A heat dissipation system, a water removal method and a power converter

Abstract

The application discloses a heat dissipation system, a water removal method and a power converter. When the power converter is switched from a non-grid-connected state to a grid-connected state, that is, in an initial grid-connected stage, and the heat dissipation system of the power converter is not in a heat dissipation demand state at this time, the fourth fan can be controlled to operate in a first working mode. Since at least part of the heat dissipation structure is located on the circulation path of the outer circulation air duct, and the airflow circulation direction provided by the fourth fan for providing airflow circulation power for the outer circulation air duct is the direction of flowing from the heat dissipation structure to the heat exchanger, the circulating airflow of the outer circulation air duct can transport part of the heat emitted by the heat dissipation structure to the heat exchanger. The heat exchanger can heat the inner circulation air duct through the part of the heat, and the condensed water can be effectively evaporated by continuously heating for a preset time length, thereby effectively avoiding the problem that the circuit is short-circuited or even the whole machine is disabled due to the condensed water being blown to each electronic device in the sealed cavity.

Description

Technical Field

[0001] This invention relates to the field of power converter technology, and more specifically, to a heat dissipation system, a water removal method, and a power converter. Background Technology

[0002] The heat dissipation system of a power converter can be structurally divided into two parts: an external heat dissipation structure and an internal heat dissipation structure. The external heat dissipation structure is mainly used to dissipate heat from the heat-generating components of the power converter (such as semiconductor devices), while the internal heat dissipation structure is mainly used to dissipate heat from the entire sealed cavity of the power converter, which houses various electronic components, such as magnetic components. Currently, the heat dissipation method for the external heat dissipation structure is mainly air cooling with heat sinks; the internal heat dissipation structure mainly uses heat exchangers for heat exchange, which can effectively reduce the temperature of the internal sealed cavity.

[0003] Power converters typically stop working at night. If the outside temperature drops suddenly, condensation can easily form in the heat exchanger. When the power converter is working during the day, the fan inside the heat exchanger will start and draw (or blow) the condensation in the heat exchanger. This water will flow onto the electronic components in the sealed cavity, causing a short circuit and malfunction of the entire unit.

[0004] In summary, how to solve the problem of short circuits or even complete failure of power converters due to condensation in the sealed cavity has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the present invention provides a heat dissipation system, a water removal method, and a power converter to solve the problem that the presence of condensate in the sealed cavity of the power converter can cause short circuits or even failure of the entire unit.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A heat dissipation system, applied to a power converter, includes:

[0008] A heat sink includes a heat dissipation structure disposed on the outside of the sealed cavity of the power converter and used to dissipate heat from the heat-generating devices inside the sealed cavity.

[0009] External circulation air duct, used for air circulation with the external environment;

[0010] An internal circulation air duct is used for air circulation within the sealed cavity;

[0011] The fourth fan is used to provide airflow circulation power for the external circulation duct;

[0012] The external circulation duct and the internal circulation duct are not interconnected and heat exchange is achieved through a heat exchanger; at least part of the heat dissipation structure is located on the circulation path of the external circulation duct; the operating mode of the fourth fan includes at least a first operating mode, and in the first operating mode, the airflow circulation direction provided by the fourth fan is from the heat dissipation structure to the heat exchanger.

[0013] Optionally, the fourth fan may also include a second operating mode, in which the airflow circulation direction provided by the fourth fan is from the heat exchanger to the heat dissipation structure.

[0014] Optionally, a portion of the external circulation duct is arranged inside the sealed cavity, and at least a portion of the heat exchanger is located inside the sealed cavity;

[0015] And / or, a portion of the internal circulation duct is arranged outside the sealed cavity, and at least a portion of the heat exchanger is located outside the sealed cavity.

[0016] Optionally, a portion of the external circulation duct is arranged inside the sealed cavity, and the entire structure of the heat exchanger is located inside the sealed cavity; the external circulation duct includes a first collection cavity, a heat dissipation pipe assembly, a second collection cavity, a first air duct, and a second air duct, wherein the first collection cavity, the heat dissipation pipe assembly, and the second collection cavity are sequentially connected from top to bottom inside the sealed cavity, and the heat dissipation pipe assembly constitutes the heat exchanger; the first air duct and the second air duct are arranged outside the sealed cavity, wherein the first air duct is used to connect the first collection cavity with the external environment, and the second air duct is used to connect the second collection cavity with the external environment;

[0017] The fourth fan is disposed on the first air duct and / or the second air duct, and at least part of the heat dissipation structure is disposed on the flow path of the first air duct and / or the second air duct.

[0018] Optionally, the sealed cavity is provided with a second ventilation opening for connecting the second collection cavity and the second air duct. The lower edge of the second ventilation opening is not higher than the lower edge of the cavity wall of the second collection cavity and not lower than the lower edge of the cavity wall of the second air duct.

[0019] Optionally, a portion of the internal circulation duct is arranged outside the sealed cavity, and the entire structure of the heat exchanger is located outside the sealed cavity; the sealed cavity is provided with a ventilation outlet, and the portion of the internal circulation duct located outside the sealed cavity is provided with an outer duct port for connecting with the ventilation outlet.

[0020] Wherein, the lower edge of the ventilation outlet is not lower than the lower edge of the outer air duct port.

[0021] Compared to the background technology description, the aforementioned heat dissipation system, applied to a power converter, includes a heat sink, an external circulation duct, an internal circulation duct, and a fourth fan. The heat sink includes a heat dissipation structure disposed on the outside of the power converter's sealed cavity for dissipating heat from heat-generating components within the sealed cavity. The external circulation duct is used for circulation with the external environment; the internal circulation duct is used for circulation with the airflow within the sealed cavity; the fourth fan provides airflow circulation power to the external circulation duct; furthermore, the external and internal circulation ducts are not interconnected and heat exchange is achieved through a heat exchanger; at least a portion of the heat dissipation structure is located on the circulation path of the external circulation duct; the fourth fan operates in at least a first operating mode, and in the first operating mode, the airflow circulation direction provided by the fourth fan is from the heat dissipation structure towards the heat exchanger. In practical applications, when the power converter switches from off-grid to grid-connected mode (i.e., the initial grid-connection phase) and the power converter's cooling system is not in a state requiring cooling, the fourth fan can be controlled to operate in the first working mode. Since at least part of the cooling structure is located on the circulation path of the external circulation duct, and the airflow provided by the fourth fan, which provides airflow power to the external circulation duct, flows from the cooling structure to the heat exchanger, the circulating airflow of the external circulation duct can transfer some of the heat dissipated by the cooling structure to the heat exchanger. The heat exchanger can then use this heat to heat the internal circulation duct, thereby heating the condensate in the internal circulation duct. By continuously heating for a preset time, the condensate can be effectively evaporated, effectively avoiding the problem of short circuits or even complete failure caused by condensate being blown onto electronic components in the sealed cavity.

[0022] In addition, the present invention also provides a water removal method for removing water from a power converter using a heat dissipation system described in any of the above schemes, the water removal method comprising:

[0023] The current operating state of the power converter is obtained, and it is determined whether the current operating state is switching from off-grid state to grid-connected state; if not, the heat dissipation system is controlled to perform heat dissipation operation according to the first preset control logic; if yes, proceed to the next step.

[0024] Determine whether the power converter is in a state requiring heat dissipation. If yes, control the heat dissipation system to perform heat dissipation operation according to the first preset control logic. If no, proceed to the next step.

[0025] The heat dissipation system is controlled to heat and evaporate water from the internal circulation duct according to the second preset control logic and operate continuously for a preset duration.

[0026] The second preset control logic includes at least controlling the fourth fan to operate in the first working mode.

[0027] Since the above-mentioned water removal method inherits the core idea of ​​the above-mentioned heat dissipation system, the two belong to the same general inventive concept. And since the aforementioned heat dissipation system has the above-mentioned technical effects, the water removal method that inherits the core idea of ​​the heat dissipation system should also have the corresponding technical effects, which will not be elaborated here.

[0028] Optionally, the water removal method determines whether the power converter is in a state requiring heat dissipation in the following manner:

[0029] When the operating parameters of the power converter meet at least one of the first and second conditions, the power converter is in a state requiring heat dissipation.

[0030] The first condition is T1≥T 1-1 The second condition is T2≥T 2-1 T1 is the current operating temperature of the heating element, T2 is the current ambient temperature inside the sealed cavity, and T 1-1 The temperature T is set according to the heat dissipation requirements of the heat-generating device. 2-1 The temperature is set according to the heat dissipation requirements of the sealed cavity.

[0031] Optionally, the heat dissipation system further includes a first fan disposed on the heat dissipation structure. The first fan is used to provide power for the airflow of the external environment to flow through the heat dissipation structure, so that at least a portion of the airflow flowing through the heat dissipation structure merges into the external circulation air duct.

[0032] The second preset control logic also includes controlling the rotation of the first fan.

[0033] Optionally, the heat dissipation system further includes a second fan and a third fan, wherein the second fan is disposed in the sealed cavity and is used to agitate the airflow in the sealed cavity; and the third fan is disposed in the sealed cavity and is used to provide power for the airflow circulation of the internal circulation duct.

[0034] Optionally, the second preset control logic further includes controlling the second fan and the third fan to stop rotating.

[0035] Optionally, the internal circulation duct has ventilation openings arranged toward and close to the inner wall of the sealed cavity;

[0036] The second preset control logic also includes controlling the rotation of the third fan, and the airflow circulation power provided by the third fan is configured to be sent from the vent to the inner wall of the sealed cavity.

[0037] Optionally, a water-absorbing structure is provided on the cavity wall of the sealed cavity in the area corresponding to the vent.

[0038] And / or, the internal circulation duct is provided with a water absorption structure.

[0039] Optionally, the heat dissipation system further includes a first fan, a second fan, and a third fan, wherein the first fan is disposed in the heat dissipation structure and is used to provide power for the airflow from the external environment to flow through the heat dissipation structure, so that at least a portion of the airflow flowing through the heat dissipation structure merges into the external circulation duct; the second fan is disposed in the sealed cavity and is used to agitate the airflow within the sealed cavity; the third fan is disposed in the sealed cavity and is used to provide power for the circulation of airflow in the internal circulation duct.

[0040] The first preset control logic includes:

[0041] When T 1-3 >T1≥T 1-1 At that time, control the first fan to rotate;

[0042] When T1≥T 1-3 At that time, the power converter is controlled to undergo overall derating.

[0043] Among them, T 1-3 T is the heat dissipation limit temperature of the heat-generating device, and T 1-3 >T 1-1 The temperature T1 of the heating element and the rotational speed of the first fan satisfy a linear or nonlinear interpolation relationship, wherein T 1-1 The starting temperature of the first fan is configured as T. 1-2 The temperature is configured as the full-speed temperature of the first fan, and T 1-3 >T 1-2 >T 1-1 ;

[0044] And / or, the first preset control logic includes:

[0045] When T 3-3 >T2≥T 3-1 At that time, the second and third fans are controlled to run at full speed, the fourth fan starts to rotate, and the speed of T2 and the speed of the fourth fan satisfy a linear or nonlinear interpolation relationship;

[0046] When T2≥T 3-3 At that time, the power converter is controlled to undergo overall derating.

[0047] When T 3-1 >T2≥T 2-1When the fourth fan stops rotating, the second and third fans start rotating, and the rotation speeds of the second and third fans satisfy a linear or nonlinear interpolation relationship with T2.

[0048] Among them, T 2-1 The starting temperature of the second and third fans is configured as T. 2-2 The full-speed temperature of the second and third fans is configured as T. 3-1 The starting temperature of the fourth fan is configured as T. 3-2 The full-speed temperature T of the fourth fan is configured as follows. 3-3 The temperature limit for heat dissipation of the sealed cavity is configured as T. 3-3 >T 3-2 >T 3-1 ≥T 2-2 >T 2-1 .

[0049] Furthermore, the present invention also provides a power converter, which includes the heat dissipation system described in any of the above-described solutions, and the water removal method described in any of the above-described solutions is used to control the heat dissipation system to perform water removal operation. Since the aforementioned heat dissipation system and water removal method both have the above-described technical effects, the power converter having the aforementioned heat dissipation system should also have the corresponding technical effects, which will not be elaborated further here. Attached Figure Description

[0050] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0051] Figure 1 A control principle diagram of the water removal method for a power converter provided in an embodiment of the present invention;

[0052] Figure 2 A detailed control logic diagram of the water removal method for a power converter provided in an embodiment of the present invention;

[0053] Figure 3 This is a three-dimensional rear view structural diagram of a power converter provided in an embodiment of the present invention;

[0054] Figure 4 This is a schematic diagram of the three-dimensional internal structure of a power converter provided in an embodiment of the present invention;

[0055] Figure 5 This is a rear view structural diagram of a power converter provided in an embodiment of the present invention;

[0056] Figure 6 This is a schematic diagram of the internal front view structure of a power converter provided in an embodiment of the present invention;

[0057] Figure 7 for Figure 6 A schematic diagram of the AA cross-sectional structure;

[0058] Figure 8 for Figure 6 Schematic diagram of the BB cross-section structure.

[0059] in, Figures 1-8 middle:

[0060] 1. Sealed cavity; 2. Heating device; 3. Heat sink; 4. Heat sink fins; 5. First fan; 6. Electronic device; 7. Capacitor; 8. Magnetic device; 9. Second fan; 10. Third fan; 11. Second collection cavity; 12. First collection cavity; 13. Heat sink assembly; 14. Heat exchange fins; 15. Second air duct; 16. Second ventilation opening; 17. First ventilation opening; 18. Fourth fan; 19. Detailed Implementation

[0061] The core of this invention is to provide a heat dissipation system, a water removal method, and a power converter to solve the problem of short circuits or even complete failure of the power converter due to condensation in the sealed cavity.

[0062] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0063] Reference Figures 3-8 As shown, the present invention provides a heat dissipation system applied to a power converter. The power converter may specifically include a sealed cavity 1, a heat-generating device 2 disposed in the sealed cavity 1, and a heat dissipation system for at least dissipating heat from the sealed cavity 1 and the heat-generating device 2.

[0064] The heat-generating device 2 can specifically be a semiconductor device, etc. Of course, those skilled in the art should understand that, in addition to heat-generating devices 2 such as semiconductor devices, the sealed cavity 1 of the power converter can generally also contain electronic devices 7, capacitors 8, magnetic devices 9, etc. These devices generate heat, increasing the temperature of the sealed cavity 1. The heat dissipation of these devices is achieved by setting up a heat dissipation structure inside. Specifically, the above-mentioned heat dissipation system can include a heat sink 4, an external circulation duct, an internal circulation duct, and a fourth fan 19. The heat sink 4 can include a heat dissipation substrate 3 disposed in the sealed cavity 1 and a heat dissipation structure disposed on the outside of the sealed cavity 1 of the power converter for dissipating heat from the heat-generating device 2 in the sealed cavity 1. The heat dissipation structure can specifically be in the form of heat dissipation fins 5, etc. The heat-generating device 2 in the sealed cavity 1 is disposed on the heat dissipation substrate 3. The heat emitted by the heat-generating device 2 is quickly transferred to the heat dissipation substrate 3 and then diffused outward to the heat dissipation fins 5. Of course, it can be understood that the heat dissipation fins 5 are not necessary and can be omitted.

[0065] In addition, the external circulation duct is used for circulation with the external environment; the internal circulation duct is used for circulation with the airflow inside the sealed cavity 1; the fourth fan 19 is used to provide airflow circulation power for the external circulation duct; in addition, the flow paths of the external circulation duct and the internal circulation duct are not connected and heat exchange is achieved through a heat exchanger; at least part of the heat dissipation structure is located on the circulation path of the external circulation duct; the operating mode of the fourth fan 19 includes at least a first operating mode, and in the first operating mode, the airflow circulation direction provided by the fourth fan 19 is the direction of flow from the heat dissipation structure to the heat exchanger.

[0066] In practical applications, when the power converter switches from off-grid to grid-connected mode (i.e., the initial grid-connection stage) and the power converter's cooling system is not in a state requiring cooling, the fourth fan 19 can be controlled to operate in the first working mode. Since at least part of the cooling structure is located on the circulation path of the external circulation duct, and the airflow provided by the fourth fan, which provides airflow circulation power to the external circulation duct, flows from the cooling structure to the heat exchanger, the circulating airflow of the external circulation duct can transfer some of the heat dissipated by the cooling structure to the heat exchanger. The heat exchanger can then heat the internal circulation duct using this heat, thereby heating the condensate in the internal circulation duct. By continuously heating for a preset time, the condensate can be effectively evaporated, effectively avoiding the problem of short circuits or even complete failure caused by condensate being blown onto the electronic components in the sealed cavity 1.

[0067] It should be noted that in order to ensure the normal operation of the power converter under the required heat dissipation state, such as performing conventional heat dissipation according to the first preset control logic, the power converter is usually equipped with some other heat dissipation structures. Therefore, the heat dissipation system may also include the first fan 6, the second fan 10 and the third fan 11 mentioned below, as long as they can perform heat dissipation operations according to the heat dissipation requirements of the power converter, and their specific structures are not more specifically limited.

[0068] In some specific implementations, the operating mode of the fourth fan 19 may also include a second operating mode. In the second operating mode, the airflow circulation direction provided by the fourth fan 19 is from the heat exchanger to the heat dissipation structure. By designing the fourth fan 19 with the above-mentioned structure, when the power converter is in a state requiring heat dissipation, the fourth fan 19 can operate according to the second operating mode. At this time, when the airflow in the external environment flows through the external circulation duct, the airflow first flows through the heat exchanger and then through the heat dissipation structure. This allows the airflow temperature flowing through the heat exchanger to be at a lower temperature, avoiding the influence of the heat dissipation structure, which helps to improve the heat exchange efficiency of the heat exchanger and enhance the heat dissipation effect.

[0069] In some specific implementation schemes, the aforementioned external circulation duct can be designed with a portion of its duct structure arranged inside the sealed cavity 1, and at least a portion of the heat exchanger (i.e., part or all of the heat exchanger's structure) is located inside the sealed cavity 1. The advantage of this structure is that it fully utilizes the internal space of the sealed cavity 1 and allows the heat exchanger itself to form part of the internal circulation duct with the sealed cavity 1. This fully utilizes the circulating fan within the sealed cavity 1, helping to improve heat exchange efficiency, reduce the number of circulating fans, and enhance the neatness of the sealed cavity 1's appearance. Alternatively, it can be understood that a portion of the internal circulation duct can be arranged outside the sealed cavity 1, and at least a portion of the heat exchanger (i.e., part or all of the heat exchanger's structure) is located outside the sealed cavity 1. The advantage of this design is that it minimizes the use of internal space within the sealed cavity 1, making it easier to arrange relevant electrical components within the sealed cavity 1. Alternatively, part of the heat exchanger structure can be located inside the sealed cavity 1, and part can be located outside the sealed cavity 1. In this case, part of the circulating air duct structure is arranged inside the sealed cavity 1, and part of the internal circulating air duct is arranged outside the sealed cavity 1. In practical applications, the corresponding arrangement method can be selected according to different arrangement requirements, and no further specific limitations are made here.

[0070] In a further embodiment, a portion of the external circulation duct is arranged inside the sealed cavity 1, and the entire structure of the heat exchanger is located inside the sealed cavity 1. Specifically, the external circulation duct may include a first collection cavity 13, a heat dissipation pipe assembly 14, a second collection cavity 12, a first duct, and a second duct 16. The first collection cavity 13, the heat dissipation pipe assembly 14, and the second collection cavity 12 are connected sequentially from top to bottom inside the sealed cavity 1. The first duct and the second duct are arranged outside the sealed cavity 1, and the first duct is used to connect the first collection cavity 13 with the external environment, and the second duct is used to connect the second collection cavity with the external environment. One end of the heat dissipation tube assembly 14 is connected to the first collection cavity 13, and the other end is connected to the second collection cavity 12. The heat dissipation tube assembly 14 forms a heat exchanger that achieves heat exchange between the inner and outer circulation air ducts. To improve the heat exchange efficiency of the heat exchanger, the heat dissipation tube assembly 14 is preferably designed as a flat tube, and heat exchange fins 15 can also be provided on the outer wall of the heat dissipation tube assembly 14. In addition, the first air duct, the first collection cavity 13, the heat dissipation tube assembly 14, the second collection cavity 12, and the second air duct 16, which are connected in sequence, form the outer circulation air duct, and the air duct structure formed by the gap between the outer tube walls of the heat dissipation tube assembly 14 and the inner cavity space of the sealed cavity 1 forms the inner circulation air duct. By designing the above-mentioned structural form, the arrangement of the first air duct, the second air duct 16, the first collection cavity 13, and the second collection cavity 12 can form a certain buffer space for the airflow entering and leaving the outer circulation air duct, which makes it easier to achieve uniform airflow and ultimately helps to improve the heat exchange effect of the heat exchanger.

[0071] Furthermore, the aforementioned fourth fan 19 can be optionally installed on the first air duct and / or the second air duct 16, and at least part of the heat dissipation structure can be optionally installed on the flow path of the first air duct and / or the second air duct 16. By designing it into this structural form, on the one hand, the arrangement space in the sealed cavity 1 can be saved, and on the other hand, the fourth fan 19 can be more convenient to disassemble, install, and maintain.

[0072] In a further embodiment, the fourth fan 19 is preferably disposed on the second air duct 16. Because the second air duct 16 is connected to the second collection chamber 12, and the second collection chamber 12 is located at the lowest position in the sealed cavity 1, when the portion of the external circulation air duct located inside the sealed cavity 1 contains condensate, most of this condensate is concentrated in the second collection chamber 12. This allows the condensate to evaporate after heating and flow directly from the second collection chamber 12 into the second air duct 16 with the circulating airflow, and then be directly drawn away by the fourth fan 19 to the external environment. This minimizes the possibility of water vapor re-entering the heat dissipation pipe 14 and causing secondary condensation in the external circulation air duct.

[0073] In a further implementation plan, refer to Figure 7As shown, a second ventilation opening 17 for connecting the second collection chamber 12 and the second air duct 16 can be provided on the sealed cavity 1. Similarly, a first ventilation opening 18 should be provided on the sealed cavity 1 at the connection position between the first collection chamber 13 and the first air duct. The lower edge of the second ventilation opening 17 is preferably designed to be no higher than the lower edge of the cavity wall of the second collection chamber and no lower than the lower edge of the cavity wall of the second air duct 16. By designing this structure, water vapor in the second collection chamber 12 can flow into the second air duct 16 as much as possible, avoiding the accumulation of condensate at the bottom of the second collection chamber 12. At the same time, it can prevent condensate at the bottom of the second air duct 16 from flowing back into the second collection chamber, effectively preventing the accumulation of condensate in the air duct inside the sealed cavity 1.

[0074] In addition, the present invention also provides a water removal method for removing water from a power converter using the heat dissipation system described in any of the above schemes, referring to... Figure 1 As shown, the water removal method includes:

[0075] Obtain the current operating state of the power converter and determine whether the current operating state is switching from off-grid state to grid-connected state, that is, whether it is in the newly grid-connected state; if not, control the heat dissipation system to perform heat dissipation operation according to the first preset control logic; if yes, proceed to the next step.

[0076] Determine whether the power converter is in a state requiring heat dissipation. If so, control the heat dissipation system to perform heat dissipation operation according to the first preset control logic. If not, proceed to the next step.

[0077] The heat dissipation system is controlled to heat and evaporate water from the internal circulation duct according to the second preset control logic and continue to operate for a preset time.

[0078] The second preset control logic includes at least controlling the fourth fan 19 to operate in the first working mode.

[0079] It should be noted that, as mentioned earlier, to ensure the power converter operates normally under the required cooling conditions, i.e., to perform conventional cooling according to the first preset control logic, the power converter is usually equipped with other cooling structures, such as the first fan 6, the second fan 10, and the third fan 11. These only need to be able to perform cooling operations according to the power converter's cooling requirements; their specific structures are not further limited. The first preset control logic refers to the cooling system's ability to control the cooling structures to perform the cooling purpose; the specific cooling control method is not specifically limited. Furthermore, the second preset control logic is mainly to distinguish it from the first preset control logic; its main purpose is to heat and evaporate water from the internal circulation duct.

[0080] Since the above-mentioned water removal method inherits the core idea of ​​the above-mentioned heat dissipation system, the two belong to the same general inventive concept. And since the aforementioned heat dissipation system has the above-mentioned technical effects, the water removal method that inherits the core idea of ​​the heat dissipation system should also have the corresponding technical effects, which will not be elaborated here.

[0081] In some specific implementation schemes, the above-mentioned water removal method can determine whether the power converter is in a state requiring heat dissipation in the following ways:

[0082] Obtain the current operating temperature T1 of the heating device 2 and / or the current ambient temperature T2 inside the sealed cavity 1;

[0083] When the operating parameters of the power converter meet at least one of the first and second conditions, the power converter is in a state of demand for heat dissipation.

[0084] When the operating parameters of the power converter do not meet the first condition and do not meet the second condition, the power converter is not in the required heat dissipation state.

[0085] The first condition is T1≥T 1-1 This indicates that the heat-generating device 2 is in a state requiring heat dissipation, and the second condition is T2≥T. 2-1 This indicates that the sealed cavity 1 is in a state requiring heat dissipation, T1 is the current operating temperature of the heat-generating device 2, T2 is the current ambient temperature inside the sealed cavity 1, and T... 1-1 The temperature T is set according to the heat dissipation requirements of the heat-generating device 2. 2-1 The temperature is set according to the heat dissipation requirements of the sealed cavity 1.

[0086] It should be noted that the required temperature setting varies for different heating devices 2; similarly, the required temperature setting for the sealed cavity 1 also varies for different power converters. In actual application, those skilled in the art can select the specific temperature setting value according to the type of heating device and power converter, which is not difficult for them, and no further specific limitations are made here.

[0087] In some other specific implementation schemes, refer to Figure 2 Combination Figures 3-8The aforementioned heat dissipation system may further include a first fan 6 disposed on the heat dissipation structure. The first fan 6 provides power for the airflow from the external environment through the heat dissipation structure, so that at least a portion of the airflow flowing through the heat dissipation structure merges into the external circulation duct. Specifically, the heat dissipation structure may be the heat dissipation fins 5 of the radiator 4. The first fan 6 is preferably designed to be located above the tips of the heat dissipation fins 5, that is, the air outlet direction of the first fan 6 is perpendicular to the large surface of the radiator substrate. In this way, the cold air blown out by the first fan 6 can simultaneously cool multiple heat-generating devices 2. In addition, the second preset control logic may also include controlling the rotation of the first fan 6. By controlling the rotation of the first fan 6, under the dewatering condition, more airflow on the heat dissipation structure can merge into the external circulation duct per unit time, which helps to improve the heating effect of the external circulation duct on the internal circulation duct through the heat exchanger, and helps to increase the evaporation rate of condensate in the internal circulation duct. In addition, it can reduce the temperature of the heat-generating devices 2, thereby helping to keep the power converter in a non-heat dissipation demand state for a longer period of time, which is more conducive to the thorough removal of condensate.

[0088] In some other specific implementation schemes, refer to Figure 2 Combination Figures 3-8 The aforementioned heat dissipation system may further include a second fan 10 and a third fan 11. The second fan 10 is disposed within the sealed cavity 1 and is used to disturb the airflow within the sealed cavity 1. The specific installation position of the second fan 10 can be selected according to the layout requirements, as long as it can achieve airflow disturbance. In this invention, the second fan 10 is preferably designed on the side opposite to the third fan 11, which can improve the overall disturbance effect on the sealed cavity 1. The third fan 11 is disposed within the sealed cavity 1 and is used to provide power for the airflow circulation of the internal circulation duct. When the heat exchanger is located inside the sealed cavity 1, the third fan 11 can be specifically arranged in front of or behind the heat exchanger, which can reduce the ambient temperature of the sealed cavity 1.

[0089] In a further implementation plan, refer to Figure 2 Combination Figures 3-8 The aforementioned second preset control logic may also include controlling the second fan 10 and the third fan 11 to stop rotating. By designing it in this structural form, when the heat dissipation system performs the dewatering operation, the heat dissipation system does not actively control the airflow inside the sealed cavity 1, and the water vapor evaporated in the internal circulation duct is not easily dispersed to the electrical components inside the sealed cavity 1 by the airflow disturbance.

[0090] In some other specific implementation schemes, refer to Figures 3-8The aforementioned internal circulation duct can have ventilation openings facing and close to the inner wall of the sealed cavity 1. In this case, the second preset control logic can also include controlling the rotation of the third fan 11, and the airflow circulation power provided by the third fan 11 is configured to be delivered from the ventilation openings to the inner wall of the sealed cavity 1. By designing this structure, condensate that has escaped into the internal circulation duct can be blown onto the area corresponding to the ventilation opening on the cavity wall of the sealed cavity 1. For the sealed cavity 1, the insulation requirements for this area are relatively low. It should be noted that the rotation direction of the third fan 11 can be designed as a bidirectional control structure, for example, when a water removal operation is required, the rotation direction of the third fan 11 is reversed; when it is necessary to disturb the airflow inside the sealed cavity 1, the rotation direction of the third fan 11 can be either forward or reversed.

[0091] It is understandable that a water-absorbing structure can be installed on the cavity wall of the aforementioned sealed cavity 1 in the area corresponding to the ventilation opening; or a water-absorbing structure can be installed inside the internal circulation duct. The water-absorbing structure is mainly made of water-absorbing material, which temporarily absorbs the condensate and then evaporates it under high temperature.

[0092] In some other specific implementation schemes, refer to Figure 2 Combination Figures 3-8 When the cooling system includes the first fan 6, the aforementioned first preset control logic may specifically include:

[0093] When T 1-3 >T1≥T 1-1 At that time, control the first fan 6 to rotate;

[0094] When T1≥T 1-3 At that time, the entire power converter is derated.

[0095] Among them, T 1-3 T is the heat dissipation limit temperature of heat-generating device 2, and T 1-3 >T 1-1 .

[0096] It should be noted that the temperature T1 of the aforementioned heating device 2 and the rotational speed of the first fan 6 can satisfy a linear or nonlinear interpolation relationship, wherein T 1-1 The starting temperature of the first fan 6 is configured as T. 1-2 Configured to the full-speed temperature of the first fan 6, and T 1-3 >T 1-2 >T 1-1 By designing the rotational speed of the first fan 6 and the temperature T1 of the heating element 2 in the aforementioned manner, the temperature T1 control of the heating element 2 becomes more flexible and intelligent.

[0097] When the heat dissipation system includes the second fan 10 and the third fan 11, the heat dissipation system may also include the following when performing heat dissipation operation according to the first preset control logic:

[0098] When T 3-3 >T2≥T 3-1 At this time, the second fan 10 and the third fan 11 are controlled to run at full speed, and the fourth fan 19 is started to rotate. During this process, the airflow in the sealed cavity 1 is fully disturbed by the second fan 10 and the third fan 11, so that the airflow inside the sealed cavity 1 can fully exchange heat with the air heat exchanger 12. At the same time, the fourth fan 19 can discharge the airflow that has completed heat exchange to the outside environment, so that the sealed cavity 1 can be fully cooled.

[0099] When T2≥T 3-3 At this time, the entire power converter is derated. At this time, the temperature inside the sealed cavity 1 has reached the heat dissipation limit. The heat dissipation function of the heat dissipation system can no longer meet the heat dissipation requirements. The entire power converter needs to be derated in order to meet the normal operation of the equipment.

[0100] When T 3-1 >T2≥T 2-1 When the fourth fan 19 stops rotating, the second fan 10 and the third fan 11 start rotating. At this time, the temperature inside the sealed cavity 1 is at a relatively low level, and the heat dissipation demand gradually decreases. It is only necessary to start the second fan 10 and the third fan 11 to disturb the airflow to meet the current heat dissipation demand.

[0101] Among them, T 2-1 The starting temperature of the second fan 10 and the third fan 11 is configured as T. 2-2 The full-speed temperature of the second fan 10 and the third fan 11 is configured as T. 3-1 The starting temperature of the fourth fan 19 is configured as T. 3-2 The full-speed temperature of the fourth fan 19 is T. 3-3 The maximum heat dissipation temperature of the sealed cavity 1, and T 3-3 >T 3-2 >T 3-1 ≥T 2-2 >T 2-1 .

[0102] It should be noted that when T 3-3 >T2≥T 3-1 At that time, the temperature T2 of the sealed cavity 1 and the rotational speed of the fourth fan 19 are preferably designed to satisfy a linear or nonlinear interpolation relationship; similarly, when T 3-1 >T2≥T 2-1At the same time, the rotational speeds of the second fan 10 and the third fan 11 can be designed to satisfy a linear or nonlinear interpolation relationship with the temperature T2 of the sealed cavity 1. By designing it in the above manner, the temperature T1 control of the temperature T2 of the sealed cavity 1 becomes more flexible and intelligent.

[0103] To help those skilled in the art better understand the water removal method provided by this invention, please refer to... Figure 2 The detailed control logic diagram of the water removal method is shown below. The control scheme for the water removal method is described as follows:

[0104] Step S100: Input the monitoring temperature T1 of the heating device 2 and the monitoring temperature T2 of the ambient temperature inside the sealed cavity 1 to the power converter;

[0105] Step S200: Determine whether the power converter has switched from off-grid state to grid-connected state; if not, it indicates that the power converter has been either off-grid or grid-connected, and the first, second, third, and fourth fans are controlled according to the first preset control logic of the power converter; if yes, proceed to the next level of judgment.

[0106] Step S300: Determine if the monitored temperature T1 of power heating device 2 is greater than or equal to T 1-1 If the condition is met, then start the first fan 6 to cool the heatsink 4, and set the timer to T. 1-1 The starting temperature, T 1-2 To determine the temperature corresponding to full rotation speed, the relationship between the intermediate temperature T1 and the rotational speed of the first fan 6 is linearly or non-linearly interpolated. When temperature T1 exceeds the heat dissipation limit temperature T... 1-3 If the condition is met, the entire machine will be derated; otherwise, proceed to the next level of judgment.

[0107] Step S400: Determine if the ambient temperature monitoring temperature T2 ≥ T 3-1 If this condition is met, then the second fan 10 and the third fan 11 will rotate at full speed, the fourth fan 19 will start, and the speed will be T. 3-1 The starting temperature, T 3-2 To determine the temperature corresponding to full rotation speed, the relationship between the intermediate temperature T2 and the speed of the fourth fan 19 is linearly or non-linearly interpolated. When temperature T2 exceeds the heat dissipation limit temperature T... 3-3 If the condition is met, the entire machine will be derated; otherwise, proceed to the next level of judgment.

[0108] Step S500: Determine the ambient temperature (i.e., the internal ambient temperature) of the sealed cavity 1 by monitoring temperature T. 3-1 >T2≥T 2-1 If the condition is met, then the fourth fan 19 stops, the second fan 10 and the third fan 11 start, and the operation begins with a T-wave pattern. 2-1 The starting temperature, T 2-2To determine the temperature corresponding to full rotation speed, the relationship between the intermediate temperature T2 and the rotational speeds of the second fan 10 and the third fan 11 is linearly or nonlinearly interpolated, where T... 2-2 ≤T 3-1 If not, proceed to the next level;

[0109] Step S600: Control the second fan 10 and the third fan 11 to stop rotating, the first fan 6 to rotate forward, and the fourth fan 19 to rotate in reverse. After a certain period of time t1 (that is, the aforementioned preset time), all fans will stop rotating.

[0110] Furthermore, the present invention also provides a power converter, which includes the heat dissipation system described in any of the above-described solutions, and the water removal method described in any of the above-described solutions is used to control the heat dissipation system to perform water removal operation. Since the aforementioned heat dissipation system and water removal method both have the above-described technical effects, the power converter having the aforementioned heat dissipation system should also have the corresponding technical effects, which will not be elaborated further here.

[0111] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0112] As indicated in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "a," and / or "the" are not specifically singular and may include the plural. Generally, the terms "comprising" and "including" only indicate the inclusion of expressly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements. An element defined by the phrase "comprising an..." does not exclude the presence of other identical elements in the process, method, product, or apparatus that includes the element.

[0113] In the description of the embodiments of this application, unless otherwise stated, " / " means "or", for example, A / B can mean A or B; "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Furthermore, in the description of the embodiments of this application, "multiple" refers to two or more.

[0114] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0115] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A heat dissipation system applied to a power converter, characterized in that, include: The heat sink (4) includes a heat dissipation structure disposed on the outside of the sealed cavity (1) of the power converter and used to dissipate heat from the heat-generating device (2) inside the sealed cavity (1); External circulation air duct, used for air circulation with the external environment; An internal circulation air duct is used for air circulation with the airflow inside the sealed cavity (1); The fourth fan (19) is used to provide airflow circulation power for the external circulation duct; The external circulation duct and the internal circulation duct are not connected and heat exchange is achieved through a heat exchanger; at least part of the heat dissipation structure is located on the circulation path of the external circulation duct; the working mode of the fourth fan (19) includes at least a first working mode, and in the first working mode, the airflow circulation direction provided by the fourth fan (19) is the direction of flow from the heat dissipation structure to the heat exchanger, so as to transport part of the heat dissipation structure to the heat exchanger, and the heat exchanger can evaporate the condensate in the internal circulation duct through this part of the heat.

2. The heat dissipation system as described in claim 1, characterized in that, The fourth fan (19) also includes a second working mode, and in the second working mode, the airflow circulation direction provided by the fourth fan (19) is the direction of flow from the heat exchanger to the heat dissipation structure.

3. The heat dissipation system as described in claim 1, characterized in that, A portion of the external circulation duct is arranged inside the sealed cavity (1), and at least a portion of the heat exchanger is located inside the sealed cavity (1). And / or, a portion of the internal circulation duct is arranged outside the sealed cavity (1), and at least a portion of the heat exchanger is located outside the sealed cavity (1).

4. The heat dissipation system as described in claim 3, characterized in that, A portion of the external circulation air duct is arranged inside the sealed cavity (1), and the entire structure of the heat exchanger is located inside the sealed cavity (1); the external circulation air duct includes a first collection cavity (13), a heat dissipation tube assembly (14), a second collection cavity (12), a first air duct, and a second air duct (16). The first collection cavity (13), the heat dissipation tube assembly (14), and the second collection cavity (12) are connected sequentially from top to bottom inside the sealed cavity (1), and the heat dissipation tube assembly (14) constitutes the heat exchanger; the first air duct and the second air duct are arranged outside the sealed cavity (1), and the first air duct is used to connect the first collection cavity (13) with the external environment, and the second air duct (16) is used to connect the second collection cavity (12) with the external environment; The fourth fan (19) is disposed on the first air duct and / or the second air duct (16), and at least part of the heat dissipation structure is disposed on the flow path of the first air duct and / or the second air duct (16).

5. The heat dissipation system as described in claim 4, characterized in that, The sealed cavity (1) is provided with a second ventilation opening (17) for connecting the second collection cavity and the second air duct (16). The lower edge of the second ventilation opening (17) is not higher than the lower edge of the cavity wall of the second collection cavity and not lower than the lower edge of the cavity wall of the second air duct (16).

6. The heat dissipation system as described in claim 3, characterized in that, A portion of the internal circulation duct is arranged outside the sealed cavity (1), and the entire structure of the heat exchanger is located outside the sealed cavity (1); the sealed cavity (1) is provided with a ventilation outlet, and the portion of the internal circulation duct located outside the sealed cavity (1) is provided with an outer duct port for connecting with the ventilation outlet. Wherein, the lower edge of the ventilation outlet is not lower than the lower edge of the outer air duct port.

7. A water removal method for removing water from a power converter using a heat dissipation system as described in any one of claims 1-6, characterized in that, The water removal method includes: The current operating state of the power converter is obtained, and it is determined whether the current operating state is switching from off-grid state to grid-connected state; if not, the heat dissipation system is controlled to perform heat dissipation operation according to the first preset control logic; if yes, proceed to the next step. Determine whether the power converter is in a state requiring heat dissipation. If yes, control the heat dissipation system to perform heat dissipation operation according to the first preset control logic. If no, proceed to the next step. The heat dissipation system is controlled to heat and evaporate water from the internal circulation duct according to the second preset control logic and operate continuously for a preset duration. The second preset control logic includes at least controlling the fourth fan (19) to operate in the first working mode.

8. The water removal method as described in claim 7, characterized in that, The water removal method determines whether the power converter is in a state requiring heat dissipation in the following manner: When the operating parameters of the power converter meet at least one of the first and second conditions, the power converter is in a state requiring heat dissipation. The first condition is T1≥T 1-1 The second condition is T2≥T 2-1 T1 is the current operating temperature of the heating device (2), T2 is the current ambient temperature inside the sealed cavity (1), and T 1-1 The temperature is set according to the heat dissipation requirements of the heat-generating device (2); T 2-1 The temperature is set according to the heat dissipation requirements of the sealed cavity (1).

9. The water removal method as described in claim 7, characterized in that, The heat dissipation system further includes a first fan (6) disposed on the heat dissipation structure. The first fan (6) is used to provide power for the external ambient airflow to flow through the heat dissipation structure, so that at least part of the airflow flowing through the heat dissipation structure merges into the external circulation air duct. The second preset control logic also includes controlling the rotation of the first fan (6).

10. The water removal method as described in claim 7, characterized in that, The heat dissipation system further includes a second fan (10) and a third fan (11). The second fan (10) is disposed in the sealed cavity (1) and is used to disturb the airflow in the sealed cavity (1). The third fan (11) is disposed in the sealed cavity (1) and is used to provide power for the airflow circulation of the internal circulation duct.

11. The water removal method as described in claim 10, characterized in that, The second preset control logic also includes controlling the second fan (10) and the third fan (11) to stop rotating.

12. The water removal method as described in claim 10, characterized in that, The internal circulation duct has ventilation openings arranged facing and close to the inner wall of the sealed cavity (1); The second preset control logic also includes controlling the rotation of the third fan (11), and the airflow circulation power provided by the third fan (11) is configured to be sent from the vent to the inner wall of the sealed cavity (1).

13. The water removal method as described in claim 12, characterized in that, A water-absorbing structure is provided on the cavity wall of the sealed cavity (1) in the area corresponding to the vent. And / or, the internal circulation duct is provided with a water absorption structure.

14. The water removal method as described in claim 8, characterized in that, The heat dissipation system further includes a first fan (6), a second fan (10), and a third fan (11), wherein the first fan (6) is disposed in the heat dissipation structure and is used to provide power for the airflow of the external environment through the heat dissipation structure, so that at least part of the airflow flowing through the heat dissipation structure merges into the external circulation duct; the second fan (10) is disposed in the sealed cavity (1) and is used to disturb the airflow in the sealed cavity (1); the third fan (11) is disposed in the sealed cavity (1) and is used to provide power for the airflow circulation in the internal circulation duct; The first preset control logic includes: When T 1-3 >T1≥T 1-1 At that time, control the first fan (6) to rotate; When T1≥T 1-3 At that time, the power converter is controlled to undergo overall derating. Among them, T 1-3 The heat dissipation limit temperature of the heat-generating device (2) is T. 1-3 >T 1-1 The temperature T1 of the heating device (2) and the rotational speed of the first fan (6) satisfy a linear or nonlinear interpolation relationship, wherein T 1-1 The starting temperature of the first fan (6) is configured as T. 1-2 The temperature is configured as the full-speed temperature of the first fan (6), and T 1-3 >T 1-2 >T 1-1 ; And / or, the first preset control logic includes: When T 3-3 >T2≥T 3-1 At that time, the second fan (10) and the third fan (11) are controlled to rotate at full speed, the fourth fan (19) starts to rotate, and the speed of T2 and the speed of the fourth fan (19) satisfy a linear or nonlinear interpolation relationship; When T2≥T 3-3 At that time, the power converter is controlled to undergo overall derating. When T 3-1 >T2≥T 2-1 When the fourth fan (19) stops rotating, the second fan (10) and the third fan (11) start rotating, and the rotation speeds of the second fan (10) and the third fan (11) satisfy a linear or nonlinear interpolation relationship with T2. Among them, T 2-1 The starting temperature T is configured as the starting temperature of the second fan (10) and the third fan (11). 2-2 The full-speed temperature T of the second fan (10) and the third fan (11) is configured as follows. 3-1 The starting temperature of the fourth fan (19) is configured as T. 3-2 The full-speed temperature T of the fourth fan (19) is configured as follows. 3-3 The heat dissipation limit temperature of the sealed cavity (1) is configured as T. 3-3 >T 3-2 >T 3-1 ≥T 2-2 >T 2-1 .

15. A power converter, characterized in that, The power converter includes a heat dissipation system as described in any one of claims 1-6, and the heat dissipation system is controlled to perform a water removal operation using a water removal method as described in any one of claims 7-14.

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