Photovoltaic inverter battery protection circuit board, photovoltaic inverter and photovoltaic system
By using the inverter circuit module with integrated inverter circuits and the top heat dissipation layer in the photovoltaic inverter circuit board, the inverter circuits with large area occupied by the inverter circuit, the inverter circuits, the problem of large weight and high processing costs is solved, and the effect of reducing the weight and cost of the circuit board is achieved.
Patent Information
- Application Number
- CN202421585155.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-05
- Publication Date
- 2025-06-10
- Estimated Expiration
- 2034-07-05
AI Technical Summary
In the existing photovoltaic inverter circuit boards, the inverter circuit occupies a large area, is heavy in weight and has high processing costs, especially because the need to process heat dissipation through holes on the PCB board increases the cost.
The inverter circuit module consisting of an integrated circuit layer and a heat dissipation layer arranged on the top of the circuit layer is adopted, and the top heat dissipation and the integration of multiple inverter circuits into one circuit layer is used to reduce the number of pads and the total area, and avoid processing of heat dissipation through holes.
With the premise that the function remains unchanged, the total weight and processing cost of the circuit board are reduced, and the production efficiency and equipment performance are improved.
Smart Images
Figure CN222967138U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of photovoltaic inverters, and particularly relates to a battery protection circuit board for a photovoltaic inverter, a photovoltaic inverter and a photovoltaic system. Background Art
[0002] In the circuit board of a photovoltaic inverter, an inverter circuit is usually provided. The inverter circuit is usually a bridge inverter circuit composed of multiple switching tubes (such as MOS transistors, that is, metal-oxide-semiconductor field-effect transistors) and connecting wires. In the existing circuit board of a photovoltaic inverter, the switching tubes of the inverter circuit are arranged in a dispersed manner on the PCB board, resulting in the inverter circuit occupying a large area on the circuit board, thereby increasing the weight and processing cost of the circuit board. In addition, in the design of the circuit board, bottom heat dissipation is usually adopted (that is, a heat dissipation layer is provided on the back of the PCB board for heat dissipation). Therefore, heat dissipation through holes need to be processed at the positions corresponding to each switching tube on the PCB board and thermally conductive metal is filled in the heat dissipation through holes to transfer the heat of the switching tubes to the heat dissipation layer, further increasing the processing cost.
[0003] Therefore, the prior art needs to be improved and developed. Summary of the Utility Model
[0004] The purpose of this application is to provide a battery protection circuit board for a photovoltaic inverter, a photovoltaic inverter and a photovoltaic system. Through an inverter circuit module composed of a circuit layer integrated with an inverter circuit and a heat dissipation layer provided on the top of the circuit layer, by adopting the methods of top heat dissipation and integrating multiple inverter circuits into one circuit layer, on the premise of unchanged functions, the number of pads and the total area of the circuit board are reduced, and the processing of heat dissipation through holes on the PCB board is avoided, thereby reducing the total weight and processing cost of the circuit board.
[0005] In the first aspect, this application provides a battery protection circuit board for a photovoltaic inverter, including a PCB board and an inverter circuit provided on the PCB board. The inverter circuit includes a direct current input end for connecting with a photovoltaic array, an inverter circuit module and an alternating current output end for outputting alternating current. The inverter circuit module includes a circuit layer integrated with an inverter circuit and a heat dissipation layer provided on the top of the circuit layer.
[0006] A battery protection circuit board for a photovoltaic inverter provided by this application, through an inverter circuit module composed of a circuit layer integrated with an inverter circuit and a heat dissipation layer provided on the top of the circuit layer, by adopting the methods of top heat dissipation and integrating multiple inverter circuits into one circuit layer, on the premise of unchanged functions, the number of pads and the total area of the circuit board are reduced, and the processing of heat dissipation through holes on the PCB board is avoided, thereby reducing the total weight and processing cost of the circuit board.
[0007] Optionally, the inverter circuit in the inverter circuit module is a half-bridge inverter circuit, a single-phase full-bridge inverter circuit, or a three-phase bridge inverter circuit.
[0008] A photovoltaic inverter battery protection circuit board provided by the present application can convert the direct current transmitted from the photovoltaic array to the direct current input terminal into alternating current by setting the inverter circuit as a half-bridge inverter circuit, a single-phase full-bridge inverter circuit, or a three-phase bridge inverter circuit, so as to achieve the purpose of photovoltaic power generation.
[0009] Optionally, a plurality of switching tubes are arranged on the circuit layer; the plurality of switching tubes are electrically connected to each other.
[0010] Optionally, the switching tube is a MOSFET tube, an IGBT tube, a BJT tube, or a thyristor.
[0011] Optionally, a heat-conducting insulating layer is arranged between the circuit layer and the heat dissipation layer;
[0012] The heat-conducting insulating layer is used to conduct the heat of the circuit layer into the heat dissipation layer.
[0013] A photovoltaic inverter battery protection circuit board provided by the present application can achieve the effect of top heat dissipation by arranging a heat-conducting insulating layer between the circuit layer and the heat dissipation layer, so that the heat of the circuit layer can be smoothly conducted into the heat dissipation layer.
[0014] Optionally, the inverter circuit module is a rectangular module, the long side of the inverter circuit module is not greater than 25 mm, and the short side of the inverter circuit module is not greater than 20 mm.
[0015] Optionally, the inverter circuit further includes a control chip arranged on the PCB board, and the control chip is electrically connected to the inverter circuit module.
[0016] Optionally, the inverter circuit further includes a filter capacitor arranged on the PCB board, and the filter capacitor is connected in parallel with the inverter circuit module between the positive and negative electrodes of the direct current input terminal.
[0017] In a second aspect, the present application provides a photovoltaic inverter, including the photovoltaic inverter battery protection circuit board described above.
[0018] In a third aspect, the present application provides a photovoltaic system, including the photovoltaic inverter, battery, bidirectional DC / DC circuit, and photovoltaic array described above. The photovoltaic array is electrically connected to the photovoltaic inverter, the battery is electrically connected to the bidirectional DC / DC circuit, and the bidirectional DC / DC circuit is connected in parallel with the input terminal of the inverter circuit module.
[0019] As can be seen from the above, the photovoltaic inverter battery protection circuit board, photovoltaic inverter and photovoltaic system of the present utility model adopt an inverter circuit module composed of a circuit layer integrated with an inverter circuit and a heat dissipation layer provided on the top of the circuit layer. By means of top heat dissipation and integrating multiple inverter circuits into one circuit layer, the number and total area of the pads on the circuit board are reduced without changing the function, and the processing of heat dissipation through holes on the PCB board is avoided, thereby reducing the total weight and processing cost of the circuit board.
[0020] Other features and advantages of the present application will be described in the subsequent specification, and part of them will become obvious from the specification or be understood by implementing the embodiments of the present application. The objectives and other advantages of the present application can be achieved and obtained through the structures specifically pointed out in the written specification and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 It is a schematic structural diagram of a front view of a photovoltaic inverter battery protection circuit board provided by an embodiment of the present application.
[0022] Figure 2 It is a schematic structural diagram of a top view of a photovoltaic inverter battery protection circuit board provided by an embodiment of the present application.
[0023] Figure 3 It is a circuit diagram of a photovoltaic inverter battery protection circuit board provided by an embodiment of the present application.
[0024] Figure 4 It is a circuit diagram of the circuit layer of a photovoltaic inverter battery protection circuit board provided by an embodiment of the present application.
[0025] Figure 5 It is a circuit diagram of a photovoltaic inverter provided by an embodiment of the present application.
[0026] Figure 6 It is a circuit diagram of a photovoltaic system provided by an embodiment of the present application.
[0027] Reference Numerals: 1, PCB board; 2, inverter circuit module; 3, circuit layer; 4, heat dissipation layer; 5, thermally conductive insulating layer; 6, control chip; 7, filter capacitor; 8, battery; 9, bidirectional DC / DC circuit; 10, photovoltaic array; 11, power grid; 12, load. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0028] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present utility model and should not be construed as a limitation to the present utility model.
[0029] The following disclosure provides many different embodiments or examples for implementing different structures of the present utility model. To simplify the disclosure of the present utility model, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present utility model. In addition, the present utility model may repeat reference numerals and / or reference letters in different examples. This repetition is for the purpose of simplification and clarity and does not itself indicate the relationship between the various embodiments and / or settings discussed.
[0030] As Figure 1 , Figure 2 shown, a photovoltaic inverter battery protection circuit board of the present utility model includes a PCB board 1 and an inverter circuit disposed on the PCB board 1. The inverter circuit includes a DC power input terminal for connecting to a photovoltaic array (the DC power input terminal includes a positive electrode and a negative electrode, Figure 1 and Figure 2 the DC power input terminal is not drawn in both Figure 1 and Figure 2 ), an inverter circuit module 2, and an AC power output terminal for outputting alternating current ( Figure 1 and Figure 2 the AC power output terminal is not drawn in both
[0031] The inverter circuit module 2 includes a circuit layer 3 integrated with an inverter circuit and a heat dissipation layer 4 disposed on the top of the circuit layer 3.
[0031] A photovoltaic inverter battery protection circuit board provided by the present application, through an inverter circuit module composed of a circuit layer integrated with an inverter circuit and a heat dissipation layer disposed on the top of the circuit layer, adopts the methods of top heat dissipation and integrating multiple inverter circuits into one circuit layer. On the premise of unchanged functions, the number of pads and the total area of the circuit board are reduced, and the processing of heat dissipation through holes on the PCB board is avoided, thereby reducing the total weight and processing cost of the circuit board.
[0032] As Figure 3 shown, Figure 3 is a circuit diagram of a photovoltaic inverter battery protection circuit board provided by an embodiment of the present application. Among them, U + is the positive electrode of the DC power input terminal, and U - is the negative electrode of the DC power input terminal. It can be seen from Figure 3 that DC power enters the photovoltaic inverter battery protection circuit board from the DC power input terminal. After the DC power is filtered by a filter capacitor 7 (the introduction of the filter capacitor 7 is described later) to stabilize the voltage, the DC power is input to the inverter circuit module 2 and converted into alternating current. The alternating current passes through the AC power output terminal ( Figure 3Output is carried out through the AC output terminal (not shown in the figure). Among them, the control chip 6 (for the introduction of the control chip 6, see the following text) outputs a PWM (Pulse Width Modulation) signal to the inverter circuit module 2 to adjust the duty cycle of the switching tubes in the circuit layer 3, thereby controlling the operation of the inverter circuit module 2 so that the direct current is converted into alternating current after passing through the inverter circuit module 2.
[0033] Specifically, the inverter circuit in the inverter circuit module 2 is a half-bridge inverter circuit, a single-phase full-bridge inverter circuit or a three-phase bridge inverter circuit;
[0034] In specific applications, the inverter circuit in the inverter circuit module 2 can be set as a half-bridge inverter circuit, a single-phase full-bridge inverter circuit or a three-phase bridge inverter circuit. Through the inverter circuit module 2, the direct current is converted into alternating current.
[0035] Specifically, the circuit layer 3 is provided with a plurality of switching tubes; the plurality of switching tubes are electrically connected to each other (thereby forming a bridge inverter circuit).
[0036] In specific applications, according to the type of the inverter circuit in the inverter circuit module 2, different numbers of switching tubes are provided in the circuit layer 3. When the inverter circuit in the inverter circuit module 2 is a half-bridge inverter circuit, two or four switching tubes are provided, and the specific number is determined according to the type of the switching tubes; when the inverter circuit in the inverter circuit module 2 is a single-phase full-bridge inverter circuit, four switching tubes are provided; when the inverter circuit in the inverter circuit module 2 is a three-phase bridge inverter circuit, six switching tubes are provided.
[0037] Integrating a plurality of switching tubes into the circuit layer 3 can reduce the occupied area of the inverter circuit module 2 on the PCB board 1, can adjust the layout of the photovoltaic inverter battery protection circuit board, reduce the number and area of the pads on the PCB board 1 on the premise of unchanged functions, and at the same time reduce the weight of the PCB board 1. Moreover, the heat dissipation layer 4 can be directly provided on the top of the circuit layer 3 to dissipate the heat of the circuit layer 3 into the air.
[0038] Specifically, the switching tube can be but is not limited to an MOSFET tube, an IGBT tube, a BJT tube or a thyristor.
[0039] In specific applications, the switching tube can be set as an MOSFET tube, an IGBT tube, a BJT tube or a thyristor. When the inverter circuit module 2 is a half-bridge inverter circuit: 1) If a BJT tube or a thyristor is used as the switching tube, four switching tubes need to be provided; 2) If an MOSFET tube or an IGBT tube is used as the switching tube, two switching tubes need to be provided.
[0040] Among them, the circuit structures of the half-bridge inverter circuit, the single-phase full-bridge inverter circuit and the three-phase bridge inverter circuit are prior arts. For example, taking the three-phase bridge inverter circuit as an example, asFigure 4 As shown Figure 4 Figure 4 This is a circuit diagram of the circuit layer of a photovoltaic inverter battery protection circuit board provided by an embodiment of the present application. Among them, V1, V2, V3, V4, V5, and V6 are switching tubes, and S1A, S1B, S1C, S2A, S2B, S2C, S3A, S3B, S3C, G1, G2, G3, G4, G5, and G6 are interfaces. Among them, interface S1A, interface S1B, and interface S1C are the positive input interfaces, and interface S1A, interface S1B, and interface S1C are all connected to the positive pole of the DC input terminal; interface S2A, interface S2B, and interface S2C are the negative input interfaces, and interface S2A, interface S2B, and interface S2C are all connected to the negative pole of the DC input terminal; interface S3A, interface S3B, and interface S3C are the output interfaces, and interface S3A, interface S3B, and interface S3C are all connected to the AC output terminal; interface G1, interface G2, interface G3, interface G4, interface G5, and interface G6 are adjustment interfaces, and interface G1, interface G2, interface G3, interface G4, interface G5, and interface G6 are all connected to the control chip 6; the control chip 6 respectively inputs PWM to the switching tubes V1, V2, V3, V4, V5, and V6 through the interfaces G1, G2, G3, G4, G5, and G6 to respectively control the duty cycles of the switching tubes V1, V2, V3, V4, V5, and V6, so as to control the inverter circuit module 2 to convert DC power into AC power.
[0041] Specifically, a heat-conducting insulating layer 5 is provided between the circuit layer 3 and the heat-dissipating layer 4;
[0042] The heat-conducting insulating layer 5 is used to conduct the heat of the circuit layer 3 into the heat-dissipating layer 4.
[0043] In specific applications, the heat-conducting insulating layer 5 (i.e., heat-dissipating paste) is a heat-conducting silicone grease-like composite made of silicone ketone as the main raw material and adding materials with excellent heat resistance and heat conductivity, and is used to conduct the heat of the circuit layer 3 into the heat-dissipating layer 4, so as to ensure the stability of the electrical performance of the photovoltaic inverter battery protection circuit board. Among them, the heat-dissipating layer 4 can be but is not limited to a heat sink.
[0044] Specifically, the inverter circuit module 2 is a rectangular module, the long side of the inverter circuit module 2 is not greater than 25 mm, and the short side of the inverter circuit module 2 is not greater than 20 mm.
[0045] In specific applications, the inverter circuit module 2 is a rectangular module, the long side (i.e., the length) of the inverter circuit module 2 is not greater than 25 mm, the short side (i.e., the width) of the inverter circuit module 2 is not greater than 20 mm, and the area of the inverter circuit module 2 is not greater than 500 mm 2, compared with traditional photovoltaic inverter circuit boards (the occupied area of multiple MOS transistors on traditional photovoltaic inverter circuit boards is approximately 2000 mm 2 ), a large amount of occupied area is reduced. At the same time, the total area of PCB board 1 is also reduced, the weight of PCB board 1 is lightened, and the production materials are reduced, thereby reducing the processing cost.
[0046] Specifically, the inverter circuit further includes a control chip 6 disposed on PCB board 1, and the control chip 6 is electrically connected to the inverter circuit module 2.
[0047] In specific applications, the control chip 6 outputs a PWM (pulse width modulation) signal to the inverter circuit module 2 to adjust the duty cycle of the switching tubes in the circuit layer 3, thereby controlling the operation of the inverter circuit module 2 so that direct current is converted into alternating current after passing through the inverter circuit module 2.
[0048] Specifically, the inverter circuit further includes a filter capacitor 7 disposed on PCB board 1; the filter capacitor 7 is connected in parallel with the inverter circuit module 2 between the positive and negative electrodes of the direct current input terminal.
[0049] In specific applications, the filter capacitor 7 is used to filter the direct current to stabilize the voltage of the direct current. Among them, the filter capacitor 7 can be provided with at least one capacitor, and the specific number can be set according to actual needs.
[0050] As Figure 5 shown, Figure 5 is a circuit diagram of a photovoltaic inverter provided by an embodiment of the present application. Among them, the photovoltaic inverter includes the above-mentioned photovoltaic inverter battery protection circuit board. Among them, U + is the positive electrode of the direct current input terminal, U - is the negative electrode of the direct current input terminal. When direct current enters the photovoltaic inverter battery protection circuit board from the direct current input terminal and the voltage is stabilized after being filtered by the filter capacitor 7, the stabilized direct current will first be input into the battery 8 for storage. Until the direct current stored in the battery 8 reaches the maximum capacity, the stabilized direct current will be input into the inverter circuit module 2 and converted into alternating current. The alternating current is output through the alternating current output terminal ( Figure 5 the alternating current output terminal is not drawn in the figure) and output to the power grid 11 and / or the load 12.
[0051] As Figure 6 shown, Figure 6A circuit diagram of a photovoltaic system provided by an embodiment of the present application. Among them, the photovoltaic system includes the photovoltaic inverter, battery 8, bidirectional DC / DC circuit 9, and photovoltaic array 10 described above. The photovoltaic array 10 is electrically connected to the photovoltaic inverter, the battery 8 and the bidirectional DC / DC circuit 9 are electrically connected, and the bidirectional DC / DC circuit 9 is connected in parallel with the input end of the inverter circuit module 2. Specifically, the bidirectional DC / DC circuit 9 is connected between the filter capacitor 7 of the photovoltaic inverter and the inverter circuit module 2. Among them, the battery 8 is used to store the direct current input from the direct current input end, the bidirectional DC / DC circuit 9 is used to increase the voltage of the direct current, and the photovoltaic array 10 is used to absorb solar energy and convert it into direct current. The photovoltaic array 10 converts the absorbed solar energy into direct current. The direct current enters the battery protection circuit board of the photovoltaic inverter from the direct current input end. After the filter capacitor 7 filters the direct current to stabilize the voltage, the stabilized direct current will first be input into the battery 8 for storage. Until the direct current stored in the battery 8 reaches the maximum capacity, the stabilized direct current will be input into the inverter circuit module 2 and converted into alternating current. The alternating current is output to the power grid 11 and / or load 12 through the alternating current output end ( Figure 6 The alternating current output end is not drawn in the figure) and output to the power grid 11 and / or load 12. When the output voltage of the photovoltaic inverter at the alternating current output end is unstable or the required power of the load 12 is in short supply (for example, in the case of rainy days, the photovoltaic array does not absorb enough solar energy to make the direct current converted from solar energy unable to meet the required power of the load 12), the battery 8 can release the stored direct current to balance the power distribution of the load 12, so as to achieve the effect of optimizing the power output.
[0052] Through this technical solution, the inverter circuit module composed of a circuit layer integrated with an inverter circuit and a heat dissipation layer provided on the top of the circuit layer adopts the methods of top heat dissipation and integrating multiple inverter circuits into one circuit layer. On the premise of unchanged functions, the number and total area of the pads on the circuit board are reduced, and the processing of heat dissipation through holes on the PCB board is avoided, thereby reducing the total weight and processing cost of the circuit board.
[0053] In the description of this specification, the description with reference to terms such as "one embodiment", "certain embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.
[0054] The above are only some embodiments of the present utility model. For those of ordinary skill in the art, without departing from the inventive concept of the present utility model, several modifications and improvements can still be made, and these all fall within the protection scope of the present utility model.
Claims
1. A photovoltaic inverter battery protection circuit board, comprising a PCB board (1) and an inverter circuit arranged on the PCB board (1), the inverter circuit comprising a direct current input terminal for connecting to a photovoltaic array (10), an inverter circuit module (2) and an alternating current output terminal for outputting alternating current, characterized in that: The inverter circuit module (2) comprises a circuit layer (3) integrated with an inverter circuit and a heat dissipation layer (4) arranged on top of the circuit layer (3).
2. The photovoltaic inverter battery protection circuit board according to claim 1, characterized in that: The inverter circuit in the inverter circuit module (2) is a half-bridge inverter circuit, a single-phase full-bridge inverter circuit or a three-phase bridge inverter circuit.
3. The photovoltaic inverter battery protection circuit board according to claim 1, characterized in that: The circuit layer (3) is provided with a plurality of switch tubes; the plurality of switch tubes are electrically connected to each other.
4. The photovoltaic inverter battery protection circuit board according to claim 3, characterized in that: The switch tube is a MOSFET tube, an IGBT tube, a BJT tube or a thyristor.
5. The photovoltaic inverter battery protection circuit board according to claim 1, characterized in that: A heat-conducting insulating layer (5) is provided between the circuit layer (3) and the heat dissipation layer (4); The heat-conducting insulating layer (5) is used to conduct the heat of the circuit layer (3) to the heat dissipation layer (4).
6. The photovoltaic inverter battery protection circuit board according to claim 1, characterized in that: The inverter circuit module (2) is a rectangular module, the long side of the inverter circuit module (2) is no larger than 25 mm, and the short side of the inverter circuit module (2) is no larger than 20 mm.
7. The photovoltaic inverter battery protection circuit board according to claim 1, characterized in that: The inverter circuit further comprises a control chip (6) arranged on the PCB board (1), and the control chip (6) is electrically connected to the inverter circuit module (2).
8. The photovoltaic inverter battery protection circuit board according to claim 1, characterized in that: The inverter circuit further comprises a filter capacitor (7) arranged on the PCB board (1), wherein the filter capacitor (7) and the inverter circuit module (2) are connected in parallel between the positive electrode and the negative electrode of the direct current input terminal.
9. A photovoltaic inverter, characterized in that: A photovoltaic inverter battery protection circuit board comprising any one of claims 1 to 8.
10. A photovoltaic system, characterized in that: The invention comprises the photovoltaic inverter as claimed in claim 9, a battery (8), a bidirectional DC / DC circuit (9) and a photovoltaic array (10), wherein the photovoltaic array (10) is electrically connected to the photovoltaic inverter, the battery (8) is electrically connected to the bidirectional DC / DC circuit (9), and the bidirectional DC / DC circuit (9) is connected in parallel to the input end of the inverter circuit module (2).