Integral capacitor module applied to photovoltaic inverter

Abstract

The utility model discloses an integral capacitor module applied to a photovoltaic inverter, which comprises a substrate and a capacitor module composed of a plurality of aluminum electrolytic capacitors, the plurality of aluminum electrolytic capacitors are uniformly distributed on the substrate, and the adjacent aluminum electrolytic capacitors are closely and continuously arranged and reasonably arranged to realize compact connection. The temperature sensor is arranged on the substrate and is connected to the temperature protection circuit, so that a temperature protection effect is achieved, and safe operation of the capacitor module is ensured. An integral capacitor module is adopted, the layout is optimized, and the integration level and the space utilization rate of the photovoltaic inverter are improved; the internal heat dissipation performance of the inverter is optimized, and the service life of the capacitor and the whole machine is prolonged.

Description

Technical Field

[0001] The utility model relates to a capacitor module, in particular to an integral capacitor module applied to a photovoltaic inverter. Background Art

[0002] As a key device for converting the direct current generated by photovoltaic panels into alternating current, a photovoltaic inverter contains numerous electronic components inside, especially large-capacity capacitors, which play an important role in energy storage filtering and stabilizing the bus voltage at the DC bus. However, the capacitor layout in existing photovoltaic inverters is often rather messy, not only increasing the wiring complexity, but also affecting the overall heat dissipation performance and maintenance efficiency of the inverter. In addition, the independent installation of capacitors also increases the failure points and the difficulty of replacement.

[0003] Ordinary electrolytic capacitors are large in volume and weight. Due to the difficulty in capacitor layout on the circuit board caused by the space limitation inside the inverter and the resulting heat dissipation problems, urgent solutions are needed. Summary of the Invention

[0004] To solve the problems of difficult capacitor layout on the circuit board and heat dissipation, the utility model needs to provide an integral capacitor module applied to a photovoltaic inverter to optimize the layout and facilitate heat dissipation.

[0005] The utility model provides the following technical solutions:

[0006] An integral capacitor module applied to a photovoltaic inverter, comprising a substrate and a capacitor module composed of a plurality of aluminum electrolytic capacitors. The plurality of aluminum electrolytic capacitors are evenly distributed on the substrate, and adjacent aluminum electrolytic capacitors are arranged closely and continuously. A temperature sensor is arranged on the substrate and connected to a temperature protection circuit.

[0007] Further, the capacitor module includes a resistor group, a first capacitor group, a second capacitor group, a third capacitor group, and a fourth capacitor group, and the resistor group, the first capacitor group, the second capacitor group, the third capacitor group, and the fourth capacitor group are connected in parallel.

[0008] Further, the resistor group is composed of a resistor R1 and a resistor R2 connected, the first capacitor group is composed of a capacitor C1 and a capacitor C14 connected, the second capacitor group is composed of a capacitor C2 and a capacitor C15 connected, the third capacitor group is composed of a capacitor C7 and a capacitor C16 connected, and the fourth capacitor group is composed of a capacitor C8 and a capacitor C18 connected.

[0009] Further, the substrate is made of an aluminum substrate or a ceramic substrate.

[0010] Further, the temperature protection circuit includes a differential comparator U2A, a potentiometer R2, a triode Q1A and various resistors. The negative input terminal of the differential comparator U2A is connected to the resistor R1 and the potentiometer R2. The positive input terminal of the differential comparator U2A is connected to the resistor R1 and the temperature sensor. The output terminal of the differential comparator U2A is connected to the triode Q1A through the resistor R3. The collector of the triode Q1A is connected to the interface J1, and the interface J1 is used to connect the cooling fan.

[0011] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0012] 1. By adopting an integral capacitor module, the layout is optimized, and the integration degree and space utilization rate of the photovoltaic inverter are improved;

[0013] 2. The internal heat dissipation performance of the inverter is optimized, and the service life of the capacitor and the whole machine is prolonged;

[0014] 3. The operation stability and reliability of the photovoltaic inverter are improved, and the system failure rate is reduced;

[0015] 4. The maintenance process is simplified, and the maintenance cost and time are reduced. Description of the Drawings

[0016] Figure 1 It is a schematic structural diagram of the present utility model.

[0017] Figure 2 It is a circuit diagram of the capacitor module of the present utility model.

[0018] Figure 3 It is a circuit diagram of the temperature protection circuit of the present utility model.

[0019] Figure 4 It is a relationship diagram of the capacitor module and the temperature protection circuit of the present utility model.

[0020] 1. Substrate; 2. Aluminum electrolytic capacitor; 3. Temperature sensor. Embodiment

[0021] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0022] Please refer to Figure 1, An integral capacitor module applied to a photovoltaic inverter of the present utility model includes a substrate and a capacitor module composed of a plurality of aluminum electrolytic capacitors 2. The plurality of aluminum electrolytic capacitors 1 are evenly distributed on the substrate 2, and the adjacent aluminum electrolytic capacitors are arranged closely and continuously, with a reasonable layout to achieve a compact connection.

[0023] Figure 2 As shown, the capacitor module includes capacitor C1, capacitor C2, capacitor C7, capacitor C8, capacitor C14, capacitor C15, capacitor C16, capacitor C18, resistor R1 and resistor R2. Resistor R1 and resistor R2 are connected to form a resistor group. Capacitor C1 and capacitor C14 are connected to form a first capacitor group. Capacitor C2 and capacitor C15 are connected to form a second capacitor group. Capacitor C7 and capacitor C16 are connected to form a third capacitor group. Capacitor C8 and capacitor C18 are connected to form a fourth capacitor group.

[0024] The resistor group, the first capacitor group, the second capacitor group, the third capacitor group, and the fourth capacitor group are connected in parallel.

[0025] The substrate is made of a material with high thermal conductivity (aluminum substrate or ceramic substrate) to facilitate heat dissipation. The plurality of aluminum electrolytic capacitors are evenly distributed on the substrate, and a compact design is achieved through an optimized layout and connection method.

[0026] A temperature sensor 3 is arranged on the substrate and connected to a temperature protection circuit, which has a temperature protection function to ensure the safe operation of the capacitor module.

[0027] Figure 3 As shown, the temperature protection circuit includes a differential comparator U2A, a potentiometer R2, a triode Q1A and various resistors. The negative input terminal of the differential comparator U2A is connected to resistor R1 and potentiometer R2. The positive input terminal of the differential comparator U2A is connected to resistor R1 and the temperature sensor. The output terminal of the differential comparator U2A is connected to the triode Q1A through resistor R3. The collector of the triode Q1A is connected to interface J1, and interface J1 is used to connect a cooling fan.

[0028] The temperature sensor is a thermistor RT, which is placed at the center position of the substrate and connected to the temperature protection circuit through a lead.

[0029] Figure 4 As shown, the temperature protection circuit is used to prevent the capacitor from overheating. The thermistor sets the temperature critical point according to requirements through resistor R1 and resistor R2. When the temperature does not reach the critical point, the differential comparator outputs a low level and the cooling fan does not start. When the critical point is reached, the differential comparator outputs a high level to start the cooling fan.

[0030] The capacitor module measures the temperature through the thermistor and feeds it back to the temperature protection circuit. The temperature protection circuit starts the cooling fan according to the conditions to cool down the capacitor module.

[0031] According to the actual requirements of the photovoltaic inverter, select large-capacity capacitors with appropriate capacity and withstand voltage levels, such as aluminum electrolytic capacitors or thin-film capacitors, and arrange them on the circuit board according to the principle of optimized layout; adopt circuit board materials with high precision and high thermal conductivity, design reasonable circuit traces and heat dissipation structures to ensure the efficient operation and stable heat dissipation of the capacitor module.

[0032] Modular integration: Directly integrate the designed capacitor module into the corresponding position of the photovoltaic inverter, and connect it to the inverter main board through a standard interface to achieve quick installation and disassembly.

[0033] The utility model adopts an integral capacitor module, optimizes the layout, improves the integration degree and space utilization rate of the photovoltaic inverter; optimizes the internal heat dissipation performance of the inverter, extends the service life of the capacitor and the whole machine; improves the operation stability and reliability of the photovoltaic inverter, reduces the system failure rate; simplifies the maintenance process, and reduces the maintenance cost and time.

[0034] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. An integrated capacitor module applied to a photovoltaic inverter, characterized in that: A capacitor module comprising a substrate and a plurality of aluminum electrolytic capacitors, the plurality of aluminum electrolytic capacitors are evenly distributed on the substrate, adjacent aluminum electrolytic capacitors are arranged closely and continuously, a temperature sensor is arranged on the substrate and connected to a temperature protection circuit; the capacitor module includes a resistor group, a first capacitor group, a second capacitor group, a third capacitor group, and a fourth capacitor group, and the resistor group, the first capacitor group, the second capacitor group, the third capacitor group, and the fourth capacitor group are connected in parallel; the temperature protection circuit includes a differential comparator U2A, a potentiometer R2, a triode Q1A and various resistors, the negative input terminal of the differential comparator U2A is connected to the resistor R1 and the potentiometer R2, the positive input terminal of the differential comparator U2A is connected to the resistor R1 and the temperature sensor, the output terminal of the differential comparator U2A is connected to the triode Q1A through the resistor R3, the collector of the triode Q1A is connected to the interface J1, and the interface J1 is used to connect a cooling fan.

2. The integrated capacitor module applied to a photovoltaic inverter according to claim 1, wherein: The resistor group is composed of the resistor R1 and the resistor R2 connected, the first capacitor group is composed of the capacitor C1 and the capacitor C14 connected, the second capacitor group is composed of the capacitor C2 and the capacitor C15 connected, the third capacitor group is composed of the capacitor C7 and the capacitor C16 connected, and the fourth capacitor group is composed of the capacitor C8 and the capacitor C18 connected.

3. An integrated capacitor module applied to a photovoltaic inverter according to claim 1, characterized in that: The substrate is made of an aluminum substrate or a ceramic substrate.

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