CN110333416A - A kind of high-voltage electrolytic capacitor durability testing system and method - Google Patents
A kind of high-voltage electrolytic capacitor durability testing system and method Download PDFInfo
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- CN110333416A CN110333416A CN201910723452.5A CN201910723452A CN110333416A CN 110333416 A CN110333416 A CN 110333416A CN 201910723452 A CN201910723452 A CN 201910723452A CN 110333416 A CN110333416 A CN 110333416A
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- 239000003990 capacitor Substances 0.000 title claims abstract description 139
- 238000012360 testing method Methods 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title description 6
- 238000004146 energy storage Methods 0.000 claims abstract description 20
- 239000012536 storage buffer Substances 0.000 claims abstract description 20
- 238000001514 detection method Methods 0.000 claims abstract description 19
- 238000007599 discharging Methods 0.000 claims description 14
- 230000005611 electricity Effects 0.000 claims description 13
- 238000005868 electrolysis reaction Methods 0.000 claims description 8
- 238000010998 test method Methods 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- 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
- G01R31/003—Environmental or reliability tests
-
- 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
- G01R31/01—Subjecting similar articles in turn to test, e.g. "go/no-go" tests in mass production; Testing objects at points as they pass through a testing station
- G01R31/013—Testing passive components
- G01R31/016—Testing of capacitors
Abstract
The invention belongs to electrolytic capacitor durability test technical fields, a kind of high-voltage electrolytic capacitor durability testing system, including DC power source unit, energy storage buffer capacitor, control circuit unit, charge switch, parameter setting unit, detection circuit unit, discharge switch, electrolytic capacitor to be measured, first resistor and second resistance are provided；Charging peaks electric current is adjusted by setting first resistor, discharge peak currents are adjusted by setting second resistance, it is in parallel with DC power source unit by setting energy storage buffer capacitor, DC power source unit internal resistance is reduced by energy storage buffer capacitor, enough electric currents are provided for electrolytic capacitor to be measured charging, charge switch is controlled by setting parameter setting unit and discharge switch connects frequency, to solve at present in the big ripple charge and discharge durability test of electrolytic capacitor, the ripple current waveform that traditional instrument generates is not inconsistent with practical application and frequency is fixed, the problem of can not adjusting.
Description
Technical field
The invention belongs to electrolytic capacitor durability test technical fields, and in particular to a kind of high-voltage electrolytic capacitor durability survey
Test system and method.
Background technique
Electrolytic capacitor is one kind of capacitor, and metal foil is anode, and being close to the oxidation film of metal with anode is dielectric, cathode
It is collectively constituted by conductive material, electrolyte and other materials, because electrolyte is the major part of cathode, therefore electrolytic capacitor obtains
Name.
Currently, being to the technical principle of the instrument of resistance to ripple test of electrolytic capacitor: applying a Constant Direct Current to electrolytic capacitor
It is superimposed the sinusoidal ac of 120Hz or 100KHz on the basis of voltage, generates a pulsating dc voltage, by adjusting output exchange
The electric current of electricity examines electrolytic capacitor so that the peak value of pulsating volage is not more than the voltage rating of electrolytic capacitor with this condition
The performances such as temperature rise and service life.
The alternating current that traditional instrument generates is continuous sine wave, and peak value is 1.414 times of virtual value, however, electrolysis electricity
The ripple current harmonic components held in practical applications are very high, show interrupted pulse sharp wave, peak point current and virtual value
The ratio between electric current is significantly larger than 1.414, moreover, the frequency for the ripple current that traditional instrument generates is fixed 120Hz, is not adjustable,
It is unable to satisfy the more low-frequency ripple current durability simulation test of industrial frequency transformer.
Summary of the invention
The invention reside in a kind of high-voltage electrolytic capacitor durability testing system and method is provided, to solve at present to electrolysis electricity
In the big ripple charge and discharge durability test held, the ripple current waveform and practical application that traditional instrument generates are not inconsistent and frequency is solid
It is fixed, the problem of can not adjusting.
The invention is realized in this way the present invention provides a kind of high-voltage electrolytic capacitor durability testing system, including direct current
Power supply unit, energy storage buffer capacitor, control circuit unit, charge switch, parameter setting unit, detection circuit unit, electric discharge are opened
Pass, electrolytic capacitor to be measured, first resistor and second resistance,
Wherein, the energy storage buffer capacitor is in parallel with DC power source unit, and the electrolytic capacitor to be measured, fills at first resistor
Electric switch and energy storage buffer capacitor are sequentially connected in series into a closed circuit,
The electrolytic capacitor to be measured, second resistance and discharge switch are sequentially connected in series to form another closed circuit
The charge switch, discharge switch, parameter setting unit and detection circuit unit respectively with control circuit unit
Series connection.
Preferably, the first resistor is connected with charge switch, and the first resistor is connected with electrolytic capacitor to be measured, described
First resistor is for adjusting charging peaks electric current.
Preferably, the adjusting formula of the charging peaks electric current are as follows:
Wherein, U0For the voltage rating of electrolytic capacitor to be measured, the U1For the charging initial voltage of electrolytic capacitor to be measured, R1
For the resistance value of first resistor.
Preferably, the second resistance is connected with discharge switch, and the second resistance and electrolytic capacitor to be measured pass through electric discharge
Switch series connection, the second resistance is for adjusting discharge peak currents.
Preferably, the adjusting formula of the discharge peak currents are as follows:
Wherein, U01For the voltage rating of electrolytic capacitor to be measured, R2 is the resistance value of second resistance.
Preferably, the first resistor and second resistance are power resistor.
Preferably, the parameter setting unit is connected with control circuit unit, and the parameter setting unit is filled for controlling
Electric switch and discharge switch make-and-break time, that is, electrolytic capacitor to be measured ripple current frequencies, the parameter setting unit is for setting
The end of charge voltage of the final discharging voltage of electrolytic capacitor to be measured and electrolytic capacitor to be measured.
A kind of high-voltage electrolytic capacitor durability test method, it is characterised in that: the following steps are included:
Step S1: setting the final discharging voltage and end of charge voltage of electrolytic capacitor by parameter setting unit, and
Charge switch and discharge switch make-and-break time,
Step S2: when the conducting of control circuit unit control discharge switch and charge switch disconnect in step S1, electricity to be measured
Solution capacitor is discharged by second resistance,
Step S3: when the discharge operation that detection circuit unit detects that electrolytic capacitor to be measured carries out reaches parameter in step S1
When the final discharging voltage of the electrolytic capacitor to be measured of setup unit setting, control circuit unit sends signal and stops electric discharge,
Step S4: when the conducting of control circuit unit control charge switch and discharge switch disconnect in step S1, direct current
Source unit is the end of charge voltage that electrolytic capacitor to be measured charge to parameter setting unit setting.
Preferably, the charge switch and discharge switch are used for electrolytic capacitor to be measured lower than 100Hz low-frequency test.
Preferably, the control circuit unit uses PLC single-chip microcontroller.
Compared with prior art, the beneficial effects of the present invention are: adjusting charging peaks electric current by setting first resistor,
Discharge peak currents are adjusted by setting second resistance, it is in parallel with DC power source unit by setting energy storage buffer capacitor, pass through
Energy storage buffer capacitor reduces DC power source unit internal resistance, enough electric currents is provided for electrolytic capacitor to be measured charging, by the way that parameter is arranged
Setup unit controls charge switch and discharge switch make-and-break time, that is, electrolytic capacitor to be measured ripple current frequencies, is set by parameter
Order member is used to set the final discharging voltage of electrolytic capacitor to be measured and the end of charge voltage of electrolytic capacitor to be measured, to solve
At present to the ripple current waveform and practical application that in the big ripple charge and discharge durability test of electrolytic capacitor, traditional instrument is generated
Not the problem of not being inconsistent, and frequency is fixed, can not adjusting.
Detailed description of the invention
Fig. 1 is system structure diagram of the invention；
Fig. 2 is step flow diagram of the invention；
1- DC power source unit, 2- energy storage buffer capacitor, 3- control circuit unit, 4- charge switch, 5- parameter setting list
Member, 6- detection circuit unit, 7- discharge switch, 8- electrolytic capacitor to be measured, 9- first resistor, 10- second resistance.
Specific embodiment
Below in conjunction with the attached drawing in inventive embodiments, the technical method in inventive embodiments is carried out clearly and completely
Description, it is clear that described embodiment is only invention a part of the embodiment, instead of all the embodiments.Based in invention
Embodiment, every other embodiment obtained by those of ordinary skill in the art without making creative efforts,
Belong to the range of invention protection.
The present invention provides a kind of high-voltage electrolytic capacitor durability testing system, including DC power source unit referring to FIG. 1-2,
1, energy storage buffer capacitor 2, control circuit unit 3, charge switch 4, parameter setting unit 5, detection circuit unit 6, discharge switch
7, electrolytic capacitor 8 to be measured, first resistor 9 and second resistance 10,
Wherein, the energy storage buffer capacitor 2 is in parallel with DC power source unit 1, the electrolytic capacitor 8 to be measured, first resistor
9, charge switch 4 and energy storage buffer capacitor 2 are sequentially connected in series into a closed circuit,
The electrolytic capacitor to be measured 8, second resistance 10 and discharge switch 7 are sequentially connected in series to form another closed circuit
The charge switch 4, discharge switch 7, parameter setting unit 5 and detection circuit unit 6 respectively with control circuit
Unit 3 is connected.
In the present embodiment, the energy storage buffer capacitor 2 is in parallel with DC power source unit 1, the charge switch 4 and control
Circuit unit 3 processed is connected, and the control circuit unit 3 is connected with detection circuit unit 6, the detection circuit unit 6 with it is to be measured
Electrolytic capacitor 8 is in parallel, and the discharge switch 7 is connected into closed circuit by second resistance 10 and electrolytic capacitor 8 to be measured, described to put
Electric switch 7 is connected with control circuit unit 3, is electrolytic capacitor 8 to be measured charging, DC power supply by setting DC power source unit 1
Unit 1 is that electrolytic capacitor to be measured conveys DC voltage, reduces by 1 internal resistance of DC power source unit by setting energy storage buffer capacitor 2, protects
Voltage when card DC power source unit 1 charges to electrolytic capacitor 8 to be measured is not reduced significantly, prevent supply voltage not enough and influence to
Survey electrolytic capacitor ripple test effect.
Further, the first resistor (9) is connected with charge switch (4), the first resistor (9) and electrolysis to be measured electricity
Hold (8) series connection, the first resistor (9) is for adjusting charging peaks electric current.
Further, the adjusting formula of the charging peaks electric current are as follows:
Wherein, U0For the voltage rating of electrolytic capacitor 8 to be measured, the U1For the charging initial voltage of electrolytic capacitor 8 to be measured,
R1 is the resistance value of first resistor 9.
In the present embodiment, the first resistor 9 is connected with charge switch 4, the first resistor 9 and electrolysis electricity to be measured
Hold 8 series connection, the first resistor 9 is in parallel with detection circuit unit 6, and the first resistor 9 passes through the adjusting of charging peaks electric current
Formula adjusts charging peaks electric current, and when control circuit unit 3 sends charging signals, charge switch 4 is closed, and discharge switch 7 is disconnected
It opens, DC power source unit 1 is electrolysis to be measured by first resistor 9 by charge switch 4 after the buffering of energy storage buffer capacitor 2
Capacitor 8 charges, and adjusts DC power source unit 1 by first resistor 9 and is input to the charging peaks electric current in electrolytic capacitor 8 to be measured.
Further, the second resistance 10 is connected with discharge switch 7, the second resistance 10 and electrolytic capacitor 8 to be measured
It is connected by discharge switch 7, the second resistance 10 is for adjusting discharge peak currents.
Further, the adjusting formula of the discharge peak currents are as follows:
Wherein, U01For the voltage rating of electrolytic capacitor 8 to be measured, R2 is the resistance value of second resistance 10.
In the present embodiment, the second resistance 10 is connected with charge switch 4, the second resistance 10 and electrolysis to be measured
Capacitor 8 is connected, and the second resistance 10 is in parallel with detection circuit unit 6, and the second resistance 10 passes through discharge peak currents tune
It saves formula and adjusts discharge peak currents, when control circuit unit sends discharge signal, discharge switch 7 is closed, and charge switch 4 is disconnected
It opens, electrolytic capacitor 8 to be measured discharges by second resistance 10, adjusts the discharge peak in electrolytic capacitor 8 to be measured by second resistance 10
It is worth electric current.
Further, the first resistor 9 and second resistance 10 are power resistor.
It in the present embodiment, is power resistor, power resistor power consumption by setting first resistor 9 and second resistance 10
Greatly, charging peaks electric current and discharge peak currents, first electricity are adjusted by setting first resistor 9 and second resistance 10 respectively
Resistance 9 is connected with charge switch 4, and the first resistor 9 is connected with electrolytic capacitor 8 to be measured, the first resistor 9 and detection circuit list
Member 6 is in parallel, and the first resistor 9 is closed for adjusting charging peaks electric current, charge switch 4, when discharge switch 7 disconnects, power supply
By charge switch 4, then flow to first resistor 9, for electrolytic capacitor 8 to be measured charge, by be arranged second resistance 10, described second
Resistance 10 is connected with electrolytic capacitor 8 to be measured, and the second resistance 10 is in parallel with detection circuit unit 6, and discharge switch 7 is closed, and is filled
Electric switch 4 is opened, and electrolytic capacitor 8 to be measured passes through discharge switch 7, then flows to the electric discharge of second resistance 10,
Further, the parameter setting unit 5 is connected with control circuit unit 3, and the parameter setting unit 5 is for setting
Set the ripple current frequencies of charge switch 4 Yu 7 make-and-break time of discharge switch electrolytic capacitor 8 i.e. to be measured, the parameter setting unit 5
For setting the final discharging voltage of electrolytic capacitor 8 to be measured and the end of charge voltage of electrolytic capacitor to be measured 8.
In the present embodiment, the parameter setting unit 5 is connected with control circuit unit 3, the parameter setting unit 5
For the ripple current frequencies of charge switch 4 Yu 7 make-and-break time of discharge switch electrolytic capacitor i.e. to be measured, the parameter setting to be arranged
Unit 5 is used to set the final discharging voltage of electrolytic capacitor 8 to be measured and the end of charge voltage of electrolytic capacitor to be measured 8, by setting
It sets parameter setting unit 5 and has solved the ripple current that the big ripple charge and discharge durability test instrument of traditional electrolytic capacitor generates
Waveform is not inconsistent with practical application, and frequency is fixed 120Hz, is not adjustable, and it is more low-frequency to be unable to satisfy industrial frequency transformer use
The problem of ripple current durability simulation test.
In the present embodiment, control circuit unit 3 issues charging signals, and charge switch 4 is closed, and discharge switch 7 disconnects,
DC power source unit 1 is buffered through energy storage buffer capacitor 2, by charge switch 4, by first resistor 9, for electrolytic capacitor 8 to be measured
8 end of charge voltage of electrolytic capacitor to be measured for charging to the setting of parameter setting unit 5, the charging for completing electrolytic capacitor 8 to be measured are surveyed
Examination, then, control circuit unit 3 issue discharge signal, and charge switch 4 disconnects, and discharge switch 7 is closed, and control electrolysis electricity to be measured
Hold by discharge switch 7, discharge by second resistance 10, is set when detection circuit unit 6 detects electrolytic capacitor 8 to be measured and is discharged to parameter
When the final discharging voltage of 5 setting of order member, control circuit unit 3, which issues signal control discharge switch and disconnects, stops electric discharge, complete
At the discharge test of electrolytic capacitor 8 to be measured.Repeatedly.
A kind of high-voltage electrolytic capacitor durability test method, comprising the following steps:
Step S1: setting the final discharging voltage and end of charge voltage of electrolytic capacitor 8 by parameter setting unit 5, with
And 7 make-and-break time of charge switch 4 and discharge switch,
Step S2: to be measured when control circuit unit 3 controls the conducting of discharge switch 7 and the disconnection of charge switch 4 in step S1
Electrolytic capacitor 8 is discharged by second resistance,
Step S3: join when detection circuit unit 6 detects that the discharge operation that electrolytic capacitor 8 to be measured carries out reaches in step S1
When the final discharging voltage for the electrolytic capacitor to be measured 8 that number setup unit 5 is set, control circuit unit 3 sends signal and stops electric discharge,
Step S4: when control circuit unit 3 controls the conducting of charge switch 4 and the disconnection of discharge switch 7 in step S1, direct current
Power supply unit 1 is the end of charge voltage that electrolytic capacitor 8 to be measured charge to the setting of parameter setting unit 5.
In the present embodiment, control circuit unit 3 issues charging signals, and charge switch 4 is closed, and discharge switch 7 disconnects,
DC power source unit 1 is buffered through energy storage buffer capacitor 2, by charge switch 4, by first resistor 9, for electrolytic capacitor 8 to be measured
8 end of charge voltage of electrolytic capacitor to be measured for charging to the setting of parameter setting unit 5, the charging for completing electrolytic capacitor 8 to be measured are surveyed
Examination, then, control circuit unit 3 issue discharge signal, and charge switch 4 disconnects, and discharge switch 7 is closed, and electrolytic capacitor 8 to be measured is logical
Over-discharge electric switch 7, by second resistance 10, electric discharge is set when detection circuit unit 6 detects electrolytic capacitor 8 to be measured and is discharged to parameter
When the final discharging voltage of 5 setting of order member, control circuit unit 3 issues signal control DC power source unit 1 and stops electric discharge, complete
At the discharge test of electrolytic capacitor 8 to be measured.Repeatedly.
Further, the charge switch 4 is lower than 100Hz low-frequency test for electrolytic capacitor 8 to be measured with discharge switch 7.
Further, the control circuit unit 3 uses PLC single-chip microcontroller.
In in the present embodiment, described control unit 3 uses PLC single-chip microcontroller, and PLC single-chip microcontroller has stronger general
Property, applicability is wide, and controlling DC power source unit 1 by setting control unit 3 carries out charging and discharging to electrolytic capacitor to be measured, thus
Realize the durability test to electrolytic capacitor 8 to be measured.
While there has been shown and described that the embodiment invented, for the ordinary skill in the art, Ke Yili
Solution can carry out a variety of variations, modification, replacement to these embodiments in the case where not departing from the principle and spirit of invention and become
The range of type, invention is defined by the appended claims and the equivalents thereof.
Claims (10)
1. a kind of high-voltage electrolytic capacitor durability testing system, it is characterised in that: including DC power source unit (1), energy storage buffer
Capacitor (2), control circuit unit (3), charge switch (4), parameter setting unit (5), detection circuit unit (6), discharge switch
(7), electrolytic capacitor (8) to be measured, first resistor (9) and second resistance (10),
Wherein, the energy storage buffer capacitor (2) is in parallel with DC power source unit (1), the electrolytic capacitor (8) to be measured, the first electricity
Resistance (9), charge switch (4) and energy storage buffer capacitor (2) are sequentially connected in series into a closed circuit,
The electrolytic capacitor to be measured (8), second resistance (10) and discharge switch (7) are sequentially connected in series to form another closed circuit
The charge switch (4), discharge switch (7), parameter setting unit (5) and detection circuit unit (6) respectively with control
Circuit unit (3) series connection.
2. a kind of high-voltage electrolytic capacitor durability testing system according to claim 1, it is characterised in that: first electricity
Resistance (9) is connected with charge switch (4), and the first resistor (9) is connected with electrolytic capacitor to be measured (8), and the first resistor (9) is used
In adjusting charging peaks electric current.
3. a kind of high-voltage electrolytic capacitor durability testing system according to claim 2, it is characterised in that: the charging peak
It is worth the adjusting formula of electric current are as follows:
Wherein, U0For the voltage rating of electrolytic capacitor to be measured (8), the U1For the charging initial voltage of electrolytic capacitor to be measured (8),
R1 is the resistance value of first resistor (9).
4. a kind of high-voltage electrolytic capacitor durability testing system according to claim 3, it is characterised in that: second electricity
Resistance (10) is connected with discharge switch (7), and the second resistance (10) is connected with electrolytic capacitor to be measured (8) by discharge switch (7),
The second resistance (10) is for adjusting discharge peak currents.
5. a kind of high-voltage electrolytic capacitor durability testing system according to claim 4, it is characterised in that: the discharge peak
It is worth the adjusting formula of electric current are as follows:
Wherein, U01For the voltage rating of electrolytic capacitor to be measured (8), R2 is the resistance value of second resistance (10).
6. a kind of high-voltage electrolytic capacitor durability testing system according to claim 5, it is characterised in that: first electricity
Hindering (9) and second resistance (10) is power resistor.
7. a kind of high-voltage electrolytic capacitor durability testing system according to claim 6, it is characterised in that: the parameter is set
Order member (5) is connected with control circuit unit (3), and the parameter setting unit (5) is opened for controlling charge switch (4) with electric discharge
(7) make-and-break time, that is, electrolytic capacitor to be measured ripple current frequencies are closed, the parameter setting unit (5) is for setting electrolysis to be measured
The final discharging voltage of capacitor (8) and the end of charge voltage of electrolytic capacitor to be measured (8).
8. a kind of high-voltage electrolytic capacitor durability test method, it is characterised in that: the following steps are included:
Step S1: setting the final discharging voltage and end of charge voltage of electrolytic capacitor (8) by parameter setting unit (5), with
And charge switch (4) and discharge switch (7) make-and-break time,
Step S2: when control circuit unit (3) control discharge switch (7) conducting and charge switch (4) disconnect in step S1, to
Electrolytic capacitor (8) are surveyed to discharge by second resistance,
Step S3: join when detection circuit unit (6) detects that the discharge operation that electrolytic capacitor to be measured (8) carry out reaches in step S1
When the final discharging voltage of the electrolytic capacitor to be measured (8) of number setup unit (5) setting, control circuit unit (3) sends signal and stops
Only discharge,
Step S4: when control circuit unit (3) control charge switch (4) conducting and discharge switch (7) disconnect in step S1, directly
Galvanic electricity source unit (1) is the end of charge voltage that electrolytic capacitor to be measured (8) charge to parameter setting unit (5) setting.
9. a kind of high-voltage electrolytic capacitor durability test method according to claim 8, it is characterised in that: the charging is opened
It closes (4) and discharge switch (7) and is lower than 100Hz low-frequency test for electrolytic capacitor to be measured (8).
10. a kind of high-voltage electrolytic capacitor durability test method according to claim 8, it is characterised in that: the control
Circuit unit (3) uses PLC single-chip microcontroller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910723452.5A CN110333416A (en) | 2019-08-07 | 2019-08-07 | A kind of high-voltage electrolytic capacitor durability testing system and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910723452.5A CN110333416A (en) | 2019-08-07 | 2019-08-07 | A kind of high-voltage electrolytic capacitor durability testing system and method |
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| CN110333416A true CN110333416A (en) | 2019-10-15 |
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Cited By (3)
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| CN111337741A (en) * | 2020-04-17 | 2020-06-26 | 常州华威电子有限公司 | Automatic test recorder for leakage current of electrolytic capacitor |
| 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 |
| CN113358955A (en) * | 2021-06-02 | 2021-09-07 | 格力电器（合肥）有限公司 | Method for detecting reliability of electrolytic capacitor |
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Inventor after: Yan Hanjing Inventor after: Yang Hongzhen Inventor after: Zhou Jiabing Inventor before: Yan Hanjing Inventor before: Yang Hongzhen Inventor before: Zhou Jiabing |