Series switching zog mov
Tom qab 220V AC mains tau kho thiab lim los ntawm CI, 300V DC voltage tau txais ntawm C (thaum lub mains voltage yog 220V, qhov siab tshaj plaws tus nqi tom qab rectification tuaj yeem ncav cuag 220√2V=311V, qhov twg 300V DC voltage hais txog tus nqi kwv yees), qhov voltage no yog Lub winding L1 yog xa mus rau lub collector ntawm lub raj hloov VT.
Lub teeb liab mem tes yog siv rau lub hauv paus ntawm lub raj hloov VT. Thaum cov theem siab ntawm cov teeb liab mem tes xa mus rau lub hauv paus ntawm VT, VT yog saturated thiab tig rau, thiab qhov voltage ntawm 300V yog them rau lub capacitor C2 los ntawm lub collector thiab emitter ntawm L1 thiab VT. Thaum cov nqi them tam sim no dhau los ntawm L1, L1 yuav ua rau sab laug zoo thiab sab xis tsis zoo electromotive quab yuam los thaiv qhov tam sim no, thiab L2 yuav ua rau sab laug zoo thiab txoj cai tsis zoo electromotive quab yuam ( tib lub npe davhlau ya nyob twg muaj tib lub polarity), lub freewheeling diode VD1 yog muab tua; Thaum cov theem qis ntawm cov teeb liab mem tes xa mus rau lub hauv paus ntawm VT, VT raug muab tua, tsis muaj tam sim no ntws los ntawm L1, L1 tam sim ntawd ua rau sab laug tsis zoo thiab txoj cai zoo electromotive quab yuam, thiab L2 induces sab laug tsis zoo thiab txoj cai zoo electromotive quab yuam. Electromotive quab yuam, diode VD1 qhib, thiab lub zog hluav taws xob ntawm L2 nqi C2.
Txoj kev them nyiaj yog: txoj cai zoo ntawm L2 → C2 → av → VD1 → sab laug tsis zoo ntawm L2, thiab qhov zoo thiab qis qis qis Uo raug them rau C los muab cov load RL. Cov txheej txheem tswj hluav taws xob: Yog tias qhov hluav taws xob tseem ceeb poob, qhov hluav taws xob hla C1 kuj yuav poob. Yog tias qhov dav dav ntawm VT lub hauv paus tseem tsis hloov pauv, thaum lub VT qhib, qhov them tam sim no yuav txo qis vim qhov poob ntawm cov khoom siv hluav taws xob. Qhov voltage U ntawm lub davhlau ya nyob twg yuav poob.
Txhawm rau kom ntseeg tau tias qhov hluav taws xob ntawm ob qho kawg ntawm C yuav tsis poob thaum lub mains voltage poob, lub teeb liab mem tes xa mus rau VT puag tuaj yeem nthuav dav (theem siab ntev ntev), VT conduction lub sij hawm ntev, Lub sijhawm them nyiaj C2 ntev ntev, thiab C2 qhov hluav taws xob hla ob qhov kawg nce rov qab mus rau qhov qub dua.
