Inverter and fan anti-freezing control method thereof

Abstract

The invention discloses an inverter and a fan anti-freezing control method thereof. The inverter comprises a fan, an inverter and a controller, a heat sink; the temperature detection unit is arranged on the fan and the radiator and is used for detecting the temperature of the fan and the radiator; the controller is connected with the fan and the temperature detection unit and used for controlling the fan to operate according to the temperature of the fan and the temperature of the radiator. According to the inverter, the freezing risk of the fan is reduced, and the operation reliability is better.

Description

TECHNICAL FIELD

[0001] The embodiment of the present application relates to the technical field of inverters, in particular to an inverter and a fan anti-freezing control method thereof. BACKGROUND

[0002] The photovoltaic inverter is an indispensable equipment in the photovoltaic power generation system. Due to the need of photovoltaic power generation, the photovoltaic inverter needs to work under various environmental conditions such as low temperature and high temperature. Usually, the photovoltaic inverter is equipped with a radiator and a cooling fan to cool the machine. The current control of the inverter cooling fan depends on the temperature of the radiator to start. Under low temperature conditions, the cooling fan will be in a stopped state. The gap between the fan blades and the fan frame is easy to accumulate water. When the ambient temperature drops to below the freezing point (0 DEG C), the water in the gap between the fan blades and the fan frame will freeze and expand, causing the fan blades to be mechanically stuck, and the fan cannot be normally started. The traditional fan defrosting scheme mostly uses the heating fan to melt the ice crystals. However, this method greatly increases the power consumption of the inverter and reduces the reliability of the inverter. SUMMARY

[0003] The present application provides an inverter and a fan anti-freezing control method thereof, aiming at solving the problem that the fan of the inverter cannot be normally started due to icing under low temperature environment.

[0004] In the first aspect, the embodiment of the present application provides an inverter, which comprises: a fan; a radiator; a temperature detection unit arranged between the fan and the radiator and used for detecting the temperature of the fan and the radiator; and a controller connected with the fan and the temperature detection unit and used for controlling the fan to operate according to the temperature of the fan and the radiator.

[0005] Further, the temperature detection unit comprises at least one first temperature sensor and at least one second temperature sensor, the first temperature sensor is arranged on the fan frame of the fan and connected with the controller, and the second temperature sensor is arranged on the base plate of the radiator and connected with the controller.

[0006] Further, the first temperature sensor is arranged on the fan frame of the fan, and the second temperature sensor is arranged on the base plate of the radiator.

[0007] In the second aspect, the present application further provides a fan anti-freezing control method of an inverter, which is applied to the inverter of the first aspect and comprises the following steps: obtaining the fan temperature and the radiator temperature of the inverter; selecting one of the fan continuous rotation instruction, the fan intermittent rotation instruction and the fan stopped instruction as the target control instruction according to the fan temperature and the radiator temperature; and controlling the fan of the inverter to operate according to the target control instruction.

[0008] The application provides an inverter and a fan anti-freezing control method thereof, wherein the inverter comprises a fan, a radiator, a temperature detection unit arranged between the fan and the radiator and used for detecting the temperature of the fan and the radiator, and a controller connected with the fan and the temperature detection unit and used for controlling the fan to operate according to the temperature of the fan and the radiator. BRIEF DESCRIPTION OF DRAWINGS

[0009] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort.

[0010] Figure 1 A perspective view of the inverter provided by the embodiment of the present application;

[0011] Figure 2 A zoomed-in view of part A of the inverter provided by the embodiment of the present application; Figure 1

[0012] Figure 3 Another perspective view of the inverter provided by the embodiment of the present application;

[0013] Figure 4 A zoomed-in view of part A of the inverter provided by the embodiment of the present application; Figure 3

[0014] A water accumulation state diagram of the fan of the inverter; Figure 5

[0015] A frozen state diagram of the fan of the inverter; Figure 6

[0016] A step flowchart of the method provided by the embodiment of the present application; Figure 7

[0017] A sub-step flowchart of the method provided by the embodiment of the present application; Figure 8

[0018] A sub-step flowchart of the method provided by the embodiment of the present application; Figure 9

[0019] A sub-step flowchart of the method provided by the embodiment of the present application; Figure 10

[0020] A sub-step flowchart of the method provided by the embodiment of the present application; Figure 11 ​A sub-step flowchart of the method provided by the embodiment of the present application is shown in the figure;

[0021] Figure 12 A sub-step flowchart of the method provided by the embodiment of the present application is shown in the figure;

[0022] Figure 13 A step flowchart of the method provided by the embodiment of the present application is shown in the figure.

[0023] Reference signs:

[0024] 10, inverter; 1, fan; 101, fan frame; 102, fan blade; 2, radiator; 3, temperature detection unit; 31, first temperature sensor; 32, second temperature sensor. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.

[0026] It should be understood that, when used in the specification and the appended claims, the terms "comprise" and "include" indicate the presence of described features, integers, steps, operations, elements, and / or components, but do not exclude one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0027] It should also be understood that the terms used in the present application specification are only for the purpose of describing particular embodiments and are not intended to limit the present application. As used in the present application specification and the appended claims, unless otherwise clearly indicated by the context, the singular forms "a", "an" and "the" are intended to include the plural forms as well.

[0028] It should be further understood that the term "and / or" used in the present application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes these combinations.

[0029] As used in the present application specification and the appended claims, the term "if" can be interpreted as "when" or "upon" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if [a described condition or event] is detected" can be interpreted as meaning "upon determining" or "in response to determining" or "upon detecting [the described condition or event]" or "in response to detecting [the described condition or event]", depending on the context.

[0030] In order to facilitate the understanding of the present application, first of all, the inverter provided by the embodiments of the present application is described. Referring to Figures 1 to 6 , specifically referring to Figure 1 , the inverter 10 provided by the embodiments of the present application comprises: a fan 1; a radiator 2; a temperature detection unit 3 arranged on the fan 1 and the radiator 2, used for detecting the temperature of the fan 1 and the radiator 2; a controller (not shown in the figure) connected to the fan 1 and the temperature detection unit, used for controlling the operation of the fan 1 according to the temperature of the fan 1 and the radiator 2.

[0031] In the specific implementation, the inverter 10 can comprise the fan 1, the radiator 2, the temperature detection unit 3 and the controller, in addition to the circuit and the like for realizing the function of the inverter 10. The radiator 2 is mainly made of a multi-fin structure of copper or aluminum material, used for heat dissipation of the inverter 10. The fan 1 is usually arranged adjacent to the radiator 2, used for forced convection heat dissipation by rotating to generate airflow to cooperate with the radiator 2 to achieve cooling of the machine. The temperature detection unit 3 is arranged on the fan 1 and the radiator 2, and the specific arrangement position is not limited, which can be arranged at a position where temperature data is easy to obtain, such as the base plate of the radiator 2, the fan frame 101 of the fan 1, etc. The controller is the control core of the inverter 10, used for controlling the operation of each functional module of the machine, including controlling the operation of the fan 1. The controller can control the operation of the fan 1 according to the temperature of the fan 1 and the temperature of the radiator 2 detected by the temperature detection unit 3, that is, the operation state of the fan 1 is determined by the controller according to the two temperature parameters of the temperature of the fan 1 and the temperature of the radiator 2.

[0032] In actual application, under some special conditions, such as low-temperature climate environment or night low temperature, the gap between the fan blade 102 and the fan frame 101 of the fan 1 of the inverter 10 is easy to accumulate water during the shutdown of the fan 1, as shown in Figure 5 . And when the ambient temperature suddenly drops below the freezing point (0℃), such as Figure 6As shown, the water in the gap between the fan blade 102 of the fan 1 and the fan frame 101 will freeze and expand, causing the fan blade 102 to mechanically jam. Experiments have shown that when the ice layer is 0.5 mm thick at -5℃, the torque of the fan 1 will decrease by 80%, so it is very difficult or even impossible for the fan 1 to start in the frozen state. The controller controls the operation of the fan 1 in real time according to the temperature detected by the temperature detection unit 3, that is, the temperature of the fan 1 of the inverter 10 and the temperature of the heat sink 2. The controller controls the operation of the fan 1, which can include controlling the fan 1 to continuously rotate, stop, or intermittently rotate. By changing the temperature, the operating state of the fan 1 can be controlled to break the freezing effect of the fan 1 and prevent the water on the fan 1 from freezing due to long-term stop of the fan 1, thereby maintaining the normal operation of the fan 1. The specific process of the controller controlling the operation of the fan 1 will be described in detail in the method below, and will not be described here.

[0033] In further embodiments, with reference to Figures 2 to 4 , the temperature detection unit 3 includes at least one first temperature sensor 31 and at least one second temperature sensor 32, the first temperature sensor 31 is arranged on the fan 1 and connected to the controller, and the second temperature sensor 32 is arranged on the heat sink 2 and connected to the controller. In specific implementation, the temperature detection unit 3 can include at least one first temperature sensor 31 and at least one second temperature sensor 32. The first temperature sensor 31 is arranged on the fan 1 and is mainly used for detecting the temperature of the fan 1. The first temperature sensor 31 can specifically use a waterproof NTC thermistor. The second temperature sensor 32 is arranged on the heat sink 2 and is mainly used for detecting the temperature of the heat sink 2. The second temperature sensor 32 can specifically use a K-type thermocouple. In specific applications, multiple first temperature sensors 31 can be arranged on each fan 1 and multiple second temperature sensors 32 can be arranged on the heat sink 2 to make the temperature acquisition more accurate. The controller controls the operation of the fan 1 according to the fan 1 temperature data and the heat sink 2 temperature data detected by the first temperature sensor 31 and the second temperature sensor 32 to achieve the anti-freezing effect of the fan 1.

[0034] In further embodiments, with reference to Figure 2 and Figure 4 , the first temperature sensor 31 is arranged on the fan frame 101 of the fan 1, and the second temperature sensor 32 is arranged on the base plate of the heat sink 2. In specific implementation, the first temperature sensor 31 is mainly arranged on the fan frame 101 of the fan 1 and is installed by being embedded in the fan frame 101 of the fan 1, which does not affect the operation of the fan 1 and makes the temperature detection more reliable. The second temperature sensor 32 is mainly arranged on the base plate of the heat sink 2 and is fixed on the base plate of the heat sink 2 through heat-conducting silicone grease, which can accurately detect the actual temperature of the heat sink 2 and make the control of the controller more accurate and reliable.

[0035] The inverter of the present application detects the temperature of the fan and the radiator through a temperature detection unit, and the controller controls the fan to operate according to the temperature of the fan and the radiator detected by the temperature detection unit, thereby effectively eliminating the freezing effect of the fan and improving the reliability of the operation of the inverter.

[0036] Please refer to Figure 7 , Figure 7 The flow chart of the fan anti-freezing control method of the inverter provided by the embodiment of the present application is shown in the figure. The inverter applied to the above embodiment has been described in detail in the above embodiment, and for the sake of brevity of the description, it will not be described here again. The fan anti-freezing control method of the inverter will be described in detail below. As shown in Figure 7 the figure, the method comprises the following steps: S110-S130.

[0037] S110, obtaining the fan temperature and the radiator temperature of the inverter.

[0038] In a specific implementation, the control system detects and obtains the fan temperature and the radiator temperature of the inverter through a temperature detection unit of the inverter. In a specific application, a temperature threshold for the system to enter the fan anti-freezing mode can be set, for example, the temperature threshold for the system to enter the fan anti-freezing mode is set to 2℃, and the system enters the fan anti-freezing mode in advance when the temperature detection unit detects that the fan temperature of the inverter is less than 2℃.

[0039] S120, selecting one of the fan continuous rotation instruction, the fan intermittent rotation instruction and the fan stop rotation instruction as the target control instruction according to the fan temperature and the radiator temperature.

[0040] In a specific implementation, after the control system obtains the fan temperature and the radiator temperature of the inverter, it selects one of the fan continuous rotation instruction, the fan intermittent rotation instruction and the fan stop rotation instruction as the target control instruction according to the fan temperature and the radiator temperature. Specifically, the fan continuous rotation instruction is an instruction for driving the fan of the inverter to continuously rotate, and the fan controlled by the fan continuous rotation instruction will continuously rotate; the fan intermittent rotation instruction is an instruction for driving the fan of the inverter to continuously rotate, which is specifically a periodic pulse driving signal, and the fan driven by the fan intermittent rotation instruction will rotate intermittently, for example, the fan rotates once every 15 minutes or 30 minutes; the fan stop rotation instruction is an instruction for controlling the fan of the inverter to stop rotating, and the fan controlled by the fan stop rotation instruction will immediately stop rotating. The target control instruction is the final instruction for controlling the operation of the fan of the inverter, and the control system selects one of the fan continuous rotation instruction, the fan intermittent rotation instruction and the fan stop rotation instruction as the target control instruction according to the fan temperature and the radiator temperature.

[0041] In an embodiment, as Figure 8As shown, the step S120 includes: S121-S122.

[0042] S121 . Compare the fan temperature and the radiator temperature with a first preset freezing point temperature and a preset over-temperature protection temperature, respectively, wherein the preset over-temperature protection temperature is greater than the first preset freezing point temperature.

[0043] In a specific implementation, the control system compares the fan temperature and the radiator temperature with the first preset freezing point temperature and the preset over-temperature protection temperature respectively. The preset over-temperature protection temperature must be greater than the first preset freezing point temperature. Specifically, the first preset freezing point temperature is the critical temperature for water to freeze. The first preset freezing point temperature is usually set to 0°C, and the preset over-temperature protection temperature is used to monitor whether the radiator temperature is too high to set the protection temperature. The preset over-temperature protection temperature is usually set to be adjustable within the range of 60 to 85°C.

[0044] S122: If the fan temperature is less than or equal to the first preset freezing point temperature, and the radiator temperature is less than the preset over-temperature protection temperature, use the fan intermittent rotation instruction as the target control instruction.

[0045] In a specific implementation, when the control system determines that the fan temperature is less than or equal to the first preset freezing point temperature and the radiator temperature is less than the preset over-temperature protection temperature, it indicates that the radiator temperature is within the normal range. If water accumulates between the fan and the fan frame, ice may easily form, causing the risk of mechanical jamming of the fan blades. At this time, the control system uses the intermittent rotation instruction of the fan as the target control instruction, which can drive the fan of the inverter to rotate intermittently, maintain the periodic operation state of the fan, and prevent the water between the fan blades and the fan frame from freezing when the fan stops for a long time. At the same time, compared with the continuous rotation of the fan, intermittent rotation can effectively reduce power consumption and improve system energy efficiency.

[0046] In one embodiment, if Figure 9 As shown, before the step of using the intermittent rotation instruction of the fan as the target control instruction, the steps include: S1221-S1223.

[0047] S1221. Set a rotation time interval of the intermittent rotation instruction of the fan according to the fan temperature and a second preset freezing point temperature, wherein the second preset freezing point temperature is lower than the first preset freezing point temperature.

[0048] In a specific implementation, before the control system uses the fan intermittent rotation instruction as the target control instruction, it first sets the rotation time interval of the fan intermittent rotation instruction according to the fan temperature and the second preset freezing point temperature. The fan intermittent rotation instruction is an instruction to control the inverter fan to rotate intermittently. The rotation time interval of the fan intermittent rotation instruction specifically refers to the time interval from the fan stopping once to the next start of rotation. The second preset freezing point temperature must be lower than the first preset freezing point temperature. When the first preset freezing point temperature is set to 0°C, the second preset freezing point temperature can be set to -10°C.

[0049] S1222: If the fan temperature is greater than the second preset freezing point temperature, set the rotation time interval of the fan intermittent rotation instruction to a first preset time.

[0050] In a specific implementation, when the control system determines that the fan temperature is greater than the second preset freezing point temperature, that is, when the fan temperature is greater than the second preset freezing point temperature but less than or equal to the first preset freezing point temperature, the fan intermittent rotation instruction is set to a first preset time interval. The first preset time can be set as needed and can be set to 15 minutes. In actual application, if the first preset time is set to 15 minutes, when the control system uses the fan intermittent rotation instruction as the target control instruction to control fan operation, the inverter fan will continuously rotate once every 15 minutes. The duration of each fan rotation is not limited and can generally be set to 15 seconds.

[0051] S1223: If the fan temperature is less than or equal to the second preset freezing point temperature, setting the rotation time interval of the fan intermittent rotation instruction to a second preset time, wherein the second preset time is less than the first preset time.

[0052] In a specific implementation, when the control system determines that the fan temperature is less than or equal to the second preset freezing point temperature, the rotation time interval of the fan intermittent rotation instruction is set to the second preset time. The second preset time must be less than the first preset time and can be set specifically according to demand. For example, when the first preset time is set to 15 minutes, the second preset time can be set to 5 minutes. In actual applications, if the second preset time is set to 5 minutes, when the control system uses the fan intermittent rotation instruction as the target control instruction to control the fan operation, the fan of the inverter will rotate once every 5 minutes. There is no limit on the duration of each fan rotation, which is usually set to 15 seconds. By setting the rotation time interval of the fan intermittent rotation instruction to the second preset time, the fan can be rotated more frequently when the temperature is low, further reducing the risk of fan jamming.

[0053] In one embodiment, if Figure 10 As shown, the step S120 includes: S123-S124.

[0054] S123, comparing the radiator temperature with a preset over-temperature protection temperature.

[0055] In specific implementation, the control system compares the radiator temperature with a preset over-temperature protection temperature, which is used to monitor whether the radiator temperature is higher than a set protection temperature, and the preset over-temperature protection temperature is usually adjustable in a range of 60-85℃.

[0056] S124, if the radiator temperature is greater than or equal to the preset over-temperature protection temperature, taking the fan continuous rotation instruction as the target control instruction.

[0057] In specific implementation, when the control system judges that the radiator temperature is greater than or equal to the preset over-temperature protection temperature, it means that the radiator temperature has exceeded the safe temperature range, and the high temperature will affect the normal work of the inverter. At this time, the control system takes the fan continuous rotation instruction as the target control instruction, which can drive the fan of the inverter to rotate continuously, forcibly convect the radiator, and cool the inverter.

[0058] In an embodiment, as shown in Figure 11 the step S120 includes S125-S126.

[0059] S125, comparing the fan temperature and the radiator temperature with a first preset freezing point temperature and a preset over-temperature protection temperature respectively, wherein the preset over-temperature protection temperature is greater than the first preset freezing point temperature.

[0060] In specific implementation, the control system compares the fan temperature and the radiator temperature with a first preset freezing point temperature and a preset over-temperature protection temperature respectively, and the preset over-temperature protection temperature is greater than the first preset freezing point temperature. Specifically, the first preset freezing point temperature is the critical temperature of water freezing, and the first preset freezing point temperature is usually set to 0℃. The preset over-temperature protection temperature is used to monitor whether the radiator temperature is higher than a set protection temperature, and the preset over-temperature protection temperature is usually adjustable in a range of 60-85℃.

[0061] S126, if the fan temperature is less than or equal to the first preset freezing point temperature, and the radiator temperature is greater than or equal to the preset over-temperature protection temperature, taking the fan continuous rotation instruction as the target control instruction.

[0062] In a specific implementation, when the control system determines that the fan temperature is less than or equal to the first preset freezing point temperature and the radiator temperature is greater than or equal to the preset over-temperature protection temperature, it indicates that water accumulation between the fan and the fan frame is likely to freeze and cause the fan blades to be mechanically stuck, and meanwhile, the radiator temperature has exceeded the safe temperature range and needs to be convectively cooled. At this time, the control system uses the fan continuous rotation instruction as the target control instruction to drive the fan of the inverter to continuously rotate, keep the fan running, prevent the water between the fan blades and the fan frame from freezing, and meet the convective cooling of the radiator.

[0063] In an embodiment, as shown in FIG. 1, Figure 12 S127-S128.

[0064] S127, comparing the fan temperature and the radiator temperature with the first preset freezing point temperature and the preset over-temperature protection temperature respectively, wherein the preset over-temperature protection temperature is greater than the first preset freezing point temperature.

[0065] In a specific implementation, the control system compares the fan temperature and the radiator temperature with the first preset freezing point temperature and the preset over-temperature protection temperature respectively, and the preset over-temperature protection temperature is greater than the first preset freezing point temperature. Specifically, the first preset freezing point temperature is the critical temperature at which water freezes, and the first preset freezing point temperature is usually set to 0℃. The preset over-temperature protection temperature is a protection temperature set to monitor whether the radiator temperature is too high, and the preset over-temperature protection temperature is usually set in the range of 60-85℃ and can be adjusted.

[0066] S128, if the fan temperature is greater than the first preset freezing point temperature and the radiator temperature is less than the difference between the preset over-temperature protection temperature and the hysteresis interval temperature, using the fan stop rotation instruction as the target control instruction.

[0067] In a specific implementation, when the control system determines that the fan temperature is greater than the first preset freezing point temperature and the radiator temperature is less than the difference between the preset over-temperature protection temperature and the hysteresis interval temperature, it indicates that water accumulation between the fan and the fan frame will not freeze, and the fan blades will not be mechanically stuck. Meanwhile, the temperature of the radiator is within the safe temperature range, and there is no need for convective cooling. The hysteresis interval temperature can be set according to requirements and can be set to 5-10℃. Setting the hysteresis interval temperature can avoid frequent start and stop of the fan of the inverter. The control system uses the fan stop rotation instruction as the target control instruction to drive the fan of the inverter to stop rotating and reduce unnecessary energy consumption.

[0068] S130, controlling the fan of the inverter to operate according to the target control instruction.

[0069] In a specific implementation, after the control system determines the target control instruction, the control system sends the target control instruction to the fan of the inverter, and controls the fan of the inverter to operate according to the target control instruction. Specifically, when the target control instruction is the continuous rotation instruction of the fan, the control system sends the target control instruction to the fan of the inverter, so that the fan of the inverter continuously rotates and does not stop rotating without receiving a stop instruction; when the target control instruction is the intermittent rotation instruction of the fan, the control system sends the target control instruction to the fan of the inverter, so that the fan of the inverter intermittently rotates, for example, the fan rotates once every 15 minutes and rotates for 15 seconds each time, and does not stop rotating without receiving a stop instruction; and when the target control instruction is the stop rotation instruction of the fan, the control system sends the target control instruction to the fan of the inverter, so that the fan of the inverter stops rotating. The control system controls the fan to operate by sending different target control instructions, so that the fan of the inverter can enter different operating modes under different temperature conditions, and the fan can be prevented from freezing while the system efficiency is effectively improved.

[0070] In an embodiment, as shown in FIG. 1, the step S130 is followed by steps S140-S160. Figure 13

[0071] S140, if the target control instruction is the continuous rotation instruction of the fan or the intermittent rotation instruction of the fan, detecting a rotation state of the fan of the inverter.

[0072] In a specific implementation, after the control system controls the fan of the inverter to operate according to the target control instruction, the control system needs to ensure whether the fan normally operates or whether the fan is blocked. Therefore, when the control system determines that the target control instruction is the continuous rotation instruction of the fan or the intermittent rotation instruction of the fan, the control system detects the rotation state of the fan of the inverter. The rotation state of the fan of the inverter can be detected by detecting the rotation speed or the current of the fan motor.

[0073] S150, obtaining a fan detection result according to the rotation state of the fan.

[0074] In a specific implementation, the control system obtains the fan detection result according to the rotation state of the fan of the inverter. The fan detection result can include two results of fan abnormality and fan normality, and the fan abnormality can include fan rotation speed abnormality, blocking, and the like.

[0075] S160, outputting an alarm signal when the fan detection result is the fan abnormality.

[0076] ​In a specific implementation, when the control system determines that the fan detection result is abnormal, it indicates that the fan has abnormal speed or is blocked, and the fan cannot normally execute the target control instruction. At this time, the system outputs an alarm signal, records a fault code, and the alarm signal can be output in the form of a buzzer alarm or LED light. The system can prompt the user to troubleshoot by outputting the alarm signal.

[0077] To sum up, the method of the embodiment of the application can effectively solve the problem that the inverter fan cannot be normally started due to icing, and has lower energy consumption than the traditional anti-freezing scheme of heating the fan to thaw, and the energy efficiency of the system is improved.

[0078] The above is only a specific implementation of the application, but the protection scope of the application is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the application, and these modifications or replacements should be covered within the protection scope of the application. Therefore, the protection scope of the application should be subject to the protection scope of the claims.

Claims

1. An inverter, characterized in that: include: fan; heat sink; a temperature detection unit, provided on the fan and the radiator, for detecting the temperature of the fan and the radiator; A controller is connected to the fan and the temperature detection unit, and is used to control the operation of the fan according to the temperature of the fan and the radiator.

2. The inverter according to claim 1, characterized in that The temperature detection unit includes at least one first temperature sensor and at least one second temperature sensor. The first temperature sensor is provided on the fan and connected to the controller. The second temperature sensor is provided on the radiator and connected to the controller.

3. The inverter according to claim 2, characterized in that: The first temperature sensor is arranged on the fan frame of the fan, and the second temperature sensor is arranged on the substrate of the radiator.

4. A fan antifreeze control method for an inverter, characterized in that: Applied to the inverter according to any one of claims 1 to 3, the method comprises: Get the fan temperature and radiator temperature of the inverter; selecting one of the fan continuous rotation instruction, the fan intermittent rotation instruction, and the fan stop instruction as a target control instruction according to the fan temperature and the radiator temperature; The fan operation of the inverter is controlled according to the target control instruction.

5. The method according to claim 4, characterized in that The step of selecting one of the fan continuous rotation instruction, the fan intermittent rotation instruction, and the fan stop instruction as the target control instruction according to the fan temperature and the radiator temperature includes: comparing the fan temperature and the radiator temperature with a first preset freezing point temperature and a preset over-temperature protection temperature, respectively, wherein the preset over-temperature protection temperature is greater than the first preset freezing point temperature; If the fan temperature is less than or equal to the first preset freezing point temperature, and the radiator temperature is less than the preset over-temperature protection temperature, the intermittent fan rotation instruction is used as the target control instruction.

6. The method according to claim 5, characterized in that Before using the fan intermittent rotation instruction as the target control instruction, the method includes: setting a rotation time interval of the intermittent rotation instruction of the fan according to the fan temperature and a second preset freezing point temperature, wherein the second preset freezing point temperature is lower than the first preset freezing point temperature; If the fan temperature is greater than the second preset freezing point temperature, setting the rotation time interval of the fan intermittent rotation instruction to the first preset time; If the fan temperature is less than or equal to the second preset freezing point temperature, the rotation time interval of the fan intermittent rotation instruction is set to a second preset time, wherein the second preset time is less than the first preset time.

7. The method according to claim 4, characterized in that The step of selecting one of the fan continuous rotation instruction, the fan intermittent rotation instruction, and the fan stop instruction as the target control instruction according to the fan temperature and the radiator temperature includes: Comparing the heat sink temperature with a preset over-temperature protection temperature; If the radiator temperature is greater than or equal to the preset over-temperature protection temperature, the fan continuous rotation instruction is used as the target control instruction.

8. The method according to claim 4, characterized in that The step of selecting one of the fan continuous rotation instruction, the fan intermittent rotation instruction, and the fan stop instruction as the target control instruction according to the fan temperature and the radiator temperature includes: comparing the fan temperature and the radiator temperature with a first preset freezing point temperature and a preset over-temperature protection temperature, respectively, wherein the preset over-temperature protection temperature is greater than the first preset freezing point temperature; If the fan temperature is less than or equal to the first preset freezing point temperature, and the radiator temperature is greater than or equal to the preset over-temperature protection temperature, the fan continuous rotation instruction is used as the target control instruction.

9. The method according to claim 4, characterized in that The step of selecting one of the fan continuous rotation instruction, the fan intermittent rotation instruction, and the fan stop instruction as the target control instruction according to the fan temperature and the radiator temperature includes: comparing the fan temperature and the radiator temperature with a first preset freezing point temperature and a preset over-temperature protection temperature, respectively, wherein the preset over-temperature protection temperature is greater than the first preset freezing point temperature; If the fan temperature is greater than the first preset freezing point temperature, and the radiator temperature is less than the difference between the preset over-temperature protection temperature and the hysteresis interval temperature, the fan stop instruction is used as the target control instruction.

10. The method according to claim 4, characterized in that After controlling the fan operation of the inverter with the target control instruction, the method further includes: If the target control instruction is the fan continuous rotation instruction or the fan intermittent rotation instruction, detecting the fan rotation state of the inverter; Obtaining a fan detection result according to the fan rotation state; When the fan is abnormal according to the fan detection result, an alarm signal is output.

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