CN203192598U - Film capacitor applied in DC-link occasion - Google Patents
Film capacitor applied in DC-link occasion Download PDFInfo
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- CN203192598U CN203192598U CN 201320103921 CN201320103921U CN203192598U CN 203192598 U CN203192598 U CN 203192598U CN 201320103921 CN201320103921 CN 201320103921 CN 201320103921 U CN201320103921 U CN 201320103921U CN 203192598 U CN203192598 U CN 203192598U
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- polypropylene film
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Abstract
The utility model relates to the technical field of an electric power electronic capacitor, especially relates to a DC-link capacitor used on alternating current/inversion equipment for direct current support and filtering and specifically relates to a film capacitor applied in a DC-link occasion. The film capacitor applied in the DC-link occasion has advantages of large capacity, small volume, low cost, reliable and stable performance and high safety and can take the place of an electrolytic capacitor within a large scope in the DC-link occasion of the electric power electronic field. The film capacitor comprises a capacitor core. The film capacitor is characterized in that the capacitor core is prepared by winding metalized polypropylene film, the metalized polypropylene film comprises polypropylene film medium and a capacitor polar plate, and the capacitor polar plate is a metal coating layer formed on the polypropylene film medium through vapor plating.
Description
Technical field
The utility model relates to the power electronic capacitor technical field, relates in particular to a kind ofly for doing that direct current supports and the DC-link capacitor of filtering on the interchange/contravariant equipment, is specially a kind of film capacitor of the DC-link of being applied to occasion.
Background technology
DC-link capacitor purposes is more extensive, this electric capacity is connected in parallel on direct current one side behind the rectifier bridge, play the filtering voltage regulation effect, because the Capacity Ratio that the DC-Link capacitor requires is higher, people adopt electrochemical capacitor mostly for a long time, because electrochemical capacitor has single capacitance big, the advantage that volume is little, but the advantage of relative electrochemical capacitor, its shortcoming also are significantly same, that is exactly withstand voltage low, and unstable properties and life-span are short.
The alumina dielectric medium attribute that electrochemical capacitor uses and the conductivity of electrolyte have limited its highest withstand voltage, the maximum nominal voltage of typical electrochemical capacitor is that 500V is to 600V, so require under the more high-tension situation, must be with many capacitances in series during use, as exchanging behind the input rectifying respectively with electrochemical capacitor two strings or three strings of 400V of 380VAC and 690VAC, higher voltage needs more series connection; Owing to the insulation resistance difference of each electric capacity, the user must give and connect resistance on each electric capacity with balanced voltage, increase the unsteadiness of electric capacity virtually simultaneously; In addition, if surpassing the reverse voltage of 1.2 times of rated voltages is added on the electrochemical capacitor, can cause the generation of inner chemical reaction, if the duration is long, also may explode or along with the release electrolyte of electric capacity internal pressure can flow out, the existence of these problems in use is danger close for capacitor.
Have electrochemical capacitor only and have life problems in all kinds of capacitors, the electrochemical capacitor life termination is in fact because electrolyte volatilization reduces and to cause, and this is unavoidable for electrochemical capacitor, because be exactly electrolyte from the negative electrode of structure itself.The life-span of electrochemical capacitor has just determined the life-span of whole components under a lot of situations.Cause the short destabilizing factor of life-span of electrochemical capacitor also to comprise: the parameter of electric capacity is big with variation of ambient temperature; Loss angle is big, so anti-harmonic wave ability is little, the inefficacy ratio is big; Maximum surge voltage allowed to bear is low, have only rated voltage 1.15 times or 1.2 times, forces the user to have to consider surge voltage but not nominal voltage.
And if adopt thin-film capacitor, the many disadvantages of electrochemical capacitor will be well solved, thin-film capacitor adopts metallized film to reel and forms, withstand voltage height, temperature characterisitic is stable, loss angle is little, self-inductance is little, and the antisurge ability is strong, no acid pollution, life-span is long, the thin-film capacitor life-span in the time of 70 ℃ that generally meets application conditions is 100,000 hours, is far longer than the life-span of electrochemical capacitor, needs high voltage, high effective value electric current in using, overvoltage, reverse voltage, peak voltage are arranged, also have the occasion of long-life requirement simultaneously, thin-film capacitor is best choice really.
Though the advantage of the alternative electrochemical capacitor of thin-film capacitor clearly, but can't realize in these application scenarios major parts for a long time, also be very real because limiting its factor of promoting the use of on a large scale only, it is little namely to substitute now the single capacitance of the thin-film capacitor of electrochemical capacitor, volume is big, general than big about 4 ~ 10 times with the electrochemical capacitor of capacity, the user is for to cost and consideration easy to use, and the application of existing thin-film capacitor replacement electrochemical capacitor temporarily can't realize.
Summary of the invention
In order to address the above problem, the utility model provides a kind of film capacitor of the DC-link of being applied to occasion, it has, and the capacity large volume is little, cost is low, reliable and stable, security performance advantages of higher, can substitute electrochemical capacitor on a large scale in field of power electronics DC-link occasion.
Its technical scheme is such: a kind of film capacitor of the DC-link of being applied to occasion, it comprises capacitor body, it is characterized in that, described capacitor body is reeled by metallized polypropylene film and is formed, described metallized polypropylene film comprises polypropylene film medium and capacitor plate, and described capacitor plate is the coat of metal of evaporation on described polypropylene film medium.
It is further characterized in that described coat of metal edge is coated with the alloy thickened area; The described coat of metal is aluminium coat; Described alloy thickened area is allumen.
After adopting structure of the present utility model, evaporation has the coat of metal on the polypropylene film medium, and the very thin thickness of the coat of metal has increased capacitance when having reduced volume, reduced cost, the coat of metal has better self-healing property as thin as a wafer again, withstand voltage height, and electric capacity inside can produce power not accumulate, avoided electric capacity to puncture the possibility that produces blast, reliable and stable, the security performance height can substitute electrochemical capacitor on a large scale in field of power electronics DC-link occasion; Simultaneously be coated with the alloy thickened area at coat of metal edge, can guarantee that like this coating contacts with drawing the good of gilding layer, guarantees its overcurrent capability.
Description of drawings
Fig. 1 is film capacitor overall structure figure;
Fig. 2 is the metallized polypropylene film cut-away view.
Embodiment
See Fig. 1, shown in Figure 2, a kind of film capacitor that is applied to the DC-link occasion, it comprises capacitor body 1, aluminium shell 2, the plastics location covers 3, exit 4, potting compound 5, connect copper strips 6, capacitor body 1 is connected to exit 4 by connecting copper strips 6, and the insulation of aluminium shell 2 inner sealings is done potting compound 5 with epoxy resin, exit 4 covers 3 with aluminium shell 2 by the plastics location and insulate, capacitor body 1 is reeled by metallized polypropylene film 7 and is formed, and metallized polypropylene film 7 comprises polypropylene film medium 8 and capacitor plate, and capacitor plate is the coat of metal 9 of evaporation on polypropylene film medium 8, polypropylene film medium 8 thickness are 3 ~ 15um, and the coat of metal 9 thickness are 30 ~ 100nm; The coat of metal 9 edges are coated with alloy thickened area 10.
Below film capacitor of the present utility model is described further: the capacity of thin-film capacitor and the thickness of the film square relation of being inversely proportional to, thin-film capacitor as same volume, the every reduction by 1/2 of dielectric thickness, capacity namely increases by 4 times, the thickness that reduces film can effectively increase the capacitance of thin-film capacitor, but film is more thin, withstand voltage is more low, when after evaporation has the coat of metal 9 on the polypropylene film medium 8, the coat of metal 9 has self-healing property, namely breakdown point can be as wound healing instantaneous recovery insulation property when dielectric breakdown, therefore thin-film capacitor can adopt single thin film medium as thin as a wafer that very high applied electric field intensity just can be arranged, and it is little namely to have a volume, capacity is big, withstand voltage high advantage; The general aluminium coat that adopts when evaporation metal coating 9, thickness can have only about 1/3 of common metal thin film coating, withstand voltagely like this can improve 80% ~ 120%; Be that aluminium is as coated metal because of what adopt simultaneously, aluminium can form alumina layer rapidly and prevent further oxidation in air, needn't worry that coating is too thin and by rapidly oxide etch, in the coat of metal 9 marginal zones, many plating one deck alloys are as thickened area, generally can choose allumen, can guarantee that like this coat of metal 9 contacts with drawing the good of gilding layer, guarantees its overcurrent capability.
We can roughly understand film capacitor of the present utility model replaces electrochemical capacitor in power electronics DC-link occasion advantage by following form:
| The AC-input voltage grade | The required capacitance voltage grade of DC side | The electrolysis scheme | Conventional thin-film capacitor scheme | The utility model thin-film capacitor scheme | Remarks | |
| 380VAC | 800VDC | 2 400V series connection | Need the 6Um dielectric thickness | Need the 3.5Um dielectric thickness | Original 1/3 volume | |
| 660/ | 1200VDC | 3 400V series connection | Need the 8Um dielectric thickness | Need the 4Um dielectric thickness | Original 1/4 | |
| 1140VAC | 2000VDC | |||||
| 5 400V series connection | Need the 14Um dielectric thickness | Need the 7Um dielectric thickness | Original 1/4 volume |
Simultaneously, the coat of metal 9 as thin as a wafer, the self-healing energy needed is very little, when electric capacity has the energy that produces when puncture taking place can consuming by " self-healing ", electric capacity is inner just can produce power not to be accumulated, do not reach " energy detonates " that the electric capacity blast produces, have good explosion-proof ability, security performance is good; Film capacitor of the present utility model is the dry type structure, and no positive-negative polarity is fit to any mounting means and environmental requirement, and can avoid the issuable blast of electrochemical capacitor or along with the release electrolyte of electric capacity internal pressure flows out, and is more safe and reliable.
Select for use electrochemical capacitor reality not need too big capacity in a lot of application scenarios of field of power electronics, only in order to guarantee the overcurrent capability of dc bus capacitor, because single electrochemical capacitor overcurrent capability is too low, have to guarantee overcurrent by the mode of many parallel connections; If selected thin-film capacitor for use, because the conveyance capacity of thin-film capacitor can reach 10 times to 50 times of electrochemical capacitor, do not need too big capacity just can satisfy need of work fully; We can say that it is not simple " capacity " displacement " capacity " that thin-film capacitor substitutes electrochemical capacitor, but function is alternative, thereby cost is lower, performance is more superior, and is more reliable and stable.
Claims (4)
1. film capacitor that is applied to the DC-link occasion, it comprises capacitor body, it is characterized in that, described capacitor body is reeled by metallized polypropylene film and is formed, described metallized polypropylene film comprises polypropylene film medium and capacitor plate, and described capacitor plate is the coat of metal of evaporation on described polypropylene film medium.
2. a kind of film capacitor that is applied to the DC-link occasion according to claim 1 is characterized in that, described coat of metal edge is coated with the alloy thickened area.
3. a kind of film capacitor that is applied to the DC-link occasion according to claim 2 is characterized in that, the described coat of metal is aluminium coat.
4. according to claim 2 or 3 described a kind of film capacitors that are applied to the DC-link occasion, it is characterized in that described alloy thickened area is allumen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320103921 CN203192598U (en) | 2013-03-07 | 2013-03-07 | Film capacitor applied in DC-link occasion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320103921 CN203192598U (en) | 2013-03-07 | 2013-03-07 | Film capacitor applied in DC-link occasion |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203192598U true CN203192598U (en) | 2013-09-11 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320103921 Expired - Lifetime CN203192598U (en) | 2013-03-07 | 2013-03-07 | Film capacitor applied in DC-link occasion |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203192598U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103151169A (en) * | 2013-03-07 | 2013-06-12 | 无锡宸瑞新能源科技有限公司 | Thin film capacitor applicable to DC-link occasion |
| CN104299775A (en) * | 2014-10-18 | 2015-01-21 | 安徽精新能源科技股份有限公司 | Large-scale ultra-silence capacitor and manufacturing method thereof |
| CN105679536A (en) * | 2016-03-22 | 2016-06-15 | 安徽铜峰电子股份有限公司 | Low-inductance power electronic capacitor |
-
2013
- 2013-03-07 CN CN 201320103921 patent/CN203192598U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103151169A (en) * | 2013-03-07 | 2013-06-12 | 无锡宸瑞新能源科技有限公司 | Thin film capacitor applicable to DC-link occasion |
| CN104299775A (en) * | 2014-10-18 | 2015-01-21 | 安徽精新能源科技股份有限公司 | Large-scale ultra-silence capacitor and manufacturing method thereof |
| CN105679536A (en) * | 2016-03-22 | 2016-06-15 | 安徽铜峰电子股份有限公司 | Low-inductance power electronic capacitor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130911 |