Yuav ua li cas siv diodes los tiv thaiv cov khoom tseem ceeb hauv cov cuab yeej kho mob?

Ib, Lub hauv paus ntsiab lus tiv thaiv ntawm diodes
1. Kev tiv thaiv overvoltage: clamp thiab txwv
Lub diode ua tiav qhov hluav taws xob clamping los ntawm kev thim rov qab cov yam ntxwv. Thaum muaj hluav taws xob hloov pauv hloov pauv tau tshwm sim hauv Circuit Court, Zener diode lossis TVS diode sai sai nkag mus rau hauv lub xeev avalanche tawg, txwv qhov hluav taws xob mus rau qhov chaw nyab xeeb. Piv txwv li, ntawm cov khoom siv hluav taws xob electrocardiograph, qhov rov qab sib npaug silicon diode tuaj yeem txwv qhov hluav taws xob nkag mus rau ± 600mV txhawm rau tiv thaiv siab -voltage pulses los ntawm kev puas tsuaj rau lub preamplifier. TVS diodes muaj picosecond teb ceev thiab tiv thaiv circuits nyob rau hauv xob laim ntaus los yog hluav taws xob ceev transients (EFT) cov xwm txheej. Lawv clamping voltage qhov tseeb tuaj yeem ncav cuag ± 5% thiab cov xau tam sim no tsawg dua 1 μ A.

2. Kev tiv thaiv overcurrent: nruam tam sim no thiab lub zog nqus
Nyob rau hauv inductive load circuits, diodes suppress thim rov qab electromotive quab yuam los ntawm freewheeling nkaus. Piv txwv li, nyob rau hauv lub voj voog tsav ntawm lub tshuab ua pa relay, sib npaug Schottky diodes muab txoj hauv kev rov qab tam sim no thaum lub relay raug kaw, tiv thaiv ntau pua ntawm cov hluav taws xob hloov hluav taws xob uas tsim los ntawm cov kauj los ntawm kev rhuav tshem cov tsav tsheb transistor. Nyob rau hauv lub cev muaj zog tswj circuits, ceev rov qab diodes (FRDs) nqus lub zog rov qab electromotive quab yuam ntawm lub cev muaj zog los ntawm kev ceev ceev thiab txiav tawm, tiv thaiv cov khoom siv hluav taws xob los ntawm voltage surges.

3. Electrostatic tiv thaiv: ESD tiv thaiv
Lub interface Circuit Court ntawm cov cuab yeej kho mob raug cuam tshuam rau tib neeg hluav taws xob zoo li qub lossis ib puag ncig cuam tshuam. ESD suppression diodes sai sai tso tawm lub zog zoo li qub hauv siab - cov kab teeb liab ceev xws li USB thiab HDMI vim lawv qhov tsis muaj peev xwm (<1pF) and high breakdown voltage (>20kV) yam ntxwv. Piv txwv li, nyob rau hauv ECG teeb liab interface ntawm lub portable saib, siv ib tug TVS diode array yuav txo tau cov electrostatic tawm voltage los ntawm 8kV mus rau ib tug muaj kev ruaj ntseg theem thaum tuav lub teeb liab kev ncaj ncees.

2, Cov ntawv thov scenario tsom xam
1. Kev tiv thaiv hluav taws xob
Lub hwj chim module ntawm cov cuab yeej kho mob yuav tsum tau tiv nrog kev hem thawj xws li lub zog hloov pauv thiab xob laim. Noj cov kev kho mob X-ray tshuab siab-voltage generator ua piv txwv, nws lub zog hluav taws xob siv lub silicon carbide (SiC) Schottky diode array, uas ua tiav kev tiv thaiv los ntawm cov txheej txheem hauv qab no:

Kev kho hluav taws xob siab: SiC diodes muaj qhov hluav taws xob tiv taus txog li 60kV thiab lub sijhawm rov qab los ntawm 20ns, uas yog 30% ntau dua li cov tsoos silicon diodes. Lawv tuaj yeem ruaj khov tso tawm kaum tawm kilovolts ntawm DC high voltage.
Surge absorption: Txuas hlau oxide varistors (MOVs) thiab TVS diodes nyob rau hauv parallel ntawm lub hwj chim input kawg los tsim ntau- qib tiv thaiv. MOV absorbs thawj surge zog, thaum TVS diode ntxiv clamps residual voltage los xyuas kom meej tias lub downstream Circuit Court tiv thaiv los ntawm kev cuam tshuam.
2. Kev tiv thaiv kev kis tau tus kab mob thiab kis tau tus mob
Nyob rau hauv bioelectric teeb liab kis tau tus mob, diodes tiv thaiv rhiab Cheebtsam los ntawm amplitude limiting thiab filtering. Piv txwv li:

Electrocardiogram input tiv thaiv: Txais ob-theem tiv thaiv Circuit Court, thawj theem yog cov roj tso tawm raj (GDT), uas txwv cov input voltage rau hauv ± 50V; Qhov thib ob theem yog qhov rov qab sib npaug silicon diode, uas txuas ntxiv qhov hluav taws xob mus rau ± 600mV, thaum tiv thaiv siab - zaus cuam tshuam los ntawm RC filtering network.
Fiber optic kev sib txuas lus interface: Hauv cov duab endoscopic kis tau tus mob, photodiodes yog siv ua ke nrog TVS diodes. Photodiodes hloov cov teeb liab teeb liab rau hauv cov teeb liab hluav taws xob, thaum TVS diodes tiv thaiv lawv los ntawm hluav taws xob zoo li qub lossis lub zog hloov pauv, ua kom muaj kev ruaj ntseg ntawm cov ntaub ntawv xa mus.
3. Lub zog tswj cov khoom siv kho mob
Hauv cov khoom siv kho mob laser, diodes tiv thaiv cov neeg mob thiab cov cuab yeej siv los ntawm kev tswj hwm lub zog tso zis. Piv txwv li:

Kev tswj hwm lub zog laser: Ib qho kev hloov pauv uas muaj lub diode rov qab sai thiab MOSFET yog siv los tswj kev tsav tsheb tam sim no ntawm lub laser diode los ntawm kev kho lub kaum sab xis ntawm lub diode, ua tiav cov zis hluav taws xob tsis tu ncua.
Kev ruaj ntseg interlock tiv thaiv: Lub photoelectric coupler yog ntsia ntawm kev sib txuas ntawm lub taub hau kho thiab cov khoom siv. Thaum lub taub hau kho tsis tau teeb tsa kom raug, lub photodiode tsis tuaj yeem ntes lub teeb liab teeb liab thiab txiav tawm lub laser tso tawm kom tsis txhob muaj teeb meem irradiation.
3, Technology xaiv thiab optimization lub tswv yim
1. Ntaus parameter sib piv
Voltage theem: Xaiv diodes nrog rov qab tawg voltage (Vbr) siab dua 1.5 npaug ntawm qhov siab tshaj voltage raws li kev khiav hauj lwm voltage ntawm lub circuit. Piv txwv li, hauv 220V AC input circuit, TVS diodes nrog Vbr Ntau dua lossis sib npaug rau 600V yuav tsum tau xaiv.
Tam sim no muaj peev xwm: Nyob rau hauv cov xwm txheej tiv thaiv overcurrent, qhov nruab nrab rectified tam sim no (Yog tias) ntawm lub diode yuav tsum ntau dua ob npaug ntawm qhov siab tshaj plaws kev khiav hauj lwm tam sim no ntawm Circuit Court. Piv txwv li, nyob rau hauv lub cev muaj zog tsav Circuit Court, ib tug ceev ceev rov qab diode nrog Yog Ntau tshaj los yog sib npaug rau 10A raug xaiv.
Teb ceev: Rau siab -frequency signal tiv thaiv, ua ntej TVS diodes los yog Schottky diodes nrog lub sij hawm teb (trr)<10ns.
2. Topology optimization
Kev tiv thaiv ntau theem: Txais peb - theem kev tiv thaiv architecture ntawm "GDT + MOV + TVS", GDT absorbs thawj surge zog, MOV suppresses intermediate overvoltage, TVS clamps residual voltage, thiab ua tiav lub zog attenuation kauj ruam.
Integrated tsim: Siv TVS diode arrays los yog ESD tiv thaiv modules los txo PCB layout qhov chaw. Piv txwv li, Littelfuse's SP1003 series TVS array tuaj yeem ua ke plaub lub teeb liab tiv thaiv ntawm ib nti, txo qhov cuam tshuam ntawm parasitic capacitance ntawm siab -ceev teeb liab.
3. Kev tswj cua sov thiab kev ntseeg tau
Thaum tshav kub kub dissipation tsim: Hauv siab - daim ntawv thov fais fab, diodes yuav tsum tau nruab nrog cov dab dej kub los yog cov dab dej kub. Piv txwv li, nyob rau hauv gradient amplifiers rau kev kho mob sib nqus resonance imaging (MRI), SiC Schottky diodes dissipate tshav kub los ntawm ib tug tooj liab substrate los xyuas kom meej qhov sib txuas kub hauv qab 150 degree.
Kev tsim kho tsis tu ncua: Parallel ntau lub diodes nyob rau hauv qhov tseem ceeb circuits los txhim kho kev ua txhaum cai kam rau ua. Piv txwv li, nyob rau hauv lub siab -voltage capacitor charging Circuit Court ntawm ib tug defibrillator, dual TVS diodes txuas nyob rau hauv parallel los tiv thaiv cov cuab yeej tsis ua hauj lwm los ntawm ib qho tsis ua hauj lwm point.