Hauv kev hloov-mode fais fab mov (SMPS) tsim, cov khoom sib nqus, raws li cov khoom tseem ceeb ntawm lub zog hloov pauv, khaws cia, thiab kev cais tawm, sawv cev rau qhov kev sib tw tseem ceeb rau cov kws ua haujlwm feem ntau. Los ntawm hluav taws xob transformers thiab inductors mus rau sib nqus cores, qhov parameter sib txuam, kev tswj tsis tau, thiab kev sib xyaw tsim ntawm cov khoom sib nqus ncaj qha txiav txim siab qhov ua tau zoo, qhov loj me, thiab ruaj khov ntawm SMPS. Lawv txoj kev tsim teeb meem tau dhau los ua qhov tseem ceeb hauv kev txwv tsis pub SMPS kev ua tau zoo hloov kho dua tshiab.
Core poob thiab kub nce tswj yog cov teeb meem tseem ceeb hauv kev tsim cov khoom sib nqus. Electronic transformers thiab inductors nyob rau hauv SMPS feem ntau ua hauj lwm ntawm high zaus xws li kaum ntawm kHz mus rau ob peb MHz. Sib nqus cores yog nquag mus rau eddy tam sim no thiab hysteresis poob nyob rau hauv alternating magnetic teb, nrog losses ua tseem ceeb nyob rau hauv ntau dua frequencies. Qhov no tsis yog tsuas yog txo cov kev hloov pauv hluav taws xob tab sis kuj ua rau cov tub ntxhais kub siab tshaj plaws, cuam tshuam rau lub neej ntawm cov khoom siv semiconductor ib puag ncig. Cov tsoos silicon steel cores raug kev txom nyem los ntawm siab- zaus poob, thaum cov ferrite cores, txawm tias muaj kev poob qis, nws yog qhov ua rau muaj kev sib nqus saturation nyob rau hauv siab - kub thiab siab - lub zog. Ntsuas qhov poob, kub nce, thiab permeability dhau los ua qhov tseem ceeb tsim qhov mob.
Qhov tsis sib xws ntawm qhov loj thiab lub zog ntom ntom ntxiv ua rau qhov kev sib xyaw ua ke ntawm cov khoom sib nqus. Qhov kev thov rau miniaturization thiab lub teeb yuag tsim nyob rau hauv SMPS (Smart Power Supply System) yog nce ceev, thaum cov khoom sib nqus feem ntau suav txog 30% -50% ntawm tag nrho cov khoom siv fais fab. To improve power density, core size needs to be reduced and the number of winding turns simplified, but this leads to increased magnetic flux density and leakage inductance, resulting in excessive electromagnetic interference (EMI) and output ripple. Tshwj xeeb tshaj yog nyob rau hauv cov khoom siv hluav taws xob portable, ua tiav lub zog hloov pauv ntawm cov khoom sib nqus hauv qhov chaw me me, ntsuas qhov loj me thiab kev ua tau zoo, yog qhov nyuaj rau cov engineers.
Leakage inductance thiab EMI tswj yog cov teeb meem tseem ceeb rau kev hloov cov khoom sib nqus mus rau siab - zaus SMPS daim ntawv thov. Cov kev faib tawm thiab cov dej xau inductance ntawm cov hluav taws xob transformer windings tsim cov hluav taws xob sib nqus thiab cov chaw sib nqus sib nqus thaum lub sij hawm siab - zaus hloov, ua rau muaj kev ntxhov siab ntawm kev hloov khoom siv thiab ua rau EMI cuam tshuam, cuam tshuam rau SMPS kev ua raws thiab kev ruaj ntseg ntawm cov khoom siv peripheral. Tsis tas li ntawd, sib txawv SMPS topologies (flyback, rau pem hauv ntej, thiab lwm yam) muaj cov kev xav tau sib txawv heev rau kev xau inductance hauv cov khoom sib nqus. Kev ua kom zoo ntawm cov dej xau inductance los ntawm cov txheej txheem winding thiab shielding qauv tsim tau dhau los ua qhov kev sib tw tseem ceeb hauv siab - zaus SMPS tsim.
Cov phiaj xwm kev daws teeb meem tuaj yeem kov yeej cov teeb meem tsim qauv ntawm cov khoom sib nqus. Rau cov tub ntxhais xaiv, qis- poob manganese-zinc ferrite thiab amorphous alloy cores yog qhov nyiam rau siab- cov ntawv thov zaus, ua ke nrog kev tsim kho qhov sib nqus sib nqus tsim kom txo cov hlau nplaum saturation. Kev tswj tsis tau tuaj yeem ua tiav los ntawm ntu ntu winding, siv Litz hlau los txo qhov kev poob tam sim no, thiab suav cov lej ntawm kev faib tawm siv cov cuab yeej finite caij simulation. Hais txog qhov kev ua kom zoo, cov khoom sib nqus sib nqus (xws li kev sib xyaw ua ke transformers thiab inductors) tuaj yeem txo qhov chaw, thiab cov cuab yeej siv hluav taws xob tuaj yeem txhim kho lub zog ceev. Leakage inductance thiab EMI tswj tuaj yeem ua tiav los ntawm kev tiv thaiv kev tsim qauv, sib luag winding, thiab nqus hluav taws xob txhawm rau txhawm rau cuam tshuam kev cuam tshuam.
Tsis tas li ntawd, qhov sib xws thiab kev ntseeg tau tsim ntawm cov khoom sib nqus yog qhov tseem ceeb. Hauv kev tsim khoom loj, kev hloov pauv ntawm cov khoom siv tseem ceeb thiab kev sib txawv hauv cov txheej txheem winding tuaj yeem ua rau muaj kev ua haujlwm loj hauv cov khoom sib nqus, cuam tshuam rau batch stability ntawm SMPS. Los ntawm kev tswj hwm cov khoom tseem ceeb ntawm kev ua siab ntev, ua kom zoo dua cov cuab yeej siv hluav taws xob zoo, thiab khaws cia kom txaus qhov kub nce thiab sib nqus flux redundancy, lub sij hawm ntev - kev ntseeg siab ntawm cov khoom sib nqus tuaj yeem txhim kho, yoog raws li daim ntawv thov xav tau ntawm SMPS hauv ntau yam xwm txheej xws li cov khoom siv hluav taws xob, kev tswj hwm, thiab lub zog tshiab.