Yuav ua li cas tiv thaiv tam sim no rov qab hauv diodes hauv cov cuab yeej kho mob?

Ib, Txoj Cai ntawm Kev Tiv Thaiv Rov Qab: Unidirectional conductivity ntawm PN hlws ris
Cov qauv tseem ceeb ntawm lub diode yog PN kev sib tshuam, tsim los ntawm kev sib xyaw ntawm P-hom semiconductor (nrog ntau qhov) thiab N- hom semiconductor (nrog ntau cov electrons dawb). Nws anti backflow muaj nuj nqi yog raws li nram no lub cev mechanisms:

Kev ua tau zoo: Thaum P davhlau ya nyob twg txuas nrog qhov zoo electrode thiab N davhlau ya nyob twg txuas nrog qhov tsis zoo electrode, qhov hluav taws xob siv hluav taws xob ua rau hluav taws xob tsis muaj zog hauv PN hlws ris, ua rau cov nqa khoom sib txuas thiab tsim cov khoom siv tam sim no, tso cai rau tam sim no los ntawm P mus rau N.
Rov qab txiav tawm: Thaum N lub davhlau ya nyob twg txuas nrog qhov zoo electrode thiab P davhlau ya nyob twg txuas nrog qhov tsis zoo electrode, ib qho hluav taws xob sab nraud yog siv los txhim kho cov hluav taws xob sab hauv, nthuav dav cov txheej txheem depletion, cuam tshuam cov nqi thauj khoom, thiab tsuas yog tso cai me me rov qab xau tam sim no (feem ntau nanoampere theem).
Qhov no unidirectional conductivity ua rau lub diode ib tug natural 'tam sim no ib tug - txoj kev valve'. Piv txwv li, ib tug Schottky diode (xws li SS14) yog kev cob cog rua nyob rau hauv parallel mus rau lub hwj chim input ntawm lub portable ultrasound sojntsuam. Thaum lub hwj chim polarity thim rov qab, lub diode txiav tawm nyob rau hauv qhov kev coj rov qab, thaiv txoj kev tam sim no thiab tiv thaiv cov hluav taws xob sab hauv los ntawm kev kub hnyiab.

2, Cov xwm txheej ntawm daim ntawv thov hauv cov khoom siv kho mob
1. Portable cov khoom siv kho mob: sib npaug ntawm kev siv hluav taws xob tsawg thiab kev ntseeg siab
Hauv cov khoom siv xws li cov ntsuas ntshav qabzib thiab cov khoom siv hluav taws xob portable, Schottky diodes yog qhov kev xaiv zoo tshaj plaws los tiv thaiv kev rov qab los vim lawv qhov qis qis qis qis (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 raug 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 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 tau nruj 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, 6N137 optocoupler yog siv los ua kom tau hluav taws xob cais thiab thaiv cov 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, Lub tswv yim los tiv thaiv rov qab kev daws teeb meem: kev sib koom tes tsim ntawm 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.
3. Kev daws teeb meem zoo tshaj plaws diode: kev sib koom ua ke thiab kev txawj ntse
Nrog rau qhov muaj koob meej ntawm cov ntaub ntawv dav dav, kev sib xyaw ua ke zoo tshaj plaws diodes (xws li LM66100DCK) tau dhau los ua qhov kev xaiv zoo tshaj plaws rau siab - cov khoom siv kho mob kawg. Nws txoj haujlwm ua haujlwm yog raws li hauv qab no:

Fais fab adapter mov: Txiav HOM-C tso zis los ntawm PMOS txiav tawm sab hauv.
HOM-C fais fab mov: tso zis 5V voltage los ntawm PMOS conduction sab hauv.
Roj teeb powered: Thaum ob qho tib si point A thiab point C muaj peev xwm ntawm 0V, lub PMOS sab hauv ua thiab lub roj teeb muab lub zog rau lub nra.
Cov tshuaj no muaj qhov zoo ntawm kev tiv thaiv kev tiv thaiv, txo qis qis, tsis muaj kev tiv thaiv sab hauv, thiab tsis tshua muaj cua sov, thiab yog siv dav hauv portable ultrasound, endoscope thiab lwm yam khoom siv.