CN115274303B - Aging method and aging circuit for aluminum electrolytic capacitor and aluminum electrolytic capacitor - Google Patents
Aging method and aging circuit for aluminum electrolytic capacitor and aluminum electrolytic capacitor Download PDFInfo
- Publication number
- CN115274303B CN115274303B CN202211047838.7A CN202211047838A CN115274303B CN 115274303 B CN115274303 B CN 115274303B CN 202211047838 A CN202211047838 A CN 202211047838A CN 115274303 B CN115274303 B CN 115274303B
- Authority
- CN
- China
- Prior art keywords
- voltage
- aging
- electrolytic capacitor
- aluminum electrolytic
- charging
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000032683 aging Effects 0.000 title claims abstract description 208
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 171
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 171
- 239000003990 capacitor Substances 0.000 title claims abstract description 144
- 238000000034 method Methods 0.000 title claims abstract description 50
- 238000007599 discharging Methods 0.000 claims abstract description 32
- 239000011888 foil Substances 0.000 claims description 36
- 230000002457 bidirectional effect Effects 0.000 claims description 14
- 230000015572 biosynthetic process Effects 0.000 claims description 13
- 239000003792 electrolyte Substances 0.000 claims description 8
- 230000000087 stabilizing effect Effects 0.000 claims description 5
- 230000002431 foraging effect Effects 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 150000003863 ammonium salts Chemical class 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims description 2
- 239000000835 fiber Substances 0.000 claims description 2
- 239000002086 nanomaterial Substances 0.000 claims description 2
- 230000003679 aging effect Effects 0.000 abstract description 5
- 230000000630 rising effect Effects 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000004880 explosion Methods 0.000 description 3
- 230000002829 reductive effect Effects 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000000670 limiting effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/0029—Processes of manufacture
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/004—Details
- H01G9/04—Electrodes or formation of dielectric layers thereon
- H01G9/042—Electrodes or formation of dielectric layers thereon characterised by the material
- H01G9/045—Electrodes or formation of dielectric layers thereon characterised by the material based on aluminium
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/145—Liquid electrolytic capacitors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/12—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for removing insulation or armouring from cables, e.g. from the end thereof
- H02G1/1202—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for removing insulation or armouring from cables, e.g. from the end thereof by cutting and withdrawing insulation
- H02G1/1248—Machines
- H02G1/1251—Machines the cutting element not rotating about the wire or cable
- H02G1/1263—Machines the cutting element not rotating about the wire or cable making a transverse and longitudinal cut
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/007188—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters
- H02J7/007192—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
Abstract
The invention provides an aging method, an aging circuit and an aluminum electrolytic capacitor of an aluminum electrolytic capacitor, wherein the method comprises the following steps: the first aging stage: after the charging voltage is controlled to be maintained at a first room temperature aging voltage to directly charge the aluminum electrolytic capacitor for a first preset time period, in a high-temperature environment, the charging voltage is controlled to be maintained at the first high-temperature aging voltage, and the charging and discharging of the aluminum electrolytic capacitor are carried out at a first pulse frequency for a second preset time period; the second aging stage: and after the charging voltage is controlled to be maintained at the rated aging voltage and the aluminum electrolytic capacitor is directly charged for a third preset time period, in a high-temperature environment, the charging voltage is controlled to be maintained at a second high-temperature aging voltage and the aluminum electrolytic capacitor is charged and discharged for a fourth preset time period at a second pulse frequency. According to the invention, the aluminum electrolytic capacitor is aged by adopting two aging modes, so that the quality of an oxide film can be ensured, the leakage current is restrained from rising, the aging effect is ensured, and the product performance is optimized.
Description
Technical Field
The invention relates to the technical field of capacitors, in particular to an aging method and an aging circuit of an aluminum electrolytic capacitor and the aluminum electrolytic capacitor.
Background
The lead-wire aluminum electrolytic capacitor is used as a common device on an electronic circuit and has the electrical functions of filtering, bypass, coupling, decoupling, phase inversion and the like. With the wider and wider application of aluminum electrolytic capacitor products, high-voltage products are not only limited to conventional 400V-500V, 550V ultrahigh-voltage products, but also developed and used. For the ultra-high voltage aluminum electrolytic capacitor product, the working voltage is relatively high, and the voltage withstand value required for the anode aluminum foil of the capacitor is relatively high. In the production process of the capacitor, the oxidation film damaged in the previous working procedure is repaired by the aging process of the capacitor, so that the breakdown rate of the aluminum electrolytic capacitor is reduced, the breakdown rate and the leakage current of the aluminum electrolytic capacitor are reduced, and the yield and the service life of the aluminum electrolytic capacitor are improved. If the traditional aging method is adopted, the voltage is too high, the repairing capability is limited, a large amount of heat is easily generated due to too high pressurization, the phenomena of poor blocking, bottom blocking, even explosion and the like caused by the rising of the air pressure of the sealed space inside the aluminum electrolytic capacitor are easily caused, meanwhile, the product leakage is not qualified due to incomplete repairing, the early failure of the product is caused, and the service life is greatly shortened.
Disclosure of Invention
The invention provides an aging method, an aging circuit and an aluminum electrolytic capacitor for solving or partially solving the problems existing in the prior art when an ultra-high voltage aluminum electrolytic capacitor is aged by the existing aging method.
In one aspect of the present invention, there is provided a method for aging an aluminum electrolytic capacitor, the method comprising:
The first aging stage: in a room temperature environment, controlling a charging voltage to be maintained at a first room temperature aging voltage to perform direct charging on the aluminum electrolytic capacitor for a first preset time period, and after the direct charging for the first preset time period is completed, controlling the charging voltage to be maintained at a first high temperature aging voltage and performing charging and discharging on the aluminum electrolytic capacitor for a second preset time period at a first pulse frequency in a high temperature environment, wherein the first room temperature aging voltage is higher than the first high temperature aging voltage;
The second aging stage: and in a room temperature environment, controlling the charging voltage to be maintained at a rated aging voltage to perform direct charging for a third preset time period on the aluminum electrolytic capacitor, and after the direct charging for the third preset time period is completed, controlling the charging voltage to be maintained at a second high-temperature aging voltage and performing charging and discharging for a fourth preset time period on the aluminum electrolytic capacitor at a second pulse frequency in a high-temperature environment, wherein the second high-temperature aging voltage is lower than the rated aging voltage.
Further, the value of the first room temperature aging voltage is 93% -97% of the rated aging voltage, the value of the first high temperature aging voltage is 91% -95% of the rated aging voltage, and the value of the second high temperature aging voltage is 97% -99% of the rated aging voltage.
Further, prior to the first aging stage, the method further comprises:
Boosting stage: and in a room temperature environment, controlling the charging voltage to rise to the first room temperature aging voltage in stages so as to directly charge the aluminum electrolytic capacitor.
Further, the controlling the charging voltage to rise to the first room temperature burn-in voltage in stages includes:
And controlling the charging voltage to rise by a first preset voltage each time, and maintaining the current charging voltage within a preset voltage stabilizing period after the first preset voltage is raised each time, wherein the value of the first preset voltage is 1/15-1/5 of the first room temperature aging voltage.
Further, after the second aging stage, the method further comprises:
Room temperature aging stage: and in a room temperature environment, controlling the charging voltage to be maintained at the second high-temperature aging voltage to directly charge the aluminum electrolytic capacitor for a fifth preset duration.
Further, after the room temperature aging stage, the method further comprises: and controlling the aluminum electrolytic capacitor to cool and discharge in a normal temperature environment.
Further, the charging and discharging the aluminum electrolytic capacitor for a second preset time period at the first pulse frequency includes: controlling the aluminum electrolytic capacitor to have a duty ratio X within the duration of the second preset time period: and Y is charged and discharged, wherein X is the charging duration time for completing one charge and discharge pulse period, Y is the discharging duration time for completing one charge and discharge pulse period, the value of X is 3 min-5 min, and the value of Y is 20 s-40 s.
Further, the charging and discharging the aluminum electrolytic capacitor for a fourth preset time period at the second pulse frequency includes: controlling the aluminum electrolytic capacitor to have a duty ratio W within the duration of the fourth preset duration: and Z is charged and discharged, wherein W is the duration of charging after one charge and discharge pulse period is completed, Z is the duration of discharging after one charge and discharge pulse period is completed, the value of W is 3 min-5 min, and the value of Z is 20 s-40 s.
Further, the rated aging voltage is between the rated working voltage of the aluminum electrolytic capacitor and the formation voltage value of the anode aluminum foil of the aluminum electrolytic capacitor.
Further, the value range of the first preset duration is 1-3 h;
the value range of the second preset time length is 2-4 h;
The value range of the third preset time length is 1-3 h;
the value range of the fourth preset time length is 4-6 h.
Further, the value range of the fifth preset time length is 0.5 h-3 h.
In another aspect of the present invention, there is provided a burn-in circuit for implementing the burn-in method of an aluminum electrolytic capacitor as described above, the burn-in circuit including a constant current constant voltage power supply, a bidirectional switch, a discharge resistor and a charge resistor,
The charging resistor is connected with a plurality of aluminum electrolytic capacitors to be aged in series to form an aging branch, and the aging branch is connected with the constant-current constant-voltage power supply through a first switch terminal of the two-way switch; the discharging resistor is connected with the aging branch through a second switch terminal of the bidirectional switch, when the first switch terminal of the bidirectional switch is closed, the aging branch is connected with the constant-current constant-voltage power supply to charge the aluminum electrolytic capacitor to be aged, when the two switch terminals of the bidirectional switch are closed, the aging branch is connected with the discharging resistor to discharge the aluminum electrolytic capacitor to be aged, and the aging branch is arranged in the oven.
Further, the aging circuit includes at least one aging leg.
The invention further provides an aluminum electrolytic capacitor prepared by the aging method of the aluminum electrolytic capacitor, which comprises a cathode aluminum foil, an anode aluminum foil, electrolytic paper, guide pins and electrolyte, wherein the electrolytic paper is arranged between the anode aluminum foil and the cathode aluminum foil at intervals, and the guide pins are respectively arranged on the anode aluminum foil and the cathode aluminum foil.
Further, the method comprises the steps of,
The formation voltage of the anode aluminum foil is more than 1.4 times of the rated voltage value of the aluminum electrolytic capacitor;
The formation voltage of the cathode aluminum foil is more than 3 VF;
The formation voltage of the guide pin is more than 1.08 times of the rated voltage value of the aluminum electrolytic capacitor.
Further, the material of the electrolytic paper is various fiber composite electrolytic paper, the thickness of the electrolytic paper is 30-40 mu m, the density is 0.7g/cm 3～0.8g/cm3, and the electrolytic paper is arranged as 2-6 layers.
Further, the electrolyte is a long carbon chain branched organic ammonium salt of a nanoscale material.
According to the aging method, the aging circuit and the aluminum electrolytic capacitor provided by the embodiment of the invention, the first aging stage and the second aging stage are arranged, and the first aging stage is as follows: after the charging voltage is controlled to be maintained at a first room temperature aging voltage to directly charge the aluminum electrolytic capacitor for a first preset time period, in a high-temperature environment, the charging voltage is controlled to be maintained at the first high-temperature aging voltage, and the charging and discharging of the aluminum electrolytic capacitor are carried out at a first pulse frequency for a second preset time period; the second aging stage: and after the charging voltage is controlled to be maintained at the rated aging voltage and the aluminum electrolytic capacitor is directly charged for a third preset time period, in a high-temperature environment, the charging voltage is controlled to be maintained at a second high-temperature aging voltage and the aluminum electrolytic capacitor is charged and discharged for a fourth preset time period at a second pulse frequency. According to the invention, the aluminum electrolytic capacitor is aged by adopting two aging modes, so that the quality of an oxide film can be ensured, the leakage current is restrained from rising, the aging effect is ensured, and the product performance is optimized.
The foregoing description is only an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present invention in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present invention more readily apparent.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
FIG. 1 is a schematic structural diagram of an aluminum electrolytic capacitor according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a burn-in circuit according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart of an aging method of an aluminum electrolytic capacitor according to an embodiment of the present invention;
fig. 4 is a graph showing a correspondence relationship between aging voltage and aging time of an aluminum electrolytic capacitor according to an embodiment of the present invention.
The figure indicates:
1. cathode aluminum foil; 2. an anode aluminum foil; 3. electrolyzing paper; 4. and (5) a guide pin.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
It will be understood by those skilled in the art that all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs unless defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Fig. 1 is a schematic structural diagram of an aluminum electrolytic capacitor according to an embodiment of the present invention, as can be seen from fig. 1, the aluminum electrolytic capacitor according to an embodiment of the present invention includes a cathode aluminum foil 1, an anode aluminum foil 2, electrolytic paper 3, a guide pin 4 and an electrolyte (not shown in the drawing), wherein the electrolytic paper 3 is disposed between the anode aluminum foil 2 and the cathode aluminum foil 1 at intervals, and the guide pins are disposed on the anode aluminum foil 2 and the cathode aluminum foil 1 respectively. Wherein the formation voltage of the anode aluminum foil is more than 1.4 times of the rated voltage value of the aluminum electrolytic capacitor; the formation voltage of the cathode aluminum foil is more than 3 VF; the formation voltage of the guide pin is more than 1.08 times of the rated voltage value of the aluminum electrolytic capacitor. In one specific embodiment of the invention, when the rated working voltage of the aluminum electrolytic capacitor is 550WV, the anode aluminum foil is an anode aluminum foil with the formation voltage of 780VF or more; the cathode aluminum foil is formed into a cathode aluminum foil with the chemical concentration of more than 3 VF; so that the electrolytic capacitor has more stable performance under the condition of long-term use. The lead 4 is a lead with a voltage of 600V or more. So as to reduce the heating value of the aluminum electrolytic capacitor in the actual use process and improve the reliability.
The thickness of the electrolytic paper 3 is 30-40 mu m, the density is 0.7-0.8 g/cm3, and the electrolytic paper 3 is arranged in 2-6 layers, so that the voltage-resistant capability is improved due to the superposition of the electrolytic paper 3, and meanwhile, the aluminum electrolytic capacitor has good loss angle and low ESR.
Further, the product manufacturing process is that the coiled core is soaked in electrolyte in a vacuumizing and pressurizing mode after being dried, a rubber plug is sleeved, a matched aluminum shell is put into a sealing mode, and then a sleeve is sleeved, wherein the sleeve has an insulating effect, and meanwhile, the aluminum shell can be prevented from being short-circuited and generating static electricity, so that the service life of the capacitor is prolonged. The electrolyte is generally selected from long carbon chain branched organic ammonium salts of nanoscale materials, which is favorable for improving the performance and reliability of the capacitor and ensuring the quality and service life of the product.
The aluminum electrolytic capacitor of the embodiment of the invention is manufactured by the aging circuit of the following embodiment and by the aging method of the aluminum electrolytic capacitor of the following embodiment.
Fig. 2 is a schematic diagram of a circuit for aging according to an embodiment of the present invention, in which the aging circuit shown in fig. 2 is used to age an aluminum electrolytic capacitor, as can be seen from fig. 2, the aging circuit according to an embodiment of the present invention includes a constant current and constant voltage power supply CCV, a bidirectional switch K, a discharge resistor Rr and a charge resistor Rp,
The charging resistor Rp is connected with a plurality of aluminum electrolytic capacitors C to be aged in series to form an aging branch, and the aging branch is connected with the constant-current constant-voltage power supply CCV through a first switch terminal of the bidirectional switch K; the discharging resistor Rr is connected with the aging branch through a second switch terminal of the bidirectional switch K, when the first switch terminal of the bidirectional switch K is closed, the aging branch is connected with the constant-current constant-voltage power supply CCV to charge the aluminum electrolytic capacitor C to be aged, when the two switch terminals connected with the bidirectional switch K are closed, the aging branch is connected with the discharging resistor Rr to discharge the aluminum electrolytic capacitor C to be aged, and the aging branch is arranged in the oven.
Further, the aging circuit of the embodiment of the invention comprises at least one aging branch circuit so as to simultaneously complete the aging of a plurality of aluminum electrolytic capacitors C to be aged.
It should be noted that, the constant-current and constant-voltage power supply CCV in the embodiment of the invention is a power supply with adjustable voltage, so that the output voltage of the constant-current and constant-voltage power supply CCV adjusted in the aging process is conveniently operated, and the adjustment of the charging voltage of the aluminum electrolytic capacitor to be aged is realized. In one embodiment of the invention, rr is a high power resistor of 100 to 500 Ω. Rp is a high-power wire-wound resistor of 500-1000 omega. In the aging process, the output voltage value of the constant-current constant-voltage power supply CCV can be manually adjusted, the output voltage value of the constant-current constant-voltage power supply CCV can be automatically adjusted along with time through program setting, and the switching position of the bidirectional switch can be adjusted along with time, so that the invention is not limited.
Fig. 3 schematically shows a flowchart of a method for aging an aluminum electrolytic capacitor according to an embodiment of the present invention. As can be seen from fig. 3, the aging method of the aluminum electrolytic capacitor according to the embodiment of the invention comprises the following steps:
S11, a first aging stage: in a room temperature environment, controlling a charging voltage to be maintained at a first room temperature aging voltage to perform direct charging on the aluminum electrolytic capacitor for a first preset time period, and after the direct charging for the first preset time period is completed, controlling the charging voltage to be maintained at a first high temperature aging voltage and performing charging and discharging on the aluminum electrolytic capacitor for a second preset time period at a first pulse frequency in a high temperature environment, wherein the first room temperature aging voltage is higher than the first high temperature aging voltage;
In the embodiment of the invention, the value of the first room temperature aging voltage is 93% -97% of the rated aging voltage, and the value of the first high temperature aging voltage is 91% -95% of the rated aging voltage, wherein the rated aging voltage is between the rated working voltage of the aluminum electrolytic capacitor and the formation voltage value of the anode aluminum foil of the aluminum electrolytic capacitor. The value range of the first preset time length is 1-3 h, and the value range of the second preset time length is 2-4 h. In a specific embodiment of the present invention, the first room temperature aging voltage is 95% of the rated aging voltage, the first high temperature aging voltage is 93% of the rated aging voltage, the first preset time period is 2h, and the second preset time period is 3h.
Further, the charging and discharging of the aluminum electrolytic capacitor for a second preset time period at the first pulse frequency includes: controlling the aluminum electrolytic capacitor to have a duty ratio X within the duration of the second preset time period: and Y is charged and discharged, wherein X is the charging duration time for completing one charge and discharge pulse period, Y is the discharging duration time for completing one charge and discharge pulse period, the value of X is 3 min-5 min, and the value of Y is 20 s-40 s. In one embodiment of the invention, X is 4 minutes and Y is 30 seconds.
S12, a second aging stage: and in a room temperature environment, controlling the charging voltage to be maintained at a rated aging voltage to perform direct charging for a third preset time period on the aluminum electrolytic capacitor, and after the direct charging for the third preset time period is completed, controlling the charging voltage to be maintained at a second high-temperature aging voltage and performing charging and discharging for a fourth preset time period on the aluminum electrolytic capacitor at a second pulse frequency in a high-temperature environment, wherein the second high-temperature aging voltage is lower than the rated aging voltage.
In the embodiment of the invention, the value of the second high-temperature aging voltage is 97-99% of the rated aging voltage, and the value range of the third preset time length is 1-3 h; the value range of the fourth preset time length is 4-6 h. In a specific embodiment of the present invention, the second high temperature aging voltage is 99% of the rated aging voltage, the third preset duration is 2h, and the fourth preset duration is 5h.
Further, charging and discharging the aluminum electrolytic capacitor for a fourth preset time period at the second pulse frequency includes: controlling the aluminum electrolytic capacitor to have a duty ratio W within the duration of the fourth preset duration: and Z is charged and discharged, wherein W is the duration of charging after one charge and discharge pulse period is completed, Z is the duration of discharging after one charge and discharge pulse period is completed, the value of W is 3 min-5 min, and the value of Z is 20 s-40 s. In one embodiment of the invention, W is 4 minutes and Z is 30 seconds. It should be noted that, in the embodiment of the present invention, the value of W of the second preset duty cycle and the value of X of the first preset duty cycle may be the same or different, and the value of Z of the second preset duty cycle and the value of Y of the first preset duty cycle may be the same or different.
In addition, the high temperature environment in each aging stage of the embodiment of the invention is generally set to be 85-90 ℃ environment, and the value is generally 85 ℃.
Unlike traditional capacitor aging method, the embodiment of the invention adopts two aging stages to perform aging cycle on the aluminum electrolytic capacitor, and alternately performs room temperature and high temperature and direct charge and pulse charge and discharge in each aging stage, thereby ensuring the quality of the oxide film of the aluminum electrolytic capacitor, inhibiting the return of leakage current, ensuring the aging effect and ensuring the best product performance. In addition, the embodiment of the invention adopts two aging stages, and the duration of high-temperature aging is divided into two stages, so that the phenomena of bottom bulging, plug bulging, explosion and the like of the capacitor are avoided due to overlarge heat generation and overlarge internal air pressure caused in the aging process of the aluminum electrolytic capacitor.
Further, the aging method according to the embodiment of the present invention further includes a boosting stage before the first aging stage is performed. Therefore, the aging method of the aluminum electrolytic capacitor according to the embodiment of the invention further includes the following steps, not shown in the drawings:
S00, boosting stage: and in a room temperature environment, controlling the charging voltage to rise to a first room temperature aging voltage in stages so as to directly charge the aluminum electrolytic capacitor.
In the embodiment of the present invention, the step-up of the control charging voltage to the first room temperature aging voltage includes: and controlling the charging voltage to rise by a first preset voltage each time, and maintaining the current charging voltage within a preset voltage stabilizing period after the first preset voltage is raised each time, wherein the value of the first preset voltage is 1/15-1/5 of the first room temperature aging voltage. Specifically, the value of the first preset voltage is the first room temperature aging voltage/the expected step-up number. For example, when the voltage value of the first room temperature aging voltage is 800V, if the desired number of step-up steps is 8, the value of the first preset voltage at this time is 100V. In actual operation, the specific number of boosting steps may also be determined according to the desired value of the first preset voltage. The present invention is not particularly limited thereto.
The value range of the preset voltage stabilizing time is 20-50 min, wherein the preset voltage stabilizing time is 30min in one specific embodiment of the invention.
It should be noted that, a large amount of heat is generated along with the repair of the anode aluminum foil of the aluminum electrolytic capacitor in the boosting process of the boosting stage, so that the boosting stage of the embodiment of the invention adopts a staged boosting mode, and maintains pressure for a period of time after each boosting, so that the aluminum electrolytic capacitor is buffered for a period of time, so that the repair of the anode aluminum foil can generate a large amount of heat dissipation, and the electrolyte flows back fully, thereby ensuring the uniformity of the aging process. The problems of the high-voltage product that the high-voltage product rises to the aging voltage once, the heating is serious, and the bottom, the plug and the explosion of the drum are avoided.
Further, after the second aging stage is performed, the aging method according to the embodiment of the present invention further includes the following steps, which are not shown in the drawings:
S33, room temperature aging stage: and in a room temperature environment, controlling the charging voltage to be maintained at the second high-temperature aging voltage to directly charge the aluminum electrolytic capacitor for a fifth preset duration.
In the embodiment of the invention, the value range of the fifth preset time length is 0.5 h-3 h, and in a specific embodiment of the invention, the fifth preset time length is 1h.
According to the aging method of the aluminum electrolytic capacitor, a plurality of aging stages in a room-temperature environment are adopted, so that a dielectric oxide film damaged and destroyed by the aluminum electrolytic capacitor is quickly repaired under the action of voltage and current, the room-temperature aging is to provide a buffer time for a product, the aging rate is properly reduced, the oxide film is completely repaired, and the performance of the capacitor is improved.
In addition, the aging method of the aluminum electrolytic capacitor further comprises a cooling discharging step, namely after the room-temperature aging stage is completed, the aluminum electrolytic capacitor is controlled to be cooled and discharged in a room-temperature environment. After cooling discharge is completed, the electric parameters of the capacitor are stabilized, and then the aluminum electrolytic capacitor with qualified parameters can be selected through sorting.
In order to more clearly describe the aging method of the aluminum electrolytic capacitor according to the embodiment of the present invention, fig. 4 schematically shows a correspondence chart of aging voltage and aging time of the aluminum electrolytic capacitor provided by the embodiment of the present invention, and a specific embodiment of the present invention is described in detail with reference to fig. 4:
s01, a boosting stage: in a room temperature environment, controlling the charging voltage to rise by a value of a first room temperature aging voltage at intervals of 100V, and carrying out pressure maintaining operation for half an hour every time the charging voltage rises, wherein the first room temperature aging voltage is 95% of a rated aging voltage;
S02, aging at room temperature for the first time, and under the room temperature environment, controlling the charging voltage to be maintained at the first room temperature aging voltage to directly charge the aluminum electrolytic capacitor for 2 hours;
S03, conducting high-temperature aging for the first time, increasing the temperature of the oven by 85 ℃, controlling the charging voltage to be 93% of the rated aging voltage, and conducting charging and discharging on the aluminum electrolytic capacitor for 3 hours at a first pulse frequency (charging for 4min and discharging for 30S);
s04, aging at room temperature for the second time, and controlling the charging voltage to be maintained at the rated aging voltage under the room temperature environment to directly charge the aluminum electrolytic capacitor for 2 hours;
S05, conducting secondary high-temperature aging, increasing the temperature of the oven by 85 ℃, controlling the charging voltage to be 99% of the rated aging voltage, and conducting 5h charging and discharging on the aluminum electrolytic capacitor at a second pulse frequency (charging for 4min and discharging for 30S);
s06, third room temperature aging, and under the room temperature environment, controlling the charging voltage to be 99% of the rated aging voltage, and directly charging the aluminum electrolytic capacitor for 1 h.
Step S02 and step S03 constitute a first aging stage, and step S04 and step S05 constitute a second aging stage. Before each aging stage is executed, a corresponding charging voltage adjusting link is further included, namely the charging voltage is quickly adjusted to the voltage required by the corresponding aging stage, and the invention is not specifically described. The embodiment of the invention adopts two high-temperature aging cycles, wherein the first high-temperature aging is to complete one-time high-temperature aging with 93% aging voltage, and the oxide film is approximately repaired; the second high-temperature aging is to complete the second high-temperature aging of the product after the first aging with 99% aging voltage, so that the oxide film is completely repaired.
The aging of the aluminum electrolytic capacitor is alternately performed by adopting direct charge (at room temperature) and pulse charge and discharge (at high temperature), and two aging circulation modes are adopted, so that the quality of an oxide film is ensured, the rising of leakage current is inhibited, the aging effect is ensured, and the product performance is optimal. The pulse aging at the high temperature stage enables the oxide film structure to be more stable in crystal structure, which is important for improving the service life characteristic of products and reducing leakage current, and meanwhile, products with poor high temperature resistance are removed, so that the efficiency is improved.
For the purposes of simplicity of explanation, the methodologies are shown and described as a series of acts, it is to be understood and appreciated by one of ordinary skill in the art that the methodologies are not limited by the order of acts, as some acts may, in accordance with the methodologies, take place in other order or concurrently. Further, those skilled in the art will appreciate that the embodiments described in the specification are presently preferred embodiments, and that the acts are not necessarily required by the embodiments of the invention.
The invention provides an aging method of an aluminum electrolytic capacitor, an aging circuit and the aluminum electrolytic capacitor, wherein a first aging stage and a second aging stage are arranged, and the first aging stage comprises the following steps: after the charging voltage is controlled to be maintained at a first room temperature aging voltage to directly charge the aluminum electrolytic capacitor for a first preset time period, in a high-temperature environment, the charging voltage is controlled to be maintained at the first high-temperature aging voltage, and the charging and discharging of the aluminum electrolytic capacitor are carried out at a first pulse frequency for a second preset time period; the second aging stage: and after the charging voltage is controlled to be maintained at the rated aging voltage and the aluminum electrolytic capacitor is directly charged for a third preset time period, in a high-temperature environment, the charging voltage is controlled to be maintained at a second high-temperature aging voltage and the aluminum electrolytic capacitor is charged and discharged for a fourth preset time period at a second pulse frequency. According to the invention, the aluminum electrolytic capacitor is aged by adopting two aging modes, so that the quality of an oxide film can be ensured, the leakage current is restrained from rising, the aging effect is ensured, and the product performance is optimized.
Those skilled in the art will appreciate that while some embodiments herein include some features but not others included in other embodiments, combinations of features of different embodiments are meant to be within the scope of the application and form different embodiments. For example, any of the claimed embodiments of the application can be used in any combination.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (15)
1. A method for aging an aluminum electrolytic capacitor, the method comprising:
The first aging stage: in a room temperature environment, controlling a charging voltage to be maintained at a first room temperature aging voltage to perform direct charging on the aluminum electrolytic capacitor for a first preset time period, and after the direct charging for the first preset time period is completed, controlling the charging voltage to be maintained at a first high temperature aging voltage and performing charging and discharging on the aluminum electrolytic capacitor for a second preset time period at a first pulse frequency in a high temperature environment, wherein the first room temperature aging voltage is higher than the first high temperature aging voltage;
The second aging stage: in a room temperature environment, controlling the charging voltage to be maintained at a rated aging voltage to perform direct charging for a third preset time period on the aluminum electrolytic capacitor, and after the direct charging for the third preset time period is completed, controlling the charging voltage to be maintained at a second high-temperature aging voltage and performing charging and discharging for a fourth preset time period on the aluminum electrolytic capacitor at a second pulse frequency in a high-temperature environment, wherein the second high-temperature aging voltage is lower than the rated aging voltage;
Before the first aging stage, the method further comprises:
Boosting stage: controlling the charging voltage to rise to the first room temperature aging voltage in stages under the room temperature environment so as to directly charge the aluminum electrolytic capacitor;
The value of the first room temperature aging voltage is 93% -97% of the rated aging voltage, the value of the first high temperature aging voltage is 91% -95% of the rated aging voltage, and the value of the second high temperature aging voltage is 97% -99% of the rated aging voltage.
2. The method of claim 1, wherein the controlling the charging voltage to rise in stages to the first room temperature burn-in voltage comprises:
And controlling the charging voltage to rise by a first preset voltage each time, and maintaining the current charging voltage within a preset voltage stabilizing period after the first preset voltage is raised each time, wherein the value of the first preset voltage is 1/15-1/5 of the first room temperature aging voltage.
3. The method of claim 1, wherein after the second aging stage, the method further comprises:
Room temperature aging stage: and in a room temperature environment, controlling the charging voltage to be maintained at the second high-temperature aging voltage to directly charge the aluminum electrolytic capacitor for a fifth preset duration.
4. A method according to claim 3, characterized in that after the room temperature aging stage, the method further comprises: and controlling the aluminum electrolytic capacitor to cool and discharge in a normal temperature environment.
5. The method of claim 1, wherein the charging and discharging the aluminum electrolytic capacitor at the first pulse frequency for a second predetermined period of time comprises: controlling the aluminum electrolytic capacitor to have a duty ratio X within the duration of the second preset time period: and Y is charged and discharged, wherein X is the charging duration time for completing one charge and discharge pulse period, Y is the discharging duration time for completing one charge and discharge pulse period, the value of X is 3 min-5 min, and the value of Y is 20 s-40 s.
6. The method of claim 1, wherein the charging and discharging the aluminum electrolytic capacitor at the second pulse frequency for a fourth predetermined period of time comprises: controlling the aluminum electrolytic capacitor to have a duty ratio W within the duration of the fourth preset duration: and Z is charged and discharged, wherein W is the duration of charging after one charge and discharge pulse period is completed, Z is the duration of discharging after one charge and discharge pulse period is completed, the value of W is 3 min-5 min, and the value of Z is 20 s-40 s.
7. The method according to any one of claims 1 to 6, wherein the rated aging voltage has a value between the rated operating voltage of the aluminum electrolytic capacitor and the formation voltage value of the anode aluminum foil of the aluminum electrolytic capacitor.
8. The method according to any one of claims 1 to 6, wherein,
The value range of the first preset time length is 1-3 h;
the value range of the second preset time length is 2-4 h;
The value range of the third preset time length is 1-3 h;
the value range of the fourth preset time length is 4-6 h.
9. The aging method according to claim 3, wherein the fifth preset time period is in a range of 0.5h to 3h.
10. A burn-in circuit for realizing the burn-in method of an aluminum electrolytic capacitor as claimed in any one of claims 1 to 9, characterized in that the burn-in circuit comprises a constant current and constant voltage power supply, a bidirectional switch, a discharge resistor and a charge resistor,
The charging resistor is connected with a plurality of aluminum electrolytic capacitors to be aged in series to form an aging branch, and the aging branch is connected with the constant-current constant-voltage power supply through a first switch terminal of the two-way switch; the discharging resistor is connected with the aging branch through a second switch terminal of the bidirectional switch, when the first switch terminal of the bidirectional switch is closed, the aging branch is connected with the constant-current constant-voltage power supply to charge the aluminum electrolytic capacitor to be aged, when the two switch terminals of the bidirectional switch are closed, the aging branch is connected with the discharging resistor to discharge the aluminum electrolytic capacitor to be aged, and the aging branch is arranged in the oven.
11. The burn-in circuit of claim 10 wherein the burn-in circuit comprises at least one burn-in leg.
12. An aluminum electrolytic capacitor prepared by the aging method of the aluminum electrolytic capacitor as claimed in any one of claims 1 to 9, comprising a cathode aluminum foil, an anode aluminum foil, electrolytic paper, guide pins and electrolyte, wherein the electrolytic paper is arranged between the anode aluminum foil and the cathode aluminum foil at intervals, and the guide pins are respectively arranged on the anode aluminum foil and the cathode aluminum foil.
13. The aluminum electrolytic capacitor as recited in claim 12, wherein,
The formation voltage of the anode aluminum foil is more than 1.4 times of the rated voltage value of the aluminum electrolytic capacitor;
The formation voltage of the cathode aluminum foil is more than 3 VF;
The formation voltage of the guide pin is more than 1.08 times of the rated voltage value of the aluminum electrolytic capacitor.
14. The aluminum electrolytic capacitor as recited in claim 12, wherein the electrolytic paper is made of a plurality of fiber composite electrolytic papers, the thickness of the electrolytic paper is 30 μm to 40 μm, the density is 0.7g/cm 3～0.8g/cm3, and the electrolytic paper is provided in 2 to 6 layers.
15. The aluminum electrolytic capacitor as recited in claim 12, wherein the electrolyte is a long carbon chain branched organic ammonium salt of a nanoscale material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211047838.7A CN115274303B (en) | 2022-08-30 | 2022-08-30 | Aging method and aging circuit for aluminum electrolytic capacitor and aluminum electrolytic capacitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211047838.7A CN115274303B (en) | 2022-08-30 | 2022-08-30 | Aging method and aging circuit for aluminum electrolytic capacitor and aluminum electrolytic capacitor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115274303A CN115274303A (en) | 2022-11-01 |
| CN115274303B true CN115274303B (en) | 2024-04-19 |
Family
ID=83754822
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211047838.7A Active CN115274303B (en) | 2022-08-30 | 2022-08-30 | Aging method and aging circuit for aluminum electrolytic capacitor and aluminum electrolytic capacitor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115274303B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116344220B (en) * | 2023-03-20 | 2024-04-30 | 广东风华高新科技股份有限公司 | Aging method of aluminum electrolytic capacitor |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03112117A (en) * | 1989-09-27 | 1991-05-13 | Nippon Chemicon Corp | Aging method for electrolytic capacitor |
| JPH04337619A (en) * | 1991-05-14 | 1992-11-25 | Marcon Electron Co Ltd | Aging method of non-polar electrolyte capacitor |
| CN1085009A (en) * | 1992-09-29 | 1994-04-06 | 西安电子科技大学 | Pulse voltage aging device for aluminium electrolytic capacitor |
| KR20000014155A (en) * | 1998-08-18 | 2000-03-06 | 권호택 | Apparatus and methode for manufacturing foil of al electrolytic condenser |
| CN201654151U (en) * | 2010-04-20 | 2010-11-24 | 深圳中元电子有限公司 | High-power and high-frequency pulse aging apparatus for medium- and high-voltage aluminum electrolytic capacitor |
| CN202631658U (en) * | 2012-05-24 | 2012-12-26 | 航天科工防御技术研究试验中心 | Discharging device for aging test of high-voltage and high-capacity aluminum electrolytic capacitor |
| CN103646793A (en) * | 2013-11-06 | 2014-03-19 | 中国振华（集团）新云电子元器件有限责任公司 | Aging method for improving breakdown voltage of solid electrolyte tantalum capacitor |
| CN110867323A (en) * | 2019-12-03 | 2020-03-06 | 珠海格力新元电子有限公司 | Ultrahigh-voltage long-life capacitor core, capacitor, charging module and charging pile |
| CN110993352A (en) * | 2019-12-27 | 2020-04-10 | 横店集团东磁有限公司 | Aging method of aluminum electrolytic capacitor |
-
2022
- 2022-08-30 CN CN202211047838.7A patent/CN115274303B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03112117A (en) * | 1989-09-27 | 1991-05-13 | Nippon Chemicon Corp | Aging method for electrolytic capacitor |
| JPH04337619A (en) * | 1991-05-14 | 1992-11-25 | Marcon Electron Co Ltd | Aging method of non-polar electrolyte capacitor |
| CN1085009A (en) * | 1992-09-29 | 1994-04-06 | 西安电子科技大学 | Pulse voltage aging device for aluminium electrolytic capacitor |
| KR20000014155A (en) * | 1998-08-18 | 2000-03-06 | 권호택 | Apparatus and methode for manufacturing foil of al electrolytic condenser |
| CN201654151U (en) * | 2010-04-20 | 2010-11-24 | 深圳中元电子有限公司 | High-power and high-frequency pulse aging apparatus for medium- and high-voltage aluminum electrolytic capacitor |
| CN202631658U (en) * | 2012-05-24 | 2012-12-26 | 航天科工防御技术研究试验中心 | Discharging device for aging test of high-voltage and high-capacity aluminum electrolytic capacitor |
| CN103646793A (en) * | 2013-11-06 | 2014-03-19 | 中国振华（集团）新云电子元器件有限责任公司 | Aging method for improving breakdown voltage of solid electrolyte tantalum capacitor |
| CN110867323A (en) * | 2019-12-03 | 2020-03-06 | 珠海格力新元电子有限公司 | Ultrahigh-voltage long-life capacitor core, capacitor, charging module and charging pile |
| CN110993352A (en) * | 2019-12-27 | 2020-04-10 | 横店集团东磁有限公司 | Aging method of aluminum electrolytic capacitor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115274303A (en) | 2022-11-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN115274303B (en) | Aging method and aging circuit for aluminum electrolytic capacitor and aluminum electrolytic capacitor | |
| US20170027537A1 (en) | Medical diagnostic high-frequency x-ray machines and power supply devices thereof | |
| CN111579958B (en) | IGBT switching characteristic test circuit and test method | |
| US20100289458A1 (en) | Capacitor electrolyte | |
| CN203631703U (en) | Control circuit of electric car battery heating system | |
| WO2018053721A1 (en) | Charging method, charging control system and charging device for power supply, and unmanned aerial vehicle | |
| CN103400694B (en) | A kind of manufacture method of high-voltage electrolysis capacitor | |
| CN110875148B (en) | Aging method of capacitor | |
| CN103310981A (en) | Producing method for full-tantalum-gas sealed capacitor | |
| JP5050742B2 (en) | DC standby voltage compensation method for instantaneous voltage drop compensator | |
| KR20090103132A (en) | Balenced charging apparatus of ultracapacitors and balenced charging method thereof | |
| CN115084724A (en) | Vehicle, lithium dendrite control method, battery management system and computer equipment | |
| JP2814833B2 (en) | High pressure steam discharge lamp with built-in starter | |
| CN102034609A (en) | Method and device for aging aluminum electrolytic capacitors in batches | |
| CN111371162A (en) | High-voltage large-capacity capacitor rapid discharge technology | |
| CN111681876B (en) | Ultrahigh voltage aluminum electrolytic capacitor and manufacturing method thereof | |
| CN105634102B (en) | A kind of supply unit and its startup control method for starting automobile | |
| CN114660470A (en) | Development and design method capable of preventing failure of soft package lithium ion battery due to external short circuit | |
| CN103295783A (en) | Method for manufacturing electrolytic capacitor | |
| CN201503774U (en) | Aluminum electrolytic capacitor ageing circuit and device | |
| CN116344220B (en) | Aging method of aluminum electrolytic capacitor | |
| CN110993352A (en) | Aging method of aluminum electrolytic capacitor | |
| CN116631777B (en) | Novel aging method for aluminum electrolytic capacitor | |
| US2407685A (en) | Fluorescent light control | |
| JP2006108192A (en) | Solid electrolytic capacitor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |