Yuav tiv thaiv thyristor li cas

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Yuav tiv thaiv thyristor li cas

Daim ntawv thov ntawm thyristors nyob rau hauv kev lag luam yog ntau thiab ntau, thiab daim ntawv thov ntau yam ntawm kev lag luam nce. Lub luag haujlwm ntawm thyristors kuj tau ua tiav. Tab sis qee zaum, thyristors tuaj yeem ua rau qee qhov kev puas tsuaj thaum siv. Txhawm rau kom ntseeg tau lub neej ntawm thyristor, peb tuaj yeem tiv thaiv thyristor zoo li cas?

Lub thyristor yog rhiab heev rau overvoltage thaum siv. Overcurrent kuj muaj kev puas tsuaj loj rau thyristor. Xi'an Ruixin Company qhia txog kev tiv thaiv ntawm thyristors, raws li hauv qab no:

1, dhau voltage tiv thaiv

Lub thyristor yog rhiab heev rau overvoltage. Thaum qhov hluav taws xob rau pem hauv ntej tshaj nws qhov tawm ntawm lub xeev rov ua qhov siab tshaj UDRM, lub thyristor yuav ua tsis raug, ua rau tsis ua hauj lwm hauv Circuit Court. Thaum cov ntaub ntawv rov qab siv hluav taws xob ntau tshaj nws qhov rov qab rov ua dua qhov siab tshaj URRM, lub thyristor Nws yuav raug puas tsuaj tam sim ntawd. Yog li ntawd, nws yog ib qho tsim nyog los kawm txog qhov ua rau ntawm overvoltage thiab txoj kev ntawm suppressing lub overvoltage.

Qhov ua rau overvoltage feem ntau yog vim qhov hloov pauv loj hauv cov khoom siv hluav taws xob los yog lub zog khaws cia ntawm lub cev, uas ua rau lub cev hloov pauv lig dhau los, lossis lub zog hluav taws xob hauv lub cev tau lig dhau los ua kom tawg. Qhov kev tshawb pom tseem ceeb yog ob hom surge voltages tshwm sim los ntawm kev cuam tshuam sab nraud xws li xob laim thiab hluav taws xob hluav taws xob tshwm sim los ntawm kev qhib thiab kaw ntawm cov keyboards. Overvoltages tshwm sim los ntawm xob laim los yog high-voltage Circuit Court breakers, thiab lwm yam, yog voltage spikes ntawm ob peb microseconds mus rau ob peb milliseconds, uas yog txaus ntshai rau thyristors. Qhov hluav taws xob hluav taws xob tshwm sim los ntawm kev qhib thiab kaw ntawm qhov hloov pauv tau muab faib ua cov pawg hauv qab no:

(1) Overvoltage generated los ntawm AC lub hwj chim rau thiab tawm

Piv txwv li, qhov overvoltage tshwm sim los ntawm kev qhib thiab kaw ntawm AC hloov, lub fuse ntawm AC sab fuse, thiab lwm yam, thiab cov overvoltage vim yog qhov sib faib capacitance ntawm transformer winding, lub resonance Circuit Court tshwm sim los ntawm cov to reactance, thiab qhov kev faib hluav taws xob ntawm lub capacitor ua rau tus nqi overvoltage tus nqi ib txwm muaj 2 Ntau tshaj 10 zaug. Feem ntau, qhov qhib thiab kaw nrawm dua, qhov siab dua qhov overvoltage, thiab siab dua qhov overvoltage thaum lub Circuit Court qhib nyob rau hauv tsis muaj load.

(2) Overvoltage generated ntawm DC sab

Yog hais tias lub inductance ntawm lub cut-off Circuit Court loj los yog tam sim no tus nqi ntawm lub sij hawm ntawm kev txiav yog loj, ib tug kuj loj overvoltage yuav generated. Qhov teeb meem no feem ntau tshwm sim thaum lub load raug txiav tawm, lub thyristor tau qhib, los yog lub fuse ntawm lub fuse ceev yog tshuab.

(3) Kev sib hloov hluav taws xob hluav taws xob

Xws li commutation overvoltage thiab commutation oscillating overvoltage. Lub commutation overvoltage yog tshwm sim los ntawm recombination ntawm residual carriers nyob rau hauv lub internal junction ntawm lub thyristor thaum lub tam sim no poob ntawm lub thyristor yog xoom, yog li nws kuj yog hu ua lub overvoltage los ntawm cov cab kuj tsub zuj zuj nyhuv. Tom qab lub commutation overvoltage, ib tug commutation oscillating overvoltage tshwm sim, uas yog ib tug oscillating voltage generated los ntawm lub resonance ntawm lub inductor thiab lub capacitor, thiab tus nqi yog muaj feem xyuam rau qhov rov qab voltage tom qab kawg ntawm lub commutation. Qhov siab dua qhov rov qab voltage, ntau dua qhov kev sib hloov oscillation overvoltage.

Cov txheej txheem sib txawv tuaj yeem raug coj los siv rau qhov sib txawv ntawm kev tsim cov overvoltage, xws li txo qhov overvoltage qhov chaw thiab attenuating lub overvoltage amplitude; suppressing tus nqi ntawm overvoltage zog nce, ncua lub dissipation tus nqi ntawm lub generated zog, thiab nce txoj kev ntawm dissipation; siv hluav taws xob circuits rau kev tiv thaiv. Tam sim no, feem ntau yog los txuas lub zog-absorbing Cheebtsam nyob rau hauv lub voj kom dissipate lub zog, feem ntau hu ua ib tug nqus voj voog los yog ib tug buffer circuit.

(4) RC nqus Circuit Court

Feem ntau, lub overvoltage muaj ntau zaus, yog li cov capacitor feem ntau siv los ua cov khoom nqus dej. Txhawm rau tiv thaiv oscillation, damping resistor feem ntau ntxiv los ua RC nqus Circuit Court. Lub RC tank tuaj yeem txuas rau AC sab, DC sab ntawm lub voj voog, lossis rau lub anode thiab cathode ntawm thyristor. Kev nqus hluav taws xob zoo dua yog qhov tsis yog-inductive capacitor, thiab cov xaim yuav tsum luv li sai tau.

(5) Lub nqus hluav taws xob muaj cov khoom tsis sib xws xws li selenium pawg thiab varistor

Vim lub peev xwm loj tam sim no ntawm lub varistor, qhov seem voltage yog tsawg, thiab lub peev xwm overvoltage muaj zog; cov xau tam sim no me me, tsis muaj kev ywj pheej tom qab tso tawm, thiab qhov nominal voltage theem ntawm cov khoom yog loj, uas yooj yim rau cov neeg siv xaiv; volt-ampere yam ntxwv yog symmetrical. Nws tuaj yeem siv rau AC, DC lossis qhov zoo thiab qhov tsis zoo; yog li ntawd, nws yog dav siv.

2, tiv thaiv tam sim no

Vim tias qhov loj me me thiab lub peev xwm kub me me ntawm cov khoom siv hluav taws xob semiconductor, tshwj xeeb tshaj yog rau cov khoom siv hluav taws xob siab thiab cov khoom siv hluav taws xob siab tam sim no xws li thyristors, qhov kub ntawm qhov sib txuas yuav tsum tau tswj nruj me ntsis, txwv tsis pub nws yuav raug puas tsuaj. Thaum lub sij hawm tam sim no ntau tshaj qhov ntsuas tus nqi ntws hauv thyristor, lub tshav kub tsis ncav cuag lub emission, yog li ntawd qhov kub thiab txias ntawm qhov sib txuas tau nce sai heev, thiab thaum kawg lub hlws ris txheej yog hlawv tawm.

Qhov ua rau overcurrent muaj ntau yam, piv txwv li, lub thyristor ntawm lub converter nws tus kheej puas lawm, lub trigger Circuit Court yog faulty, tswj system faulty, thiab AC fais fab mov voltage siab dhau lawm, tsawg dhau los yog ploj lawm theem, load overload los yog luv Circuit Court, theem Neighbor cov cuab yeej tsis ua hauj lwm, thiab lwm yam.

Feem ntau siv thyristor overcurrent tiv thaiv txoj kev yog lub fuse ceev. Txij li thaum tus yam ntxwv fuse ntawm cov fuse zoo tib yam qeeb dhau, lub thyristor tau raug hlawv ua ntej lub fuse tau tawg; Yog li ntawd, nws tsis tuaj yeem siv los tiv thaiv thyristor. Lub tshuab nrawm nrawm yog embedded hauv quartz xuab zeb los ntawm nyiaj fuse. Lub sijhawm fuse yog luv heev thiab tuaj yeem siv los tiv thaiv thyristor.