CN118244075A - On-line accurate acquisition method and system for junction temperature of power module of converter - Google Patents
On-line accurate acquisition method and system for junction temperature of power module of converter Download PDFInfo
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Abstract
The invention discloses a method and a system for accurately acquiring junction temperature of a power module of a converter on line, wherein the method comprises the following steps: performing off-line junction temperature calibration experiments on the power module for calibration to obtain junction temperature-current-conduction voltage drop data of the power module for calibration, and performing curve fitting to obtain a calibration curve; when the power module to be tested is electrified for the first time, the junction temperature, the conduction current and the conduction voltage drop of the power module to be tested are measured, and the calibration curve is corrected in a mode of translating the calibration curve, so that a corrected calibration curve of the power module to be tested is obtained; and synchronously measuring the conduction current and the conduction voltage drop of the power module to be measured in the operation process, and substituting the conduction current and the conduction voltage drop into a calibration curve corrected by the power module to be measured to obtain the junction temperature corrected by the power module to be measured. The method solves the problems that junction temperature calibration cannot be carried out on a large number of power modules, and the on-line extraction of the junction temperature caused by the difference of the power modules has errors and influences on the reliability of the power modules.
Description
Technical Field
The invention relates to the technical field of semiconductor testing, in particular to a method and a system for accurately acquiring junction temperature of a power module of a converter on line.
Background
Junction temperature is an important parameter for representing the working state and the health state of a semiconductor device, and the junction temperature of a power module can be extracted by a direct measurement method, a thermal network model method, a thermosensitive electrical parameter method and the like. The thermosensitive electrical parameter method is a junction temperature extraction method with great competitive force, and has the advantages of good linearity, high sensitivity, non-invasive online extraction and the like. In the process of extracting the junction temperature of the power module by a thermosensitive electrical parameter method, a researcher is usually required to calibrate the relationship between the thermosensitive electrical parameter and the junction temperature of each device in advance, and the workload of the process is extremely high; if only one or more devices of the same model are subjected to junction temperature calibration experiments in order to reduce the calibration workload of the devices in batches, the calibration sample size is small, and the junction temperature measurement is inaccurate.
The reason for inaccurate junction temperature measurement is device variability. There is more or less difference between the devices, and there is necessarily a certain difference between the junction temperature and the thermosensitive electrical parameter of the power module used in the calibration experiment and the relationship curve between the junction temperature and the thermosensitive electrical parameter of the actually used power module, which can cause errors in extracting the junction temperature of other devices used in the system by using the calibration curve obtained by one or more devices, thereby affecting the reliable operation of the power module and the accuracy of the health state and service life assessment of the power module.
In the prior art, the influence of device variability on junction temperature extraction is considered to be still fresh, but the current method mainly focuses on verifying that the conclusion obtained by calibration is applied to relatively more devices, such as literature A non-invasive method to extract the junction temperature of IGBT and literature "A Statistical Study on the Required Sample Number of SiC SBD to Secure Estimated Junction Temperature with K Factor",, but the sample size is still smaller, and no correction work is performed on the device variability, so that junction temperature extraction errors still exist and are larger; the document Virtual Temperature Detection of Semiconductors IN A MEGAWATT FIELD Converter establishes a lookup table through data in the operation process to carry out online correction, but the lookup table established by the method is discrete, and needs to carry out real-time measurement for a long operation time in order to be in line with each potential operation condition of the Converter as far as possible, so that a data set is huge and calculation load is high, if the method uses data with short time to approximately represent the data with uncovered time, but approximation errors are generated, and junction temperature extraction errors are larger; in addition, the method corrects the junction temperature extraction of the power module of the thermosensitive electrical parameter method by adding or modifying the relevant control mode, such as document "Measurement and datalogging platform for junction temperature estimation and converter diagnostics",, but for on-line monitoring, the method of adding or modifying the relevant control mode is difficult to realize, on one hand, the adding or modifying control mode needs to carry out deep design and analysis on the system, and the modes of algorithm, sensor arrangement, data acquisition and processing and the like are considered, and experimental verification is needed; on the other hand, adding or modifying control schemes may require compatibility with existing equipment and systems, and cost evaluation, which is a significant effort for a well-established system. Therefore, a method for effectively improving the junction temperature extraction accuracy of uncalibrated power modules is needed.
Disclosure of Invention
First, the technical problem to be solved
Based on the problems, the invention provides a method and a system for accurately acquiring junction temperature of a power module of a converter on line, which solve the problems that the junction temperature of a large number of power modules cannot be calibrated, the junction temperature on line extraction caused by the difference of the power modules has errors, and the reliability of the power modules is affected.
(II) technical scheme
Based on the technical problems, the invention provides a method for accurately acquiring the junction temperature of a power module of a converter on line, which comprises the following steps:
Step S1, performing off-line junction temperature calibration experiments on a power module for calibration to obtain junction temperature-current-thermosensitive electrical parameter data of the power module for calibration, wherein the thermosensitive electrical parameter is a thermosensitive electrical parameter which can be measured when the converter is started and has a linear relation with the junction temperature;
S2, curve fitting is carried out on junction temperature-current-thermosensitive electrical parameter data of the power module for calibration, which is obtained through calibration, so as to obtain a calibration curve;
Step S3, when the power module to be tested is electrified for the first time, junction temperature, conduction current and thermosensitive electrical parameters of the power module to be tested are measured;
S4, correcting the calibration curve in a mode of translating the calibration curve according to the junction temperature, the conduction current and the thermosensitive electrical parameters of the power module to be measured, and as the curve change trend between the junction temperature and the thermosensitive electrical parameters of the power module with the same model is the same, obtaining the corrected calibration curve of the power module to be measured;
And S5, synchronously measuring the conduction current and the thermosensitive electrical parameter of the power module to be measured in the operation process, and performing junction temperature back-pushing by using the calibration curve corrected by the power module to be measured to obtain the junction temperature corrected by the power module to be measured.
Further, the thermosensitive electrical parameter is a conduction voltage drop.
Further, the step S1 includes:
S11, connecting the power module into a converter circuit, and recording a conduction voltage drop V on0 when a conduction current I on reaches a given measurement current for the first time and a corresponding junction temperature detection temperature T h0 when the converter is started;
S12, enabling the converter to reach a thermal stable state, and recording a corresponding conduction voltage drop V on1 and a corresponding junction temperature detection temperature T h1 under a given measurement current again;
S13, using a temperature control device to make the junction temperature of the power module re-stabilize at another junction temperature, and measuring to obtain a corresponding conduction voltage drop V on2 and a detection temperature T h2 of the junction temperature under another thermal stabilization state of the same conduction current I on;
S14, replacing the conduction current I on, and repeating the steps S11-S13 to obtain the conduction voltage drop and the junction temperature detection temperature under three states of different conduction currents.
Further, in step S2, the fitting formula of the calibration curve is: t j＝aVon(Ion)+b,Ion is conduction current, V on is conduction voltage drop, T j is junction temperature T j of the power module, and a and b are fitting parameters.
Further, in the step S4, a fitting formula of the corrected calibration curve is:
Tj＝aVon(Ion)+(b1+aΔVon)，
ΔVon＝Von5-Von4，
Wherein V on5 is the conduction voltage drop of the calibration power module at junction temperature T j4 and conduction current I on4, T j4、Ion4、Von4 is the junction temperature, conduction current and conduction voltage drop measured when the power module to be tested is powered on for the first time, and b 1 is the fitting parameter.
Further, after the step S2, the method further includes: and evaluating the fitting result through SSE, R-Square, adjusted R-Square or RMSE performance indexes, and if the fitting effect is not good, adjusting the number of times of variables in the formula to optimize the fitting effect.
Further, the junction temperature is detected as the temperature of the radiator when the converter reaches a thermally stable state.
Further, in step S3, the junction temperature of the power module to be tested when the power module is powered on for the first time is ambient temperature.
Further, the converter is arranged in a temperature control device with temperature control and monitoring, and a detection device for detecting the current and the voltage of the converter circuit is arranged.
The invention also discloses an online accurate acquisition system for the junction temperature of the power module of the converter, and an online accurate acquisition method for the junction temperature of the power module of the converter is operated.
(III) beneficial effects
The technical scheme of the invention has the following advantages:
(1) According to the invention, a calibration curve is obtained through preliminary fitting of data of an offline junction temperature calibration experiment, the calibration curve is corrected to a certain extent by utilizing data of primary power-on of the power module to be measured, so that a corrected calibration curve for the power module to be measured is obtained, in the running process, the on-current and the voltage drop of the power module are synchronously measured, the corrected junction temperature of the power module to be measured is obtained by back-pushing, and state monitoring and junction temperature regulation are carried out according to the corrected junction temperature, so that the problem of inaccurate temperature measurement caused by device difference between a calibration device and the device to be measured can be effectively avoided, and the accuracy and the robustness of junction temperature extraction of the power module not to be calibrated are effectively improved;
(2) According to the invention, junction temperature calibration is not required to be carried out on a large number of power modules, so that the calibration sample size and the calibration workload are greatly reduced;
(3) The correction method of the invention takes the conduction voltage drop as the thermosensitive electrical parameter, can also use other thermosensitive electrical parameters which are measurable when the power electronic converter is started and have linear relation with the junction temperature to correct the device difference, and has wider application range.
Drawings
The features and advantages of the present invention will be more clearly understood by reference to the accompanying drawings, which are illustrative and should not be construed as limiting the invention in any way, in which:
Fig. 1 is a flowchart of a method for accurately obtaining junction temperature of a power module of a converter in an online manner according to an embodiment of the invention;
FIG. 2 is a schematic diagram of an off-line junction temperature calibration experiment according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating a structure and a heat transfer path of a power module according to an embodiment of the invention;
FIG. 4 is a circuit diagram illustrating an on-line measurement correction in accordance with the present invention;
FIG. 5 is a schematic view of a fitted curve for junction temperature correction according to the present invention.
Detailed Description
The following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
The embodiment of the invention relates to a method for accurately acquiring the junction temperature of a power module of a converter on line, which comprises the steps of junction temperature calibration, curve fitting, measurement of conduction voltage drop and ambient temperature during primary power-on in the practical application process, calibration curve correction and accurate extraction of the junction temperature, wherein as shown in fig. 1, the conduction voltage drop is taken as a thermosensitive electrical parameter for example, and the specific steps are as follows:
step S1, performing off-line junction temperature calibration experiments on a power module to be calibrated to obtain junction temperature-current-conduction voltage drop data;
An off-line junction temperature calibration experiment is carried out on a power module of one model, as shown in fig. 2, the power module to be calibrated is connected into a temperature control device converter, the temperature of the converter is controlled, and the conduction voltage drop of the power module to be calibrated is synchronously measured under different currents, so that junction temperature-current-conduction voltage drop data are obtained. It is worth to say that the junction temperature calibration experiment belongs to the known content, and aiming at the problem of controlling the temperature of the converter, the junction temperature control can be performed by using a thermostat, a water-cooled radiator or a heating plate and the like, and the converter is placed for a long time at the calibration temperature as much as possible during the control, so that the junction temperature of the power module is stabilized at the calibration temperature, and the environment temperature of the converter is relatively uniform as much as possible; under the condition that the junction temperature is stable, measuring the temperature of the radiator as the junction temperature; for current control of the power module, a controllable current source can be used for control; for the conduction voltage drop measurement of the power module, voltage measurement can be performed by connecting an oscilloscope, constructing a sampling circuit and the like, and specific calibration steps are as follows:
S10, connecting a power module to be calibrated into a converter circuit, placing the converter in a temperature control device with temperature control and monitoring, and arranging a detection device for detecting the current and the voltage of the converter circuit;
S11, when the converter is started, recording a conduction voltage drop V on0 when the conduction current I on reaches a given measurement current for the first time and a corresponding junction temperature detection temperature T h0;
S12, enabling the converter to reach a thermal stable state; then, recording the corresponding conduction voltage drop V on1 and the detection temperature T h1 of the junction temperature under the given sensing current again; the duration of this phase depends on the thermal response and the specific installation of the applied power module, possibly lasting up to several minutes; determining a thermally stable state when T h1 does not increase and the change remains within a certain range;
S13, using the temperature control device to enable the junction temperature of the power module to be re-stabilized at the other junction temperature, and measuring to obtain a corresponding conduction voltage drop V on2 and a detection temperature T h2 of the junction temperature under the other thermal steady state of the same conduction current I on;
S14, replacing the conduction current I on, and repeating the steps S11-S13 to obtain the conduction voltage drop and the junction temperature detection temperature under the three conditions under different conduction currents; in this embodiment, when the converter reaches a thermally stable state, the temperature of the radiator approaches the junction temperature, and the temperature of the radiator is used as the temperature for detecting the junction temperature.
Step S2, curve fitting is carried out on the junction temperature-current-conduction voltage drop data obtained through calibration, a calibration curve is obtained, and a fitting formula of the calibration curve is as follows:
Tj＝aVon(Ion)+b (1)
in order to estimate the junction temperature T j of the power module through the above formula, the values of a and b in the formula need to be focused on.
Fig. 3 is a block diagram of a power module, according to the heat dissipation path in the diagram, the junction temperature of the power module is a function of the power loss, the thermal resistance and the reference temperature (e.g. the temperature of the heat sink) in a thermally stable state, assuming that m power chips are in a module, the junction temperature of the first chip is calculated as:
Wherein R jh,11 is the crusting heat resistance of the first chip, R jh,21-Rjh,m1 is the coupling heat resistance of the first chip and other chips in the module, and P loss,1-Ploss,m is the average power loss generated by the 1 st to m th chips in a basic period.
For a converter under calibration, parameters a and b in the above equation may remain constant at these two temperature levels if its on-current I rms is fixed and the radiator temperature T h increases from T h1 to T h2. Further, it is assumed that the thermal resistance R jh is constant at a given degradation level. Then, (1) and (2) can be rewritten at these two temperature levels as:
Subtracting the second formula from the first formula in formulas (3) and (4) can obtain:
Tj(Th2)-Tj(Th1)＝aVon1(Ion,Th2)-aVon2(Ion,Th1) (5)
Dividing formulae (5), (6) by DeltaV on(Ion) (i.e., V on2(Ion,Th2)-Von2(Ion,Th1))
Wherein,ΔTj＝Tj(Th2)-Tj(Th1),ΔTh＝Th2-Th1；
If I on is unchanged, T h is increased by Δt h, the increase in power loss Δp loss is due only to the change in T h, and T h may be a relatively low value. In addition, the thermal resistance R jh is typically less than 1, and therefore,Much smaller than deltat h in formula (7).
Thus, when V on is located at a given I on, and T h is measured at two radiator temperature levels, then it can be calculated by:
after a is obtained, b can be calculated by substituting T h0 and V on0 into (1). At the start of the converter, it can be assumed that the junction temperature T j of the power module is equal to T h0 at this time, since the differences between them are negligible, which can be explained by the following analysis:
When the converter is not turned on for a long time, the junction temperature of the module, the temperature of the radiator and the ambient temperature are equal. Based on the Foster thermal network model, when starting transient state, the thermal resistance in the above formula is replaced by transient state thermal resistance, and the junction temperature of corresponding loss is:
Where τ 11 is the self-heating time constant of the i-th order chip to be tested, and τ 21-τm1 is the coupling time constant of the tested chip and the i-th order other chips.
During converter start-up, the run time t is a relatively small value, which means that the above left term is small, and the difference between junction temperature and radiator temperature is negligible. The self-heating generated by the current flowing through the module is small, the junction temperature of the power module does not generate temperature rise due to the large current, and the junction temperature can be regarded as the ambient temperature.
Therefore, b can be calculated by substituting the pair of T h0 and V on0 measured at the initial stage of the inverter start-up into equation (1). It should be noted that V on0 is measured early during start-up to limit errors. It should be noted that since the first term to the right of equation (6) is ignored, neither the first nor the n-order thermal network affects the accuracy of the method.
The result of the fitting can be evaluated by using SSE, R-Square, adjusted R-Square, RMSE and other performance indicators. If the fitting effect is not good, the number of times of the variables in the formula can be properly adjusted to optimize the fitting effect.
Step S3, when the power module to be tested is powered on for the first time, the junction temperature, the on current and the on voltage drop of the power module to be tested are measured and are respectively T j4、Ion4、Von4, as shown in fig. 4.
It is worth to say that, the on-state current of the power module to be measured can be measured by adding a current sensor, adding a current sampling circuit and the like; the ambient temperature may be measured by adding a temperature sensor, thermometer, etc. around the ambient. The engineering professional can select various modes to measure the parameters according to actual conditions.
S4, correcting the calibration curve in a mode of translating a fitting curve according to the junction temperature, the conduction current and the conduction voltage drop of the power module to be tested, and obtaining a corrected calibration curve of the power module to be tested, wherein the curve change trend between the junction temperature and the conduction voltage drop of the power module with the same model is the same;
And correcting a fitting curve of the power module for calibration aiming at the conduction current and the voltage drop of the power module to be tested when the power module is electrified for the first time. If the junction temperature, on-current and voltage drop data of the power module at the time of the initial power-up are (T j4,Ion4,Von4). The curve change trend between the junction temperature and the conduction voltage drop of the power modules with the same model can be assumed to be the same, and the correlation correction is carried out by a mode of translating the calibration curve.
The calibration curve of the power module for calibration is T j＝aVon(Ion)+b1, the conduction voltage drop data of the curve under the corresponding junction temperature T j4 and the corresponding conduction current I on4 is V on5, and at the moment, the power module for calibration comprises:
Subtracting the above formula from the following formula in formula (10) gives b 2 as:
b2＝b1+aVon5(Ion4)-aVon4(Ion4) (11)
at this time, the calibration curve is corrected as follows:
Tj＝aVon(Ion)+(b1+aΔVon) (12)
wherein, deltaV on＝Von5-Von4, the calibration curve after correction is shown in FIG. 5.
It is worth to say that the correction method provided by the invention is only an example, and the core idea is that the calibration fitting formula can be corrected to a certain extent according to the on-current, the voltage drop and the ambient temperature when the power module to be tested is powered on for the first time.
Step S5, synchronously measuring the conduction current and the conduction voltage drop of the power module to be tested in the operation process, and performing junction temperature back-pushing by using the calibration curve corrected by the power module to be tested to obtain the junction temperature corrected by the power module to be tested;
the method mainly comprises two parts of primary power-on correction and accurate junction temperature measurement, and specifically comprises the following steps:
And (5) primary power-on correction: measuring junction temperature (ambient temperature), conduction voltage drop and conduction current of a power module to be tested when the converter is electrified for the first time; then, correcting the calibration curve to a certain extent by utilizing the data of the primary power-on; therefore, a junction temperature-conduction voltage drop-current curve different from that of the calibration power module is obtained for the power module to be tested.
And (3) junction temperature accurate measurement: in the running process, synchronously measuring the conduction current and the voltage drop of the power module; substituting the voltage-current curve into a junction temperature-conduction voltage drop-current curve obtained by power-on correction for reverse thrust; the corrected junction temperature of the power module to be measured is obtained, and state monitoring and junction temperature regulation are performed, so that the problem of inaccurate temperature measurement caused by device difference between a calibration device and the device to be measured is avoided.
In the embodiment of the invention, the conduction voltage drop is taken as an example of a thermosensitive electrical parameter, and it is to be noted that other thermosensitive electrical parameters which can be measured when the power electronic converter is started and have a linear relation with the junction temperature can also be corrected by the method of the invention by taking the device difference into account.
In summary, the online accurate acquisition method and system for the junction temperature of the power module of the converter have the following beneficial effects:
(1) According to the invention, a calibration curve is obtained through preliminary fitting of data of an offline junction temperature calibration experiment, the calibration curve is corrected to a certain extent by utilizing data of primary power-on of the power module to be measured, so that a corrected calibration curve for the power module to be measured is obtained, in the running process, the on-current and the voltage drop of the power module are synchronously measured, the corrected junction temperature of the power module to be measured is obtained by back-pushing, and state monitoring and junction temperature regulation are carried out according to the corrected junction temperature, so that the problem of inaccurate temperature measurement caused by device difference between a calibration device and the device to be measured can be effectively avoided, and the accuracy and the robustness of junction temperature extraction of the power module not to be calibrated are effectively improved;
(2) According to the invention, junction temperature calibration is not required to be carried out on a large number of power modules, so that the calibration sample size and the calibration workload are greatly reduced;
(3) The correction method of the invention takes the conduction voltage drop as the thermosensitive electrical parameter, can also use other thermosensitive electrical parameters which are measurable when the power electronic converter is started and have linear relation with the junction temperature to correct the device difference, and has wider application range.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although embodiments of the present invention have been described in connection with the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope of the invention as defined by the appended claims.
Claims (10)
1. The method for accurately acquiring the junction temperature of the power module of the converter on line is characterized by comprising the following steps of:
Step S1, performing off-line junction temperature calibration experiments on a power module for calibration to obtain junction temperature-current-thermosensitive electrical parameter data of the power module for calibration, wherein the thermosensitive electrical parameter is a thermosensitive electrical parameter which can be measured when the converter is started and has a linear relation with the junction temperature;
S2, curve fitting is carried out on junction temperature-current-thermosensitive electrical parameter data of the power module for calibration, which is obtained through calibration, so as to obtain a calibration curve;
Step S3, when the power module to be tested is electrified for the first time, junction temperature, conduction current and thermosensitive electrical parameters of the power module to be tested are measured;
S4, correcting the calibration curve in a mode of translating the calibration curve according to the junction temperature, the conduction current and the thermosensitive electrical parameters of the power module to be measured, and as the curve change trend between the junction temperature and the thermosensitive electrical parameters of the power module with the same model is the same, obtaining the corrected calibration curve of the power module to be measured;
And S5, synchronously measuring the conduction current and the thermosensitive electrical parameter of the power module to be measured in the operation process, and performing junction temperature back-pushing by using the calibration curve corrected by the power module to be measured to obtain the junction temperature corrected by the power module to be measured.
2. The method for accurately obtaining the junction temperature of the power module of the converter on line according to claim 1, wherein the thermosensitive electrical parameter is a conduction voltage drop.
3. The method for accurately obtaining the junction temperature of the power module of the converter on line according to claim 2, wherein the step S1 includes:
S11, connecting the power module into a converter circuit, and recording a conduction voltage drop V on0 when a conduction current I on reaches a given measurement current for the first time and a corresponding junction temperature detection temperature T h0 when the converter is started;
S12, enabling the converter to reach a thermal stable state, and recording a corresponding conduction voltage drop V on1 and a corresponding junction temperature detection temperature T h1 under a given measurement current again;
S13, using a temperature control device to make the junction temperature of the power module re-stabilize at another junction temperature, and measuring to obtain a corresponding conduction voltage drop V on2 and a detection temperature T h2 of the junction temperature under another thermal stabilization state of the same conduction current I on;
S14, replacing the conduction current I on, and repeating the steps S11-S13 to obtain the conduction voltage drop and the junction temperature detection temperature under three states of different conduction currents.
4. The method for accurately obtaining the junction temperature of the power module of the converter on line according to claim 3, wherein in the step S2, a fitting formula of the calibration curve is:
Tj＝aVon(Ion)+b (1)
When V on is at a given I on and T h is measured at two temperature levels, then
A. b is a fitting parameter, after a is obtained, T h0 and V on0 are substituted into (1), b can be calculated, I on is conduction current, V on is conduction voltage drop, and T j is junction temperature of the power module.
5. The method for accurately obtaining the junction temperature of the power module of the converter on line according to claim 4, wherein in the step S4, a fitting formula of the corrected calibration curve is:
Tj＝aVon(Ion)+(b1+aΔVon)，
ΔVon＝Von5-Von4，
Wherein V on5 is the conduction voltage drop of the calibration power module at junction temperature T j4 and conduction current I on4, T j4、Ion4、Von4 is the junction temperature, conduction current and conduction voltage drop measured when the power module to be tested is powered on for the first time, and b 1 is the fitting parameter.
6. The method for accurately obtaining the junction temperature of the power module of the converter on line according to claim 1, wherein after the step S2, further comprises: and evaluating the fitting result through SSE, R-Square, adjusted R-Square or RMSE performance indexes, and if the fitting effect is not good, adjusting the number of times of variables in the formula to optimize the fitting effect.
7. The method for accurately obtaining the junction temperature of the power module of the converter on line according to claim 3, wherein the junction temperature is a radiator temperature at which the converter reaches a thermal stable state.
8. The method for accurately obtaining the junction temperature of the power module of the converter on line according to claim 1, wherein in step S3, the junction temperature of the power module to be tested when the power module is powered on for the first time is an ambient temperature.
9. The method for accurately obtaining the junction temperature of the power module of the converter on line according to claim 3, wherein the converter is arranged in a temperature control device with temperature control and monitoring, and a detection device for detecting the current and the voltage of the converter circuit is arranged.
10. An online accurate acquisition system for junction temperature of a power module of a converter, characterized in that the online accurate acquisition method for junction temperature of the power module of the converter according to claims 1-8 is operated.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410246906.5A CN118244075A (en) | 2024-03-05 | 2024-03-05 | On-line accurate acquisition method and system for junction temperature of power module of converter |
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