Series type power optimizer for photovoltaic power generation

Abstract

The utility model provides a kind of series type power optimizer for photovoltaic power generation, including body, the body is left-right through structure, the edge of the inside of body is fixedly connected with several horizontal inner fins;The both sides of the body are fixedly connected with air-inducing fan and air blower respectively, the input end of the air-inducing fan is towards the inside of body, the output end of the air blower is towards the inside of body;The front of the body is fixedly connected with input end and output end.The utility model has the advantages that inner fin conducts and gathers heat inside body, copper pipe and high-speed airflow remove heat, copper pipe leads heat to roof, the heat dissipation area of roof can be expanded by sliding block, realize the installation of expansion plate, cooperate with the increase of several outer fins, greatly improve the heat dissipation area of device whole, above realizes the efficient stable operation of photovoltaic power optimizer under high temperature, high power density scene, provides reliable heat dissipation solution for series type photovoltaic system.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic power generation technology, and in particular to a series power optimizer for photovoltaic power generation. Background Technology

[0002] As the power density of photovoltaic modules continues to increase and the requirements for system efficiency become increasingly stringent, series power optimizers themselves face the challenges of increased power loss and heat generation. The core power semiconductor devices (such as MOSFETs and IGBTs) of the power optimizer generate significant conduction and switching losses during high-frequency switching, which are ultimately released as heat. If this heat cannot be dissipated in a timely and effective manner, the internal temperature of the optimizer will rise sharply.

[0003] Currently, common power optimizer cooling solutions mostly rely on natural convection cooling of the unit or forced air cooling with a single fan. Natural convection cooling is inefficient and cannot meet the cooling requirements of medium- to high-power applications. Traditional single-fan forced air cooling solutions often suffer from problems such as simple airflow organization, incomplete cooling channels, and difficulty in covering all critical heat-generating areas (such as power optimization modules, DC buses, and inverter modules), easily leading to localized hot spots. High temperatures degrade the performance of semiconductor devices, accelerate their aging, and may even cause overheating protection shutdowns or permanent damage, seriously affecting the long-term operational reliability and power generation revenue of photovoltaic power generation systems.

[0004] Furthermore, existing heat dissipation structures are typically fixed and have limited heat dissipation area. In compact designs with high ambient temperatures or limited internal space, fixed heat dissipation structures may not provide sufficient heat dissipation capacity. Therefore, a series-type power optimizer for photovoltaic power generation is proposed to address these issues. Utility Model Content

[0005] The purpose of this invention is to at least solve one of the aforementioned technical defects.

[0006] Therefore, one objective of this utility model is to propose a series power optimizer for photovoltaic power generation to solve the problems mentioned in the background art and overcome the shortcomings of the existing technology.

[0007] To achieve the above objectives, one embodiment of the present invention provides a series power optimizer for photovoltaic power generation, including a body, wherein the body has a left-right through structure, and a plurality of horizontally placed inner fins are fixedly connected to the inner edge of the body. An induced draft fan and an expelled draft fan are fixedly connected to both sides of the machine body, respectively. The input end of the induced draft fan faces the inside of the machine body, and the output end of the expelled draft fan faces the inside of the machine body. The front of the machine body is fixedly connected to an input terminal and an output terminal. The inside of the machine body is fixedly connected to a power optimization module, a DC bus, and an inverter module. The input terminal is connected to the power optimization module, the output terminal of the power optimization module is connected to the DC bus, the DC bus is connected to the inverter module, and the inverter module is connected to the output terminal. Several copper tubes are inserted into the inner fins, and a top plate is fixedly connected to the outer surface of the copper tubes; The top plate is suspended above the machine body, and sliders are fixedly connected to both ends of the top plate. An extension plate is sleeved on the outer surface of the slider. A pad is fixedly connected to the top surface of the copper tube and the top of the top plate, and several outer fins are fixedly connected to the top of the pad.

[0008] Preferably, the body and inner fins are made of aluminum alloy, and the ends of the inner fins are welded to the body.

[0009] The above technical solution involves the photovoltaic module inputting DC power into a power optimization module via its input terminal. The bidirectional Buck-Boost circuit within the module achieves maximum power point tracking (MPPT) through high-frequency switching. During this process, power semiconductor devices (such as MOSFETs and diodes) generate significant heat due to conduction and switching losses. This heat is conducted to the inner fins on the inside of the module via thermal pads or direct contact. The inner fins are made of aluminum alloy and are welded to the inside of the module; their lateral arrangement significantly increases the heat dissipation area. Copper tubes interspersed within the inner fins utilize high thermal conductivity to rapidly absorb heat from the inner fins, forming an efficient heat conduction path of "semiconductor device → inner fins → copper tubes". An exhaust fan draws in cool external air from the left side of the unit; as the air flows over the surfaces of the inner fins and copper tubes, heat is carried away through convection. An exhaust fan expels the heated air from the right side of the unit, forming a unidirectional airflow. The two sets of fans work together to achieve high-volume ventilation and accelerate hot air exchange. The top of the copper tubes is connected to a top plate, which is slidably connected to an extension plate via a slider. When the equipment temperature rises, the extension plate can slide outwards along the slider, increasing the exposed area of ​​the top plate. The pad and outer fins on top of the top plate further expand the heat dissipation surface area, forming a secondary heat dissipation path of "copper tube → top plate → outer fins". The DC bus connects the power optimization module and the inverter module, which converts DC power to AC power. Through the left-right through-type structure of the unit, the heat generated by the DC bus and the inverter module is isolated by the airflow, preventing mutual interference and ensuring efficient heat dissipation for each module in an independent airflow field.

[0010] Preferably, in any of the above schemes, two sets of induced draft fans and two sets of forced draft fans are provided, and airflow direction arrows are provided on the top of the induced draft fans and forced draft fans.

[0011] Preferably, in any of the above schemes, the power optimization module mainly includes a bidirectional Buck-Boost circuit, and the copper tube extends from the top of the machine body.

[0012] The device is designed with dual fans for active cooling, covering all heat-generating areas of the unit and providing high-volume ventilation. Simultaneously, internal fins conduct and collect heat from inside the unit, while copper pipes and high-speed airflow remove the heat. The copper pipes then direct the heat to the top plate, whose heat dissipation area can be expanded via sliders to accommodate the installation of expansion plates. Combined with several additional external fins, this significantly increases the overall heat dissipation area of ​​the device. All of these features enable the photovoltaic power optimizer to operate efficiently and stably in high-temperature, high-power-density scenarios, providing a reliable heat dissipation solution for series-connected photovoltaic systems.

[0013] Preferably, in any of the above schemes, the transverse portion of the copper tube is embedded in several pre-reserved slots in the top plate, and the pre-reserved slots in the top plate corresponding to the copper tube are filled with a thermally conductive silicone grease layer.

[0014] Preferably, in any of the above embodiments, the cross-sectional shape of the slider is T-shaped, and the materials of the top plate, pad plate, slider, extension plate, and outer fins are all epoxy resin.

[0015] Compared with the prior art, the advantages and beneficial effects of this utility model are as follows: This series-type power optimizer for photovoltaic power generation features a dual-fan active cooling system that covers the entire heat-generating area of ​​the unit, providing high-volume ventilation. Simultaneously, internal fins conduct and collect internal heat, while copper pipes and high-speed airflow remove the heat. The copper pipes then direct the heat to the top plate, whose heat dissipation area can be expanded via sliders to accommodate the installation of an expansion plate. Combined with several additional external fins, this significantly increases the overall heat dissipation area of ​​the device. All of these features enable the photovoltaic power optimizer to operate efficiently and stably in high-temperature, high-power-density environments, providing a reliable heat dissipation solution for series-type photovoltaic systems.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a first-view structural schematic diagram of the present invention; Figure 2 This is a structural schematic diagram of the present invention from a second perspective; Figure 3 This utility model Figure 2 Enlarged structural diagram at point A; Figure 4 This is a schematic diagram of the structure of the top plate of this utility model.

[0018] In the diagram: 1-body, 2-inner fins, 3-exhaust fan, 4-exhaust fan, 5-input end, 6-output end, 7-power optimization module, 8-DC bus, 9-inverter module, 10-copper pipe, 11-top plate, 12-slider, 13-extension plate, 14-pad plate, 15-outer fins. Detailed Implementation

[0019] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0020] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0021] like Figure 1-4 As shown, this series power optimizer for photovoltaic power generation includes a body 1, which has a left-right through structure, and several horizontally placed inner fins 2 are fixedly connected to the inner edge of the body 1. A blower 3 and a blower 4 are fixedly connected to both sides of the body 1, respectively. The input end of the blower 3 faces the inside of the body 1, and the output end of the blower 4 faces the inside of the body 1. The front of the unit 1 is fixedly connected to an input terminal 5 and an output terminal 6. Inside the unit 1, a power optimization module 7, a DC bus 8, and an inverter module 9 are fixedly connected. The input terminal 5 is connected to the power optimization module 7. The output terminal of the power optimization module 7 is connected to the DC bus 8. The DC bus 8 is connected to the inverter module 9. The inverter module 9 is connected to the output terminal 6. Several copper tubes 10 are inserted in the inner fin 2, and a top plate 11 is fixedly connected to the outer surface of the copper tubes 10; The top plate 11 is suspended above the body 1, and sliders 12 are fixedly connected to both ends of the top plate 11. An extension plate 13 is sleeved on the outer surface of the sliders 12. A pad 14 is fixedly connected to the top surface of the copper tube 10 and the top of the top plate 11, and several outer fins 15 are fixedly connected to the top of the pad 14.

[0022] Example 1: The body 1 and inner fins 2 are made of aluminum alloy, and the ends of the inner fins 2 are welded to the body 1. Two sets of induced draft fans 3 and induced draft fans 4 are provided, and airflow direction arrows are provided on the top of both fans. The power optimization module 7 mainly includes a bidirectional Buck-Boost circuit, with copper pipes 10 extending from the top of the body 1. The horizontal portion of the copper pipes 10 is embedded in several pre-reserved slots in the top plate 11, and the pre-reserved slots in the top plate 11 corresponding to the copper pipes 10 are filled with a thermally conductive silicone grease layer. The slider 12 has a T-shaped cross-section. The top plate 11, pad 14, slider 12, extension plate 13, and outer fins 15 are all made of epoxy resin.

[0023] Example 2: The photovoltaic module inputs DC power to the power optimization module 7 through input terminal 5. The bidirectional Buck-Boost circuit within the module achieves maximum power point tracking (MPPT) through high-frequency switching. During this process, power semiconductor devices (such as MOSFETs and diodes) generate a large amount of heat due to conduction and switching losses. This heat is conducted to the inner fins 2 on the inside of the housing 1 through thermal pads or direct contact. The inner fins 2 are made of aluminum alloy and are fixed to the inside of the housing 1 by welding. Their lateral arrangement significantly increases the heat dissipation area. The copper tube 10, interspersed within the inner fins 2, rapidly absorbs heat from the inner fins 2 through its high thermal conductivity, forming an efficient heat conduction path of "semiconductor device → inner fins 2 → copper tube 10". The exhaust fan 3 draws in external cold air from the left side of the unit 1. As the air flows over the surfaces of the inner fins 2 and the copper tube 10, heat is carried away through convection. The exhaust fan 4 discharges the heated air from the right side of the unit 1, forming a unidirectional airflow. The two sets of fans work together to achieve high-volume ventilation and accelerate hot air exchange. The top of the copper tube 10 is connected to the top plate 11, which is slidably connected to the extension plate 13 via a slider 12. When the equipment temperature rises, the expansion plate 13 can slide outward along the slider 12, increasing the exposed area of ​​the top plate 11. The pad 14 and outer fins 15 on top of the top plate 11 further expand the heat dissipation surface area, forming a secondary heat dissipation path of "copper pipe 10 → top plate 11 → outer fins 15". The DC bus 8 connects the power optimization module 7 and the inverter module 9, which converts DC power to AC power. Through the left-right through-structure of the body 1, the heat generated by the DC bus 8 and the inverter module 9 is isolated by the air duct, avoiding mutual interference and ensuring efficient heat dissipation of each module in an independent airflow field.

[0024] Example 3: A 10kW rooftop photovoltaic system experiences a midday solar irradiance of 1000W / m² and an ambient temperature of 35℃ in summer. Some components experience output current fluctuations due to shading. A power optimizer unit 1 is fixed below the photovoltaic array support. Input terminal 5 is connected to the shaded photovoltaic modules, and output terminal 6 is connected to a centralized inverter. Exhaust fans 3 and exhaust fans 4 face the left and right sides of unit 1, respectively, with the airflow direction arrows matching the actual wind direction.

[0025] The cooling system starts up. Initially, the photovoltaic module outputs 24V and 5A. The power optimization module 7 adjusts the duty cycle through a bidirectional Buck-Boost circuit, causing the module to operate at its maximum power point (Vmp=22V, Imp=5.2A). At this time, the temperature of the power semiconductor device rises to 60℃. Heat conduction: Heat is conducted through the inner fins 2 to the copper tube 10, and the surface temperature of the copper tube 10 rises to 70℃. Forced convection: The exhaust fan 3 draws in cool air at 3000rpm. As the air flows through the inner fins 2 and the copper tube 10, the temperature rises from 35℃ to 45℃, and the wind speed is 2m / s. The exhaust fan 4 discharges the hot air at the same speed, forming a stable airflow. When the temperature of the copper tube 10 exceeds 75℃, the design of the extension plate 13 increases the exposed area of ​​the top plate 11. The outer fins 15 absorb the heat from the copper tube 10 through the thermal grease layer, reducing the surface temperature.

[0026] Compared with the prior art, the present invention has the following advantages: This series-type power optimizer for photovoltaic power generation features a dual-fan active cooling system that covers the entire heat-generating area of ​​the unit 1, providing high-volume ventilation. Simultaneously, the inner fins 2 conduct and collect heat from inside the unit 1, while the copper pipes 10 and high-speed airflow draw the heat away. The copper pipes 10 then direct the heat to the top plate 11, whose heat dissipation area can be expanded via sliders 12 to accommodate the installation of an expansion plate 13. Combined with several additional outer fins 15, this significantly increases the overall heat dissipation area of ​​the device. All of these features enable the photovoltaic power optimizer to operate efficiently and stably in high-temperature, high-power-density scenarios, providing a reliable heat dissipation solution for series-type photovoltaic systems.

Claims

1. A series power optimizer for photovoltaic power generation, characterized in that, Includes a body (1), which has a through structure on the left and right sides, and several horizontally placed inner fins (2) are fixedly connected to the inner edge of the body (1). The machine body (1) is fixedly connected to a blower (3) and a blower (4) on both sides respectively. The input end of the blower (3) faces the inside of the machine body (1), and the output end of the blower (4) faces the inside of the machine body (1). The front of the body (1) is fixedly connected to an input terminal (5) and an output terminal (6). The inside of the body (1) is fixedly connected to a power optimization module (7), a DC bus (8), and an inverter module (9). The input terminal (5) is connected to the power optimization module (7). The output terminal of the power optimization module (7) is connected to the DC bus (8). The DC bus (8) is connected to the inverter module (9). The inverter module (9) is connected to the output terminal (6). A number of copper tubes (10) are inserted in the inner fin (2), and a top plate (11) is fixedly connected to the outer surface of the copper tubes (10). The top plate (11) is suspended above the body (1), and the two ends of the top plate (11) are fixedly connected to sliders (12), and the outer surface of the sliders (12) is fitted with an extension plate (13). A pad (14) is fixedly connected to the top surface of the copper tube (10) and the top of the top plate (11), and a number of outer fins (15) are fixedly connected to the top of the pad (14).

2. The series power optimizer for photovoltaic power generation as described in claim 1, characterized in that: The body (1) and inner fins (2) are made of aluminum alloy, and the ends of the inner fins (2) are welded to the body (1).

3. A series power optimizer for photovoltaic power generation as described in claim 2, characterized in that: The induced draft fan (3) and the blower (4) are each provided in two sets, and the top of the induced draft fan (3) and the blower (4) are provided with air flow direction arrows.

4. A series power optimizer for photovoltaic power generation as described in claim 3, characterized in that: The power optimization module (7) mainly includes a bidirectional Buck-Boost circuit, and the copper tube (10) is led out from the top of the body (1).

5. A series power optimizer for photovoltaic power generation as described in claim 4, characterized in that: The transverse portion of the copper tube (10) is embedded in several slots reserved in the top plate (11), and the reserved slots of the top plate (11) corresponding to the copper tube (10) are filled with a thermally conductive silicone grease layer.

6. A series power optimizer for photovoltaic power generation as described in claim 5, characterized in that: The cross-sectional shape of the slider (12) is T-shaped, and the materials of the top plate (11), pad (14), slider (12), extension plate (13), and outer fin (15) are all epoxy resin.

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