Qhov zaus hloov pauv ntawm lub transformer siab dua, qhov ntim me dua. Yog li, nws puas txhais tau tias tsis muaj qhov txwv siab tshaj plaws rau qhov zaus hloov pauv? Yog li, qhov ntim puas tuaj yeem me heev?
Cov lus teb yog tsis zoo. Hauv cov txheej txheem ua haujlwm tiag tiag, qhov zaus ntawm cov transformers siab zaus yog txiav txim siab los ntawm ntau yam thiab tuaj yeem faib ua ntau yam:
1, Circuit topology flyback topology: Transformers muaj cov haujlwm ntawm kev khaws cia lub zog thiab kev hloov pauv, nrog rau kev siv zaus ua haujlwm feem ntau ntawm 40-100kHz. Thaum lub zaus qis dua 40kHz, qhov ntim ntawm cov hlau tub ntxhais loj dhau, ua rau muaj qhov ntim khoom siv hluav taws xob loj dua; Thaum lub zaus tshaj 100kHz, qhov hluav taws xob nce siab los ntawm kev xau inductance yuav ua rau lub transistor hloov pauv puas tsuaj.
Pem Hauv Ntej Topology: Qhov ntau thiab tsawg yog 60-150kHz, tab sis nws yuav tsum tau sib npaug ntawm qhov poob ntawm lub hauv paus sib nqus thiab qhov poob ntawm qhov hloov pauv. Push rub / ib nrab choj / tag nrho choj topology: Symmetrical switch driven bidirectional magnetized magnetic core, ua haujlwm tau zoo dua, txhawb nqa cov zaus siab dua xws li ntau pua kHz mus rau MHz, tab sis xav tau kev tswj hwm tsim thiab cua sov dissipation ntau dua.
2, Cov yam ntxwv ntawm cov khoom siv hlau nplaum muaj xws li kev poob magnetic hysteresis thiab kev poob eddy tam sim no. Hauv qee qhov ntau thiab tsawg, kev poob magnetic core nce nrog rau kev nce zaus. Yog li ntawd, cov khoom siv hlau nplaum sib txawv yuav tsum muaj ntau zaus siv sib txawv kom ntseeg tau tias kev poob magnetic core qis dua. Piv txwv li, manganese zinc ferrite yog qhov tsim nyog rau kev siv ntawm cov zaus ntau ntawm 10 txog 300kHz, thaum nickel zinc ferrite yog qhov tsim nyog rau kev siv ntawm cov zaus siab dua 1MHz.
Qhov thib ob, thaum lub zaus nce ntxiv, qhov siab tshaj plaws ntawm qhov sib nqus induction intensity yuav tsum tau txo kom tsis txhob muaj qhov saturation ntawm lub magnetic core. Piv txwv li, qhov sib nqus induction intensity ntawm DMR40 yog 0.38T, thiab thaum tsim ntawm qhov zaus ntawm 100KHz, peb feem ntau coj tus nqi ntawm ib ncig ntawm 0.2T.
3, Lub zog hloov pauv ceev ntawm MOS transistor yog cov khoom siv unipolar, nrog lub sijhawm qhib-tawm hauv nanoseconds. Lub sijhawm ua haujlwm theoretical tuaj yeem ncav cuag MHz, thiab qhov siab tshaj plaws ua haujlwm zaus yog ntau pua KHz. IGBT yog cov khoom siv bipolar, nrog lub sijhawm kaw ntev thiab qhov siab tshaj plaws ua haujlwm zaus feem ntau ntawm 40 ~ 50KHz.
4. Kev ua haujlwm zoo dua thiab zaus cua sov ua rau muaj kev poob ntawm qhov hloov thiab tsav tsheb, ua rau kev ua haujlwm zoo dua thiab kev tsim cua sov ntau dua. Yuav kom ntseeg tau tias qhov kub ntawm cov khoom nyob hauv qhov ib txwm muaj, peb xav tau ntau txoj kev ntsuas los daws qhov cua sov.
5. Thaum siv cov zaus siab, tus nqi yuav nce ntxiv vim muaj kev poob ntawm cov hloov pauv, ua rau yuav tsum muaj ntau txoj kev los daws qhov teeb meem ntawm kev tso cua sov tawm, ua rau tus nqi yuav nce ntxiv. Qhov thib ob, cov capacitors thiab inductors feem ntau yuav ua rau kev ua haujlwm tsis zoo thaum siv cov zaus siab, thiab peb yuav tsum xaiv cov khoom siv uas haum rau cov zaus siab dua, uas ua rau tus nqi yuav nce ntxiv. Hauv kev tsim qauv, tus nqi yuav tsawg, uas feem ntau yuav txiav txim siab qhov txwv siab tshaj plaws ntawm kev ua haujlwm zaus.
6, Cov yam ntxwv ntawm cov chips: Cov chips tswj PWM feem ntau muaj qhov yuav tsum tau ua kom muaj qhov siab tshaj plaws ntawm zaus kom teb tau rau kev hloov kho dynamic load. Qhov no kuj txiav txim siab tias qhov zaus hloov pauv ntawm lub transformer yog nyob rau hauv ib qho ntau yam.
Lub sijhawm tshaj tawm: Lub Yim Hli-06-2025
