Junction box of laminated solar cell
By designing a junction box for tandem solar cells and integrating current and voltage using a control substrate and voltage processing chip, the problems of complex networking and high cable costs of tandem solar cells are solved, achieving stable current and voltage output and simplifying the networking process.
Patent Information
- Application Number
- CN202520876799.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-06
- Publication Date
- 2026-02-24
- Estimated Expiration
- 2035-05-06
AI Technical Summary
Existing grid-connection methods for tandem solar cells are complex and prone to errors, have high cable costs, and are difficult to achieve stable current and voltage output.
Design a junction box for tandem solar cells, including a control substrate, input terminal, output terminal, voltage processing chip and DSP chip. Through series and parallel connections, integrate the current and voltage of the tandem solar cells, use diodes to prevent incorrect connection, and simplify the networking process.
It achieves stable DC voltage and constant current output, avoids the risk of incorrect cable connection, simplifies the networking process, and reduces cable usage and costs.
Smart Images
Figure CN223942666U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of tandem solar cell manufacturing technology, and specifically relates to a junction box for tandem solar cells. Background Technology
[0002] Integrating tandem solar cells into a power grid requires an inverter because the output current and voltage of the upper and lower layers of the solar cell array are mismatched. Current grid connection methods involve first connecting the upper layers of the solar cells in series and parallel to form an upper cell array, and then connecting the lower layers in series and parallel to form a lower cell array. The total current and voltage of the upper and lower cell arrays are then matched before connecting them to the inverter. This grid connection method is not only extremely complex in terms of wiring and construction, making it prone to errors and fires, but also incurring high cable costs. Utility Model Content
[0003] The technical problem to be solved by this utility model is to provide a junction box for tandem solar cells, which connects all the input terminals of the tandem solar cells and integrates them into a single output terminal. This not only outputs a stable DC voltage and achieves constant current output, but also avoids the risk of incorrect cable connection, simplifies the networking process of tandem solar cells, reduces the use of cables, and lowers networking costs.
[0004] This invention is implemented as follows: a junction box for a tandem solar cell is provided, including a housing with a control substrate inside. A first input terminal, a second input terminal, a junction box output terminal, a first voltage processing chip, a second voltage processing chip, and a DSP chip are respectively disposed on the control substrate. One end of the first input terminal is connected in series with the first cell of the tandem solar cell, and the other end is connected in series with the input terminal of the first voltage processing chip. One end of the second input terminal is connected in series with the second cell of the tandem solar cell, and the other end is connected in series with the input terminal of the second voltage processing chip. The output terminals of the first and second voltage processing chips are respectively connected in parallel with the junction box output terminal. The DSP chip is provided with a current input terminal, a voltage input terminal, and a PWM output terminal. The current input terminal and the voltage input terminal are respectively connected to the second input terminal, and the PWM output terminal is connected to the other input terminal of the first voltage processing chip.
[0005] Furthermore, a diode is also provided on the control board, and the diode is connected to a line at the output end of the junction box.
[0006] Furthermore, the first cell of the tandem solar cell is a crystalline silicon cell, and the second cell of the tandem solar cell is a perovskite cell.
[0007] Furthermore, the first voltage processing chip is a boost chip, and the second voltage processing chip is a buck chip.
[0008] Compared with existing technologies, the junction box of this utility model for a tandem solar cell includes a housing with an internal control substrate. The control substrate has a first input terminal, a second input terminal, a junction box output terminal, a first voltage processing chip, a second voltage processing chip, and a DSP chip. The first input terminal connects the first solar cell of the tandem solar cell and the input terminal of the first voltage processing chip in series. The second input terminal connects the second solar cell of the tandem solar cell and the input terminal of the second voltage processing chip in series. The output terminals of the first and second voltage processing chips are connected in parallel to the junction box output terminal. The current and voltage input terminals of the DSP chip are connected to the second input terminal, and the PWM output terminal is connected to the other input terminal of the first voltage processing chip. This utility model not only outputs a stable DC voltage and achieves constant current output, but also avoids the risk of incorrect cable connections, simplifies the networking process of tandem solar cells, reduces cable usage, and lowers networking costs. Attached Figure Description
[0009] Figure 1 This is a schematic diagram of the circuit principle of the junction box of the stacked solar cell of this utility model.
[0010] The symbols in the image are as follows:
[0011] 1. Control board; 2. First input terminal; 3. Second input terminal; 4. Junction box output terminal; 5. First voltage processing chip; 6. Second voltage processing chip; 7. DSP chip; 8. Current input terminal; 9. Voltage input terminal; 10. PWM output terminal; 11. Diode;
[0012] A. First solar cell; B. Second solar cell; + is the positive DC terminal, - is the negative DC terminal;
[0013] The arrows in the diagram indicate the direction of signal, current, or voltage transmission. Detailed Implementation
[0014] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.
[0015] Please refer to Figure 1As shown, a preferred embodiment of the junction box of the tandem solar cell of this utility model includes a box body (not shown in the figure) with a control substrate 1 inside. The control substrate 1 is provided with a first input terminal 2, a second input terminal 3, a junction box output terminal 4, a first voltage processing chip 5, a second voltage processing chip 6 and a DSP chip 7.
[0016] The positive and negative terminals of one end of the first input terminal 2 are connected in series with the positive and negative terminals of the first cell A of the tandem solar cell, and the positive and negative terminals of the other end are connected in series with the positive and negative terminals of the input terminal of the first voltage processing chip 5. The positive and negative terminals of one end of the second input terminal 3 are connected in series with the positive and negative terminals of the second cell B of the tandem solar cell, and the positive and negative terminals of the other end are connected in series with the positive and negative terminals of the input terminal of the second voltage processing chip 6. The positive and negative terminals of the output terminals of the first voltage processing chip 5 and the second voltage processing chip 6 are connected in parallel with the positive and negative terminals of the junction box output terminal 4, respectively.
[0017] The DSP chip 7 is equipped with a current input terminal 8, a voltage input terminal 9, and a PWM output terminal 10. The current input terminal 8 and voltage input terminal 9 are respectively connected to the second input terminal 3, and the PWM output terminal 10 is connected to another input terminal of the first voltage processing chip 5. A diode 11 is also provided on the control substrate 1, and the diode 11 is connected to a line on the output terminal 4 of the junction box. Figure 1 As shown, diode 11 is placed on the positive line of the output terminal 4 of the junction box to prevent the risk caused by incorrect wiring.
[0018] The first cell A of the tandem solar cell is a crystalline silicon cell, and the second cell B is a perovskite cell. The first voltage processing chip 5 is a boost chip, and the second voltage processing chip 6 is a buck chip.
[0019] Because crystalline silicon solar cells have low voltage and high current, while perovskite solar cells have high voltage and low current, the input terminal of crystalline silicon solar cells needs to be boosted by the first voltage processing chip 5, while the input terminal of perovskite solar cells needs to be bucked by the second voltage processing chip 6, so that the voltage after the boost chip is close to the voltage after the buck chip is processed.
[0020] The function of DSP chip 7 is to monitor the voltage and current parameters on one side of the perovskite solar cell in real time, and control the boost chip on the crystalline silicon solar cell side based on the feedback of this data to ensure that the outputs on both sides are synchronized, thereby achieving the effect of voltage stabilization and constant current.
[0021] In the grid connection process of tandem solar cells, the first cell A and the second cell B of each tandem solar cell are first integrated together using the junction box of this invention. The positive and negative terminals of the first cell A and the second cell B are connected to the first input terminal 2 and the second input terminal 3 of the junction box, respectively. Then, the relevant output terminals 4 of the junction box are connected in series and parallel as needed. Finally, it is connected to the inverter. Therefore, after using this invention for grid connection, not only is a stable DC voltage output from the junction box achieved, resulting in a constant current output, but the risk of incorrect cable connection is also avoided, simplifying the grid connection process of tandem solar cells, reducing cable usage, and lowering grid connection costs.
[0022] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A junction box for a tandem solar cell, comprising a housing containing a control substrate, characterized in that, A first input terminal, a second input terminal, a junction box output terminal, a first voltage processing chip, a second voltage processing chip, and a DSP chip are respectively disposed on the control substrate. One end of the first input terminal is connected in series with the first cell of the tandem solar cell, and the other end is connected in series with the input terminal of the first voltage processing chip. One end of the second input terminal is connected in series with the second cell of the tandem solar cell, and the other end is connected in series with the input terminal of the second voltage processing chip. The output terminals of the first and second voltage processing chips are respectively connected in parallel with the junction box output terminal. The DSP chip is respectively provided with a current input terminal, a voltage input terminal, and a PWM output terminal. The current input terminal and the voltage input terminal are respectively connected to the second input terminal, and the PWM output terminal is connected to the other input terminal of the first voltage processing chip.
2. The junction box for the tandem solar cell as described in claim 1, characterized in that, A diode is also provided on the control board, and the diode is connected to a line at the output end of the junction box.
3. The junction box for the tandem solar cell as described in claim 1, characterized in that, The first cell of the tandem solar cell is a crystalline silicon cell, and the second cell of the tandem solar cell is a perovskite cell.
4. The junction box of the tandem solar cell as described in claim 3, characterized in that, The first voltage processing chip is a boost chip, and the second voltage processing chip is a buck chip.