic module. The conductive layer is configured to transmit electrical energy generated by each photovoltaic module to the converter. Each thermally conductive insulating layer is configured to conduct heat generated by at least one photovoltaic terminal. The temperature detection circuit is configured to detect the temperature of each thermally conductive insulating layer.

[0022] These and other aspects of the present application will be made more concise and easier to understand in the following description of the embodiments. [Brief explanation of the drawings]

[0023] [Figure 1] FIG. 1 is a first diagram of the configuration of a solar power generation inverter. [Figure 2] FIG. 1 is a diagram of a heat conduction path between a solar power generation terminal and a temperature detection circuit. [Figure 3] FIG. 2 is a second diagram of the configuration of a solar power generation inverter. [Figure 4] FIG. 2 is a diagram of the configuration of the housing structure. [Figure 5] This is the first diagram of the configuration of the solar power generation terminal. [Figure 6] This is the second diagram of the solar power generation terminal configuration. DETAILED DESCRIPTION OF THE INVENTION

[0024] To make the objectives, technical solutions, and advantages of this application clearer, the following description will further explain this application in detail with reference to the accompanying drawings. However, implementation examples can be implemented in multiple forms and should not be construed as being limited to the implementations described herein. Rather, these implementations are provided to make this application more comprehensive and complete and to fully convey the concepts of the implementation examples to those skilled in the art. The same reference symbols in the accompanying drawings indicate the same or similar components. Therefore, repeated descriptions thereof will be omitted. Expressions of positions and directions in this application are explained by using the accompanying drawings as examples. However, changes can be made as necessary, and all such changes fall within the scope of protection of this application. The accompanying drawings in this application are only used to illustrate relative positional relationships and are not intended to represent actual scales.

[0025] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings. A specific operation method in a method embodiment may also be applied to an apparatus embodiment or a system embodiment. In the description of this application, "at least one" means one or more, and "plurality" means two or more. In light of this, in the embodiments of the present invention, "plurality" can also be understood as "at least two." The term "and / or" describes a relationship between related objects and indicates that three relationships may exist. For example, A and / or B may represent three cases: only A exists, both A and B exist, and only B exists. Furthermore, the character " / " generally indicates an "or" relationship between related objects unless otherwise specified. It should be understood that in the description of this application, terms such as "first" and "second" are used only for distinction and explanation, and should not be understood as indicating or implying relative importance or order.

[0026] In the embodiments of this application, "connection" means an electrical connection, and a connection between two electrical elements can be a direct or indirect connection between the two electrical elements. For example, a connection between A and B may be a direct connection between A and B, or an indirect connection between A and B via one or more other electrical elements. For example, a connection between A and B may also represent that A is directly connected to C, C is directly connected to B, and A and B are connected via C.

[0027] In a photovoltaic power generation system, a DC source is generally formed by photovoltaic modules on the DC side. The photovoltaic modules are connected to a DC combiner box by using photovoltaic terminals. The currents of the module strings are combined by using the DC combiner box and connected to a converter. The converter converts the DC generated by the photovoltaic modules into AC, which is then connected to the power grid to complete the photovoltaic power generation process.

[0028] As the application of solar power generation becomes more and more widespread, people are exposed to more and more problems caused by solar power generation systems, and a serious problem is the fire problem caused by solar power generation systems, which can cause huge losses of human life and property.

[0029] There are many reasons for fires in photovoltaic power generation systems, for example, fires are caused by the hot spot effect generated by photovoltaic modules. The hot spot effect is as follows: when a photovoltaic module in a series branch is shaded, it is considered as a load consuming energy generated by another illuminated photovoltaic module. As a result, the shaded photovoltaic module heats up. As a result, the local current and local voltage of the photovoltaic module increase, causing a local temperature rise on the photovoltaic module. This leads to spontaneous combustion of the photovoltaic module.

[0030] In another example, if the cable connected to the photovoltaic terminal is insufficiently crimped, excessive contact resistance is likely to occur, causing DC arc heating and even aging and fire, or if the area of ​​the solder joint is too small when the cable connected to the photovoltaic terminal is soldered to the converter or photovoltaic module, the resistance also increases, causing a fire.

[0031] Currently, there are several temperature detection and protection solutions for photovoltaic modules, but no implementation solution is provided for temperature detection on photovoltaic terminals connected between the photovoltaic module and the converter. In view of this, this application provides a photovoltaic inverter for monitoring the actual temperature of the photovoltaic terminals in real time before the photovoltaic terminals catch fire, so as to ensure the reliability of the entire system.

[0032] 1 is a first diagram of the configuration of a solar power inverter. The solar power inverter 101 includes a plurality of solar power generation terminals 103, a converter 104, a printed circuit board (PCB) 105, a temperature detection circuit 106, and a controller 107. The plurality of solar power generation terminals 103 are configured to be connected to a plurality of solar power generation modules 102 in correspondence with each other.

[0033] The PCB circuit board 105 includes a conductive layer 1051 and at least one thermally conductive insulating layer 1052. One end of each photovoltaic terminal 103 is soldered to the PCB circuit board 105, and the other end is thermally conductively connected to a corresponding photovoltaic module 102. The conductive layer 1051 is configured to transmit electrical energy generated by each photovoltaic module 102 to the converter 104. Each thermally conductive insulating layer 1052 is configured to conduct heat generated by the at least one photovoltaic terminal 103.

[0034] The temperature detection circuit 106 is configured to detect the temperature of each thermally conductive and insulating layer 1052. The controller 107 is configured to obtain the temperature of each of the plurality of photovoltaic power generation terminals 103 based on the temperature of each thermally conductive and insulating layer 1052.

[0035] The photovoltaic module 102 converts solar energy into electrical energy by using the photovoltaic effect, and the converter 104 converts the electrical energy output by the photovoltaic module 102 into an appropriate alternating current or direct current and supplies the current to a power grid or a load.

[0036] The photovoltaic power generation module 102 is connected to the converter 104 by using a photovoltaic power generation terminal 103 (connector structure). The photovoltaic power generation terminal 103 has low contact resistance and also has properties such as waterproofness, high temperature resistance, corrosion resistance, and high insulation.

[0037] The PCB circuit board 105 may be any suitable type of PCB, such as a multi-layer board, a flexible PCB, a rigid PCB, or a rigid-flex PCB. The conductive layer 1051 may be a copper bus bar, an aluminum bus bar, a copper-clad aluminum bus bar, or a laminate made of copper and / or aluminum, or may be a conductive bus bar, a conductive sheet, or a laminate made of other conductive materials, without being particularly limited thereto.

[0038] The thermally conductive and insulating layer 1052 may specifically include an insulating layer and a thermally conductive layer (not specifically shown in FIG. 1 ). Materials for the insulating layer include, but are not limited to, materials such as epoxy resin, silicone rubber, insulating ceramic, and glass, as well as composite materials made of any two or more of these materials. The thermally conductive layer may be one or more of graphite, copper foil, or aluminum foil, and the copper foil may be direct bonding copper (DBC), active metal bonding copper (AMB), or the like.

[0039] The upper and lower surfaces of the thermally conductive layer are separately overlaid with insulating layers, and the insulating layers cover and attach to the overlaid thermally conductive layers to form a thermally conductive insulating layer. The PCB circuit board 105 may further include multiple adhesive layers. These adhesive layers may be separately disposed between the conductive layer 1051 and the thermally conductive insulating layer 1052 to bond the conductive layer 1051 and the thermally conductive insulating layer 1052 together. The adhesive layers may be made of acrylic adhesive or epoxy resin adhesive, or may be made of other suitable adhesive materials. In addition, other auxiliary fixing means, such as clamp components, may be provided to fix multiple different material layers together within the PCB circuit board 105. This is not particularly limited here.

[0040] The temperature detection circuit 106 may include a temperature detection device such as a thermistor or an infrared temperature detection sensor. The thermistor may be a positive temperature coefficient (PTC) thermistor, whose resistance changes positively with temperature change, or a negative temperature coefficient (PTC) thermistor, whose resistance changes inversely with temperature change. The temperature detection circuit 106 may be any of a NTC (Negative Temperature Coefficient) thermistor. A plurality of temperature detection circuits 106 may be provided to detect the temperature of the thermally conductive insulating layer 1052, respectively.

[0041] The controller 107 may be a general-purpose central processing unit (CPU), a general-purpose processor, a digital signal processing (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. The controller may implement or execute various logic blocks, modules, and circuit examples described with reference to the disclosure herein. Alternatively, the processor may be a combination that implements computing functions, such as one or more microprocessors or a combination of a DSP and a microprocessor. The controller 107 may also include an analog-to-digital converter (ADC) configured to convert input analog quantities detected by the temperature detection circuit 106 into digital quantities to determine the temperature of each photovoltaic terminal 103.

[0042] Two ends of the photovoltaic power generation terminal 103 are connected to cables, and are connected to the photovoltaic power generation module 102 and the converter 104, respectively, via the cables. Specifically, after stripping the cable, the stripped portions of the cable can be separately connected to the two ends of the photovoltaic power generation terminal 103 using a dedicated crimping tool. However, if the cable is insufficiently crimped to the photovoltaic power generation terminal 103, in the least serious case, the internal resistance on the DC side is easily affected, which results in a decrease in the power generation efficiency of the photovoltaic power generation inverter 101, or in the worse case, insufficient contact occurs, which results in the photovoltaic power generation terminal 103 being heated or even burned, further burning the converter 104, or in the worst case, causing a large-scale fire.

[0043] The photovoltaic terminals 103 should be installed at a position away from sunlight, rain, etc., to avoid aging of the interface at the photovoltaic terminals 103 or rust of the cable. However, with the development of photovoltaic technology, the capacity of a single photovoltaic module 102 also increases, and the output current of the photovoltaic module 102 also gradually increases. In the process of installing and using the photovoltaic terminals 103, more and more photovoltaic terminals 103 melt and burn, or even the converter 104 burns. Therefore, in this application, a temperature detection circuit 106 performs real-time temperature detection on the photovoltaic terminals 103 to indirectly determine the crimping state of the photovoltaic terminals 103 to ensure that the photovoltaic inverter 101 can operate normally.

[0044] 2 is a diagram of the heat conduction path between the photovoltaic terminals 103 and the temperature detection circuit. Each photovoltaic terminal 103 is soldered to a PCB circuit board 105 to form multiple solder joints. Between each photovoltaic terminal 103 and the temperature detection circuit 106, the PCB circuit board 105 includes a heat conduction path composed of multiple solder joints where the photovoltaic terminal 103 is connected to the PCB circuit board 105 and the thermally conductive insulating layer 105. As a result, the temperature detection circuit 106 obtains the temperature of each photovoltaic terminal 103 by detecting different thermally conductive insulating layers 1052. This design can significantly reduce the number of temperature detection circuits 106, thereby reducing the cost of temperature detection.

[0045] Since multiple photovoltaic power generation terminals 103 and converters 104 are arranged on both sides of the PCB circuit board 105, if only one temperature detection circuit 106 is arranged, the temperature detection circuit 106 will be easily affected by the external ambient temperature, causing temperature detection errors. FIG. 3 is a second diagram of the configuration of the photovoltaic power generation inverter. The temperature detection circuit 106 specifically includes a first temperature detection circuit 1061 and a second temperature detection circuit 1062. The PCB circuit board 105 includes a first thermally conductive insulating layer 10521 and a second thermally conductive insulating layer 10522. The first thermally conductive insulating layer 10521 is closer to the converter side, and the second thermally conductive insulating layer 10522 is closer to the photovoltaic power generation terminals 103 side.

[0046] The first temperature detection circuit 1061 is configured to detect the temperature of the first thermally conductive and insulating layer 10521. The second temperature detection circuit 1062 is configured to detect the temperature of the second thermally conductive and insulating layer 10522. The controller is configured to obtain the temperature of each of the plurality of photovoltaic power generation terminals 103 based on the temperatures of the first thermally conductive and insulating layer 10521 and the second thermally conductive and insulating layer 10522.

[0047] Since the solar power generation terminal 103 and the crimped cable are soldered to the PCB circuit board 105, the first temperature detection circuit 1061 can detect the temperature of the side where the solder joint between the solar power generation terminal 103 and the PCB circuit board 105 is formed, and the second temperature detection circuit 1062 can detect the temperature of the side where the solder joint between the solar power generation terminal 103 and the PCB circuit board 105 is not formed.

[0048] Thus, the heat conduction path between the photovoltaic power generation terminal 103 and the first temperature detection circuit 1061 or the second temperature detection circuit 1062 can be: photovoltaic power generation terminal 103 (plug-in point) - the solder joint formed between the photovoltaic power generation terminal 103 and the PCB circuit board 105 - the first temperature detection circuit 1061 / second temperature detection circuit 1062. This design makes the overall design of the temperature detection circuit 106 simple and feasible, and temperature detection is performed by using the first temperature detection circuit 1061 and the second temperature detection circuit 1062, making the temperature detection more accurate.

[0049] 4 is a diagram of the configuration of the housing structure. The solar power inverter 101 further includes a housing structure 400 and a mounting panel 401. The housing structure 400 includes a notch 402. The converter 103 is disposed inside the housing structure 400 (not shown in FIG. 4). The mounting panel 401 includes through-holes 403 for each solar power generation terminal 103 to pass through. The mounting panel 401 is configured to be attached to the housing structure 400 and to close the notch 402.

[0050] In a specific installation, the housing structure 400 and the mounting panel 401 may be fixed together through soldering, adhesive bonding, or by using screws. Alternatively, in some possible implementations, the housing structure 400 and the mounting panel 401 may be integral. For example, the mounting panel 401 may be formed by a method such as die-casting or stamping to manufacture the housing structure 400 and the mounting panel 401 as an integrated mechanical part. Specifically, before the multiple photovoltaic power generation terminals 103 are soldered to the PCB circuit board 105, the multiple photovoltaic power generation terminals 103 may first be fixed to the mounting panel 401 to position the positions of the multiple photovoltaic power generation terminals 103, thereby facilitating soldering between the photovoltaic power generation terminals 103 and the PCB circuit board 105. After the photovoltaic power generation terminals 103 and the PCB circuit board 105 are soldered together, the entire structure including the photovoltaic power generation terminals 103, the PCB circuit board 105, and the mounting panel 401 is mounted within the notch 402 of the housing structure 400.

[0051] Since a cooling device such as a fan is present inside the housing structure 400, in order to suppress the influence of the cooling device on the temperature detection of the PCB circuit board and the temperature detection circuit 106, a sealant or baffle plate may be placed in the gap between the photovoltaic power generation terminal 103 and the through hole so as to form a sealed environment inside the housing structure 400.

[0052] 5 is a first diagram of the configuration of a photovoltaic power generation terminal in one possible implementation. Each photovoltaic power generation terminal 103 specifically includes a board-side terminal 1031, a cable-side terminal 1032, a first conductive core 1033, a second conductive core 1034, a first conductive cable 1035, and a second conductive cable 1036. The board-side terminal 1031 has a channel penetrating its two ends, the first conductive core 1033 is slidably disposed in the channel of the board-side terminal 1031, one end of the first conductive cable 1035 is crimped onto the first conductive core 1033, and the other end of the first conductive cable 1035 is soldered onto the PCB circuit board 105. A channel passing through the two ends of the cable side terminal 1032 is provided in the cable side terminal 1032, the second conductive core 1034 is slidably positioned within the channel of the cable side terminal 1032, one end of the second conductive cable 1036 is crimped onto the second conductive core 1034, and the other end of the second conductive cable 1036 is connected to the solar power generation module 102.

[0053] 6 is a second diagram of a configuration of a solar power generation terminal in one possible implementation for reducing heat loss along the heat conduction path. The solar power generation inverter 101 further includes a terminal plug-in temperature detection circuit 601. The terminal plug-in temperature detection circuit 601 is disposed at a position where the board-side terminal 1031 and the cable-side terminal 1032 of the solar power generation terminal are connected, and is configured to detect the temperature of the solar power generation terminal 103.

[0054] The terminal plug-in temperature detection circuit 601 is adjacent to the photovoltaic power generation terminal 103. This can significantly reduce heat loss on the conduction path and can maximize reflection of the temperature of the photovoltaic power generation terminal 103 for more accurate temperature protection. The terminal plug-in temperature detection circuit 601 is disposed at the position where the board-side terminal 1031 and cable-side terminal 1032 of the corresponding photovoltaic power generation terminal 103 are connected, and detects the temperature of the photovoltaic power generation terminal 103.

[0055] Also, in one possible implementation, when the temperature detection circuit 106 is placed on the PCB circuit board 105, the temperature detection circuit 106 should be placed as far away as possible from circuits carrying large currents in order to reduce temperature detection errors caused by heating due to thermal effects.

[0056] If the temperature detection circuit 106 must be placed in a location where the circuit has a large current, self-heating on the PCB circuit board 105 can also be reduced by adding grooves or protrusions on the circuit, and current-carrying heating can be reduced by increasing the width of the conductive material in the location where the large current is carried.

[0057] By using the photovoltaic inverter provided in this application, the heat generated by each photovoltaic terminal can be conducted by using at least one thermally conductive insulating layer, and the heat can be finally conducted to a temperature detection circuit, and the temperature of each of the multiple photovoltaic terminals is obtained by detecting the temperature of each thermally conductive insulating layer, so as to avoid the problems of aging, over-temperature, and fire caused by insufficient crimping of the photovoltaic terminals.

[0058] Based on the same idea, this application further provides a temperature detection device applicable to a solar power inverter 101. The temperature detection device includes a temperature detection circuit, a PCB circuit board, and a controller. The solar power inverter includes a plurality of solar power terminals and a converter. The plurality of solar power terminals are configured to be connected to a plurality of solar power modules correspondingly. The PCB circuit board includes a conductive layer and at least one thermally conductive insulating layer. One end of each solar power terminal is soldered to the PCB circuit board, and the other end is thermally conductively connected to a corresponding solar power module. The conductive layer is configured to transmit electrical energy generated by each solar power module to the converter. Each thermally conductive insulating layer is configured to conduct heat generated by at least one solar power terminal. The temperature detection circuit is configured to detect the temperature of each thermally conductive insulating layer.

[0059] The above description is merely a specific implementation of this application and is not intended to limit the scope of protection of this application. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application shall fall within the scope of protection of this application. Therefore, the scope of protection of this application shall be governed by the scope of protection of the claims.

Claims

1. A photovoltaic inverter, a plurality of photovoltaic power generation terminals, a converter, a PCB circuit board, a temperature detection circuit, and a controller, the plurality of photovoltaic power generation terminals being configured to be connected to a plurality of photovoltaic power generation modules in correspondence therewith; the PCB circuit board has a conductive layer and at least one thermally conductive insulating layer, one end of each photovoltaic power generation terminal is soldered to the PCB circuit board, and the other end is thermally conductively connected to a corresponding photovoltaic power generation module; the conductive layer is configured to transmit electrical energy generated by the plurality of photovoltaic modules to the converter, and each thermally conductive insulating layer is configured to conduct heat generated by at least one photovoltaic terminal; the temperature detection circuit is configured to detect a temperature of each thermally conductive and insulating layer; the controller is configured to obtain a temperature of each of the plurality of photovoltaic power generation terminals based on the temperature of each thermally conductive insulating layer; Photovoltaic inverter.

2. 2. The solar power inverter of claim 1, wherein between each solar power generation terminal and the temperature detection circuit, the PCB circuit board has a thermal conduction path formed by the thermally conductive insulating layer and solder joints at which the plurality of solar power generation terminals are connected to the PCB circuit board.

3. 3. A photovoltaic inverter according to claim 1 or 2, wherein each thermally conductive and insulating layer comprises a thermally conductive material, the thermally conductive material being coated with an insulating material.

4. The photovoltaic inverter of claim 3 , wherein the thermally conductive material comprises one or more of graphite, copper foil, or aluminum foil.

5. 4. The photovoltaic inverter of claim 3, wherein the insulating material comprises one or more of an epoxy resin, a silicone rubber, an insulating ceramic, or a glass.

6. 4. The solar photovoltaic inverter according to claim 3, wherein the thermally conductive material forms a thermally conductive layer, the insulating material forms an insulating layer, upper and lower surfaces of the thermally conductive layer are separately overlapped with the insulating layer to form the thermally conductive insulating layer, and the insulating layer covers the overlapped thermally conductive layer and is attached to the overlapped thermally conductive layer.

7. The temperature detection circuit specifically includes a first temperature detection circuit and a second temperature detection circuit, the plurality of photovoltaic power generation terminals and the converter are respectively disposed on both sides of the PCB circuit board, the PCB circuit board includes a first thermally conductive insulating layer and a second thermally conductive insulating layer, the first thermally conductive insulating layer is closer to the converter side, and the second thermally conductive insulating layer is closer to the plurality of photovoltaic power generation terminals side; the first temperature detection circuit is configured to detect a temperature of the first thermally conductive and insulating layer; the second temperature detection circuit is configured to detect a temperature of the second thermally conductive and insulating layer; the controller is configured to obtain the temperature of each of the plurality of photovoltaic power generation terminals based on the temperatures of the first thermally conductive and insulating layer and the second thermally conductive and insulating layer. The photovoltaic inverter according to any one of claims 1 to 6.

8. 8. The solar inverter of claim 1, further comprising a housing structure and a mounting panel, the housing structure including a notch, the converter being disposed inside the housing structure, the mounting panel including a through hole for the solar terminal to pass through, and the mounting panel configured to be attached to the housing structure to close the notch.

9. The solar power inverter of claim 8 , wherein a sealant or a baffle plate is disposed in a gap between the solar power terminal and the through-hole, thereby forming a sealed environment inside the housing structure.

10. each photovoltaic power generation terminal has a board-side terminal, a cable-side terminal, a first conductive core, a second conductive core, a first conductive cable, and a second conductive cable, the board-side terminal is provided with a channel penetrating two ends of the board-side terminal, the first conductive core is slidably disposed in the channel of the board-side terminal, one end of the first conductive cable is crimped onto the first conductive core, and the other end of the first conductive cable is soldered onto the PCB circuit board, the cable-side terminal is provided with a channel penetrating two ends of the cable-side terminal, the second conductive core is slidably disposed in the channel of the cable-side terminal, one end of the second conductive cable is crimped onto the second conductive core, and the other end of the second conductive cable is connected to the photovoltaic power generation module, After the board-side terminal is connected to the cable-side terminal, the first conductive core establishes an electrical connection to the second conductive core, so that the current output by the photovoltaic module is input to the converter by using the photovoltaic terminal. A photovoltaic inverter according to any one of claims 1 to 9.

11. 11. The solar power generation inverter according to claim 10, further comprising a terminal plug-in temperature detection circuit, the terminal plug-in temperature detection circuit being arranged at a plug-in position between the board-side terminal and the cable-side terminal of the solar power generation terminal, and configured to detect a temperature of the solar power generation terminal at the plug-in position.

12. A temperature detection device applied to a solar power generation inverter, the temperature detection device including a temperature detection circuit, a PCB circuit board, and a controller, the solar power generation inverter including a plurality of solar power generation terminals and a converter, the plurality of solar power generation terminals being configured to be connected to a plurality of solar power generation modules corresponding to each other, the PCB circuit board has a conductive layer and at least one thermally conductive insulating layer, one end of each photovoltaic power generation terminal is soldered to the PCB circuit board, and the other end is thermally conductively connected to a corresponding photovoltaic power generation module; the conductive layer is configured to transmit electrical energy generated by the plurality of photovoltaic modules to the converter, and each thermally conductive insulating layer is configured to conduct heat generated by at least one photovoltaic terminal; the temperature detection circuit is configured to detect the temperature of each thermally conductive and insulating layer; Temperature detection device.

Images