Qhov sib txawv ntawm kev hloov hom fais fab mov thiab linear fais fab mov
Dab tsi yog switching power supply
Switching fais fab mov yog cov ntawv luv rau kev hloov hluav taws xob tswj hluav taws xob, feem ntau xa mus rau AC (alternating tam sim no) - DC (direct tam sim no) converter uas inputs AC voltage thiab outputs DC voltage. Lub hwj chim hloov raj hauv lub tshuab hluav taws xob hloov hluav taws xob ua haujlwm hauv lub xeev hloov pauv siab, siv lub zog qis heev. Lub zog ua haujlwm tuaj yeem ncav cuag 75% mus rau 90%, uas yog ob zaug siab dua li cov khoom siv hluav taws xob zoo tib yam.
Kev ua hauj lwm hauv paus ntsiab lus ntawm kev hloov hom fais fab mov
Hloov fais fab mov yog ib hom khoom siv hluav taws xob uas siv cov cuab yeej siv hluav taws xob niaj hnub los tswj lub sij hawm sib piv ntawm kev hloov cov transistors rau thiab tawm, tswj xyuas qhov hluav taws xob ruaj khov. Lub zog hloov hluav taws xob yog tsim los ntawm pulse width modulation (PWM) tswj (hlau oxide semiconductor field-effect transistors).
Switching fais fab mov muaj plaub yam tseem ceeb: lub ntsiab Circuit Court, tswj Circuit Court, nrhiav kom tau Circuit Court, thiab auxiliary circuit. Hloov fais fab mov, raws li lub npe qhia, yog sib npaug rau muaj lub qhov rooj ntawm no, ib lub qhov rooj tso cai rau tam sim no dhau mus thiab lwm lub qhov rooj nres tam sim no tsis dhau. Yog li cas lub qhov rooj?
Qee cov khoom siv hluav taws xob hloov hluav taws xob siv thyristors, thaum lwm tus siv cov hloov pauv hloov pauv, uas tso siab rau lub hauv paus thiab tswj cov hluav taws xob (thyristor) ntxiv rau cov cim mem tes kom ua tiav cov kev coj ua thiab kev txiav tawm, tso cai rau cov hluav taws xob hloov mus tas li 'tig' thiab 'tig', thiab enabling lub tshuab hluav taws xob hloov mus rau mem tes modulate input voltage, yog li ua tiav DC / AC, DC / DC voltage hloov dua siab tshiab, nrog rau adjustable thiab tsis siv neeg voltage tswj ntawm cov zis voltage.
Qhov sib txawv ntawm kev hloov hom fais fab mov thiab linear fais fab mov
Tsuas yog muab tso rau, qhov kev tswj qhov hluav taws xob ntawm cov khoom siv hluav taws xob tuaj yeem pom tau tias yog kev tswj hwm tus nqi, uas yog sib npaug los hloov qhov hluav taws xob los ntawm kev kho cov zawv zawg resistor, thaum lub zog hloov hluav taws xob hloov qhov voltage los ntawm kev kho qhov zaus ntawm qhov hloov. Lub caij no, piv nrog cov khoom siv hluav taws xob linear, tus nqi ntawm ob qho tib si hloov khoom siv hluav taws xob nce ntxiv nrog qhov nce ntawm cov zis hluav taws xob, tab sis qhov kev loj hlob ntawm ob qhov sib txawv.
1. Tus nqi ntawm cov khoom siv hluav taws xob linear yog qhov tseeb siab dua li ntawm qhov hloov hluav taws xob hloov hluav taws xob ntawm qee qhov tso zis hluav taws xob.
Yog li ntawd, nrog rau txoj kev loj hlob thiab innovation ntawm lub hwj chim electronics technology, hloov hom fais fab mov technology txuas ntxiv mus ua txhaum thiab innovate. Qhov teeb meem ntawm tus nqi no tau hloov pauv hloov pauv hloov hluav taws xob siv thev naus laus zis mus rau qhov tso zis hluav taws xob qis kawg, muab ntau qhov chaw loj hlob rau kev hloov pauv hluav taws xob.
2. Kev sib raug zoo ntawm cov khoom siv hluav taws xob hluav taws xob thiab tib neeg txoj haujlwm thiab lub neej tau dhau los ua ze, thiab cov khoom siv hluav taws xob tsis tuaj yeem ua yam tsis muaj lub zog muaj zog. Tom qab nkag mus rau xyoo 1980s, cov khoos phis tawj tau paub txog kev hloov pauv hloov hluav taws xob, thiab hauv xyoo 1990, cov khoom siv hluav taws xob hloov pauv tau nkag mus rau ntau yam hluav taws xob thiab hluav taws xob.
Nyob rau hauv tsuas yog kaum xyoo, hloov hom fais fab mov technology tau ceev ceev nyob rau hauv lub tseem ceeb txoj hauj lwm ntawm lub hwj chim hluav taws xob li. Puas yog qhov no tsuas yog vim cov khoom siv hluav taws xob hloov pauv me me?
3. Qhov tseeb, los ntawm schematic daim duab ntawm lub switching fais fab mov, nws muaj peev xwm to taub hais tias nws tsis siv bulky fais fab zaus transformers, thiab vim hais tias lub dissipated hwj chim nyob rau hauv lub adjustable raj yog heev txo, nws tshem tawm qhov xav tau rau loj tshav kub dab dej. . Qhov no txo qhov loj thiab qhov hnyav ntawm lub zog hloov hluav taws xob. Txawm li cas los xij, qhov zoo tshaj plaws ntawm cov khoom siv hluav taws xob hloov pauv yog siv hluav taws xob tsawg thiab ua haujlwm siab. Nyob rau hauv lub switching fais fab mov Circuit Court, lub transistor dua switches ntawm 'on' thiab 'off' xeev nyob rau hauv lub excitation teeb liab, nrog ib tug ceev heev conversion ceev thiab ib tug zaus ntawm 50Hz, zoo heev txhim kho lub zog efficiency.
4. Lub tshuab hluav taws xob hloov hluav taws xob muaj kev tswj hwm qhov dav dav. Cov zis hluav taws xob ntawm qhov hloov hluav taws xob hloov hluav taws xob yog tswj hwm los ntawm lub luag haujlwm lub voj voog ntawm lub teeb liab excitation, thiab qhov kev hloov pauv ntawm cov teeb liab input voltage tuaj yeem them nyiaj los ntawm kev hloov pauv ntau zaus lossis dav hloov pauv. Nyob rau hauv txoj kev no, txawm tias thaum qhov hluav taws xob ntawm daim phiaj hluav taws xob sib txawv heev, nws tseem tuaj yeem ua kom ntseeg tau tias qhov hluav taws xob ruaj khov.
5. Kev khiav hauj lwm zaus ntawm cov khoom siv hluav taws xob hloov pauv tam sim no yog 50kHz, uas yog 1000 npaug siab dua li cov khoom siv hluav taws xob linear. Qhov no kuj ua rau kom muaj kev lim dej ntawm cov khoom siv hluav taws xob rectified los ntawm yuav luag 1000 zaug; Txawm tias muaj ib nrab nthwv dej rectification thiab capacitor lim, qhov ua tau zoo tau nce 500 zaug. Nyob rau tib lub ripple tso zis voltage, thaum siv ib tug switching fais fab mov, lub peev xwm ntawm filtering capacitor tsuas yog 1/500 ~ 1/1000 ntawm qhov uas nyob rau hauv ib tug linear regulator fais fab mov.
