Lub hauv paus ntsiab lus ntawm PWM simulation (PWM) tau paub rau ib ntev lub sij hawm, tab sis thov nyob rau hauv txawv schemes nws tau ua ntev los no. Nws yog tseem ceeb heev rau ntau pab kiag li lawm siv nyob rau hauv ntau yam teb: uninterruptible mov fais fab ua, zaus converters, voltage kev cai, tam sim no los yog ceev kuaj zaus converters, etc. Nws yog zoo pov thawj nyob rau hauv lub tsheb lag luam thiab nyob rau hauv qhuav raws li ib tug neeg rau kev tswj lub lag luam ntawm ob cov kev pab cuam thiab haib motors. Lub PWM xws tau ua hauj lwm zoo thaum kev khiav hauj lwm nyob rau hauv ntau circuits.
Cia peb kawm txog tej tswv yim piv txwv uas qhia yuav ua li cas mus kho cov tsav ceev los ntawm hluav taws xob circuits, uas muaj xws li cov PWM xws li. Piv txwv hais tias koj yuav tau hloov lub cev muaj zog ceev nyob rau hauv koj lub tsheb thaxim sab hauv cov cua kub system. Txaus pab kev txhim kho, tsis yog nws? Tshwj xeeb yog nyob rau hauv lub off-lub caij, thaum muaj ib tug xav kom tswj tau lub sab hauv kub maj. DC tsav ntsia tau rau hauv no system, ua rau nws tau hloov lub zog, tab sis nws yog tsim nyog los ua raws li nws EMF. Nrog kev pab los ntawm niaj hnub hluav taws xob hais tias ua hauj lwm yooj yim yuav ua kom tiav. Rau lub hom phiaj no, lub hwj huam mov Circuit Court ntawm lub cav puv lub hwj chim FET. Tswj, koj guessed nws, PWM ceev tswj. Nrog nws, koj yuav tau hloov lub cev muaj zog ceev nyob rau hauv ib tug ntau yam.
Yuav ua li cas puas PWM tswj Circuit Court nyob rau hauv lub AC? Nyob rau hauv cov ntaub ntawv no, ib tug sib txawv dog dig tswj Circuit Court, tab sis lub kev khiav hauj lwm hauv paus ntsiab lus tseem zoo li qub. Raws li ib qho piv txwv, xav txog lub lag luam los ntawm cov zaus converter. Xws li yog lug siv nyob rau hauv raug rau regulating engine ceev. Yuav pib peb-theem voltage yog rectified ntawm ib tug choj Larionov thiab ib nrab smoothed. Thiab xwb ces noj mus rau lub haib bipolar los ua ke los yog module-raws li teb-nyhuv transistors. Ntawm lwm yam uas yog lawv voltage PWM xws li, sau rau lub hauv paus ntawm lub microcontroller. Nws generates cov kev tswj pulses, lub dav thiab lub zaus tsim nyog rau tsim ntawm ib tug kev lub cev muaj zog ceev.
Tu siab, nyob rau hauv tas li ntawd mus kawm zoo nyob rau hauv daim ntaub ntawv nyob qhov twg lub PWM tswj yog feem ntau tshwm sim muaj zog cuam nyob rau hauv lub hwj chim Circuit Court. Qhov no yog vim muaj cov inductance nyob rau hauv lub windings ntawm electric motors thiab cov kab nws tus kheej. Tawm tsam nrog no ntau yam schematics: qhov chaw kawm ib tug haib surge nyob rau hauv AC circuits los yog muab dawb-wheeling diode nyob rau hauv thaum uas tig mus rau hauv lub cev muaj zog nyob rau hauv DC fais fab mov.
Tej circuits txawv sufficiently siab ntseeg nyob rau hauv lub lag luam thiab yog txoj kev nyob rau hauv lub teb ntawm ntau yam hluav taws xob hwj chim tswj. Lawv yog cov compact txaus thiab zoo tswj. Tsis ntev los no hloov ntawm cov pab kiag li lawm yog lug siv nyob rau hauv qhov.