Circuit board anti-vulcanization system and converter

Abstract

The invention provides a circuit board anti-vulcanization system and a converter, and the system comprises a closed housing which is used for accommodating at least one circuit board; the air outlet end of the air charging device is connected with the air inlet end of the closed shell; the air inlet end of the exhaust device is connected with the air outlet end of the closed shell; and the control device is used for controlling the gas charging device to supplement the inert gas into the closed shell when the gas pressure in the closed shell is smaller than a first preset pressure, and controlling the gas discharging device to discharge the inert gas in the closed shell when the gas pressure in the closed shell is larger than a second preset pressure. According to the circuit board anti-vulcanization system and the converter disclosed by the invention, sulfides such as hydrogen sulfide and other corrosive gases in the air can be effectively isolated by utilizing the chemical performance of the inert gas and the positive pressure environment, so that the environmental corrosion influence on the circuit board is greatly reduced.

Description

Technical Field

[0001] The present disclosure relates to the technical field of circuit board protection, and in particular to a circuit board anti-sulfurization system and a converter. Background Art

[0002] With the rapid development of renewable energy power generation, the demand for converters has exploded. In the application of converters, especially in scenarios with harsher natural environments such as offshore wind power, swamp wind power, and surface photovoltaic power generation, it is extremely susceptible to corrosion by sulfides such as hydrogen sulfide. Specifically, the converter will release a lot of heat when working, which makes the circuit board in a high temperature state for a long time. At the same time, there is an operating voltage between the copper layers on the surface of the circuit board. Therefore, under the combined action of temperature and electric field, hydrogen sulfide and copper will react to form copper sulfide, and copper sulfide will continue to grow between the two copper layers according to the distribution of the electric field, which seriously affects the current loop of the circuit board and may even cause the circuit board to fail due to short circuit. Summary of the invention

[0003] The present disclosure aims to solve one of the technical problems in the related art at least to some extent.

[0004] To this end, an object of the present disclosure is to provide a circuit board anti-sulfurization system and a converter.

[0005] To achieve the above-mentioned purpose, the first aspect of the present disclosure provides a circuit board anti-sulfurization system, comprising: a closed shell, the closed shell is used to accommodate at least one circuit board; an inflation device, the air outlet end of the inflation device is connected to the air inlet end of the closed shell; an exhaust device, the air inlet end of the exhaust device is connected to the air outlet end of the closed shell; a control device, the control device is used to control the inflation device to replenish inert gas into the closed shell when the air pressure in the closed shell is less than a first preset pressure, and control the exhaust device to exhaust the inert gas in the closed shell when the air pressure in the closed shell is greater than a second preset pressure; wherein the first preset pressure is greater than the atmospheric pressure outside the closed shell and less than the second preset pressure.

[0006] Optionally, the exhaust device includes: a pressure relief valve, which is arranged on the closed shell, and is used to discharge the inert gas in the closed shell when the air pressure in the closed shell is greater than the second preset pressure, until the air pressure in the closed shell is less than a third preset pressure; wherein the third preset pressure is greater than the first preset pressure and less than the second preset pressure.

[0007] Optionally, the first preset pressure is 1.05 times the standard atmospheric pressure; and / or, the second preset pressure is 1.3 times the standard atmospheric pressure; and / or, the third preset pressure is 1.25 times the standard atmospheric pressure.

[0008] Optionally, the anti-sulfurization system also includes: a pressure sensor, the detection end of the pressure sensor is arranged in the closed shell, and the signal output end of the pressure sensor is connected to the signal input end of the control device, and the pressure sensor is used to detect the air pressure in the closed shell.

[0009] Optionally, the anti-sulfurization system also includes: a temperature sensor, wherein the detection end of the temperature sensor is arranged in the closed shell, and the signal output end of the temperature sensor is connected to the signal input end of the control device, and the temperature sensor is used to detect the temperature in the closed shell.

[0010] Optionally, the anti-sulfurization system also includes: an alarm device, wherein a signal input end of the alarm device is connected to a signal output end of the control device, and the control device is also used to control the alarm device to issue a first alarm message when the air pressure in the closed shell is less than a first preset pressure, and to control the alarm device to issue a second alarm message when the air pressure in the closed shell is greater than a second preset pressure.

[0011] Optionally, a plurality of slots are provided in the closed shell, the plurality of slots are spaced apart along the horizontal direction of the closed shell, and the circuit board is disposed in the slots and along the vertical direction of the closed shell.

[0012] Optionally, a first sealed plug is provided on the closed shell, and the first sealed plug is connected to the signal input end of the circuit board; and / or a second sealed plug is provided on the closed shell, and the second sealed plug is connected to the signal output end of the circuit board.

[0013] Optionally, the closed shell is provided with a light-transmitting plate.

[0014] A second aspect of the present disclosure provides a converter, comprising: a control board, a drive board and a circuit board anti-sulfurization system as provided in the first aspect of the present disclosure, wherein the control board and the drive board are respectively arranged in a closed shell in the anti-sulfurization system.

[0015] The technical solution provided by the present disclosure may have the following beneficial effects:

[0016] Since the outlet end of the inflating device is connected to the inlet end of the closed shell, and the inlet end of the exhaust device is connected to the outlet end of the closed shell, the control device can use the inflating device to fill the closed shell with inert gas, and use the exhaust device to exhaust the inert gas in the closed shell, and the control device controls the inflating device by comparing the air pressure in the closed shell with the first preset pressure, and controls the exhaust device by comparing the air pressure in the closed shell with the second preset pressure, so that the air pressure of the inert gas in the closed shell can be stabilized between the first preset pressure and the second preset pressure, so that a positive pressure environment is formed in the closed shell by using the inert gas. Therefore, when the circuit board is placed in the positive pressure environment formed by the inert gas in the closed shell, the chemical properties of the inert gas and the positive pressure environment can be used to effectively isolate sulfides such as hydrogen sulfide and other corrosive gases in the air, thereby greatly reducing the environmental corrosion effect on the circuit board, and then when the anti-sulfurization system is applied to the converter, the high-performance operation of the converter can be guaranteed.

[0017] Additional aspects and advantages of the present disclosure will be given in part in the following description and in part will be obvious from the following description or learned through practice of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present disclosure will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0019] Figure 1 is a front internal schematic diagram of a circuit board anti-sulfurization system provided in an embodiment of the present disclosure;

[0020] Figure 2 is a front schematic diagram of a circuit board anti-sulfurization system provided in one embodiment of the present disclosure;

[0021] Figure 3 is a schematic diagram of the back side of a circuit board anti-sulfurization system provided by an embodiment of the present disclosure;

[0022] As shown in the figure: 1. closed housing, 11. card slot, 12. first sealed plug, 13. second sealed plug, 14. light-transmitting plate;

[0023] 2. Inflating device, 3. Exhaust device, 4. Pressure sensor, 5. Temperature sensor;

[0024] 100. Circuit board. DETAILED DESCRIPTION

[0025] Embodiments of the present disclosure are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present disclosure, and are not to be construed as limitations of the present disclosure. On the contrary, the embodiments of the present disclosure include all changes, modifications, and equivalents that fall within the spirit and connotation of the appended claims.

[0026] like Figure 1 , Figure 2 and Figure 3 As shown, the embodiment of the present disclosure proposes an anti-sulfurization system for a circuit board 100, comprising: a closed shell 1, an air filling device 2, an exhaust device 3 and a control device (not shown in the figure), the closed shell 1 is used to accommodate at least one circuit board 100, the air outlet end of the air filling device 2 is connected to the air inlet end of the closed shell 1, the air inlet end of the exhaust device 3 is connected to the air outlet end of the closed shell 1, and the control device is used to control the air filling device 2 to add inert gas to the closed shell 1 when the air pressure in the closed shell 1 is less than the first preset pressure, and control the exhaust device 3 to discharge the inert gas in the closed shell 1 when the air pressure in the closed shell 1 is greater than the second preset pressure. The first preset pressure is greater than the atmospheric pressure outside the closed shell 1 and less than the second preset pressure.

[0027] It can be understood that, since the air outlet end of the inflation device 2 is connected to the air inlet end of the closed shell 1, and the air inlet end of the exhaust device 3 is connected to the air outlet end of the closed shell 1, the control device can use the inflation device 2 to fill the closed shell 1 with inert gas, and use the exhaust device 3 to discharge the inert gas in the closed shell 1, and the control device controls the inflation device 2 by comparing the air pressure in the closed shell 1 with the first preset pressure, and controls the exhaust device 3 by comparing the air pressure in the closed shell 1 with the second preset pressure, so that the air pressure of the inert gas in the closed shell 1 can be stabilized between the first preset pressure and the second preset pressure, thereby forming a positive pressure environment in the closed shell 1 by using the inert gas.

[0028] Therefore, when the circuit board 100 is placed in a positive pressure environment formed by the inert gas in the closed shell 1, the chemical properties of the inert gas and the positive pressure environment can be utilized to effectively isolate sulfides such as hydrogen sulfide and other corrosive gases in the air, thereby greatly reducing the environmental corrosion effects on the circuit board 100. When the anti-sulfurization system is applied to the inverter, the high performance operation of the inverter can be guaranteed.

[0029] It should be noted that in the relevant embodiments, in order to solve the problem of sulfidation of the circuit board 100, the method of adding an anti-corrosion coating is often used. In order to achieve full coverage, the anti-corrosion layer needs to be sprayed multiple times. The thicker layer will affect the heat dissipation of the circuit board 100. When the temperature difference between different areas on the circuit board 100 is too large, it will cause uneven thermal deformation, thereby destroying the anti-corrosion coating, and gradually causing the circuit board 100 to fail due to corrosion. In addition, it is difficult to effectively deal with the coating problem for the input and output line parts of the circuit board 100, and the input and output line interface parts are often in direct contact with the outside world and have a large current area, which is more susceptible to sulfidation corrosion and hydrogenation corrosion.

[0030] In this embodiment, placing the circuit board 100 in a positive pressure environment formed by inert gas in the closed housing 1 can not only avoid the coating failure problem caused by uneven heat, but also simultaneously perform isolation protection of the input and output line interfaces.

[0031] The closed shell 1 is used to accommodate the circuit board 100 and use inert gas to form a positive pressure environment. The specific type of the closed shell 1 can be set according to actual needs and is not limited to this. For example, the closed shell 1 is a shell with a structure close to a rectangular parallelepiped. The closed shell 1 is made of aluminum metal. Aluminum metal has the advantages of good corrosion resistance, low price, good airtightness, low density, good plasticity, not easy to damage, and good electromagnetic compatibility isolation effect.

[0032] The inflation device 2 is used to replenish the inert gas into the closed shell 1. The specific type of the inflation device 2 can be set according to actual needs and is not limited to this. For example, the inflation device 2 may include: a gas tank, an inflation pump and an inflation valve. The gas tank stores inert gas. The inflation valve is sealed and arranged at the air inlet end of the closed shell 1, the air inlet end of the inflation pump is connected to the air outlet end of the gas tank, and the air outlet end of the inflation pump is connected to the air inlet end of the inflation valve. The inert gas in the gas tank is replenished into the closed shell 1 by utilizing the pressurized delivery of the inflation pump and the on-off coordination of the inflation valve; the inflation pressure rising rate of the inflation device 2 into the closed shell 1 is 5 kPa / second.

[0033] The exhaust device 3 is used to exhaust the inert gas in the closed shell 1. The specific type of the exhaust device 3 can be set according to actual needs and is not limited to this.

[0034] The specific type of the inert gas can be set according to actual needs and is not limited thereto. For example, the inert gas can be nitrogen.

[0035] The control device is used to control the inflation device 2 and the exhaust device 3 according to the air pressure in the closed shell 1. The specific type of the control device can be set according to actual needs and is not limited to this. For example, the control device can be a controller. When the anti-sulfurization system is applied to the inverter, the control device can be the controller of the inverter.

[0036] In some embodiments, the exhaust device 3 includes: a pressure relief valve, which is arranged on the closed shell 1, and the pressure relief valve is used to discharge the inert gas in the closed shell 1 when the air pressure in the closed shell 1 is greater than the second preset pressure, until the air pressure in the closed shell 1 is less than a third preset pressure. The third preset pressure is greater than the first preset pressure and less than the second preset pressure.

[0037] It can be understood that when the air pressure in the closed shell 1 is greater than the second preset pressure, it indicates that the pressure of the inert gas in the closed shell 1 is too high, and the pressure relief valve automatically discharges the inert gas in the closed shell 1 until the air pressure in the closed shell 1 is less than the third preset pressure, thereby ensuring a stable positive pressure environment in the closed shell 1.

[0038] It should be noted that the pressure relief valve is used to automatically discharge the inert gas in the closed shell 1 so that the inert gas pressure in the closed shell 1 is stabilized between the first preset pressure and the second preset pressure. The specific type of the pressure relief valve can be set according to actual needs and is not limited to this. For example, the pressure relief valve can be an automatic valve or an electronic valve controlled by a control device; the pressure relief valve is sealed and arranged at the air outlet end of the closed shell 1.

[0039] In some embodiments, the first preset pressure is 1.05 times the standard atmospheric pressure; and / or, the second preset pressure is 1.3 times the standard atmospheric pressure; and / or, the third preset pressure is 1.25 times the standard atmospheric pressure.

[0040] It can be understood that the control device is used to control the charging device 2 to add inert gas to the closed shell 1 when the air pressure in the closed shell 1 is less than 1.05 times the standard atmospheric pressure, and to control the exhaust device 3 to exhaust the inert gas in the closed shell 1 when the air pressure in the closed shell 1 is greater than 1.3 times the standard atmospheric pressure, until the air pressure in the closed shell 1 is less than 1.25 times the standard atmospheric pressure. As a result, the inert gas pressure in the closed shell 1 can be stabilized between the first preset pressure and the second preset pressure, thereby ensuring a stable positive pressure environment for the circuit board 100.

[0041] Preferably, the inert gas in the closed shell 1 is maintained at 1.2 times the standard atmospheric pressure.

[0042] like Figure 1 As shown, in some embodiments, the anti-sulfurization system also includes: a pressure sensor 4, the detection end of the pressure sensor 4 is arranged in the closed shell 1, and the signal output end of the pressure sensor 4 is connected to the signal input end of the control device, and the pressure sensor 4 is used to detect the air pressure in the closed shell 1.

[0043] It can be understood that since the detection end of the pressure sensor 4 is arranged in the closed shell 1, and the signal output end of the pressure sensor 4 is connected to the signal input end of the control device, the pressure sensor 4 can detect the inert gas pressure in the closed shell 1, and send the detected air pressure signal to the control device, so that the control device can control the inflation device 2 and the exhaust device 3 according to the air pressure in the closed shell 1, thereby realizing a stable positive pressure environment in the closed shell 1 and monitoring the air pressure in the closed shell 1.

[0044] It should be noted that the pressure sensor 4 is used to detect the air pressure in the closed housing 1. The specific type of the pressure sensor 4 can be set according to actual needs and is not limited thereto. The air pressure signal detected by the pressure sensor 4 can be transmitted using the line between the circuit board 100 and the external controller.

[0045] like Figure 1 As shown, in some embodiments, the anti-sulfurization system also includes: a temperature sensor 5, the detection end of the temperature sensor 5 is arranged in the closed shell 1, and the signal output end of the temperature sensor 5 is connected to the signal input end of the control device, and the temperature sensor 5 is used to detect the temperature in the closed shell 1.

[0046] It can be understood that since the detection end of the temperature sensor 5 is arranged in the closed shell 1, and the signal output end of the temperature sensor 5 is connected to the signal input end of the control device, the temperature sensor 5 can detect the temperature in the closed shell 1 and send the detected temperature signal to the control device, so that the control device can realize temperature monitoring according to the temperature in the closed shell 1.

[0047] It should be noted that the temperature sensor 5 is used to detect the temperature in the closed housing 1. The specific type of the temperature sensor 5 can be set according to actual needs and is not limited thereto. The temperature signal detected by the temperature sensor 5 can be transmitted using the line between the circuit board 100 and the external controller.

[0048] In some embodiments, the anti-sulfurization system also includes: an alarm device, a signal input end of the alarm device is connected to a signal output end of the control device, and the control device is also used to control the alarm device to send a first alarm message when the air pressure in the closed shell 1 is less than a first preset pressure, and to control the alarm device to send a second alarm message when the air pressure in the closed shell 1 is greater than a second preset pressure.

[0049] It can be understood that, since the signal input end of the alarm device is connected to the signal output end of the control device, the control device can use the alarm device to send out an alarm message, for example: when the air pressure in the closed shell 1 is less than the first preset pressure, the control alarm device sends out a first alarm message, and when the air pressure in the closed shell 1 is greater than the second preset pressure, the control alarm device sends out a second alarm message. Thus, by sending out the first alarm message and the second alarm message, the operator can be reminded in time to obtain the air pressure status in the closed shell 1, thereby making the use of the anti-sulfurization system more convenient.

[0050] It should be noted that the alarm device is used to send out the first alarm information or the second alarm information. The specific type of the alarm device can be set according to actual needs and is not limited to this. By way of example, the alarm device can be a sound alarm, a light alarm, or a sound and light alarm. Furthermore, the first alarm information and the second alarm information can be lights of different frequencies, sounds of different frequencies, lights of different colors, sounds of different sizes, etc.

[0051] like Figure 1 As shown, in some embodiments, a plurality of slots 11 are provided in the closed shell 1 , the plurality of slots 11 are spaced apart along the horizontal direction of the closed shell 1 , and the circuit board 100 is disposed in the slots 11 and along the vertical direction of the closed shell 1 .

[0052] It can be understood that since the multiple card slots 11 are spaced apart along the horizontal direction of the closed shell 1, and the circuit board 100 is inserted into the card slots 11 and arranged along the vertical direction of the closed shell 1, the circuit board 100 can be detachably arranged in the closed shell 1 using the card slots 11, which not only enables the stable arrangement of the circuit board 100, but also facilitates disassembly and maintenance. At the same time, the multiple circuit boards 100 can be spaced apart along the horizontal direction of the closed shell 1, and each circuit board 100 is respectively arranged along the vertical direction of the closed shell 1, thereby effectively improving the dust accumulation and gas accumulation in the closed shell 1, making the heat dissipation more balanced and avoiding heat concentration, thereby ensuring the safe and stable operation of the circuit board 100.

[0053] It should be noted that the card slot 11 is used to hold the circuit board 100 . The specific type of the card slot 11 can be set according to actual needs and is not limited to this. For example, the card slot 11 can be a strip slot structure, and one end of the circuit board 100 is held in the card slot 11 .

[0054] like Figure 1 and Figure 3 As shown, in some embodiments, a first sealed plug 12 is provided on the closed shell 1, and the first sealed plug 12 is connected to the signal input end of the circuit board 100; and / or, a second sealed plug 13 is provided on the closed shell 1, and the second sealed plug 13 is connected to the signal output end of the circuit board 100.

[0055] It can be understood that since the first sealed plug 12 is provided on the closed shell 1, and the first sealed plug 12 is connected to the signal input terminal of the circuit board 100, the circuit board 100 can be electrically connected to the external device by using the first sealed plug 12, and the sealing of the first sealed plug 12 can also be used to ensure a stable positive pressure environment in the closed shell 1, thereby stably realizing the anti-sulfurization of the circuit board 100.

[0056] Since a second sealed plug 13 is provided on the closed shell 1, and the second sealed plug 13 is connected to the signal output end of the circuit board 100, the circuit board 100 can be electrically connected to an external device by means of the second sealed plug 13, while the sealing of the second sealed plug 13 can be used to ensure a stable positive pressure environment in the closed shell 1, thereby stably realizing the anti-sulfurization of the circuit board 100.

[0057] It should be noted that the specific types of the first sealed plug 12 and the second sealed plug 13 can be set according to actual needs, and there is no limitation on this. For example, the first sealed plug 12 and the second sealed plug 13 can both be sealed aviation plugs or cable connectors, and the shapes are not limited to rectangular, square, round, etc. Among them, the plug is sealed with the shell, and the wire plug terminals inside the plug are copper metal pins inside and outside, and are sealed inside and outside.

[0058] like Figure 2 As shown, in some embodiments, the closed housing 1 is provided with a light-transmitting plate 14 .

[0059] It is understandable that, since the closed housing 1 is provided with the light-transmitting plate 14 , the operator can use the light-transmitting plate 14 to intuitively observe the internal state of the closed housing 1 , thereby making it easier to monitor the circuit board 100 .

[0060] It should be noted that the light-transmitting plate 14 serves as an observation window for operators to observe the circuit board 100 . The specific type of the light-transmitting plate 14 can be set according to actual needs and is not limited to this. For example, the light-transmitting plate 14 can be a glass plate.

[0061] The embodiment of the present disclosure further proposes a converter, comprising: a control board, a drive board and an anti-sulfurization system of a circuit board 100 as in the embodiment of the present disclosure, wherein the control board and the drive board are respectively arranged in a closed housing 1 in the anti-sulfurization system.

[0062] It can be understood that, since the air outlet end of the inflation device 2 is connected to the air inlet end of the closed shell 1, and the air inlet end of the exhaust device 3 is connected to the air outlet end of the closed shell 1, the control device can use the inflation device 2 to fill the closed shell 1 with inert gas, and use the exhaust device 3 to discharge the inert gas in the closed shell 1, and the control device controls the inflation device 2 by comparing the air pressure in the closed shell 1 with the first preset pressure, and controls the exhaust device 3 by comparing the air pressure in the closed shell 1 with the second preset pressure, so that the air pressure of the inert gas in the closed shell 1 can be stabilized between the first preset pressure and the second preset pressure, thereby forming a positive pressure environment in the closed shell 1 by using the inert gas.

[0063] Therefore, when the control board and the drive board are placed in a positive pressure environment formed by the inert gas in the closed shell 1, the chemical properties of the inert gas and the positive pressure environment can be utilized to effectively isolate sulfides such as hydrogen sulfide and other corrosive gases in the air, thereby greatly reducing the environmental corrosion effects on the control board and the drive board, thereby ensuring the high performance operation of the inverter.

[0064] It should be noted that the specific type of the converter can be set according to actual needs and is not limited thereto. For example, the converter can be an IGBT (Insulated Gate Bipolar Transistor) module.

[0065] In the description of the present disclosure, the terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. In addition, in the description of the present disclosure, unless otherwise specified, "plurality" means two or more.

[0066] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present disclosure includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present disclosure belong.

[0067] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0068] Although the embodiments of the present disclosure have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present disclosure. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present disclosure.

Claims

1. A circuit board anti-sulfurization system, characterized in that: include: A closed housing, the closed housing is used to accommodate at least one circuit board; An inflatable device, wherein an air outlet end of the inflatable device is connected to an air inlet end of the closed shell; An exhaust device, wherein an air inlet end of the exhaust device is connected to an air outlet end of the closed shell; a control device, the control device being used to control the inflation device to replenish the inert gas into the closed shell when the air pressure in the closed shell is less than a first preset pressure, and to control the exhaust device to exhaust the inert gas in the closed shell when the air pressure in the closed shell is greater than a second preset pressure; Wherein, the first preset pressure is greater than the atmospheric pressure outside the closed shell and less than the second preset pressure.

2. The circuit board anti-sulfurization system according to claim 1, characterized in that: The exhaust device comprises: a pressure relief valve, the pressure relief valve being arranged on the closed shell, and the pressure relief valve being used for discharging the inert gas in the closed shell when the air pressure in the closed shell is greater than the second preset pressure, until the air pressure in the closed shell is less than a third preset pressure; Wherein, the third preset pressure is greater than the first preset pressure and less than the second preset pressure.

3. The circuit board anti-sulfurization system according to claim 2, characterized in that: The first preset pressure is 1.05 times the standard atmospheric pressure; and / or, The second preset pressure is 1.3 times the standard atmospheric pressure; and / or, The third preset pressure is 1.25 times the standard atmospheric pressure.

4. The circuit board anti-sulfurization system according to claim 1, characterized in that: The anti-sulfurization system also includes: A pressure sensor, wherein the detection end of the pressure sensor is arranged in the closed shell, and the signal output end of the pressure sensor is connected to the signal input end of the control device, and the pressure sensor is used to detect the air pressure in the closed shell.

5. The circuit board anti-sulfurization system according to claim 1, characterized in that: The anti-sulfurization system also includes: A temperature sensor, wherein the detection end of the temperature sensor is arranged in the closed shell, and the signal output end of the temperature sensor is connected to the signal input end of the control device, and the temperature sensor is used to detect the temperature in the closed shell.

6. The circuit board anti-sulfurization system according to claim 1, characterized in that: The anti-sulfurization system also includes: An alarm device, wherein a signal input end of the alarm device is connected to a signal output end of the control device, and the control device is also used to control the alarm device to issue a first alarm message when the air pressure in the closed shell is less than a first preset pressure, and to control the alarm device to issue a second alarm message when the air pressure in the closed shell is greater than a second preset pressure.

7. The circuit board anti-sulfurization system according to claim 1, characterized in that: A plurality of slots are arranged in the closed shell, and the slots are spaced apart along the horizontal direction of the closed shell. The circuit board is arranged in the slots and along the vertical direction of the closed shell.

8. The circuit board anti-sulfurization system according to claim 1, characterized in that: The closed housing is provided with a first sealed plug, and the first sealed plug is connected to the signal input terminal of the circuit board; and / or, The closed shell is provided with a second sealed plug, and the second sealed plug is connected to the signal output end of the circuit board.

9. The circuit board anti-sulfurization system according to claim 1, characterized in that: The closed shell is provided with a light-transmitting plate.

10. A converter, characterized in that: include: A control board, a drive board and a circuit board anti-sulfurization system as described in any one of claims 1 to 9, wherein the control board and the drive board are respectively arranged in a closed shell in the anti-sulfurization system.

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