Expounding sab nraud cuam tshuam ntawm Switching Power Supply
Kev cuam tshuam sab nraud ntawm kev hloov hluav taws xob tuaj yeem muaj nyob hauv "hom hom" lossis "hom txawv". Hom kev cuam tshuam tuaj yeem sib txawv los ntawm lub sijhawm luv luv ntawm kev cuam tshuam los ua kom tiav lub zog poob. Nws kuj suav nrog kev hloov pauv voltage, zaus hloov pauv, waveform distortion, tsis tu ncua suab nrov lossis clutters thiab transients.
Cov hluav taws xob nrawm nrawm nrawm thiab surge shock yoj yog lub hauv paus tseem ceeb uas tuaj yeem xa los ntawm cov khoom siv hluav taws xob thiab ua rau cov khoom puas tsuaj lossis cuam tshuam rau nws txoj haujlwm. Ntev npaum li cov khoom siv hluav taws xob nws tus kheej tsis tso tseg kev vibration thiab tso zis hluav taws xob poob, kev cuam tshuam xws li electrostatic paug yuav tsis cuam tshuam rau cov khoom siv hluav taws xob los ntawm lub zog hluav taws xob.
Kev hloov hluav taws xob hloov hluav taws xob: Lub zog hloov hluav taws xob yog lub hauv paus ntawm kev hloov hluav taws xob tswj hluav taws xob, uas muaj cov khoom siv dav dav thiab cov nplua nuj harmonics. Cov khoom tseem ceeb uas ua rau qhov kev cuam tshuam pulse no yog:
1) Muaj kev faib tawm ntawm lub raj hloov thiab nws lub tshuab hluav taws xob, lub plhaub thiab cov hlau lead hauv lub zog. Thaum lub raj hloov pauv ntws nrog cov mem tes ntau dhau (feem ntau yog lub voj voos), lub waveform muaj ntau yam khoom siv siab; Nyob rau tib lub sijhawm, cov cuab yeej siv tsis tau siv rau hauv kev hloov hluav taws xob, xws li lub sijhawm cia ntawm lub hwj chim hloov lub raj, lub siab tam sim no ntawm cov zis theem thiab lub sij hawm rov qab los ntawm lub switching rectifier diode, yuav ua rau lub voj voog. luv-circuited instantly, ua rau ib tug loj luv luv tam sim no. Tsis tas li ntawd, lub load ntawm lub switching tube yog ib tug high-frequency transformer los yog lub zog cia inductor, thiab thaum lub sij hawm thaum lub switching tube yog qhib, ib tug loj inrush tam sim no tshwm nyob rau hauv lub hauv paus ntawm lub transformer, uas ua rau lub ncov lub suab nrov.
2) Lub transformer nyob rau hauv lub switching fais fab mov ntawm high-frequency transformer yog siv rau kev rho tawm thiab kev hloov pauv, tab sis vim yog to hauv inductance, nws yuav tsim hluav taws xob induced suab nrov; Nyob rau tib lub sij hawm, nyob rau hauv lub siab zaus, lub faib capacitance ntawm transformer txheej yuav hloov lub siab-order harmonic suab nrov ntawm thawj sab mus rau theem nrab, thiab lub faib capacitance ntawm lub transformer mus rau lub plhaub tsim lwm txoj kev high-frequency, uas ua electromagnetic teb generated nyob ib ncig ntawm lub transformer yooj yim dua txuas mus rau lwm yam ua rau lub suab nrov.
3) Thaum lub rectifier diode nyob rau sab thib ob ntawm lub rectifier diode yog siv rau high-frequency rectification, vim lub sij hawm rov qab los ntawm lub sij hawm rov qab, tus nqi ntawm cov khoom siv tam sim no tsis tuaj yeem tshem tawm tam sim ntawd thaum rov qab voltage siv ( vim muaj cov neeg nqa khoom, tseem muaj cov dej ntws tam sim no). Thaum txoj kab nqes ntawm qhov rov qab tam sim no loj dhau lawm, qhov inductance ntws los ntawm lub kauj yuav ua rau lub zog siab tshaj plaws, uas yuav ua rau muaj kev cuam tshuam ntau zaus nyob rau hauv kev cuam tshuam ntawm transformer to inductance thiab lwm yam kev faib tawm, thiab nws cov zaus tuaj yeem ncav cuag kaum tawm. MHz.
4) Capacitor, inductor thiab xaim hloov hluav taws xob yuav hloov cov yam ntxwv ntawm cov khoom siv tsawg zaus vim nws ua haujlwm ntawm ntau zaus, yog li tsim suab nrov.
