Kodi mayamwidwe a coefficient of film capacitors amatanthauza chiyani?Kodi chaching'ono ndi chabwino?

Tisanatchule coefficient mayamwidwe a filimu capacitor, tiyeni tione chimene ndi dielectric, polarization wa dielectric ndi mayamwidwe chodabwitsa capacitor.

Dielectric

Dielectric ndi chinthu chosagwiritsa ntchito, mwachitsanzo, insulator, yopanda ndalama yamkati yomwe imatha kuyenda. pansi pa mphamvu ya magetsi, koma osati "macroscopic movement" kutali ndi atomu yomwe iwo ali, monga ma elekitironi aulere mu kondakitala.Pamene electrostatic equilibrium ifika, mphamvu yamunda mkati mwa dielectric si zero.Uku ndiye kusiyana kwakukulu pakati pa mphamvu zamagetsi za dielectrics ndi ma conductor.

Dielectric polarization

Pansi pa zomwe zimagwiritsidwa ntchito pamagetsi, mphindi yayikulu ya dipole imawonekera mkati mwa dielectric motsatira njira yamagetsi, ndipo chiwongolero chomangika chimawonekera pamtunda wa dielectric, womwe ndi polarization ya dielectric.

Chochitika cha mayamwidwe

kuchedwa kwa nthawi mu kuthamangitsa ndi kutulutsa capacitor chifukwa cha kusinthasintha kwapang'onopang'ono kwa dielectric pansi pa ntchito yamagetsi ogwiritsidwa ntchito.Chidziwitso chodziwika bwino ndikuti capacitor imayenera kulipira mokwanira nthawi yomweyo, koma sichimadzazidwa nthawi yomweyo;capacitor ikufunika kuti itulutse chiwongoladzanja chonse, koma sichimasulidwa, ndipo nthawi yotsalira imachitika.

Mayamwidwe coefficient of film capacitor

Mtengo womwe umagwiritsidwa ntchito pofotokoza zochitika za dielectric mayamwidwe a filimu capacitors amatchedwa absorption coefficient, ndipo amatchulidwa ndi Ka.Mphamvu ya mayamwidwe a dielectric ya ma capacitor a filimu imatsimikizira kutsika kwafupipafupi kwa ma capacitor, ndipo mtengo wa Ka umasiyana kwambiri ndi ma dielectric capacitor osiyanasiyana.Zotsatira za muyeso zimasiyana nthawi zosiyanasiyana zoyesa za capacitor yomweyo;mtengo wa Ka umasiyananso ndi ma capacitor amtundu womwewo, opanga osiyanasiyana, ndi magulu osiyanasiyana.

Ndiye pali mafunso awiri tsopano-

Q1.Kodi mayamwidwe a coefficient of film capacitor ndi ochepa momwe ndingathere?

Q2.Zotsatira zoyipa za coefficient yokulirapo ya mayamwidwe ndi chiyani?

A1:

Pansi pa mphamvu yamagetsi yomwe imagwiritsidwa ntchito: yaing'ono Ka (kagawo kakang'ono kakang'ono koyamwa) → kufowoka kwa dielectric (ie insulator) → kutsitsa mphamvu yomangirira pamtunda wa dielectric → kufooka kwamphamvu kwa mayamwidwe a capacitor → capacitor imalingitsa ndikutulutsa mwachangu.Chikhalidwe choyenera: Ka ndi 0, mwachitsanzo, mayamwidwe apakati ndi 0, dielectric (ie insulator) ilibe polarization phenomenon pansi pa ntchito yamagetsi ogwiritsidwa ntchito, dielectric surface ilibe mphamvu yomangiriza pamoto, ndi capacitor charge ndi kuyankha kuyankha. alibe hysteresis.Chifukwa chake, coefficient yoyamwa ya filimu capacitor ndiyocheperako bwino.

A2:

Zotsatira za capacitor yokhala ndi mtengo waukulu kwambiri wa Ka pamabwalo osiyanasiyana amawonekera mosiyanasiyana, motere.

1) Zozungulira zosiyanasiyana zimakhala zozungulira zolumikizana

2) Dera la sawtooth limapangitsa kubwereranso kwa mafunde a sawtooth, motero dera silingathe kuchira msanga.

3) Malire, zomangira, zopapatiza kugunda linanena bungwe waveform kupotoza

4) Nthawi yokhazikika ya fyuluta yosalala yotsika kwambiri imakhala yayikulu

(5) DC amplifier zero point imasokonekera, kuyenda kwanjira imodzi

6）Kulondola kwa sampuli ndi kugwirizira dera kumachepa

7) Drift of DC malo opangira amplifier

8) Kuchulukirachulukira mumayendedwe operekera magetsi

Ntchito zonse zomwe zili pamwambapa za dielectric mayamwidwe ndizosasiyanitsidwa ndi chiyambi cha "inertia" ya capacitor, ndiye kuti, munthawi yomwe yaperekedwa sikulipidwa pamtengo womwe ukuyembekezeredwa, komanso kutulutsa komwe kulinso.

Kukaniza kwa insulation (kapena kutayikira) kwa capacitor yokhala ndi mtengo wokulirapo wa Ka ndi kosiyana ndi kokwanira bwino (Ka = 0) chifukwa kumawonjezeka ndi nthawi yayitali yoyesera (kutsika kwaposachedwa kumachepa).Nthawi yoyeserera yomwe yatchulidwa ku China ndi mphindi imodzi.