A method and device for controlling the uniform temperature and heat dissipation of an inverter

Abstract

This invention provides a method and apparatus for controlling the uniform temperature dissipation of an inverter. The method includes: Step S1, a first temperature acquisition module acquires the temperature Tm of the inverter power module, a second temperature acquisition module acquires the temperature Td1 on one side of the inverter's air duct, and a third temperature acquisition module acquires the temperature Td2 on the other side of the inverter's air duct; Step S3, based on the temperatures Tm, Td1, and Td2, the operation and speed of a first fan, a second fan, and a third fan are controlled. The first fan is located at the air inlet of the inverter, the second fan is located on one side of the inverter's air duct, and the third fan is located on the other side of the inverter's air duct. This invention effectively reduces fan power consumption, improves overall efficiency, and results in a more uniform temperature distribution within the inverter, thus improving the inverter's reliability.

Description

Technical Field

[0001] This invention belongs to the field of power electronics technology, and more specifically, relates to a method and device for controlling the uniform temperature and heat dissipation of an inverter. Background Technology

[0002] Inverter design is trending towards miniaturization and modularization, making overall heat dissipation particularly important as it directly impacts system stability and reliability. Good heat dissipation should effectively and promptly release heat while minimizing energy consumption caused by heat dissipation.

[0003] Currently, the most common heat dissipation methods for inverters are as follows: 1) Natural cooling, which means that the inverter releases heat through natural heat dissipation when it is working. This method limits the power of the inverter; 2) Air cooling, which means that the inverter releases heat through a fan when it is working. This method needs to balance the heat dissipation effect and fan loss. Therefore, the cooling fan is usually intelligently controlled; 3) Liquid cooling, which usually has the best heat dissipation effect, but the design and manufacturing cost is higher.

[0004] Inverters that use air cooling typically have the cooling fan mounted at the air intake on the outside of the power module, such as... Figure 1 As shown, when the inverter is operating, the controller monitors the temperature of the power module in real time to drive the cooling fan to output a specific speed for air cooling. To minimize fan power consumption, the cooling fan speed is intelligently controlled, such as... Figure 2 As shown, its control method is as follows: During startup, the power module temperature Tm is monitored in real time. If Tm exceeds a preset value, the fan starts; if Tm is less than the preset value, the fan stops. The power module is the primary heat source of the converter, therefore, the power module temperature Tm directly determines the operating state of the cooling fan.

[0005] Power modules are composed of semiconductor device packages. Common semiconductor junction temperatures can reach up to 150°C. Under many operating conditions, the surface temperature of the power module heatsink can reach over 100°C, and heat is conducted and radiated in all directions within the converter. For example... Figure 1 As shown, the airflow direction of a typical PCS cooling fan is fixed. Considering that the air resistance should not be too large and the airflow design should not be too complicated, heat can still accumulate in non-airflow areas, which can harm the stable and reliable operation of electronic components and the whole machine. Summary of the Invention

[0006] To address the current problem of uneven heat dissipation in inverters, this application provides an inverter temperature uniformity and heat dissipation control method and apparatus, the method comprising:

[0007] S1, the first temperature acquisition module acquires the temperature Tm of the inverter power module, the second temperature acquisition module acquires the temperature Td1 on one side of the inverter's air duct, and the third temperature acquisition module acquires the temperature Td2 on the other side of the inverter's air duct.

[0008] S3 controls the operation and speed of the first fan, the second fan and the third fan according to the temperatures Tm, Td1 and Td2. The first fan is located at the air inlet of the inverter, the second fan is located on one side of the air duct of the inverter, and the third fan is located on the other side of the air duct of the inverter.

[0009] Step S3 includes: calling a quadratic regression model to determine temperature thresholds Tmth, T1th, and T2th based on the difference between temperatures Td1 and Td2, and temperatures Tm, Td1, and Td2; controlling the first fan to start when temperature Tm is greater than temperature threshold Tmth; starting the second fan when temperature Td1 is greater than temperature threshold T1th; and starting the third fan when temperature Td2 is greater than temperature threshold T2th.

[0010] In step S3, the inverter operates at rated power, with Y = Td1 - Td2 as the output, and a preset temperature threshold Tmth. 预设 T1th 预设 T2th 预设 As input, the quadratic regression formula is:

[0011]

[0012] Where Ti is the independent variable, which in this model are the action thresholds of each fan, βi is the linear regression coefficient, βii is the quadratic regression coefficient, e is the systematic error, which is obtained by comparing the test value with the standard value, and βi and βii are obtained by least squares fitting.

[0013] Among them, the preset temperature threshold Tmth 预设 =70℃, Td1th 预设 =65℃, Td2th 预设 =60℃.

[0014] Step S3 includes: calling the quadratic regression model for iteration, and obtaining the corresponding temperature thresholds Tmth, T1th, and T2th when the average temperature Y reaches its minimum value.

[0015] The first fan is the main fan, while the second and third fans are both turbulence fans.

[0016] Secondly, this application provides an inverter temperature equalization and heat dissipation control device, comprising:

[0017] The first temperature acquisition module is used to acquire the temperature Tm of the inverter power module;

[0018] The second temperature acquisition module is used to acquire the temperature Td1 on one side of the air duct of the inverter.

[0019] The third temperature acquisition module is used to acquire the temperature Td2 on the other side of the inverter's air duct.

[0020] The processing module is used to control the operation and speed of the first fan, the second fan and the third fan according to the temperatures Tm, Td1 and Td2; the first fan is located at the air inlet of the inverter, the second fan is located on one side of the air duct of the inverter, and the third fan is located on the other side of the air duct of the inverter.

[0021] The processing module is configured to: invoke a quadratic regression model to determine temperature thresholds Tmth, T1th, and T2th based on the difference between temperatures Td1 and Td2, and temperatures Tm, Td1, and Td2; control the first fan to start when temperature Tm is greater than temperature threshold Tmth; control the second fan to start when temperature Td1 is greater than temperature threshold T1th; and control the third fan to start when temperature Td2 is greater than temperature threshold T2th.

[0022] Thirdly, this application provides an inverter, including the inverter temperature heat dissipation control device described in any of the above claims.

[0023] Fourthly, this application provides an electronic device including the inverter temperature equalization and heat dissipation control device described in any of the above claims.

[0024] The inverter temperature equalization and heat dissipation control method and device of this application have the following beneficial effects:

[0025] This application effectively reduces fan power consumption and improves overall efficiency, while also resulting in a more uniform temperature distribution within the inverter and enhanced inverter reliability. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the cooling fan structure of an inverter in the prior art;

[0027] Figure 2 This is a schematic diagram of the inverter cooling fan control process in the prior art;

[0028] Figure 3 This is a flowchart illustrating the inverter temperature equalization and heat dissipation control method of this application;

[0029] Figure 4 This is a schematic diagram of the inverter temperature equalization and heat dissipation control method of this application;

[0030] Figure 5This is a schematic diagram illustrating the use of quadratic regression to determine the optimal threshold for the operation of the system's temperature equalization cooling fan in this application.

[0031] Figure 6 This is another flowchart illustrating the inverter temperature equalization and heat dissipation control method of this application;

[0032] Figure 7 This is a schematic diagram of the inverter temperature equalization and heat dissipation control device of this application. Detailed Implementation

[0033] The present application will be further described below with reference to the accompanying drawings and embodiments.

[0034] In the following description, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The following description provides multiple embodiments of the invention, which can be substituted or combined with each other. Therefore, this application can also be considered to include all possible combinations of the same and / or different embodiments described. Thus, if one embodiment includes features A, B, and C, and another embodiment includes features B and D, then this application should also be considered to include embodiments containing one or more other possible combinations of features A, B, C, and D, even if such embodiments are not explicitly described in the following text.

[0035] like Figure 3-4 As shown, the inverter temperature equalization and heat dissipation control method of this application includes: S1, a first temperature acquisition module acquires the temperature Tm of the inverter power module, a second temperature acquisition module acquires the temperature Td1 on one side of the inverter's air duct, and a third temperature acquisition module acquires the temperature Td2 on the other side of the inverter's air duct; S3, based on the temperatures Tm, Td1, and Td2, the operation and speed of the first fan, the second fan, and the third fan are controlled. The first fan is located at the air inlet of the inverter, the second fan is located on one side of the inverter's air duct, and the third fan is located on the other side of the inverter's air duct. A detailed description follows.

[0036] This application proposes a new and more intelligent inverter heat dissipation solution based on the overall heat distribution characteristics of the inverter during operation, such as... Figure 4As shown, this scheme proposes to arrange a first temperature acquisition module, a second temperature acquisition module, and a third temperature acquisition module inside the inverter enclosure. The first temperature acquisition module is used to acquire the power module temperature Tm, the second temperature acquisition module is used to acquire the ambient temperature Td1 at one end of the enclosure, and the third temperature acquisition module is used to acquire the ambient temperature Td2 at the other end of the enclosure. Simultaneously, a cooling fan Fan_m (first fan) is arranged at the power module, a turbulence fan Fan1 (second fan) is arranged at the first temperature acquisition module, and a turbulence fan Fan2 (third fan) is arranged at the second temperature acquisition module. Fan_m is the main fan with a larger rated power, while Fan1 and Fan2 are two auxiliary fans with smaller rated power.

[0037] The new inverter temperature equalization and heat dissipation control strategy takes temperatures Tm, T1, and T2 as inputs, and the operation and speed of each fan are jointly determined by Tm, T1, T2, and preset temperature thresholds Tmth, T1th, and T2th. To address the issue of uneven heat dissipation across the entire system, the optimization objective is to minimize the amplitude of temperature unevenness in the inverter system. Temperature equalization control is achieved by controlling the operation and speed of three fans (Fan_m, Fan1, and Fan2). This includes: calling a quadratic regression model to determine the optimal solution set for the operating state of each fan corresponding to the minimum amplitude of temperature unevenness within the entire system under a certain operating condition, based on the values ​​of three key temperature sampling points collected by the first, second, and third temperature acquisition modules and the temperature differences between them.

[0038] The inverter operates at rated power. Regression testing is used to obtain the optimal values ​​of preset temperature thresholds for controlling the switching and speed of the three fans. These three temperature thresholds constitute the optimal solution set. The actual goal is to achieve optimal temperature uniformity because when the temperature difference between Td1 and Td2 is minimized, the temperatures Td1, Td2, and Tm themselves are also relatively small. "Minimizing the amplitude of temperature non-uniformity within the unit" means that, with the inverter operating at rated power, the difference between Td1 and Td2 represents the difference in ambient temperature within the unit. This difference is minimized by setting optimal fan operation thresholds to control the fans.

[0039] In some embodiments, step S3 includes: calling a quadratic regression model to determine temperature thresholds Tmth, T1th, and T2th based on the difference between temperatures Td1 and Td2, and temperatures Tm, Td1, and Td2; controlling the first fan to start when temperature Tm is greater than the temperature threshold Tmth; starting the second fan when temperature Td1 is greater than the temperature threshold T1th; and starting the third fan when temperature Td2 is greater than the temperature threshold T2th. The quadratic regression model is obtained by performing multi-condition optimization calculations and tests, using the system temperature unevenness amplitude as the response value and the operating state of each fan as the independent variable.

[0040] In step S3, the inverter operates at rated power, with Y = Td1 - Td2 as the output, and a preset temperature threshold Tmth. 预设 T1th 预设 T2th 预设 As input, the quadratic regression formula is:

[0041]

[0042] Where Ti is the independent variable, which in this model are the action thresholds of each fan, βi is the linear regression coefficient, βii is the quadratic regression coefficient, e is the systematic error, which is obtained by comparing the test value with the standard value, and βi and βii are obtained by least squares fitting.

[0043] Actual experiments revealed that, under the same inverter rated power operating conditions, when the temperatures Td1-Td2 are relatively low, Tm, Td1, and Td2 are also relatively low. For example... Figure 5-6 As shown, a quadratic regression model is used for iteration. When the average temperature Y reaches its minimum value, the corresponding optimal temperature thresholds Tmth, T1th, and T2th are obtained, thus yielding the three temperature thresholds Tmth, T1th, and T2th required for the overall temperature uniformity control of the inverter. After obtaining the optimal temperature thresholds, fan control is performed with the actual detected temperature as the independent variable and optimal temperature uniformity as the objective. To facilitate the digital implementation of the control system, a state machine for the three fans inside the inverter is constructed, as shown in Table 1.

[0044] Table 1 Fan operating state machine based on the optimal threshold for uniform temperature heat dissipation

[0045]

[0046] like Figure 6 As shown, this application collects temperature information in real time through a first temperature acquisition module, a second temperature acquisition module, and a third temperature acquisition module. The corresponding fan action is determined based on a preset temperature threshold. The difference between temperatures Td1 and Td2 is used to determine if there is a temperature rise disturbance. If so, heat dissipation control is implemented; otherwise, the fan action is controlled according to the preset temperature threshold. This application aims to minimize the overall inverter temperature difference, achieved by calculating the optimal fan action set (three temperature thresholds) through real-time temperature detection and preset temperature thresholds. Furthermore, this application can detect and determine if there are disturbances affecting heat dissipation during inverter operation, allowing the inverter to quickly respond to new operating conditions and ensuring stable and reliable system operation.

[0047] This application proposes a method for uniform heat dissipation in inverters. By using multi-channel temperature detection and calculating the optimal solution set of fan operation based on preset fan operation thresholds (three temperature thresholds), it can effectively solve the problem of uneven heat dissipation in inverters, thus improving the overall reliability of the unit. Simultaneously, it improves the heat dissipation efficiency of the main cooling fan Fan_m of the power module. Under the same operating conditions, to achieve the same heat dissipation effect, the solution using this application requires less power from fan Fan_m, which is beneficial for improving the overall efficiency of the unit.

[0048] In this application, fan Fan_m is located at the air inlet of the inverter and mainly provides heat dissipation for the power module. A first temperature acquisition module is placed at the power module. Fan1 is located on one side of the air duct and a second temperature acquisition module is placed at Fan1. Fan2 is located on the other side of the air duct and a third temperature acquisition module is placed at Fan2. Three preset temperature thresholds Tmth are set. 预设 =70℃, Td1th 预设 =65℃, Td2th 预设 =60℃. When the inverter operates at its rated power, the inverter cooling fan typically needs to run at its rated speed, with fan Fan_m consuming 100% of its rated power. To achieve the same cooling effect, using the uniform temperature control method described in this application, fan Fan_m operates at 70% speed, consuming 49% of its rated power, while fans Fan1 and Fan2 consume less power. Overall, this effectively reduces fan power consumption, improves overall efficiency, and results in a more uniform temperature distribution within the inverter, enhancing its reliability.

[0049] like Figure 7 As shown, this application also provides an inverter temperature equalization and heat dissipation control device, including: a first temperature acquisition module 201 for acquiring the temperature Tm of the inverter power module; a second temperature acquisition module 202 for acquiring the temperature Td1 on one side of the inverter's air duct; a third temperature acquisition module 203 for acquiring the temperature Td2 on the other side of the inverter's air duct; and a processing module 204 for controlling the operation and speed of the first fan 205, the second fan 206, and the third fan 207 according to the temperatures Tm, Td1, and Td2; the first fan 205 is located at the air inlet of the inverter, the second fan 206 is located on one side of the inverter's air duct, and the third fan 207 is located on the other side of the inverter's air duct.

[0050] The processing module 204 is used to: call a quadratic regression model to determine temperature thresholds Tmth, T1th, and T2th based on the difference between temperatures Td1 and Td2, and temperatures Tm, Td1, and Td2; control the first fan to start when temperature Tm is greater than temperature threshold Tmth; control the second fan to start when temperature Td1 is greater than temperature threshold T1th; and control the third fan to start when temperature Td2 is greater than temperature threshold T2th.

[0051] In this application, the embodiments of the inverter temperature equalization and heat dissipation control device are basically similar to the embodiments of the inverter temperature equalization and heat dissipation control method. For relevant details, please refer to the description of the embodiments of the inverter temperature equalization and heat dissipation control method.

[0052] This application also provides an inverter, including any of the above-mentioned inverter temperature heat dissipation control devices.

[0053] This application also provides an electronic device, including any of the above-mentioned inverter temperature heat dissipation control devices.

[0054] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An inverter temperature uniformity heat dissipation control method, characterized by, Comprising: S1, the first temperature acquisition module collects the temperature Tm of the inverter power module, the second temperature acquisition module collects the temperature Td1 of one side of the inverter whole machine air duct, and the third temperature acquisition module collects the temperature Td2 of the other side of the inverter whole machine air duct; S3, according to the temperatures Tm, Td1 and Td2, the actions and rotating speeds of the first fan, the second fan and the third fan are controlled, the first fan is located at the air inlet of the inverter whole machine, the second fan is located at one side of the inverter whole machine air duct, and the third fan is located at the other side of the inverter whole machine air duct; A quadratic regression model is called, the temperature threshold values Tmth, T1th and T2th are determined according to the difference between the temperatures Td1 and Td2, the temperatures Tm, Td1 and Td2, when the temperature Tm is greater than the temperature threshold value Tmth, the first fan is controlled to start, when the temperature Td1 is greater than the temperature threshold value T1th, the second fan is controlled to start, and when the temperature Td2 is greater than the temperature threshold value T2th, the third fan is controlled to start; The inverter runs at rated power, Y=Td1-Td2 is taken as the output, preset temperature threshold values Tmth preset, T1th preset and T2th preset are taken as the input, and the quadratic regression formula is: Wherein, Ti is an independent variable, in the model, it is respectively each fan action threshold value, βi is a first-order term regression coefficient, βii is a quadratic term regression coefficient, and e is a system error, which is obtained by comparing test values with standard values, and βi and βii are obtained by least square fitting.

2. The inverter uniform temperature heat dissipation control method according to claim 1, characterized in that, Pre-set temperature threshold Tmth 预设 = 70°C, Td1th 预设 = 65°C, Td2th 预设 = 60°C.

3. The inverter uniform temperature heat dissipation control method according to claim 1 or 2, characterized by, Step S3 includes: calling a quadratic regression model for iteration, and when the uniform temperature Y obtains a minimum value, corresponding temperature threshold values Tmth, T1th and T2th are obtained.

4. The method of claim 3, wherein the temperature of the inverter is controlled to be uniform. The first fan is a main fan, and the second fan and the third fan are both spoiler fans.

5. An inverter temperature uniformity control device, characterized by comprising: Comprising: A first temperature acquisition module is arranged to collect the temperature Tm of the inverter power module; A second temperature acquisition module is arranged to collect the temperature Td1 of one side of the inverter whole machine air duct; A third temperature acquisition module is arranged to collect the temperature Td2 of the other side of the inverter whole machine air duct; A processing module is arranged to control the actions and rotating speeds of the first fan, the second fan and the third fan according to the temperatures Tm, Td1 and Td2; the first fan is located at the air inlet of the inverter whole machine, the second fan is located at one side of the inverter whole machine air duct, and the third fan is located at the other side of the inverter whole machine air duct; A quadratic regression model is called, the temperature threshold values Tmth, T1th and T2th are determined according to the difference between the temperatures Td1 and Td2, the temperatures Tm, Td1 and Td2, when the temperature Tm is greater than the temperature threshold value Tmth, the first fan is controlled to start, when the temperature Td1 is greater than the temperature threshold value T1th, the second fan is controlled to start, and when the temperature Td2 is greater than the temperature threshold value T2th, the third fan is controlled to start; The inverter runs at rated power, Y=Td1-Td2 is taken as the output, preset temperature threshold values Tmth preset, T1th preset and T2th preset are taken as the input, and the quadratic regression formula is: Wherein, Ti is the independent variable, in this model, it is respectively each fan action threshold, βi is the regression coefficient of the first order term, βii is the regression coefficient of the second order term, e is the system error, which is obtained by comparing the test value with the standard value, and βi and βii are obtained by least square fitting.

6. An inverter, characterized by, The inverter temperature equalization heat dissipation control device of claim 5.

7. An electronic device, comprising: The inverter temperature equalization heat dissipation control device of claim 5.

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