Method for formulating charger cooling system and speed regulation strategy

Abstract

A charger heat dissipation system and a method for formulating a speed regulation strategy thereof, the charger heat dissipation system comprising an air duct, a rectifier module and an exhaust fan; the air duct has an air inlet and an air outlet; the rectifier module and the exhaust fan are located in the air duct, the rectifier module comprises at least one rectifier module, the peripheral wall of the rectifier module is in contact with the inner wall of the air duct; further comprising: a detection component for obtaining the current working parameters of the rectifier module; a controller, which is in communication connection with the detection component, the controller pre-stores a duty cycle characteristic function of the exhaust fan, the controller determines the speed of the exhaust fan according to the current working parameters and the duty cycle characteristic function, and sends a control signal corresponding to the speed to the exhaust fan. Through structural optimization, the speed of the exhaust fan can be adjusted in real time according to the working conditions of the charger's rectifier module, which effectively reduces power consumption and improves noise problems.

Description

Technical Field

[0001] The present invention relates to the technical field of heat dissipation of chargers, and in particular to a heat dissipation system of a charger and a method for formulating a speed regulation strategy thereof. Background Art

[0002] When the charger of an electric vehicle is working, the rectifier module of the charger will generate a lot of heat. To ensure that the equipment is not damaged, the rectifier module needs to be cooled.

[0003] The existing heat dissipation method for the rectifier module is to place the rectifier module in the air duct, and set up protective components at the inlet and outlet of the air duct. The built-in fan of the rectifier module can adjust the speed according to the ambient temperature, load and other conditions to dissipate the heat of the rectifier module. Due to the setting of the protective components at the inlet and outlet of the air duct, the heat dissipation ventilation volume will be reduced. Generally, an exhaust fan is added to the air duct to compensate for the wind resistance loss caused by the protective components.

[0004] However, when configuring the exhaust fan of the existing charger, the exhaust fan is mostly configured according to the maximum ventilation requirement of the rectifier module, and the speed of the exhaust fan cannot be adjusted according to the actual ventilation volume required by the rectifier module, which leads to the problems of high power consumption and high noise in the existing heat dissipation system. Summary of the invention

[0005] The purpose of the present invention is to provide a charger heat dissipation system and a method for formulating a speed regulation strategy thereof. The charger heat dissipation system can adjust the speed of the exhaust fan in real time according to the working condition of the charger's rectifier module through structural optimization, thereby effectively reducing power consumption and improving noise problems.

[0006] In order to solve the above technical problems, the present invention provides a charger heat dissipation system, comprising an air duct, a rectifier module and an exhaust fan; the air duct has an air inlet and an air outlet; the rectifier module is located in the air duct, the rectifier module includes at least one rectifier module, and the peripheral wall of the rectifier module is in contact with the inner wall of the air duct; the exhaust fan is also located in the air duct; and further comprises:

[0007] A detection component, used to obtain the current working parameters of the rectifier module;

[0008] a controller, which is in communication with the detection component, wherein the controller pre-stores a duty cycle characteristic function of the exhaust fan, and the controller determines the rotation speed of the exhaust fan according to the current working parameters and the duty cycle characteristic function, and sends a control signal corresponding to the rotation speed to the exhaust fan;

[0009] The duty cycle characteristic function is a function with the duty cycle of the exhaust fan as the dependent variable and the working parameters of the rectifier module as the independent variable.

[0010] The charger heat dissipation system provided by the present invention is provided with a detection component and a controller. The detection component can be used to obtain the working parameter information of the rectifier module. The duty cycle characteristic function of the exhaust fan is pre-stored in the controller. When the charger is actually working, the controller can determine the rotation speed of the exhaust fan according to the current working parameters of the rectifier module and the duty cycle characteristic function of the exhaust fan, and control the exhaust fan to work according to the determined rotation speed. In this way, the rotation speed of the exhaust fan can be adjusted according to the actual working conditions of the charger to avoid the exhaust fan always being in a full speed operating state, which effectively reduces power consumption and improves noise problems.

[0011] In the charger heat dissipation system as described above, the operating parameters of the rectifier module include load information and ambient temperature.

[0012] In the charger heat dissipation system as described above, the detection component includes a temperature sensor, and the temperature sensor is located in the air duct and between the air inlet and the rectifier module, or the temperature sensor is located outside the air duct and away from the air outlet.

[0013] In the charger heat dissipation system as described above, the exhaust fan is located between the rectifier module and the air outlet, or the exhaust fan is located between the air inlet and the rectifier module.

[0014] In the charger heat dissipation system as described above, the rectifier module has a built-in fan, and when the built-in fans and the exhaust fan are in full-speed operation, the air pressure at the front end of the rectifier module is not less than the air pressure at the rear end of the rectifier module.

[0015] In the charger heat dissipation system as described above, the load information includes at least one of the working quantity of the rectifier module, the power of the rectifier module, and the current and voltage of the rectifier module.

[0016] In the charger heat dissipation system as described above, the duty cycle characteristic function is determined by the duty cycle characteristic table of the exhaust fan, and the duty cycle characteristic table of the exhaust fan is a correspondence table between the duty cycle of the exhaust fan and the working parameters of the rectifier module.

[0017] In the charger heat dissipation system as described above, the rectifier module is only equipped with one rectifier module, and the duty cycle characteristic table of the exhaust fan is determined based on the condition that the air pressure value at the front end of the rectifier module is not less than the air pressure value at the rear end of the rectifier module, according to the duty cycle characteristic table of the built-in fan of the rectifier module.

[0018] In the charger heat dissipation system as described above, the rectifier module is provided with more than two rectifier modules, and the duty cycle characteristic table of the exhaust fan is subject to the condition that the air pressure value at the front end of the rectifier module is not less than the air pressure value at the rear end of the rectifier module, and is determined according to the working number of the rectifier module, the maximum load of the rectifier module and the ambient temperature.

[0019] In the charger heat dissipation system as described above, the duty cycle characteristic function is obtained by using an interpolation fitting calculation method according to the duty cycle characteristic table of the exhaust fan.

[0020] The present invention also provides a method for formulating a speed regulation strategy for a charger heat dissipation system, wherein the charger heat dissipation system comprises an air duct, a rectifier module and an exhaust fan; the rectifier module and the exhaust fan are both located in the air duct, the rectifier module comprises at least one rectifier module, and the peripheral wall of the rectifier module is in contact with the inner wall of the air duct; the speed regulation strategy formulating method comprises:

[0021] Determine a duty cycle characteristic function of the exhaust fan, wherein the duty cycle characteristic function is a function with the duty cycle of the exhaust fan as a dependent variable and the working parameters of the rectifier module as an independent variable;

[0022] The rotation speed of the exhaust fan is adjusted according to the current operating parameters of the rectifier module and the duty cycle characteristic function.

[0023] This speed regulation strategy formulation method is used for the charger cooling system. By determining the duty cycle characteristic function of the exhaust fan and combining it with the actual working conditions of the charger, the speed of the exhaust fan is adjusted to avoid the exhaust fan always being in the full speed operating state, which effectively reduces power consumption and improves noise problems.

[0024] In the speed regulation strategy formulation method as described above, the duty cycle characteristic function is determined by the duty cycle characteristic table of the exhaust fan, and the duty cycle characteristic table of the exhaust fan is a correspondence table between the duty cycle of the exhaust fan and the working parameters of the rectifier module.

[0025] In the speed regulation strategy formulation method as described above, the rectifier module is only provided with one rectifier module, and the duty cycle characteristic table of the exhaust fan is determined according to the duty cycle characteristic table of the built-in fan of the rectifier module, on the condition that the air pressure value at the front end of the rectifier module is not less than the air pressure value at the rear end of the rectifier module;

[0026] or,

[0027] The rectifier module is provided with more than two rectifier modules, and the duty cycle characteristic table of the exhaust fan is subject to the condition that the air pressure value at the front end of the rectifier module is not less than the air pressure value at the rear end of the rectifier module, and is determined according to the working number of the rectifier modules, the maximum load of the rectifier modules and the ambient temperature.

[0028] In the speed regulation strategy formulation method as described above, the duty cycle characteristic function is obtained by using an interpolation fitting calculation method based on the duty cycle characteristic table of the exhaust fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A simplified structural diagram of an implementation of a charger heat dissipation system provided by the present invention;

[0030] Figure 2 for Figure 1 The control principle diagram of the charger cooling system is shown;

[0031] Figure 3 The duty cycle characteristic table of a built-in fan of a rectifier module is shown;

[0032] Figure 4 The duty cycle characteristic table of the exhaust fan is shown;

[0033] Figure 5 A simplified structural diagram of another embodiment of the charger heat dissipation system provided by the present invention;

[0034] Figure 6 A simplified structural diagram of another embodiment of the charger heat dissipation system provided by the present invention;

[0035] Figure 7 A logic diagram of a duty cycle characteristic function for determining an exhaust fan in the speed regulation strategy formulation method provided by the present invention.

[0036] Description of reference numerals:

[0037] Air duct 11 , air inlet protection component 111 , air outlet protection component 112 , rectifier module 12 , built-in fan 121 , exhaust fan 13 , controller 14 , temperature sensor 15 . DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0039] Please refer to Figure 1 , Figure 1 The present invention provides a simplified structural diagram of a charger heat dissipation system according to an embodiment of the present invention.

[0040] In this embodiment, the charger heat dissipation system includes an air duct 11, a rectifier module and an exhaust fan 13. The air duct 11 has an air inlet and an air outlet. The rectifier module and the exhaust fan 13 are both located in the air duct 11. According to the application requirements of the charger, its rectifier module may include one rectifier module 12 or more than two rectifier modules 12. Here, one rectifier module 12 is used as an example for illustration.

[0041] Typically, an air inlet protection component 111 is provided at the air inlet of the air duct 11, and an air outlet protection component 112 is provided at the air outlet of the air duct 11. The provision of the protection component is conducive to preventing debris outside the air duct 11 from entering the interior of the air duct 11, affecting the normal operation of the rectifier module 12 and the exhaust fan 13. The air inlet protection component 111 and the air outlet protection component 112 may both include a filter, and may also be provided with a rainproof structure. The rainproof structure and the filter may both adopt existing structures, which will not be described in detail here. Of course, in other embodiments, the air inlet protection component 111 may not be provided at the air inlet of the air duct 11, and the air outlet protection component 112 may not be provided at the air outlet, or a protection component may be provided at only one of the air inlet and the air outlet, which is determined according to specific needs.

[0042] The peripheral wall of the rectifier module 12 is in contact with the inner wall of the air duct 11 , so that the heat dissipation air entering from the air inlet of the air duct 11 can only pass through the rectifier module 12 and then be discharged from the air outlet.

[0043] The air duct 11 is a relatively closed structure, and except for the air inlet and the air outlet, the rest of the parts are sealed to ensure the heat dissipation effect of the rectifier module 12. The specific shape and sealing structure of the air duct 11 can be realized by referring to the existing design, which is not the core invention of this article and will not be described in detail.

[0044] The exhaust fan 13 can compensate for the wind resistance caused by the air inlet protection component 111 and the air outlet protection component 112. In this embodiment, the exhaust fan 13 is arranged between the rectifier module 12 and the air outlet, that is, the exhaust fan 13 is closer to the air outlet relative to the rectifier module 12.

[0045] In this embodiment, the charger heat dissipation system also includes a detection component and a controller 14, wherein the detection component is used to obtain the current working parameters of the rectifier module. In this embodiment, since the rectifier module is only equipped with one rectifier module 12, the detection component actually obtains the current working parameters of the rectifier module 12.

[0046] The controller 14 is communicatively connected with the detection component, and the detection component can feed back the detected working parameter information to the controller 14; the controller 14 pre-stores the duty cycle characteristic function of the exhaust fan 13, and the duty cycle characteristic function is a function with the duty cycle of the exhaust fan as the dependent variable and the working parameters of the rectifier module as the independent variable; the controller 14 can determine the rotation speed of the exhaust fan 13 according to the current working parameters fed back by the detection component and the pre-stored duty cycle characteristic function, and send a control signal corresponding to the rotation speed to the exhaust fan 13, that is, the controller 14 can adjust the rotation speed of the exhaust fan 13 in real time according to the current working parameters.

[0047] Here, the duty cycle of the exhaust fan 13 is defined as the ratio of the actual speed of the fan to the maximum speed. Obviously, the smaller the duty cycle, the smaller the speed of the exhaust fan 13, and the larger the duty cycle, the greater the speed of the exhaust fan 13.

[0048] When the charger cooling system provided in this embodiment is actually working, the controller can determine the current required speed of the exhaust fan 13 according to the current working parameters of the charger's rectifier module combined with the duty cycle characteristic function of the exhaust fan 13, and use this to control the operation of the exhaust fan 13, that is, through control, the operating speed of the exhaust fan 13 meets the current demand of the charger cooling system. In other words, the operating speed of the exhaust fan 13 can be adjusted in real time according to actual needs. Compared with the existing exhaust fan 13 always operating at full speed, that is, the maximum speed, it can effectively reduce power consumption and improve the noise problem of the charger cooling system.

[0049] In the specific scheme, the working parameters of the aforementioned rectifier module include load information and ambient temperature. Generally speaking, the heat dissipation requirement of the rectifier module is related to its workload and ambient temperature. These two parameters are also easy to obtain, and the speed control of the exhaust fan 13 can be achieved relatively easily. It can be understood that, on this basis, the dependent variables of the duty cycle characteristic function of the aforementioned exhaust fan 13 include the load information and ambient temperature of the rectifier module.

[0050] Please refer to Figure 2 , Figure 2 for Figure 1 Schematic diagram of the control principle of the charger cooling system.

[0051] like Figure 2As shown, the duty cycle characteristic function b=f(load, T) of the exhaust fan 13 can be written into the controller 14 in advance. When working, the load information load and the ambient temperature T of the rectifier module 12 can be sent to the controller 14. The controller 14 can determine the duty cycle b of the exhaust fan 13 based on the received load information load and the ambient temperature T in combination with the duty cycle characteristic function b=f(load, T), and then determine the required working speed of the exhaust fan 13 based on the maximum speed of the exhaust fan 13 (a known parameter when the exhaust fan 13 is determined), thereby controlling the exhaust fan 13 to operate at the required speed.

[0052] In practical applications, the load information of the rectifier module can be obtained through the master control of the charger system. It can be understood that the detection component includes the existing detection element of the charger system, which can obtain the load information of the rectifier module.

[0053] In a specific solution, the load information of the rectifier module includes at least one of the working number of the rectifier module 12 , the power of the rectifier module 12 , and the current and voltage of the rectifier module 12 .

[0054] In this embodiment, the rectifier module has only one rectifier module 12 . At this time, the load information of the rectifier module can be represented by the power or current and voltage of the rectifier module 12 .

[0055] In other embodiments, if the rectifier module has more than two rectifier modules 12, the load information of the rectifier module can be determined by the number of working rectifier modules 12, and also combined with the power or current voltage of the working rectifier modules 12; on the basis of taking into account the cost and control requirements, the load information of the rectifier module can only refer to the number of working rectifier modules 12, combined with the maximum load value of the rectifier module 12 to determine the load information, that is, the load information of the rectifier module can be simplified to the product of the number of working rectifier modules 12 and the maximum load of the rectifier module 12. Of course, without considering the cost and achieving relatively precise control, the actual output load of the rectifier module can be used as the load information.

[0056] In this embodiment, the detection component includes a temperature sensor 15, and the ambient temperature information is obtained through the temperature sensor 15. Figure 1 As shown, the temperature sensor 15 is specifically arranged inside the air duct 11 near the air inlet.

[0057] Generally speaking, the rectifier module 12 has a built-in fan 121. In this embodiment, when the built-in fan 121 and the exhaust fan 13 of the rectifier module 12 are both in full-speed operation, the air pressure value P1 at the front end of the rectifier module 12 is not less than the air pressure value P2 at the rear end of the rectifier module 12. Here, the front end of the rectifier module 12 is near the air inlet, and the rear end of the rectifier module 12 is near the air outlet. This arrangement ensures that when the rectifier module 12 is working at the maximum load, the exhaust fan 13 can meet its heat dissipation requirements, avoiding wind resistance losses caused by the air inlet protection component 111 and the air outlet protection component 112.

[0058] It can be understood that in other embodiments, when the rectifier module is provided with more than two rectifier modules 12, the exhaust fan 13 should be selected based on the condition that all built-in fans 121 and exhaust fans 13 are in full speed operation and the air pressure value at the front end of the rectifier module is not less than the air pressure value at the rear end. Obviously, the front end and the rear end of the rectifier module here refer to the position of the rectifier module as a whole close to the air inlet and the position close to the air outlet, respectively.

[0059] In a specific scheme, the duty cycle characteristic function of the exhaust fan 13 can be determined by the duty cycle characteristic table of the exhaust fan 13, which is a correspondence table between the duty cycle of the exhaust fan 13 and the working parameters of the rectifier module. In other words, the duty cycle characteristic table of the exhaust fan 13 is a correspondence table between the independent variable and the dependent variable of the duty cycle characteristic function of the exhaust fan 13.

[0060] In this embodiment, the rectifier module is only provided with one rectifier module 12 , and this is taken as an example to illustrate the method for determining the duty cycle characteristic function of the exhaust fan 13 .

[0061] For the rectifier module 12, the duty cycle characteristic table of its built-in fan 121 is known, that is, the built-in fan 121 of the existing rectifier module 12 can adjust the duty cycle according to the actual working conditions, thereby adjusting the exhaust volume of the built-in fan 121. Here, the definition of the duty cycle of the built-in fan 121 is the same as the duty cycle of the aforementioned exhaust fan 13, that is, the duty cycle of the built-in fan 121 is the ratio of the actual rotation speed of the built-in fan 121 to the maximum rotation speed.

[0062] The duty cycle characteristic table a~(Load, T) of the built-in fan 121 of the rectifier module 12 can be referred to Figure 3 It is understood that here a represents the duty cycle of the built-in fan 121, Load represents the output load of the rectifier module 12, and T represents the ambient temperature.

[0063] like Figure 3As shown, under the same output load, the built-in fan 121 of the rectifier module 12 has different duty cycles depending on the ambient temperature. Under the same ambient temperature, the built-in fan 121 of the rectifier module 12 also has different duty cycles depending on the output load. In general, for a certain output load and a certain ambient temperature, the duty cycle of the built-in fan 121 of the rectifier module 12 is determined.

[0064] Figure 3 The figure only shows the duty cycle a of the built-in fan 121 corresponding to the case where the output load has four parameters and the ambient temperature has four parameters. In practical applications, the duty cycle characteristic table a~(Load, T) of the built-in fan 121 can be provided by the manufacturer, or obtained through experiments.

[0065] The duty cycle characteristic table b~(Load, T) of the exhaust fan 13 can be obtained according to the duty cycle characteristic table of the built-in fan 121 of the rectifier module 12, under the condition that the air pressure value P1 at the front end of the rectifier module 12 is not less than the air pressure value P2 at the rear end of the rectifier module 12.

[0066] It can be understood that when the air pressure value P1 at the front end of the rectifier module 12 is equal to the air pressure value P2 at the rear end of the rectifier module 12, the wind resistance brought to the air duct 11 by the air inlet protection component 111 and the air outlet protection component 112 is eliminated, which is equivalent to creating a relatively developed operating environment for the rectifier module 12. For the rectifier module 12, there is no pressure drop between its front and rear ends, and the built-in fan 121 will not be affected by wind resistance. When the air pressure value P1 at the front end of the rectifier module 12 is greater than the air pressure value P2 at the rear end of the rectifier module 12, the same effect can be achieved. At this time, the air volume provided by the charger is greater than the air volume required by the rectifier module 12, but it will not cause insufficient air supply and affect the heat dissipation effect of the rectifier module 12.

[0067] Please refer to Figure 3 and Figure 4 Specifically, the duty cycle characteristic table b~(Load, T) of the exhaust fan 13 can be determined according to the duty cycle characteristic table a~(Load, T) of the built-in fan 121. The output load of the built-in fan 121 is first set to the working condition of Load1, the ambient temperature is adjusted to T1, and then the duty cycle of the exhaust fan 13 is adjusted. When the air pressure value P1 at the front end of the rectifier module 12 is equal to the air pressure value P2 at the rear end, the duty cycle b of the exhaust fan 13 is determined. 11 Corresponding to the output load Load1 and the ambient temperature T1, the duty cycle of the exhaust fan 13 under different output loads and ambient temperatures in the duty cycle characteristic table a~(Load, T) of the built-in fan 121 can be obtained one by one, thereby obtaining Figure 4 The duty cycle characteristic table b~(Load, T) of the exhaust fan 13 is shown.

[0068] During this process, the air pressure values ​​P1 and P2 can be determined by arranging barometers at the front and rear ends of the rectifier module 12 respectively, and the exhaust fan 13 and the built-in fan 121 can be connected through a host computer to adjust the duty cycle of the two. Of course, the connection of these devices should not affect the sealing of the air duct 11, so as not to affect the accuracy of the obtained results.

[0069] If the air pressure value P1 at the front end of the rectifier module 12 is greater than the air pressure value P2 at the rear end, the method remains the same as above.

[0070] After determining the duty cycle characteristic table b~(Load, T) of the exhaust fan 13, the duty cycle characteristic function b=f(Load, T) of the exhaust fan 13 can be determined through the table, for example, by using interpolation fitting calculation or other mathematical calculation methods.

[0071] In other embodiments, when the rectifier module is provided with more than two rectifier modules 12, the corresponding tables of the load conditions and the ambient temperature increase due to the increase in the number of rectifier modules 12, such as the load conditions including the number of working rectifier modules 12, the different output loads of the working rectifier modules 12, etc. At this time, in order to facilitate the acquisition of the duty cycle characteristic function of the exhaust fan 13, the duty cycle characteristic table of the exhaust fan 13 can be determined according to the number of working rectifier modules 12, the maximum load of the rectifier module 12 and the ambient temperature. Of course, the prerequisite is that the air pressure value at the front end of the rectifier module is not less than the air pressure value at the rear end. Although the duty cycle characteristic function of the exhaust fan 13 obtained in this way has poor fitting, it can also achieve real-time adjustment of the duty cycle of the exhaust fan 13 according to the working conditions of the rectifier module.

[0072] Of course, for precise control, the duty cycle characteristic table of the rectifier module may be determined first, and then the duty cycle characteristic table of the exhaust fan 3 may be determined accordingly. The specific determination method may refer to the above understanding and will not be described one by one.

[0073] Please refer to Figure 5 , Figure 5 This is a simplified structural diagram of another embodiment of the charger heat dissipation system provided by the present invention.

[0074] Figure 5 The charger cooling system shown is similar to the above Figure 1 Compared with the charger cooling system shown in the figure, the structure is basically the same. The difference between the two is: Figure 5 In the example shown, the temperature sensor 15 for measuring the ambient temperature is arranged outside the air duct 11 and away from the air outlet. The figure is only an example. In actual application, the temperature sensor 15 can be located at any position outside the air duct 11 where the ambient temperature can be detected.

[0075] In addition to the location of the temperature sensor 15, Figure 5 Other configurations of the charger cooling system shown can be understood by referring to the description of the aforementioned embodiment and will not be repeated here.

[0076] Please refer to Figure 6 , Figure 6 This is a simplified structural diagram of another embodiment of the charger heat dissipation system provided by the present invention.

[0077] Figure 6 The charger cooling system shown is similar to the above Figure 1 Compared with the charger cooling system shown in the figure, the structure is basically the same. The difference between the two is: Figure 6 In the example shown, the exhaust fan 13 is arranged between the rectifier module 12 and the air inlet of the air duct 11, that is, the exhaust fan 13 is closer to the air inlet of the air duct 11 relative to the rectifier module 12. At this time, in the method of determining the duty cycle characteristic function of the exhaust fan 13, the position for obtaining the air pressure value at the front end of the rectifier module 12 is between the rectifier module 12 and the exhaust fan 13.

[0078] In addition to the location of the exhaust fan 13, Figure 5 Other configurations of the charger cooling system shown can be understood by referring to the description of the aforementioned embodiment and will not be repeated here.

[0079] exist Figure 5 and Figure 6 In the example shown, the rectifier module is still only one rectifier module 12 as an example. It can be understood that Figure 5 and Figure 6 In the embodiment, the rectifier module may also have more than two rectifier modules 12.

[0080] In addition to the above charger heat dissipation system, the present invention also provides a speed regulation strategy formulation method for the charger heat dissipation system, wherein the structure of the charger heat dissipation system is similar to the above structure and will not be repeated. The speed regulation strategy formulation method includes:

[0081] Determine a duty cycle characteristic function of the exhaust fan, wherein the duty cycle characteristic function is a function with the duty cycle of the exhaust fan as a dependent variable and the working parameters of the rectifier module as an independent variable;

[0082] The rotation speed of the exhaust fan is adjusted according to the current operating parameters of the rectifier module and the duty cycle characteristic function.

[0083] Among them, the method for determining the duty cycle characteristic function of the exhaust fan can refer to Figure 7 The above is the understanding shown. At the same time, the above article has explained in detail the charger cooling system, so it will not be repeated here.

[0084] It should be pointed out that Figure 7The duty cycle characteristics of the built-in fan of the rectifier module involved in the table a~(Load, T) can be referred to Figure 3 For understanding, the duty cycle characteristics of the charging pile exhaust fan can be found in Table b~(Load, T) Figure 4 Understanding, the relevant parameter characterization is consistent with the previous text, Figure 7 In the figure, it is taken that the air pressure value P1 at the front end of the rectifier module 12 is equal to the air pressure value P2 at the rear end. In actual application, it can also be a condition that P1 is greater than P2.

[0085] The above is a detailed introduction to a charger heat dissipation system and a speed regulation strategy formulation method provided by the present invention. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A charger heat dissipation system, comprising an air duct, a rectifier module and an exhaust fan; the air duct has an air inlet and an air outlet; the rectifier module is located in the air duct, the rectifier module includes at least one rectifier module, and the peripheral wall of the rectifier module is in contact with the inner wall of the air duct; the exhaust fan is also located in the air duct; characterized in that, Also includes: A detection component, used to obtain the current working parameters of the rectifier module; the working parameters of the rectifier module are load information and ambient temperature; the load information includes at least one of the working number of the rectifier module, the power of the rectifier module and the current and voltage of the rectifier module; a controller, which is in communication with the detection component, wherein the controller pre-stores a duty cycle characteristic function of the exhaust fan, and the controller determines the rotation speed of the exhaust fan according to the current working parameters and the duty cycle characteristic function, and sends a control signal corresponding to the rotation speed to the exhaust fan; Wherein, the duty cycle characteristic function is a function with the duty cycle of the exhaust fan as the dependent variable and the working parameter of the rectifier module as the independent variable; The rectifier module has a built-in fan, and when each of the built-in fans and the exhaust fan is in full-speed operation, the air pressure value at the front end of the rectifier module is not less than the air pressure value at the rear end of the rectifier module; The duty cycle characteristic function is determined by the duty cycle characteristic table of the exhaust fan, which is a correspondence table between the duty cycle of the exhaust fan and the working parameters of the rectifier module; The rectifier module is provided with only one rectifier module, and the duty cycle characteristic table of the exhaust fan is determined according to the duty cycle characteristic table of the built-in fan of the rectifier module, subject to the condition that the air pressure value at the front end of the rectifier module is not less than the air pressure value at the rear end of the rectifier module; or, the rectifier module is provided with more than two rectifier modules, and the duty cycle characteristic table of the exhaust fan is determined according to the working number of the rectifier module, the maximum load of the rectifier module and the ambient temperature, subject to the condition that the air pressure value at the front end of the rectifier module is not less than the air pressure value at the rear end of the rectifier module.

2. The charger heat dissipation system according to claim 1, characterized in that: The detection component includes a temperature sensor, which is located in the air duct and between the air inlet and the rectifier module, or the temperature sensor is located outside the air duct and away from the air outlet.

3. The charger heat dissipation system according to claim 1, characterized in that: The exhaust fan is located between the rectifier module and the air outlet, or the exhaust fan is located between the air inlet and the rectifier module.

4. The charger heat dissipation system according to any one of claims 1 to 3, characterized in that: The duty cycle characteristic function is obtained by using an interpolation fitting calculation method according to the duty cycle characteristic table of the exhaust fan.

5. A method for formulating a speed regulation strategy for a charger heat dissipation system, wherein the charger heat dissipation system comprises an air duct, a rectifier module and an exhaust fan; the rectifier module and the exhaust fan are both located in the air duct, the rectifier module comprises at least one rectifier module, and the peripheral wall of the rectifier module is in contact with the inner wall of the air duct; characterized in that: The speed regulation strategy formulation method comprises: Determine a duty cycle characteristic function of the exhaust fan, wherein the duty cycle characteristic function is a function with the duty cycle of the exhaust fan as a dependent variable and the working parameters of the rectifier module as an independent variable; the working parameters of the rectifier module are load information and ambient temperature; the load information includes at least one of the working number of the rectifier module, the power of the rectifier module, and the current and voltage of the rectifier module; adjust the speed of the exhaust fan according to the current working parameters of the rectifier module and the duty cycle characteristic function; The rectifier module is provided with only one rectifier module, and the duty cycle characteristic table of the exhaust fan is determined according to the duty cycle characteristic table of the built-in fan of the rectifier module, on the condition that the air pressure value at the front end of the rectifier module is not less than the air pressure value at the rear end of the rectifier module; or, The rectifier module is provided with more than two rectifier modules, and the duty cycle characteristic table of the exhaust fan is subject to the condition that the air pressure value at the front end of the rectifier module is not less than the air pressure value at the rear end of the rectifier module, and is determined according to the working number of the rectifier modules, the maximum load of the rectifier modules and the ambient temperature.

6. The speed regulation strategy formulation method according to claim 5, characterized in that: The duty cycle characteristic function is determined by a duty cycle characteristic table of the exhaust fan, and the duty cycle characteristic table of the exhaust fan is a correspondence table between the duty cycle of the exhaust fan and the working parameters of the rectifier module.

7. The speed regulation strategy formulation method according to claim 5 or 6, characterized in that: The duty cycle characteristic function is obtained by using an interpolation fitting calculation method according to the duty cycle characteristic table of the exhaust fan.

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