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Film Capacitors - General technical information

Film CapacitorsGeneral technical informationDate:June 2018 EPCOS AG 2018. Reproduction, publication and dissemination of this publication, enclosures hereto and theinformation contained therein without EPCOS' prior express consent is AG is a TDK Group data book describes fixed Capacitors with plastic film dielectrics, also termedfilm capacitorsor FK of film Classification by dielectricThe characteristics and application possibilities of film Capacitors are affected so strongly by thedielectric used that Capacitors are grouped and designated according to the type of identification codes for the type of construction.

S Series resistance, due to contacts (leads, sprayed metal and film metallization) R P Parallel resistance, due to insulation resistance C Capacitance C, R S and L S are magnitudes that vary in the frequency domain (AC). R P is a magnitude defined in DC (insulation resistance). 2.2 Capacitance 2.2.1 Rated capacitance / measuring conditions

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Transcription of Film Capacitors - General technical information

1 Film CapacitorsGeneral technical informationDate:June 2018 EPCOS AG 2018. Reproduction, publication and dissemination of this publication, enclosures hereto and theinformation contained therein without EPCOS' prior express consent is AG is a TDK Group data book describes fixed Capacitors with plastic film dielectrics, also termedfilm capacitorsor FK of film Classification by dielectricThe characteristics and application possibilities of film Capacitors are affected so strongly by thedielectric used that Capacitors are grouped and designated according to the type of identification codes for the type of construction.

2 Describing the dielectric and the basic tech-nology applied, are defined in standard DIN EN 60062 last character of the short code indicates the type of dielectric:T Polyethylene terephthalate (PET)P Polypropylene (PP)N Polyethylene naphthalate (PEN)AnM( metallization) is prefixed to the short identification code of Capacitors with metallizedfilms.*)MFP and MFT Capacitors are constructed using a combination of metal foils and metallizedplastic films. They are not covered by DIN EN 60062 1 Classification of film Capacitors in DIN EN 60062:2005 General technical informationPage2of41 Please readImportant notesandCautions and of plastic film dielectrics (generalized typical values)The following table is a summary of important technical tosectionDielectric constant ( r) drift with time (iz= C/C)% temperature coefficient c10-6/K 250+600+ humidity coefficient c(50.

3 95%)10-6/% .. 100500 .. 700700 .. factor (1 kHz) constants100 00025 00025 , absorption% Classification by film and foil arrangementsFor a better understanding of the differences in the internal structure of Capacitors , figure 2 showssome typical film and foil 2 Examples of typical film and foilarrangementsGeneral technical informationPage3of41 Please readImportant notesandCautions and 3 shows the relation between various film/foil arrangements and the capacitor connectionFilm and foil arrangementsTypesMKPMKTMKNEMI suppression capacitorsMFPM etal foilMetallized plastic filmPlastic film without metallizationFigure 3 Schematic film and foil arrangements of various capacitor typesGeneral technical informationPage4of41 Please readImportant notesandCautions and Classification by

4 ConstructionEPCOS FK Capacitors are produced using either winding methods or stacking Wound technologyIn the conventional production process, Capacitors are made by individually rolling the metallizedfilms or the film/foils into cylindrical rolls and then covering them with an insulating sleeve or capacitor, radial leadsWound capacitor, axial leadsFigure 4 Conventional production process in wound technologyIn the MKT, MKP and MFP type series, our production range includes Capacitors with space-sav-ing flattened wound bodies with insulating coatings or inside plastic casings, as well as cylindricalwound Capacitors .

5 Flat windings are produced by compressing the cylindrical rolls before they areplaced in casings, so that the casing form is optimally technical informationPage5of41 Please readImportant notesandCautions and Stacked-film technologyIn stacked-film production technology, large rings of metallized film are wound onto core wheelswith diameters up to 60 cm. In this way the "master Capacitors " are produced under well-definedand constant 5 Stacked-film production technologyAs a result, the capacitor production lots obtained when the rings are sawed apart to produce theactual stacked-film capacitor bodies are especially handling capabilitiesof stacked-film Capacitors are of a particular advantage.

6 Eachindividual layer acts as a single capacitor of small capacitance, so any damage to the contactsdue to overloading is restricted to the layers concerned, which might get disconnected. There-fore the total capacitance can decrease slightly, without further affecting the performance andreliability of the , uncoated stacked-film Capacitors (SilverCapTM) offer the special advantage thatthey can be adapted to customer design requirements. A wide range of sizes can be offeredwithout considering case size standards or provide special tools for new technical informationPage6of41 Please readImportant notesandCautions and rules for SilverCaps:For a fixed lead spacing(and thus capacitor length "l"), the capacitor width "w" and height "h"can be adjusted within the following ranges:Lead mm10 mm15 mmWidth "w" (mm)min.

7 / "h" (mm)min. / / / 206/256/25 Whatever the dimensions, the volume must remain approximately the 6 Examples of special capacitor dimensions for the same capacitance and voltage ratingsGeneral technical informationPage7of41 Please readImportant notesandCautions and Classification by finish and terminalA variety of standard designs with corresponding types of terminals are available to suit differentapplications and operating leadsUncoated (SilverCap)YesNoCoatedYesYesSealed in plastic case (boxed)YesYesAxial leadsCylindrical windingNoYesFlat windingNoYesSMD platesUncoated/wrappedYesNoOthers (customized)Strap terminalsYesYesFigure 7 Capacitor designsGeneral technical informationPage8of41 Please readImportant notesandCautions and Equivalent circuit diagramAny real capacitor can be modeled by the following schematic:Figure 8 Real capacitor modelLSSeries inductanceRSSeries resistance , due to contacts (leads, sprayed metal and film metallization)RPParallel resistance , due to insulation resistanceCCapacitanceC, RSand LSare magnitudes that vary in the frequency domain (AC).

8 RPis a magnitude defined in DC ( insulation resistance ). Rated capacitance / measuring conditionsCapacitance is the amount of electrically charged carriers a capacitor can store per unit of volt-age. Therated capacitance CRof a capacitor is the value for which it is designed, and that is in-dicated on is measured under standard conditions to IEC 60068-1:2013. In case of doubt,stricter reference conditions are defined in sub-clause of the same conditionsStandard conditionsReferee conditionsTemperature15 .. 35 C(23 1) CRelative humidity45 .. 75%(50 2) %Ambient atmospheric.

9 Pressure86 .. 106 kPa86 .. 106 kPaFrequency1 kHz1 VR(max. 5 V) VR(max. 5 V)Prior to being measured, a capacitor must be stored under measuring conditions until the entirecapacitor has reached the measuring temperature and toleranceis the permissible relative deviation of the real capacitance from therated value, expressed in percent. The measuring conditions are the same as for the rated capac-itance. The codes for capacitance tolerance are defined in section "capacitor markings" (seepage). General technical informationPage9of41 Please readImportant notesandCautions and Variation of capacitance with temperatureCapacitance will undergo areversible changewithin a range of temperatures between the upperand lower category temperatures.

10 The gradient of the capacitance/temperature curve is given bythetemperature coefficient cof the capacitance, which is defined as the average capacitancechange, in relation to the capacitance measured at (20 2) C, occurring within the temperaturerange T1to T2. It is expressed in units of 10-6 measured at temperature T1C2 Capacitance measured at temperature T2C3 Reference capacitance measured at (20 2) CThe temperature coefficient is essentially determined by the properties of the dielectric, the ca-pacitor construction and the manufacturing parameters. Polypropylene Capacitors have negativetemperature coefficients, polyester Capacitors have positive temperature Temperature coefficient c10-6/K 250+600+200 Reversible changes of capacitance with temperature are usually expressed as C/C.


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