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February 18, 2017

Rated Current tsa KEMET Tantalum Capacitor

Hangata e hlokomolohuoa phepelo matla, khatello ea kelello ke input capacitance ( KEMET tantalum capacitor RMS jwale). Ha u sa e utloisise ka nepo, e le hona joale o tla etsa hore capacitance ( KEMET tantalum capacitor Overheating le ho hloleha pele ho nako). Ka Buck converter, sebedisa mo e ka nnang latelang, khumo jwale ya (io) le mosebetsi potoloho (D) ka balwa habonolo RMS:

Rated jwale KEMET tantalum capacitor


Figure 1 bontša mothinya ba ho hlahisa maikutlo e; e le chitja, eo e ileng ea 50%, e ile ea fihla palo e kahodimodimo ea 0.5 mosebetsi karo-karolelano, 'me mosebetsi karo-karolelano le 2 ka 0% le 100% ya lefela tšela. Mothinya ka 50% potoloho mosebetsi haufi setshwani. Pakeng tsa 20% le 80%, pakeng tsa RMS jwale le khumo jwale o moholo ho 80%. The tshebediso ya ho pharalla ha mosebetsi karo-karolelano, u ka le kakanyo feela e hakanya bakeng 1 / 2 RMS jwale lebetsoeng le khumo jwale. Ka ho pharalla ena, o lokela ho etsa hore bo manolotsoeng e lekanang.

Rated jwale KEMET tantalum capacitor

Ka Figure 1 1 / 2 khumo jwale ka input le capacitor RMS Buck tlhōrō jwale

Ka lilemo tse seng kae tse fetileng, tse peli tse ceramic capacitor bophahamo ba modumo bokgoni le theko e ile a hatela pele haholo. The capacitor ceramic e hona joale ba boemo itlhopheang ya phepelo matla bypass.However, bona tlaase ESR tla etsa hore e ngata ea mathata a, tse kang: EMI filthara ka matla oscillation le kotsi gagamalo ikutloe. E tšoanang (electrolytic capacitor KEMET tantalum capacitor ) Di atisa ho sebelisa ho thibela tsena Q. phahameng Maemong ana, o lokela ho lefa a lebisa tlhokomelo ho jwale ripple ka electrolyte, hobane phepelo matla ripple jwale tla qetella kena palo e khōlō ea capacitor electrolytic. Figure 2 bontša ka 100 kHz input capacitor switjha mohlala, input capacitance ke capacitor electrolytic ka e tšoanang le 10 uF ceramic capacitor, series hanyetsa le electrolytic capacitor nang 0.15 ohmic lekanang (ESR). A nka electrolytic capacitor capacitance feta capacitor ceramic, tabeng ena, RMS ka 70% ya jwale ka electrolyte ena. Ho fokotsa RMS jwale, o ka eketsa maqhubu kapa ceramic capacitor lekanang letoto lena ho hanyetsa (ESR). Ka ho sebelisa Fourier letoto la lihlooho tse capacitive jwale ka atamela ho mothinya ho a bale e mong le e tsamaellanang (ho fihlela ho 10) ya electrolytic capacitor jwale, palo yohle RMS jwale le boela motsoako oa manolotsoeng e tsamaellanang tsa capacitor electrolytic. Ka kōpo hlokomela hore ESR jwale le phapang ea ceramic capacitor 1 / 4 potoloho ka mohato, ka lebaka leo ba lokela ho nkoa e le vector. Haeba u ha ba batle ho qeta nako e ka dipalelo tsena, u ka etsa joalo ka ho ba mohloli jwale le dikarolo tse tharo etseng letho habonolo oa potoloho ketsiso.

Rated jwale KEMET tantalum capacitor


Figure 2 sebelisa mefuta e fapaneng ya capacitor capacitors electrolytic (ka kopo ela hloko hore KEMET tantalum capacitor hona joale)

Ka bokhutšoanyane, a lebisa tlhokomelo ho RMS jwale input capacitor, hobane khatello ea kelello e hona joale e tla fokotsa ho tšepahala ha capacitor. Kopantswe capacitor mofuta feta ba hloka tlhokomelo e khethehileng, hobane capacitors ceramic hangata ho dumella ripple gagamalo phahameng ho lekaneng ho e etsa li le boemong bo overcurrent ka e tšoanang electrolytic capacitor. The potso bothata rarolla mokhoa ke ho eketsa ngoe kapa tse eketsehileng tsa ho latelang: ho sebetsa maqhubu, palo, ceramic capacitor electrolytic capacitor ESR kapa RMS rated jwale.


Tse latelang ke tsoang teng tsa RMS input jwale ka capacitor, e leng nkuwa tsa bottom ke keng ba lekanngoa. The pulse length likhutlo li 'nè (D0.5 * Ipk) ya jwale RMS ka qalisang,' me tlosa DC motsoako (D * Ipk).

Rated jwale KEMET tantalum capacitor

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