CN104916440A - Improved structure of film capacitor - Google Patents
Improved structure of film capacitor Download PDFInfo
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- CN104916440A CN104916440A CN201510312191.XA CN201510312191A CN104916440A CN 104916440 A CN104916440 A CN 104916440A CN 201510312191 A CN201510312191 A CN 201510312191A CN 104916440 A CN104916440 A CN 104916440A
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Abstract
The invention mainly discloses an improved structure of a film capacitor, comprising a capacitance core and metal pins. The capacitance core comprises an electrode plates and a dielectric film; a sprayed gold layer is arranged between the metal pins and the electrode plates and the dielectric film; the capacitance core is of a four-layer structure, comprising the electrode plate, the dielectric film, the electrode plate and the dielectric film sequentially; two electrode plates are stacked in a staggered manner; the electrode plates each are an aluminum film with two metalized sides; the aluminum film with two metalized sides comprises a plastic film and metallic aluminum films arranged on a front side and a back side of the plastic film; the metal pins are covered with damping cotton; and end portions where the plastic film, the dielectric film and the sprayed gold layer are connected are each provided with a marginal thickened area. The improved structure solves the problem that a traditional small-sized film capacitor cannot bear a large current and is prone to have a poor contact with the metal pins, and has good anti-vibration performance.
Description
Technical field
The present invention relates to a kind of modified node method of thin-film capacitor.
Background technology
In multiple electronic component, the electronic component that capacitor is that use face is the widest, consumption is maximum, does not replace, they play a different role in circuit respectively.Capacitor is various in style, and its basic structure is identical with principle, and two-plate is made up of sheet metal, and spacing is very little, and centre is separated by dielectric, forms capacitor.From the differentiation of materials and structures, be three large major products with ceramic capacitor, electrolytic capacitor and organic film condenser.Film capacitor, owing to having the good characteristics such as capacity is large, impedance is low, stray inductance is little, loss is low, is the capacitor that a kind of performance is very excellent.Film capacitor has again a kind of metallized film autofrettage, namely on a plastic film with the very thin metal of vacuum evaporation last layer with as electrode, to save the thickness of electrode foil, reduce the volume of capacitor unit capacity, its great advantage is " self-healing " characteristic, namely metallic film capacitor possess to return to by the light of nature immediately after single electric weakness or partial breakdown puncture before the self-healing property function of electrical property.
Namely metallized film capacitor is replace metal forming as electrode in the surperficial evaporation layer of metal film of polyester film, because the thickness of layer of metallized film is much smaller than the thickness of metal forming, therefore after winding, volume is also much little than type metal foil type electric capacity volume.The great advantage of metalized film electric capacity is " self-healing " property.If so-called self-healing property is exactly, thin film dielectrics is owing to putting existing defects at certain and occur puncture short under overvoltage effect, and the metal layer of breakdown point can be formed in instant melting evaporation under arcing one very little of metal area, make two of electric capacity pole pieces mutually insulated and still working on again, therefore greatly improve the reliability of capacitor work.Though metallic film capacitor has above-mentioned huge advantage, but compared with type metal foil type electric capacity, also there is weakness: one is that capacity stability is not so good as foil type capacitor, this is because metallized capacitance easily occurs that under long-term work condition capacity is lost and capacity all can be caused to reduce after self-healing; Two is that tolerance big current ability is poor, and this is because layer of metallized film is much thinner than metal forming, and bearing great current ability is more weak; Three is physical stability shortcomings, because metallized film capacitor overall volume is little, does not generally do antivibration mount, so be not very desirable in physics vibration resistance especially; Four is because the electrode thickness of diaphragm type is less, little with metal pins contact area, easily causes the problem of loose contact.
Summary of the invention
The technical issues that need to address of the present invention are, provide a kind of modified node method of thin-film capacitor, solve traditional small size thin-film capacitor and cannot bear high electric current, easily and the problem of metal pins loose contact, and possess good resistance to shock.
Technical scheme of the present invention is: a kind of modified node method of thin-film capacitor, comprise capacitor core and metal pins, described capacitor core comprises battery lead plate and deielectric-coating, metal pins and battery lead plate, gilding layer is provided with between deielectric-coating, described capacitor core is 4 Rotating fields, be followed successively by battery lead plate, deielectric-coating, battery lead plate, deielectric-coating, the staggered superposition of two electrode plate, battery lead plate is two-sided metallization aluminium film, two-sided metallization aluminium film comprises plastic film and is just located at plastic film, the aluminium film of reverse side, on described metal pins, cover has damping cotton, plastic film, the end that deielectric-coating is connected with gilding layer is equipped with stays thickened area, limit.
Preferably, described plastic film is fire resistant polypropylene film, and described deielectric-coating is polypropylene light film.
Preferably, the thickness of described battery lead plate is 0.7mm, and described polypropylene light film thickness is 0.9mm, and it is 0.1mm that two battery lead plates oppositely inside contract spacing.
Preferably, the cross section of described gilding layer is in " convex " shape, and the wider side of contact-making surface is connected with battery lead plate.
Preferably, described capacitor core outside is provided with sealing wax layer, and sealing wax layer comprises interior sealing wax layer and outer sealing wax layer, is provided with epoxy resin layer between interior sealing wax layer and outer sealing wax layer.
Preferably, described capacitor core outside is provided with moulds box, moulds between box and capacitor core and is provided with epoxy resin layer.
Described capacitor core outside is provided with sealing wax layer, and sealing wax layer outside is provided with epoxy resin layer, and epoxy resin layer outer cover moulds box.
After adopting technique scheme, tool of the present invention has the following advantages:
Capacitor core in the present invention is improved to four layers by traditional three layers, five layers, battery lead plate is by the structure with two-sided metallization aluminium film, namely all aluminium film is provided with at the positive and negative of plastic film, the thickness of battery lead plate is decreased from volume, but do not reduce in dielectric capacity, can not direct short-circuit under the impact of instant high-voltage big current, avoid high pressure arcing punch-through, improve the reliability of capacitor.Mutually wrong folded between two-layer two-sided metallization aluminium film, width is shortened for traditional interval set-up mode, make the spacing of metal pins can be reduced to less than 10 millimeters, separate with deielectric-coating between two-layer two-sided metallization aluminium film, bottom increases by a layer dielectric again, not only effectively prevent from being short-circuited between two battery lead plates, can also greatly improve and optimize the magnitude of current of metallic film capacitor.And specially done at two-sided metallization aluminium film and deielectric-coating in the present invention and stay limit to process, and stay limit to thicken, in order to be exactly the contact area between increase with gilding layer, increase conductive area, prevent because electric capacity affects between lower two-sided metallization aluminium film and gilding layer by cold expanding shrinkage for a long time and sealing-off phenomenon occurs, on metal pins in the present invention simultaneously, cover has damping cotton, the part vibration being transferred to metal pins from electronics mainboard can be absorbed by damping cotton, reduce the vibration of capacitor core part, thus the sealing-off probability also further reduced between two-sided metallization aluminium film and gilding layer, improve the useful life of capacitor core, stability is better.
Accompanying drawing explanation
Accompanying drawing 1 is the internal structure schematic diagram of the embodiment of the present invention 1;
Accompanying drawing 2 is the schematic diagram of battery lead plate, deielectric-coating and gilding layer junction
Accompanying drawing 3 is capacitor core external structure schematic diagram in embodiment 1;
Accompanying drawing 4 is capacitor core external structure schematic diagram in embodiment 2.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described further:
As shown in Figure 1 to Figure 2, a kind of modified node method of thin-film capacitor, comprise capacitor core and metal pins 3, described capacitor core comprises battery lead plate 1 and deielectric-coating 2, metal pins and battery lead plate, gilding layer 30 is provided with between deielectric-coating, described capacitor core is 4 Rotating fields, be followed successively by battery lead plate, deielectric-coating, battery lead plate, deielectric-coating, the staggered superposition of two electrode plate, battery lead plate is two-sided metallization aluminium film, two-sided metallization aluminium film comprises plastic film 101 and is just located at plastic film, the aluminium film 102 of reverse side, capacitor core is by traditional three layers, five layers are improved to four layers, battery lead plate is by the structure with two-sided metallization aluminium film, namely all aluminium film is provided with at the positive and negative of plastic film, the thickness of battery lead plate is decreased from volume, but do not reduce in dielectric capacity, can not direct short-circuit under the impact of instant high-voltage big current, avoid high pressure arcing punch-through, improve the reliability of capacitor, mutually wrong folded between two-layer two-sided metallization aluminium film, width is shortened for traditional same linear interval set-up mode, make the spacing of metal pins can be reduced to less than 10 millimeters, separate with deielectric-coating between two-layer two-sided metallization aluminium film, bottom increases by a layer dielectric again, not only effectively prevent from being short-circuited between two battery lead plates, can also greatly improve and optimize the magnitude of current of metallic film capacitor, the end that in the present embodiment, plastic film and deielectric-coating are connected with gilding layer is in addition equipped with stays thickened area, limit 10, because metallization aluminium film is relative to much little on electrode foil thickness, also relatively little with the contact area of gilding layer, to expand with heat and contract with cold for a long time or under vibrated impact, two-sided metallization aluminium film is easy to and gilding layer generation sealing-off at electric capacity, so two-sided metallization aluminium film and deielectric-coating have specially done and stay limit to process in this enforcement, and stay limit to thicken, in order to be exactly the contact area between increase with gilding layer, increase conductive area, prevent because electric capacity affects between lower metallization aluminium film and gilding layer by cold expanding shrinkage for a long time and sealing-off phenomenon occurs, as preferably, the cross section of described gilding layer is in " convex " shape, the wider side of contact-making surface inwards and be connected with battery lead plate, one outward facing sides of contact-making surface relative narrower, contact area between gilding layer and two-sided metallization aluminium film is increased in pairs, reduce the possibility of sealing-off more.On metal pins simultaneously in the present embodiment, cover has damping cotton 301, the part vibration being transferred to metal pins from electronics mainboard can be absorbed by damping cotton, reduce the vibration of capacitor core part, further reduce the sealing-off probability between two-sided metallization aluminium film and gilding layer thus improve useful life of capacitor core, stability is better, damping cotton can be that two metal pins overlap a damping cotton separately separately, also can be that two metal pins intert jointly on the damping cotton that same volume is larger, in general the latter is socketed more convenient, the diameter of metal pins own is less, firmly one insert and can easily pass damping cotton, two metal pins intert one needs pressing once jointly.
Described plastic film is fire resistant polypropylene film, described deielectric-coating is polypropylene light film, plastic film in the present embodiment is preferably the fire resistant polypropylene film of high frequency, the isotacticity of the raw material particle that the fire resistant polypropylene film of high frequency and normal temperature polypropylene screen use is different, the fire resistant polypropylene film of high frequency use isotacticity to be greater than the polypropylene particles of 98.5, and normal temperature film uses polypropylene particles isotacticity to be less than 96.5, that is raw-material purity is higher, the fire resistant polypropylene film of high frequency at the ability of opposing temperature and machine capability resistance to voltage in the case of a high temperature also just along with significantly improving, also just will be good than the temperature resistant capability of normal temperature polypropylene screen many, capacitor heatproof is made to bring up to+110 DEG C by original+85 DEG C, the rated voltage of capacitor is made to bring up to 1250V by original 1000V, proof voltage brings up to 2.5UR by original 1.6UR, under high temperature occasion, every index is all improved largely, thus also improve reliability and the useful life of product.Be applicable to, in the high AC and DC circuit of high-temperature high-frequency big current, power, be particularly suitable for the energy-conserving light source circuit of the electricity-saving lamp of high-voltage large current medium-high frequency occasion, LED.
In order to make capacitor volume miniaturized further, establish for same linear interval between original capacitor electrode foil or plastic film, cause metal leg apart from excessive, common metal pin-pitch is at more than 15mm, make capacitor volume large, the scope of application is little, and two electrode plate stagger overlap in the present embodiment, and the thickness of described battery lead plate is 0.7mm, described polypropylene light film thickness is 0.9mm, it is 0.1mm that two battery lead plates oppositely inside contract spacing, the program is utilized to shorten overall width, the spacing of metal pins can be reduced to below 10mm, and improve withstand voltage.
As shown in Figure 2, in order to strengthen heat resistance of the present invention, described capacitor core outside is provided with sealing wax layer, sealing wax layer comprises interior sealing wax layer 41 and outer sealing wax layer 42, epoxy resin layer 5 is provided with between interior sealing wax layer and outer sealing wax layer, wax layer possesses resistant to elevated temperatures characteristic, the structure of double-deck sealing wax layer has increased considerably high-temperature stability, and pressed from both sides one deck epoxy resin layer between two-layer sealing wax layer, epoxy resin layer stability is high, possesses good flame retardant effect, double-deck sealing wax layer is coordinated well to protect capacitor core, utilize this structure, general without outer cover electric appliance casing.
As shown in Figure 3; for another kind of embodiment; the difference of this embodiment and the first embodiment is that capacitor core external protective structures is different; sealing wax layer is not had unlike in this embodiment with embodiment; the substitute is aesthetic appearance relatively unified mould box 6; mould between box and capacitor core and be provided with epoxy resin layer 5; heat-resisting quantity is short of to some extent than embodiment 1; but add in outward appearance uniformity; and vibration resistance adds than embodiment 1, compare that to be useful in some temperature be not under very high operational environment.
Certain those skilled in the art also easily expect other embodiments, described capacitor core outside is provided with sealing wax layer, sealing wax layer outside is provided with epoxy resin layer, epoxy resin layer outer cover moulds box, so both ensure that the heat-resisting quantity of capacitor, also ensure that unified appearance, and epoxy resin layer also can play fire-retardant and antivibration effect.
Below only just the present invention preferably example be described, but can not be interpreted as it is limitations on claims.The present invention not only limits to and above example, and its concrete structure allows to change, and those skilled in the art can make various change and distortion according to the present invention, only otherwise depart from spirit of the present invention, all should belong to the scope that claims of the present invention define.
Claims (7)
1. the modified node method of a thin-film capacitor, comprise capacitor core and metal pins (3), described capacitor core comprises battery lead plate (1) and deielectric-coating (2), metal pins and battery lead plate, gilding layer (30) is provided with between deielectric-coating, it is characterized in that: described capacitor core is 4 Rotating fields, be followed successively by battery lead plate, deielectric-coating, battery lead plate, deielectric-coating, the staggered superposition of two electrode plate, battery lead plate is two-sided metallization aluminium film, two-sided metallization aluminium film comprises plastic film (101) and is just located at plastic film, the aluminium film (102) of reverse side, on described metal pins, cover has damping cotton (301), plastic film, the end that deielectric-coating is connected with gilding layer is equipped with stays thickened area, limit (10).
2. the modified node method of a kind of thin-film capacitor according to claim 1, is characterized in that: described plastic film is fire resistant polypropylene film, and described deielectric-coating is polypropylene light film.
3. the modified node method of a kind of thin-film capacitor according to claim 2, is characterized in that: the thickness of described battery lead plate is 0.7mm, and described polypropylene light film thickness is 0.9mm, and it is 0.1mm that two battery lead plates oppositely inside contract spacing.
4. the modified node method of a kind of thin-film capacitor according to claim 1, is characterized in that: the cross section of described gilding layer is in " convex " shape, and the wider side of contact-making surface is connected with battery lead plate.
5. the modified node method of a kind of thin-film capacitor according to Claims 1-4 any one, it is characterized in that: described capacitor core outside is provided with sealing wax layer, sealing wax layer comprises interior sealing wax layer (41) and outer sealing wax layer (42), is provided with epoxy resin layer (5) between interior sealing wax layer and outer sealing wax layer.
6. the modified node method of a kind of thin-film capacitor according to Claims 1-4 any one, is characterized in that: described capacitor core outside is provided with moulds box (6), moulds between box and capacitor core and is provided with epoxy resin layer (5).
7. the modified node method of a kind of thin-film capacitor according to Claims 1-4 any one, is characterized in that: described capacitor core outside is provided with sealing wax layer, and sealing wax layer outside is provided with epoxy resin layer, and epoxy resin layer outer cover moulds box.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510312191.XA CN104916440A (en) | 2015-06-09 | 2015-06-09 | Improved structure of film capacitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510312191.XA CN104916440A (en) | 2015-06-09 | 2015-06-09 | Improved structure of film capacitor |
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| CN104916440A true CN104916440A (en) | 2015-09-16 |
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| CN201510312191.XA Pending CN104916440A (en) | 2015-06-09 | 2015-06-09 | Improved structure of film capacitor |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0298912A (en) * | 1988-10-05 | 1990-04-11 | Matsushita Electric Ind Co Ltd | Metallized film capacitor |
| JPH03101260A (en) * | 1989-09-14 | 1991-04-26 | Nec Corp | Thin film capacitor |
| CN203397910U (en) * | 2013-08-15 | 2014-01-15 | 长兴友畅电子有限公司 | Novel metallized film capacitor |
| CN203397906U (en) * | 2013-08-15 | 2014-01-15 | 长兴友畅电子有限公司 | Film capacitor |
| CN203826222U (en) * | 2014-02-10 | 2014-09-10 | 长兴友畅电子有限公司 | Sheet type ultra-small high voltage heavy current capacitor |
| CN204632588U (en) * | 2015-06-09 | 2015-09-09 | 长兴友畅电子有限公司 | A kind of modified node method of thin-film capacitor |
-
2015
- 2015-06-09 CN CN201510312191.XA patent/CN104916440A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0298912A (en) * | 1988-10-05 | 1990-04-11 | Matsushita Electric Ind Co Ltd | Metallized film capacitor |
| JPH03101260A (en) * | 1989-09-14 | 1991-04-26 | Nec Corp | Thin film capacitor |
| CN203397910U (en) * | 2013-08-15 | 2014-01-15 | 长兴友畅电子有限公司 | Novel metallized film capacitor |
| CN203397906U (en) * | 2013-08-15 | 2014-01-15 | 长兴友畅电子有限公司 | Film capacitor |
| CN203826222U (en) * | 2014-02-10 | 2014-09-10 | 长兴友畅电子有限公司 | Sheet type ultra-small high voltage heavy current capacitor |
| CN204632588U (en) * | 2015-06-09 | 2015-09-09 | 长兴友畅电子有限公司 | A kind of modified node method of thin-film capacitor |
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Application publication date: 20150916 |