CN112580203A - Method and device for predicting temperature rise of electrolytic capacitor of frequency converter and storage medium - Google Patents
Method and device for predicting temperature rise of electrolytic capacitor of frequency converter and storage medium Download PDFInfo
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Abstract
The embodiment of the invention relates to the field of microelectronics, and discloses a method and a device for predicting temperature rise of an electrolytic capacitor of a frequency converter and a storage medium. The method for predicting the temperature rise of the electrolytic capacitor of the frequency converter comprises the following steps: acquiring ripple current of an electrolytic capacitor under a preset frequency according to the circuit structure and circuit parameters of the frequency converter; according to a preset assumed temperature of an electrolytic capacitor core package, acquiring an electrolytic capacitor ESR series connection simulation resistor under the assumed temperature and the preset frequency; acquiring the power loss of an electrolytic capacitor according to the ripple current and the ESR; and obtaining the predicted temperature of the electrolytic capacitor core package according to the power loss of the electrolytic capacitor and a pre-established electrolytic capacitor simulation model. The method is applied to the design and model selection process of electrolytic capacitor products, and the accuracy of frequency converter temperature prediction is improved.
Description
Technical Field
The invention relates to the technical field of microelectronics, in particular to a method and a device for predicting temperature rise of an electrolytic capacitor of a frequency converter and a storage medium.
Background
The frequency converter is a power control device which controls an alternating current motor by applying a frequency conversion technology and a microelectronic technology and changing the frequency mode of a working power supply of the motor, and mainly comprises a rectifying unit, a filtering unit, an inverting unit, a braking unit, a driving unit, a detecting unit, a microprocessing unit and the like. The electrolytic capacitor is used as a core component in the filter unit, the service life of the electrolytic capacitor can be seriously influenced by the high temperature of the electrolytic capacitor, and the electronic element can be possibly failed, so that the whole machine is failed, and even fails. In the design and model selection process of electrolytic capacitor products, the temperature rise process of the electrolytic capacitor needs to be accurately predicted, and most of manufacturers at home and abroad predict the temperature rise of the electrolytic capacitor by testing the surface temperature of the electrolytic capacitor and then calculating to obtain the internal temperature rise. However, this method is cumbersome, not intuitive and subject to certain errors.
Disclosure of Invention
The invention aims to provide a method and a device for predicting the temperature rise of an electrolytic capacitor of a frequency converter and a storage medium, which can directly predict the temperature rise of a core package of the electrolytic capacitor in a set working environment and have high accuracy.
In order to solve the above technical problem, an embodiment of the present invention provides a method for predicting temperature rise of an electrolytic capacitor of a frequency converter, including: acquiring ripple current of an electrolytic capacitor under a preset frequency according to the circuit structure and circuit parameters of the frequency converter; according to a preset assumed temperature of an electrolytic capacitor core package, acquiring an electrolytic capacitor ESR series connection simulation resistor under the assumed temperature and the preset frequency; acquiring the power loss of an electrolytic capacitor according to the ripple current and the ESR; and obtaining the predicted temperature of the electrolytic capacitor core package according to the power loss of the electrolytic capacitor and a pre-established electrolytic capacitor simulation model.
The embodiment of the invention also provides a temperature rise prediction device for the electrolytic capacitor of the frequency converter, which is characterized by comprising the following components:
the parameter acquisition module is used for acquiring ripple current of the electrolytic capacitor under the preset frequency according to the circuit structure and the circuit parameters of the frequency converter; according to a preset assumed temperature of an electrolytic capacitor core package, acquiring an electrolytic capacitor ESR series connection simulation resistor under the assumed temperature and the preset frequency; acquiring the power loss of an electrolytic capacitor according to the ripple current and the ESR;
and the temperature prediction module is used for obtaining the predicted temperature of the electrolytic capacitor core package according to the power loss of the electrolytic capacitor and a pre-established electrolytic capacitor simulation model.
Compared with the prior art, the method and the device have the advantages that the core cladding temperature of the electrolytic capacitor in the set working environment can be obtained in a simulation mode according to the pre-established electrolytic capacitor simulation model by obtaining the ripple current, the series simulation resistor and the power loss of the electrolytic capacitor, the accuracy is high, the operation is simple and convenient, and the method and the device are beneficial to large-scale application.
In addition, the method for predicting temperature rise of electrolytic capacitor of frequency converter according to the embodiment of the present invention, obtaining ripple current of electrolytic capacitor at preset frequency according to circuit structure and circuit parameters of frequency converter, includes: establishing a frequency converter circuit simulation model according to the frequency converter circuit structure and the circuit parameters; and acquiring the ripple current of the electrolytic capacitor under the preset frequency through simulation according to the frequency converter circuit simulation model. The ripple current of the electrolytic capacitor is obtained through simulation, the ripple current value can be quickly obtained, and complex operation and environmental limitation when data are obtained through actual measurement are avoided.
In addition, the method for predicting temperature rise of electrolytic capacitor of frequency converter according to the embodiment of the present invention, where the obtaining of the ESR series simulation resistance of the electrolytic capacitor at the assumed temperature and the preset frequency according to the assumed temperature of the core package, includes: performing polynomial fitting on the ESR data of the electrolytic capacitor at different temperatures and different frequencies, which are obtained in advance, to obtain a temperature curve graph of the ESR of the electrolytic capacitor at a preset frequency; and acquiring the electrolytic capacitor ESR at the assumed temperature and the preset frequency according to the temperature curve graph. And the limited ESR data is subjected to polynomial fitting to obtain the ESR data at all temperatures, so that the accuracy of subsequent temperature prediction is ensured.
In addition, the method for predicting temperature rise of electrolytic capacitor of frequency converter according to the embodiment of the present invention further includes, before obtaining the predicted temperature of the electrolytic capacitor core package according to the power loss of the electrolytic capacitor and a pre-established electrolytic capacitor simulation model: according to the actual requirements of users, simplifying the internal structure of the electrolytic capacitor and establishing an electrolytic capacitor simulation model, wherein the electrolytic capacitor simulation model comprises a cylinder, the thermal resistance of the electrolytic capacitor, the radial thermal conductivity of the electrolytic capacitor and the axial thermal conductivity of the electrolytic capacitor. By establishing the electrolytic capacitor simulation model, the problems of long calculation time and inaccurate result when the model is established according to the actual internal structure of the electrolytic capacitor are solved.
In addition, the method for predicting temperature rise of electrolytic capacitor of frequency converter according to the embodiment of the present invention further includes, after obtaining the predicted temperature of electrolytic capacitor core package according to the power loss of the electrolytic capacitor and a pre-established electrolytic capacitor simulation model: and when the error between the predicted temperature and the assumed temperature is larger than a preset threshold value, readjusting the assumed temperature of the preset electrolytic capacitor core package, and obtaining the predicted temperature of the electrolytic capacitor again. The accuracy of the prediction of the temperature of the electrolytic capacitor is improved by comparing the predicted temperature with the assumed temperature and performing reverse cycle calculation.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.
FIG. 1 is a flow chart of a method for predicting temperature rise of electrolytic capacitor of an inverter according to a first embodiment of the present invention;
FIG. 2 is a flowchart of a method for predicting temperature rise of electrolytic capacitor of frequency converter according to a second embodiment of the present invention;
FIG. 3 is a flowchart of a method for predicting temperature rise of electrolytic capacitor of frequency converter according to a third embodiment of the present invention;
FIG. 4 is a flowchart of a method for predicting temperature rise of electrolytic capacitor of frequency converter according to a fourth embodiment of the present invention;
FIG. 5 is a simulation model of electrolytic capacitor of a frequency converter according to a fourth embodiment of the present invention;
fig. 6 is a schematic structural diagram of an electrolytic capacitor temperature rise prediction device of an inverter according to a fifth embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that numerous technical details are set forth in order to provide a better understanding of the present application in various embodiments of the present invention. However, the technical solution claimed in the present application can be implemented without these technical details and various changes and modifications based on the following embodiments.
The first embodiment of the invention relates to a method for predicting temperature rise of an electrolytic capacitor of a frequency converter, and the specific flow is shown in figure 1, and the method comprises the following steps:
Specifically, the frequency converter mainly comprises a rectifying unit, a filtering unit, an inverting unit, a braking unit, a driving unit, a detecting unit, a microprocessing unit and the like. The electrolytic capacitor is a core component in the filter unit. The circuit parameters of the frequency converter include a rated voltage, a rated capacity, a rated operating temperature, a surge voltage, and the like, which are only specific examples, and other circuit parameters of the frequency converter may also be included in the actual application, which are not described herein. In addition, according to the circuit structure and circuit parameters of the frequency converter, the ripple current can be obtained through circuit software modeling simulation, and other methods can also be used for obtaining the ripple current, which are not limited here.
And step 102, acquiring an ESR series simulation resistor of the electrolytic capacitor at an assumed temperature and a preset frequency according to the assumed temperature of the core package of the electrolytic capacitor.
Specifically, the series connection simulation resistance of the electrolytic capacitor changes along with the changes of frequency and temperature, the ESR value of the electrolytic capacitor obviously decreases along with the increase of the temperature, and the decreasing trend is more obvious along with the increase of the frequency. At the same temperature, the ESR gradually decreases as the frequency increases. Therefore, ESR is a variable parameter. The ESR value obtained in this step must be set to the same frequency as that used when the ripple current is obtained in step 101. In addition, in the forward design of an actual product, because the final core package temperature of the electrolytic capacitor is not known, an assumed core package temperature of the electrolytic capacitor needs to be assumed, and the assumed temperature can be set at will or can be set according to expert experience.
And 103, acquiring the power loss of the electrolytic capacitor according to the ripple current and the ESR.
Specifically, the power loss of the electrolytic capacitor is equal to the product of the square of the ripple current and the series simulated resistance of the electrolytic capacitor.
And 104, obtaining the predicted temperature of the electrolytic capacitor core package according to the power loss of the electrolytic capacitor and a pre-established electrolytic capacitor simulation model.
Compared with the prior art, the method and the device have the advantages that the core cladding temperature of the electrolytic capacitor in the set working environment can be obtained in a simulation mode according to the pre-established electrolytic capacitor simulation model by obtaining the ripple current, the series simulation resistor and the power loss of the electrolytic capacitor, the accuracy is high, the operation is simple and convenient, and the method and the device are beneficial to large-scale application.
The second embodiment of the present invention relates to a method for predicting temperature rise of electrolytic capacitor of frequency converter, the specific flow is shown in fig. 2, and step 101 includes:
Specifically, in this embodiment, a frequency converter circuit simulation model may be established by circuit simulation software according to the frequency converter circuit structure and related circuit parameters, and the ripple current may be obtained by inputting the related parameters into a simulation interface. Of course, the present embodiment is not limited to specific circuit simulation software, and in actual use, appropriate circuit simulation software may be selected according to the needs of the user.
Compared with the prior art, the method and the device have the advantages that the core cladding temperature of the electrolytic capacitor in the set working environment can be obtained in a simulation mode according to the pre-established electrolytic capacitor simulation model by obtaining the ripple current, the series simulation resistor and the power loss of the electrolytic capacitor, the accuracy is high, the operation is simple and convenient, and the method and the device are beneficial to large-scale application. In addition, the ripple current of the electrolytic capacitor is obtained through simulation, the ripple current value can be quickly obtained, and complex operation and environmental limitation during data acquisition in actual measurement are avoided.
The third embodiment of the present invention relates to a method for predicting temperature rise of electrolytic capacitor of frequency converter, the specific flow is shown in fig. 3, and step 102 includes:
Specifically, the ESR data of the electrolytic capacitor at different temperatures and different frequencies, which is obtained in advance in the present embodiment, may be obtained by providing data from an electrolytic capacitor supplier, or may be obtained by placing the electrolytic capacitor in an oven at different temperatures and performing a test. For example, taking a capacitor of class CD29L400V in river and sea as an example, the ESR variation at different frequencies and different temperatures is measured and obtained, and is detailed in table 1. Of course, no matter which of the above methods is used to acquire data, the number of acquired ESR data is limited, and ESR values at all temperatures and all frequencies cannot be acquired, and polynomial fitting needs to be performed on the acquired limited data.
TABLE 1
And step 302, acquiring an ESR (electrolytic capacitor) under the assumed temperature and the preset frequency according to the temperature curve graph.
Compared with the prior art, the method and the device have the advantages that the core cladding temperature of the electrolytic capacitor in the set working environment can be obtained in a simulation mode according to the pre-established electrolytic capacitor simulation model by obtaining the ripple current, the series simulation resistor and the power loss of the electrolytic capacitor, the accuracy is high, the operation is simple and convenient, and the method and the device are beneficial to large-scale application. In addition, the limited ESR data are subjected to polynomial fitting to obtain the ESR data at all temperatures, and the accuracy of subsequent temperature prediction is guaranteed.
A fourth embodiment of the present invention relates to a method for predicting temperature rise of an electrolytic capacitor of an inverter, the specific flow is as shown in fig. 4, and before step 104, the method further includes:
Specifically, the electrolytic capacitor is mainly made by stacking an anode foil, an electrolytic paper, and a cathode foil, and then winding them into a cylindrical body. In this embodiment, an electrolytic capacitor simulation model is established, and as shown in fig. 5, Kr is the radial thermal conductivity and Ka is the axial thermal conductivity. According to the electrolytic capacitor simulation model, the heat flow analysis software can quickly acquire the predicted temperature of the electrolytic capacitor core package.
Note that, the present embodiment does not limit the specific execution position of step 401, and for convenience of understanding, the present embodiment will be described by taking an example in which step 401 is executed after step 103 and before step 104.
Further, as shown in fig. 4, after step 104, the method further includes:
and 402, when the error between the predicted temperature and the assumed temperature is larger than a preset threshold value, readjusting the assumed temperature of the core package of the electrolytic capacitor, and obtaining the predicted temperature of the electrolytic capacitor again.
Specifically, in the present embodiment, when the error between the predicted temperature and the assumed temperature is greater than the preset threshold, the calculation needs to be performed in reverse cycle, and the core package temperature of one electrolytic capacitor is assumed again until the difference between the two reaches the product design requirement.
Compared with the prior art, the method and the device have the advantages that the core cladding temperature of the electrolytic capacitor in the set working environment can be obtained in a simulation mode according to the pre-established electrolytic capacitor simulation model by obtaining the ripple current, the series simulation resistor and the power loss of the electrolytic capacitor, the accuracy is high, the operation is simple and convenient, and the method and the device are beneficial to large-scale application. In addition, by establishing the electrolytic capacitor simulation model, the problems of long calculation time and inaccurate result when the model is established according to the actual internal structure of the electrolytic capacitor are solved.
In addition, it should be understood that the above steps of the various methods are divided for clarity, and the implementation may be combined into one step or split into some steps, and the steps are divided into multiple steps, so long as the same logical relationship is included in the protection scope of the present patent; it is within the scope of the patent to add insignificant modifications to the algorithms or processes or to introduce insignificant design changes to the core design without changing the algorithms or processes.
A fifth embodiment of the present invention relates to an inverter electrolytic capacitor temperature rise prediction device, as shown in fig. 6, including:
the parameter obtaining module 601 is configured to obtain ripple current of the electrolytic capacitor at a preset frequency according to a circuit structure and circuit parameters of the frequency converter; according to a preset assumed temperature of an electrolytic capacitor core package, acquiring an electrolytic capacitor ESR series connection simulation resistor under the assumed temperature and the preset frequency; acquiring the power loss of an electrolytic capacitor according to the ripple current and the ESR;
and the temperature prediction module 602 is configured to obtain a predicted temperature of the electrolytic capacitor core package according to the power loss of the electrolytic capacitor and a pre-established electrolytic capacitor simulation model.
It should be understood that the present embodiment is a system embodiment corresponding to the first embodiment, and the present embodiment can be implemented in cooperation with the first embodiment. The related technical details mentioned in the first embodiment are still valid in this embodiment, and are not described herein again in order to reduce repetition. Accordingly, the related-art details mentioned in the present embodiment can also be applied to the first embodiment.
A seventh embodiment of the present invention relates to a computer-readable storage medium storing a computer program. The computer program realizes the above-described method embodiments when executed by a processor.
That is, as can be understood by those skilled in the art, all or part of the steps in the method for implementing the embodiments described above may be implemented by a program instructing related hardware, where the program is stored in a storage medium and includes several instructions to enable a device (which may be a single chip, a chip, or the like) or a processor (processor) to execute all or part of the steps of the method described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.
Claims (10)
1. A method for predicting temperature rise of electrolytic capacitors of frequency converters is characterized by comprising the following steps:
acquiring ripple current of an electrolytic capacitor under a preset frequency according to the circuit structure and circuit parameters of the frequency converter;
according to a preset assumed temperature of an electrolytic capacitor core package, acquiring an electrolytic capacitor ESR series connection simulation resistor under the assumed temperature and the preset frequency;
acquiring the power loss of an electrolytic capacitor according to the ripple current and the ESR;
and obtaining the predicted temperature of the electrolytic capacitor core package according to the power loss of the electrolytic capacitor and a pre-established electrolytic capacitor simulation model.
2. The method for predicting the temperature rise of the electrolytic capacitor of the frequency converter according to claim 1, wherein the step of obtaining the ripple current of the electrolytic capacitor at a preset frequency according to the circuit structure and the circuit parameters of the frequency converter comprises the following steps:
establishing a frequency converter circuit simulation model according to the frequency converter circuit structure and the circuit parameters;
and acquiring the ripple current of the electrolytic capacitor under the preset frequency through simulation according to the frequency converter circuit simulation model.
3. The method for predicting the temperature rise of the electrolytic capacitor of the frequency converter according to claim 1, wherein the step of obtaining the ESR series simulation resistance of the electrolytic capacitor at the assumed temperature and the preset frequency according to the assumed temperature of the core package comprises the following steps:
performing polynomial fitting on the ESR data of the electrolytic capacitor at different temperatures and different frequencies, which are obtained in advance, to obtain a temperature curve graph of the ESR of the electrolytic capacitor at a preset frequency;
and acquiring the electrolytic capacitor ESR at the assumed temperature and the preset frequency according to the temperature curve graph.
4. The method for predicting the temperature rise of the electrolytic capacitor of the frequency converter according to claim 1, wherein before obtaining the predicted temperature of the electrolytic capacitor core package according to the power loss of the electrolytic capacitor and a pre-established electrolytic capacitor simulation model, the method further comprises:
and establishing an electrolytic capacitor simulation model according to the quantity and the structure of the electrolytic capacitors, wherein the electrolytic capacitor simulation model comprises a cylinder, the thermal resistance of the electrolytic capacitors, the radial thermal conductivity of the electrolytic capacitors and the axial thermal conductivity of the electrolytic capacitors.
5. The method for predicting the temperature rise of the electrolytic capacitor of the frequency converter according to claim 1, wherein after obtaining the predicted temperature of the electrolytic capacitor core package according to the power loss of the electrolytic capacitor and a pre-established electrolytic capacitor simulation model, the method further comprises:
and when the error between the predicted temperature and the assumed temperature is larger than a preset threshold value, readjusting the assumed temperature of the preset electrolytic capacitor core package, and obtaining the predicted temperature of the electrolytic capacitor again.
6. The method for predicting the temperature rise of the electrolytic capacitor of the frequency converter according to claim 1, wherein the step of obtaining the power loss of the electrolytic capacitor according to the ripple current and the ESR by the following formula comprises:
P＝I2×ESR
wherein, P represents the power loss of the electrolytic capacitor, and I represents the ripple current of the electrolytic capacitor.
7. The method for predicting the temperature rise of the electrolytic capacitor of the frequency converter according to claim 1, wherein obtaining the predicted temperature of an electrolytic capacitor core package according to the power loss of the electrolytic capacitor and a pre-established electrolytic capacitor simulation model comprises:
according to the power loss of the electrolytic capacitor and a pre-established electrolytic capacitor simulation model, the power loss of the electrolytic capacitor is calculated according to the formula delta T-P-Rth＝I2×ESR×RthObtaining the predicted temperature of the electrolytic capacitor core package; alternatively, the first and second electrodes may be,
according to the power loss of the electrolytic capacitor and a pre-established electrolytic capacitor simulation model, obtaining the predicted temperature of the electrolytic capacitor core package through heat flow analysis software simulation;
wherein, DeltaT represents the temperature rise of the core package of the electrolytic capacitor, P represents the power loss of the electrolytic capacitor, and R representsthRepresenting the thermal resistance of the electrolytic capacitor.
8. The method for predicting the temperature rise of the electrolytic capacitor of the frequency converter according to claim 3, wherein before the polynomial fitting of the ESR data of the electrolytic capacitor at different temperatures and different frequencies, the method further comprises:
acquiring ESR data of the electrolytic capacitor at different temperatures and different frequencies according to electrolytic capacitor data provided by an electrolytic capacitor supplier; alternatively, the first and second electrodes may be,
and (4) placing the electrolytic capacitor into thermostats with different temperatures, testing and obtaining ESR data of the electrolytic capacitor at different temperatures and different frequencies.
9. A frequency converter electrolytic capacitor temperature rise prediction device is characterized by comprising:
the parameter acquisition module is used for acquiring ripple current of the electrolytic capacitor under the preset frequency according to the circuit structure and the circuit parameters of the frequency converter; according to a preset assumed temperature of an electrolytic capacitor core package, acquiring an electrolytic capacitor ESR series connection simulation resistor under the assumed temperature and the preset frequency; acquiring the power loss of an electrolytic capacitor according to the ripple current and the ESR;
and the temperature prediction module is used for obtaining the predicted temperature of the electrolytic capacitor core package according to the power loss of the electrolytic capacitor and a pre-established electrolytic capacitor simulation model.
10. A computer-readable storage medium, storing a computer program, wherein the computer program, when executed by a processor, implements the method for predicting temperature rise of electrolytic capacitor of frequency converter according to any one of claims 1 to 8.
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