A temperature control method for an intelligent power module and a variable frequency range hood

Abstract

The present application relates to the technical field of variable frequency range hoods, and in particular to a temperature control method for an intelligent power module and a variable frequency range hood. The variable frequency range hood includes an intelligent power module and an ambient temperature sensor. The ambient temperature sensor is arranged in a closed and insulated space where the intelligent power module is located, and is used to collect the temperature of the medium in the closed and insulated space. When the intelligent power module is started, a first temperature signal voltage and a first medium temperature are obtained. When the intelligent power module stops working, a second temperature signal voltage and a second medium temperature are obtained. After the intelligent power module stops working, when the temperature signal voltage is the first temperature signal voltage, a third medium temperature is obtained. Then, the linear relationship parameter corresponding to the temperature signal voltage of the intelligent power module and the substrate temperature is determined. For intelligent power modules from different manufacturers, the temperature control method of the intelligent power module provided by the present application can be used to determine the corresponding relationship between the temperature signal voltage and the substrate temperature.

Description

Technical Field

[0001] The present application relates to the technical field of variable frequency range hoods, and in particular to a temperature control method for an intelligent power module and a variable frequency range hood. Background Art

[0002] Currently, the IPM (Intelligent Power Module) is a key driver module for variable-frequency range hoods. The controller drives the variable-frequency range hood by controlling the IPM. The IPM's internal chip is equipped with a temperature sensor to measure the chip's heat sink temperature, which indicates the chip's substrate temperature. When the temperature sensor detects that the chip's substrate temperature exceeds the over-temperature protection threshold, the over-temperature protection is activated, shutting down the gate drive circuit and outputting a fault signal.

[0003] There's a linear relationship between the substrate temperature of the IPM's internal chip and the temperature signal voltage output by the IPM, known as the temperature signal curve. However, the inverter range hood controller can't directly obtain the IPM's substrate temperature. Instead, it can only collect the IPM's output temperature signal voltage through a pin. Based on the corresponding relationship between the temperature signal voltage and substrate temperature in the temperature signal curve, the controller determines the substrate temperature corresponding to the temperature signal voltage. If the substrate temperature exceeds a preset temperature warning threshold, the controller controls the IPM to reduce output power to keep the substrate temperature below the over-temperature protection threshold.

[0004] However, different IPM manufacturers use different production processes, resulting in unique temperature signal curves for each IPM. This forces variable-frequency range hood manufacturers to develop a specific control program for each IPM they purchase to obtain the corresponding temperature signal curve. Developing numerous control programs is highly inconvenient for software management, leading to an urgent need for a temperature control method for intelligent power modules. Summary of the Invention

[0005] Based on this, it is necessary to provide a temperature control method for an intelligent power module and a variable frequency range hood to address the above technical problems.

[0006] In a first aspect, a temperature control method for an intelligent power module is provided, characterized in that the method is applied to a variable frequency range hood, the variable frequency range hood comprising an intelligent power module and an ambient temperature sensor, the ambient temperature sensor being disposed in a closed, heat-insulating space where the intelligent power module is located and configured to collect a medium temperature T of a heat-conducting medium in the closed, heat-insulating space, the method comprising:

[0007] When the intelligent power module is started, a first temperature signal voltage U1 output by the intelligent power module is obtained, and a first medium temperature T1 in the closed insulation space is collected through the ambient temperature sensor;

[0008] After the intelligent power module has been operating for a preset time, the intelligent power module is controlled to stop operating, a second temperature signal voltage U2 output by the intelligent power module is obtained, and a second medium temperature T2 in the closed adiabatic space is collected through the ambient temperature sensor;

[0009] After the intelligent power module stops working, when the acquired temperature signal voltage U output by the intelligent power module is equal to the first temperature signal voltage U1, collecting the third medium temperature T3 in the closed insulation space through the ambient temperature sensor;

[0010] A linear relationship parameter corresponding to the temperature signal voltage U of the intelligent power module and the substrate temperature t is determined according to the first temperature signal voltage U1, the first medium temperature T1, the second temperature signal voltage U2, the second medium temperature T2 and the third medium temperature T3.

[0011] As an optional implementation,

[0012] Determining a linear relationship parameter corresponding to the temperature signal voltage U of the intelligent power module and the substrate temperature t according to the first temperature signal voltage U1, the first medium temperature T1, the second temperature signal voltage U2, the second medium temperature T2, and the third medium temperature T3 includes:

[0013] Determine the first medium temperature T1 as the first substrate temperature t1 corresponding to the first temperature signal voltage U1;

[0014] determining, based on the third medium temperature T3, the second medium temperature T2, a preset heat conducting medium mass M, and a preset heat conducting medium specific heat capacity C1, a first heat quantity Q1 absorbed by the heat conducting medium when the temperature signal voltage U drops to the first temperature signal voltage U1 after the intelligent power module stops operating;

[0015] Determining the first heat Q1 absorbed by the heat-conducting medium as the second heat Q2 released by the intelligent power module;

[0016] Determining a second substrate temperature t2 corresponding to the second temperature signal voltage U2 according to a second heat Q2 released by the intelligent power module, the first substrate temperature t1, a preset substrate mass m, and a preset substrate specific heat capacity C2;

[0017] A linear relationship parameter corresponding to the temperature signal voltage U and the substrate temperature t of the intelligent power module is determined according to the first temperature signal voltage U1 , the first substrate temperature t1 , the second temperature signal voltage U2 , and the second substrate temperature t2 .

[0018] As an optional implementation,

[0019] The determining, based on the third medium temperature T3, the second medium temperature T2, a preset heat-conducting medium mass M, and a preset heat-conducting medium specific heat capacity C1, of a first heat quantity Q1 absorbed by the heat-conducting medium when the temperature signal voltage U drops to the first temperature signal voltage U1 after the intelligent power module stops operating, includes:

[0020] Q1=C1×M×(T3-T2).

[0021] As an optional implementation,

[0022] The determining, based on the second heat Q2 released by the intelligent power module, the first substrate temperature t1, a preset substrate mass m, and a preset substrate specific heat capacity C2, of the second substrate temperature t2 corresponding to the second temperature signal voltage U2 includes:

[0023] t2=Q2÷C2÷m+t1.

[0024] As an optional implementation,

[0025] The linear relationship parameters include a temperature signal curve slope k and a temperature signal curve intercept b. Determining the linear relationship parameters corresponding to the temperature signal voltage U and the substrate temperature t of the intelligent power module based on the first temperature signal voltage U1, the first substrate temperature t1, the second temperature signal voltage U2, and the second substrate temperature t2 includes:

[0026]

[0027]

[0028] As an optional implementation manner, the heat-conducting medium in the closed insulation space includes one or more of air, coolant, thermal grease, phase change material and thermal double-sided tape.

[0029] In the second aspect, a variable frequency range hood is provided.

[0030] The variable frequency range hood includes a controller, an intelligent power module and an ambient temperature sensor; wherein,

[0031] The ambient temperature sensor is used to collect the medium temperature T of the heat-conducting medium in the closed and adiabatic space where the intelligent power module is located;

[0032] The controller is configured to control the startup of the intelligent power module and obtain a first temperature signal voltage U1 output by the intelligent power module and a first medium temperature T1 in the closed thermal insulation space when the intelligent power module is started;

[0033] The controller is further configured to control the intelligent power module to stop working after the intelligent power module has worked for a preset period of time, and obtain a second temperature signal voltage U2 output by the intelligent power module and a second medium temperature T2 in the closed adiabatic space;

[0034] The controller is further configured to, after the intelligent power module stops working, when the acquired temperature signal voltage U output by the intelligent power module is the first temperature signal voltage U1, determine the temperature T3 of the third medium in the closed adiabatic space;

[0035] The controller is further configured to determine a linear relationship parameter corresponding to the temperature signal voltage U of the intelligent power module and the substrate temperature t based on the first temperature signal voltage U1, the first medium temperature T1, the second temperature signal voltage U2, the second medium temperature T2, and the third medium temperature T3.

[0036] As an optional implementation,

[0037] The controller is configured to determine the first medium temperature T1 as the first substrate temperature t1 corresponding to the first temperature signal voltage U1;

[0038] The controller is further configured to determine, based on the third medium temperature T3, the second medium temperature T2, a preset heat-conducting medium mass M, and a preset heat-conducting medium specific heat capacity C1, a first heat quantity Q1 absorbed by the heat-conducting medium when the temperature signal voltage U drops to the first temperature signal voltage U1 after the intelligent power module stops operating;

[0039] The controller is further configured to determine the first heat Q1 absorbed by the heat-conducting medium as the second heat Q2 released by the intelligent power module;

[0040] The controller is further configured to determine a second substrate temperature t2 corresponding to the second temperature signal voltage U2 based on a second heat Q2 released by the intelligent power module, the first substrate temperature t1, a preset substrate mass m, and a preset substrate specific heat capacity C2;

[0041] The controller is further configured to determine a linear relationship parameter corresponding to the temperature signal voltage U and the substrate temperature t of the intelligent power module based on the first temperature signal voltage U1, the first substrate temperature t1, the second temperature signal voltage U2, and the second substrate temperature t2.

[0042] As an optional implementation manner, the controller is used to calculate a first temperature difference between the temperature of the third medium and the temperature of the second medium;

[0043] The controller is further configured to determine, by multiplying the first temperature difference by a first product of the preset mass of the heat-conducting medium and a preset specific heat capacity of the heat-conducting medium, a first amount of heat absorbed by the heat-conducting medium when the temperature signal voltage drops to the first temperature signal voltage after the intelligent power module stops operating.

[0044] As an optional implementation manner, the controller is used to calculate a second product of the preset substrate mass and the preset substrate specific heat capacity;

[0045] The controller is further configured to calculate a quotient of a second amount of heat released by the intelligent power module and the second product;

[0046] The controller is further configured to determine a sum of the quotient and the first substrate temperature as the second substrate temperature corresponding to the second temperature signal voltage.

[0047] As an optional implementation manner, the controller is used to calculate a first voltage difference between the first temperature signal voltage and the second temperature signal voltage;

[0048] The controller is further configured to calculate a second temperature difference between the first substrate temperature and the second substrate temperature;

[0049] The controller is further configured to determine a quotient of the first voltage difference and the second temperature difference as a slope of the temperature signal curve;

[0050] The controller is further configured to calculate a third product of the first substrate temperature and the slope of the temperature signal curve;

[0051] The controller is further configured to determine a difference between the first temperature signal voltage and the third product as an intercept of the temperature signal curve.

[0052] The present application provides a temperature control method for an intelligent power module and a variable frequency range hood. The technical solution provided by the embodiments of the present application brings at least the following beneficial effects:

[0053] The method is applied to a variable frequency range hood, which includes an intelligent power module and an ambient temperature sensor. The ambient temperature sensor is disposed in a closed, heat-insulating space where the intelligent power module is located and is used to collect a medium temperature T of a heat-conducting medium in the closed, heat-insulating space. The method includes: when the intelligent power module is started, obtaining a first temperature signal voltage U1 output by the intelligent power module, and collecting the first medium temperature T1 in the closed, heat-insulating space through the ambient temperature sensor; after the intelligent power module has been operating for a preset period of time, controlling the intelligent power module to stop operating, obtaining a second temperature signal voltage U2 output by the intelligent power module, and collecting the second medium temperature T2 in the closed, heat-insulating space through the ambient temperature sensor; after the intelligent power module stops operating, when the obtained temperature signal voltage U output by the intelligent power module is equal to the first temperature signal voltage U1, collecting a third medium temperature T3 in the closed, heat-insulating space through the ambient temperature sensor;

[0054] Based on the first temperature signal voltage U1, the first medium temperature T1, the second temperature signal voltage U2, the second medium temperature T2, and the third medium temperature T3, the linear relationship parameter corresponding to the temperature signal voltage U of the intelligent power module and the substrate temperature t is determined. The present application collects the medium temperature of the heat-conducting medium by setting an ambient temperature sensor in the closed and adiabatic space where the intelligent power module is located. Based on the characteristic that the heat change of the substrate of the intelligent power module in the closed and adiabatic space is consistent with the heat change of the heat-conducting medium, combined with the specific heat capacity formula, the temperature change of the heat-conducting medium and the temperature change of the substrate in the same time period can be further determined, and then the linear relationship parameter corresponding to the temperature signal voltage of the intelligent power module and the substrate temperature can be determined, thereby obtaining the temperature signal curve corresponding to the intelligent power module, so that the corresponding substrate temperature can be determined according to any temperature signal voltage. Based on the temperature control method of the present application, automatic adaptation of temperature control of intelligent power modules from different manufacturers can be achieved, and there is no need to compile multiple control programs for different intelligent power modules, which is conducive to software management.

[0055] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0057] Figure 1A schematic structural diagram of a variable frequency range hood provided in an embodiment of the present application;

[0058] Figure 2 A flow chart of a temperature control method for an intelligent power module provided in an embodiment of the present application;

[0059] Figure 3 A flow chart of another temperature control method for an intelligent power module provided in an embodiment of the present application;

[0060] Figure 4 A schematic diagram of a temperature signal curve provided in an embodiment of the present application. DETAILED DESCRIPTION

[0061] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0062] The temperature control method of an intelligent power module provided in the embodiment of the present application can be applied to a variable frequency range hood. Figure 1 As shown, the variable frequency range hood includes a controller 110, an intelligent power module 120, and an ambient temperature sensor 130. The ambient temperature sensor is located in the enclosed, insulated space where the intelligent power module 120 is located and is connected to the controller 110 of the variable frequency range hood. The controller 110 of the variable frequency range hood collects the medium temperature T of the heat-conducting medium in the enclosed, insulated space through the ambient temperature sensor 130, and the controller 110 obtains the temperature signal voltage U output by the intelligent power module 120.

[0063] The following will describe in detail a temperature control method for an intelligent power module provided by an embodiment of the present application in conjunction with specific implementation methods. Figure 2 A flow chart of a temperature control method for an intelligent power module provided in an embodiment of the present application is shown in FIG. Figure 2 The specific steps are as follows:

[0064] Step 201 : When the intelligent power module is started, a first temperature signal voltage U1 output by the intelligent power module is obtained, and a first medium temperature T1 in a closed thermal insulation space is collected through an ambient temperature sensor.

[0065] In implementation, a substrate temperature sensor is installed near the insulating substrate of the IGBT (Insulated Gate Bipolar Transistor) chip within the intelligent power module. This temperature sensor is used to collect the temperature of the heat sink within the intelligent power module. The heat sink temperature can represent the substrate temperature t of the intelligent power module. The substrate temperature t is linearly related to the temperature signal voltage of the intelligent power module. When the intelligent power module starts up, the controller obtains the first temperature signal voltage U1 output by the intelligent power module. The first temperature signal voltage U1 corresponds to the first substrate temperature t1. Heat conduction can only occur due to a temperature difference between objects. Before the intelligent power module starts up, the substrate and the heat-conducting medium within the closed, insulated space reach the same temperature due to heat transfer. At the moment the intelligent power module starts up, the substrate temperature does not change significantly and remains equal to the medium temperature of the heat-conducting medium. That is, the first substrate temperature t1 is equal to the first medium temperature T1 at the time of the intelligent power module startup. Therefore, the controller can use the ambient temperature sensor to collect the first medium temperature T1 within the closed, insulated space and determine the first medium temperature T1 as the first substrate temperature t1.

[0066] Step 202 : After the intelligent power module works for a preset time, the intelligent power module is controlled to stop working, a second temperature signal voltage U2 output by the intelligent power module is obtained, and the second medium temperature T2 in the closed insulation space is collected through the ambient temperature sensor.

[0067] During implementation, after the intelligent power module operates for a preset duration, the controller controls the intelligent power module to stop operating, obtains the second temperature signal voltage U2 output by the intelligent power module, and uses the ambient temperature sensor to collect the second medium temperature T2 within the enclosed, adiabatic space. During the preset operating duration of the intelligent power module, as the power of the intelligent power module increases, the substrate temperature t increases. As the substrate temperature increases, heat conduction occurs in the thermally conductive medium, and the temperature of the thermally conductive medium also increases. For example: if the second temperature signal voltage is U2, the second medium temperature is T2, and the second substrate temperature is t2, then T2 is greater than T1, and t2 is greater than t1, but the value of t2 is unknown. Based on the linear relationship between the temperature signal voltage and the substrate temperature, it can be seen that the second temperature signal voltage U2 corresponds to the second substrate temperature t2 within the intelligent power module.

[0068] Step 203 : After the intelligent power module stops working, when the acquired temperature signal voltage U output by the intelligent power module is equal to the first temperature signal voltage U1 , the third medium temperature T3 in the closed insulation space is collected by the ambient temperature sensor.

[0069] During operation, the intelligent power module converts some electrical energy into heat, causing the internal temperature of the intelligent power module to rise. The controller cannot directly obtain the substrate temperature t, as measured by the temperature sensor within the intelligent power module. However, the medium temperature of the thermally conductive medium changes due to heat conduction from the substrate. Therefore, within the closed, insulated space, the thermally conductive medium and the substrate gradually transfer heat from the higher-temperature object to the lower-temperature object through heat conduction until there is no temperature difference between them. During this process, the heat released by the higher-temperature object is equal to the heat absorbed by the lower-temperature object. According to the heat calculation formula, the controller can determine the amount of heat absorbed or released by the thermally conductive medium based on the change in the medium temperature of the thermally conductive medium, and thus the amount of heat released or absorbed by the substrate. When the intelligent power module stops operating, no current is flowing, and electrical energy is no longer converted into heat. The substrate temperature t begins to decrease, and the heat released by the substrate is absorbed by the thermally conductive medium, causing the temperature of the thermally conductive medium to increase. As the substrate temperature drops from the second substrate temperature t2 to the first substrate temperature t1, the temperature signal voltage U output by the intelligent power module also drops from the second temperature signal voltage U2 to the first temperature signal voltage U1. During this process, the heat Q2 released by the substrate as it drops from the second substrate temperature t2 to the first substrate temperature t1 is absorbed by the heat transfer medium, causing the heat transfer medium's temperature T to rise from the second medium temperature T2 to the third medium temperature T3. Therefore, the controller can determine the heat Q1 absorbed by the heat transfer medium, i.e., the heat Q2 released by the substrate, based on the second medium temperature T2 and the third medium temperature T3, in conjunction with the heat calculation formula. Therefore, when the controller obtains the temperature signal voltage U output by the intelligent power module as the first temperature signal voltage U1, the controller uses the ambient temperature sensor to collect the third medium temperature T3 within the enclosed, adiabatic space.

[0070] Step 204 : Determine the linear relationship parameter between the temperature signal voltage U of the intelligent power module and the substrate temperature t according to the first temperature signal voltage U1 , the first medium temperature T1 , the second temperature signal voltage U2 , the second medium temperature T2 , and the third medium temperature T3 .

[0071] In implementation, the controller determines the linear relationship parameters corresponding to the temperature signal voltage U1 of the intelligent power module and the substrate temperature t based on the first temperature signal voltage U1, the first medium temperature T1, the second temperature signal voltage U2, the second medium temperature T2 and the third medium temperature T3.

[0072] As an optional implementation, Figure 3 This is a flow chart of another temperature control method for an intelligent power module provided in an embodiment of the present application, such as Figure 3As shown, the controller has a first temperature signal voltage U1, a first medium temperature T1, a second temperature signal voltage U2, a second medium temperature T2, and a third medium temperature T3. The specific steps of determining the linear relationship parameters corresponding to the temperature signal voltage U of the intelligent power module and the substrate temperature t are as follows:

[0073] Step 301 : determining the first medium temperature T1 as the first substrate temperature t1 corresponding to the first temperature signal voltage U1 .

[0074] In practice, at the moment the intelligent power module is started, the substrate temperature t has not yet risen. Therefore, the controller can determine the first medium temperature T1 in the closed adiabatic space as the first substrate temperature t1 corresponding to the first temperature signal voltage U1. That is, the first substrate temperature t1 corresponding to the first temperature signal voltage U1 is equal to the first medium temperature T1.

[0075] Step 302 : Determine, based on the third medium temperature T3 , the second medium temperature T2 , the preset heat transfer medium mass M , and the preset heat transfer medium specific heat capacity C1 , a first heat quantity Q1 absorbed by the heat transfer medium when the temperature signal voltage U drops to the first temperature signal voltage U1 after the intelligent power module stops operating.

[0076] In implementation, after the intelligent power module stops working, the controller can determine the first heat Q1 absorbed by the heat-conducting medium when the temperature signal voltage U drops to the first temperature signal voltage U1 after the intelligent power module stops working based on the third medium temperature T3, the second medium temperature T2, the preset heat-conducting medium mass M and the preset heat-conducting medium specific heat capacity C1.

[0077] Optionally, the controller determines, based on the third medium temperature T3, the second medium temperature T2, a preset heat-conducting medium mass M, and a preset heat-conducting medium specific heat capacity C1, a formula for determining a first heat quantity Q1 absorbed by the heat-conducting medium when the temperature signal voltage U drops to the first temperature signal voltage U1 after the intelligent power module stops operating, as follows:

[0078] Q1=C1×M×(T3-T2).

[0079] In practice, the basic formula for heat is Q = C × M × ΔT, where Q is the amount of heat absorbed or released by the medium, C is the specific heat capacity of the medium, M is the mass of the medium, and ΔT is the temperature change during the absorption or release of heat. Table 1 is a comparison table of temperature signal voltage, medium temperature, and substrate temperature provided in an embodiment of the present application, as shown in Table 1:

[0080]

[0081] After the intelligent power module stops operating and the temperature signal voltage drops to the first temperature signal voltage, the change in the thermal medium temperature ΔT1 = T3 - T2. Based on the basic heat formula (Q = C × M × ΔT) and the preset medium specific heat capacity C1 and medium mass M, the first amount of heat Q1 absorbed by the thermal medium can be determined. Specifically, Q1 = C1 × M × ΔT1 = C1 × M × (T3 - T2). The medium mass M can be calculated based on the density and volume of the thermal medium.

[0082] Step 303 : determining the first heat Q1 absorbed by the heat-conducting medium as the second heat Q2 released by the intelligent power module.

[0083] During implementation, after the intelligent power module stops working, the temperature of the substrate of the intelligent power module decreases and the temperature of the heat-conducting medium increases. In the closed insulating space, the heat changes of the substrate and the heat-conducting medium are equal. Therefore, the first heat Q1 absorbed by the heat-conducting medium determined in step 302 can be determined as the second heat Q2 released by the intelligent power module (substrate), that is, Q1=Q2.

[0084] Step 304 : determining a second substrate temperature t2 corresponding to the second temperature signal voltage U2 according to the second heat Q2 released by the intelligent power module, the first substrate temperature t1 , a preset substrate mass m, and a preset substrate specific heat capacity C2 .

[0085] In implementation, the controller can determine the second substrate temperature t2 corresponding to the second temperature signal voltage U2 based on the heat calculation formula, when the second heat Q2 released by the intelligent power module, the first substrate temperature t1, the preset substrate mass m and the preset substrate specific heat capacity C2 are known.

[0086] Optionally, the controller determines the second substrate temperature corresponding to the second temperature signal voltage according to the following formula based on the second heat released by the intelligent power module, the first substrate temperature, a preset substrate mass, and a preset substrate specific heat capacity:

[0087] t2=Q2÷C2÷m+t1.

[0088] In implementation, as shown in Table 1, after the intelligent power module stops working, when the temperature signal voltage drops to the first temperature signal voltage, the change in substrate temperature ΔT2 = t2-t1 (taking a positive value), according to the basic heat formula Q = C×M×ΔT and the preset substrate specific heat capacity C2 and substrate mass m (wherein, the specific heat capacity C2 and mass m of the substrate can be determined by querying material information), the following formula can be obtained: Q2 = C2×m×ΔT2, where ΔT2 = t2-t1, Q2 = Q1, and it can be further deduced that t2 = Q2÷C2÷m+t1 = Q2÷C2÷m+T1 = Q1÷C2÷m+T1 = C1×M1×(T3-T2)÷C2÷m+T1.

[0089] Step 305 : Determine the linear relationship parameter between the temperature signal voltage U and the substrate temperature t of the intelligent power module according to the first temperature signal voltage U1 , the first substrate temperature t1 , the second temperature signal voltage U2 and the second substrate temperature t2 .

[0090] In implementation, the controller may determine the linear relationship parameter corresponding to the temperature signal voltage U and the substrate temperature t of the intelligent power module according to the first temperature signal voltage U1 , the first substrate temperature t1 , the second temperature signal voltage U2 and the second substrate temperature t2 .

[0091] Optionally, the linear relationship parameters include a temperature signal curve slope k and a temperature signal curve intercept b. The controller determines the linear relationship parameters corresponding to the temperature signal voltage U of the intelligent power module and the substrate temperature t according to the first temperature signal voltage U1, the first substrate temperature t1, the second temperature signal voltage U2, and the second substrate temperature t2, using the following formula:

[0092]

[0093]

[0094] In practice, the linear relationship between the temperature signal voltage U of the intelligent power module and the substrate temperature t can be expressed as U = k × t + b. Where k is the slope of the temperature signal curve, and b is the intercept of the temperature signal curve. Based on the first temperature signal voltage U1, the first substrate temperature t1, the second temperature signal voltage U2, and the second substrate temperature t2, the controller can derive: U1 = k × t1 + b, U2 = k × t2 + b, and derive:

[0095] k=(U1-U2)÷(t1-t2)=[(U1-U2)×C2×m]÷[(T2-T3)×C1×M1];

[0096] b=U1-k×t1=U1-k×T1=U1-[(U1-U2)×C2×m]÷[(T2-T3)×C1×M1]×T1.

[0097] For an intelligent power module produced by any manufacturer, the temperature signal voltage corresponding to the temperature of any heat sink can be determined according to the temperature control method provided in the embodiment of the present application. For example, a variable frequency range hood manufacturer purchases an intelligent power module for driving the variable frequency range hood, but the linear relationship between the substrate temperature of the intelligent power module and the temperature signal voltage output by the intelligent power module is unknown. If the over-temperature protection temperature of the intelligent power module is 110 degrees, and the temperature warning threshold set by the variable frequency range hood manufacturer is 100 degrees, the method provided in the embodiment of the present application can be used to determine that when t = 100 degrees, the temperature signal voltage U = U output by the intelligent power module. max , when the temperature signal voltage output by the intelligent power module obtained by the controller is U max When the over-temperature protection temperature is exceeded, the controller drives the intelligent power module to reduce the output power so that the substrate temperature does not exceed the over-temperature protection temperature.

[0098] Optional, Figure 4 A schematic diagram of a temperature signal curve provided in an embodiment of the present application is shown as follows: Figure 4 As shown, the horizontal axis is the substrate temperature, the vertical axis is the temperature signal voltage, the over-temperature protection temperature is 110 degrees, the corresponding temperature signal voltage is 3.3V, the temperature warning threshold is 100 degrees, and the corresponding temperature signal voltage is 3.0V. When the temperature signal voltage output by the intelligent power module obtained by the controller reaches 3.0V, it means that the substrate temperature reaches the temperature warning threshold. At this time, the controller drives the intelligent power module to reduce the output power to cool the intelligent power module.

[0099] As an optional embodiment, the heat-conducting medium in the closed insulation space includes one or more of air, coolant, thermal grease, phase change material and thermal double-sided tape.

[0100] An embodiment of the present application provides a temperature control method for an intelligent power module, which is applied to a variable-frequency range hood. The variable-frequency range hood includes an intelligent power module and an ambient temperature sensor. The ambient temperature sensor is disposed within a closed, insulated space within the intelligent power module and is configured to detect the temperature of a heat-conducting medium within the closed, insulated space. The method comprises: upon startup of the intelligent power module, obtaining a first temperature signal voltage U1 output by the intelligent power module, and detecting the first temperature T1 of the medium within the closed, insulated space via the ambient temperature sensor. After the intelligent power module has operated for a predetermined period of time, the intelligent power module is controlled to stop operating, a second temperature signal voltage U2 output by the intelligent power module is obtained, and the second temperature T2 of the medium within the closed, insulated space is detected via the ambient temperature sensor. After the intelligent power module stops operating, when the obtained temperature signal voltage U output by the intelligent power module is equal to the first temperature signal voltage U1, a third temperature T3 of the medium within the closed, insulated space is detected via the ambient temperature sensor. Based on the first temperature signal voltage U1, the first medium temperature T1, the second temperature signal voltage U2, the second medium temperature T2, and the third medium temperature T3, a linear relationship parameter corresponding to the temperature signal voltage U of the intelligent power module and the substrate temperature t is determined. This application establishes an ambient temperature sensor within the enclosed, adiabatic space housing the intelligent power module to collect the medium temperature of the heat-conducting medium. Based on the consistent thermal changes of the intelligent power module's substrate within the enclosed, adiabatic space, the linear relationship parameters between the intelligent power module's temperature signal voltage and the substrate temperature are determined, thereby deriving the corresponding substrate temperature for any temperature signal voltage. This temperature control method, based on this application, enables automatic temperature control adaptation for intelligent power modules from different manufacturers, eliminating the need to compile multiple control programs for different intelligent power modules, thus facilitating software management.

[0101] It should be understood that although Figures 2 to 3 The steps in the flowchart are shown in sequence as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified in this document, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders. In addition, Figures 2 to 3 At least part of the steps may include multiple steps or multiple stages. These steps or stages are not necessarily performed at the same time, but can be performed at different times. The order of execution of these steps or stages is not necessarily one by one, but can be performed in turn or alternately with other steps or at least part of the steps or stages in other steps.

[0102] It can be understood that the same / similar parts between the various embodiments of the above method in this specification can be referred to each other, and each embodiment focuses on the differences from other embodiments. For related parts, please refer to the description of other method embodiments.

[0103] The present application also provides a variable frequency range hood. Figure 1 As shown, the variable frequency range hood includes a controller 110, an intelligent power module 120 and an ambient temperature sensor 130; wherein,

[0104] The ambient temperature sensor 130 is used to collect the temperature of the heat-conducting medium in the closed thermal insulation space where the intelligent power module 120 is located;

[0105] The controller 110 is configured to control the startup of the intelligent power module 120 and obtain a first temperature signal voltage output by the intelligent power module 120 and a first medium temperature in the closed thermal insulation space when the intelligent power module 120 is started;

[0106] The controller 110 is further configured to control the intelligent power module 120 to stop working after the intelligent power module 120 has worked for a preset period of time, and obtain a second temperature signal voltage output by the intelligent power module 120 and a second medium temperature in the closed adiabatic space;

[0107] The controller 110 is further configured to, after the intelligent power module 120 stops working, when the temperature signal voltage output by the intelligent power module 120 is the first temperature signal voltage, determine the temperature of the third medium in the closed adiabatic space;

[0108] The controller 110 is further configured to determine a linear relationship parameter corresponding to the temperature signal voltage of the intelligent power module 120 and the substrate temperature based on the first temperature signal voltage, the first medium temperature, the second temperature signal voltage, the second medium temperature, and the third medium temperature.

[0109] As an optional implementation, the controller 110 is configured to determine the first medium temperature as the first substrate temperature corresponding to the first temperature signal voltage;

[0110] The controller 110 is further configured to determine, based on the third medium temperature, the second medium temperature, a preset heat transfer medium mass, and a preset heat transfer medium specific heat capacity, a first amount of heat absorbed by the heat transfer medium when the temperature signal voltage drops to the first temperature signal voltage after the intelligent power module 120 stops operating;

[0111] The controller 110 is further configured to determine the first heat absorbed by the heat-conducting medium as the second heat released by the intelligent power module 120;

[0112] The controller 110 is further configured to determine a second substrate temperature corresponding to the second temperature signal voltage based on a second amount of heat released by the intelligent power module 120, the first substrate temperature, a preset substrate mass, and a preset substrate specific heat capacity;

[0113] The controller 110 is further configured to determine a linear relationship parameter corresponding to the temperature signal voltage and substrate temperature of the intelligent power module 120 based on the first temperature signal voltage, the first substrate temperature, the second temperature signal voltage, and the second substrate temperature.

[0114] An embodiment of the present application provides a variable frequency range hood, which includes a controller 110, an intelligent power module 120, and an ambient temperature sensor 130. The ambient temperature sensor 130 is used to collect the medium temperature of the heat-conducting medium in the closed, heat-insulating space where the intelligent power module 120 is located. The controller 110 is used to control the startup of the intelligent power module 120 and obtain the first temperature signal voltage output by the intelligent power module 120 and the first medium temperature in the closed, heat-insulating space when the intelligent power module 120 is started. The controller 110 is also used to control the intelligent power module 120 to stop working after the intelligent power module 120 has been working for a preset period of time, and obtain the second temperature signal voltage output by the intelligent power module 120 and the second medium temperature in the closed, heat-insulating space. The controller 110 is also used to, after the intelligent power module 120 stops working, when the obtained temperature signal voltage output by the intelligent power module 120 is the first temperature signal voltage, to obtain the third medium temperature in the closed, heat-insulating space. The controller 110 is further configured to determine the linear relationship parameters corresponding to the temperature signal voltage of the intelligent power module 120 and the substrate temperature based on the first temperature signal voltage, the first medium temperature, the second temperature signal voltage, the second medium temperature, and the third medium temperature. The present application collects the medium temperature of the heat-conducting medium by disposing an ambient temperature sensor 130 within the closed, heat-insulating space where the intelligent power module 120 is located. The controller 110 determines the linear relationship parameters corresponding to the temperature signal voltage of the intelligent power module 120 and the substrate temperature based on the characteristic that the heat changes of the substrate of the intelligent power module 120 within the closed, heat-insulating space are consistent with the heat changes of the heat-conducting medium, thereby deriving the substrate temperature corresponding to any temperature signal voltage. The temperature control method of the present application can achieve automatic adaptation of temperature control to intelligent power modules from different manufacturers, eliminating the need to compile multiple control programs for different intelligent power modules, which facilitates software management.

[0115] The specific limitations of the variable-frequency range hood can be found in the aforementioned limitations on the temperature control method for the intelligent power module and will not be further elaborated here. Each module in the variable-frequency range hood can be implemented in whole or in part through software, hardware, or a combination thereof. Each of these modules can be embedded in or independent of a processor in a computer device in hardware form, or stored in a computer device memory in software form, allowing the processor to call and execute the corresponding operations of each module.

[0116] Those skilled in the art will understand that all or part of the processes in the above-mentioned embodiment methods can be implemented by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application may include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in many forms such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus direct RAM (RDRAM), direct RAM bus dynamic RAM (DRDRAM), and RAM bus dynamic RAM (RDRAM).

[0117] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0118] It should also be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for display, data for analysis, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties.

[0119] Each embodiment in this specification is described in a related manner. Similar parts between the various embodiments can be referred to in conjunction with each other. Each embodiment focuses on the differences between the other embodiments. In particular, the system embodiment is generally similar to the method embodiment, so the description is relatively simple. For related parts, refer to the description of the method embodiment.

[0120] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0121] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art could make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A temperature control method for an intelligent power module, characterized in that: The method is applied to a variable frequency range hood, which includes an intelligent power module and an ambient temperature sensor. The ambient temperature sensor is disposed in a closed, heat-insulating space where the intelligent power module is located and is used to collect a medium temperature T of a heat-conducting medium in the closed, heat-insulating space. The method includes: When the intelligent power module is started, a first temperature signal voltage U1 output by the intelligent power module is obtained, and a first medium temperature T1 in the closed insulation space is collected through the ambient temperature sensor; After the intelligent power module has been operating for a preset time, the intelligent power module is controlled to stop operating, a second temperature signal voltage U2 output by the intelligent power module is obtained, and a second medium temperature T2 in the closed adiabatic space is collected through the ambient temperature sensor; After the intelligent power module stops working, when the acquired temperature signal voltage U output by the intelligent power module is equal to the first temperature signal voltage U1, collecting the third medium temperature T3 in the closed insulation space through the ambient temperature sensor; Determine a linear relationship parameter corresponding to the temperature signal voltage U of the intelligent power module and the substrate temperature t according to the first temperature signal voltage U1, the first medium temperature T1, the second temperature signal voltage U2, the second medium temperature T2, and the third medium temperature T3; Determining a linear relationship parameter corresponding to the temperature signal voltage U of the intelligent power module and the substrate temperature t according to the first temperature signal voltage U1, the first medium temperature T1, the second temperature signal voltage U2, the second medium temperature T2, and the third medium temperature T3 includes: Determine the first medium temperature T1 as the first substrate temperature t1 corresponding to the first temperature signal voltage U1; determining, based on the third medium temperature T3, the second medium temperature T2, a preset heat conducting medium mass M, and a preset heat conducting medium specific heat capacity C1, a first heat quantity Q1 absorbed by the heat conducting medium when the temperature signal voltage U drops to the first temperature signal voltage U1 after the intelligent power module stops operating; Determining the first heat Q1 absorbed by the heat-conducting medium as the second heat Q2 released by the intelligent power module; Determining a second substrate temperature t2 corresponding to the second temperature signal voltage U2 according to a second heat Q2 released by the intelligent power module, the first substrate temperature t1, a preset substrate mass m, and a preset substrate specific heat capacity C2; A linear relationship parameter corresponding to the temperature signal voltage U and the substrate temperature t of the intelligent power module is determined according to the first temperature signal voltage U1 , the first substrate temperature t1 , the second temperature signal voltage U2 , and the second substrate temperature t2 .

2. The method according to claim 1, characterized in that The determining, based on the third medium temperature T3, the second medium temperature T2, a preset heat-conducting medium mass M, and a preset heat-conducting medium specific heat capacity C1, of a first heat quantity Q1 absorbed by the heat-conducting medium when the temperature signal voltage U drops to the first temperature signal voltage U1 after the intelligent power module stops operating, includes: Q1=C1×M×(T3-T2).

3. The method according to claim 1, characterized in that The determining, based on the second heat Q2 released by the intelligent power module, the first substrate temperature t1, a preset substrate mass m, and a preset substrate specific heat capacity C2, of the second substrate temperature t2 corresponding to the second temperature signal voltage U2 includes: t2=Q2÷C2÷m+t1.

4. The method according to claim 1, wherein The linear relationship parameters include a temperature signal curve slope k and a temperature signal curve intercept b. Determining the linear relationship parameters corresponding to the temperature signal voltage U and the substrate temperature t of the intelligent power module based on the first temperature signal voltage U1, the first substrate temperature t1, the second temperature signal voltage U2, and the second substrate temperature t2 includes:

5. The method according to claim 1, wherein The heat-conducting medium in the closed heat-insulating space includes one or more of air, coolant, thermal grease, phase change material and thermal double-sided tape.

6. A variable frequency range hood, characterized in that: The variable frequency range hood includes a controller, an intelligent power module and an ambient temperature sensor; wherein, The ambient temperature sensor is used to collect the medium temperature T of the heat-conducting medium in the closed and adiabatic space where the intelligent power module is located; The controller is configured to control the startup of the intelligent power module and obtain a first temperature signal voltage U1 output by the intelligent power module and a first medium temperature T1 in the closed thermal insulation space when the intelligent power module is started; The controller is further configured to control the intelligent power module to stop working after the intelligent power module has worked for a preset period of time, and obtain a second temperature signal voltage U2 output by the intelligent power module and a second medium temperature T2 in the closed adiabatic space; The controller is further configured to, after the intelligent power module stops working, when the acquired temperature signal voltage U output by the intelligent power module is the first temperature signal voltage U1, determine the temperature T3 of the third medium in the closed adiabatic space; The controller is further configured to determine a linear relationship parameter corresponding to the temperature signal voltage U of the intelligent power module and the substrate temperature t based on the first temperature signal voltage U1, the first medium temperature T1, the second temperature signal voltage U2, the second medium temperature T2, and the third medium temperature T3; the controller is further configured to determine the first medium temperature T1 as the first substrate temperature t1 corresponding to the first temperature signal voltage U1; The controller is further configured to determine, based on the third medium temperature T3, the second medium temperature T2, a preset heat-conducting medium mass M, and a preset heat-conducting medium specific heat capacity C1, a first heat quantity Q1 absorbed by the heat-conducting medium when the temperature signal voltage U drops to the first temperature signal voltage U1 after the intelligent power module stops operating; The controller is further configured to determine the first heat Q1 absorbed by the heat-conducting medium as the second heat Q2 released by the intelligent power module; The controller is further configured to determine a second substrate temperature t2 corresponding to the second temperature signal voltage U2 based on a second heat Q2 released by the intelligent power module, the first substrate temperature t1, a preset substrate mass m, and a preset substrate specific heat capacity C2; The controller is further configured to determine a linear relationship parameter corresponding to the temperature signal voltage U and the substrate temperature t of the intelligent power module based on the first temperature signal voltage U1, the first substrate temperature t1, the second temperature signal voltage U2, and the second substrate temperature t2.

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