Yuav ua li cas koj tus kheej excite ib series-hom switching fais fab mov los ntawm nws tus kheej
Self-excited switching fais fab mov raws li cov tswv yim thiab tso zis kev twb kev txuas yuav muab faib ua series (step-down non-isolated), parallel (step-up non-isolated) thiab transformer-coupled (isolated). Nyob rau hauv lub transformer-coupled nws tus kheej-excited switching fais fab mov, raws li kev twb kev txuas ntawm lub switching tube yuav muab faib mus rau hauv ib tug tib raj, thawb-rub thiab choj hom. Txij li thaum tus kheej-excited parallel hom belongs rau hom boost, kev siv tswv yim tsis tshua muaj.
General AC thiab DC hloov dua siab tshiab ntawm tus kheej zoo siab series-hom thiab transformer-coupled switching fais fab mov daim ntaub ntawv.
Self-excited series hom switching fais fab mov txoj cai ntawm kev ua hauj lwm
Self-excited series-type switching power supply yog ib qho kev siv thaum ntxov ntawm kev hloov hluav taws xob, vim yog lub raj xa hluav taws xob, lub zog cia inductance thiab cov khoom thauj hauv series, qhov tso zis hluav taws xob qis dua qhov hluav taws xob input, tseem hu ua step-down. non-transformer-coupled switching fais fab mov.
Self-excited series-coupled switching fais fab mov qauv schematic daim duab. C1, Cz yog input voltage U1 thiab tso zis voltage U2 lim capacitors; switching tube VT nrog A switching cim analogue hloov, L rau lub zog cia inductor, VD rau lub continuity diode, C3 series kev twb kev txuas ntawm R1 yog generated switching transistor puag b, muab high-zaus conduction los yog cutoff mov txoj kev.
Qhov no yog daim ntawv yooj yim tshaj plaws ntawm series-hom switching fais fab mov, nkag siab lub hauv paus ntsiab lus ntawm kev ua haujlwm, tuaj yeem yooj yim saib ntawm lwm cov khoom siv hluav taws xob kuj muaj cov qauv ntsuas hluav taws xob, qhov siv hluav taws xob, kev sib piv amplifier thiab mem tes dav amplifier. voltage siv, sib piv amplification thiab mem tes dav modulation circuitry. Daim duab ntawm ib qho yooj yim tus kheej-zoo siab rau tus kheej-excited switching Circuit Court, nws yog siv lub Circuit Court ntawm VT switching tube mem tes transformer L yog ib tug self-excited oscillator kom tiav lub hwj chim mov pib-up ua hauj lwm, thiaj li hais tias lub hwj chim mov muaj DC voltage tso zis.
Ntawm no kuv coj 220V AC raws li cov tswv yim rau lub hwj huam mov input U1.
220V AC los ntawm tus choj rectifier los yog ib-theem ib nrab-yoj rectifier, choj rectifier efficiency ntawm 0.9, ib nrab-yoj rectifier efficiency ntawm 0.45, rectified los ntawm C1 lim tawm ntawm txog 280 VDC. Tom qab rectification, DC voltage ntawm txog 280 V yog lim los ntawm C1 thiab tso tawm tag nrho txoj kev los ntawm cov thawj winding ntawm L mus rau lub collector ntawm lub switching raj VT; lwm txoj kev los ntawm qhov pib capacitor C3 thiab series pib tam sim no limiting resistor R1 mus rau lub hauv paus ntawm switching tube los muab kev tsis ncaj ncees tam sim no rau VT. Lwm txoj kev los ntawm qhov pib capacitor C3 thiab series pib tam sim no limiting resistor R1 los muab kev tsis ncaj ncees tam sim no rau lub hauv paus ntawm VT hloov raj, kom VT ua haujlwm sai heev, thawj winding nyob rau hauv L generates induced voltage, los ntawm peb lub taub hau. coils ntawm L, ua ke rau cov lus pom zoo winding, thiab muab tso rau qhov induced voltage yog pub rov qab mus rau lub hauv paus ntawm VT, ua rau VT nkag mus rau hauv saturation conduction xeev.
Thaum VT saturation, vim hais tias lub collector tam sim no tseem tsis hloov, qhov voltage ntawm thawj winding ploj, VT tawm ntawm saturation, lub collector tam sim no txo, lub tswv yim winding tsim ib tug rov qab voltage, thiaj li hais tias VT Reverse bias txiav tawm. Yog li rov qab ntau zaus, kev txiav tawm ntawm tus kheej zoo siab oscillation. Txuas mus rau L thawj winding ntawm lub tiam thib ob ntawm high-frequency mem tes voltage ncaj qha los ntawm lub hloov emitter e Output mus rau lwm yam loads, tab sis nyob rau hauv thiaj li yuav ua rau cov zis DC voltage nyob rau hauv lub ripple coefficient yog me me, nyob rau hauv lub Circuit Court thiab ntxiv ib tug electrolytic. capacitor Cz dua lim. Cov zis voltage yog qhov load resistor (Cz) ntawm qhov hloov. DC voltage.
