Method and device for controlling cooling fan of charging pile based on PID (Proportion Integration Differentiation) algorithm

Abstract

The invention discloses a charging pile cooling fan control method and device based on a PID algorithm, and belongs to the technical field of power systems, and the method comprises the following steps: S1, collecting the temperature of a first power module and the temperature of a second power module; s2, the size relation between the temperature of the first power module and the first target temperature and the size relation between the temperature of the second power module and the first target temperature are judged, and whether S3 or S5 is executed is determined according to the judgment result; s3, the first target temperature serves as a target value, the rotating speed of a fan is calculated through a PID algorithm, and the fan is controlled to operate at the rotating speed till the temperature of the module A is in the decreasing trend; s4, reducing the target value, calculating the rotating speed of the fan based on the reduced target value, and controlling the fan to operate at the rotating speed until the temperature of the module A is continuously smaller than or equal to the final target temperature within the set time; s5, whether the temperature of the first power module and the temperature of the second power module are both larger than the first target temperature or not is judged, and corresponding measures are taken according to the judgment result; according to the invention, the use performance of the power module is optimized.

Description

Technical Field

[0001] The present invention belongs to the technical field of power systems, and particularly relates to a control method and device for a charging pile cooling fan based on a PID algorithm. Background Art

[0002] With the gradual maturity of the new energy vehicle industry and the gradual expansion of market demand, new energy vehicle charging technology has received increasing attention. In particular, high-power direct current, which affects the charging speed, has become the trend of the industry's development. At present, the cooling systems of high-power direct current charging piles in the market are divided into natural cooling and liquid cooling. Both have their own advantages and disadvantages. The liquid cooling method can maintain the best performance of the module and the smallest possible noise, but it is expensive. Natural cooling has the disadvantages of poor heat dissipation performance, high noise, and high power consumption. Therefore, how to ensure the balance of heat dissipation, noise, and power consumption for the natural cooling system is a major problem in the charging pile industry. Summary of the Invention

[0003] The present invention provides a control method and device for a charging pile cooling fan based on a PID algorithm, which optimizes the performance and power consumption of the charging module and solves the problem of working noise of the charging pile.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions: In the first aspect, the present invention provides a control method for a charging pile cooling fan based on a PID algorithm, including the following steps: S1. For each fan, collect the temperature of the corresponding first power module and the temperature of the second power module; S2. Independently execute the following judgment for each fan: Judge the magnitude relationship between the temperature of the first power module, the temperature of the second power module, and the first target temperature: If the temperature of only one power module is greater than or equal to the first target temperature, denote the power module with a temperature greater than or equal to the first target temperature as module A, and execute S3; otherwise, jump to S5; S3. Take the first target temperature as the target value; based on the target value, use the PID algorithm to calculate the corresponding fan speed and control the fan to operate at this speed until the temperature of module A shows a downward trend; S4. Reduce the target value by a set step size, calculate the fan speed based on the reduced target value, control the fan to operate at this speed until the temperature of module A is continuously less than or equal to the final target temperature within a set time; return to step S1, S5. Judge whether the temperatures of both the first power module and the second power module are greater than the first target temperature: If so, use the second target temperature as the target value to control the fan speed until the temperatures of the first power module and the second power module are continuously less than or equal to the target value within the set time, and the second target temperature is less than the first target temperature; jump to step S4; Otherwise, execute step S6; S6. Adjust the fan speed according to the temperature of the first power module and the temperature of the second power module until the temperatures of the first power module and the second power module are continuously less than or equal to the final target temperature within the set time.

[0005] A further improvement of the present invention lies in that: in the step S3, the calculation formula of the fan speed is: ; Wherein, is the fan speed, e(t) is the temperature deviation of module A at the current moment, is the sum of all temperature deviations of module A from time 0 to t, e(t - 1) is the temperature deviation of module A at the previous moment, Kp is the proportional coefficient, Ki is the integral gain, and Kd is the derivative gain.

[0006] A further improvement of the present invention lies in that: in the step S3, if it is the first adjustment, the fan speed is calculated by the following formula: fan speed = current fan speed + fan speed control ratio * temperature deviation of module A; otherwise, the formula in claim 2 is used to calculate the fan speed.

[0007] A further improvement of the present invention lies in that: in the step S3, if the temperature deviation of module A this time is greater than the temperature deviation of the last time, the fan speed is calculated by the following formula: fan speed = current fan speed + fan speed control ratio * temperature deviation of module A - deviation coefficient к; If the temperature deviation of module A is less than the temperature deviation of the last time, it means that the temperature of power module A has an upward trend, and the fan speed is increased. The fan speed is calculated by the following formula: fan speed = current fan speed + fan speed control ratio * temperature deviation of module A + deviation coefficient k.

[0008] A further improvement of the present invention lies in that: the calculation formula of the deviation coefficient k is: k = , e(t) is the temperature deviation of power module A at the current moment, e(t - 1) is the temperature deviation of module A at the previous moment, and Kd is the derivative gain.

[0009] A further improvement of the present invention lies in that: in the step S3, the temperature of module A showing a downward trend means that the temperature of module A is continuously less than or equal to the target value within the set time.

[0010] A further improvement of the present invention lies in that: in the step S4, the step size is 2°C - 10°C.

[0011] A further improvement of the present invention lies in that: in the step S6, the method described in steps S2 - S5 is adopted to adjust the fan speed according to the temperature of the first power module and the temperature of the second power module.

[0012] In a second aspect, the present invention provides a charging pile heat dissipation device based on the PID algorithm for implementing the method described in the above claims, which is characterized by comprising: A control board, configured to collect the temperature of the power module, calculate the rotation speed of each fan based on the temperature and the PID algorithm, and control the operating state of the fan based on the rotation speed of each fan; A fan, configured to receive the control instruction of the control board and operate based on the control instruction.

[0013] A further improvement of the present invention lies in that: the model and installation position of the fan are determined according to the maximum heat dissipation temperature when the power module operates at full power.

[0014] Compared with the prior art, the present invention has at least the following beneficial technical effects: The control method of the present invention is based on the PID algorithm, combines the module temperature and module working state parameters, adopts the method of zoning to control the fan, calculates the rotation speed of the fan according to the real-time temperature and state of the power module corresponding to each fan, and the rotation speed corresponding to the fan is different under different power module temperatures and states, reducing the problem of the charging duration of customers caused by the decrease in the charging power of the module due to the increase in the temperature of the power module. At the same time, it reduces the noise problem caused by the full-speed operation of the system fan due to the relatively high temperature of the power module, and reduces the power loss problem caused by the full-speed rotation of the fan. Whether the fan rotates and the rotation speed when it rotates are determined according to the different temperatures of the modules in different regions, reducing the power loss of the charging system caused by the rotation of the fan, saving energy and improving the customer yield.

[0015] Furthermore, the present invention calculates the fan rotation speed by gradually reducing the target temperature to control the operating state of the fan. During the process of gradually reducing the target temperature, the system can gradually reduce the fan rotation speed, thereby reducing energy consumption while ensuring the cooling effect and improving the cooling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a side view of the placement position of the module and the fan in the charging pile; Figure 2 It is a flowchart of controlling the rotation speed of the fan by the PID algorithm. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The present invention will be described in detail below with reference to the drawings and specific embodiments.

[0018] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0019] It should be noted that when an element is referred to as being "disposed on" another element, it can be directly on the other element or there can also be another element in the middle. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be another element in the middle at the same time. The terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. used herein indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0021] The present invention mainly includes a method and a device for calculating and controlling the rotation speed of a cooling fan of a charging pile through a PID algorithm. The main idea of this solution is to determine the installation position of the fan according to the installation position and quantity of power modules (hereinafter referred to as modules) in the charging pile system, and at the same time calculate the rotation speed of the fan according to the module temperature and status corresponding to each fan. The rotation speed of the fan is different under different module temperatures and module statuses. This solution can reduce the problem that the charging power of the module decreases due to the increase in module temperature, affecting the charging experience of customers, and can also reduce the noise problem caused by the full-speed operation of the fan due to the relatively high module temperature. Moreover, it can also determine whether the fan rotates and the rotation speed when it rotates according to the different module temperatures in different regions, reducing the power consumption of the charging system caused by the rotation of the fan, saving energy and improving the customer return rate.

[0022] Such as Figure 1As shown in the figure, A represents the cabinet shell of the charging pile. The first module - the eighth module represent the placement positions of the charging modules in the charging pile. The first fan - the fourth fan represent the placement positions of the fans for cooling the modules in the charging pile. Among them, the first fan corresponds to the cooling of the first module and the second module, and is located directly behind the second module; the second fan corresponds to the cooling of the third module and the fourth module, and is located directly behind the fourth module; the third fan corresponds to the cooling of the fifth module and the sixth module, and is located directly behind the sixth module; the fourth fan corresponds to the cooling of the seventh module and the eighth module, and is located directly behind the eighth module. The control board communication 1 is responsible for collecting the temperatures of the first module to the eighth module. The control board first fan control to the fourth fan control respectively control the rotation speeds of the first fan to the fourth fan.

[0023] Conduct a structural design based on the module positions of the charging pile system. This design determines the installation positions of the modules and the air ducts for module cooling. Decide on the fan model based on the maximum cooling temperature when the modules are operating at full power, and determine the power, air volume, and installation position of the fan. The fan is selected as an adjustable - speed fan. When the modules are operating in different temperature ranges and working states, calculate different fan rotation speeds, thereby achieving intelligent control.

[0024] Refer to Figure 2 , Figure 2 The flowchart example in

[0025] Take the control method of the first fan as an example to illustrate the control method of the present invention.

[0026] A control method for a charging - pile cooling fan based on the PID algorithm includes the following steps: S1. The control board receives the ambient temperatures from each module and analyzes the received module temperatures. The control board analyzes whether the temperatures of the first module and the second module are greater than or equal to 45°C: If only one module temperature ≥ 45°C, mark the module with a temperature greater than 45°C as module A, set the target temperature of module A to 45°C, calculate the fan rotation speed using the PID algorithm, and the control board adjusts the fan rotation speed to the calculated fan rotation speed; If this is the first adjustment, the calculation formula for the fan rotation speed is: fan rotation speed = current fan rotation speed + fan rotation speed control ratio * module A temperature deviation, and module A temperature deviation = target temperature of module A - actual temperature of module A.

[0027] S2. If the first fan is already in operation (which means the rotational speed of the current first fan has been calculated using the PID algorithm and the rotational speed of the fan is being controlled by the control board), then compare the deviation value between the current temperature of Module A and the target temperature with the deviation value between the temperature of Module A and the target temperature during the last adjustment. S3. Calculate the deviation coefficient к based on the temperature deviation of Module A and the previous temperature deviation of Module A.

[0028] The calculation formula for the deviation coefficient к is: k = , where e(t) is the temperature deviation of Module A at the current moment, e(t - 1) is the temperature deviation of Module A at the previous moment, and Kd is the differential gain, which is a coefficient obtained based on experience.

[0029] a). If the deviation of Module A this time and the last time is greater than 0, it means the current temperature of Module A has a decreasing trend, and the rotational speed of the first fan needs to be reduced. Calculate the rotational speed of the first fan through the following formula: Rotational speed of the first fan = Current rotational speed of the first fan + Rotational speed control ratio of the first fan * Temperature deviation of Module A - Deviation coefficient k.

[0030] b). If the temperature deviation of the current module is less than 0 compared to the temperature deviation during the last adjustment, it means the current temperature of the module has an increasing trend, and the rotational speed of the first fan needs to be increased. Calculate the rotational speed of the first fan through the following formula: Rotational speed of the fan = Current rotational speed of the fan + Rotational speed control ratio of the fan * Temperature deviation of Module A + Deviation coefficient k.

[0031] c). If the difference between the temperature deviation of Module A this time and the previous temperature deviation is equal to 0, it proves that the current rotational speed of Module A can meet the module cooling requirement, and the current fan rotational speed can be maintained.

[0032] S4. Based on the operation result of c), the temperature of Module A is less than or equal to 45°C, greater than 35°C, and continues to run for 10 minutes. S5. When the temperature of Module A shows a decreasing trend, adjust the target temperature of Module A to 35°C. Readjust the rotational speed of the first fan according to the method in Step 1 until the temperature of Module A reaches the target temperature of 35°C.

[0033] S6. When the temperature of Module A is less than or equal to 35°C and continues to run for 10 minutes, adjust the target temperature of Module A to 25°C. Readjust the rotational speed of the fan according to the PID algorithm in Step 1 until the temperature of Module A reaches the target temperature of 25°C.

[0034] S7. When the temperature of Module A is less than or equal to 25°C and continues to run for 10 minutes, adjust the target temperature of Module A to 23°C. Readjust the rotational speed of the fan according to the PID algorithm in Steps 1, 2, and 3 until the module temperature reaches the target temperature of 23°C.

[0035] S5. The temperature of Module A is maintained at 23°C and it runs continuously for 2 minutes. At this time, the temperature of Module A is already within the appropriate operating range, so the fan stops rotating.

[0036] If the temperatures of the first module and the second module both reach 45°C, adjust the target temperatures of the first module and the second module to 35°C.

[0037] Adjust the speed of the first fan again according to steps 1, 2, 3, 4, and 5 through the PID algorithm until the temperatures of the first module and the second module reach the target temperature of 23°C, and then turn off the first fan after running continuously for 2 minutes.

[0038] Similarly, when the temperature of Module A reaches other starting conditions, refer to the algorithm for adjusting the fan speed when the reference module temperature reaches 45°C to keep the temperature of this module within a reasonable range.

[0039] From Figure 1 It can be seen that each fan corresponds to the temperature control of modules in different areas. The device provided by the present invention detects the temperature of the module corresponding to the fan and the current working state of the module by the control board. When the temperature of the module in the area corresponding to the fan reaches the starting condition, the fan rotates. At the same time, the control board also calculates the speed of the fan according to the module temperature through the PID algorithm. The lower the speed of the fan, the smaller the noise, and the higher the speed, the greater the noise.

[0040] From Figure 2 It can be seen that the control board controls the starting of each fan. When the temperature and state of the module in the area corresponding to the fan reach the starting condition, the fan starts to rotate, and the speed of the fan is also different according to different module temperatures after starting. The fewer the fans start, the lower the speed, and the lower the energy loss. The more the fans start, the higher the speed, and the higher the energy loss.

[0041] During the operation of the system, under the condition of meeting the normal output power of the module, control the fan not to rotate or rotate at the lowest speed as much as possible.

[0042] From Figure 1 It can be seen that the speed of the first fan corresponds to the temperatures of the first module and the second module, the speed of the second fan corresponds to the temperatures of the third module and the fourth module, the speed of the third fan corresponds to the temperatures of the fifth module and the sixth module, and the speed of the fourth fan corresponds to the temperatures of the seventh module and the eighth module. Therefore, the speeds of all the fans in steps 5 and 6 are not only determined according to the temperature and state of the module, but also controlled in zones. This increases the accuracy of fan control, reduces the noise and power consumption caused by the rotation of the fan.

[0043] Embodiment 2 The PID algorithm is a commonly used algorithm in closed-loop control systems. PID is an acronym for proportion, integral, and differential. The PID algorithm is a closed-loop control algorithm that combines the three links of proportion, integral, and differential into one.

[0044] The calculation formula of the PID algorithm is ; where, u(t) is the output control signal, that is, the fan speed, e(t) is the deviation at the current moment, that is, the difference between the target value and the actual value, is the sum of all deviations from 0 to time t, e(t - 1) is the deviation at the previous moment, Kp is the proportional coefficient, Ki is the integral gain, and Kd is the differential gain; Kp, Ki, and Kd are obtained through a large number of experiments and experimental results. The coefficients in the following example are calculated through a large number of experiments: Kp = 1, Ki = 0.1, Kd = 0.1.

[0045] For example: The first fan corresponds to the first module and the second module Step 1: Initially, when the temperature of the first module = 48°C and the temperature of the second module < 45°C, at this time the target temperature of the first fan is 45°C, then the speed of the first fan is: First fan speed = 0 + 0.1 * (48 - 45) + 0.1 * 0 = 0.3 rpm.

[0046] Based on the conditions of Step 1, the following is analyzed in two cases: Case 1: The temperature of the first module is still higher than 45°C; Case 2: The temperatures of both the first module and the second module are lower than 45°C; Case 1: Based on Step (1), the fan speed runs continuously at 0.3. The control board continuously detects the temperatures of the first module and the second module. When the first fan runs for a period of time and it is detected that the temperature of the first module = 46°C and the temperature of the second module < 45°C, at this time the target temperature of the first module is 45°C, then the speed of the first fan is calculated by the following method: Previous deviation value: 45 - 48 = -3; Current deviation value: 45 - 46 = -1; |Previous deviation value| > |Current deviation value|, and the current deviation value < 0; First fan speed = 0.3 + 0.1 * (45 - 46) + 0.1 * (-1 - (-3)) = 0.4 rpm; Case 2: The first fan runs at a speed of 0.3 continuously. The control board detects the temperatures of the first module and the second module in real time. After the fan has run for a period of time, the temperature of the first module is detected to be 45 °C, and the temperature of the second module is < 45 °C. It runs continuously for 10 minutes. Since the module temperatures show a downward trend, during the continuous operation of 10 minutes, the speed of the first fan is calculated by the following method: Previous deviation value: 45 – 48 = -3; Current deviation value: 45 – 45 = 0; |Previous deviation value| > |Current deviation value|, and the current deviation value > 0; The speed of the first fan = 0.3 + 0.1*(45–44) - 0.1*(0 - (-3)) = 0.1 rpm; Step 3: Similarly, under other temperature conditions, the control board controls the fan in the same calculation method.

[0047] Step 4: When the module temperature ≤ 23 °C, continue with the fan speed calculated in the last calculation, and the fan continues to rotate for 1 minute and then stops.

[0048] Embodiment 3 This embodiment provides a charging pile heat dissipation device based on the PID algorithm for implementing the above-mentioned charging pile heat dissipation fan control method, including: A control board, which is used to collect the temperatures of the power modules, calculate the speeds of each fan based on the temperatures and the PID algorithm, and control the operating states of the fans based on the speeds; Fans, which are used to receive the control instructions from the control board and operate based on the control instructions. Among them, the installation positions of the fans match the heat dissipation paths of the two corresponding power modules, and the maximum air volume of each fan covers the full-power heat dissipation requirements of the corresponding power module.

[0049] The fans adopt DC brushless fans or centrifugal fans.

[0050] The term "comprising" used to describe a combination should include the identified elements, components, parts or steps, as well as other elements, components, parts or steps that do not substantially affect the basic novel features of the combination. Using the terms "including" or "comprising" to describe the combination of elements, components, parts or steps here also contemplates embodiments consisting essentially of these elements, components, parts or steps. Here, by using the term "may", it is intended to indicate that any attribute described as "may" included is optional.

[0051] A plurality of elements, components, parts, or steps can be provided by a single integrated element, component, part, or step. Alternatively, a single integrated element, component, part, or step may be separated into discrete plural elements, components, parts, or steps. The disclosure of "a" or "an" used to describe an element, component, part, or step does not preclude the presence of other elements, components, parts, or steps.

[0052] It should be understood that the above description is for illustrative purposes and not for limitation. Many embodiments and many applications other than the examples provided will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of the present teachings should not be determined with reference to the above description, but should be determined with reference to the full scope of the foregoing claims and the equivalents of those claims. For the sake of completeness, all articles and references, including patent applications and published patents, are incorporated herein by reference. Omitting any aspect of the subject matter disclosed herein from the foregoing claims is not intended to abandon such subject matter, nor should it be considered that the applicant has not considered such subject matter to be part of the disclosed inventive subject matter.

Claims

1. A control method for the cooling fan of a charging pile based on the PID algorithm, characterized in that It includes the following steps: S1. For each fan, collect the temperature of its corresponding first power module and the temperature of the second power module; S2. Independently perform the following judgment for each fan: Judge the magnitude relationship between the temperature of the first power module, the temperature of the second power module and the first target temperature: If the temperature of only one power module is greater than or equal to the first target temperature, record the power module with a temperature greater than or equal to the first target temperature as module A, and execute S3; otherwise, jump to S5; S3. Take the first target temperature as the target value; Based on the target value, use the PID algorithm to calculate the corresponding fan speed and control the fan to operate at this speed until the temperature of module A shows a downward trend; S4. Reduce the target value by a set step size, calculate the fan speed based on the reduced target value, and control the fan to operate at this speed until the temperature of module A is continuously less than or equal to the final target temperature within the set time; Return to step S1, S5. Judge whether the temperatures of both the first power module and the second power module are greater than the first target temperature: If so, take the second target temperature as the target value and control the fan speed until the temperatures of the first power module and the second power module are continuously less than or equal to the target value within the set time, and the second target temperature is less than the first target temperature; Jump to step S4; Otherwise, execute step S6; S6. Adjust the fan speed according to the temperatures of the first power module and the second power module until the temperatures of the first power module and the second power module are continuously less than or equal to the final target temperature within the set time.

2. The control method of the charging pile cooling fan based on the PID algorithm according to claim 1, characterized in that, In step S3, the calculation formula for the fan speed is: ； Among them, is the fan speed, e(t) is the temperature deviation of module A at the current moment, is the sum of all temperature deviations of module A from 0 to t moments, e(t - 1) is the temperature deviation of module A at the previous moment, Kp is the proportionality coefficient, Ki is the integral gain, and Kd is the derivative gain.

3. A control method for a charging pile cooling fan based on the PID algorithm according to claim 1 or 2, characterized in that, In step S3, if it is the first adjustment, the fan speed is calculated by the following formula: fan speed = current fan speed + fan speed control ratio * temperature deviation of module A; otherwise, the formula in claim 2 is used to calculate the fan speed.

4. A control method for a charging pile cooling fan based on the PID algorithm according to claim 1, characterized in that In step S3, if the temperature deviation of module A this time is greater than the previous temperature deviation, the fan speed is calculated by the following formula: fan speed = current fan speed + fan speed control ratio * temperature deviation of module A - deviation coefficient к; If the temperature deviation of module A is less than the previous temperature deviation, it means that the temperature of power module A has an upward trend, and the fan speed is increased. The fan speed is calculated by the following formula: fan speed = current fan speed + fan speed control ratio * temperature deviation of module A + deviation coefficient k.

5. The control method of the charging pile cooling fan based on the PID algorithm according to claim 4, characterized in that, The calculation formula for the deviation coefficient k is: k = , where e(t) is the temperature deviation of power module A at the current moment, e(t - 1) is the temperature deviation of module A at the previous moment, and Kd is the differential gain.

6. The control method of the charging pile cooling fan based on the PID algorithm according to claim 1, wherein, In step S3, the temperature of module A showing a downward trend means that the temperature of module A is continuously less than or equal to the target value within the set time.

7. A control method for a charging pile cooling fan based on the PID algorithm according to claim 1, characterized in that In step S4, the step size is 2°C - 10°C.

8. A control method for a charging pile cooling fan based on the PID algorithm according to claim 1, characterized in that, In step S6, the method described in steps S2 - S5 is used to adjust the fan speed according to the temperatures of the first power module and the second power module.

9. A charging pile heat dissipation device based on the PID algorithm, used to implement the method described in claim 1, characterized in that, It includes: A control board for collecting the temperature of the power module, calculating the speed of each fan based on the temperature and the PID algorithm, and controlling the operating state of the fan based on the speeds of the respective fans; A fan for receiving the control instruction of the control board and operating based on the control instruction.

10. The control device for the charging pile cooling fan based on the PID algorithm according to claim 9, characterized in that, The installation position of the blower is matched with the heat dissipation paths of the two corresponding power modules, and the maximum air volume of each blower covers the full-power heat dissipation requirements of the corresponding power module.

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