CN109613365A - A kind of electrolytic capacitor state online evaluation method and system - Google Patents
A kind of electrolytic capacitor state online evaluation method and system Download PDFInfo
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Abstract
The invention discloses a kind of electrolytic capacitor state online evaluation method and systems, realize the purpose for not depending on system structure and the health status of online evaluation electrolytic capacitor.This method comprises: temperature characterisitic and ESR that the equivalent series resistance ESR for obtaining multiple target electrolytic capacitors is varied with temperature and the frequency characteristic that impedance changes with running frequency, determine the model of fit that the ESR of target electrolytic capacitor is varied with temperature in specific run frequency range according to the temperature characterisitic and the frequency characteristic；The initial ESR of the electrolytic capacitor to be measured is determined according to the running temperature of online electrolytic capacitor to be measured and the model of fit；The voltage ripple and current ripples for obtaining the electrolytic capacitor to be measured online determine the real-time ESR of the electrolytic capacitor to be measured according to the voltage ripple and the current ripples；The state of the electrolytic capacitor to be measured is assessed according to the initial ESR and the real-time ESR.
Description
Technical field
The invention belongs to electronic component the field of test technology, and in particular to a kind of electrolytic capacitor state online evaluation side
Method and system.
Background technique
Electrolytic capacitor is by its energy density is big, capacity is high and low-cost feature in supply convertor such as switchs electricity
It is widely applied in the systems such as source, frequency converter, meanwhile, electrochemical operation principle also becomes the most weak component of system
One of, unpredictability failure may cause whole system paralysis.Fig. 1 is shown in the failure rate of component in switch power supply system
Percent profile.It is therefore desirable to study the loss mechanisms of electrolytic capacitor, its health status is assessed, timely and accurately predicts failure
And it carries out preventive maintenance and can reduce the cost of system-down and maintenance.
The loss of electrolytic capacitor is mainly shown as that electrolyte volatilizees, this also results in the series equivalent electricity of electrolytic capacitor
(Equivalent Series Resistance, ESR) is hindered to increase and capacitance reduction.It therefore can be by according to electrolytic capacitor
The ESR of device assesses the health status of electrolytic capacitor.
State evaluating method of the electrolytic capacitor based on ESR may be divided into offline mode and two kinds of online mode.Offline side
Formula all relies on the precision of measurement component, and need system where electrolytic capacitor to be in off-line state just to remove capacitor complete
At measurement, measurement is inconvenient.And online mode in the prior art, system structure is generally relied on, application range is smaller and realizes
It is complicated.
Summary of the invention
The purpose of the present invention is overcome the deficiencies of the prior art and provide a kind of electrolytic capacitor state online evaluation method and
System realizes the purpose for not depending on system structure and the health status of online evaluation electrolytic capacitor.
The embodiment of the present invention provides a kind of electrolytic capacitor state online evaluation method, comprising:
Obtain temperature characterisitic and ESR that the equivalent series resistance ESR of multiple target electrolytic capacitors is varied with temperature and
The frequency characteristic that impedance changes with running frequency determines target electrolytic capacitor according to the temperature characterisitic and the frequency characteristic
The model of fit that is varied with temperature in specific run frequency range of ESR；Wherein, in the specific run frequency range,
The impedance of target electrolytic capacitor described in the frequency characteristic is mainly shown as ESR；
The electrolytic capacitor to be measured is determined according to the running temperature of online electrolytic capacitor to be measured and the model of fit
The initial ESR of device；Wherein, the electrolytic capacitor to be measured is identical as the target electrolytic capacitor specification；
The voltage ripple and current ripples for obtaining the electrolytic capacitor to be measured online, according to the voltage ripple and described
Current ripples determine the real-time ESR of the electrolytic capacitor to be measured；
The state of the electrolytic capacitor to be measured is assessed according to the initial ESR and the real-time ESR.
In one possible embodiment, the temperature that the ESR for obtaining multiple target electrolytic capacitors is varied with temperature
The frequency characteristic that degree characteristic and ESR and impedance change with running frequency, comprising:
Under identical running frequency, the ESR of the target electrolytic capacitor at different temperatures is obtained, the target is obtained
The temperature characterisitic that the ESR of electrolytic capacitor is varied with temperature；
Setting at a temperature of, obtain ESR and Z of the target electrolytic capacitor in different running frequencies, obtain institute
The frequency characteristic that the ESR and impedance for stating target electrolytic capacitor change with running frequency.
It is described to determine that the target is electrolysed according to the temperature characterisitic and the frequency characteristic in one possible embodiment
The model of fit that the ESR of capacitor is varied with temperature in the specific run frequency range, comprising:
By the temperature characterisitic and the frequency characteristic, when determining that the impedance of the target electrolytic capacitor shows as ESR
The specific run frequency range；
The model of fit is determined according to the specific run frequency range, the temperature characterisitic and the frequency characteristic.
In one possible embodiment, the running temperature of the online electrolytic capacitor to be measured of the basis and institute
State the initial ESR that model of fit determines the electrolytic capacitor to be measured, comprising:
Based on the model of fit, the model of fit formula of the initial ESR of the electrolytic capacitor to be measured is determined
Constant parameter；
According to the model of fit formula after the running temperature and the initialization constant parameter, determine described to be measured
The initial ESR of electrolytic capacitor.
In one possible embodiment, the model of fit formula of the initial ESR of the electrolytic capacitor to be measured,
It is as follows:
ESRS=A+Be-T/C； (1)
Wherein, ESRSFor the initial ESR；A, B and C is the constant parameter；T is the running temperature；E is refers to naturally
Number.
It is described to determine the electrolysis to be measured according to the voltage ripple and the current ripples in one possible embodiment
The real-time ESR of capacitor, comprising:
It is extracted in specific run frequency range described in the voltage ripple and the current ripples using high-pass filter
Voltage harmonic component and current harmonics component, determined according to the voltage harmonic component of extraction and the current harmonics component
The real-time ESR of the electrolytic capacitor to be measured.
It is described true according to the voltage harmonic component of extraction and the current harmonics component in one possible embodiment
The real-time ESR of the fixed electrolytic capacitor to be measured, comprising:
Voltage harmonic component virtual value is determined according to the voltage harmonic component, and electricity is determined according to the current harmonics component
Harmonic component virtual value is flowed, is determined according to the ratio of the voltage harmonic component virtual value and the current harmonics component virtual value
The real-time ESR.
It is described to be had according to the voltage harmonic component virtual value and the current harmonics component in one possible embodiment
The ratio of valid value determines the real-time ESR, using following formula:
ESRa=vcf-rms/icf-rms； (4)
Wherein, vcfFor the voltage ripple；vcf-rmsFor the voltage harmonic component virtual value；icfFor the current ripples
Component；icf-rmsFor the current harmonics component virtual value；The ESRaFor the real-time ESR.
It is described according to the initial ESR and the real-time ESR assessment electrolysis to be measured is electric in one possible embodiment
The state of container, comprising:
The state of the electrolytic capacitor to be measured is assessed according to the ratio cc of the real-time ESR and initial ESR, if 1≤
α < 2 determine that the electrolytic capacitor health status to be measured is good；If 2≤α < 3, the electrolytic capacitor health shape to be measured is determined
State is general；If 3≤α, determine that the electrolytic capacitor health status to be measured is poor.
The embodiment of the present invention also provides a kind of electrolytic capacitor state online evaluation system, comprising:
Characteristics Detection module, what the equivalent series resistance ESR for obtaining multiple target electrolytic capacitors was varied with temperature
The frequency characteristic that temperature characterisitic and ESR and impedance change with running frequency；
Model of fit module, for determining target electrolytic capacitor according to the temperature characterisitic and the frequency characteristic
The model of fit that ESR is varied with temperature in specific run frequency range；Wherein, in the specific run frequency range, institute
The impedance for stating target electrolytic capacitor described in frequency characteristic is mainly shown as ESR；
Initial ESR determining module, the running temperature of the to be measured electrolytic capacitor online for basis and the model of fit
Determine the initial equivalent series resistance of the electrolytic capacitor to be measured；Wherein, the electrolytic capacitor to be measured and target electricity
Electrolysis condenser specification is identical；
On-line checking module, for obtaining the voltage ripple and current ripples of the electrolytic capacitor to be measured online；
Real-time ESR determining module, for determining the electrolysis electricity to be measured according to the voltage ripple and the current ripples
The real-time ESR of container；
Evaluation module, for assessing the shape of the electrolytic capacitor to be measured according to the initial ESR and the real-time ESR
State.
Beneficial effects of the present invention: according to multiple target electrolytic capacitors with the electrolytic capacitor same specification to be measured
The temperature characterisitic and frequency characteristic and Z that the equivalent series resistance ESR of device changes with temperature and running frequency respectively become with frequency
The frequency characteristic of change, the electrolytic capacitor for obtaining the specification meet Z and are mainly shown as that the particular frequency range of ESR and ESR exist
The model of fit varied with temperature in the specific run frequency range, so as to according to the online electrolysis to be measured
The running temperature of capacitor and the model of fit determine the initial ESR of the electrolytic capacitor to be measured；And then basis exists
Line obtains the voltage ripple of the electrolytic capacitor to be measured and current ripples determine the real-time ESR of the electrolytic capacitor to be measured,
The health status of the electrolytic capacitor to be measured can be assessed in real time according to the initial ESR and the real-time ESR, realized not
Rely on the purpose of system structure and the health status of online evaluation electrolytic capacitor.
Detailed description of the invention
Fig. 1 is the failure rate percent profile schematic diagram of component in prior art switch power supply system；
Fig. 2 is a kind of flow chart of electrolytic capacitor state online evaluation method provided by the embodiments of the present application；
Fig. 3 is the schematic equivalent circuit of electrolytic capacitor provided by the embodiments of the present application；
Fig. 4 is the simple equivalent circuit schematic diagram of electrolytic capacitor provided by the embodiments of the present application；
Fig. 5 is the schematic diagram for the temperature characterisitic that ESR provided by the embodiments of the present application is varied with temperature；
Fig. 6 is the schematic diagram for the frequency characteristic that ESR provided by the embodiments of the present application changes with running frequency；
Fig. 7 is the schematic diagram of the model of fit provided by the embodiments of the present application obtained according to temperature characterisitic and frequency characteristic；
Fig. 8 is a kind of schematic diagram of electrolytic capacitor state online evaluation system provided by the embodiments of the present application；
Fig. 9 is the schematic illustration of real-time monitoring system provided by the embodiments of the present application；
Figure 10 is the circuit theory schematic diagram of voltage sample provided by the embodiments of the present application；
Figure 11 is the schematic diagram of electro-temperature provided by the embodiments of the present application acquisition；
Figure 12 is the circuit theory schematic diagram of Boost circuit provided by the embodiments of the present application；
Figure 13 is the structural schematic diagram of the real-time monitoring system provided by the embodiments of the present application using Boost circuit；
Figure 14 is the schematic diagram of the both end voltage ripple of electrolytic capacitor 1 provided by the embodiments of the present application；
Figure 15 is the schematic diagram of the current ripples provided by the embodiments of the present application for flowing through electrolytic capacitor 1；
Figure 16 is that the reality of electrolytic capacitor 1 provided by the embodiments of the present application shows the schematic diagram of ESR；
Figure 17 is the schematic diagram of the health status of electrolytic capacitor 1 provided by the embodiments of the present application.
Specific embodiment
The foregoing is merely the technical concepts and features of invention, and its object is to allow people that can understand the contents of the present invention
And implement accordingly, it is not intended to limit the scope of the present invention.The Spirit Essence of all main technical schemes according to the present invention
The equivalent transformation done or modification should all be covered within the scope of the present invention.
Referring to fig. 2, the embodiment of the present invention provides a kind of electrolytic capacitor state online evaluation method, comprising:
201, temperature characterisitic and ESR and impedance that the ESR of multiple target electrolytic capacitors is varied with temperature are obtained with fortune
The frequency characteristic of line frequency variation, determines the ESR of target electrolytic capacitor in specific run according to temperature characterisitic and frequency characteristic
The model of fit varied with temperature in frequency range；Wherein, in specific run frequency range, target electrolysis electricity in frequency characteristic
The impedance of container is mainly shown as ESR.
202, electrolytic capacitor to be measured is determined according to the running temperature of online electrolytic capacitor to be measured and model of fit
Initial ESR；Wherein, electrolytic capacitor to be measured is identical as target electrolytic capacitor specification.
203, the voltage ripple and current ripples of electrolytic capacitor to be measured are obtained online, according to voltage ripple and current ripples
Determine the real-time ESR of electrolytic capacitor to be measured.
204, the state of electrolytic capacitor to be measured is assessed according to initial ESR and real-time ESR.
It should be noted that multiple target electrolytic capacitors can be understood as same brand, same size and completely new state
Under target electrolytic capacitor, electrolytic capacitor to be measured and target electrolytic capacitor should be same brand and same size.
In the present embodiment, according to multiple targets electrolysis electricity with the electrolytic capacitor to be measured with brand same specification and completely newly
The frequency that the ESR of container changes with the ESR and impedance of the temperature characterisitic of temperature and target electrolytic capacitor with running frequency respectively
Rate characteristic, obtain the ESR of the electrolytic capacitor of the brand specification varied with temperature in the specific run frequency range it is quasi-
Molding type, so as to determine electrolytic capacitor to be measured according to the running temperature and model of fit of online electrolytic capacitor to be measured
Initial ESR；And then electrolytic capacitor to be measured is determined according to the voltage ripple and current ripples that obtain electrolytic capacitor to be measured online
The real-time ESR of device can assess the health status of electrolytic capacitor to be measured according to initial ESR and real-time ESR in real time, realize not
Rely on the purpose of system structure and the health status of online evaluation electrolytic capacitor.
In one possible embodiment, step 201 obtains the temperature that the ESR of multiple target electrolytic capacitors is varied with temperature
The frequency characteristic that characteristic and ESR and impedance change with running frequency, comprising:
Under identical running frequency, the ESR of target electrolytic capacitor at different temperatures is obtained, target electrolytic capacitor is obtained
The temperature characterisitic that the ESR of device is varied with temperature；
Setting at a temperature of, obtain ESR and impedance Z of the target electrolytic capacitor in different running frequencies, obtain mesh
The frequency characteristic that the ESR and impedance for marking electrolytic capacitor change with running frequency.
Therefore, different temperature can be provided in step 201 by insulating box, measure target electrolytic capacitor using measuring instrument
ESR at different temperatures, to obtain temperature characterisitic.It is similar, a stationary temperature, measurement can be provided by insulating box
The frequency characteristic that ESR and impedance of the target electrolytic capacitor under different running frequencies change with running frequency.
And with the increase of running frequency, on the one hand due to target electrolytic capacitor dipole alignment bring energy damage
Lose, ESR can reduce, but usually to electrolytic capacitor, for aluminium electrolutic capacitor, ESR with frequency increase
Change almost seldom.On the other hand since the capacitivity of electrolytic capacitor reduces, effective capacitance can be in the range of tolerable variance of permission
Inside decrease.To which there are a Frequency points, and the impedance of electrolytic capacitor to be made to be mainly shown as the impedance of ideal capacitor, and
As the increase impedance of running frequency reduces, and when running frequency is greater than the Frequency point, the impedance of capacitor is mainly shown as
ESR, and be held essentially constant.Therefore, the fitting of temperature characterisitic and frequency characteristic can be carried out according to above-mentioned characteristic, and can be with
By expressing as follows:
ESRS=A+Be-T/C； (1)
Wherein, ESRSFor initial ESR；A, B and C is constant parameter；T is running temperature；E is natural Exponents.
In a possible embodiment, target electrolytic capacitor is determined according to temperature characterisitic and frequency characteristic in step 201
The model of fit that the ESR of device is varied with temperature in specific run frequency range, comprising:
By frequency characteristic, the specific run frequency range when impedance of target electrolytic capacitor shows as ESR is determined；
Model of fit is determined according to specific run frequency range, temperature characterisitic and frequency characteristic.
Obviously, which can be understood as the frequency model that running frequency is greater than the Frequency point herein
It encloses, that is, impedance is mainly shown as ESR when being greater than the running frequency of the Frequency point, impedance can be considered as ESR at this time, in order to manage
Solution and analysis.
In one possible embodiment, according to the running temperature and fitting of online electrolytic capacitor to be measured in step 202
Model determines the initial ESR of electrolytic capacitor to be measured, comprising:
Based on model of fit, the constant parameter of the model of fit formula of the initial ESR of electrolytic capacitor to be measured is determined；
According to the model of fit formula after running temperature and initialization constant parameter, the initial of electrolytic capacitor to be measured is determined
ESR。
I.e. according to the running temperature of formula (1) and electrolytic capacitor to be measured, the initial ESR of electrolytic capacitor to be measured is calculated.
It should be noted that constant parameter A, B and C are obtained by experiment number, details are not described herein.
After the electrolytic capacitor according to same specification obtains the initial ESR of electrolytic capacitor to be measured, it is also necessary to one with just
The real-time ESR that beginning ESR is compared, ESR can be obtained in the following way in real time in step 203: be mentioned using high-pass filter
The voltage harmonic component and current harmonics component in voltage ripple and current ripples in specific run frequency range are taken, according to extraction
Voltage harmonic component and current harmonics component determine the real-time ESR of electrolytic capacitor to be measured.
In a possible embodiment, electrolysis to be measured is determined according to the voltage harmonic component of extraction and current harmonics component
The real-time ESR of capacitor, comprising:
Voltage harmonic component virtual value is determined according to voltage harmonic component, and current harmonics point is determined according to current harmonics component
Virtual value is measured, real-time ESR is determined according to the ratio of voltage harmonic component virtual value and current harmonics component virtual value.
In one possible embodiment, the ratio according to voltage harmonic component virtual value and current harmonics component virtual value is true
Fixed real-time ESR, using following formula:
ESRa=vcf-rms/icf-rms； (4)
Wherein, vcfFor voltage ripple；vcf-rmsFor voltage harmonic component virtual value；icfFor current ripple component；icf-rmsFor
Current harmonics component virtual value；ESRaFor real-time ESR.
After the initial ESR and real-time ESR that electrolytic capacitor to be measured has been determined, can in different ways for than
Compared in a possible embodiment, the shape of electrolytic capacitor to be measured being assessed in step 204 according to initial ESR and real-time ESR
State, comprising:
It is determined to be measured according to the state that the ratio cc of real-time ESR and initial ESR assesses electrolytic capacitor to be measured if 1≤α < 2
Electrolytic capacitor health status is good；If 2≤α < 3, determine that electrolytic capacitor health status to be measured is general；If 3≤α, determine to
It is poor to survey electrolytic capacitor health status.
For a clearer understanding of the present invention, to principle of the present invention, detailed description are as follows:
Electrolytic capacitor includes electrolyte, metal oxide film and electrode (such as anode and cathode).Usual electrolytic capacitor
It can be indicated with different equivalent models under the operating condition not having, relatively reflect the equivalent circuit of electrolytic capacitor characteristic comprehensively
As shown in figure 3, wherein R1For electrode and its resistance of leading-out terminal, R2For the resistance of electrolyte, R3For the electricity of metal oxide film
Resistance, capacitor C1And C2The capacitance of anode foils and Cathode Foil is respectively indicated, diode D is the one-way conduction of anode metal vaporization membrane
Property, L is equivalent inductance caused by electrode and its leading-out terminal.The very small R of numerical value can be ignored in practical applications3And L, from
And merge R1And R2And C1And C2, so that the equivalent model being simplified is as shown in figure 4, wherein RESRFor series equivalent resistance,
C0For equivalent capacity.
In electrolytic capacitor is worked, the effect of electrolyte directly affects the variation of metal oxide film dielectric behavior, in
Although the chemical reaction in portion and electro-chemical reaction can play the role of repairing to metal oxide film, simultaneously also to metal oxide film
Quality impacts, so that performance decline is led in electrolytic capacitor pressure resistance and leakage.Based on prior art, electrolytic capacitor is difficult to accomplish
Being fully sealed property, so electrolyte can volatilize, gas that internal reaction generates and because caused by ripple current temperature rise can also add
Fast electrolyte volatilization process.And with the volatilization of electrolyte, the ESR of electrolytic capacitor can be gradually increased, and relational expression is as follows:
Wherein, VSIndicate initial electrolysis liquid product, VaIt indicates real and shows electrolyte volume.
When electrolyte vapors away the 30% to 40% of its original value, the ESR of electrolytic capacitor also will increase initial value
2 to 3 times, the health status of electrolytic capacitor will handle defective mode or damage at this time.
Based on above-mentioned theory and inventive concept, first have to determine the ESR according to formula (1)S.By according to such as Fig. 4 institute
Electrolytic capacitor can be considered as an ideal capacitance and a pure resistance string by the equivalent-circuit model of the electrolytic capacitor shown
Connection, the practical absolute value of impedance is exactly the sum of capacitive reactance and ESR, and formula is as follows:
Wherein, Z is impedance, C0Capacitor when running for electrolytic capacitor, f is running frequency.
Be analyzed as follows: as running frequency increases, since dipole is aligned bring energy loss, ESR can be reduced, but logical
Often for aluminium electrolutic capacitor, ESR changes almost very little with the increase of frequency.Place can be understood as that there are a frequencies
Point f0, as running frequency f < f0When,ThenThat is the impedance of electrolytic capacitor is mainly shown as ideal
The impedance of capacitor, and as the increase impedance Z of frequency reduces；And work as running frequency f >=f0When,ThenThat is the impedance of electrolytic capacitor is mainly shown as ESRs, and be held essentially constant.It therefore can be according to this principle
Determine the initial ESR of electrolytic capacitor to be measured.
In order to be verified to this, the present embodiment chooses same brand, same specification and completely new, and parameter is 4500V/2200 μ
F, the aluminium electrolutic capacitor that operating temperature range is -40 DEG C~85 DEG C are surveyed under the specific temperature that insulating box provides using LCR
Impedance Z and ESR value and capacitance C of the instrument measurement target electrolytic capacitor under different temperatures and different frequency are measured, and will be each
The mean value of item parameter is as test result.Obtain temperature characterisitic and frequency characteristic as shown in FIG. 6 as shown in Figure 5.
Wherein, the curve that its ESR value varies with temperature when Fig. 5 is shown in frequency f=1000Hz, Fig. 6 are shown in temperature T=
At 20 DEG C impedance Z and ESR value with frequency change curve.Fig. 5 shows that the ESR value of electrolytic capacitor is in as the temperature increases
Index reduces, and gradually tends towards stability.From fig. 6, it can be seen that the impedance of capacitor is mainly shown as when frequency is less than about 7kHZ
The impedance of ideal capacitor, and when frequency is greater than 7kHZ, the impedance of capacitor is then mainly shown as ESR, divides substantially with theory
Analysis is consistent.In addition, the ESR variation with temperature relationship due to electrolytic capacitor can indicate that embodiment is directed to formula (1)
The experimental data of electrolytic capacitor ESR is fitted to obtain model of fit shown in Fig. 7 using MATLAB simulation software.It can root
Determine that the constant parameter in formula (1) is A=8.69, B=43.54, C=12.30 according to model of fit shown in Fig. 7.According to true
Fixed constant parameter can calculate the opposite ESR conduct of the temperature spot when obtaining the running temperature of electrolytic capacitor to be measured
The initial ESR of electrolytic capacitor to be measured.
It, can be with the voltage of On-line testing electrolytic capacitor to be measured when electrolytic capacitor to be measured is in system and works normally
Ripple and current ripples, still illustrate by taking the capacitor of above-mentioned first fixed brand and specification as an example: medium-and-large-sized transmission system is opened
Frequency is closed generally in 1~5kHz, when the voltage ripple frequency of capacitor is in 7kHz or more, impedance is then mainly shown as ESR,
Therefore the harmonic component of 7kHz or more in voltage ripple and current ripples, such as voltage harmonic point are extracted using high-pass filter
Vcf and current harmonics component icf is measured, voltage harmonic component virtual value v is calculated according to formula (2) and formula (3)cf-rmsWith
Current harmonics component virtual value icf-rms, therefore for online electrolytic capacitor, it can be according to above-mentioned measurement, according to formula
(4) real-time ESR is obtained online.
Considering for health status based on the online electrolytic capacitor of assessment in real time, can be set corresponding parameter and healthy shape
State association, preferably to react assessment result, such as setting is assessed according to the ratio cc of the real-time ESR and initial ESR
The state of the electrolytic capacitor to be measured, while health parameters H is set.Wherein, α calculates such as formula (7):
α=ESRa/ESRS； (7)
As 1≤α < 2, H=1, indicate that the electrolytic capacitor health status to be measured is good；
As 2≤α < 3, H=2, indicate that the electrolytic capacitor health status to be measured is general；
As 3≤α, H=3, indicate that the electrolytic capacitor health status to be measured is poor.
As shown in figure 8, the embodiment of the present invention also provides a kind of electrolytic capacitor state online evaluation system, comprising:
Characteristics Detection module 801, for obtain the ESR of multiple target electrolytic capacitors with the temperature characterisitic of temperature and
The frequency characteristic that ESR and impedance change with running frequency；
Model of fit module 802, for being determined the ESR of target electrolytic capacitor in spy according to temperature characterisitic and frequency characteristic
Determine the model of fit varied with temperature within the scope of running frequency；Wherein, in specific run frequency range, target in frequency characteristic
The impedance of electrolytic capacitor is mainly shown as ESR；
Initial ESR determining module 803, according to the running temperature of online electrolytic capacitor to be measured and model of fit determine to
Survey the initial equivalent series resistance of electrolytic capacitor；Wherein, electrolytic capacitor to be measured is identical as target electrolytic capacitor specification；
On-line checking module 804, for obtaining the voltage ripple and current ripples of electrolytic capacitor to be measured online；
Real-time ESR determining module 805, for determining the real-time of electrolytic capacitor to be measured according to voltage ripple and current ripples
ESR；
Evaluation module 806, for assessing the state of electrolytic capacitor to be measured according to initial ESR and real-time ESR.
In order to better understand the present invention, it in conjunction with electrolytic capacitor state online evaluation system, provides more specific real-time
Monitoring system, corresponding on-line checking module 804, real-time ESR determining module 805 and evaluation module 806.The real-time monitoring system
Schematic diagram is as shown in figure 9, be described as follows:
It is broadly divided into following components, corresponding voltage sampling, current sample, temperature sampling and logical operation.Wherein, electric
Pressure sampling can be carried out according to schematic diagram as shown in Figure 10, R in Figure 1011And R12It is divider resistance, capacitor C11It is isolation capacitance
The flip-flop in v1, the voltage transformer T that no-load voltage ratio is 1 is isolated11Play the mesh of acquisition ac voltage signal and electrical isolation
's；The current ripples ic of Rogowski coil acquisition electrolytic capacitor can be used to realize that non-intruding samples in current sample；Temperature acquisition
It can be acquired by running temperature of the temperature sensor to electrolytic capacitor, as shown in figure 11；Logic operation can be by
DSPACE semi-physical emulation platform is realized, completes the calculating of the real-time ESR of electrolytic capacitor, naturally it is also possible to realize health status
Output.Implementation used by the present embodiment is intended merely to that the present invention will be described, and the present invention is not limited thereto.
In the present embodiment, corresponding test is carried out also according to system shown in Fig. 9, main circuit is as shown in figure 12, uses
The system structure of the main circuit of Figure 12 is as shown in figure 13.Main circuit shown in Figure 12 is that (boosting is cut by Boost under ideal capacitor
Wave) circuit, Boost circuit is very widely used in DC converting field, such as in photovoltaic system and power compensating system extensively
General application.In the present invention, Boost circuit pivot device parameters are provided that input voltage 50V, mos pipe switching frequency 5kHz,
Duty ratio 0.75,100 Ω of load resistance, capacitor use the electrolytic capacitor of above-mentioned same brand same specification, use temperature sensor
Measure the operating temperature of electrolytic capacitor.
System test result is as follows:
According to formula (2)~(4), it is calculated using the ripple information of electrolytic capacitor voltage ripple and current ripples
ESR.For the integrality for improving experiment, this experiment tests two electrolytic capacitors with brand, and wherein electrolytic capacitor 1 is complete
New state, corresponding aging process has been carried out in electrolytic capacitor 2, in this, as control.Figure 14~Figure 17 is electrolytic capacitor
The experimental results of device 1, T=20 DEG C of capacitor temperature, using the experimental data of same available electrolytic capacitor 2,
Two electrolytic capacitor data are as follows:
Electrolytic capacitor 1, initial ESR are 17.3m Ω, and real-time ESR is 19.0m Ω
Electrolytic capacitor 2, initial ESR are 17.3m Ω, and real-time ESR is 55.5m Ω.
Therefore it may determine that 1 health status of electrolytic capacitor is good according to formula (7), 2 health status one of electrolytic capacitor
As.
In the embodiment of the present application, according to multiple targets electricity with the electrolytic capacitor to be measured with brand same specification and completely newly
The ESR of electrolysis condenser changes with the ESR and impedance of the temperature characterisitic of temperature and target electrolytic capacitor with running frequency respectively
Frequency characteristic, the ESR for obtaining the electrolytic capacitor of the brand specification varies with temperature in the specific run frequency range
Model of fit, determine that electrolysis to be measured is electric so as to the running temperature and model of fit according to online electrolytic capacitor to be measured
The initial ESR of container；And then electrolysis to be measured is determined according to the voltage ripple and current ripples that obtain electrolytic capacitor to be measured online
The real-time ESR of capacitor can assess the health status of electrolytic capacitor to be measured according to initial ESR and real-time ESR in real time, real
The purpose of system structure and the health status of online evaluation electrolytic capacitor is not depended on now.
Claims (10)
1. a kind of electrolytic capacitor state online evaluation method characterized by comprising
Obtain the temperature characterisitic and ESR and impedance that the equivalent series resistance ESR of multiple target electrolytic capacitors is varied with temperature
With the frequency characteristic that running frequency changes, target electrolytic capacitor is determined according to the temperature characterisitic and the frequency characteristic
The model of fit that ESR is varied with temperature in specific run frequency range；Wherein, in the specific run frequency range, institute
The impedance for stating target electrolytic capacitor described in frequency characteristic is mainly shown as ESR；
The electrolytic capacitor to be measured is determined according to the running temperature of online electrolytic capacitor to be measured and the model of fit
Initial ESR；Wherein, the electrolytic capacitor to be measured is identical as the target electrolytic capacitor specification；
The voltage ripple and current ripples for obtaining the electrolytic capacitor to be measured online, according to the voltage ripple and the electric current
Ripple determines the real-time ESR of the electrolytic capacitor to be measured；
The state of the electrolytic capacitor to be measured is assessed according to the initial ESR and the real-time ESR.
2. the method as described in claim 1, which is characterized in that the ESR for obtaining multiple target electrolytic capacitors is with temperature
The frequency characteristic that the temperature characterisitic and ESR of variation and impedance change with running frequency, comprising:
Under identical running frequency, the ESR of the target electrolytic capacitor at different temperatures is obtained, obtains the target electrolysis
The temperature characterisitic that the ESR of capacitor is varied with temperature；
Setting at a temperature of, obtain ESR and impedance Z of the target electrolytic capacitor in different running frequencies, obtain institute
The frequency characteristic that the ESR and impedance for stating target electrolytic capacitor change with running frequency.
3. method according to claim 2, which is characterized in that described to be determined according to the temperature characterisitic and the frequency characteristic
The model of fit that the ESR of the target electrolytic capacitor is varied with temperature in the specific run frequency range, comprising:
By the frequency characteristic, the specific run frequency when impedance of the target electrolytic capacitor shows as ESR is determined
Range；
The model of fit is determined according to the specific run frequency range, the temperature characterisitic and the frequency characteristic.
4. the method as described in claim 1, which is characterized in that the online electrolytic capacitor to be measured of the basis it is described
Running temperature and the model of fit determine the initial ESR of the electrolytic capacitor to be measured, comprising:
Based on the model of fit, the constant of the model of fit formula of the initial ESR of the electrolytic capacitor to be measured is determined
Parameter；
According to the model of fit formula after the running temperature and the initialization constant parameter, the electrolysis to be measured is determined
The initial ESR of capacitor.
5. method as claimed in claim 4, which is characterized in that the initial ESR's of the electrolytic capacitor to be measured is described
Model of fit formula, as follows:
ESRS=A+Be-T/C； (1)
Wherein, ESRSFor the initial ESR；A, B and C is the constant parameter；T is the running temperature；E is natural Exponents.
6. the method as described in claim 1, which is characterized in that described to be determined according to the voltage ripple and the current ripples
The real-time ESR of the electrolytic capacitor to be measured, comprising:
The electricity in specific run frequency range described in the voltage ripple and the current ripples is extracted using high-pass filter
Harmonic component and current harmonics component are pressed, according to the voltage harmonic component of extraction and current harmonics component determination
The real-time ESR of electrolytic capacitor to be measured.
7. method as claimed in claim 6, which is characterized in that described according to the voltage harmonic component of extraction and the electricity
Stream harmonic component determines the real-time ESR of the electrolytic capacitor to be measured, comprising:
Voltage harmonic component virtual value is determined according to the voltage harmonic component, determines that electric current is humorous according to the current harmonics component
Wave component virtual value, according to the determination of the ratio of the voltage harmonic component virtual value and the current harmonics component virtual value
Real-time ESR.
8. the method for claim 7, which is characterized in that described according to the voltage harmonic component virtual value and the electricity
The ratio of stream harmonic component virtual value determines the real-time ESR, using following formula:
ESRa=vcf-rms/icf-rms； (4)
Wherein, vcfFor the voltage ripple；vcf-rmsFor the voltage harmonic component virtual value；icfFor the current ripple component；
icf-rmsFor the current harmonics component virtual value；The ESRaFor the real-time ESR.
9. the method as described in claim 1, which is characterized in that described according to the initial ESR and the real-time ESR assesses institute
State the state of electrolytic capacitor to be measured, comprising:
The state that the electrolytic capacitor to be measured is assessed according to the ratio cc of the real-time ESR and initial ESR, if 1≤α <
2, determine that the electrolytic capacitor health status to be measured is good；If 2≤α < 3, the electrolytic capacitor health status to be measured is determined
Generally；If 3≤α, determine that the electrolytic capacitor health status to be measured is poor.
10. a kind of electrolytic capacitor state online evaluation system characterized by comprising
Characteristics Detection module, the temperature that the equivalent series resistance ESR for obtaining multiple target electrolytic capacitors is varied with temperature
The frequency characteristic that characteristic and ESR and impedance change with running frequency；
Model of fit module, for determining that the ESR of target electrolytic capacitor exists according to the temperature characterisitic and the frequency characteristic
The model of fit varied with temperature in specific run frequency range；Wherein, in the specific run frequency range, the frequency
The impedance of target electrolytic capacitor described in characteristic is mainly shown as ESR；
Initial ESR determining module, for being determined according to the running temperature of online electrolytic capacitor to be measured and the model of fit
The initial equivalent series resistance of the electrolytic capacitor to be measured；Wherein, the electrolytic capacitor to be measured and target electrolysis electricity
Containers size is identical；
On-line checking module, for obtaining the voltage ripple and current ripples of the electrolytic capacitor to be measured online；
Real-time ESR determining module, for determining the electrolytic capacitor to be measured according to the voltage ripple and the current ripples
Real-time ESR；
Evaluation module, for assessing the state of the electrolytic capacitor to be measured according to the initial ESR and the real-time ESR.
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