Lub luag haujlwm ntawm diodes hauv kev kho mob fais fab adapters yog dab tsi?

1, Rectification: cov ntsiab lus tseem ceeb uas hloov pauv tam sim no rau hauv kev nyab xeeb tam sim no
Kev kho mob fais fab adapters yuav tsum tau hloov lub zog hluav taws xob (220V / 50Hz AC) rau hauv qis -voltage DC fais fab (xws li 5V, 12V) xav tau los ntawm cov khoom siv. Lub ntsiab txuas ntawm cov txheej txheem no yog rectification, thiab lub diode ua tiav txoj haujlwm no los ntawm tus choj rectifier Circuit Court. Tus choj rectifier Circuit Court muaj plaub lub diodes tsim "bridge caj npab". Txawm hais tias cov tswv yim yog qhov zoo lossis qhov tsis zoo ib nrab ntawm lub voj voog, ob qho kawg ntawm qhov kev thauj khoom tuaj yeem tau txais DC voltage ntawm tib lub polarity, ob npaug ntawm zaus mus rau 100Hz, muab lub hauv paus rau kev lim dej tom ntej.

Cov ntsiab lus tseem ceeb thiab kev xaiv xaiv:

Qhov zoo voltage poob (Vf): ncaj qha cuam tshuam rau kev hloov dua siab tshiab. Tus nqi ntawm silicon diodes yog 0.7V, thaum Schottky diodes tuaj yeem qis li 0.3-0.5V. Hauv qhov tsis tshua muaj hluav taws xob thiab cov xwm txheej tam sim no siab (xws li cov khoom siv hluav taws xob siv hluav taws xob siv hluav taws xob), Schottky diodes (xws li ESD3V3E0017LA) tuaj yeem txo qhov kev poob qis.
Rov qab Voltage Resistance (VRRM): Nws yuav tsum tau npog lub ncov voltage ntawm lub mains (311V) thiab surge cuam tshuam. Kev kho mob qib fais fab adapters feem ntau siv diodes nrog rau qhov hluav taws xob tiv taus ntau dua lossis sib npaug ntawm 600V (xws li GBJ2510) kom muaj kev nyab xeeb ua haujlwm txawm tias thaum muaj hluav taws xob hloov pauv lossis xob laim.
Reverse recovery time (trr): Under high-frequency switching, ordinary diodes with trr>1 μs yuav ua rau lub ncov rov qab los tam sim no, nce kev poob thiab zoo siab EMI cuam tshuam. Cov khoom siv hluav taws xob kho mob yuav tsum siv cov diodes rov qab sai (TRR<100ns) or Schottky diodes to reduce the interference of high-frequency noise on precision medical equipment (such as electrocardiographs).
2, Voltage stabilization: qhov txuas tseem ceeb los xyuas kom muaj kev ruaj ntseg ntawm cov zis hluav taws xob
Cov cuab yeej kho mob yuav tsum muaj zog heev ruaj khov. Piv txwv li, cov twj tso kua mis yuav tsum tau tswj xyuas tus nqi txaus, thiab lawv cov khoom siv hluav taws xob hloov pauv yuav tsum tau tswj tsis pub dhau ± 1%. Diodes koom nrog kev tswj hluav taws xob los ntawm cov hauv qab no:

Zener diode (voltage regulator): Siv cov yam ntxwv ntawm qhov hluav taws xob tsis tu ncua ntawm thaj tsam rov qab tawg, nws txuas nrog hauv cov kab nrog tam sim no limiting resistor los tsim ib qho yooj yim voltage regulator circuit. Hauv qis- lub zog pabcuam hluav taws xob ntawm cov khoom siv kho mob, Zener diodes tuaj yeem muab cov kev siv hluav taws xob ruaj khov.
Schottky diode thiab synchronous rectification technology: Nyob rau hauv siab - zaus hloov cov khoom siv hluav taws xob, qhov qis rau pem hauv ntej voltage poob (0.3V) ntawm Schottky diodes (xws li 1N5819) tuaj yeem txo qhov kev poob qis, thiab thaum ua ke nrog MOSFETs kom ua tiav synchronous rectification, qhov kev ua tau zoo tshaj 9% tuaj yeem txhim kho.
3, Kev Tiv Thaiv: lub hauv paus tseem ceeb rau kev tsim ntau yam kev tiv thaiv kev ruaj ntseg
Cov cuab yeej kho mob yuav tsum ua raws li cov qauv kev nyab xeeb nruj xws li IEC 60601-1, thiab diodes ua lub luag haujlwm tiv thaiv hauv cov xwm txheej hauv qab no:

Kev tiv thaiv rov qab kev sib txuas tiv thaiv: Rov qab cov diodes rov qab txuas nrog ntawm lub hwj chim tawm tswv yim kawg los tiv thaiv cov neeg siv los ntawm kev cuam tshuam ntawm lub zog hluav taws xob thiab ua rau cov khoom puas tsuaj. Piv txwv li, hauv cov khoom siv hluav taws xob defibrillator, TVS diode (xws li SMAJ15CA) tuaj yeem ua tau sai thaum qhov hluav taws xob thim rov qab ntau dua 15V, hloov qhov tam sim no mus rau hauv av thiab tiv thaiv cov hluav taws xob sab hauv.
Kev tiv thaiv kev kub hnyiab: Kev hloov hluav taws xob tsis zoo (xws li xob laim) los ntawm lub ntsiab yuav ua rau lub hwj chim adapter puas. Lub sij hawm teb ntawm TVS diode yog tsawg dua 1ns, uas tuaj yeem clamp surge voltage mus rau qhov muaj kev nyab xeeb (xws li hauv 5V), kom ntseeg tau tias cov khoom siv kho mob tseem tuaj yeem ua haujlwm ib txwm nyob hauv qhov chaw huab cua.
Kev tiv thaiv ESD: Cov cuab yeej kho mob ua haujlwm nyob rau hauv ib puag ncig nyuaj nrog cov xwm txheej ESD nquag. ESD tiv thaiv diodes (xws li ESD5V3U1UB-TC) tuaj yeem tiv taus ± 15kV huab cua tawm los tiv thaiv cov khoom siv tsis ua haujlwm los ntawm electrostatic tawg.
4, Efficiency optimization: lub tshuab tseem ceeb rau kev txhim kho kev siv hluav taws xob zoo
Cov kev xav tau ntawm lub zog siv rau cov khoom siv kho mob tau dhau los ua nruj. Lub diode optimizes efficiency ntawm lub hwj chim adapter los ntawm cov nram qab no technologies:

Synchronous rectification thev naus laus zis: siv MOSFETs uas tsis tshua muaj kev tiv thaiv los hloov cov diodes ib txwm muaj rau freewheeling, txo qis conduction los ntawm ntau tshaj 90%. Piv txwv li, hauv cov khoom siv hluav taws xob saib portable, synchronous rectification tuaj yeem ua kom muaj txiaj ntsig ntawm 85% mus rau 92% thiab txuas ntxiv roj teeb lub neej.
Mos switching thev naus laus zis: Kev sib txuas ceev rov qab diodes (xws li MUR160) nrog cov hluav taws xob resonant kom ua tiav xoom voltage hloov (ZVS) lossis xoom tam sim no hloov (ZCS), txo qis kev hloov pauv thiab txhim kho siab -frequency power efficiency.
5, Cov kev cai tshwj xeeb rau kev kho mob qib diodes
Cov kev xav tau rau diodes hauv cov khoom siv kho mob yog ntau dua li cov neeg siv khoom siv hluav taws xob, feem ntau xav txog hauv:

Tsawg to tam sim no: Tus neeg mob qhov kev txwv tam sim no (ib txwm lub xeev: DC<10 μ A, AC<100 μ A) requires a diode leakage current of<0.1 μ A at 25 ℃. Medical grade ESD diodes still require a leakage current of<0.5 μ A at high temperatures of 60 ℃.
Kev ntseeg siab: yuav tsum tau AEC-Q101 ntawv pov thawj (xws li 2000 teev ntawm siab-kub rov qab ntsuas ntsuas, 150℃/ 80% ntsuas hluav taws xob) kom ruaj khov ua haujlwm hauv cov xwm txheej ua haujlwm tsis tu ncua.
Biocompatibility: Cov khoom siv uas tuaj rau hauv kev sib cuag ncaj qha nrog cov neeg mob (xws li implantable sensor interfaces) yuav tsum ua tau raws li ISO 10993 tus qauv kom tsis txhob muaj cov khoom rhiab heev los yog toxicity txaus ntshai.
6, Cov ntaub ntawv thov raug
Portable ultrasound diagnostic instrument fais fab mov: txais ib tug choj rectifier + Schottky diode (1N5819) scheme kom ua tau raws li qhov sib txawv voltage thiab high efficiency rectification. Ua ke nrog synchronous rectification thev naus laus zis, lub zog ua haujlwm tau nce mus rau 91%, ua tau raws li qhov yuav tsum tau ua kom ntev ntev ntawm cov xwm txheej kub ntxhov.
Defibrillator fais fab adapter: Integrated TVS diode (SMAJ5.0CA) thiab ESD tiv thaiv diode, dhau IEC 60601-1-2 EMC kuaj kom ruaj khov tso zis nyob rau hauv high-voltage defibrillation pulse (5kV) cuam tshuam, ua kom cov neeg mob muaj kev nyab xeeb.
Insulin twj tso kua mis tswj fais fab: Lub tshuab hluav taws xob tswj hluav taws xob yog tsim los siv Zener diode (1N4742A) los muab qhov ruaj khov 3.3V siv hluav taws xob rau lub microcontroller, kom ntseeg tau tias kev xa cov tshuaj insulin tsis raug cuam tshuam los ntawm lub zog hloov pauv.