Ntau cov haujlwm ntawm cov kws tsim khoom kho vajtse tau ua tiav ntawm lub rooj tsavxwm lub qhov, tab sis muaj qhov tshwm sim ntawm kev sib txuas ntawm qhov zoo thiab qhov tsis zoo ntawm cov khoom siv hluav taws xob, uas ua rau ntau cov khoom siv hluav taws xob hlawv, thiab txawm tias tag nrho lub rooj tsavxwm raug rhuav tshem, thiab nws yuav tsum tau ua. yuav welded dua, kuv tsis paub yuav ua li cas zoo yuav daws tau nws?
Ua ntej tshaj plaws, kev tsis saib xyuas yog qhov yuav tsum tau zam, txawm hais tias nws tsuas yog kom paub qhov zoo thiab qhov tsis zoo ntawm ob lub xov hlau, liab thiab dub, yuav raug xaim ib zaug, peb yuav tsis ua yuam kev; Kaum kev sib txuas yuav tsis yuam kev, tab sis 1,000? Yuav ua li cas txog 10,000? Lub sijhawm no nws yog ib qho nyuaj rau hais, vim peb tsis saib xyuas, ua rau qee cov khoom siv hluav taws xob thiab cov chips hlawv tawm, qhov laj thawj tseem ceeb yog vim li cas tam sim no ntau dhau ntawm ambassador Cheebtsam tau tawg, yog li peb yuav tsum tau ntsuas los tiv thaiv kev rov qab sib txuas. .
Muaj cov txheej txheem hauv qab no feem ntau siv:
01 diode series hom tiv thaiv rov qab tiv thaiv Circuit Court
Ib tug pem hauv ntej diode txuas nrog nyob rau hauv series ntawm lub hwj chim zoo input kom siv tag nrho cov diode tus yam ntxwv ntawm pem hauv ntej conduction thiab rov qab txiav. Raws li ib txwm muaj, lub raj thib ob ua haujlwm thiab lub rooj tsav xwm hluav taws xob ua haujlwm.
Thaum cov khoom siv hluav taws xob thim rov qab, lub diode raug txiav tawm, cov khoom siv hluav taws xob tsis tuaj yeem tsim lub voj voog, thiab lub rooj tsav xwm Circuit Court tsis ua haujlwm, uas tuaj yeem tiv thaiv qhov teeb meem ntawm lub hwj chim.
02 Rectifier choj hom tiv thaiv rov qab tiv thaiv Circuit Court
Siv tus choj rectifier los hloov lub zog nkag mus rau hauv qhov tsis muaj polar input, txawm tias lub hwj chim txuas nrog lossis thim rov qab, lub rooj tsavxwm ua haujlwm ib txwm.
Yog hais tias lub silicon diode muaj lub siab poob ntawm txog 0.6 ~ 0.8V, lub germanium diode kuj muaj lub siab poob ntawm li 0.2 ~ 0.4V, yog hais tias lub siab poob siab dhau lawm, lub MOS raj yuav siv tau los tiv thaiv kev kho mob, lub siab poob ntawm MOS raj yog me me, mus txog rau ob peb milliohm, thiab lub siab poob yuav luag tsis pom zoo.
03 MOS raj tiv thaiv rov qab tiv thaiv Circuit Court
MOS raj vim txoj kev txhim kho, nws tus kheej cov khoom thiab lwm yam, nws qhov kev ua haujlwm sab hauv yog me me, ntau yam yog milliohm theem, los yog me me, yog li ntawd lub Circuit Court poob, lub zog poob los ntawm Circuit Court yog me me, los yog txawm negligible. , yog li xaiv MOS raj los tiv thaiv Circuit Court yog ib qho kev pom zoo ntau dua.
1) NMOs tiv thaiv
Raws li qhia hauv qab no: Thaum lub sijhawm fais fab tuag, cov kab mob parasitic diode ntawm MOS raj tau hloov mus, thiab lub kaw lus tsim ib lub voj. Lub peev xwm ntawm qhov S yog txog 0.6V, thaum lub peev xwm ntawm lub rooj vag G yog Vbat. Qhov qhib qhov hluav taws xob ntawm MOS raj yog qhov tsis tshua muaj: Ugs = Vbat-Vs, lub rooj vag siab, ds ntawm NMOS yog nyob, cov kab mob parasitic yog luv luv, thiab cov kab ke ua ib lub voj los ntawm ds nkag ntawm NMOS.
Yog tias lub zog hluav taws xob thim rov qab, qhov hluav taws xob ntawm NMOS yog 0, NMOS raug txiav tawm, cov kab mob parasitic diode thim rov qab, thiab lub Circuit Court raug txiav, yog li tsim kev tiv thaiv.
2) PMOS tiv thaiv
Raws li qhia hauv qab no: Thaum lub sijhawm fais fab tuag, cov kab mob parasitic diode ntawm MOS raj tau hloov mus, thiab lub kaw lus tsim ib lub voj. Lub peev xwm ntawm qhov chaw S yog hais txog Vbat-0.6V, thaum lub peev xwm ntawm lub rooj vag G yog 0. Qhov qhib qhov hluav taws xob ntawm MOS raj yog qhov tsis tshua muaj: Ugs = 0 - (Vbat-0.6), lub rooj vag coj mus rau theem qis. , ds ntawm PMOS yog nyob rau, cov kab mob parasitic diode yog luv luv, thiab lub kaw lus tsim ib lub voj los ntawm ds nkag ntawm PMOS.
Yog tias qhov hluav taws xob hloov pauv, qhov hluav taws xob ntawm NMOS ntau dua 0, PMOS raug txiav tawm, cov kab mob parasitic diode thim rov qab, thiab lub Circuit Court raug txiav, yog li tsim kev tiv thaiv.
Nco tseg: NMOS hlab hlua ds mus rau qhov tsis zoo electrode, PMOS hlab hlua ds mus rau qhov zoo electrode, thiab parasitic diode kev taw qhia yog mus rau qhov raug kev cob cog rua tam sim no.
Kev nkag mus ntawm D thiab S ncej ntawm MOS raj: feem ntau yog siv MOS raj nrog N channel, tam sim no feem ntau nkag los ntawm D ncej thiab ntws tawm ntawm S ncej, thiab PMOS nkag thiab D tawm ntawm S. ncej, thiab qhov opposite yog muaj tseeb thaum thov nyob rau hauv no Circuit Court, qhov voltage ntawm lub MOS raj tau ntsib los ntawm cov conduction ntawm parasitic diode.
MOS raj yuav hloov tag nrho ntev npaum li qhov tsim nyog qhov hluav taws xob tau tsim los ntawm G thiab S ncej. Tom qab ua tiav, nws zoo li qhov hloov pauv tau raug kaw ntawm D thiab S, thiab qhov tam sim no yog tib yam los ntawm D mus rau S lossis S rau D.
Hauv kev siv cov tswv yim, G ncej feem ntau txuas nrog lub resistor, thiab txhawm rau tiv thaiv MOS raj los ntawm kev tawg, ib qho hluav taws xob regulator diode kuj tuaj yeem ntxiv. Lub capacitor txuas nrog rau qhov sib npaug mus rau ib qho kev faib tawm muaj qhov muag muag muag. Thaum lub sijhawm tam sim no pib ntws, lub capacitor raug them thiab qhov voltage ntawm G ncej yog maj mam tsim.
Rau PMOS, piv nrog NOMS, Vgs yuav tsum muaj ntau dua li qhov pib voltage. Vim tias qhov qhib qhov hluav taws xob tuaj yeem yog 0, qhov sib txawv ntawm DS tsis loj, uas yog qhov zoo dua NMOS.
04 Fuse tiv thaiv
Muaj ntau yam khoom siv hluav taws xob tuaj yeem pom tom qab qhib lub zog hluav taws xob nrog lub fuse, hauv cov khoom siv hluav taws xob thim rov qab, muaj qhov luv luv hauv Circuit Court vim tam sim no loj, thiab tom qab ntawd lub fuse tau tawg, ua lub luag haujlwm hauv kev tiv thaiv cov khoom siv hluav taws xob. Circuit Court, tab sis txoj kev no kho thiab hloov yog teeb meem ntau dua.
Lub sij hawm xa tuaj: Plaub Hlis-08-2023
