Lub hauv paus ntsiab lus ntawm pulse-width simulation (PWM) tau paub ntev los lawm, tab sis nws tau siv ntau lub voj voog tsis ntev los no. Nws yog lub sijhawm tseem ceeb rau kev ua haujlwm ntawm ntau lub cuab yeej siv hauv ntau qhov chaw: cov khoom siv hluav taws xob tsis cuam tshuam ntawm ntau lub peev xwm, zaus hloov pauv, voltage, tam sim no lossis ceev tswj systems, kuaj zaus converters, thiab lwm yam. Nws tau ua pov thawj tias yog qhov zoo tshaj plaws hauv kev lag luam tsheb thiab hauv kev tsim khoom raws li lub hauv paus rau kev tswj kev ua haujlwm ntawm ob qho tib si kev pabcuam thiab muaj zog hluav taws xob motors. PWM maub los tau ua pov thawj nws tus kheej zoo hauv ntau lub voj voog.
Cia peb saib qee qhov piv txwv uas qhia tau tias koj tuaj yeem tswj tau qhov ceev ntawm lub tshuab hluav taws xob siv hluav taws xob uas muaj xws li PWM maub los. Piv txwv tias koj yuav tsum tau hloov qhov ceev ntawm lub tshuab hluav taws xob hauv cov cua sov ntawm koj lub tsheb. Kev txhim kho tseem ceeb heev, puas yog? Tshwj xeeb tshaj yog nyob rau lub caij so, thaum koj xav tswj qhov kub thiab txias hauv chav tsev kom zoo. DC lub cev muaj zog ntsia hauvcov kab ke no, tso cai rau koj hloov qhov nrawm, tab sis koj yuav tsum cuam tshuam nws EMF. Nrog kev pab los ntawm cov khoom siv hluav taws xob niaj hnub no, txoj haujlwm no yooj yim ua kom tiav. Txhawm rau ua qhov no, lub zog hluav taws xob muaj txiaj ntsig zoo nyob rau hauv lub cev muaj zog hluav taws xob Circuit Court. Tswj nws, koj twv nws, PWM ceev tswj. Nrog nws, koj tuaj yeem hloov qhov ceev ntawm lub tshuab hluav taws xob hla ntau yam.
PWM maub los ua haujlwm li cas hauv AC circuits? Nyob rau hauv cov ntaub ntawv no, ib tug me ntsis txawv tswj tswvyim yog siv, tab sis lub hauv paus ntsiab lus ntawm kev ua hauj lwm tseem zoo li qub. Ua piv txwv, xav txog kev ua haujlwm ntawm lub tshuab hloov zaus. Cov khoom siv no tau siv dav hauv kev tsim khoom los tswj kev ceev ntawm cov motors. Yuav pib nrog, peb-theem voltage yog rectified siv tus choj Larionov thiab ib nrab smoothed tawm. Thiab tsuas yog tom qab ntawd nws tau pub rau lub rooj sib tham muaj zog bipolar lossis ib qho module raws li qhov cuam tshuam ntawm thaj chaw transistors. Nws yog tswj los ntawm PWM voltage regulator sib sau ua ke ntawm lub microcontroller. Nws tsim cov tswj pulses, lawv qhov dav thiab zaus, tsim nyog rau kev tsim ntawm ib qho ceev ntawm lub tshuab hluav taws xob.
Hmoov tsis zoo, ntxiv rau qhov ua tau zoo, hauv cov kab hluav taws xob uas siv PWM maub los, lub suab nrov hauv lub zog hluav taws xob feem ntau tshwm sim. Qhov no yog vim muaj cov inductance nyob rau hauv windings ntawm hluav taws xob motors thiab kab nws tus kheej. Lawv tawm tsam nrog qhov no nrog ntau yam kev daws teeb meem hauv Circuit Court: lawv nruab muaj zog tiv thaiv hluav taws xob hauv AC circuits lossis muab lub rov qab diode nyob rau tib lub sijhawm nrog lub cev muaj zog. DC fais fab mov circuits.
Cov circuits zoo li no yog qhov muaj kev ntseeg siab txaus hauv kev ua haujlwm thiab yog lub hauv paus ntawm kev tswj fais fab ntawm ntau lub peev xwm. Lawv yog cov compact thiab tswj tau zoo. Cov kev hloov kho tshiab kawg ntawm cov khoom siv no tau siv dav hauv kev tsim khoom.
