Hloov cov khoom siv hluav taws xob tau txais hluav taws xob cia los ntawm cov khoom siv hluav taws xob tso tawm
Ntawm qhov voltage-them kev sib raug zoo daim duab, lub capacitance yog qhia raws li ib tug kab pheeb ces kaum, thiab lub zog khaws cia nyob rau hauv lub capacitance yog lub cheeb tsam nyob rau hauv lub kab. Txawm hais tias cov zis capacitance ntawm lub hwj chim MOSFET yog nonlinear thiab txawv nyob ntawm qhov ntws voltage, lub zog khaws cia rau hauv cov zis capacitance tseem yog thaj av uas muaj nyob rau hauv cov kab nonlinear capacitance. Yog li ntawd, yog tias peb tuaj yeem nrhiav tau ib txoj kab ncaj nraim uas muab tib thaj chaw raws li thaj chaw uas muaj nyob rau hauv qhov sib txawv ntawm cov zis capacitance nkhaus qhia hauv FIG. 1, txoj kab nqes ntawm txoj kab yog raws nraim qhov sib npaug ntawm cov zis capacitance uas ua rau tib lub zog khaws cia.
Rau qee qhov kev siv thev naus laus zis qub MOSFETs, tus tsim qauv yuav tuaj yeem nrhiav qhov sib npaug ntawm cov khoom siv hluav taws xob uas siv lub nkhaus haum raws li cov txiaj ntsig ntawm cov khoom siv hluav taws xob hauv cov ntaub ntawv ntawm cov khoom siv hluav taws xob uas tau teev tseg ntawm 25V.
(3) Lub zog cia tuaj yeem tau txais los ntawm qhov sib npaug yooj yim.
(4) Thaum kawg, qhov ua tau zoo tso zis capacitance tau muab raws li
(5) Qhov ntsuas tus nqi ntawm cov zis capacitance thiab qhov haum nkhaus tau muab los ntawm Eq. (3) tau qhia. Nws ua haujlwm zoo nrog kev hwm rau cov qub thev naus laus zis MOSFETs. Txawm li cas los xij, rau MOSFETs siv cov thev naus laus zis tshiab xws li thev naus laus zis thev naus laus zis, qhov chaw tso zis muaj peev xwm muaj cov yam ntxwv tsis sib xws, qhov yooj yim exponential nkhaus haum qee zaum tsis zoo txaus. Daim duab 2(b) qhia tau hais tias qhov ntsuas cov zis capacitance ntawm ib * tshiab technology MOSFET thiab qhov haum nkhaus siv qhov sib npaug (3). Rau qhov sib npaug ntawm cov zis capacitance tus nqi, qhov sib txawv ntawm ob qho tib si hauv cheeb tsam high voltage ua rau muaj qhov sib txawv loj heev, vim tias qhov hluav taws xob sib npaug rau qhov capacitance hauv qhov sib npaug sib npaug. Kev kwv yees qhov sib npaug ntawm qhov sib npaug yuav ua rau muaj qhov muaj peev xwm loj dua, uas tuaj yeem ua yuam kev rau qhov pib tsim ntawm lub converter.
Output capacitance valuation, (a) qub MOSFET, (b) MOSFET tshiab
Yog hais tias qhov tso zis capacitance tus nqi sib txawv raws li qhov ntws-qhov hluav taws xob, lub zog khaws cia hauv cov zis capacitance tuaj yeem pom tau siv Equation (4). Txawm hais tias lub capacitance nkhaus tau qhia hauv cov ntaub ntawv, nws tsis yooj yim los nyeem tawm tus nqi capacitance. Yog li ntawd, raws li qhov ntws-qhov hluav taws xob, lub zog khaws cia hauv qhov tso zis hluav taws xob yog muab los ntawm daim duab hauv cov ntaub ntawv MOSFET lub zog kawg. Siv qhov nkhaus qhia hauv daim duab 3, qhov sib npaug ntawm cov zis capacitance ntawm qhov xav tau ncaj qha tam sim no (DC) lub npav hluav taws xob tuaj yeem tau txais siv Equation (5).
