Yuav ua li cas diodes ua tiav kev tiv thaiv overcurrent hauv cov cuab yeej kho mob?

Ib, Lub hauv paus ntsiab lus ntawm diode overcurrent tiv thaiv
Lub hom phiaj tseem ceeb ntawm kev tiv thaiv overcurrent yog txwv tsis pub muaj kev puas tsuaj ntawm qhov txawv txav mus rau cov khoom siv hluav taws xob, thiab diodes ua tiav txoj haujlwm no los ntawm cov yam ntxwv hauv qab no:

Unidirectional conductivity: Ib lub diode tsuas yog tso cai rau tam sim no los ntawm lub anode mus rau cathode, thaiv qhov rov qab tam sim no. Qhov no feature ua rau nws ib tug tseem ceeb tivthaiv rau kev tiv thaiv rov qab tiv thaiv. Piv txwv li, nyob rau hauv lub hwj chim input davhlau ya nyob twg ntawm ib tug portable ultrasound sojntsuam, parallel Schottky diodes (xws li SS14) muaj peev xwm tiv thaiv tam sim no backflow tshwm sim los ntawm rov qab polarity ntawm lub hwj chim mov thiab tsis txhob sab hauv Circuit Court burnout.
Forward voltage poob yam ntxwv: Thaum tam sim no dhau los ntawm diode, qhov hluav taws xob poob ntawm kwv yees li 0.2V (Schottky diode) mus rau 0.7V (silicon PN junction diode) yog tsim los ntawm ob qho kawg. Los ntawm kev siv tus yam ntxwv no, ib qho kev txwv tam sim no tuaj yeem tsim tau. Piv txwv li, nyob rau hauv lub hwj chim module ntawm ib tug phais neeg hlau, ntau 1N4007 rectifier diodes yog txuas nrog nyob rau hauv series los txwv qhov siab tshaj plaws tso zis tam sim no los ntawm voltage poob superposition thiab tiv thaiv lub cev muaj zog overload.
Rov qab cov yam ntxwv: Thaum qhov hluav taws xob thim rov qab tshaj nws qhov kev puas tsuaj, Zener diode yuav nkag mus rau hauv lub xeev ruaj khov, clamping qhov hluav taws xob nyob rau hauv qhov chaw nyab xeeb. Qhov no feature yog dav siv nyob rau hauv lub overvoltage / overcurrent composite tiv thaiv cov khoom kho mob. Piv txwv li, nyob rau hauv gradient magnetic teb amplifier ntawm magnetic resonance imaging (MRI), Zener diode ua hauj lwm ua ke nrog lub fuse. Thaum qhov tam sim no tshaj qhov pib, lub Zener diode tawg thiab ua, ua rau lub fuse kom yaj thiab txiav tawm hauv Circuit Court.
2, Cov xwm txheej ntawm daim ntawv thov hauv cov khoom siv kho mob
1. Portable kho mob cov cuab yeej: sib npaug qis zog noj thiab muaj kev ntseeg siab
Schottky diodes yog nyiam nyob rau hauv cov khoom xws li cov ntshav qabzib ntsuas thiab portable electrocardiographs vim lawv qis rau pem hauv ntej voltage poob (0.15-0.45V). Piv txwv li, ib qho qauv ntawm cov ntshav ntsuas ntshav siv BAT54S dual Schottky diode array kom ua tiav cov haujlwm hauv qab no:

Anti rov qab kev twb kev txuas tiv thaiv: parallel txuas nrog lub hwj chim input davhlau ya nyob twg. Thaum lub hwj chim polarity thim rov qab, lub diode yuav thim rov qab thiab txiav tawm, thaiv txoj kev tam sim no.
Kev xaiv txoj kev fais fab: Hauv ob lub roj teeb hluav taws xob, cov khoom siv hluav taws xob tseem ceeb thiab cov khoom siv hluav taws xob tau hloov pauv los ntawm diodes kom ntseeg tau tias lub zog txuas ntxiv mus.
Kev tiv thaiv kev txwv tam sim no: txuas nrog hauv series nrog lub cev muaj zog tsav Circuit Court, siv hluav taws xob poob los txwv qhov pib tam sim no thiab tiv thaiv kom tsis txhob muaj kev kub ntxhov tam sim no thaum lub cev muaj zog kaw.
2. Cov cuab yeej siv kho mob siab zog: cuam tshuam tsis kam thiab kev ua kom zoo dua qub
Hauv cov khoom siv xws li defibrillators thiab siab - rab riam fais fab, nws yog ib qho tsim nyog los daws cov kev kub ntxhov tam sim no. Nyob rau ntawm lub sijhawm no, ceev rov qab diodes (FRDs) thiab silicon carbide (SiC) diodes dhau los ua cov khoom tseem ceeb:

Defibrillator charging circuit: MBR30200PT Schottky module (30A/200V) yog siv, nrog lub sij hawm rov qab (trr) tsawg dua 5ns, uas tuaj yeem tiv thaiv qhov hluav taws xob tsis zoo los ntawm diode hloov qeeb thaum them nyiaj thiab tiv thaiv siab -voltage capacitors los ntawm overvoltage breakdown.
High zaus hluav taws xob riam tso zis theem: siv C6D10065A SiC Schottky diode (100A / 650V), nws qis rau pem hauv ntej voltage poob (1.5V) thiab kub kub kuj yam ntxwv (175℃hlws ris kub) xyuas kom meej tias lub diode tus kheej lub hwj chim noj yog txo los ntawm 60% thaum lub sij hawm 1MHz siab -frequency degrading.
3. Cov cuab yeej kho mob Precision: teeb liab kev ncaj ncees thiab tiv thaiv -kev cuam tshuam tsim
Hauv cov khoom siv xws li electrocardiographs thiab electroencephalographs, kev nrhiav tau ntawm cov teeb liab bioelectric tsis muaj zog yuav tsum muaj kev nruj ntawm lub suab nrov. Lub sijhawm no, kev sib koom tes tsim ntawm photodiodes thiab kev tiv thaiv diodes dhau los ua qhov tseem ceeb:

Optoelectronic coupling isolation: Nyob rau hauv lub teeb liab input channel, ib tug 6N137 optocoupler yog siv los ua kom tau hluav taws xob cais thiab thaiv hom kev cuam tshuam los ntawm photoelectric hloov dua siab tshiab ntawm diodes.
Kev tiv thaiv ESD: Ntawm lub sensor interface, thaum uas tig mus ESD5D150TA Schottky diode nrog tsawg to tam sim no (<0.1 μ A) and high reverse withstand voltage (150V) can effectively discharge the transient current generated by electrostatic discharge (ESD) and prevent sensor damage.
3, Kev tsim kho tshiab: kev sib koom ua ke tiv thaiv diodes thiab lwm yam khoom
1. Composite tiv thaiv Circuit Court: diode + TVS diode
Nyob rau hauv daim duab kis tau tus mob ntawm kev kho mob endoscopes, ib tug composite tiv thaiv tswvyim ntawm "Schottky diode + TVS diode" yog saws los tiv thaiv overvoltage los ntawm xob laim ntaus los yog hluav taws xob zoo li qub:

Schottky diode: parallel txuas nrog lub hwj chim input davhlau ya nyob twg, muab kev tiv thaiv kev thim rov qab txhua hnub.
TVS diode: series txuas nrog lub teeb liab kab, nws lub sijhawm teb ceev ceev (<1ps) and low clamping voltage (such as SMAJ5.0A's clamping voltage of 7.8V) can limit overvoltage within a safe range in nanoseconds, protecting the downstream ADC chip from damage.
2. Kev tiv thaiv tus kheej: diode + PTC thermistor
Hauv kev them nqi hluav taws xob ntawm cov khoom siv kho mob uas siv tau (xws li cov hlua tes ntse), kev tiv thaiv tus kheej ntawm "Schottky diode + PTC thermistor" tau txais yuav:

Schottky diode: tiv thaiv lub roj teeb rov qab kev sib txuas thaum siv nws cov yam ntxwv qis qis kom txo qis kev them nyiaj.
PTC thermistor: series txuas nrog rau txoj kev them nyiaj, thaum lub sijhawm tam sim no tshaj qhov pib, PTC kuj tus nqi nce siab, txwv qhov tam sim no; Tom qab kev daws teeb meem, PTC cia li rov qab mus rau lub xeev tsis muaj zog yam tsis tas yuav hloov cov khoom.