High-Frequency Switching Power Supply Txoj Cai
Main Circuit Court
Tag nrho cov txheej txheem ntawm kev tawm tswv yim thiab tso tawm los ntawm AC lub zog hluav taws xob, suav nrog:
1. Input filter: Nws muaj nuj nqi yog lim tawm cov clutter tam sim no nyob rau hauv lub hwj chim daim phiaj, thaum tseem hindering lub tswv yim ntawm clutter generated los ntawm lub tshuab mus rau pej xeem lub hwj chim daim phiaj.
2. Rectification thiab filtering: ncaj qha rectifying AC zog daim phiaj rau smoother DC fais fab mov rau theem tom ntej ntawm transformation.
3. Inversion: Transforming rectified direct tam sim no mus rau high-frequency alternating tam sim no, uas yog ib feem ntawm high-frequency. Qhov siab dua qhov zaus, qhov sib piv ntawm qhov ntim me me, qhov hnyav rau cov zis hluav taws xob.
4. Tso zis rectification thiab filtering: Muab ruaj khov thiab txhim khu kev qha DC fais fab mov raws li qhov yuav tsum tau ua.
tswj Circuit Court
Ntawm ib sab, cov qauv raug coj los ntawm qhov kawg tso zis, piv nrog cov qauv txheej txheem, thiab tom qab ntawd lub inverter yog tswj los hloov nws cov zaus los yog mem tes dav kom ua tiav cov zis ruaj khov. Ntawm qhov tod tes, raws li cov ntaub ntawv muab los ntawm kev ntsuas Circuit Court thiab txheeb xyuas los ntawm kev tiv thaiv Circuit Court, tswj Circuit Court yog muab los muab ntau yam kev tiv thaiv kev ntsuas rau tag nrho lub tshuab.
Kev kuaj xyuas Circuit Court
Ntxiv nrog rau kev muab ntau yam kev khiav hauj lwm tsis nyob rau hauv kev tiv thaiv Circuit Court, nws kuj muab ntau yam kev ntsuas cov ntaub ntawv.
Pab txhawb zog
Muab cov khoom siv hluav taws xob sib txawv rau txhua lub voj voog ib leeg. Lub hauv paus ntsiab lus ntawm kev hloov hluav taws xob tswj hluav taws xob yog qhov hloov K rov ua dua thiab tawm ntawm qee lub sijhawm. Thaum hloov K yog qhib, input fais fab E yog muab rau lub load RL los ntawm kev hloov K thiab lim Circuit Court. Thaum lub sijhawm hloov pauv tag nrho, lub zog E muab lub zog rau lub nra; Thaum hloov K yog muab tua, cov khoom siv hluav taws xob nkag E cuam tshuam cov khoom siv hluav taws xob. Nws tuaj yeem pom tias cov khoom siv hluav taws xob input muab lub zog rau cov khoom thauj tsis tu ncua. Txhawm rau kom cov khoom thauj tau txais cov khoom siv hluav taws xob tas mus li, qhov hloov hluav taws xob tswj hluav taws xob yuav tsum muaj cov khoom siv hluav taws xob cia. Thaum lub tshuab hluav taws xob tau qhib, ib feem ntawm lub zog yog khaws cia, thiab thaum lub tshuab hluav taws xob raug kaw, nws raug tso tawm mus rau lub nra. Lub voj voog tsim los ntawm inductor L, capacitor C2, thiab diode D hauv daim duab muaj cov haujlwm no. Inductance L yog siv los khaws lub zog. Thaum lub tshuab hluav taws xob raug txiav tawm, lub zog khaws cia hauv inductance L raug tso tawm mus rau lub load los ntawm diode D, tso cai rau lub load kom tau txais lub zog tas mus li thiab ruaj khov. Vim tias diode D ua rau cov load tam sim no tsis tu ncua, nws hu ua freewheeling diode. Qhov nruab nrab qhov hluav taws xob EAB ntawm AB tuaj yeem sawv cev los ntawm cov qauv hauv qab no: EAB=TON / T * E. Hauv cov qauv, TON yog lub sijhawm hloov pauv txhua lub sijhawm, thiab T yog lub voj voog ua haujlwm ntawm qhov hloov pauv ntawm / tawm (piv txwv li qhov suav ntawm qhov hloov ntawm lub sijhawm TON thiab lub sijhawm tawm TOFF). Raws li tuaj yeem pom los ntawm cov qauv, kev hloov pauv hloov ntawm lub sijhawm thiab lub voj voog ua haujlwm kuj hloov qhov nruab nrab voltage ntawm AB. Yog li ntawd, cia li kho qhov piv ntawm TON thiab T nrog kev hloov pauv hauv kev thauj khoom thiab cov khoom siv hluav taws xob hluav taws xob tuaj yeem tswj cov zis voltage V0 tsis hloov. Hloov lub sij hawm TON thiab lub luag hauj lwm lub voj voog piv, tseem hu ua hloov lub voj voog ua haujlwm pulse, yog ib txoj hauv kev hu ua Time Ratio Control (TRC).
