CN115061003A - Method and device for evaluating life of electrolytic capacitor - Google Patents
Method and device for evaluating life of electrolytic capacitor Download PDFInfo
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- 239000003990 capacitor Substances 0.000 title claims abstract description 219
- 238000000034 method Methods 0.000 title claims abstract description 35
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- 238000006243 chemical reaction Methods 0.000 claims description 11
- 230000004913 activation Effects 0.000 claims description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 7
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- 238000009529 body temperature measurement Methods 0.000 description 1
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Abstract
The invention provides a method and a device for evaluating the service life of an electrolytic capacitor, wherein the method comprises the following steps: determining each working period of the electrolytic capacitor, and collecting the central temperature of the electrolytic capacitor in each working period; calculating the solute consumption of the electrolyte of the electrolytic capacitor in each working period according to the central temperature of the electrolytic capacitor in each working period; calculating an initial solute concentration of an electrolyte of the electrolytic capacitor; the remaining life of the electrolytic capacitor is calculated based on the initial solute concentration and the solute consumption. Therefore, the residual service life of the electrolytic capacitor is evaluated according to the central temperature and the initial solute concentration of the electrolytic capacitor, no electric signal is needed, the accuracy of service life evaluation is improved, and the method is simple, reliable and wide in application range.
Description
Technical Field
The invention relates to the technical field of capacitors, in particular to a service life evaluation method and a service life evaluation device of an electrolytic capacitor.
Background
Currently, in evaluating the life of an electrolytic capacitor, the remaining life of the electrolytic capacitor is generally obtained by an electric signal, such as a current value, a capacitance value, and the like, at the time of the operation of the electrolytic capacitor. However, this method cannot achieve dynamic estimation of lifetime, and lacks accuracy, resulting in a limited application range.
Disclosure of Invention
The invention provides the following technical scheme for solving the problem that the application range is limited due to the fact that dynamic evaluation of the service life cannot be realized and accuracy is lacked.
An embodiment of the first aspect of the present invention provides a method for evaluating a lifetime of an electrolytic capacitor, including: determining each working period of the electrolytic capacitor, and collecting the central temperature of the electrolytic capacitor in each working period; calculating the solute consumption of the electrolyte of the electrolytic capacitor in each working period according to the central temperature of the electrolytic capacitor in each working period; calculating an initial solute concentration of an electrolyte of the electrolytic capacitor; calculating a remaining life of the electrolytic capacitor based on the initial solute concentration and the solute consumption.
In addition, the method for evaluating the lifetime of the electrolytic capacitor according to the above-described embodiment of the present invention may also have the following additional technical features.
According to one embodiment of the invention, calculating the solute consumption of the electrolyte of the electrolytic capacitor in each working period according to the central temperature of the electrolytic capacitor in each working period comprises: calculating the solute consumption rate of the electrolyte of the electrolytic capacitor in each working period according to the central temperature of the electrolytic capacitor in each working period; and calculating the solute consumption of the electrolyte of the electrolytic capacitor in each working period according to the solute consumption rate of the electrolyte of the electrolytic capacitor in each working period.
According to one embodiment of the invention, the solute consumption of the electrolyte of the electrolytic capacitor in each working period is calculated according to the following formula:
wherein,
for the working period of the electrolyte of the electrolytic capacitor
Consumption of internal solute, t s 、t e Respectively at the working period of the electrolytic capacitor
The work start time and the work end time in the time slot,
for the working period of the electrolyte of the electrolytic capacitor
Inner solute consumption rate, A is a non-temperature dependent constant, E a To the activation energy of the reaction, k B Is Boltzmann constant, T is the operating period of the electrolytic capacitor
The center temperature of (c).
According to one embodiment of the present invention, the solute consumption of the electrolytic capacitor electrolyte in each operation period is calculated according to the following formula:
wherein,
for the working period of the electrolyte of the electrolytic capacitor
The amount of solute consumed in the interior of the tank,
for the working period of the electrolyte of the electrolytic capacitor
Internal rate of solute consumption, T C For the working period of the electrolytic capacitor
A is a non-temperature dependent constant, E a To the activation energy of the reaction, k B Boltzmann constant;
calculating an initial solute concentration of an electrolyte of the electrolytic capacitor according to the following formula:
wherein,
is an initial solute concentration of an electrolyte of the electrolytic capacitor,
is the upper limit operating temperature of the electrolytic capacitor,
is the electrolytic capacitor in
Rated life of the device.
According to one embodiment of the invention, the solute consumption of the electrolyte of the electrolytic capacitor in each working period is calculated according to the following formula:
according to an embodiment of the present invention, calculating the remaining life of the electrolytic capacitor based on the initial solute concentration and the solute consumption comprises: accumulating solute consumption of the electrolyte of the electrolytic capacitor in each working period; calculating a product between the initial solute concentration and a preset coefficient; comparing the accumulated solute consumption with the product, and calculating the residual life of the electrolytic capacitor according to the comparison result; wherein the end of life of the electrolytic capacitor is determined when the relationship between the accumulated solute consumption and the product satisfies the following equation:
wherein,
for the ith operating period of the electrolytic capacitor,
for the working period of the electrolyte of the electrolytic capacitor
The amount of solute consumed in the interior of the tank,
alpha is a coefficient which is an initial solute concentration of an electrolyte of the electrolytic capacitor.
According to one embodiment of the invention, the electrolytic capacitor comprises a terminal board, an insulating sleeve, an aluminum shell and a core package, wherein the terminal board comprises an outgoing terminal, a thimble and a temperature measuring device injected into the thimble.
According to one embodiment of the invention, the temperature measuring device is completely sealed and injected inside the thimble of the terminal board, and the part of the temperature measuring device exposed out of the surface of the terminal board is provided with a standard interface.
According to one embodiment of the invention, the temperature measuring device is completely sealed and injected inside the thimble of the terminal board, the terminal board further comprises a locking device, the temperature measuring device is led out from the inside of the thimble to be connected with the temperature measuring instrument, and the locking device is used for fixing the temperature measuring device.
An embodiment of a second aspect of the present invention provides a lifetime evaluation apparatus for an electrolytic capacitor, including: the acquisition module is used for determining each working period of the electrolytic capacitor and acquiring the central temperature of the electrolytic capacitor in each working period; the first calculation module is used for calculating the solute consumption of the electrolyte of the electrolytic capacitor in each working period according to the central temperature of the electrolytic capacitor in each working period; a second calculation module for calculating an initial solute concentration of an electrolyte of the electrolytic capacitor; and the third calculation module is used for calculating the residual life of the electrolytic capacitor according to the initial solute concentration and the solute consumption.
According to the technical scheme of the embodiment of the invention, the central temperature of the electrolytic capacitor in each working period is collected, the solute consumption of the electrolyte of the capacitor is calculated according to the collected central temperature, and the residual life of the electrolytic capacitor is calculated according to the initial solute concentration and the solute consumption. Therefore, the residual service life of the electrolytic capacitor is evaluated according to the central temperature and the initial solute concentration of the electrolytic capacitor, no electric signal is needed, the accuracy of service life evaluation is improved, and the method is simple, reliable and wide in application range.
Drawings
FIG. 1 is a flowchart of a method for evaluating the lifetime of an electrolytic capacitor according to an embodiment of the present invention.
FIG. 2 is a graph of solute depletion rate versus core temperature for one embodiment of the present invention.
FIG. 3 is a graph of core temperature versus operating time for one embodiment of the present invention.
FIG. 4 is a graph of solute concentration versus on-time for one embodiment of the present invention.
FIG. 5 is a graph of core temperature versus operating time for an example of the present invention.
FIG. 6 is a schematic view showing the structure of an electrolytic capacitor according to an embodiment of the present invention.
Fig. 7 is a schematic view showing the structure of a terminal plate of an electrolytic capacitor according to an example of the present invention.
Fig. 8 is a schematic view showing the structure of a terminal plate of an electrolytic capacitor according to another example of the present invention.
FIG. 9 is a block diagram schematically showing a life evaluation device for an electrolytic capacitor according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
FIG. 1 is a flowchart of a method for evaluating the lifetime of an electrolytic capacitor according to an embodiment of the present invention.
The electrolytic capacitor in the embodiment of the invention can be a bolt type aluminum electrolytic capacitor.
As shown in fig. 1, the method for evaluating the lifetime of an electrolytic capacitor includes the following steps S1 to S4.
And S1, determining each working period of the electrolytic capacitor, and collecting the central temperature of the electrolytic capacitor in each working period.
In the related art, an electric signal is applied to a capacitor, and a capacitance parameter is estimated from a change in the electric signal, thereby calculating a capacitance temperature. The method is lack of accuracy, and therefore, the temperature measuring device is arranged in the electrolytic capacitor in the embodiment of the invention, so that the central temperature of the electrolytic capacitor is acquired in real time when the electrolytic capacitor works, the dynamic acquisition of the capacitance temperature is realized, and the accuracy of temperature acquisition can be improved.
Specifically, each work period of the electrolytic capacitor which has been finished in the history of work is determined, wherein each work period refers to a continuous work time period, and the central temperature of the electrolytic capacitor in each work period can be collected in real time through a temperature measuring device, so that a plurality of central temperatures in each work period can be obtained, including the central temperature at the beginning of work and the central temperature at the end of work.
And S2, calculating the solute consumption of the electrolyte of the electrolytic capacitor in each working period according to the central temperature of the electrolytic capacitor in each working period.
Specifically, after the central temperatures in the respective operation periods are obtained, the solute consumption of the electrolytic capacitor electrolyte is calculated based on all the central temperatures in each operation period, thereby obtaining the solute consumption in each operation period.
And S3, calculating the initial solute concentration of the electrolyte of the electrolytic capacitor.
Calculating an initial solute concentration of an electrolyte of the electrolytic capacitor may include: determining the upper limit working temperature and the rated service life of the electrolytic capacitor at the upper limit working temperature; and calculating the initial solute concentration of the electrolyte of the electrolytic capacitor according to the upper limit working temperature and the rated service life.
That is, the initial solute concentration may refer to a guaranteed concentration for which the capacitor has been operated at the upper operating temperature for a time sufficient to achieve the rated life.
Specifically, the initial solute concentration of the electrolyte may be calculated in any feasible and reliable manner, and may also be calculated based on the upper operating temperature of the electrolytic capacitor, and the rated life.
It should be noted that, in practical applications, steps S1 and S2 may be executed first, and then step S3 is executed, step S3 may be executed first, and then steps S1 and S2 may be executed, and step S3, step S1, and step S2 may be executed at the same time.
And S4, calculating the residual life of the electrolytic capacitor according to the initial solute concentration and the solute consumption.
Specifically, after the initial solute concentration and the solute consumption amount in each period are obtained, the remaining life of the electrolytic capacitor is calculated from the initial solute concentration and all the solute consumption amounts. The method can accumulate all solute consumptions, compare the accumulated solute consumptions with the initial solute concentration, and calculate the remaining life of the electrolytic capacitor according to the comparison result, wherein when the accumulated solute consumptions are close to the initial solute concentration, Al can be provided in the electrolyte 2 O 3 The solute is consumed and the capacitor has a service lifeAnd finally, an alarm prompt can be performed.
Based on the above description, it can be seen that the temperature measuring device is built in the electrolytic capacitor in the embodiment of the present invention, so that the capacitor has a function of dynamic temperature detection, the solute consumption of the electrolyte of the capacitor is calculated according to the collected central temperature, and the remaining life of the electrolytic capacitor is calculated according to the initial solute concentration and the solute consumption. Compared with the related technology, the embodiment of the invention can accurately test the temperature of the capacitor hot spot in real time, and is suitable for accurately evaluating the dynamic life of the bolt type aluminum electrolytic capacitor in the applications of a high-voltage frequency converter, a universal frequency converter, a UPS (Uninterruptible Power Supply) and the like.
According to the method for evaluating the service life of the electrolytic capacitor, provided by the embodiment of the invention, the residual service life of the electrolytic capacitor is evaluated according to the central temperature and the initial solute concentration of the electrolytic capacitor, no electric signal is needed, the accuracy of service life evaluation is improved, and the method is simple, reliable and wide in application range.
In an embodiment of the present invention, the step S2 may include: calculating the solute consumption rate of the electrolyte of the electrolytic capacitor in each working period according to the central temperature of the electrolytic capacitor in each working period; and calculating the solute consumption of the electrolyte of the electrolytic capacitor in each working period according to the solute consumption rate of the electrolyte of the electrolytic capacitor in each working period.
Specifically, the performance of an electrolytic capacitor is closely related to the chemical reaction environment inside it, which describes the temperature dependence of the chemical reaction rate according to the Arrhenius equation in chemical kinetics:
in the formula (1), C is involved in Al generation in the electrolyte 2 O 3 T is a reaction time(s), R (T) is a reaction rate (referred to as a solute consumption rate in the examples of the present invention) (mol.L-1.h-1), A is a non-temperature dependent constant, Ea is a reaction activation energy (eV), k is B Is Boltzmann Boltzmann constant (about 8.62X 10) -5 eV), T is the operating period of the electrolytic capacitor
The center temperature of (c).
Wherein, the relationship curve between R (T) and T is shown in FIG. 2, the relationship curve between T and the working time T is shown in FIG. 3,
for a continuous period of operation: operation start time t s End time t of operation e Working time delta T and working start capacitor center temperature T cs And end-of-service capacitor center temperature T ce 。
Therefore, after the central temperature of each working period is obtained, the solute consumption rate of the electrolyte in each working period is calculated according to each central temperature, and then the solute consumption of the electrolyte in each working period is calculated according to the solute consumption rate of the electrolyte in each working period.
Further, the solute consumption of the electrolyte of the electrolytic capacitor in each operation period can be calculated according to the following formula:
wherein,
for the working period of the electrolyte of an electrolytic capacitor
Internal solute consumption, t s 、t e Respectively at the working stage of the electrolytic capacitor
The work start time and the work end time in the time slot,
for the working period of the electrolyte of an electrolytic capacitor
Inner solute consumption rate, A is a non-temperature dependent constant, E a To the activation energy of the reaction, k B Is Boltzmann constant, and T is the operating period of the electrolytic capacitor
The center temperature of (c).
In particular, during any one of the successive periods of operation
In the method, the formula (3) can be used to calculate the working period of the electrolytic capacitor during the working period of the electrolyte according to the central temperatures in the period
The solute consumption rate is then integrated by formula (2) to obtain the working period of the electrolyte of the electrolytic capacitor
Internal solute consumption
。
From equation (3), the following equation can be obtained:
in the formula (4), C (t) e ), C(t s ) Respectively at t for electrolyte e ，t s Solute concentration at time point. Solute concentration of electrolyte andthe operating time t is plotted in FIG. 4, where C 0 The initial solute concentration in the electrolyte at the initial conditions can generally be considered as the upper working temperature T of the capacitor max The working time can reach the rated service life L 0 The guaranteed concentration of (c).
And then accumulating all solute consumption, comparing the accumulated solute consumption with the initial solute concentration, and calculating the residual life of the electrolytic capacitor according to the comparison result.
It should be noted that, according to the equations (2) and (3), the solute consumption rate r (T) varies with the central temperature T, and the central temperature T also varies with the operating time T, so that for the sake of simplicity of calculation, the solution of the equation can be simplified by further differentiating the operating time Δ T in fig. 3, which is described in detail below:
as shown in fig. 5, when the electrolytic capacitor is operated for a certain small period of time Δ t u Internal time (Δ t) u < Δ T), the temperature of the centre of the capacitor remains substantially constant, i.e. T cs ≈T ce Assumed to be T c At Δ t u The reaction rate R (T) is reduced to a constant R (T) c )。
That is, in one embodiment of the present invention, the solute consumption of the electrolyte of the electrolytic capacitor during each operating period can be calculated according to the following formula:
wherein,
for the working period of the electrolyte of an electrolytic capacitor
The amount of solute consumed in the interior of the tank,
for the u-th operation period of time,
for the working period of the electrolyte of an electrolytic capacitor
Internal rate of solute consumption, T C For the working period of electrolytic capacitors
A is a non-temperature dependent constant, E a To the activation energy of the reaction, k B Boltzmann constant;
calculating an initial solute concentration of an electrolyte of the electrolytic capacitor according to the following formula:
wherein,
is the initial solute concentration of the electrolyte of the electrolytic capacitor,
in order to achieve the upper limit operating temperature of the electrolytic capacitor,
is an electrolytic capacitor in
Rated life of the device.
It is noted that for a given electrolytic capacitor, L 0 And T max Are all known quantities, e.g. the capacitance series corresponds to T when the capacitance series is in the specification of 105 ℃ for 5000h max =105℃， L 0 =5000 h. Therefore, for a given electrolytic capacitor, the initial solute concentration of its electrolyte can be calculated according to equation (6).
Specifically, the time period Δ t u Can obtain values according to the characteristics of external storage and the change condition of the working condition of the capacitorThe time can be selected from 0.1s to 1 h. Δ t u The shorter the calculation time is, the higher the calculation accuracy is, but the higher requirement is put on external storage, and the equipment cost is increased; Δ t u Longer, it may increase the error of calculation and reduce the equipment cost.
Preferably, the time period Δ t u Can be between 1s and 30 min.
More preferably, the time period Δ t u Can be between 10s and 5 min.
At a time interval Δ t u In addition, the optimal calculation formula of the solute consumption is formula (5), and the electrolyte can be calculated in each working period according to the formula (5)
The initial solute concentration of the electrolyte can be calculated according to the formula (6).
According to the formulas (5) and (6):
in formula (7), the
The following can be obtained:
in the formula (8), K is a constant relating to the aluminum foil and the electrolyte, and may be generally 5 to 10. When K is 10, it can be understood that the temperature drops by 10K, the time interval Δ t u The internal electrolyte solute consumption rate is halved.
That is, in one example of the present invention, the solute consumption of the electrolyte of the electrolytic capacitor in each operation period can be calculated according to the formula (8).
In an embodiment of the present invention, the step S4 may include: accumulating the solute consumption of the electrolyte of the electrolytic capacitor in each working period; calculating the product between the initial solute concentration and a preset coefficient; and comparing the accumulated solute consumption with the product, and calculating the residual life of the electrolytic capacitor according to the comparison result.
Wherein the end of life of the electrolytic capacitor is determined when the relationship between the accumulated solute consumption and the product satisfies the following equation:
wherein,
for the ith operating period of the electrolytic capacitor,
for the working period of the electrolyte of an electrolytic capacitor
The amount of solute consumed in the interior of the tank,
the initial solute concentration of the electrolyte of the electrolytic capacitor, alpha is a coefficient, and a reasonable range can be selected according to the allowance requirement of the initial design, such as 0.85-0.95.
Specifically, the external storage is for each time period
The total solute consumption in the electrolyte can be calculated in time by performing accumulated calculation on the internal solute consumption
. And when the early warning method is substituted into the formula (9), the early warning can be carried out on whether the service life of the capacitor is ended or not.
That is, in the embodiment of the present invention, based on the collected central temperature, the solute consumption amount of the electrolyte of the electrolytic capacitor in each operation period may be calculated according to the formulas (2), (5), and/or (8). The service life of the capacitor can be evaluated only according to the acquired temperature, a large amount of logic operation and judgment can be reduced, and compared with a scheme of applying an electric signal to the capacitor and responding according to the signal, the calculation mode is greatly simplified.
The method for evaluating the life of the electrolytic capacitor is described above, and the structure of the electrolytic capacitor will be described below when it is a bolt-type aluminum electrolytic capacitor.
In an embodiment of the present invention, as shown in fig. 6, the electrolytic capacitor includes a terminal board 1, an insulating sleeve 2, an aluminum case 3 and a core package 4, wherein the terminal board 1 includes a leading-out terminal 5, a thimble 6 and a temperature measuring device 7 injected into the thimble 6.
In one example, as shown in fig. 6 and 7, the temperature measuring device 7 is completely sealed and injection-molded inside the thimble 6 of the terminal board 1, so that the related electrical insulation requirements can be met, and the part of the temperature measuring device 7 exposed out of the surface of the terminal board 1 is provided with a standard interface 8, so that the temperature measurement is convenient.
In one example, as shown in fig. 8, the temperature measuring device 7 is completely sealed and injection-molded inside the thimble 6 of the terminal board 1, which can meet the related electrical insulation requirements, the terminal board 1 further comprises a locking device 9, the temperature measuring device 7 is led out from the inside of the thimble 6 by a proper length to be connected with a temperature measuring instrument, and the locking device 9 is used for fixing the temperature measuring device 7, so that the temperature measuring device 7 is ensured not to be loosened in the life cycle of the capacitor.
Specifically, a temperature measuring device is arranged in the thimble position of the capacitor terminal board 1, so that the internal hot spot center temperature of the capacitor during working can be accurately measured, the capacitor hot spot temperature can be accurately measured in real time, and the temperature measuring device 7 can be a thermocouple, a thermistor and the like, but is not limited to any temperature measuring device of the two devices.
In conclusion, the temperature measuring device is arranged in the thimble part of the capacitor terminal board, so that the temperature of the internal hot spot of the capacitor during working can be accurately measured; the corresponding relation between the solute consumption rate of electrolyte in the capacitor and the temperature is provided; calculating the solute consumption of the electrolyte of the capacitor according to the change of the temperature; and calculating the residual life of the capacitor according to the accumulated solute consumption of the electrolyte of the capacitor.
The present invention also provides a life evaluation device for an electrolytic capacitor, corresponding to the life evaluation method for an electrolytic capacitor in the above embodiment.
FIG. 9 is a block diagram schematically showing a life evaluation device for an electrolytic capacitor according to an embodiment of the present invention.
As shown in fig. 9, the life evaluation device of the electrolytic capacitor includes: an acquisition module 10, a first calculation module 20, a second calculation module 30 and a third calculation module 40.
The acquisition module 10 is used for determining each working period of the electrolytic capacitor and acquiring the central temperature of the electrolytic capacitor in each working period; the first calculating module 20 is used for calculating the solute consumption of the electrolyte of the electrolytic capacitor in each working period according to the central temperature of the electrolytic capacitor in each working period; the second calculation module 30 is used for calculating the initial solute concentration of the electrolyte of the electrolytic capacitor; the third calculating module 40 is used for calculating the residual life of the electrolytic capacitor according to the initial solute concentration and the solute consumption.
It should be noted that, for the specific embodiment and the implementation principle of the life evaluation device of the electrolytic capacitor, reference may be made to the specific embodiment of the life evaluation method of the electrolytic capacitor, and details are not described here for avoiding redundancy.
The service life evaluation device of the electrolytic capacitor provided by the embodiment of the invention evaluates the residual service life of the electrolytic capacitor according to the central temperature and the initial solute concentration of the electrolytic capacitor without electric signals, improves the accuracy of service life evaluation, and is simple, reliable and wide in application range.
In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. The meaning of "plurality" is two or more unless specifically limited otherwise.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments. In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A method for evaluating a lifetime of an electrolytic capacitor, comprising:
determining each working period of the electrolytic capacitor, and collecting the central temperature of the electrolytic capacitor in each working period;
calculating the solute consumption of the electrolyte of the electrolytic capacitor in each working period according to the central temperature of the electrolytic capacitor in each working period;
calculating an initial solute concentration of an electrolyte of the electrolytic capacitor;
calculating a remaining life of the electrolytic capacitor based on the initial solute concentration and the solute consumption.
2. The method for evaluating a lifetime of an electrolytic capacitor according to claim 1, wherein calculating a solute consumption amount of an electrolyte of the electrolytic capacitor in each operation period based on a central temperature of the electrolytic capacitor in each operation period comprises:
calculating the solute consumption rate of the electrolyte of the electrolytic capacitor in each working period according to the central temperature of the electrolytic capacitor in each working period;
and calculating the solute consumption of the electrolyte of the electrolytic capacitor in each working period according to the solute consumption rate of the electrolyte of the electrolytic capacitor in each working period.
3. The method for evaluating a lifetime of an electrolytic capacitor according to claim 2, wherein the solute consumption of the electrolyte of the electrolytic capacitor in each operation period is calculated according to the following formula:
wherein,
for the working period of the electrolyte of the electrolytic capacitor
Internal solute consumption, t s 、t e Respectively during the working period of the electrolytic capacitor
The work start time and the work end time in the time slot,
for the working period of the electrolyte of the electrolytic capacitor
Inner rate of solute consumption, A is a non-temperature dependent constant, E a To the activation energy of the reaction, k B Is Boltzmann constant, T is the operating period of the electrolytic capacitor
The center temperature of (c).
4. The method for evaluating a lifetime of an electrolytic capacitor according to claim 2, wherein the solute consumption of the electrolyte of the electrolytic capacitor in each operation period is calculated according to the following formula:
wherein,
for the working period of the electrolyte of the electrolytic capacitor
The amount of solute consumed in the interior of the tank,
for the working period of the electrolyte of the electrolytic capacitor
Internal rate of solute consumption, T C For the working period of the electrolytic capacitor
A is a non-temperature dependent constant, E a To the activation energy of the reaction, k B Boltzmann constant;
calculating an initial solute concentration of an electrolyte of the electrolytic capacitor according to the following formula:
wherein,
is an initial solute concentration of an electrolyte of the electrolytic capacitor,
is the upper limit operating temperature of the electrolytic capacitor,
is the electrolytic capacitor in
Rated life of the device.
5. The method for evaluating a lifetime of an electrolytic capacitor according to claim 4, wherein the solute consumption of the electrolyte of the electrolytic capacitor in each operation period is calculated according to the following formula:
6. the method of claim 1, wherein calculating the remaining life of the electrolytic capacitor from the initial solute concentration and the solute consumption comprises:
accumulating solute consumption of the electrolyte of the electrolytic capacitor in each working period;
calculating a product between the initial solute concentration and a preset coefficient;
comparing the accumulated solute consumption with the product, and calculating the residual life of the electrolytic capacitor according to the comparison result;
wherein the end of life of the electrolytic capacitor is determined when the relationship between the accumulated solute consumption and the product satisfies the following equation:
wherein,
for the ith operating period of the electrolytic capacitor,
for the working period of the electrolyte of the electrolytic capacitor
The amount of solute consumed in the interior of the tank,
α is a coefficient which is an initial solute concentration of an electrolyte of the electrolytic capacitor.
7. The method for evaluating the lifetime of an electrolytic capacitor as claimed in claim 1, wherein the electrolytic capacitor comprises a terminal board, an insulating sleeve, an aluminum shell and a core package, wherein the terminal board comprises an outgoing terminal, a thimble and a temperature measuring device injected into the thimble.
8. The method for evaluating the lifetime of an electrolytic capacitor as claimed in claim 7, wherein the temperature measuring device is completely injection-molded in the terminal plate pin by sealing, and the portion of the temperature measuring device exposed from the surface of the terminal plate has a standard interface.
9. The method for evaluating the lifetime of an electrolytic capacitor as claimed in claim 7, wherein the temperature measuring device is completely injection-molded in a hermetically sealed manner inside a thimble of the terminal plate, the terminal plate further comprises a locking device, the temperature measuring device is led out from the inside of the thimble to be connected to the temperature measuring instrument, and the locking device is used for fixing the temperature measuring device.
10. An electrolytic capacitor life evaluation device, characterized by comprising:
the acquisition module is used for determining each working period of the electrolytic capacitor and acquiring the central temperature of the electrolytic capacitor in each working period;
the first calculation module is used for calculating the solute consumption of the electrolyte of the electrolytic capacitor in each working period according to the central temperature of the electrolytic capacitor in each working period;
a second calculation module for calculating an initial solute concentration of an electrolyte of the electrolytic capacitor;
and the third calculation module is used for calculating the residual life of the electrolytic capacitor according to the initial solute concentration and the solute consumption.
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