Tsim cov kev xav tau rau ib leeg-chip switching fais fab mov circuits
(1) Lub tswv yim Circuit Court ntawm TopSwitch II yuav tsum tau nruab nrog lub optocoupler thiab cais tawm ntawm qhov tso zis hluav taws xob. Thaum tsim ib qho kev hloov pauv hloov hluav taws xob, qhov hloov kho TL431 precision correlation voltage regulator yuav tsum tau ntxiv los ua ib qho kev ua yuam kev sab nraud los hloov qhov voltage regulator hauv qhov piv txwv. Tus nqi hloov pauv voltage Sv thiab tam sim no hloov pauv tus nqi Sl ntawm precision hloov fais fab mov tuaj yeem ncav cuag li ± 0.2%, uas yog ze rau cov ntsuas ntawm cov kab hluav taws xob sib xyaw ua ke kom ruaj khov fais fab mov.
(2) Optocouplers nrog cov kev hloov pauv hloov pauv tam sim no (CTR) yuav tsum tau xaiv, xws li pC817A, NEC2501, 6N137, thiab lwm yam. Nws tsis pom zoo kom siv 4N × × hom zoo tib yam optocouplers xws li 4N25 thiab 4N35. Qhov tsis zoo linearity ntawm lub tom kawg tuaj yeem ua rau muaj kev cuam tshuam thaum xa cov cim analog, cuam tshuam rau qhov kev ua haujlwm ruaj khov ntawm qhov hloov hluav taws xob.
(3) Lub hauv paus ntawm lub high-frequency transformer yuav tsum tau nruab nrog ib tug tiv thaiv Circuit Court kom nqus lub ncov voltage tshwm sim los ntawm leakage inductance thiab xyuas kom meej tias MOSFET tsis puas. Qhov kev tiv thaiv Circuit Court no yuav tsum tau txuas mus rau qhov sib npaug ntawm lub hauv paus, nrog rau plaub lub tswv yim tsim tshwj xeeb: ① lub clamp Circuit Court tsim los ntawm cov hluav taws xob hluav taws xob hloov hluav taws xob (TVS) thiab ultra ceev rov qab diodes (SRD); ② Lub clamp Circuit Court tsim los ntawm TVS thiab silicon rectifier (VD); ③ Ib qho kev nqus hluav taws xob tsim los ntawm cov khoom tiv thaiv thiab cov khoom siv hluav taws xob thiab SRD; ④ Ib qho kev nqus hluav taws xob tsim los ntawm cov khoom tiv thaiv thiab cov khoom siv hluav taws xob thiab VD. Ntawm cov txheej txheem saum toj no, cov txiaj ntsig ntawm ① yog qhov zoo tshaj plaws, uas tuaj yeem ua kom muaj txiaj ntsig zoo ntawm TVS cov lus teb ceev heev thiab muaj peev xwm tiv taus lub zog siab hloov pauv pulses. Npaj 2 los thib ob.
(4) Cov khoom siv hluav taws xob tsim nyog yuav tsum tau ntxiv thaum siv cov chips. Rau TO-220 ntim, nws tuaj yeem ntsia ncaj qha rau ntawm cov laug cam me me. Rau DIp -8 thiab SMD-8 ntim, plaub qhov hluav taws xob tuaj yeem raug soldered mus rau cov ntawv ci tooj liab ntawm lub rooj tsav xwm luam tawm nrog thaj tsam ntawm 2.3 es tsis txhob siv cov cua sov.
(5) Txhawm rau txhawm rau cuam tshuam kev cuam tshuam los ntawm daim phiaj hluav taws xob thiab tiv thaiv kev cuam tshuam los ntawm kev hloov cov khoom siv hluav taws xob los ntawm kev xa mus rau sab nraud, nws yog ib qho tsim nyog yuav tsum tau ntxiv cov lim dej electromagnetic cuam tshuam (EMI filter), tseem hu ua lub suab nrov lim (pNF) , nyob rau hauv qhov kawg ntawm lub hwj chim mov.
(6) Thaum siv cov chips zoo li no, cov hlau lead yuav tsum luv li sai tau. Txhawm rau kom ntseeg tau tias cov zis hluav taws xob ruaj khov thaum tsis muaj kev thauj khoom lossis lub teeb thauj khoom, lub resistor ntawm ntau pua ohms yuav tsum tau txuas nrog cov khoom siv hluav taws xob ntawm qhov hluav taws xob hluav taws xob raws li qhov tsawg kawg nkaus load, los yog qhov voltage regulator tuaj yeem txuas nrog tib lub sijhawm.
