Ob peb xyoos dhau los, ib tus kws tsim khoom siv hluav taws xob los ntawm cov teb chaws Asia tau xa lus ncaj qha rau peb:
"Peb pheej hloov pauv hloov pauv hloov pauv hloov pauv, tab sis peb cov khoom siv hluav taws xob 24V tseem overheats ntawm tag nrho cov khoom. Peb tsis nkag siab vim li cas."
Thaum cov qauv tuaj txog ntawm peb lub chaw kuaj mob, tsis muaj dab tsi zoo li tsis ncaj ncees lawm thaum xub thawj siab ib muag. Lub transformer yog qhov loj me me, tus nqi inductance sib phim rau tus qauv tsim, thiab lub voj voog topology yog tus qauv rau lub converter pem hauv ntej. Tab sis ib zaug peb muab tso rau hauv kev ntsuas kev thauj khoom tas mus li, qhov teeb meem tau pom tseeb hauv ob peb teev. Qhov kub nce siab dua li qhov xav tau, thiab qhov kev ua haujlwm nkhaus poob qis dua 70% load.
Lub transformer tsis yog "tsis ncaj ncees lawm" nyob rau hauv ib txwm kev xav. Nws tsuas yog tsis tsim los rau qhov kev ua haujlwm tiag tiag ntawm lub zog hluav taws xob.
Nov yog qee yam uas peb pom ntau zaus ntawm Wuxi Huipu Electronics Co., Ltd.
Cov engineers feem ntau twb paub txog qhov tseem ceeb ntawm kev hloov pauv hloov pauv: kev hloov pauv hluav taws xob, hloov hluav taws xob, thiab kev sib cais. Qhov kev sib tw tiag tiag yog tsis nkag siab tias nws ua li cas, tab sis nkag siab yooj yim npaum li cas nws qhov kev ua tau zoo hloov pauv thaum txawm tias qhov kev xav tsim me me tsis raug.
Thawj qhov yuam kev feem ntau pib nrog hloov zaus. Ntau tus neeg tsim qauv xav tias lub tshuab hloov hluav taws xob tsim los rau "zoo li lub zog theem" yog hloov pauv tau. Nyob rau hauv kev muaj tiag, ib tug transformer optimized rau 50kHz ua hauj lwm coj txawv kiag li ntawm 100kHz los yog 200kHz. Cov tub ntxhais poob nce ntxiv tsis yog-linearly, tooj liab poob coj txawv ntawm cov tawv nqaij, thiab cov dej xau inductance dhau los ua qhov tseem ceeb tshaj nyob rau hauv siab -kev hloov pauv ceev. Peb ib zaug tau ua haujlwm nrog cov neeg siv khoom nyob sab Europe uas tau sim rov siv qhov kev hloov pauv uas twb muaj lawm thoob plaws ob tiam neeg los ntawm kev kho dua tshiab IC maub los. Qhov tshwm sim yog qhov tso tawm tsis ruaj khov nyob rau hauv dynamic load tej yam kev mob, txawm tias lub zog ntsuas tsis tau hloov hlo li.
Lwm qhov teeb meem tshwm sim yog xaiv cov khoom siv tseem ceeb. Nyob rau hauv daim ntawv, ferrite cores yuav tshwm sim, tab sis nyob rau hauv tiag tiag engineering xyaum, txawv ferrite formulations coj txawv txawv nyob rau hauv qhov kub thiab txias. Lub transformer uas ua tau zoo nyob rau hauv chav tsev kub tej zaum yuav pib saturate los yog poob efficiency thaum lub tseem ceeb kub nce siab tshaj 90℃nyob rau hauv ib tug kaw muaj txee. Nyob rau hauv ib rooj plaub uas muaj cov chaw tsim khoom siv automation, qhov teeb meem tsuas yog tshwm sim nyob rau hauv lub caij ntuj sov ntau lawm ib puag ncig. Cov qauv kuaj lub caij ntuj no dhau tag nrho cov kev qhia tshwj xeeb, uas pib ua yuam kev hauv pab pawg engineering xav tias tus qauv tsim ruaj khov.
Winding qauv yog lwm qhov chaw uas muaj kev paub ntau dua li kev suav. Ntau cov ntaub ntawv transformer muab cov inductance thiab hloov pauv, tab sis lawv tsis tshua muaj kev cuam tshuam li cas lub zog ua tau zoo hauv cov qauv winding. Leakage inductance, parasitic capacitance, thiab winding layering txiav txim siab li cas lub transformer cuam tshuam nrog MOSFET hloov tus cwj pwm. Yog tias cov kev ntsuas no tsis raug tswj xyuas kom raug, qhov tshwm sim feem ntau yog qhov hluav taws xob nce siab, tus nqi ntxiv EMI lim dej, lossis kev ntxhov siab tsis xav txog ntawm kev hloov khoom siv. Peb tau pom cov qauv tsim qhov twg lub transformer yog technically "yog," tab sis lub Circuit Court nyob ib puag ncig yuav tsum tau redesigned ntau zaus los them rau kev hloov suab nrov.
Thermal design feem ntau underestimated mus txog rau thaum nws dhau los ua qhov tsis ua tiav. Tsis zoo li tsawg- zaus transformers, hloov fais fab mov transformers ua hauj lwm nyob rau hauv ib tug ntau ntau concentrated thermal ib puag ncig. Txawm tias qhov me me ntawm tooj liab poob tuaj yeem ua rau muaj qhov tsis sib haum xeeb hauv cov tub ntxhais kub vim tias cov cua sov dissipation txoj hauv kev txwv hauv cov khoom siv fais fab. Ib qho ntawm peb cov neeg siv khoom lag luam hauv lub teb chaws Yelemees thawj zaug sim daws cov cua sov los ntawm kev hloov kho MOSFETs thiab txhim kho airflow. Tsuas yog tom qab ntawd lawv tau pom tias lub tshuab hloov pauv nws tus kheej tau ua haujlwm sab nraud nws qhov zoo tshaj plaws thermal qhov rais vim qhov kev xav ntawm qhov ntsuas qhov ntsuas tau ua thaum ntxov tsim qauv.
EMI tus cwj pwm yog lwm qhov tseem ceeb uas feem ntau pom tau lig dhau lawm. Hauv kev hloov cov khoom siv hluav taws xob, lub tshuab hloov pauv tsis yog ib qho kev hloov pauv hluav taws xob xwb - nws kuj yog ib feem ntawm kev coj tus cwj pwm electromagnetic ntawm tag nrho lub voj voog. Tsis zoo winding symmetry, uncontrolled stray capacitance, los yog tsis raug shielding zoo yuav tig lub transformer mus rau hauv lub suab nrov uas cuam tshuam rau tag nrho cov system. Peb feem ntau qhia cov neeg siv khoom tias EMI tsis tshua muaj "kho" ntawm theem lim; nws feem ntau yog los ntawm kev tsim magnetic nws tus kheej.
Nyob rau ntawm lub sijhawm no, ntau tus engineers pib paub tias xaiv lub zog hloov pauv hloov pauv tsis yog qhov kev txiav txim siab yooj yim. Nws yog ib qhov system - theem optimization teeb meem nrog rau cov hluav taws xob kev ua tau zoo, thermal cwj pwm, mechanical constrictions, thiab manufacturing sib xws.
Qhov no yog qhov uas daim ntawv thov kev paub dhau los ua qhov tseem ceeb tshaj qhov kev qhia tshwj xeeb ntawm kev sib tw.
Ntawm Wuxi Huipu Electronics Co., Ltd., peb feem ntau pib xaiv transformer tsis yog nug "qhov kev ntsuas fais fab twg yog qhov xav tau," tab sis los ntawm kev nug seb lub hwj chim yuav siv tau li cas. Nruam load los yog tsis sib xws load, ambient kub ntau, enclosure tsim, airflow tej yam kev mob, switching topology, thiab efficiency expectations tag nrho cov cuam tshuam rau qhov kawg transformer tsim. Hauv ntau cov haujlwm OEM, kev txhim kho kev ua tau zoo tshaj plaws tsis yog los ntawm kev hloov cov khoom, tab sis los ntawm kev hloov kho cov qauv tsim kom zoo dua qhov kev ua haujlwm tiag tiag.
Nyob rau hauv kev xyaum, txoj cai switching fais fab mov transformer yog tsis tshua muaj ib tug uas yooj yim raws li hluav taws xob xam. Nws yog ib qho uas nyob ruaj khov tom qab teev tag nrho ntawm - kev ua haujlwm thauj khoom, nyob rau hauv kev ntxhov siab tiag tiag, hauv cov khoom siv tiag tiag, hauv qhov chaw muaj kev lag luam tiag.
Qhov ntawd feem ntau yog lub ntsiab lus uas tsim txoj kev xav xaus - thiab qhov tseeb engineering pib.