Lightning protection circuit, electronic equipment and photovoltaic system

Abstract

The utility model provides a lightning protection circuit, electronic equipment and a photovoltaic system, and relates to the technical field of power electronics. The lightning protection circuit comprises a first capacitor and a first lightning protection module, one end of the first lightning protection module is connected with one end of the first capacitor, the other end of the first lightning protection module is grounded, and one end, far away from the first lightning protection module, of the first capacitor is connected with a to-be-protected DC circuit. Under the characteristic action of DC blocking and AC circulation of the first capacitor, the to-be-protected DC circuit can work normally without lightning stroke, and the first capacitor is conducted to protect the to-be-protected DC circuit through voltage relief when the to-be-protected DC circuit is subjected to lightning stroke and AC exists. According to the arrangement mode, the specification requirement of the first lightning protection module can be reduced, the lightning protection function of the first capacitor can be triggered more easily, the residual voltage after voltage relief is reduced, the damage risk of components on the to-be-protected direct current circuit and a post-stage circuit is reduced, and a better lightning protection effect can be achieved on the to-be-protected direct current circuit.

Description

Technical Field

[0001] The utility model relates to the technical field of power electronics, and in particular to a lightning protection circuit, electronic equipment and a photovoltaic system. Background Art

[0002] In electronic power technology, in order to protect electronic equipment from damage caused by lightning strikes, lightning protection circuits are usually equipped. The lightning protection circuits are equipped with lightning protection modules. When lightning strikes and causes overvoltage in the circuit, the lightning protection module is turned on, and the lightning protection circuit provides a low-impedance path to guide the surge current to the ground for pressure relief, thereby protecting other electronic components.

[0003] However, in this case, it is necessary to ensure that the lightning protection circuit is not conductive when the electronic equipment is in normal use. The specifications of lightning protection modules, such as overvoltage protection elements, are large. Specifically, the rated voltage of the lightning protection circuit is large, which is not conducive to the rapid triggering of the lightning protection circuit when a lightning strike occurs. Residual pressure is prone to occur in the pressure relief process of the lightning protection circuit, which affects the performance of the components in the protected circuit, such as service life, and affects the protection effect of lightning strikes. Utility Model Content

[0004] The utility model aims to solve the problem of how to improve the performance of lightning protection circuits in the related art to a certain extent.

[0005] In order to at least solve at least one aspect of the above-mentioned problems to a certain extent, in a first aspect, the utility model provides a lightning protection circuit, which includes a first capacitor and a first lightning protection module, one end of the first lightning protection module is connected to one end of the first capacitor, the other end of the first lightning protection module is used for grounding, and one end of the first capacitor away from the first lightning protection module is used for connection to a DC circuit to be protected.

[0006] Optionally, the lightning protection circuit includes two first capacitors, the two first capacitors are arranged in series, the ends of the two first capacitors facing away from each other are respectively connected to the positive and negative electrodes of the DC circuit to be protected, and the first lightning protection module is respectively connected to the two first capacitors between the two first capacitors.

[0007] Optionally, the lightning protection circuit includes two first capacitors and two first lightning protection modules, one end of one first capacitor and one first lightning protection module are connected to the positive electrode of the DC circuit to be protected, and the other end is grounded, and another end of another first capacitor and another first lightning protection module are connected to the negative electrode of the DC circuit to be protected, and the other end is grounded.

[0008] Optionally, the first lightning protection module includes an overvoltage protection element.

[0009] Optionally, the overvoltage protection element includes at least one of a varistor and a gas discharge tube.

[0010] Optionally, the first capacitor is a film capacitor.

[0011] In a second aspect, the utility model provides an electronic device, comprising a DC circuit to be protected and a lightning protection circuit as described in the first aspect above, wherein the lightning protection circuit is connected to the DC circuit to be protected via a first capacitor.

[0012] Optionally, the electronic device further includes an inverter module, and a DC side of the inverter module is connected to the DC circuit to be protected.

[0013] Optionally, the electronic device further includes an AC branch and an AC lightning protection circuit, the AC side of the inverter module is connected to the AC branch, and the AC branch is correspondingly provided with the AC lightning protection circuit.

[0014] Optionally, the DC circuit to be protected includes a photovoltaic module and a battery;

[0015] Among them, a photovoltaic lightning protection branch is correspondingly arranged between the two output ends of the photovoltaic component, and the photovoltaic lightning protection branch is the lightning protection branch; or, a photovoltaic lightning protection branch is correspondingly arranged between the two output ends of the photovoltaic component, and a battery lightning protection circuit is correspondingly arranged between the two output ends of the battery, and at least one of the photovoltaic lightning protection branch and the battery lightning protection circuit is the lightning protection branch.

[0016] Optionally, when a photovoltaic lightning protection branch is correspondingly arranged between the two output ends of the photovoltaic component, and a battery lightning protection circuit is correspondingly arranged between the two output ends of the battery, the DC circuit to be protected also includes a DC bus, the photovoltaic component is connected to the inverter module through the DC bus, the battery is charged from the DC bus through the step-down branch, and discharged to the DC bus through the step-up branch, and the rated voltage of the battery lightning protection circuit is lower than the rated voltage of the photovoltaic lightning protection branch.

[0017] In a third aspect, the utility model provides a photovoltaic system, comprising the electronic device as described in the second aspect above.

[0018] Compared with the relevant prior art, in the lightning protection circuit, electronic equipment and photovoltaic system of the utility model, when the lightning protection circuit is connected to the DC circuit to be protected, it is connected to the DC circuit to be protected through the first capacitor and is grounded through the first capacitor. That is to say, the lightning protection circuit corresponds to the DC circuit to be protected. The lightning protection pressure relief path formed by the lightning protection circuit is equipped with a first capacitor and a first lightning protection module. Due to the characteristic of the first capacitor to isolate DC and pass AC, when not struck by lightning, the first capacitor disconnects the lightning protection pressure relief path, and the DC circuit to be protected can work normally. When struck by lightning and there is AC current, the first capacitor is turned on. When the voltage is greater than the rated voltage of the first lightning protection module, the first lightning protection module is turned on to protect the DC circuit to be protected by pressure relief. This setting method can reduce the specification requirements of the first lightning protection module and make it easier to trigger the lightning protection function of the first capacitor. Specifically, it can reduce the rated voltage requirement of the first lightning protection module, so that when the DC circuit to be protected is struck by lightning and generates a surge current, pressure relief can be started through the lightning protection pressure relief path of the lightning protection circuit. It can also extend the pressure relief time, reduce the residual pressure after pressure relief, and reduce the risk of damage to components in the DC circuit to be protected and the subsequent circuits, so as to achieve better lightning protection for the DC circuit to be protected. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of the lightning protection circuit in the first solution of the utility model;

[0020] Figure 2 This is a schematic diagram of the structure of the lightning protection circuit in the second solution of the utility model;

[0021] Figure 3 It is a structural schematic diagram of a lightning protection circuit corresponding to a DC bus of an electronic device in an embodiment of the utility model;

[0022] Figure 4 This is a schematic structural diagram of an electronic device including a battery in another embodiment of the present invention.

[0023] Description of reference numerals:

[0024] 10-lightning protection circuit; 11-first capacitor; 12-first lightning protection module; 20-DC circuit to be protected; 21-DC bus; 30-inverter module; 40-AC branch; 41-AC output module; 50-AC lightning protection circuit; 51-second lightning protection module; 60-battery; 70-battery lightning protection circuit; 71-third lightning protection module; 80-bus capacitor; 90-photovoltaic module. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] In the description of this specification, the description with reference to the terms "embodiment", "one embodiment", "some embodiments", "exemplarily" and "one embodiment" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or embodiment are included in at least one embodiment or embodiment of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or embodiment. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or embodiments in a suitable manner. The description of "end" in this specification generally refers to the power connection end of the corresponding component, which will not be described in detail later.

[0028] The terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0029] like Figure 1 and Figure 2 As shown, a lightning protection circuit 10 is provided in an embodiment of the utility model, and the lightning protection circuit 10 includes a first capacitor 11 and a first lightning protection module 12, one end of the first lightning protection module 12 is connected to one end of the first capacitor 11, the other end of the first lightning protection module 12 is used for grounding, and the end of the first capacitor 11 away from the first lightning protection module 12 is used for connection to the DC circuit 20 to be protected.

[0030] The first lightning protection module 12 can be used in related technologies, which will be described in an exemplary manner later. The specific layout and application field of the DC circuit 20 to be protected are not limited without violating the design concept of the present utility model, which will be described in an exemplary manner later.

[0031] In this embodiment, when the lightning protection circuit 10 is connected to the DC circuit 20 to be protected, it is connected to the DC circuit 20 to be protected through the first capacitor 11 and is grounded through the first capacitor 11. That is to say, the lightning protection pressure relief path formed by the lightning protection circuit 10 corresponding to the DC circuit 20 to be protected is equipped with the first capacitor 11 and the first lightning protection module 12. Due to the characteristic of the first capacitor 11 to isolate DC and pass AC, when not struck by lightning, the first capacitor 11 disconnects the lightning protection pressure relief path, and the DC circuit 20 to be protected can work normally. When struck by lightning and there is AC current, the first capacitor 11 is turned on. When the voltage is greater than the rated voltage of the first lightning protection module 12 (the rated voltage is the maximum voltage effective value that can be applied to the first lightning protection module 12 for a long time without causing changes in its characteristics and activating the protection function), the first lightning protection module 12 is turned on to protect the DC circuit 20 to be protected by pressure relief. This arrangement can reduce the specification requirements of the first lightning protection module 12 and make it easier to trigger the lightning protection function of the first capacitor 11. Specifically, the rated voltage requirement of the first lightning protection module 12 can be reduced, so that pressure relief can be started through the lightning protection pressure relief path of the lightning protection circuit 10 at the initial stage when the DC circuit 20 to be protected is struck by lightning and generates a surge current. The pressure relief time can also be extended to reduce the residual pressure after pressure relief, thereby reducing the risk of damage to components in the DC circuit 20 to be protected and the subsequent circuits, and better lightning protection can be achieved for the DC circuit 20 to be protected.

[0032] The DC circuit 20 to be protected usually has a positive pole and a negative pole, and the lightning protection circuit 10 can be used to protect the positive pole and the negative pole of the DC circuit 20 to be protected. At this time, after the lightning protection circuit 10 is connected to the DC circuit 20 to be protected, two lightning protection pressure relief paths are formed, one of which is used for lightning protection pressure relief of the positive pole of the DC circuit 20 to be protected, and the other lightning protection pressure relief path is used for lightning protection pressure relief of the negative pole of the DC circuit 20 to be protected. The lightning protection circuit 10 can provide more comprehensive lightning protection for the DC circuit 20 to be protected.

[0033] like Figure 1 As shown, in optional scheme 1 of the lightning protection circuit 10, the lightning protection circuit 10 includes two first capacitors 11, the two first capacitors 11 are arranged in series, and the ends of the two first capacitors 11 that are opposite to each other are respectively connected to the positive and negative electrodes of the DC circuit 20 to be protected, and the first lightning protection module 12 is respectively connected to the two first capacitors 11 between the two first capacitors 11.

[0034] Specifically, the first lightning protection module 12 is electrically connected to the two first capacitors 11 at adjacent ends of the two first capacitors 11, and the ends of the two first capacitors 11 facing away from the first lightning protection module 12 are respectively connected to the positive electrode and the negative electrode of the DC circuit 20 to be protected.

[0035] In this embodiment, the lightning protection circuit 10 uses two first capacitors 11 and a first lightning protection module 12 to form two lightning protection pressure relief paths, respectively protecting the positive and negative electrodes of the DC circuit 20 to be protected. Specifically, the positive electrode of the DC circuit 20 to be protected is grounded through one of the two first capacitors 11 and the first lightning protection module 12, forming a lightning protection pressure relief path for the positive electrode of the DC circuit 20 to be protected, and the negative electrode of the DC circuit 20 to be protected is grounded through the other of the two first capacitors 11 and the first lightning protection module 12, forming a lightning protection pressure relief path for the negative electrode of the DC circuit 20 to be protected. The two lightning protection pressure relief paths share a first lightning protection module 12, and a relatively comprehensive lightning protection for the DC circuit 20 to be protected can be formed by using fewer components, with a simple structure and strong practicality. In addition, at this time, since the two first capacitors 11 are connected in series, the two ends are connected to the positive and negative electrodes of the DC circuit 20 to be protected, respectively, and the DC circuit 20 to be protected can obtain a smooth DC voltage to a certain extent (when the lightning protection circuit 10 is used for an inverter, the first capacitor 11 can be used as an input capacitor of the inverter).

[0036] like Figure 2 As shown, in optional scheme 2 of the lightning protection circuit 10, the lightning protection circuit 10 includes two first capacitors 11 and two first lightning protection modules 12. After one first capacitor 11 and a first lightning protection module 12 are connected, one end is connected to the positive pole of the DC circuit 20 to be protected, and the other end is grounded. After another first capacitor 11 and another first lightning protection module 12 are connected, one end is connected to the negative pole of the DC circuit 20 to be protected, and the other end is grounded.

[0037] Specifically, at this time, the positive electrode and the negative electrode of the DC circuit 20 to be protected are respectively equipped with the first capacitor 11 and the first lightning protection module 12, and the lightning protection pressure relief path corresponding to the positive electrode of the DC circuit 20 to be protected and the lightning protection pressure relief path corresponding to the negative electrode of the DC circuit 20 to be protected do not interfere with each other. It can also obtain more comprehensive lightning protection for the DC circuit 20 to be protected.

[0038] In the above embodiment, optionally, the first lightning protection module 12 includes an overvoltage protection element.

[0039] In this way, when an overvoltage occurs in the system, the overvoltage protection element can respond quickly to avoid transmitting excessive voltage to the DC circuit 20 to be protected, thereby protecting the DC circuit 20 to be protected from damage. The overvoltage protection element can also limit the voltage rise to ensure that it is within the set range to avoid the DC circuit 20 to be protected from damage due to sudden voltage fluctuations. The overvoltage protection element has a fast response speed and can respond quickly to overvoltage events to protect the equipment from sudden situations such as lightning strikes. The overvoltage protection element can improve the stability and reliability of the DC circuit 20 to be protected and extend the service life of components on the DC circuit 20 to be protected.

[0040] Optionally, the overvoltage protection element includes at least one of a varistor and a gas discharge tube.

[0041] Both the varistor and the gas discharge tube have the characteristics of fast response, high sensitivity, strong energy absorption capacity, good reliability and low cost, and can effectively protect the DC circuit 20 to be protected from the hazards of lightning strikes and overvoltage.

[0042] When the voltage protection element includes multiple varistors and gas discharge tubes, the multiple elements can be directly arranged using relevant technologies, for example, they can be arranged in series, which is not a limitation and will not be described in detail here.

[0043] In an optional solution of the first capacitor 11, the first capacitor 11 is a film capacitor.

[0044] Film capacitors have the characteristics of fast response. In the case of sudden overvoltage such as lightning, film capacitors can start quickly and absorb the energy of overvoltage. When the temperature, frequency and humidity of film capacitors change, the capacitance value changes relatively little, and has good stability. This allows film capacitors to maintain consistent performance under long-term use and various environmental conditions. Film capacitors usually have lower losses, so that the lightning protection circuit 10 can minimize energy loss while protecting the DC circuit 20 to be protected. Film capacitors are smaller in size than other types of capacitors, which can reduce the space occupied by the lightning protection circuit 10, facilitate integrated design of the lightning protection circuit 10 and the DC circuit 20 to be protected, and reduce the overall size. Film capacitors have good high temperature resistance and can ensure the working performance of the lightning protection circuit 10 under harsh environmental conditions.

[0045] Of course, it should be understood that in other optional solutions, the first capacitor 11 may also be other capacitors, such as a ceramic capacitor, an aluminum electrolytic capacitor, a solid electrolytic capacitor, etc. No detailed description is given here.

[0046] like Figure 3 As shown, another embodiment of the utility model provides an electronic device, which includes a DC circuit 20 to be protected and a lightning protection circuit 10 as described in the above embodiment, wherein the lightning protection circuit 10 is connected to the DC circuit 20 to be protected via its first capacitor 11.

[0047] In this way, the DC circuit of the electronic device can be protected against lightning by the lightning protection circuit 10 , which is beneficial to improving the reliability and service life of the components of the lightning protection circuit 10 .

[0048] like Figure 3 As shown, optionally, the electronic device further includes an inverter module 30 , and a DC side of the inverter module 30 is connected to the DC circuit 20 to be protected.

[0049] The electronic device may be a converter such as an inverter. Exemplarily, the DC circuit 20 to be protected includes a DC bus 21, the DC side of the inverter module 30 is connected to the DC bus 21, and the DC bus 21 is correspondingly provided with a lightning protection circuit 10. The positive pole of the DC bus 21 is grounded via the first capacitor 11 and the first lightning protection module 12 of the lightning protection circuit 10, and the negative pole of the DC bus 21 is grounded via the first capacitor 11 and the first lightning protection module 12 of the lightning protection circuit 10. Thus, the lightning protection circuit 10 can provide a better lightning protection effect on the inverter on the DC side.

[0050] The inverter generally further includes a bus capacitor 80 , one end of which is connected to the DC bus 21 , and the other end of which is connected to the inverter module 30 .

[0051] like Figure 3 As shown, in this embodiment, the electronic device further includes an AC branch 40 , the AC side of the inverter module 30 is connected to the AC branch 40 , and the AC branch 40 is correspondingly provided with an AC lightning protection circuit 50 .

[0052] The AC lightning protection circuit 50 can be set up using relevant technologies. For example, it includes a second lightning protection module 51, which is not described in detail here. Therefore, both the DC side and the AC side of the electronic device have lightning protection, which provides more comprehensive protection for the electronic device with high safety and reliability.

[0053] In the lightning protection scheme of the traditional inverter, when there is a lightning strike on the DC side, the surge current is discharged through the lightning protection module on the DC side. Since the rated voltage of the lightning protection module is relatively large and the residual residual pressure is relatively large, part of the current can also pass through the DC side lightning protection module-AC side lightning protection module-AC branch 40 (for example, AC output module 41)-inverter module 30-bus capacitor 80, and then return to the input end of the DC bus 21, such as photovoltaic module 90 or junction box. Due to the large residual pressure, the surge current of this circuit is large, which will cause the risk of damage to the components on the path. In the utility model, the lightning protection circuit 10 configures the first capacitor 11 so that the rated voltage of the first lightning protection module 12 can be configured smaller, so that the residual residual pressure is smaller, which can reduce the risk of damage to the components in the above circuit.

[0054] It should be understood that the DC bus 21 corresponding to the lightning protection circuit 10 may include a DC bus located at the output end of the photovoltaic module 90 (refer to Figure 3 The portion between PV+ and PV-) and the input end of the combiner box may also include a portion between the output end of the combiner box and the bus capacitor 80, which is not a limitation and may adopt relevant technologies.

[0055] Optionally, the electronic device further includes an input capacitor, which is located on the DC side of the inverter module 30 .

[0056] Specifically, the two ends of the input capacitor are connected to the two poles of the DC circuit 20 to be protected. The input capacitor is used to smooth the DC voltage to ensure the stability and reliability of the DC voltage during the operation of the inverter. The input capacitor can help smooth the fluctuation of the DC voltage, reduce the noise and ripple of the voltage, and provide a stable DC power supply to the inverter module 30. When the DC power supply changes suddenly, the input capacitor can buffer the power fluctuation. The input capacitor can provide transient response capability, allowing the inverter system to respond more quickly to load changes or other external factors.

[0057] When the lightning protection circuit 10 adopts the above-mentioned solution 1, the first capacitor 11 of the lightning protection circuit 10 can be used as an input capacitor, which can reduce the number of components required.

[0058] like Figure 4 As shown, optionally, the electronic device further includes a battery 60, which is used to store electrical energy and release electrical energy when necessary to meet the working needs of the electronic device.

[0059] Exemplarily, the battery 60 is charged from the DC bus 21 through the step-down branch, and is discharged to the DC bus 21 through the step-up branch.

[0060] Specifically, the battery 60 is mainly used to release the stored electric energy when the electric energy provided by the photovoltaic module 90 is insufficient, and output it to the power grid or load after being inverted by the inverter module 30. This part can adopt relevant existing technologies. The buck branch and the boost branch are not shown. For example, it can adopt the technical solution corresponding to the second battery group proposed in the Chinese patent invention application with application number 2019101748972 and invention name Photovoltaic Energy Storage Inverter System.

[0061] In this embodiment, the electronic device can be a photovoltaic storage integrated device, which can integrate photovoltaic components 90, inverters, batteries 60, controllers and other key components. It is a device that integrates multiple functions, can directly convert solar energy into electrical energy, and can store electrical energy or output electrical energy for power supply.

[0062] In a further optional scheme, a photovoltaic lightning protection branch is correspondingly arranged between the two output ends of the photovoltaic component 90, and a battery lightning protection circuit 70 is correspondingly arranged between the two output ends of the battery 60, and at least one of the photovoltaic lightning protection branch and the battery lightning protection circuit 70 is the lightning protection branch of the above-mentioned embodiment.

[0063] like Figure 4 As shown, illustratively, the photovoltaic lightning protection branch is the lightning protection branch of the above embodiment, and the battery lightning protection circuit 70 can adopt the lightning protection technology before this application. For example, the battery lightning protection circuit 70 includes a third lightning protection module 71.

[0064] Exemplarily, the photovoltaic lightning protection branch may adopt the lightning protection technology before this application, and the battery lightning protection circuit 70 is the lightning protection branch of the above embodiment.

[0065] Exemplarily, both the photovoltaic lightning protection branch circuit and the battery lightning protection circuit adopt the lightning protection branch circuit of the above embodiment.

[0066] Specifically, the two output terminals of the battery 60 (i.e. Figure 4 BAT+ and BAT-) are grounded through a battery lightning protection circuit 70.

[0067] In this way, both the photovoltaic module 90 and the battery 60 have lightning protection and good lightning protection performance.

[0068] In a further optional scheme, when a photovoltaic lightning protection branch is correspondingly arranged between the two output ends of the photovoltaic component 90, and a battery lightning protection circuit 70 is correspondingly arranged between the two output ends of the battery 60, the DC circuit 20 to be protected also includes the above-mentioned DC bus 21, the photovoltaic component 90 is connected to the inverter module 30 through the DC bus 21, the battery 60 is charged from the DC bus 21 through the step-down branch, and discharged to the DC bus 21 through the step-up branch, and the rated voltage of the battery lightning protection circuit 70 is lower than the rated voltage of the photovoltaic lightning protection branch.

[0069] The voltage at the output end of the battery 60 is lower than the output voltage of the photovoltaic module 90 or the voltage of the DC bus 21, and the rated voltage of the battery lightning protection circuit 70 can be designed to be smaller. Specifically, when the battery lightning protection circuit 70 is consistent with the lightning protection structure of the photovoltaic lightning protection branch, the specifications of the battery lightning protection circuit 70 are smaller. Therefore, when a lightning strike occurs, most of the surge current is discharged through the battery lightning protection circuit 70. Even if there is residual pressure, the residual pressure is mostly returned to the output end of the photovoltaic module 90 or to the DC bus 21 through the lightning protection branch corresponding to the DC bus 21, which can reduce the surge current that returns to the input end of the DC bus 21 through the AC side lightning protection module-AC branch 40 (for example, AC output module 41)-inverter module 30-bus capacitor 80, thereby reducing the possibility of damage to components in this circuit due to lightning strikes.

[0070] Of course, in another embodiment, when the DC circuit 20 to be protected includes a photovoltaic module 90 and a battery 60, a photovoltaic lightning protection branch may be provided between the two output ends of the photovoltaic module 90, and the photovoltaic lightning protection branch is the lightning protection branch of the above embodiment, while the battery 60 is not provided with the above-mentioned battery lightning protection branch. In this way, the lightning protection cost of the entire electronic device can be reduced to a certain extent.

[0071] Another embodiment of the present invention provides a photovoltaic system, which includes the electronic device of the above embodiment.

[0072] The photovoltaic system may include multiple components such as photovoltaic modules 90, junction boxes, inverters, batteries 60, cables, monitoring systems, etc., which may include a photovoltaic and storage integrated machine.

[0073] The photovoltaic system has all the beneficial effects of the electronic device, which will not be described in detail here.

[0074] Although the utility model is disclosed as above, the protection scope of the utility model is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the utility model, and these changes and modifications will fall within the protection scope of the utility model.

Claims

1. A lightning protection circuit, characterized in that: The lightning protection circuit comprises a first capacitor (11) and a first lightning protection module (12), one end of the first lightning protection module (12) is connected to one end of the first capacitor (11), the other end of the first lightning protection module (12) is used for grounding, and one end of the first capacitor (11) away from the first lightning protection module (12) is used for connecting to a DC circuit (20) to be protected.

2. The lightning protection circuit according to claim 1, characterized in that: The lightning protection circuit comprises two first capacitors (11), the two first capacitors (11) are arranged in series, the ends of the two first capacitors (11) facing away from each other are respectively connected to the positive electrode and the negative electrode of the DC circuit (20) to be protected, and the first lightning protection module (12) is respectively connected to the two first capacitors (11) between the two first capacitors (11).

3. The lightning protection circuit according to claim 1, characterized in that: The lightning protection circuit comprises two of the first capacitors (11) and two of the first lightning protection modules (12); one end of one of the first capacitors (11) and one of the first lightning protection modules (12) is connected to the positive electrode of the DC circuit (20) to be protected, and the other end is grounded; and another end of another of the first capacitors (11) and another of the first lightning protection modules (12) is connected to the negative electrode of the DC circuit (20) to be protected, and the other end is grounded.

4. The lightning protection circuit according to any one of claims 1 to 3, characterized in that: The first lightning protection module (12) comprises an overvoltage protection element.

5. The lightning protection circuit according to claim 4, characterized in that: The overvoltage protection element includes at least one of a varistor and a gas discharge tube.

6. The lightning protection circuit according to any one of claims 1 to 3, characterized in that: The first capacitor (11) is a film capacitor.

7. An electronic device, characterized in that: The electronic device comprises a DC circuit (20) to be protected and a lightning protection circuit according to any one of claims 1 to 6, wherein the lightning protection circuit is connected to the DC circuit (20) to be protected via its first capacitor (11).

8. The electronic device according to claim 7, characterized in that: The electronic device further comprises an inverter module (30), the DC side of the inverter module (30) being connected to the DC circuit (20) to be protected.

9. The electronic device according to claim 8, characterized in that: The electronic device further comprises an AC branch (40) and an AC lightning protection circuit (50); the AC side of the inverter module (30) is connected to the AC branch (40); and the AC branch (40) is correspondingly provided with the AC lightning protection circuit (50).

10. The electronic device according to claim 8 or 9, characterized in that: The DC circuit (20) to be protected comprises a photovoltaic module (90) and a storage battery (60); A photovoltaic lightning protection branch is correspondingly arranged between the two output ends of the photovoltaic component (90), and the photovoltaic lightning protection branch is the lightning protection branch; or a photovoltaic lightning protection branch is correspondingly arranged between the two output ends of the photovoltaic component (90), and a battery lightning protection circuit (70) is correspondingly arranged between the two output ends of the battery (60), and at least one of the photovoltaic lightning protection branch and the battery lightning protection circuit (70) is the lightning protection branch.

11. The electronic device according to claim 10, characterized in that: When a photovoltaic lightning protection branch is provided between two output ends of the photovoltaic assembly (90) and a battery lightning protection circuit (70) is provided between two output ends of the storage battery (60), the DC circuit (20) to be protected further comprises a DC bus (21), the photovoltaic assembly (90) is connected to the inverter module (30) via the DC bus (21), the storage battery (60) is charged from the DC bus (21) via a step-down branch and is discharged to the DC bus (21) via a step-up branch, and the rated voltage of the battery lightning protection circuit (70) is lower than the rated voltage of the photovoltaic lightning protection branch.

12. A photovoltaic system, characterized in that: Comprising the electronic device as described in any one of claims 7 to 11.

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