A Temperature Control Method for an Intelligent Power Module Based on a Gallium Nitride Power Chip

Abstract

The present invention provides a temperature control method for an intelligent power module based on a gallium nitride power chip, comprising the following steps: Step 1, obtain the module temperature of the intelligent power module, and determine whether there is poor heat dissipation in the intelligent power module when the module temperature is greater than a preset temperature control threshold; Step 2, if there is poor heat dissipation, obtain the basic temperature rise efficiency, and determine the sudden drop frequency and sudden drop time according to the sudden drop condition, the basic temperature rise efficiency and the preset temperature control threshold; Step 3, after the sudden drop time, obtain the current module temperature and the current basic temperature rise efficiency, and determine a new sudden drop frequency and sudden drop time according to the sudden drop condition, the current basic temperature rise efficiency and the current module temperature; Step 4, repeat Step 3 until the module temperature is less than the preset temperature safety value and then end.

Description

Technical Field

[0001] The present invention relates to the technical field of power modules, and particularly to a temperature control method for an intelligent power module based on a gallium nitride power chip. Background Art

[0002] Currently, when an intelligent power module is operating, to avoid damage to the intelligent power module due to excessive temperature, the temperature of the intelligent power module is usually monitored, a preset temperature control threshold is set, and when the temperature of the intelligent power module is greater than the preset temperature control threshold, the compressor connected to the intelligent power module is frequency-reduced to achieve a temperature reduction effect on the intelligent power module.

[0003] Considering that a too large sudden change in frequency may have an adverse impact on the normal operation of the equipment connected to the intelligent power module, the existing frequency reduction method is usually a slow and uniform frequency reduction.

[0004] Considering that the temperature drop caused by the slow and uniform frequency reduction when the intelligent power module is in a poor heat dissipation environment may be slower than the temperature rise of the intelligent power module, resulting in overshoot of the module temperature and damage to the intelligent power module. Currently, the solution to this problem is usually to set a sudden drop frequency. When the intelligent power module is in a poor heat dissipation situation, the sudden drop frequency processing method is used to prevent damage to the intelligent power module.

[0005] However, considering that using the sudden drop frequency processing method to reduce the temperature of the intelligent power module in a poor heat dissipation situation may still have an adverse impact on the normal operation of the equipment connected to the intelligent power module due to a too large sudden change in frequency. Therefore, a temperature control method for an intelligent power module based on a gallium nitride power chip is proposed, which adopts a phased temperature control method. When the intelligent power module is in a poor heat dissipation situation, the frequency is suddenly dropped in stages to control the temperature drop of the intelligent power module, achieving the effect of quickly cooling the intelligent power module without having an adverse impact on the normal operation of the equipment connected to the intelligent power module due to a too large sudden change in frequency. Summary of the Invention

[0006] Aiming at the deficiencies of the prior art, the present invention provides a temperature control method for an intelligent power module based on a gallium nitride power chip, which adopts a phased temperature control method. When the intelligent power module is in a poor heat dissipation situation, the frequency is suddenly dropped in stages to control the temperature drop of the intelligent power module, achieving the effect of quickly cooling the intelligent power module without having an adverse impact on the normal operation of the equipment connected to the intelligent power module due to a too large sudden change in frequency.

[0007] A temperature control method for an intelligent power module based on a gallium nitride power chip, comprising the following steps: Step 1, obtain the module temperature of the intelligent power module, and determine whether there is poor heat dissipation in the intelligent power module when the module temperature is greater than a preset temperature control threshold; Step 2, if there is poor heat dissipation, obtain the basic temperature rise efficiency, and determine the sudden drop frequency and sudden drop time according to the sudden drop condition, the basic temperature rise efficiency and the preset temperature control threshold; Step 3, after the sudden drop time, obtain the current module temperature and the current basic temperature rise efficiency, and determine the new sudden drop frequency and sudden drop time according to the sudden drop condition, the current basic temperature rise efficiency and the current module temperature; Step 4, repeat Step 3 until the module temperature is less than the preset temperature safety value and then end.

[0008] As an embodiment of the present invention, the step of determining whether there is poor heat dissipation in the intelligent power module includes: within a unit time, calculate the module temperature change value between the current module temperature and the module temperature obtained in the previous time; obtain the operating current of the intelligent power module control device and the preset unit time heat dissipation temperature change value; if the operating current is less than the preset overclocking operating current and the module temperature change value is greater than the preset unit time heat dissipation temperature change value, it is determined that there is poor heat dissipation in the intelligent power module.

[0009] As an embodiment of the present invention, the sudden drop conditions include: a sudden drop frequency ratio gradient table, a temperature change ratio gradient table, and a sudden drop frequency safety frequency conversion time gradient table; wherein, the sudden drop frequency ratio gradient table includes the sudden drop frequency ratios that can be gradually maximally dropped through experiments without affecting the normal operation of the device provided with the intelligent power module; the temperature change ratio gradient table includes the temperature change ratios that change gradually through experiments corresponding to the sudden drop frequency ratios on the premise that the module temperature of the intelligent power module does not exceed the critical temperature; the temperature change ratio includes any one of the temperature decrease ratio and the temperature increase ratio; the sudden drop frequency safety frequency conversion time gradient table includes the safety frequency conversion time corresponding to the sudden drop frequency ratio obtained through experiments.

[0010] As an embodiment of the present invention, Step 2 specifically includes: if there is poor heat dissipation, obtain the module temperature change value and calculate the basic temperature rise efficiency of the intelligent power module; obtain the first temperature change ratio in the temperature change ratio gradient table; determine the first temperature threshold according to the first temperature change ratio and the preset temperature control threshold; obtain the current frequency of the intelligent power module and the first sudden drop frequency ratio in the sudden drop frequency ratio gradient table; determine the sudden drop frequency according to the first sudden drop frequency ratio and the current frequency; obtain the standard temperature drop efficiency corresponding to the sudden drop frequency; calculate the estimated first time for the intelligent power module to change from the preset temperature control threshold to the first temperature threshold according to the basic temperature rise efficiency and the standard temperature drop efficiency; judge whether the estimated first time is greater than the first safety frequency conversion time in the sudden drop frequency safety frequency conversion time gradient table; determine the sudden drop time according to the judgment result.

[0011] As an embodiment of the present invention, determining the sudden drop time according to the judgment result includes: if the judgment result is greater than, taking the first safe frequency conversion time as the sudden drop time; if the judgment result is not greater than, taking the expected first time as the sudden drop time.

[0012] As an embodiment of the present invention, step 3 specifically includes: after the sudden drop time, obtaining the current module temperature, and determining the second module temperature change value according to the current module temperature and the preset temperature control threshold; calculating the current basic temperature rise efficiency of the intelligent power module according to the second module temperature change value; obtaining the second temperature change ratio in the temperature change ratio gradient table; determining the second temperature threshold according to the second temperature change ratio and the current module temperature; obtaining the second sudden drop frequency ratio in the sudden drop frequency ratio gradient table, and determining the new sudden drop frequency according to the second sudden drop frequency ratio and the sudden drop frequency; obtaining the standard improved temperature drop efficiency corresponding to the new sudden drop frequency on the basis of the sudden drop frequency; calculating the temperature error between the current module temperature and the first temperature threshold, and determining the efficiency error coefficient according to the temperature error; correcting the standard improved temperature drop efficiency according to the efficiency error coefficient to obtain the corrected improved temperature drop efficiency; calculating the expected second time for the intelligent power module to change from the current module temperature to the second temperature threshold according to the current basic temperature rise efficiency and the corrected improved temperature drop efficiency; judging whether the expected second time is greater than the second safe frequency conversion time in the sudden drop frequency safe frequency conversion time gradient table; determining the new sudden drop time according to the judgment result.

[0013] As an embodiment of the present invention, determining the new sudden drop time according to the judgment result includes: if the judgment result is greater than, taking the second safe frequency conversion time as the new sudden drop time; if the judgment result is not greater than, taking the expected second time as the new sudden drop time.

[0014] As an embodiment of the present invention, determining the efficiency error coefficient according to the temperature error includes: re-correcting the standard temperature drop efficiency according to the temperature error to obtain the corrected corrected temperature drop efficiency; determining the efficiency error coefficient according to the standard temperature drop efficiency and the corrected corrected temperature drop efficiency.

[0015] As an embodiment of the present invention, a temperature control method for an intelligent power module based on a gallium nitride power chip further includes: performing a frequency sudden drop operation on a compressor connected to the intelligent power module according to the sudden drop frequency and the sudden drop time.

[0016] As an embodiment of the present invention, a temperature control method for an intelligent power module based on a gallium nitride power chip further includes: when the module temperature of the intelligent power module is less than the preset temperature safety value, performing a frequency reduction operation on the compressor connected to the intelligent power module at a normal preset frequency reduction speed.

[0017] The beneficial effects of the present invention are:

[0018] The present invention provides a temperature control method for an intelligent power module based on a gallium nitride power chip. By adopting a phased temperature control method, when the intelligent power module is in a poor heat dissipation situation, the frequency is suddenly decreased in stages to control the temperature drop of the intelligent power module, achieving the effect of quickly cooling the intelligent power module without causing adverse effects on the normal operation of the equipment connected to the intelligent power module due to excessive sudden changes in frequency.

[0019] Other features and advantages of the present invention will be described in the following specification, and, in part, will be obvious from the specification, or will be understood by implementing the present invention. The objectives and other advantages of the present invention can be achieved and obtained by the structures specifically pointed out in the written specification and the drawings.

[0020] The technical solution of the present invention will be further described in detail below through the drawings and embodiments. Description of the Drawings

[0021] The drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention. In the drawings:

[0022] Figure 1 It is a flowchart of a temperature control method for an intelligent power module based on a gallium nitride power chip in an embodiment of the present invention;

[0023] Figure 2 It is a specific flowchart of step 2 in a temperature control method for an intelligent power module based on a gallium nitride power chip in an embodiment of the present invention;

[0024] Figure 3 It is a specific flowchart of step 3 in a temperature control method for an intelligent power module based on a gallium nitride power chip in an embodiment of the present invention. Detailed Embodiments

[0025] The following describes the preferred embodiments of the present invention with reference to the drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention and are not used to limit the present invention.

[0026] Please refer to Figure 1, an embodiment of the present invention provides a temperature control method for an intelligent power module based on a gallium nitride power chip, including the following steps: Step 1, obtain the module temperature of the intelligent power module, and determine whether there is poor heat dissipation in the intelligent power module when the module temperature is greater than the preset temperature control threshold; Step 2, if there is poor heat dissipation, obtain the basic heating efficiency, and determine the sudden drop frequency and sudden drop time according to the sudden drop condition, the basic heating efficiency and the preset temperature control threshold; Step 3, after the sudden drop time, obtain the current module temperature and the current basic heating efficiency, and determine the new sudden drop frequency and sudden drop time according to the sudden drop condition, the current basic heating efficiency and the current module temperature; Step 4, repeat Step 3 until the module temperature is less than the preset temperature safety value and then end;

[0027] The working principle of the above technical solution is as follows: An intelligent power module based on a gallium nitride power chip includes a drive module, a power module and a heat dissipation module. Among them, a preset number of silicon chips and gallium nitride chips are arranged on the power module, and a corresponding number of drive chips are arranged on the drive module. The heat dissipation module is used to dissipate heat from the entire intelligent power module; The temperature control method of the intelligent power module includes: First, obtain the module temperature of the intelligent power module through a device that monitors the temperature of the intelligent power module. When the module temperature is greater than the preset temperature control threshold, determine whether there is poor heat dissipation in the intelligent power module. The preset temperature control threshold is a judgment threshold for determining whether to reduce the frequency and temperature of the intelligent power module. The preset temperature control threshold is preferably a temperature value with a certain safety distance from the critical temperature of the intelligent power module. For example, if the critical temperature of the intelligent power module is X, the preset temperature control threshold is Y, and X>Y, X - Y = Z, where Z is the set safety value; If the judgment result is that there is poor heat dissipation in the current intelligent power module, obtain the basic heating efficiency of the intelligent power module. The basic heating efficiency preferably includes the overall heating efficiency of the intelligent power module after heat dissipation by the heat dissipation module. Then, determine the sudden drop frequency and sudden drop time according to the sudden drop condition, the basic heating efficiency and the preset temperature control threshold. At the same time, control the compressor connected to the intelligent power module to reduce the frequency according to the sudden drop frequency, and maintain the sudden drop time according to the sudden drop frequency. After the sudden drop time, obtain the current module temperature and the current basic heating efficiency of the intelligent power module, and at the same time determine the new sudden drop frequency and sudden drop time according to the sudden drop condition, the current basic heating efficiency and the current module temperature, and control the compressor connected to the intelligent power module to reduce the frequency according to the new sudden drop frequency, and maintain the new sudden drop time according to the new sudden drop frequency. Repeat the above steps, with staged frequency sudden drops until the module temperature is less than the preset temperature safety value and then end the frequency sudden drop, and change to the normal frequency reduction method, that is, the slow and uniform frequency reduction method;

[0028] The beneficial effects of the above technical solution are as follows: Through the above technical solution, by adopting the method of staged temperature control, when the intelligent power module is in a poor heat dissipation situation, the frequency is suddenly decreased in stages to control the temperature drop of the intelligent power module, achieving the effect of quickly cooling the intelligent power module without causing adverse effects on the normal operation of the equipment connected to the intelligent power module due to excessive sudden changes in frequency.

[0029] In one embodiment, the steps of determining whether there is poor heat dissipation in the intelligent power module include: within a unit time, calculating the module temperature change value between the current module temperature and the module temperature obtained in the previous acquisition; obtaining the operating current of the intelligent power module control device and the preset unit time heat dissipation temperature change value; if the operating current is less than the preset overclocking operating current and the module temperature change value is greater than the preset unit time heat dissipation temperature change value, it is determined that the intelligent power module has poor heat dissipation.

[0030] In one embodiment, the sudden drop conditions include: a sudden drop frequency ratio gradient table, a temperature change ratio gradient table, and a sudden drop frequency safe frequency conversion time gradient table; among them, the sudden drop frequency ratio gradient table includes the sudden drop frequency ratios that can be gradually maximally dropped through experiments without affecting the normal operation of the equipment provided with the intelligent power module; the temperature change ratio gradient table includes the temperature change ratios that change gradually through experiments corresponding to the sudden drop frequency ratios on the premise that the module temperature of the intelligent power module does not exceed the critical temperature; the temperature change ratio includes either the temperature decrease ratio or the temperature increase ratio; the sudden drop frequency safe frequency conversion time gradient table includes the safe frequency conversion time corresponding to the sudden drop frequency ratio obtained through experiments.

[0031] The working principle of the above technical solution is as follows: Preferably, based on the fact that the sudden frequency drop will not affect the normal operation of the intelligent power module connection device, and the phased sudden frequency drop will not cause damage to the intelligent power module due to untimely temperature drop, the sudden drop conditions are constructed. Usually, the sudden drop conditions include a sudden drop frequency ratio gradient table, a temperature change ratio gradient table, and a sudden drop frequency safe frequency conversion time gradient table. The sudden drop frequency ratio gradient table and the sudden drop frequency safe frequency conversion time gradient table are used to ensure that the sudden drop frequency will not affect the normal operation of the intelligent power module connection device, while the temperature change ratio gradient table is used to ensure that the phased sudden frequency drop during the sudden drop will not cause damage to the intelligent power module due to untimely temperature drop. Among them, the sudden drop frequency ratio gradient table includes the sudden drop frequency ratio that can be gradually maximally dropped without affecting the normal operation of the device equipped with the intelligent power module obtained through experiments. This experiment includes, but is not limited to, analyzing a large amount of data based on big data technology. The meaning of "gradually maximally dropped" preferably means that, for example, if the device currently equipped with the intelligent power module is a certain model of air conditioner, and through big data research and analysis, it is found that when the air conditioner is operating normally, the frequency is 50hz, and when operating at 50hz, a sudden drop frequency range of 0 - 6hz will not affect its normal operation. Then the sudden drop frequency ratio of the first-stage maximum sudden drop is 3 / 25. After the first sudden drop, the frequency drops to 44hz. At this time, according to the sudden drop frequency range that will not affect the normal operation of the air conditioner after the first sudden drop obtained through big data research and analysis of this model of air conditioner, the sudden drop frequency ratio of the second-stage maximum sudden drop is determined, and so on to form the sudden drop frequency ratio gradient table; The temperature change ratio gradient table includes the temperature change ratio that changes gradually under the premise that the module temperature of the intelligent power module does not exceed the critical temperature corresponding to the sudden drop frequency ratio; The temperature change ratio includes either the temperature decrease ratio or the temperature increase ratio; Among them, during the first-stage cooling, since the frequency drop is not significant, there is a situation where the intelligent power module is still in the heating state after the frequency drop, but the heating speed becomes slower than before the cooling. By analyzing the temperature change values corresponding to the data in a large number of sudden drop frequency ratio gradient tables through big data technology, the temperature change ratio at which the module temperature of the intelligent power module does not exceed the critical temperature at any sudden drop stage is obtained. In the first few stages of the sudden drop, the temperature change ratio is usually the temperature increase ratio, and in the last few stages of the sudden drop, the temperature change ratio is usually the temperature decrease ratio. The critical temperature is the temperature at which the intelligent cooling module just gets damaged; The sudden drop frequency safe frequency conversion time gradient table includes the safe frequency conversion time corresponding to the sudden drop frequency ratio obtained through experiments; that is, the safe time obtained by analyzing a large amount of data through big data technology, which is the time after running at the frequency corresponding to the sudden drop frequency ratio for how long before the next sudden drop will not affect the normal operation of the device equipped with the intelligent power module.

[0032] The beneficial effects of the above technical solution are as follows: By setting the sudden drop condition, data support is provided for the phased sudden drop frequency temperature control, improving the feasibility of the phased sudden drop and the temperature drop efficiency.

[0033] Please refer to Figure 2 , in one embodiment, step 2 specifically includes: S101. If there is poor heat dissipation, obtain the module temperature change value and calculate the basic temperature rise efficiency of the intelligent power module; S102. Obtain the first temperature change ratio in the temperature change ratio gradient table, and determine the first temperature threshold according to the first temperature change ratio and the preset temperature control threshold; S103. Obtain the current frequency of the intelligent power module and the first sudden drop frequency ratio in the sudden drop frequency ratio gradient table, and determine the sudden drop frequency according to the first sudden drop frequency ratio and the current frequency; S104. Obtain the standard temperature drop efficiency corresponding to the sudden drop frequency, and calculate the estimated first time for the intelligent power module to change from the preset temperature control threshold to the first temperature threshold according to the basic temperature rise efficiency and the standard temperature drop efficiency; S105. Determine whether the estimated first time is greater than the first safe frequency conversion time in the sudden drop frequency safe frequency conversion time gradient table; S106. Determine the sudden drop time according to the judgment result.

[0034] The working principle of the above technical solution is as follows: If there is poor heat dissipation, obtain the module temperature change value and calculate the basic temperature rise efficiency of the intelligent power module; the basic temperature rise efficiency is preferably calculated as the rate of temperature rise within the time period from the module temperature obtained last time to the current module temperature per unit time; at the same time, obtain the first temperature change ratio in the temperature change ratio gradient table; determine the first temperature threshold according to the first temperature change ratio and the preset temperature control threshold, and the determination method is preferably A = B * C + C, where A is the first temperature threshold, B is the first temperature change ratio. If the first temperature change ratio is the temperature increase ratio, then B is a positive number. If the first temperature change ratio is the temperature decrease ratio, then B is a negative number, and C is the preset temperature control threshold; obtain the current frequency of the intelligent power module and the first sudden drop frequency ratio in the sudden drop frequency ratio gradient table; determine the sudden drop frequency according to the first sudden drop frequency ratio and the current frequency, and the determination method is preferably D = E - E * F, where D is the sudden drop frequency, E is the current frequency, and F is the first sudden drop frequency ratio; obtain the standard temperature drop efficiency corresponding to the sudden drop frequency, and the standard temperature drop efficiency corresponding to the sudden drop frequency is preferably the average temperature drop efficiency obtained by analyzing a large number of corresponding sudden drop frequencies in advance; calculate the estimated first time for the intelligent power module to change from the preset temperature control threshold to the first temperature threshold according to the basic temperature rise efficiency and the standard temperature drop efficiency, and the calculation method is preferably T = (G - H) / (I + J), where G is the first temperature threshold, H is the preset temperature control threshold, T is the estimated first time, I is the basic temperature rise efficiency, and J is the standard temperature drop efficiency, where J is a negative number; determine whether the estimated first time is greater than the first safe frequency conversion time in the sudden drop frequency safe frequency conversion time gradient table; determine the sudden drop time according to the judgment result.

[0035] The beneficial effects of the above technical solution are as follows: Through the above technical solution, the first stage of the phased temperature control is completed, and the temperature drop efficiency is improved.

[0036] In one embodiment, determining the sudden drop time according to the judgment result includes: if the judgment result is greater than, taking the first safety frequency conversion time as the sudden drop time; if the judgment result is not greater than, taking the predicted first time as the sudden drop time.

[0037] Please refer to Figure 3 , in one embodiment, step 3 specifically includes: S201. After the sudden drop time, obtain the current module temperature, and determine the second module temperature change value according to the current module temperature and the preset temperature control threshold; S202. Calculate the current basic heating efficiency of the intelligent power module according to the second module temperature change value; S203. Obtain the second temperature change ratio in the temperature change ratio gradient table, and determine the second temperature threshold according to the second temperature change ratio and the current module temperature; S204. Obtain the second sudden drop frequency ratio in the sudden drop frequency ratio gradient table, and determine the new sudden drop frequency according to the second sudden drop frequency ratio and the sudden drop frequency; S205. Obtain the standard improved temperature drop efficiency corresponding to the new sudden drop frequency on the basis of the sudden drop frequency; S206. Calculate the temperature error between the current module temperature and the first temperature threshold, and determine the efficiency error coefficient according to the temperature error; S207. Correct the standard improved temperature drop efficiency according to the efficiency error coefficient to obtain the corrected improved temperature drop efficiency; S208. Calculate the predicted second time for the intelligent power module to change from the current module temperature to the second temperature threshold according to the current basic heating efficiency and the corrected improved temperature drop efficiency; S209. Determine whether the predicted second time is greater than the second safety frequency conversion time in the sudden drop frequency safety frequency conversion time gradient table; S210. Determine the new sudden drop time according to the judgment result;

[0038] The working principle of the above technical solution is as follows: After the sudden drop time, the current module temperature is obtained, and the second module temperature change value is determined according to the current module temperature and the preset temperature control threshold; the determination method is preferably the absolute value of the current module temperature minus the preset temperature control threshold; further, when repeating step 3, the preset temperature control threshold is changed to the previous module temperature; the current basic temperature rise efficiency of the intelligent power module is calculated according to the second module temperature change value, that is, the rate of temperature rise during the sudden drop time from the preset temperature control threshold to the current module temperature is calculated; the second temperature change ratio in the temperature change ratio gradient table is obtained; the second temperature threshold is determined according to the second temperature change ratio and the current module temperature; the calculation method of the second temperature threshold is preferably the same as that of the first temperature threshold; the second sudden drop frequency ratio in the sudden drop frequency ratio gradient table is obtained, and the new sudden drop frequency is determined according to the second sudden drop frequency ratio and the sudden drop frequency; the determination method is preferably the same as the determination method of the sudden drop frequency in step 2; the standard improved temperature drop efficiency corresponding to the new sudden drop frequency on the basis of the sudden drop frequency is obtained; the standard improved temperature drop efficiency is preferably the part of the temperature drop efficiency that the standard temperature drop efficiency of the current new sudden drop frequency is higher than the standard temperature drop efficiency corresponding to the previous sudden drop frequency; the temperature error between the current module temperature and the first temperature threshold is calculated, and the efficiency error coefficient is determined according to the temperature error; the standard improved temperature drop efficiency is corrected according to the efficiency error coefficient to obtain the corrected improved temperature drop efficiency, and the correction method is preferably P = O * L, where P is the corrected improved temperature drop efficiency, O is the efficiency error coefficient, and L is the standard improved temperature drop efficiency; the predicted second time for the intelligent power module to change from the current module temperature to the second temperature threshold is calculated according to the current basic temperature rise efficiency and the corrected improved temperature drop efficiency; the calculation method of the predicted second time is preferably the same as the calculation method of the predicted first time, where the standard temperature drop efficiency is changed to the corrected improved temperature drop efficiency; it is judged whether the predicted second time is greater than the second safe frequency conversion time in the sudden drop frequency safety frequency conversion time gradient table; the new sudden drop time is determined according to the judgment result.

[0039] The beneficial effects of the above technical solution are as follows: Through the above technical solution, the subsequent stages of the phased temperature control except the first stage are completed, and the temperature drop efficiency is improved.

[0040] In one embodiment, determining the new sudden drop time according to the judgment result includes: if the judgment result is greater than, taking the second safe frequency conversion time as the new sudden drop time; if the judgment result is not greater than, taking the predicted second time as the new sudden drop time.

[0041] In one embodiment, determining the efficiency error coefficient according to the temperature error includes: re-correcting the standard temperature drop efficiency according to the temperature error to obtain the corrected corrected temperature drop efficiency; determining the efficiency error coefficient according to the standard temperature drop efficiency and the corrected corrected temperature drop efficiency.

[0042] The working principle and beneficial effects of the above technical solution are as follows: In actual situations, as the service life of the intelligent power module and the device equipped with the intelligent power module increases, there may be certain errors in the standard temperature drop efficiency corresponding to its corresponding frequency. Therefore, after each sudden drop, the efficiency error coefficient is determined according to the actual temperature error, so as to determine the efficiency error coefficient for the corresponding temperature drop efficiency after each sudden drop, thereby improving the control accuracy of the temperature control with staged sudden drop frequencies. Among them, re-calibrating the standard temperature drop efficiency according to the temperature error specifically means establishing a functional relationship based on the preset temperature control threshold, the first temperature threshold, the sudden drop time, the basic heating efficiency, and the standard temperature drop efficiency, and then replacing the first temperature threshold with the current module temperature, while keeping the values of the sudden drop time, the preset temperature control threshold, and the basic heating efficiency unchanged, to solve for the new standard temperature drop efficiency as the calibrated temperature drop efficiency, and then determining the efficiency error coefficient according to the ratio of the standard temperature drop efficiency and the calibrated temperature drop efficiency.

[0043] In one embodiment, a temperature control method for an intelligent power module based on a gallium nitride power chip further includes: performing a frequency sudden drop operation on the compressor connected to the intelligent power module according to the sudden drop frequency and the sudden drop time.

[0044] In one embodiment, a temperature control method for an intelligent power module based on a gallium nitride power chip further includes: when the module temperature of the intelligent power module is less than the preset temperature safety value, performing a frequency reduction operation on the compressor connected to the intelligent power module at the normal preset frequency reduction speed.

[0045] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these changes and modifications.

Claims

1. A temperature control method for an intelligent power module based on a gallium nitride power chip, characterized in that It includes the following steps: Step 1, obtain the module temperature of the intelligent power module, and determine whether there is poor heat dissipation in the intelligent power module when the module temperature is greater than the preset temperature control threshold; Step 2, if there is poor heat dissipation, obtain the basic temperature rise efficiency, and determine the sudden drop frequency and sudden drop time according to the sudden drop condition, the basic temperature rise efficiency and the preset temperature control threshold; Step 3, after the sudden drop time, obtain the current module temperature and the current basic temperature rise efficiency, and determine the new sudden drop frequency and sudden drop time according to the sudden drop condition, the current basic temperature rise efficiency and the current module temperature; Step 4, repeat Step 3 until the module temperature is less than the preset temperature safety value and then end; The sudden drop conditions include: a sudden drop frequency ratio gradient table, a temperature change ratio gradient table, and a sudden drop frequency safety frequency conversion time gradient table; among them, the sudden drop frequency ratio gradient table includes the sudden drop frequency ratios that can be gradually maximally dropped through experiments without affecting the normal operation of the device equipped with the intelligent power module; the temperature change ratio gradient table includes the temperature change ratios that change step by step on the premise that the module temperature of the intelligent power module does not exceed the critical temperature corresponding to the sudden drop frequency ratio; the temperature change ratio includes either the temperature decrease ratio or the temperature increase ratio; the sudden drop frequency safety frequency conversion time gradient table includes the safety frequency conversion time corresponding to the sudden drop frequency ratio obtained through experiments; Step 2 specifically includes: if there is poor heat dissipation, obtain the module temperature change value and calculate the basic temperature rise efficiency of the intelligent power module; obtain the first temperature change ratio in the temperature change ratio gradient table; determine the first temperature threshold according to the first temperature change ratio and the preset temperature control threshold; obtain the current frequency of the intelligent power module and the first sudden drop frequency ratio in the sudden drop frequency ratio gradient table; determine the sudden drop frequency according to the first sudden drop frequency ratio and the current frequency; obtain the standard temperature drop efficiency corresponding to the sudden drop frequency; calculate the estimated first time for the intelligent power module to change from the preset temperature control threshold to the first temperature threshold according to the basic temperature rise efficiency and the standard temperature drop efficiency; judge whether the estimated first time is greater than the first safety frequency conversion time in the sudden drop frequency safety frequency conversion time gradient table; determine the sudden drop time according to the judgment result; It also includes: performing a frequency sudden drop operation on the compressor connected to the intelligent power module according to the sudden drop frequency and the sudden drop time.

2. The temperature control method of an intelligent power module based on a gallium nitride power chip according to claim 1, wherein, The steps for judging whether there is poor heat dissipation in the intelligent power module include: within a unit time, calculate the module temperature change value between the current module temperature and the module temperature obtained in the previous time; obtain the operating current of the intelligent power module control device and the preset unit time heat dissipation temperature change value; if the operating current is less than the preset overclocking operating current and the module temperature change value is greater than the preset unit time heat dissipation temperature change value, it is determined that there is poor heat dissipation in the intelligent power module.

3. The temperature control method of an intelligent power module based on a gallium nitride power chip according to claim 1, wherein Determining the sudden drop time according to the judgment result includes: if the judgment result is greater, taking the first safety frequency conversion time as the sudden drop time, and if the judgment result is not greater, taking the estimated first time as the sudden drop time.

4. A temperature control method for an intelligent power module based on a gallium nitride power chip according to claim 1, characterized in that Step 3 specifically includes: after the sudden drop time, obtaining the current module temperature, determining the second module temperature change value according to the current module temperature and the preset temperature control threshold; calculating the current basic temperature rise efficiency of the intelligent power module according to the second module temperature change value; obtaining the second temperature change ratio in the temperature change ratio gradient table; determining the second temperature threshold according to the second temperature change ratio and the current module temperature; obtaining the second sudden drop frequency ratio in the sudden drop frequency ratio gradient table, and determining the new sudden drop frequency according to the second sudden drop frequency ratio and the sudden drop frequency; obtaining the standard temperature rise and drop efficiency corresponding to the increase on the basis of the sudden drop frequency for the new sudden drop frequency; calculating the temperature error between the current module temperature and the first temperature threshold, and determining the efficiency error coefficient according to the temperature error; correcting the standard temperature rise and drop efficiency according to the efficiency error coefficient to obtain the corrected temperature rise and drop efficiency; calculating the estimated second time for the intelligent power module to change from the current module temperature to the second temperature threshold according to the current basic temperature rise efficiency and the corrected temperature rise and drop efficiency; determining whether the estimated second time is greater than the second safe frequency conversion time in the sudden drop frequency safety frequency conversion time gradient table; and determining the new sudden drop time according to the judgment result.

5. The temperature control method of an intelligent power module based on a gallium nitride power chip according to claim 4, characterized in that, Determining the new sudden drop time according to the judgment result includes: if the judgment result is greater than, taking the second safe frequency conversion time as the new sudden drop time; if the judgment result is not greater than, taking the estimated second time as the new sudden drop time.

6. The temperature control method of an intelligent power module based on a gallium nitride power chip according to claim 4, wherein, Determining the efficiency error coefficient according to the temperature error includes: re-correcting the standard temperature drop efficiency according to the temperature error to obtain the corrected temperature drop efficiency after correction; and determining the efficiency error coefficient according to the standard temperature drop efficiency and the corrected temperature drop efficiency.

7. A temperature control method for an intelligent power module based on a gallium nitride power chip according to claim 1, characterized in that, It also includes: When the module temperature of the intelligent power module is less than the preset temperature safety value, performing a frequency reduction operation on the compressor connected to the intelligent power module at the normal preset frequency reduction speed.

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