Photovoltaic module bypass protection junction box with low power consumption and low heating
By using power electronic switching devices, drive units and energy storage units in the photovoltaic module bypass protection junction box to replace Schottky power diodes, the problems of high power consumption and heat generation in the prior art are solved, the effect of low power consumption and low heat generation is achieved, and the service life of the component is extended.
Patent Information
- Application Number
- CN202411748404.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-02
- Publication Date
- 2025-03-18
AI Technical Summary
In the existing photovoltaic module bypass protection junction box, the high power consumption and heat generation of Schottky power diodes cause heat to the component, affecting the life of the component.
A bypass protection junction box for photovoltaic modules with low power consumption and low heat generation is designed, and a power electronic switch, a driving unit and an energy storage unit are used to replace Schottky's power diode. It is set in parallel with the battery cell through a printed circuit board, and the power electronic switching device replaces Schottky's forward and reverse switches, reducing forward voltage drop, reducing power loss and heat generation.
By using power electronic switching devices, the forward voltage drop during bypass protection of photovoltaic modules is ≤0.1V, the power loss is small, and the heat generated is also small, which extends the service life of the module.
Smart Images
Figure CN119652248A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of bypass protection junction boxes in photovoltaic modules, and in particular to a photovoltaic module bypass protection junction box with low power consumption and low heat generation. Background Art
[0002] Due to the characteristics of photovoltaic modules, when the cells are blocked from light to a certain extent, the corresponding cells will change from power generation units to power consumption units. At the same time, the blocked cells will generate a lot of heat due to the long-term current flow, which will cause hot spots to form on the modules.
[0003] The existing method is to install a corresponding bypass protection device, i.e., a bypass protection junction box for photovoltaic modules, on each substring cell of the photovoltaic module. The bypass protection junction box uses a Schottky power diode as the core bypass protection device. When the substring cell is blocked from light, the current of the photovoltaic module passes through the Schottky power diode in the bypass protection junction box. The Schottky power diode generates a forward voltage drop of about 0.3 volts to 0.5 volts, resulting in a large power consumption of each Schottky power diode, resulting in a large power loss in a small junction box and a large amount of heat. Summary of the invention
[0004] In view of the deficiencies in the prior art, an object of the present invention is to provide a photovoltaic module bypass protection junction box with low power consumption and low heat generation, which has the effects of low power loss and low heat generation.
[0005] The above technical objectives of the present invention are achieved through the following technical solutions: A low-power-consumption and low-heat photovoltaic module bypass protection junction box comprises a photovoltaic module, wherein the photovoltaic module comprises a plurality of battery cells, and a plurality of bypass protection junction boxes are arranged on the photovoltaic module, wherein the bypass protection junction boxes comprise a junction box body, and the number of the junction box bodies is equal to the number of battery cells; The junction box body comprises a box body, the box body comprises a base and a cover plate, a printed circuit board is arranged in the base, and a power electronic switch, a drive unit and an energy storage unit are arranged on the printed circuit board; The printed circuit board is arranged in parallel with the corresponding battery sheet.
[0006] In a preferred example, the present invention can be further configured as follows: the driving unit and the power electronic switch are separately arranged.
[0007] In a preferred example, the present invention may be further configured as follows: the pad on the printed circuit board separates the driving unit from the power electronic switch.
[0008] In a preferred example, the present invention may be further configured as follows: there are at least two pads between the driving unit and the power electronic switch.
[0009] In a preferred example, the present invention can be further configured as follows: a plurality of heat dissipation holes are provided at the bottom of the base.
[0010] In summary, the present invention includes at least one of the following beneficial technical effects: 1. By setting a power electronic switch, a drive unit and an energy storage unit in the junction box, the power electronic switch device replaces the Schottky forward and reverse switch. When the current of the photovoltaic module passes through the bypass protection, the forward voltage drop generated by the module is ≤0.1V, the power loss is small, and the heat generated is also small.
[0011] 2. By separating the power electronic switch from the drive unit, the heat generated by the power electronic switch is prevented from affecting the drive unit.
[0012] 3. By opening heat dissipation holes on the base of the box body, the internal temperature of the box body can be further reduced. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a schematic diagram of the overall structure of this embodiment; Figure 2 Schematic diagram of the electrical structure of the battery cell, power electronic switch, drive unit and energy storage unit in this embodiment; Figure 3 yes Figure 1 Enlarged structural diagram at A in the middle.
[0014] In the figure, 1, junction box body; 11, box body; 12, printed circuit board; 2, power electronic switch; 21, drive unit; 22, energy storage unit. DETAILED DESCRIPTION
[0015] The present invention is further described in detail below in conjunction with the accompanying drawings.
[0016] Example: Reference Figure 1-Figure 3 As shown, the present invention discloses a low-power, low-heat photovoltaic module bypass protection junction box, including a photovoltaic module, wherein the photovoltaic module includes a plurality of battery cells, and a plurality of bypass protection junction boxes are arranged on the photovoltaic module, and the bypass protection junction box includes a junction box body 1, and the number of the junction box bodies 1 is equal to the number of battery cells. The junction box body 1 includes a box body 11. The box body 11 includes a base and a cover plate. A plurality of heat dissipation holes are provided at the bottom of the base. A printed circuit board 12 is arranged in the base. Four columns are arranged at the bottom of the inner wall of the base, and the four columns pass through the printed circuit board 12. The columns are glued to the printed circuit board 12. The printed circuit board 12 is arranged in parallel with the corresponding battery cells.
[0017] A power electronic switch 2, a drive unit 21 and an energy storage unit 22 are disposed on the printed circuit board 12. The power electronic switch 2, the drive unit 21 and the energy storage unit 22 are electrically connected.
[0018] The driving unit 21 and the power electronic switch 2 are separately arranged.
[0019] The pads on the printed circuit board 12 separate the driving unit 21 from the power electronic switch 2. There are at least two pads between the driving unit 21 and the power electronic switch 2.
[0020] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.
Claims
1. A low-power, low-heat photovoltaic module bypass protection junction box, comprising a photovoltaic module, wherein the photovoltaic module comprises a plurality of cells, characterized in that: A plurality of bypass protection junction boxes are arranged on the photovoltaic assembly, the bypass protection junction boxes comprising a junction box body (1), the number of the junction box bodies (1) being equal to the number of solar cells; The junction box body (1) comprises a box body (11), the box body (11) comprises a base and a cover plate, a printed circuit board (12) is arranged in the base, and a power electronic switch (2), a drive unit (21) and an energy storage unit (22) are arranged on the printed circuit board (12); The printed circuit board (12) is arranged in parallel with the corresponding battery cell.
2. The low power consumption and low heat generation photovoltaic module bypass protection junction box according to claim 1, characterized in that: The drive unit (21) and the power electronic switch (2) are arranged separately.
3. The low power consumption and low heat generation photovoltaic module bypass protection junction box according to claim 2 is characterized in that: The pads on the printed circuit board (12) separate the drive unit (21) from the power electronic switch (2).
4. The low power consumption and low heat generation photovoltaic module bypass protection junction box according to claim 3 is characterized in that: There are at least two welding pads between the drive unit (21) and the power electronic switch (2).
5. The low power consumption and low heat generation photovoltaic module bypass protection junction box according to claim 4, characterized in that: A plurality of heat dissipation holes are provided at the bottom of the base.