Yuav ua li cas diodes tiv thaiv tam sim no surges nyob rau hauv tseem ceeb kos npe saib xyuas?

Ib, tam sim no surge txaus ntshai nyob rau hauv tseem ceeb kos npe rau saib xyuas cov cuab yeej
Cov qauv tseem ceeb ntawm cov cuab yeej saib xyuas qhov tseem ceeb muaj xws li photoelectric sensors, bioelectric tej zaum yuav tau circuits, thiab chav tswj fais fab. Qhov kev pheej hmoo nce siab tam sim no feem ntau yog los ntawm cov xwm txheej hauv qab no:

Fais fab input davhlau ya nyob twg: Thaum lub sij hawm ua hauj lwm ntawm mains nthwv dej los yog lub roj teeb them thiab tso tawm, transient voltage spikes tej zaum yuav tshaj cov cuab yeej tiv taus voltage tus nqi, ua rau Circuit Court breakdowns.
Sensor interface: Photodiodes (PPG sensors) raug cuam tshuam rau ib puag ncig lub teeb cuam tshuam los yog electrostatic paug thaum tau txais cov teeb pom kev zoo, ua rau lub teeb liab dhau.
Bioelectric tej zaum yuav tau: Thaum ECG electrodes tuaj rau hauv kev sib cuag nrog daim tawv nqaij, lub sij hawm high voltage tej zaum yuav raug generated los ntawm tib neeg hluav taws xob zoo li qub los yog electromyography cuam tshuam, uas yuav ua rau lub preamplifier puas.
High zaus hloov fais fab mov: Sab hauv DC-DC converters tej zaum yuav ua rau voltage ringing thiab electromagnetic cuam tshuam (EMI) vim tsis zoo diode rov qab cov yam ntxwv thaum lub sij hawm hloov.
2, Lub hauv paus ntsiab lus tseem ceeb ntawm diode los tiv thaiv kev kub ntxhov tam sim no
1. Transient Voltage Suppression (TVS): Ib "kev nyab xeeb valve" nrog nanosecond qib teb
TVS diodes sai sai ua thaum qhov hluav taws xob tshaj qhov hluav taws xob tawg (Vbr) los ntawm cov yam ntxwv uas tsis yog-linear volt ampere, clamping lub overvoltage mus rau qhov chaw nyab xeeb. Nws lub sijhawm teb yog tsawg li 1ps, uas tuaj yeem nqus tau lub zog hloov pauv xws li xob laim thiab ESD. Piv txwv li, nyob rau hauv lub LED tsav tsheb Circuit Court ntawm ib tug mem tes oximeter, ib tug bidirectional TVS diode (xws li SMAJ5.0A) muaj peev xwm ib txhij suppress zoo thiab tsis zoo voltage spikes, tiv thaiv lub photodiode los ntawm electrostatic shock.

2. Rov qab rov qab feature optimization: tshem tawm cov suab nrov hloov
Fast rov qab diodes (FRDs) thiab Schottky diodes txo voltage ringing nyob rau hauv siab - zaus hloov fais fab mov los ntawm shortening lub sij hawm rov qab (TRR). Piv txwv li, hauv DC-DC converter ntawm ECG tau txais Circuit Court, MBR30200PT Schottky diode (trr<5ns) is used to avoid the superposition of reverse current and MOSFET turn off process, reduce EMI interference, and ensure the purity of ECG signal.

3. Kev tiv thaiv tam sim no: pib muag muag thiab kev tswj xyuas thermal
Txuas lub NTC thermistor nyob rau hauv series nrog lub hwj chim input davhlau ya nyob twg, thiab siv nws txias siab kuj nqi (xws li 5 Ω rau 5D-9 qauv ntawm 25 degree) txwv tsis pub lub surge tam sim no thaum powered. Tom qab qhov tam sim no heats li, tus nqi kuj poob rau<1 Ω, achieving soft start. For example, a certain model of portable monitor adopts an NTC+relay combination scheme to suppress the impulse current of 220V AC input from 300A to 60A, with a reduction of over 80%.

4. Clamping thiab voltage stabilization: tiv thaiv rhiab circuits
Zener diodes muab qhov kev siv hluav taws xob ruaj khov rau bioelectric muaj peev xwm amplifiers los ntawm qhov hluav taws xob tsis tu ncua hauv thaj tsam thim rov qab. Piv txwv li, AD8233 nti series integrates ib tug voltage regulator diode nyob rau hauv, uas muaj peev xwm compress lub input voltage fluctuation ntau yam ntawm lub ECG teeb liab amplification Circuit Court los ntawm ± 20% mus rau ± 1%, xyuas kom meej qhov tseeb ntawm lub plawv dhia ntsuas.

3, Cov xwm txheej ntawm daim ntawv thov thiab kev daws teeb meem
1. Kev tiv thaiv ntawm photoplethysmography (PPG) sensor
Nyob rau hauv lub oximeter, lub liab LED (660nm) thiab infrared LED (940nm) alternately emit lub teeb, thiab lub photodiode tau txais lub reflected lub teeb thiab hloov mus rau hauv ib tug hluav taws xob teeb liab. Txhawm rau tiv thaiv ESD cuam tshuam, ib qho kev sib txuas ntawm TVS diode (xws li P6SMB15CA) yuav tsum tau txuas nrog tib lub sijhawm ntawm lub sensor interface, nrog lub clamping voltage ntawm 15V, uas tuaj yeem nqus ± 8kV ntawm electrostatic paug zog. Nyob rau tib lub sijhawm, Schottky diodes (xws li BAT54S) tau txuas nrog hauv series hauv LED tsav Circuit Court kom txo tau lub zog siv hluav taws xob los ntawm kev siv lawv cov hluav taws xob qis qis (0.15V) thiab zam LED lifespan degradation los ntawm ntau dhau tam sim no.

2. Kev tiv thaiv ntawm ECG bioelectric tej zaum yuav tau Circuit Court
Thaum ECG electrodes tuaj rau hauv kev sib cuag nrog daim tawv nqaij, tib neeg hluav taws xob zoo li qub tuaj yeem tsim ntau txhiab volts ntawm qhov hluav taws xob hloov pauv. Los ntawm paralleling TVS diodes (xws li SMAJ12CA) ntawm cov khoom siv hluav taws xob, qhov hluav taws xob tuaj yeem raug clamped rau hauv qab 12V, tiv thaiv lub preamplifier (xws li AD8221) los ntawm kev puas tsuaj. Tsis tas li ntawd, tus choj rectifier Circuit Court + NTC thermistor ua ke yog siv ntawm lub hwj chim tawm tswv yim kawg txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau cuam tshuam los ntawm qhov hloov pauv ntawm lub zog nthwv dej thiab ua kom muaj kev ruaj ntseg ntawm ECG teeb liab tau txais.

3. Portable ntaus ntawv tswj fais fab
Nyob rau hauv cov saib portable xws li cov kauj-toog npab ntse, lub roj teeb them thiab tawm hluav taws xob yuav tsum tau tiv nrog kev kub ntxhov tam sim no. Los ntawm kev siv SiC Schottky diodes (xws li C6D10065A) es tsis txhob siv cov tshuaj silicon diodes, lub sij hawm rov qab rov qab yog nyob ze rau xoom, uas tuaj yeem txo qis kev hloov pauv los ntawm 60% thiab tiv taus tam sim no ntawm 100A, zam kev puas tsuaj los ntawm cov roj teeb overcharging lossis luv circuits. Tsis tas li ntawd, ib qho ESD tiv thaiv diode (xws li ESD5D150TA) tau koom ua ke ntawm USB charging interface kom tso tawm ± 15kV hluav taws xob zoo li qub thiab tiv thaiv cov khoom siv hluav taws xob sab hauv.