Summary of the invention
In order to overcome above-mentioned deficiency, the utility model purpose is to provide the aluminium electrolytic capacitor of the ultralow temperature LED driving power special use of a kind of stable work in work, long service life.
To achieve these goals, the technical solution adopted in the utility model is: the aluminium electrolytic capacitor of a kind of ultralow temperature LED driving power special use, include housing, guide pin, electrode foil, guide pin inserts in the housing and is connected with electrode foil, and the top of described housing and the position that is positioned at the guide pin installation are provided with Jiao Gai.
Described Jiao Gai adopts EPMD Jiao Gai.
The periphery of described housing is provided with the gum cover of one deck insulation.
Described electrode foil is the electrode aluminium foil, and its surface is provided with one deck Al2O3 film.
The beneficial effects of the utility model: because the thicker Al2O3 film of one deck densification has been established on the electrode foil surface, cooperate highly purified Cathode Foil and guide pin, help to improve the electric conductivity of material, thereby under low temperature environment, greatly reduce equivalent series resistance; Owing to established EPMD Jiao Gai, Gu Jiaogai is except resistance to oxidation, anti-ozone, anti-solvent corrosion ability are strong, also has good low temperature elasticity, guarantee the low temperature seal of capacitor, effectively prevent because of poor sealing causes the excessive phenomenon of electrolyte, guarantee that product works more reliable and more stable in low temperature environment.
Embodiment
As shown in Figure 1, the aluminium electrolytic capacitor of a kind of ultralow temperature LED driving power special use includes housing 2, guide pin 3, electrode foil 5, and guide pin 3 inserts in the housings 2 and is connected with electrode foil 5, and the top of described housing 2 and the position that is positioned at the guide pin installation are provided with glue and cover 4.
Described glue lid 4 adopts EPMD Jiao Gai.
The periphery of described housing 2 is provided with the gum cover 1 of one deck insulation.
Described electrode foil 5 is the electrode aluminium foil, and its surface is provided with one deck Al2O3 film.
Operation principle: aluminium electrolytic capacitor of the present utility model makes improvements simultaneously from selection and technology two aspects, has following characteristics:
(1) it is too high to overcome the low temperature impedance
The size of equivalent series resistance ESR is subjected to the influence of following factor: the 1. quality of anode oxide film; 2. the conductivity of electrode foil, lead-in wire and the contact resistance of the two; 3. the conductivity of electrolyte.
The utility model reduces the ESR value of product in the following manner:
(1) selection:
The utility model is selected high withstand voltage the hanging down than volume anode foil of high-purity for use, and this aluminium foil is more shallow with respect to high specific volume aluminium foil corrosion line, and after changing into through high pressure, the Al2O3 film of surface production is thick and fine and close, and insulating properties is good.Cooperate highly purified Cathode Foil and lead-in wire (guide pin), help to improve the electric conductivity of material.
(2) technology:
Before positive and negative paper tinsel nail joint, increase pretreatment process respectively, on aluminium foil, desire the aperture that the respective shapes size is gone out in nail joint place earlier, again with the guide pin nail joint at the aperture place, can avoid unnecessary paper tinsel bits to be mixed between nail joint petal and the aluminium foil, and guarantee the aluminium foil paperback compacting of linking closely of nail joint petal, thereby reduce the nail joint impedance.
(3) electrolytic conductivity:
Electrolyte shows on the conductivity of electrolyte solution the resistance of electric current, and is inversely proportional to conductivity, and the power of the conductive capability of electrolyte depends on the number of contained ion in the solution, the valence mumber of ionic charge and the speed that ion moves.Solvent of the present utility model has lower viscosity, helps to improve the ion rate travel, and solute is had stronger solvation effect, can dissolve solute well, increases contained ion populations in the solution.
The utility model guarantees product low temperature electrical characteristic by reducing the impedance of product, helps the LED driving power normally to start in low temperature environment.
(2) overcoming electrolyte ultralow temperature easily solidifies and separates out crystallization
Conducting medium between aluminum electrolysis capacitance cathode foil and the anode foils is an electrolyte, and electrolyte can be prone under the ultralow temperature situation and solidify and phenomenon that crystallization is separated out, sharply descends thereby cause the impedance of capacitor to increase considerably conductivity.The utility model is by reasonably combined main solvent and secondary solvent, obtain the low electrolyte of solidifying point, by suitable increase solute ratio, and add to inhale the hydrogen agent, press down aqua etc. and reduce saturated vapor pressure, further reduce the setting temperature of electrolyte, make product not only have good solution properties, and have electrical characteristic preferably, guarantee the job stability of product at-65 ℃.
(3) overcome the easy aging phenomenon of alminium electrolytic condenser Jiao Gai in the extreme low temperature environment
It is aging that Jiao Gai easily takes place in the extreme environment of high and cold high temperature aluminium electrolytic capacitor, causes products air tightness bad, and the volatilization of electrolysis, lost finally causes the life-span of aluminium electrolytic capacitor sharply to be decayed.
The EPMD Jiao Gai that the utility model is selected for use is except resistance to oxidation, anti-ozone, anti-solvent corrosion ability are strong, also has good low temperature elasticity, guarantee the low temperature seal of capacitor, effectively prevent because of poor sealing causes the excessive phenomenon of electrolyte, guarantee that structurally product can carry out work reliably in low temperature environment.