CN111896817A - Online capacitor life estimation system and method - Google Patents
Online capacitor life estimation system and method Download PDFInfo
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- CN111896817A CN111896817A CN201910371106.5A CN201910371106A CN111896817A CN 111896817 A CN111896817 A CN 111896817A CN 201910371106 A CN201910371106 A CN 201910371106A CN 111896817 A CN111896817 A CN 111896817A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2605—Measuring capacitance
Abstract
The invention provides an online capacitance life estimation system and method, which comprises an online equipment charging data acquisition unit, a capacitance value calculation unit, a capacitance life curve fitting unit and a capacitance accumulated service time calculation unit, wherein the capacitance value calculation unit is used for calculating the capacitance value of a capacitor; the capacitance value of the capacitor is estimated by measuring the charging time of the capacitor, which is not influenced by a load, the accumulated service time of the capacitor is calculated by fitting a service life curve of the capacitor, and the service life of the capacitor is warned by judging the actual capacitance value and the accumulated service time of the capacitor; the calculation amount is small, the estimation precision is high, and the operability is strong.
Description
Technical Field
The invention belongs to the technical field of service life estimation of electronic components, and particularly relates to an online capacitance service life estimation system and method.
Background
The service life of the electrolytic capacitor is influenced by the temperature of the use environment and ripple current, the aging process of the electrolytic capacitor is mainly represented by the change of a capacitance value, leakage current and a loss tangent, and the existing estimation method of the service life of the capacitor mainly comprises the following two methods:
the method comprises the following steps: measuring the discharge time DeltaT of a capacitorPutAnd comparing the discharge time delta T0 with the discharge time delta T0 at the time of factory shipment, and characterizing the capacitor life by delta T/delta T0.
The second method comprises the following steps: and estimating the service life of the capacitor according to indexes such as real-time temperature, voltage, harmonic waves and the like of the capacitor.
In the method I, the discharge time of the capacitor measured is influenced by loads such as a switching power supply, a fan and the like, and the estimated capacitor life precision is poor; the second method has the advantages of more collected signals, large calculation amount, more consumed resources and relatively complex operation.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: an online capacitance lifetime estimation system and method are provided for improving the estimation accuracy of lifetime of an estimated capacitance while reducing the amount of computation.
The technical scheme adopted by the invention for solving the technical problems is as follows: an online capacitance life estimation system comprises an online equipment charging data acquisition unit, a capacitance value calculation unit, a capacitance life curve fitting unit, a capacitance accumulated service time calculation unit and a judgment and early warning unit; the signal output end of the online equipment charging data acquisition unit is connected with the signal input end of the capacitance value calculation unit and is used for outputting the measured charging voltage and charging time of the capacitor; the signal output end of the capacitance value calculating unit is connected with the signal input end of the capacitance accumulated use time calculating unit and is used for outputting the calculated capacitance value of the capacitor; the signal output end of the capacitor life curve fitting unit is connected with the signal input end of the capacitor accumulated service time calculating unit and used for outputting the calculated capacitor life; the signal output end of the capacitance value calculation unit is connected with the signal input end of the judgment and early warning unit and is used for outputting the calculated capacitance value; the signal output end of the capacitance accumulated use time calculation unit is connected with the signal input end of the judgment and early warning unit and is used for outputting the calculated capacitance accumulated use time; the early warning unit is used for comparing the capacitance value of the capacitor with a set value of the capacitance value and comparing the accumulated service time of the capacitor with a set value of time; if the requirements of the set values are met, no early warning is given; and if any one of the parameters does not meet the set value requirement, sending out a capacitor life early warning.
An online capacitance life estimation method comprises the following steps:
step S1: acquiring a voltage value of a capacitor in a charging process through an online equipment charging data acquisition unit, and fitting an RC charging waveform curve;
step S2: calculating capacitance value of the capacitor according to an RC charging equation and the RC charging waveform curve;
step S3: fitting a capacitor life curve according to factory test data of the capacitor;
step S4: calculating the accumulated service time of the capacitor according to the capacitance value of the capacitor and the life curve of the capacitor;
step S5: comparing the capacitance value of the capacitor with a set value of the capacitance value; comparing the accumulated use time of the capacitor with a set time value; if the requirements of the set values are met, no early warning is given; and if any one of the parameters does not meet the set value requirement, sending out a capacitor life early warning.
Further, in step S1, the specific steps include:
step S11: data acquisition is carried out on the capacitor each time the capacitor is initially electrified through an online equipment charging data acquisition unit, and the voltage value of the capacitor in the charging process and the corresponding charging time are recorded;
step S12: and fitting an RC charging waveform curve according to the voltage value and the charging time.
Further, in step S2, the specific steps include: setting a charging time point t0、t1Respectively measure the voltage values U0、U1The load resistance of the charging loop is R; obtaining an arbitrary voltage value U according to the RC charging equation and the RC charging waveform curve obtained in the step S1cCorresponding capacitance value C of capacitorxThe expression of (a) is:
further, in step S3, the specific steps include:
step S31: setting the ring temperature as TaThe ripple ratio ofA/IRRing temperature of T0Capacitor life of L0And the slope of the curve is K, and the capacitance life expression is obtained according to a capacitance life curve provided by a manufacturer:
step S32: and fitting partial sections with approximately equal slopes of the capacitance life curve, taking a curve with the slope K being 1 as a reference life line, and taking a working interval concentration point as a reference to obtain:
step S33: fitting a capacitance-ripple current expression according to the capacitance value of the same series of capacitors and the numerical value of rated ripple current provided by a manufacturer:
step S34: obtaining an expression of the capacitor life with respect to the ring temperature and the capacitance value according to the capacitor life expression and the capacitance value-ripple current expression:
further, in step S4, the specific steps include: set the temperature value T to be collected every fixed time Ta(n)And calculating the number of times of the capacitor service time as i, i is 1, 2, 3, …, n, and obtaining a capacitance accumulated service time expression converted to the reference condition according to the capacitance capacity value expression and the capacitance life expression related to the ring temperature and the capacity value:
further, in step S5, the specific steps include:
step S51: comparing whether the capacitance value and the capacitance value set value satisfy the following formula:
step S52: comparing whether the accumulated use time of the capacitor and the time set value meet the following formula:
the accumulated use time of the capacitor is more than 80000 h;
step S53: and if any comparison result of the step S51 and the step S52 does not meet the requirement of the set value, an early warning prompt is given to the service life of the capacitor.
The invention has the beneficial effects that:
according to the online capacitance service life estimation system and method, the service life of the capacitor is estimated by measuring the charging time which is not influenced by the load, and the online capacitance service life estimation system and method are small in operand, high in estimation accuracy and high in operability.
Drawings
FIG. 1 is a functional block diagram of an embodiment of the present invention.
Fig. 2 is a flow chart of an embodiment of the present invention.
Fig. 3 is a waveform diagram of RC charging according to an embodiment of the present invention.
Fig. 4 is a graph of the loop temperature versus ripple ratio for an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Taking an electrolytic capacitor as an object of an embodiment, referring to fig. 1, the online capacitor life estimation system of the present invention includes an online device charging data acquisition unit (which may be a capacitor charging data acquisition unit), a capacitor capacitance value calculation unit, a capacitor life curve fitting unit, a capacitor accumulated usage time calculation unit, and a judgment and early warning unit; the signal output end of the online equipment charging data acquisition unit is connected with the signal input end of the capacitance value calculation unit and is used for outputting the measured charging voltage and charging time of the capacitor; the signal output end of the capacitance value calculating unit is connected with the signal input end of the capacitance accumulated use time calculating unit and is used for outputting the calculated capacitance value of the capacitor; the signal output end of the capacitor life curve fitting unit is connected with the signal input end of the capacitor accumulated service time calculating unit and used for outputting the calculated capacitor life; the signal output end of the capacitance value calculation unit is connected with the signal input end of the judgment and early warning unit and is used for outputting the calculated capacitance value; the signal output end of the capacitance accumulated use time calculation unit is connected with the signal input end of the judgment and early warning unit and is used for outputting the calculated capacitance accumulated use time; the early warning unit is used for comparing the capacitance value of the capacitor with a set value of the capacitance value and comparing the accumulated service time of the capacitor with a set value of time; if the requirements of the set values are met, no early warning is given; and if any one of the parameters does not meet the set value requirement, sending out a capacitor life early warning.
Referring to fig. 2, an online capacitance lifetime estimation method includes the following steps:
step S1: the voltage value of the electrolytic capacitor in the charging process is collected through the online equipment charging data collection unit, and an RC charging waveform curve is fitted, referring to fig. 3, the online equipment charging data collection unit collects the charging voltage of the capacitor in real time when the capacitor is initially powered on each time and fits according to an ideal charging waveform, and charging waveform data for calculation is obtained:
step S11: data acquisition is carried out on the capacitor by an online equipment charging data acquisition unit during each initial electrification, and the voltage value of the electrolytic capacitor in the charging process and the corresponding charging time are recorded;
step S12: and fitting an RC charging waveform curve according to the voltage value and the charging time.
Step S2: calculating the capacitance value of the electrolytic capacitor according to an RC charging equation and the RC charging waveform curve: setting a charging time point t0、t1Respectively measure the voltage values U0、U1The load resistance of the charging loop is R; obtaining any voltage value U according to the RC charging equation and the RC charging waveform curvecCorresponding capacitance value C of electrolytic capacitorxThe expression of (a) is:
step S3: according to the factory test data fitting electrolytic capacitor life curve of the capacitor, referring to fig. 4, fitting partial sections of the life curve, wherein the slopes of the line sections in the dashed line frame are approximately equal, taking the line sections in the dashed line frame as a reference life line (K is 1), taking a working interval concentration point as a reference, and calculating to obtain the reference capacitor life:
step S31: the ripple ratio when the ring temperature is Ta is set as IA/IRRing temperature of T0Electrolytic capacitor life of L0And the slope of the curve is K, and the life expression of the electrolytic capacitor is obtained according to the life curve of the electrolytic capacitor of the factory test of the electrolytic capacitor:
step S32: and fitting partial sections with approximately equal slopes of the electrolytic capacitor life curve, taking a curve 1 with the slope K equal to 1 as a reference life line, and taking a working interval concentration point as a reference to obtain:
step S33: fitting a capacitance-ripple current expression according to the capacitance value of the electrolytic capacitor in the same series and the numerical value of the rated ripple current provided by a manufacturer:
step S34: obtaining an expression of the electrolytic capacitor life with respect to the ring temperature and the capacitance value according to the electrolytic capacitor life expression and the capacitance value-ripple current expression:
step S4: calculating the accumulated service time of the electrolytic capacitor according to the capacitance value of the electrolytic capacitor and the service life curve of the electrolytic capacitor: set the temperature value T to be collected every fixed time Ta(n)Calculating the service time of the capacitorThe number of times is 1, 2, 3, …, n, and is converted into an expression of the cumulative use time of the electrolytic capacitor under the reference condition according to the expression of the capacitance value of the electrolytic capacitor and the expression of the service life of the electrolytic capacitor on the ring temperature and the capacitance value:
step S5: comparing the capacitance value of the capacitor with a set value of the capacitance value; comparing the accumulated use time of the capacitor with a set time value; if the requirements of the set values are met, no early warning is given; and if any one of the parameters does not meet the requirement of the set value, sending out an electrolytic capacitor service life early warning:
step S51: comparing whether the capacitance value of the electrolytic capacitor and the capacitance value set value satisfy the following formula:
step S52: comparing whether the accumulated using time of the electrolytic capacitor and the time set value meet the following formula:
the accumulated use time of the capacitor is more than 80000 h;
step S53: and if the comparison result of any one of the step S51 and the step S52 does not meet the requirement of the set value, an early warning prompt is given to the service life of the electrolytic capacitor.
In summary, the online capacitance life estimation system and method of the present invention estimate the capacitance value of the capacitor by measuring the charging time of the capacitor that is not affected by the load, calculate the accumulated service time of the capacitor by fitting the life curve of the capacitor, and finally warn the capacitor life by judging the actual capacitance value and the accumulated service time of the capacitor; the calculation amount is small, the estimation precision is high, and the operability is strong.
The above embodiments are only used for illustrating the design idea and features of the present invention, and the purpose of the present invention is to enable those skilled in the art to understand the content of the present invention and implement the present invention accordingly, and the protection scope of the present invention is not limited to the above embodiments. Therefore, all equivalent changes and modifications made in accordance with the principles and concepts disclosed herein are intended to be included within the scope of the present invention.
Claims (7)
1. An online capacitance lifetime estimation system, comprising: the device comprises an online equipment charging data acquisition unit, a capacitance value calculation unit, a capacitance life curve fitting unit, a capacitance accumulated service time calculation unit and a judgment and early warning unit; the signal output end of the online equipment charging data acquisition unit is connected with the signal input end of the capacitance value calculation unit and is used for outputting the measured charging voltage and charging time of the capacitor; the signal output end of the capacitance value calculating unit is connected with the signal input end of the capacitance accumulated use time calculating unit and is used for outputting the calculated capacitance value of the capacitor; the signal output end of the capacitor life curve fitting unit is connected with the signal input end of the capacitor accumulated service time calculating unit and used for outputting the calculated capacitor life; the signal output end of the capacitance value calculation unit is connected with the signal input end of the judgment and early warning unit and is used for outputting the calculated capacitance value; the signal output end of the capacitance accumulated use time calculation unit is connected with the signal input end of the judgment and early warning unit and is used for outputting the calculated capacitance accumulated use time; the early warning unit is used for comparing the capacitance value of the capacitor with a set value of the capacitance value and comparing the accumulated service time of the capacitor with a set value of time; if the requirements of the set values are met, no early warning is given; and if any one of the parameters does not meet the set value requirement, sending out a capacitor life early warning.
2. An online capacitance life estimation method is characterized in that: the method comprises the following steps:
step S1: acquiring a voltage value of a capacitor in a charging process through an online equipment charging data acquisition unit, and fitting an RC charging waveform curve;
step S2: calculating capacitance value of the capacitor according to an RC charging equation and the RC charging waveform curve;
step S3: fitting a capacitor life curve according to factory test data of the capacitor;
step S4: calculating the accumulated service time of the capacitor according to the capacitance value of the capacitor and the life curve of the capacitor;
step S5: comparing the capacitance value of the capacitor with a set value of the capacitance value; comparing the accumulated use time of the capacitor with a set time value; if the requirements of the set values are met, no early warning is given; and if any one of the parameters does not meet the set value requirement, sending out a capacitor life early warning.
3. An online capacitance lifetime estimation method according to claim 2, characterized in that: in the step S1, the specific steps are as follows:
step S11: data acquisition is carried out on the capacitor each time the capacitor is initially electrified through an online equipment charging data acquisition unit, and the voltage value of the capacitor in the charging process and the corresponding charging time are recorded;
step S12: and fitting an RC charging waveform curve according to the voltage value and the charging time.
4. An online capacitance life estimation method according to claim 3, characterized in that: in the step S2, the specific steps are as follows: setting a charging time point t0、t1Respectively measure the voltage values U0、U1The load resistance of the charging loop is R; obtaining an arbitrary voltage value U according to the RC charging equation and the RC charging waveform curve obtained in the step S1cCorresponding capacitance value C of capacitorxThe expression of (a) is:
5. an online capacitance life estimation method according to claim 4, characterized in that: in the step S3, the specific steps are as follows:
step S31: setting the ring temperature as TaThe ripple ratio ofA/IRRing temperature of T0Capacitor life of L0And the slope of the curve is K, and the capacitance life expression is obtained according to a capacitance life curve provided by a manufacturer:
step S32: and fitting partial sections with approximately equal slopes of the capacitance life curve, taking a curve with the slope K being 1 as a reference life line, and taking a working interval concentration point as a reference to obtain:
step S33: fitting a capacitance-ripple current expression according to the capacitance value of the same series of capacitors and the numerical value of rated ripple current provided by a manufacturer:
step S34: obtaining an expression of the capacitor life with respect to the ring temperature and the capacitance value according to the capacitor life expression and the capacitance value-ripple current expression:
6. an online capacitance life estimation method according to claim 5, characterized in that: in the step S4, the specific steps are as follows: set the temperature value T to be collected every fixed time Ta(n)And calculating the number of times of the capacitor service time as i, i is 1, 2, 3, …, n, and obtaining a capacitance accumulated service time expression converted to the reference condition according to the capacitance capacity value expression and the capacitance life expression related to the ring temperature and the capacity value:
7. an online capacitance life estimation method according to claim 6, characterized in that: in the step S5, the specific steps are as follows:
step S51: comparing whether the capacitance value and the capacitance value set value satisfy the following formula:
step S52: comparing whether the accumulated use time of the capacitor and the time set value meet the following formula:
the accumulated use time of the capacitor is more than 80000 h;
step S53: and if any comparison result of the step S51 and the step S52 does not meet the requirement of the set value, an early warning prompt is given to the service life of the capacitor.
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| CN112611930A (en) * | 2020-12-03 | 2021-04-06 | 上海新时达电气股份有限公司 | Information prediction method, system, electronic device and storage medium |
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