Kev soj ntsuam ntawm cov zis waveform ntawm switching fais fab mov
Hloov fais fab mov yog ib hom khoom siv hluav taws xob uas siv cov cuab yeej hluav taws xob niaj hnub siv hluav taws xob los tswj lub sij hawm piv ntawm kev hloov lub raj rau thiab tawm thiab tswj cov zis hluav taws xob ruaj khov. Kev hloov hluav taws xob feem ntau yog tsim los ntawm pulse width modulation (PWM) tswj IC thiab MOSFET. Nrog rau txoj kev loj hlob thiab innovation ntawm lub hwj chim electronics technology, lub switching fais fab mov technology yog tas li innovating. Tam sim no, kev hloov hluav taws xob hloov pauv tau siv dav hauv yuav luag txhua yam khoom siv hluav taws xob vim nws qhov me me, lub teeb yuag thiab kev ua haujlwm siab, thiab nws yog ib qho khoom siv hluav taws xob tsis tseem ceeb rau kev loj hlob sai ntawm cov ntaub ntawv hluav taws xob hauv kev lag luam.
Kev sib xyaw ntawm switching circuit
Switching fais fab mov muaj plaub yam: lub ntsiab Circuit Court, switching fais fab mov tswj Circuit Court, nrhiav pom Circuit Court thiab auxiliary fais fab mov.
1. Main Circuit Court
Impulse tam sim no limiting: txwv cov impulse tam sim no nyob rau sab input thaum lub sij hawm lub hwj huam mov qhib.
Input lim: nws txoj haujlwm yog lim cov clutter uas twb muaj lawm nyob rau hauv daim phiaj fais fab thiab tiv thaiv cov clutter generated los ntawm lub tshuab no tsis pub rov qab mus rau hauv daim phiaj fais fab.
Rectification thiab filtering: AC fais fab mov ntawm daim phiaj hluav taws xob yog ncaj qha rectified rau DC zog smoother.
Inverter: Hloov lub DC rectified rau hauv high-frequency AC, uas yog ib feem ntawm high-frequency switching fais fab mov.
Output rectification thiab filtering: muab qhov ruaj khov thiab txhim khu kev qha DC fais fab mov raws li qhov yuav tsum tau ua.
2. Ntawm ib sab, cov qauv tswj Circuit Court los ntawm cov zis kawg, muab piv nrog cov nqi teev, thiab tom qab ntawd tswj cov inverter hloov nws cov mem tes dav lossis mem tes zaus kom cov zis ruaj khov. Ntawm qhov tod tes, raws li cov ntaub ntawv muab los ntawm qhov ntsuas hluav taws xob, kev tswj xyuas hluav taws xob tau txheeb xyuas los ntawm kev tiv thaiv Circuit Court los muab ntau yam kev tiv thaiv kev tiv thaiv rau lub hwj chim mov.
3. Qhov kev kuaj xyuas Circuit Court muab ntau yam tsis muaj thiab ntau cov ntaub ntawv ntsuas kev ua haujlwm hauv kev tiv thaiv Circuit Court.
4. Cov khoom siv hluav taws xob pabcuam paub txog software (chaw taws teeb) pib ntawm lub zog hluav taws xob thiab muab lub zog rau kev tiv thaiv Circuit Court thiab tswj Circuit Court (PWM thiab lwm yam chips).
Analysis ntawm cov zis waveform ntawm switching circuit
(1) CCM thiab DCM hom kev txiav txim
Qhov kev txiav txim ntawm CCM thiab DCM tsis yog nyob ntawm seb qhov tseem ceeb tam sim no txuas ntxiv lossis tsis ua. Tab sis raws li tam sim no synthesis ntawm thawj thiab theem nrab. Tsuav yog cov thawj thiab theem nrab tam sim no sib txawv thiab xoom, nws yog hom CCM. Thiab yog tias muaj ib lub xeev uas cov thawj thiab theem nrab tam sim no yog xoom tib lub sijhawm, nws yog hom DCM. Hauv nruab nrab yog BCM hom.
(2) qhov sib txawv ntawm ob hom hauv waveform.
● Transformer thawj tam sim no, CCM hom yog trapezoidal nthwv dej, thaum DCM hom yog triangular yoj.
Tsawg theem nrab rectifier tam sim no waveform, CCM hom yog trapezoidal yoj, DCM hom yog daim duab peb sab yoj.
● Vds waveform ntawm ●MOS, CCM hom, Vds tseem nyob ntawm lub platform ntawm Vin Vf kom txog thaum lub voj voog tom ntej qhib. Hauv DCM hom, ua ntej lub voj voog tom ntej qhib, Vds yuav nqis los ntawm lub platform ntawm Vin Vf thiab muaj damping oscillation. (Vf theem nrab cuam tshuam rau thawj qhov hluav taws xob). Yog li ntawd, peb tuaj yeem pom tau yooj yim los ntawm waveform seb lub flyback fais fab mov ua haujlwm hauv CCM lossis DCM.
