Cov yam ntxwv ntawm Tib Chip Switching Power Supply
(1) Cov khoom siv sab hauv ntawm TopSwitch II muaj xws li oscillator, yuam kev amplifier, mem tes dav modulator, rooj vag Circuit Court, high-voltage power switching transistor (MOSFET), bias circuit, overcurrent tiv thaiv Circuit Court, overheat tiv thaiv thiab lub hwj chim ntawm reset circuit, thiab kaw. / tsis siv neeg rov pib Circuit Court. Nws cais tawm tag nrho cov zis kawg ntawm daim phiaj hluav taws xob los ntawm lub tshuab hluav taws xob ntau zaus, ua rau nws muaj kev nyab xeeb siv. Nws belongs rau tam sim no tswj switching fais fab mov nrog qhib tso zis. Vim yog siv CMOS circuits, lub zog siv ntawm lub cuab yeej txo qis.
(2) Tsuas muaj peb qhov tso zis tawm: tswj lub davhlau ya nyob twg C, qhov chaw ncej S, thiab ntws ncej D, uas tuaj yeem muab piv rau peb lub davhlau ya nyob twg linear regulator thiab tuaj yeem tsim lub flyback hloov hluav taws xob yam tsis muaj lub zog zaus transformer hauv txoj kev yooj yim tshaj plaws. . Txhawm rau ua tiav ntau yam kev tswj hwm, kev tsis ncaj ncees, thiab kev tiv thaiv kev ua haujlwm, ob qho tib si C thiab D koom ua ke rau cov khoom siv hluav taws xob ntau, ua tiav ib ko taw rau ntau lub hom phiaj. Siv qhov kawg tswj raws li piv txwv, nws muaj peb lub luag haujlwm: ① Lub zog hluav taws xob VC ntawm qhov kawg no muab kev tsis ncaj ncees rau cov khoom siv hluav taws xob sib luag thiab lub rooj vag tsav theem; ② IC tam sim no ntawm qhov kawg no tuaj yeem kho lub voj voog ua haujlwm; ③ Qhov kawg no kuj tseem ua haujlwm raws li qhov sib txuas ntawm cov khoom siv hluav taws xob thiab lub tshuab hluav taws xob tsis siv neeg rov pib dua / nyiaj npib capacitor, thiab txiav txim siab qhov zaus ntawm tsis siv neeg rov pib dua los ntawm lwm lub bypass capacitor, thiab them nyiaj rau kev tswj xyuas Circuit Court.
(3) Qhov ntau ntawm input AC voltage yog qhov dav heev. Thaum siv cov khoom siv hluav taws xob ruaj khov, 220V ± 15% AC fais fab tuaj yeem xaiv tau. Yog tias nruab nrog lub zog AC nrog ntau yam ntawm 85-265V, qhov siab tshaj plaws tso zis hluav taws xob yuav tsum raug txo los ntawm 40%. Lub input zaus ntau ntawm lub zog hloov pauv yog 47-440Hz.
Tus nqi ntawm qhov hloov zaus yog 100KHz, thiab qhov kev hloov pauv ntawm lub luag haujlwm yog 1.7% txog 67%. Lub zog ua haujlwm yog nyob ib ncig ntawm 80%, nrog rau qhov siab tshaj plaws ntawm 90%, uas yog ze li ob npaug ntawm cov kab hluav taws xob sib xyaw ua ke. Nws qhov ntsuas kub ua haujlwm yog 0-70 degree , thiab qhov kub siab tshaj plaws ntawm cov nti yog Tjm =135 degree .
(5) Lub hauv paus ntsiab lus ntawm kev ua haujlwm ntawm TopSwitch II yog siv cov lus tawm tswv yim tam sim no IC los kho lub luag haujlwm D thiab ua tiav qhov hluav taws xob ruaj khov. Piv txwv li, thaum cov zis hluav taws xob VOT ntawm lub zog hloov hluav taws xob yog tshwm sim los ntawm qee qhov laj thawj, qhov yuam kev voltage Vrt D ↓ Vo ↓ tau khaws cia tas li los ntawm optocoupler tawm tswv yim circuit, ua kom Vo tsis hloov. Qhov ntxeev kuj muaj tseeb.
(6) Lub peripheral Circuit Court yog qhov yooj yim thiab tus nqi qis. Sab nraud, tsuas yog cov lim lim rectifier, lub tshuab hluav taws xob ntau zaus, cov kev tiv thaiv thawj zaug, cov lus tawm tswv yim, thiab cov khoom siv hluav taws xob yuav tsum tau txuas nrog. Kev siv cov chips no tuaj yeem txo qhov cuam tshuam ntawm electromagnetic cuam tshuam los ntawm kev hloov cov khoom siv hluav taws xob.
