CN110346646A - Super capacitor internal resistance measuring method, device and computer readable storage medium - Google Patents
Super capacitor internal resistance measuring method, device and computer readable storage medium Download PDFInfo
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- CN110346646A CN110346646A CN201910625531.2A CN201910625531A CN110346646A CN 110346646 A CN110346646 A CN 110346646A CN 201910625531 A CN201910625531 A CN 201910625531A CN 110346646 A CN110346646 A CN 110346646A
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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
- G01R27/08—Measuring resistance by measuring both voltage and current
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Abstract
The invention discloses a kind of super capacitor internal resistance measuring method, device and computer readable storage mediums, and provided method and step includes: S1: inputting sinusoidal signal U to super capacitor and sample resistance；S2: the output voltage U of super capacitor is acquired1With the output voltage U of sample resistance2；S3: the phase delta θ of super capacitor output voltage is obtained using fft algorithm；S4: the current value I on sample resistance is obtained；S5: according to formulaObtain the internal resistance value of super capacitor.The present invention improves the accuracy of super capacitor internal resistance measurement, simplification detection method and detection device design.
Description
Technical field
The invention mainly relates to electronic device detection technique field, a kind of super capacitor internal resistance measuring method, device are refered in particular to
And computer readable storage medium.
Background technique
Super capacitor as mechanism of new electrochemical power sources, it is high with its power density, have extended cycle life, safety is good, environmentally protective
The features such as, become current national governments vigorously support and the key strategy research object developed and many scientific research persons research
Emphasis and hot spot.Increasingly mature with super capacitor technology, application field constantly expands, and is not only widely used in various portable
Formula electronic equipment, but also be applied to electric car, power compensation equipment etc., it has broad prospects.
Series equivalent resistance is one of important parameter of super capacitor, is the important indicator for assessing super capacitor performance.It is super
Grade capacitor internal resistance detection be guarantee its use process in reliability, safety, extension super capacitor service life provide according to
According to.
Existing super capacitor internal resistance detection method is broadly divided into following a few classes:
(1) injection method is exchanged
When using exchange injection method measurement super capacitor internal resistance, ac current signal, electric current need to be injected to super capacitor
Virtual value is I, then measures the output voltage of super capacitor, voltage effective value U.And super capacitor output voltage with
The phase difference θ of electric current, therefore the impedance of super capacitor may be expressed as:
The then internal resistance of super capacitor are as follows:
Exchange injection method is not required to carry out discharge treatment to super capacitor the on-line measurement, it can be achieved that super capacitor internal resistance.By
It is several milliohms in the internal resistance value of super capacitor, therefore the value of U is usually mV grades, weak output signal, and when measurement is easily flooded by noise.
(2) DC injection method
DC injection method charges to super capacitor using DC constant current power supply, current effective value I.Work as charging voltage
When reaching the voltage rating of super capacitor, then discharge treatment is carried out to super capacitor, discharged moment, the voltage meeting of super capacitor
There is the pressure drop Δ U an of great-jump-forward3.Then super capacitor internal resistance are as follows:
DC injection method can not achieve the on-line measurement of super capacitor internal resistance, and offline heavy-current discharge will affect super electricity
The service life and quality of appearance.
Currently, super capacitor internal resistance detection device is designed according to the principle of exchange injection method, and complex circuit designs, measurement
Precision is low, and Injection Signal frequency is single, is unfavorable for fully understanding super capacitor internal resistance.
Summary of the invention
For technical problem of the existing technology, the present invention provides a kind of measuring method of super capacitor internal resistance, device
And computer readable storage medium, the accuracy of super capacitor internal resistance measurement can be improved, simplification detection method and detection device are set
Meter.
In order to solve the above technical problems, first aspect present invention provides a kind of measuring method of super capacitor internal resistance, institute
The method of stating includes:
S1: sinusoidal signal U is inputted to super capacitor and sample resistance；
S2: the output voltage U of super capacitor is acquired1With the output voltage U of sample resistance2；
S3: the phase delta θ of super capacitor output voltage is calculated using fft algorithm；
S4: the current value I on sample resistance is obtained；
S5: according to formulaObtain the internal resistance value of super capacitor.
As a further improvement of the present invention: the step S1 includes:
S01: inputting sinusoidal signal U to super capacitor and sample resistance, and sinusoidal signal U is carried out V/I conversion, obtains electric current
Signal；
S02: amplification current signal is simultaneously filtered, and obtains constant current.
As a further improvement of the present invention: specific steps in the step S3 are as follows: right using the property of twiddle factor
DFT algorithm is further analyzed, and is obtained:
The corresponding frequency point number of target frequency are as follows:Wherein, Fs is the sample frequency of system, and N is sampled point
Number, Fn are the frequency of echo signal, and n is the nth point of sample sequence, the phase of frequency point are as follows:And Δ
θ=θn。
As a further improvement of the present invention: further including step S001 before the step S1: by super capacitor and sampling
Resistance series connection.
Second aspect of the present invention provides a kind of super capacitor internal resistance measurement device, and described device includes:
Alternating voltage source module, for providing sinusoidal signal U to super capacitor and sampling capacitor；
V-I conversion module obtains electric current letter for alternating voltage source module input sinusoidal signal U to be carried out V/I conversion
Number；
Conditioning module obtains constant current for amplifying current signal and filtering processing；
A/D acquisition module, for acquiring the output voltage U of super capacitor1With the output voltage U of sample resistance2；
Processor, for obtaining the electric current I for flowing through sample resistance, to the output voltage U of super capacitor1FFT calculating is carried out,
Obtain the internal resistance value of super capacitor；
The alternating voltage source module is in parallel with V-I conversion module, and conditioning module is connect with A/D acquisition module, A/D acquisition
Module is connect with processor.
As a further improvement of the present invention: the conditioning module includes AC differential amplifying unit and low-pass filtering list
Member, the AC differential amplifying unit are used to believe amplified electric current for amplifying current signal, the low-pass filter unit
It number is filtered.
As a further improvement of the present invention: further including display module, the display module is for showing super capacitor
Internal resistance value.
Third aspect present invention provides a kind of computer readable storage medium, and the computer readable storage medium is used for
Program code is stored, said program code is for executing method described in first aspect.
Compared with the prior art, the advantages of the present invention are as follows:
Super capacitor internal resistance measuring method of the invention calculates the phase delta of super capacitor output voltage using fft algorithm
θ can be according to formula by obtaining the current value I on sample resistanceObtain the internal resistance value of super capacitor.
Since fft algorithm is utilized, entire test process is simplified, the accuracy of internal resistance detection is improved, using based on fft algorithm
The repeatability error of super capacitor internal resistance detection device is able to satisfy the requirement for meeting super capacitor detection no more than 3%.
Detailed description of the invention
Fig. 1 is the flow diagram of super capacitor internal resistance measuring method in a particular embodiment of the invention.
Fig. 2 is the structural schematic diagram of super capacitor internal resistance measurement device in a particular embodiment of the invention.
Specific embodiment
The present invention is described in further details below with reference to Figure of description and specific embodiment.
As shown in Figure 1 to Figure 2, the invention discloses a kind of super capacitor internal resistance measuring method, step includes:
S1: sinusoidal signal U is inputted to super capacitor and sample resistance；
S2: the voltage U of super capacitor is acquired1With the voltage U of sample resistance2；
S3: super capacitor output voltage U is calculated using fft algorithm1Phase delta θ；
S4: the current value I on sample resistance is obtained.
S5: according to formulaObtain the internal resistance value of super capacitor.
The present embodiment acquires the output voltage of super capacitor by inputting sinusoidal signal U to super capacitor and sample resistance
U1With the output voltage U of sample resistance2, super capacitor output voltage U is calculated using fft algorithm1Phase delta θ, obtain sampling electricity
Current value I in resistance, can be according to formulaCalculate the internal resistance value of super capacitor.It is calculated since FFT is utilized
Method simplifies entire test process, improves the accuracy of internal resistance detection, is examined using the super capacitor internal resistance based on fft algorithm
The repeatability error for surveying device is able to satisfy the requirement for meeting super capacitor detection no more than 3%.
In the preferred embodiment, step S1 includes: S01: sinusoidal signal U is inputted to super capacitor and sample resistance, it will just
String signal U carries out V/I conversion, obtains current signal.By the way that sinusoidal signal U is carried out V/I conversion, constant current is obtained, it is ensured that
Super capacitor and sample resistance both ends output voltage stabilization.
As preferably embodiment, specific steps in step S4 are as follows: fft algorithm is utilized to calculate super capacitor output voltage
The specific steps of phase delta θ are as follows: using the property of twiddle factor, DFT algorithm is further analyzed, is obtained:
The corresponding frequency point number of target frequency are as follows:Wherein, Fs is the sample frequency of system, and N is sampled point
Number, Fn are the frequency of echo signal, and n is the nth point of sample sequence, the phase of frequency point are as follows:And Δ
θ=θn.It should be noted that being not limited to the calculating of the present embodiment using fft algorithm the above are presently preferred embodiments of the present invention
Method or step obtains other calculation methods of super capacitor internal resistance value using fft algorithm or step also should belong to guarantor of the present invention
Protect range.
Further include step S001 before the step S1 in the present embodiment: super capacitor and sample resistance are connected.
The present embodiment realizes the detailed process of super capacitor internal resistance measurement are as follows:
Super capacitor and sample resistance are connected first, then input sinusoidal signal U, example to super capacitor and sampling capacitor
The sine wave for such as inputting 1KHz is converted by V-I and carries out V/I conversion, and current signal is obtained, and then amplifies current signal and carries out
Filtering processing obtains constant current；Acquire the output voltage U of super capacitor1With the output voltage U of sample resistance2；And to super
The output voltage U of capacitor1FFT calculating is carried out, the real and imaginary parts of corresponding frequency point is sought, finds out phase using arctan function,
If sample frequency is 10KHz, sampling number 1000, target frequency 1KHz, then the corresponding frequency point number of 1KHz is n=101, then
The phase of the frequency point are as follows:The current value I on sample resistance is obtained, following formula is then passed through:The internal resistance value for obtaining super capacitor, then shows measurement result by display screen.
The present embodiment additionally provides a kind of super capacitor internal resistance detection device, comprising:
Alternating voltage source module, for providing sinusoidal signal U；
V-I conversion module obtains electric current letter for alternating voltage source module input sinusoidal signal U to be carried out V/I conversion
Number；
Conditioning module obtains constant current for amplifying current signal and being filtered；
A/D acquisition module, for acquiring the output voltage U of super capacitor1With the output voltage U of sample resistance2；
Processor carries out FFT calculating to the output voltage of super capacitor, obtains for obtaining the electric current I for flowing through sample resistance
Take the internal resistance value of super capacitor；
The alternating voltage source module is in parallel with V-I conversion module, and conditioning module is connect with A/D acquisition module, A/D acquisition
Module is connect with processor.
Super capacitor internal resistance is measured using the super capacitor internal resistance detection device in the present embodiment, passes through alternating current
Potential source module provides sinusoidal signal U, as the input signal of V-I conversion module, completes V/I conversion by V-I conversion module, obtains
Current signal is obtained, conditioning module completes current signal amplification and filtering processing, keeps electric current constant；It is acquired by A/D acquisition module
The output voltage U of super capacitor1With the output voltage U of sample resistance2；Processor obtains the electric current I for flowing through sample resistance, and right
The output voltage of super capacitor carries out FFT calculating, obtains the internal resistance of the phase delta θ and super capacitor of the voltage of super capacitor output
Value.Super capacitor internal resistance detection device based on fft algorithm is measured super capacitor internal resistance, is able to satisfy repeatability and does not surpass
3% is crossed, the requirement of super capacitor internal resistance detection is met.
In the present embodiment, conditioning module includes AC differential amplifying unit and low-pass filter unit, and AC differential amplification is single
Member obtains constant electricity for being filtered to amplified current signal for amplifying current signal, low-pass filter unit
Stream.Since the internal resistance value of super capacitor is several milliohms, the value of U is usually mV grades, therefore passes through AC differential amplifying unit
Amplify current signal, can prevent because of weak output signal, the problem of when measurement is flooded by noise；By low-pass filter unit to amplification after
Signal be filtered, the interference of high fdrequency component can be eliminated, improve the accuracy of test result.
It further include display module in the present embodiment, display module is used to show the internal resistance value of super capacitor, by showing mould
Block can intuitively show the internal resistance value of the super capacitor detected.
It selects the super capacitor of two kinds of specifications as tested sample is tested, uses the super capacitor internal resistance in the present embodiment
Detection device measures the internal resistance value of super capacitor, the arithmetic mean of instantaneous value of measurement dataWith standard deviation δ (x) are as follows:
In formula, n is pendulous frequency, and n=12.
Experiment 1: Nippon Chemi-Con (English is abbreviated as NCC) super capacitor is selected to be detected, the super capacitor
Production model be DDLE2R5LGN701KAA5, voltage rating 2.5V, capacity 700F, under normal temperature condition, in super capacitor is specified
Hinder 4m Ω.12 detections are carried out to this super capacitor, reperformance test experimental data is as shown in table 1.
1 700F super capacitor reperformance test data of table
The super capacitor internal resistance value and above-mentioned arithmetic mean of instantaneous value surveyed according to table 1With standard deviation δ (x) formula, Ji Keji
The average value for calculating super capacitor internal resistance value is 4.093m Ω, repeatability error 2.5%.
Experiment 2: selecting the super capacitor of QINFEN production to be detected, and the voltage rating of the super capacitor is 2.7V, holds
Measuring is 3000F, and under normal temperature condition, the specified internal resistance of the capacitor is 0.65m Ω.12 detections, repeatability are carried out to this super capacitor
Test experiments data are as shown in table 2.
2 3000F super capacitor reperformance test data of table
The super capacitor internal resistance value and above-mentioned arithmetic mean of instantaneous value surveyed according to table 2With standard deviation δ (x) formula, Ji Keji
Calculating super capacitor internal resistance average value is 0.632m Ω, repeatability error 3.0%.
It can be seen that the accuracy of measuring method and test device provided by the present embodiment is high and stablizes, it can be suitably used for different factories
The super capacitor test of family, applicability are wide.
The present embodiment additionally provides a kind of computer readable storage medium, and computer readable storage medium is for storing program
Code, program code are used to execute the measuring method of any one super capacitor internal resistance above-mentioned.
The above is only the preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-described embodiment,
All technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art
For those of ordinary skill, several improvements and modifications without departing from the principles of the present invention should be regarded as protection of the invention
Range.
Claims (8)
1. a kind of super capacitor internal resistance measuring method, which is characterized in that step includes:
S1: sinusoidal signal U is inputted to super capacitor and sample resistance；
S2: the output voltage U of super capacitor is acquired1With the output voltage U of sample resistance2；
S3: super capacitor output voltage U is calculated using fft algorithm1Phase delta θ；
S4: the current value I on sample resistance is obtained；
S5: according to formulaObtain the internal resistance value of super capacitor.
2. super capacitor internal resistance measuring method according to claim 1, which is characterized in that the step S1 includes:
S01: inputting sinusoidal signal U to super capacitor and sample resistance, and sinusoidal signal U is carried out V/I conversion, obtains electric current letter
Number；
S02: amplification current signal is simultaneously filtered, and obtains constant current.
3. super capacitor internal resistance measuring method according to claim 1, which is characterized in that specific steps in the step S3
Are as follows: using the property of twiddle factor, DFT algorithm is further analyzed, is obtained:
The corresponding frequency point number of target frequency are as follows:Wherein, Fs is the sample frequency of system, and N is sampling number, Fn
For the frequency of echo signal, n is the nth point of sample sequence, the phase of frequency point are as follows:And Δ θ=θn。
4. super capacitor internal resistance measuring method according to claim 1, which is characterized in that further include before the step S1
Step S001: super capacitor and sample resistance are connected.
5. a kind of super capacitor internal resistance detection device characterized by comprising
Alternating voltage source module, for providing sinusoidal signal U to super capacitor and sample resistance；
V-I conversion module obtains current signal for alternating voltage source module input sinusoidal signal U to be carried out V/I conversion；
Conditioning module obtains constant current for amplifying current signal and filtering processing；
A/D acquisition module, for acquiring the output voltage U of super capacitor1With the output voltage U of sample resistance2；
Processor, for obtaining the electric current I for flowing through sample resistance, to the output voltage U of super capacitor1FFT calculating is carried out, is obtained
The internal resistance value of super capacitor；
The alternating voltage source module is in parallel with V-I conversion module, and conditioning module is connect with A/D acquisition module, A/D acquisition module
It is connect with processor.
6. super capacitor internal resistance detection device according to claim 5, which is characterized in that the conditioning module includes exchange
Differential amplification unit and low-pass filter unit, the AC differential amplifying unit is for amplifying current signal, the low-pass filtering
Unit is for being filtered amplified current signal.
7. super capacitor internal resistance detection device according to claim 5, which is characterized in that it further include display module, it is described
Display module is used to show the internal resistance value of super capacitor.
8. a kind of computer readable storage medium, which is characterized in that the computer readable storage medium is for storing program generation
Code, said program code require the measuring method of super capacitor internal resistance described in 1 to 4 any one for perform claim.
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| CN109709399A (en) * | 2018-12-07 | 2019-05-03 | 玉溪师范学院 | Supercapacitor internal resistance detection device, method and computer readable storage medium |
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| CN1818684A (en) * | 2006-03-03 | 2006-08-16 | 广东省电子技术研究所 | Method and device for measuring battery internal resistance |
| CN101685117A (en) * | 2009-07-20 | 2010-03-31 | 南京航空航天大学 | Internal resistance measuring method for storage battery |
| CN102466766A (en) * | 2010-10-28 | 2012-05-23 | Nxp股份有限公司 | Spectroscopic battery-cell-impedance measurement arrangement |
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