Qhov sib txawv ntawm qhov hloov pauv hom fais fab mov thiab cov khoom siv hluav taws xob linear
Dab tsi yog switching fais fab mov
Switching fais fab mov yog lub ntsiab lus ntawm switching tswj fais fab mov. Nws feem ntau yog hais txog AC (alternating tam sim no)-DC (direct tam sim no) converter uas nws cov tswv yim yog AC voltage thiab nws cov zis yog DC voltage. Lub hwj chim hloov raj hauv lub zog hloov hluav taws xob ua haujlwm hauv lub xeev hloov pauv siab, thiab siv lub zog qis heev. Lub zog ua haujlwm tuaj yeem ncav cuag 75% mus rau 90%, uas yog ob zaug ntawm cov khoom siv hluav taws xob zoo tib yam.
1. Lub hauv paus ntsiab lus ntawm kev hloov fais fab mov
Lub tshuab hluav taws xob hloov hluav taws xob yog lub zog siv hluav taws xob uas siv cov cuab yeej hluav taws xob niaj hnub los tswj lub sijhawm tig thiab tig tawm ntawm qhov hloov pauv hloov pauv kom tswj tau qhov hluav taws xob ruaj khov. Lub zog hloov hluav taws xob yog tsim los ntawm pulse width modulation (PWM) tswj (hlau oxide semi-field effect transistor).
Cov khoom siv hluav taws xob hloov hluav taws xob yog tsim los ntawm plaub ntu: lub ntsiab Circuit Court, tswj Circuit Court, nrhiav pom 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 hla, thiab lwm lub qhov rooj nres tam sim no los ntawm kev. Yog li cas lub qhov rooj?
Qee cov khoom siv hluav taws xob hloov pauv siv thyristors, thiab qee qhov siv cov raj hloov pauv. Cov no cia siab rau cov cim mem tes ntxiv rau hauv lub hauv paus, (switching tube) tswj electrode (thyristor) kom ua tiav cov kev coj ua thiab kev txiav tawm, ua rau lub tshuab hluav taws xob tsis tu ncua hauv av yog 'on' thiab 'tawm', tso cai rau cov khoom siv hluav taws xob hloov mus. mem tes modulate lub input voltage, yog li ua tiav DC / AC, DC / DC voltage hloov dua siab tshiab, nrog rau adjustable tso zis voltage thiab tsis siv neeg voltage stabilization.
Qhov sib txawv ntawm kev hloov fais fab mov thiab linear fais fab mov
Cias muab tso, qhov kev tswj qhov hluav taws xob ntawm cov khoom siv hluav taws xob tuaj yeem suav tias yog tus nqi tiv thaiv, uas yog sib npaug los hloov qhov hluav taws xob los ntawm kev kho qhov zawv zawg rheostat, thaum lub zog hloov hluav taws xob hloov pauv qhov hluav taws xob los ntawm kev kho qhov zaus ntawm qhov hloov. Nyob rau tib lub sijhawm, 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 kev nce hauv cov zis hluav taws xob, tab sis qhov kev loj hlob txawv.
1. Tus nqi ntawm cov khoom siv hluav taws xob tawm yog siab dua li ntawm kev hloov hluav taws xob ntawm ib qho chaw tso zis hluav taws xob.
Yog li ntawd, nrog kev txhim kho thiab kev tsim kho tshiab ntawm lub zog hluav taws xob tshuab hluav taws xob, kev hloov hluav taws xob siv tshuab txuas ntxiv ua kom muaj kev sib tw thiab kev tsim kho tshiab. Qhov teeb meem ntawm tus nqi no tau hloov pauv hloov hluav taws xob thev naus laus zis mus rau qhov tso zis hluav taws xob qis kawg, muab ntau qhov chaw loj hlob rau kev hloov cov khoom siv hluav taws xob.
2. Cov khoom siv hluav taws xob hluav taws xob muaj kev cuam tshuam ntau ntxiv rau tib neeg txoj haujlwm thiab lub neej, thiab cov khoom siv hluav taws xob tsis sib cais los ntawm cov khoom siv hluav taws xob txhim khu kev qha. Tom qab nkag mus rau xyoo 1980s, cov khoos phis tawj tau pom zoo hloov cov khoom siv hluav taws xob. Los ntawm xyoo 1990, hloov cov khoom siv hluav taws xob tau nkag mus rau ntau yam khoom siv hluav taws xob thiab hluav taws xob. teb.
Tsuas yog kaum xyoo, kev hloov hluav taws xob siv thev naus laus zis tau nrawm nrawm ntawm txoj haujlwm tseem ceeb ntawm cov khoom siv hluav taws xob hluav taws xob. Qhov no puas yog vim qhov me me ntawm kev hloov hluav taws xob?
3. Qhov tseeb, nws tuaj yeem nkag siab los ntawm schematic daim duab ntawm lub zog hloov hluav taws xob: nws tsis siv lub zog loj zaus transformer, thiab tib lub sijhawm, vim tias lub zog dissipation ntawm lub raj hloov kho tau txo qis, qhov kub loj dua. dab dej tshem tawm. Qhov no ua rau lub zog hloov pauv me me thiab sib dua. Txawm li cas los xij, qhov zoo tshaj plaws ntawm kev hloov hluav taws xob yog-tsawg zog siv thiab ua haujlwm siab. Nyob rau hauv lub switching fais fab mov Circuit Court, lub transistor yog stimulated los ntawm lub excitation teeb liab, thiab nws tsis tu ncua rov ua lub xeev switching ntawm 'on' thiab 'off'. Kev hloov pauv ceev yog ceev heev, thiab qhov zaus tsuas yog 50HZ, uas zoo heev txhim kho cov khoom siv hluav taws xob.
4. Lub tshuab hluav taws xob hloov hluav taws xob muaj qhov dav dav voltage stabilizing ntau yam. Cov zis hluav taws xob los ntawm kev hloov hluav taws xob hloov pauv tau hloov kho los ntawm lub luag haujlwm ntawm lub voj voog ntawm lub suab nrov, thiab 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, nws tseem tuaj yeem ua kom ntseeg tau tias cov zis hluav taws xob ruaj khov thaum lub zog hluav taws xob zaus hluav taws xob hloov pauv tau zoo heev.
5. Kev ua haujlwm zaus ntawm kev hloov hluav taws xob tam sim no yog 50kHz, uas yog 1000 npaug ntawm cov kab hluav taws xob tswj hluav taws xob. Qhov no ua rau kom cov lim dej ua tau zoo tom qab kho los ntawm yuav luag 1000 zaug; Txawm hais tias siv ib nrab-yoj rectification thiab capacitor filtering yog siv, qhov ua tau zoo tseem tsawg. Txhim kho 500 zaug. Nyob rau hauv tib lub ripple tso zis voltage, thaum siv ib tug switching fais fab mov, lub peev xwm ntawm lub lim capacitor tsuas yog 1/500 ~ 1/1000 ntawm lub lim capacitor nyob rau hauv ib tug linear tswj fais fab mov.
