Fan cooling system, control method and inverter

Abstract

The invention discloses a fan cooling system, a control method and an inverter. The fan cooling system comprises a fan assembly, a controller, a power source, a radiator, a shell, a temperature monitoring module and a cover body. The rotating direction of the fan is changed in a specific mode, forward rotation and reverse rotation of the fan are achieved, accordingly, the airflow direction is changed, dust and sundries on the fan and the radiator can be automatically cleaned, the normal working time of a heat dissipation system is prolonged, the manual maintenance cost is reduced, and the product reliability is improved.

Description

Technical Field

[0001] The present invention relates to the field of new energy technology, and in particular to a fan heat dissipation system, a control method and an inverter. Background Art

[0002] The fan cooling system (referred to as the cooling system for short) in the prior art uses a fan to drive the gas to flow through the radiator / heat exchanger, and at the same time, impurities such as dust and lint will inevitably be introduced. Over time, this may cause the cooling system to become dirty and clogged, the fan to vibrate and wear, etc., thereby causing equipment (such as inverters and other converters) to fail and alarm, and fail to work normally. In addition, since the cooling system needs to be manually cleaned and maintained, maintenance is difficult and costly.

[0003] Therefore, it is of great significance to predict the failure of the cooling system, automatically diagnose the cause of the failure, and automatically maintain the cooling system. Summary of the invention

[0004] The object of the present invention is to provide a fan heat dissipation system, a control method and an inverter to solve the problems existing in the above-mentioned prior art.

[0005] First, the present invention provides a fan cooling system, including a fan assembly, a controller, a power supply, a radiator, a shell, a temperature monitoring module and a cover; wherein the shell includes a main shell and a cover, the cover covers the front end of the main shell, the cover covers the back of the main shell, the back of the main shell has an opening, the radiator passes through the opening, the main shell, the cover and one side of the radiator form a cavity, and the electronic device is placed in the cavity; the cover and the back of the main shell are combined to form an air duct, an air inlet is provided below the cover, and an air outlet is provided at a position corresponding to the air inlet on the cover; the fan assembly and the radiator are placed in the air duct, the fan assembly is located below the radiator, the fan assembly includes at least one fan, and the fan has an FG signal line and a forward and reverse rotation function; the controller is used to control the forward rotation, reverse rotation and stop of the fan, and diagnose and process the faults of the fan cooling system, wherein the faults of the fan cooling system include fan aging, fan failure and radiator failure; the power supply supplies power to the fan assembly, and the temperature monitoring module is used to monitor the temperature and transmit it to the controller.

[0006] Furthermore, the fan assembly includes a plurality of fans, and the fan assembly is divided into two groups, and each group of fan assemblies is independently controlled.

[0007] Furthermore, the temperature includes heat sink temperature, internal environment temperature, housing temperature, specific device temperature, and external environment temperature.

[0008] Furthermore, it also includes a power monitoring module for monitoring power-related information.

[0009] Secondly, the present invention also discloses a control method for a fan cooling system, which is applied to the fan cooling system. When the controller monitors that the total operating time of the fan is close to the expected life span of the fan, it issues a fan aging alarm and an expected life expiration time prompt, reminding the user to replace the fan in advance. After the fan is replaced, the corresponding fan's accumulated operating time is cleared and recalculated from 0.

[0010] Furthermore, the controller detects that there is no signal on the fan FG signal line, issues a fan damage alarm, and notifies that maintenance of the fan should be performed.

[0011] Furthermore, if the controller detects that the fan's FG signal line is continuously at a high level / continuously at a low level, or the fan starting current exceeds a preset value and frequently jumps, it will issue a fan stall alarm and control the fan to alternately rotate forward and reverse for a certain period of time, and continuously monitor whether the FG signal returns to normal. If it cannot return to normal, it will notify the fan to be maintained.

[0012] Furthermore, when the difference between the radiator temperature and the internal ambient temperature / shell temperature / specific device temperature / external ambient temperature exceeds the corresponding temperature difference threshold / difference range, and there is no abnormality in the FG signal, a radiator dirtiness and blockage alarm is issued, and the radiator dirtiness and blockage is handled directly by controlling the fan action, or a fan control task is suspended first, and the radiator temperature is lowered below the preset value, and then the radiator dirtiness and blockage is handled by controlling the fan action.

[0013] Furthermore, the method of directly dealing with radiator blockage by controlling fan action means that the fan first rotates forward for t3 time, stops for T3' time, and then reverses for t4 time; or, for a system in which fan components are controlled in groups, the controller controls the first fan component / the second fan component to rotate forward while the second fan component / the first fan component reverses for t3 time, then all stop for t3' time, and then the first fan component / the second fan component reverses while the second fan component / the first fan component rotates forward for t4 time.

[0014] Furthermore, the control schemes for a single fan include a duty cycle control scheme, a power-on reversal scheme, a positive and negative pole swapping scheme, a PWM control line control scheme, and an FG signal line control scheme.

[0015] Furthermore, the present invention also discloses an inverter, comprising the above-mentioned fan heat dissipation system.

[0016] The above-mentioned fan cooling system, control method and inverter change the fan rotation direction in a specific way. By changing the airflow direction through forward and reverse rotation of the fan, dust and debris on the fan and radiator can be automatically cleaned, which can increase the normal working time of the cooling system and reduce manual maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A fan heat dissipation system in an embodiment of the present invention; Figure 2 A fan assembly in a fan heat dissipation system in an embodiment of the present invention; Figure 3 A schematic diagram of a control method for a fan cooling system in an embodiment of the present invention; Figure 4 is a schematic diagram of a corresponding flow chart of a control method for a fan cooling system in another embodiment of the present invention; Description of main component symbols: 1. Fan assembly; 11. First fan; 12. Second fan; 13. Third fan; 14. Fourth fan; 2. Radiator; 3. Air duct; 4. Shell; 6. Cover; 41. Main shell; 42. Cover; 411. Opening.

[0018] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0019] In order to facilitate understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Several embodiments of the present invention are provided in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0020] See also Figure 1 to Figure 2 A fan cooling system includes: a fan assembly 1, a controller, a power supply, a radiator 2, a shell 4, a temperature monitoring module and a cover 6.

[0021] In one embodiment, the cover body 6 is covered on the back of the main shell 41, and is enclosed with the back of the main shell 41 to form an air duct 3. An air inlet is provided at the bottom of the cover body 6 for air intake. At the same time, since the air inlet is provided at the bottom, dust or water can be prevented from falling in, thereby improving the reliability of the equipment. In one embodiment, an air outlet is provided at the top of the cover body 6. In other embodiments, the air outlet can also be provided at the rear, left, or right of the cover body 6. In one embodiment, there are two air outlets, namely, one air outlet above the cover body 6 and one air outlet behind the cover body 6. In particular, the air outlet above the cover body 6 is a small air outlet, and the air outlet behind the cover body 6 is a large air outlet. In one embodiment, there are two air outlets, namely, one air outlet on the left side of the cover body 6 and one air outlet on the right side of the cover body 6. In one embodiment, there are three air outlets, namely, one air outlet on the left side of the cover body 6, one air outlet on the right side of the cover body 6, and one air outlet behind the cover body 6. And so on. It can be understood that the above-mentioned air outlets can be considered to be arranged at positions on the cover body corresponding to the air inlet.

[0022] The power supply (not shown in the figure) supplies power to the fan assembly 1. The fan assembly 1 and the heat sink 2 are placed in the air duct 3, and the fan assembly 1 is located above or below the heat sink 2. The fan assembly 1 may include one or more fans, each of which has a forward and reverse function; each fan has four ports (lines), namely, a positive pole, a negative pole, an FG signal line, and a PWM control line. The positive and negative poles of the fan are used to connect to the positive and negative output terminals of the power supply, the FG signal line is connected to the controller to feedback the fan status, and the PWM control line is used to receive the PWM control signal sent by the controller, thereby controlling the state, speed and direction of the fan.

[0023] In one embodiment, each fan is controlled individually, and the positive and negative poles of each fan are respectively connected to the corresponding positive and negative output terminals of the power supply. The FG signal line of each fan is connected to the controller to feedback the status of each fan to the controller. The controller outputs the corresponding PWM control signal to control the operation of each fan through the PWM control line.

[0024] In one embodiment, when there are multiple fans in a fan assembly, they can be divided into different groups (greater than or equal to two groups), and each group of fan assemblies is independently controlled. In one embodiment, the positive and negative poles of all fans in the same fan assembly are respectively connected to the positive and negative output terminals of the same power supply, and the FG signal line of each fan is connected to the controller for feeding back the status of each fan to the controller. The controller outputs a PWM control signal to control the operation of each fan through the PWM control line. In one embodiment, each fan in the same fan assembly corresponds to a respective PWM control signal output by the controller, and the respective PWM control signals corresponding to all fans in the same fan assembly can be the same or different; in another embodiment, each fan in the same fan assembly corresponds to the same PWM control signal output by the controller; in one embodiment, the fan assembly 1 includes a first fan assembly and a second fan assembly.

[0025] In one embodiment, the fan assembly 1 includes 4 fans, which are arranged in a left-right order, namely, a first fan 11, a second fan 12, a third fan 13, and a fourth fan 14. When the fans are cross-grouped, the first fan 11 and the third fan 13 are the first fan assembly, and the second fan 12 and the fourth fan 14 are the second fan assembly. The FG signal line of the first fan 11, the FG signal line of the second fan 12, the FG signal line of the third fan 13, and the FG signal line of the fourth fan 14 are respectively connected to the controller to feed back the status of the corresponding fan to the controller. The positive poles of the first fan 11 and the third fan 13 in the first fan assembly are both connected to the first positive output terminal of the power supply, and the negative poles of both are both connected to the first negative output terminal of the power supply; the controller outputs a first PWM control signal to the PWM control line of the first fan 11 and the PWM control line of the third fan 13. The positive poles of the second fan 12 and the fourth fan 14 in the second fan assembly are both connected to the second positive output terminal of the power supply, and the negative poles of both are connected to the second negative output terminal of the power supply; the controller outputs a second PWM control signal to the PWM control line of the second fan 12 and the PWM control line of the fourth fan 14.

[0026] In one embodiment, the fan assembly includes 4 fans, which are arranged in left-right order, namely, the first fan 11, the second fan 12, the third fan 13, and the fourth fan 14. When the fans are cross-grouped, the first fan 11 and the third fan 13 are the first fan assembly, and the second fan 12 and the fourth fan 14 are the second fan assembly. The FG signal line of the first fan 11, the FG signal line of the second fan 12, the FG signal line of the third fan 13, and the FG signal line of the fourth fan 14 are respectively connected to the controller to feed back the status of the corresponding fans to the controller. The positive poles of the first fan 11 and the third fan 13 in the first fan assembly are both connected to the first positive output terminal of the power supply, and the negative poles of both are both connected to the first negative output terminal of the power supply; the controller outputs two first PWM control signals to the PWM control line of the first fan 11 and the PWM control line of the third fan 13, respectively, and the two first PWM control signals can be the same or different. The positive poles of the second fan 12 and the fourth fan 14 in the second fan assembly are both connected to the second positive output terminal of the power supply, and the negative poles of both are connected to the second negative output terminal of the power supply; the controller outputs two second PWM control signals to the PWM control line of the second fan 12 and the PWM control line of the fourth fan 14 respectively, and the two second PWM control signals can be the same or different.

[0027] In one embodiment, the fan assembly includes 4 fans, which are arranged in left-right order, namely, the first fan 11, the second fan 12, the third fan 13, and the fourth fan 14. When the fans are grouped in sequence, the first fan 11 and the second fan 12 are the first fan assembly, and the third fan 13 and the fourth fan 14 are the second fan assembly. The FG signal line of the first fan 11, the FG signal line of the second fan 12, the FG signal line of the third fan 13, and the FG signal line of the fourth fan 14 are respectively connected to the controller to feed back the status of the corresponding fans to the controller. The positive poles of the first fan 11 and the second fan 12 in the first fan assembly are both connected to the first positive output terminal of the power supply, and the negative poles of both are both connected to the first negative output terminal of the power supply; the controller outputs a first PWM control signal to the PWM control line of the first fan 11 and the PWM control line of the second fan 12. The positive poles of the third fan 13 and the fourth fan 14 in the second fan assembly are both connected to the second positive output terminal of the power supply, and the negative poles of both are connected to the second negative output terminal of the power supply; the controller outputs a second PWM control signal to the PWM control line of the third fan 13 and the PWM control line of the fourth fan 14.

[0028] In one embodiment, the fan assembly includes 4 fans, which are arranged in a left-right order, namely, a first fan 11, a second fan 12, a third fan 13, and a fourth fan 14. When the fans are grouped in sequence, the first fan 11 and the second fan 12 are the first fan assembly, and the third fan 13 and the fourth fan 14 are the second fan assembly. The FG signal line of the first fan 11, the FG signal line of the second fan 12, the FG signal line of the third fan 13, and the FG signal line of the fourth fan 14 are respectively connected to the controller to feed back the status of the corresponding fans to the controller. The positive poles of the first fan 11 and the second fan 12 in the first fan assembly are both connected to the first positive output terminal of the power supply, and the negative poles of both are both connected to the first negative output terminal of the power supply; the controller outputs two first PWM control signals to the PWM control line of the first fan 11 and the PWM control line of the second fan 12, respectively, and the two first PWM control signals can be the same or different. The positive poles of the third fan 13 and the fourth fan 14 in the second fan assembly are both connected to the second positive output terminal of the power supply, and the negative poles of both are connected to the second negative output terminal of the power supply; the controller outputs two second PWM control signals to the PWM control line of the third fan 13 and the PWM control line of the fourth fan 14 respectively, and the two second PWM control signals can be the same or different.

[0029] In one embodiment, the shell 4 includes a main shell 41 and a cover body 42. The cover body 42 covers the front end of the main shell 41. The back of the main shell 41 has an opening 411. The radiator 2 passes through the opening 411. The main shell 41, the cover body 42, and one side of the radiator 2 form a cavity. Electronic devices are placed in the cavity. The radiator 2 can reduce the ambient temperature inside the cavity and also reduce the temperature of the electronic devices attached thereto.

[0030] In one embodiment, there is one group of radiators 2, which are arranged upward, the fan assembly 1 is located below the radiator 2, and the corresponding electronic components are also arranged upward. Since the radiator 2 is arranged upward, dust accumulation can be avoided to the greatest extent.

[0031] In another embodiment, there are two groups of radiators 2, one group is arranged on the top, and the other group is arranged on the bottom, and the fan assembly 1 is located between the two groups of radiators 2; in one embodiment, the electronic device on the top has a greater heating power, the radiator 2 on the top is larger in size, or / and the heat dissipation teeth on it are dense and long, and the radiator 2 on the bottom is smaller, or / and the heat dissipation teeth on it are sparse and short; in another embodiment, the electronic device on the top has a greater heating power, the radiator 2 on the top is smaller in size, or / and the heat dissipation teeth on it are sparse and short, and the radiator 2 on the bottom is larger in size, or / and the heat dissipation teeth are dense and long, that is, the design of the radiator 2 matches the heating power of the electronic device, and the greater the heating power of the electronic device, the more conducive the design of the radiator 2 is to heat dissipation. It can be understood that the radiator 2 corresponding to the electronic device with greater heating power is called the main radiator, and the radiator 2 corresponding to the electronic device with less heating power is called the slave radiator.

[0032] When the radiator 2 is grouped and arranged on top, in one embodiment, the first fan assembly and the second fan assembly work simultaneously, the first fan assembly reverses, and the second fan assembly reverses, so as to clean the dust of the radiator 2.

[0033] In one embodiment, when the radiator 2 is divided into two groups as described above, the first fan assembly and the second fan assembly can work at the same time, for example, the first fan assembly is reversed and the second fan assembly is reversed, which is convenient for cleaning the dust near the upper radiator 2; or, the first fan assembly rotates forward and the second fan assembly reverses, or the first fan assembly reverses and the second fan assembly rotates forward, which can make it easier for the dust near the upper radiator 2 to fall off.

[0034] The temperature monitoring module is used to monitor the temperature and transmit it to the controller, such as the radiator temperature, the internal temperature of the device (the temperature in the cavity / the temperature in the shell / the temperature in the cavity / the internal ambient temperature), the temperature of a specific device, the shell temperature, and the external ambient temperature; wherein the device may be a power electronic device such as an inverter. In one embodiment, the specific device is located in the cavity.

[0035] In one embodiment, the fan cooling system further includes a power monitoring module for monitoring the real-time power, voltage, current and other power-related information of the device.

[0036] The controller can be used to control the rotation (forward, reverse) and stop of the fan, and diagnose and process the faults of the fan cooling system, wherein the faults of the fan cooling system include fan aging, fan failure, and radiator failure.

[0037] The controller can also be used to clean the data collected from the fan or temperature monitoring module and / or other monitoring modules (such as power monitoring module, etc.), delete invalid data, extract relevant characteristic data under normal working conditions, establish judgment thresholds and save them.

[0038] The controller can also monitor the relevant data of the fan, temperature monitoring module and other modules in real time, and compare them with the corresponding thresholds to determine whether the fan cooling system is working normally, and send instructions to the fan control end based on the diagnosis results to eliminate faults or issue alarm information.

[0039] In one embodiment, the controller may continuously accumulate the operating time of each fan in the fan assembly.

[0040] See also Figure 3 The present invention also discloses a control method for a fan cooling system, which is applied to the aforementioned fan cooling system.

[0041] During the operation of the fan cooling system, the controller continuously monitors the fan's operating time, fan speed, fan current, temperature monitoring module and other module data.

[0042] When the controller detects that the total running time of the fan is close to the expected life of the fan, for example, the total running time of the fan is greater than or equal to L, where L is 95% of the expected life of the fan, or other values ​​(selected according to actual needs or specifications), the controller issues a fan aging alarm and an expected life expiration time reminder to remind the fan to be replaced in advance (notify maintenance). After the fan is replaced, the corresponding fan's accumulated running time is reset and recalculated from 0; in one embodiment, the fan can be replaced automatically, and in another embodiment, the fan is replaced manually.

[0043] If the total running time of the fan is less than L, or the total running time of the fan is greater than or equal to L, but the fan does not need to be replaced, the controller controls the fan to rotate forward at full speed and monitors the fan feedback signal (i.e., FG signal) to determine the real-time speed of the fan.

[0044] In one embodiment, the controller controls the fan to rotate forward at full speed through a PWM control signal, and obtains a fan feedback signal (ie, an FG signal) through transmission of an FG signal line to determine the real-time rotation speed of the fan.

[0045] When the controller detects that there is no signal on the FG signal line of the fan, it issues a fan damage alarm and notifies the fan to be maintained. The maintenance can be automatic or manual.

[0046] In one embodiment, the controller controls the fan to perform multiple alternating forward and reverse rotations through a PWM control signal output by the controller.

[0047] When the controller detects that the fan FG signal line has a signal output, but the FG signal (line) is continuously high / continuously low; or, when the controller detects that the fan current exceeds the preset value, for example, greater than 1.4 times the rated current, and the fan current frequently jumps (that is, the intermittent current of the fan is greater than 1.4 times the rated current), a fan jam alarm is issued, and the controller controls the fan to perform multiple alternating forward and reverse rotations (forward, stop, reverse) for a certain period of time (or alternate forward and reverse rotation Nd times, for example, Nd=2, then alternate forward and reverse rotation 2 times, that is, first forward, stop, reverse once, and then forward, stop, reverse once), and continuously monitors whether the FG signal returns to normal (for example, whether the FG signal is a preset square wave). If it still cannot return to normal, the controller issues a fan jam alarm and notifies to perform maintenance on the fan, which can be automatic maintenance or manual maintenance; if the FG signal is normal or has returned to normal, it means that the fan has returned to normal and the temperature is judged.

[0048] It can be understood that the aforementioned fan damage alarm and fan stall alarm are collectively referred to as fan alarms; fan stall and fan stuck are collectively referred to as fan failures.

[0049] When the controller detects that the difference between the radiator temperature and the internal ambient temperature exceeds the corresponding temperature difference threshold / difference range, and the FG signal is normal (i.e., the FG signal is normal), a radiator blockage alarm is issued, and the controller controls the fan to rotate forward for t3 time, stop for T3' time, and then reverse for t4 time. This is one of the ways to deal with radiator blockage by controlling the fan action, and continuously monitors whether the difference between the radiator temperature and the internal ambient temperature exceeds the corresponding temperature difference threshold / difference range. If exceeded, the radiator is notified for maintenance, which can be automatic or manual.

[0050] In another embodiment, Figure 4 As shown in the figure, when the controller detects that the difference between the radiator temperature and the internal ambient temperature exceeds the corresponding temperature difference threshold / difference range, and the FG signal is normal (i.e., the FG signal is normal), a radiator dirty blockage alarm is issued and a fan control task is suspended. When the radiator temperature drops below the preset value, the controller controls the fan to perform corresponding actions to handle the radiator dirty blockage. For example, the fan first rotates forward for t3 time, stops for T3' time, and then reverses for t4 time, and continuously monitors the number of radiator dirty blockage alarms. If the number of radiator dirty blockage alarms within a certain period is greater than a certain value, the radiator is notified to be maintained, and the maintenance can be automatic or manual.

[0051] It can be understood that when a fan control task is suspended, the fan control task refers to handling the radiator blockage by controlling the fan action; suspending means waiting for a period of time without processing, and then handling the radiator blockage through the corresponding fan action when the radiator temperature drops below the preset value, and then handling the radiator blockage through the corresponding fan action, and before the radiator temperature drops to the preset value, the fan does not reverse; this setting is to avoid the fan entering the reverse state when the temperature is high, and the reversal will further increase the temperature, thereby causing device failures and reducing equipment reliability.

[0052] In another embodiment, for a system where fan components are grouped and controlled, when the controller detects that the difference between the radiator temperature and the internal ambient temperature exceeds the corresponding temperature difference threshold value / difference range, and the FG signal is normal (i.e., the FG signal is normal), a radiator blockage alarm is issued, and the controller controls the first fan component / second fan component to rotate forward while the second fan component / first fan component reverses for t3 time, and then all stop for t3' time, and then the first fan component / second fan component reverses while the second fan component / first fan component rotates forward for t4 time. This is one of the ways to deal with radiator blockage by controlling fan action, and continuously monitors whether the difference between the radiator temperature and the internal ambient temperature exceeds the corresponding temperature difference threshold value / difference range. If it exceeds, the radiator is notified to be maintained, and the maintenance can be automatic or manual. This method can increase the fan air volume and enhance the dust cleaning effect.

[0053] In another embodiment, for a system in which fan components are grouped and controlled, when the controller detects that the difference between the radiator temperature and the internal ambient temperature exceeds the corresponding temperature difference threshold value / difference range, and the FG signal is normal (i.e., the FG signal is normal), a radiator dirty blockage alarm will be issued, and a fan control task will be suspended. When the radiator temperature drops below the preset value, the controller controls the fan components, the first fan component / the second fan component, to rotate forward and the second fan component / the first fan component to rotate reversely for t3 time, and then all stop for t3' time, and then the fan components, the first fan component / the second fan component, rotate forward and reversely and the second fan component / the first fan component rotate forward for t4 time, and continuously monitor the number of radiator dirty blockage alarms. If the number of radiator dirty blockage alarms within a certain period is greater than a certain value, the radiator is notified to be maintained, and the maintenance can be automatic maintenance or manual maintenance.

[0054] Among them, power information such as current and voltage refers to power information such as the current of the device and the voltage of the device; a dirty and blocked radiator is also called a radiator failure.

[0055] Among them, the temperature difference threshold is the set temperature difference value. When the temperature difference value is the difference between the radiator temperature and the internal ambient temperature (that is, the actual temperature difference between the two), the temperature difference threshold is the set temperature difference between the radiator temperature and the internal ambient temperature; the difference range refers to the power information such as current and voltage collected by the power module monitored by the controller in real time, converted into the difference range between the radiator and the internal ambient temperature (the corresponding relationship between power and difference range can be obtained from the specification, etc. ） The internal environment temperature of the present invention is also the temperature inside the shell, the temperature inside the cavity, the temperature inside the cavity, and the temperature inside the device. The internal environment temperature of the present invention can be replaced by the temperature of a specific device, the temperature of the shell, and the external environment temperature. The temperature difference is the difference between the radiator temperature and the temperature of the specific device / shell temperature / external environment temperature. The corresponding temperature difference threshold is the set temperature difference between the radiator and the temperature of the specific device / shell temperature / external environment temperature. The corresponding difference range is the difference range between the radiator and the temperature of the specific device / shell temperature / external environment temperature converted according to the power information.

[0056] It can be understood that the maintenance of the fan in the present invention refers to repairing or replacing the fan, and the maintenance of the radiator refers to repairing (for example, clearing dirt and blockage, etc.) or replacing the radiator, etc.

[0057] In one embodiment, the stop time t3' refers to the time from when the fan assembly receives the stop signal and starts to decelerate to when it stops rotating completely; in another embodiment, the stop time t3' includes the time from when the fan assembly receives the stop signal and starts to decelerate to when it stops rotating completely, as well as the time T3'' when the fan assembly is stationary.

[0058] In one embodiment, in order to stop the fan assembly, the PWM control signal can be stopped so that the fan naturally slows down until it stops rotating; or an opposite PWM control signal (a signal that causes the fan to rotate in the opposite direction) can be given to brake the fan, thereby making the fan stop rotating faster.

[0059] In one embodiment, the aforementioned automatic maintenance of the radiator refers to vibrating the radiator by ultrasound to shake off dirt and blockages, or / and removing dirt and blockages by a micro-manipulator, such as dust, flocs, etc.

[0060] In one embodiment, the controller can control the state of the fan (forward rotation, reverse rotation, stop rotation) according to a preset signal.

[0061] In one embodiment, the controller controls the fan to perform corresponding actions to deal with the radiator being dirty and blocked. For example, after the fan reverses for T4 time, the fault diagnosis result is still the radiator being dirty and blocked. The fan reversal time Δt1 is automatically increased each time (an alarm is given once for each radiator being dirty and blocked) until the reversal time reaches t1_max and then no longer increases.

[0062] In another embodiment, the controller controls the fan to perform corresponding actions to deal with the radiator being dirty and blocked. For example, if the fault diagnosis result is still that the radiator is dirty and blocked within the fan reverse time T4, the fan reverse speed Δv1 is automatically increased each time (an alarm is given once for each radiator being dirty and blocked) until the reverse speed reaches v1_max and then no longer increases.

[0063] In another embodiment, the controller controls the fan to perform corresponding actions to deal with the dirty and clogged radiator. If the first fault diagnosis result within T4 time after the fan reverses is still a dirty and clogged radiator, the fan reversal speed is reduced for a period of time, and then the fan reversal speed is increased for a period of time, and this process is repeated; or, if the first fault diagnosis result within T4 time after the fan reverses is still a dirty and clogged radiator, the fan reversal speed is increased for a period of time, and then the fan reversal speed is reduced for a period of time, and this process is repeated.

[0064] It can be understood that “ / ” in this article represents an “or” relationship.

[0065] In addition, the present application also provides the following control schemes / control methods for a single fan: The first one: Duty cycle control scheme.

[0066] The preset signal is a duty cycle D interval. The preset signal can be understood as a PWM control signal, which is specifically divided into three intervals, namely the first duty cycle interval D1, the second duty cycle interval D2 and the third duty cycle interval D3, which correspond to the fan stop, forward rotation and reverse rotation, respectively. The specific duty cycle value of each interval can correspond to different speeds. For example, D1=(0, 5%], the corresponding fan state is stop; D2=[7%, 10%], the corresponding fan state is reverse rotation; D3=[50%, 1), the corresponding fan state is forward rotation. Alternatively, D1=(0, 10%], the corresponding fan state is stop; D2=[20%, 30%], the corresponding fan state is reverse rotation; D3=[40%, 1), the corresponding fan state is forward rotation, and so on.

[0067] In one embodiment, the preset signal is used not only to control the state of the fan, but also to control the rotation speed during rotation; when the fan is in the rotating state, its rotation speed is proportional to the duty cycle, or the rotation speed is controlled according to the duty cycle, or a combination of the two. The rotation speed is proportional to the duty cycle, that is, the larger the duty cycle D, the faster the fan rotates. For example, when D2=[7%, 10%], the corresponding fan state is reverse rotation, and the fan rotates faster when D2 is 10% than when D2 is 7%; or, when D3=[50%, 1), the corresponding fan state is forward rotation, and the fan rotates faster when D3 is 90% than when D3 is 50%, and so on. The rotation speed is controlled according to the duty cycle, which means that when the duty cycle is within a certain range, the fan's rotation speed remains unchanged. For example, when D2=[7%, 10%], the corresponding fan state is reverse rotation, and the fan's rotation speed is 8000 rpm. The combination of the two means that when the fan is in a rotating state, the rotation speed of the fan can be controlled at a fixed speed or can be proportional to the duty cycle. For example, when D2=[7%, 10%], the corresponding fan state is reverse rotation. When D2 is [7%, 8%], the rotation speed of the fan is 6000 rpm. When D2 is (8%, 10%], the rotation speed of the fan increases linearly according to the duty cycle, and so on. In one embodiment, the minimum reverse speed of the fan is greater than the minimum forward speed of the fan.

[0068] In the first solution, the forward, reverse or stop state of the fan and the speed of the fan are controlled according to the duty cycle of the preset signal.

[0069] The second method is to reverse the circuit before powering on.

[0070] The controller (the controller of the inverter) can control the on and off of the positive and negative poles of the fan. Each fan contains a motor drive module. After the motor drive module detects that the positive and negative poles of the fan are powered on, it controls the fan to reverse for a preset time (for example, T2), then controls the fan to stop for T2' time, and then rotates forward according to the preset duty cycle. The fan is reversed first when it is powered on, first to check whether the fan is normal, second to clean the fan from dirt and blockage, and third to clean the radiator from dirt and blockage.

[0071] The third solution: positive and negative pole exchange solution The controller controls the positive and negative poles of the power supply output terminal to exchange signals (i.e., the positive and negative poles are interchanged). Since the positive and negative output terminals of the power supply are respectively connected to the positive and negative poles of the fan, the positive and negative poles of the fan exchange signals. Once the motor drive module detects the positive and negative pole exchange signals of the fan, it controls the fan to reverse for a preset time (e.g., T2) and adjusts the reverse speed according to the duty cycle of the preset signal, and then controls the fan to stop. At the same time or subsequently, the controller controls the positive and negative output terminals of the power supply to exchange signals again, that is, controls the positive and negative output terminals of the power supply to return to normal, thereby returning the positive and negative poles of the fan to normal. After the motor drive module detects that the positive and negative poles of the fan are normal, it controls the fan to rotate forward and adjusts the forward speed according to the duty cycle of the preset signal.

[0072] In the third solution, the forward, reverse and stop states of the fan are controlled according to the positive and negative output terminal signals of the power supply; and the fan speed is controlled according to the duty cycle of the preset signal.

[0073] The fourth solution: PWM control line control solution.

[0074] That is, the on and off of the PWM control line and the duty cycle of the PWM control signal are controlled by the controller.

[0075] The controller controls the disconnection of the PWM control line. The motor drive module of the fan detects the disconnection of the PWM control line and controls the fan to reverse and reverse at the preset speed. The controller controls the connection of the PWM control line. The motor drive module detects that the fan PWM control line receives the PWM control signal sent by the controller and controls the fan to stop or rotate forward at a certain speed according to the interval corresponding to its duty cycle.

[0076] The fifth solution: FG signal line control solution.

[0077] The controller monitors the fan speed through the FG signal line and can also send a control signal to the FG signal line to control the direction of the fan, thus achieving two-way communication.

[0078] After the motor drive module receives the fan forward rotation signal, reverse rotation signal, and forward / reverse rotation switching signal from the controller through the FG signal line, it controls the fan to perform corresponding steering actions and controls the current speed of the fan according to the duty cycle of the received PWM control signal.

[0079] It can be understood that the aforementioned second solution can be used in combination with several other solutions.

[0080] The invention also discloses an inverter, comprising the above-mentioned fan heat dissipation system.

[0081] The fan cooling system, control method and inverter of the present invention change the rotation direction of the fan in a specific manner. By changing the airflow direction through forward and reverse rotation of the fan, dust and debris on the fan and the radiator can be automatically cleaned, which can increase the normal working time of the cooling system and reduce manual maintenance costs.

[0082] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A fan cooling system, characterized in that: The invention comprises a fan assembly, a controller, a power supply, a radiator, a shell, a temperature monitoring module and a cover; wherein the shell comprises a main shell and a cover, wherein the cover covers the front end of the main shell, the cover covers the back of the main shell, the back of the main shell has an opening, the radiator passes through the opening, the main shell, the cover and one side of the radiator form a cavity, and the electronic device is placed in the cavity; the cover and the back of the main shell form an air duct, an air inlet is provided below the cover, and an air outlet is provided at a position corresponding to the air inlet on the cover; the fan assembly and the radiator are placed in the air duct, the fan assembly is located below the radiator, the fan assembly comprises at least one fan, and the fan has an FG signal line and a forward and reverse rotation function; the controller is used to control the forward rotation, reverse rotation and stop rotation of the fan, and diagnose and process the fault of the fan heat dissipation system, wherein the fault of the fan heat dissipation system includes fan aging, fan failure and radiator failure; the power supply supplies power to the fan assembly, and the temperature monitoring module is used to monitor the temperature and transmit it to the controller.

2. The fan cooling system according to claim 1, characterized in that: The fan assembly comprises a plurality of fans, and the fan assembly is divided into two groups, and each group of fan assemblies is independently controlled.

3. The fan cooling system according to claim 1 or 2, characterized in that: The temperatures include heat sink temperature, internal environment temperature, housing temperature, specific device temperature, and external environment temperature.

4. The fan cooling system according to claim 1 or 2, characterized in that: A power monitoring module is also included for monitoring power-related information.

5. A control method for a fan cooling system, applied to the fan cooling system according to any one of claims 1 to 4, characterized in that: When the controller detects that the total operating time of the fan is close to the expected life of the fan, it issues a fan aging alarm and an expected life expiration time prompt, reminding the user to replace the fan in advance; after the fan is replaced, the corresponding fan's accumulated operating time is reset to zero and recalculated from 0.

6. The control method of the fan cooling system according to claim 5, characterized in that: The controller detects that there is no signal on the fan FG signal line, issues a fan damage alarm, and notifies that the fan should be maintained.

7. The control method of the fan cooling system according to claim 5, characterized in that: When the controller detects that the fan's FG signal line is continuously at a high level / continuously at a low level, or the fan starting current exceeds a preset value and frequently jumps, it issues a fan stall alarm and controls the fan to alternately rotate forward and reverse for a certain period of time, and continuously monitors whether the FG signal returns to normal. If it cannot return to normal, it notifies the fan for maintenance.

8. The control method of the fan cooling system according to claim 5, characterized in that: When the difference between the radiator temperature and the internal ambient temperature / shell temperature / specific device temperature / external ambient temperature exceeds the corresponding temperature difference threshold / difference range, and there is no abnormality in the FG signal, a radiator dirty blockage alarm is issued, and the radiator dirty blockage is handled directly by controlling the fan action. Alternatively, a fan control task is suspended first, and the radiator temperature is lowered below the preset value, and then the radiator dirty blockage is handled by controlling the fan action.

9. The control method of the fan cooling system according to claim 8, characterized in that: The method of directly dealing with radiator blockage by controlling the fan action means that the fan first rotates forward for t3 time, stops for T3' time, and then reverses for t4 time; or, for a system in which fan components are controlled in groups, the controller controls the first fan component / the second fan component to rotate forward while the second fan component / the first fan component reverses for t3 time, then all stop for t3' time, and then the first fan component / the second fan component reverses while the second fan component / the first fan component rotates forward for t4 time.

10. The control method of the fan cooling system according to claim 5, characterized in that: The control schemes for a single fan include duty cycle control scheme, power-on reversal scheme, positive and negative pole swapping scheme, PWM control line control scheme, and FG signal line control scheme.

11. An inverter, characterized in that: A fan heat dissipation system comprising any one of claims 1 to 4.

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