Dab tsi yog qhov kev tiv thaiv tam sim no ntawm diodes hauv cov cuab yeej siv tshuaj ntse?

1, Cov yam ntxwv tseem ceeb thiab kev tiv thaiv tam sim no ntawm diodes
Cov yam ntxwv tseem ceeb ntawm lub diode yog nws cov unidirectional conductivity - nws tsuas yog tso cai rau tam sim no hla mus rau pem hauv ntej thiab nthuav tawm lub xeev siab impedance nyob rau hauv txoj kev rov qab. Qhov no ua rau nws ua tiav ntau yam kev tiv thaiv tam sim no hauv circuits:

Rov qab txiav tawm kev tiv thaiv
Thaum cov khoom siv hluav taws xob ntsib qhov rov qab voltage surge (xws li rov qab polarity ntawm lub hwj huam mov, electrostatic paug, los yog electromagnetic cuam tshuam), lub diode sai nkag mus rau lub rov qab txiav tawm lub xeev, thaiv cov ntws ntawm tam sim no thiab tiv thaiv cov rhiab Cheebtsam (xws li microcontrollers thiab sensors) los ntawm kev puas tsuaj los ntawm rov qab tam sim no. Piv txwv li, hauv lub twj tso kua mis insulin ntse, yog tias lub hwj chim polarity yog yuam kev rov qab, lub diode tuaj yeem txiav tawm tam sim ntawd kom tsis txhob hlawv tawm ntawm lub cev muaj zog tsav los yog cov tshuaj tswj cov nti.
Transient Voltage Suppression (TVS)
Cov cuab yeej siv tshuaj ntse ntse feem ntau ntsib kev hloov pauv siab -voltage pulses tshwm sim los ntawm kev hloov pauv, lub cev muaj zog pib nres, lossis kev cuam tshuam ntawm hluav taws xob sab nraud. TVS diodes clamp transient voltage mus rau qhov muaj kev nyab xeeb nrog lub sij hawm teb luv luv (nanosecond level), tiv thaiv cov circuits tom ntej. Piv txwv li, hauv wireless charging modules, TVS diodes tuaj yeem nqus cov hluav taws xob hluav taws xob los ntawm cov coils los tiv thaiv overvoltage shocks thaum lub zog xa mus.
Voltage stabilization muaj nuj nqi
Zener diodes tswj cov zis hluav taws xob ruaj khov los ntawm kev thim rov qab cov yam ntxwv. Hauv cov cuab yeej xa tshuaj ntse, nws feem ntau yog siv los muab lub zog ruaj khov rau qis - lub zog ntsuas hluav taws xob lossis cov qauv sib txuas lus. Piv txwv li, nyob rau hauv implantable tshuaj tso tawm li, ib tug voltage regulator diode yuav xyuas kom meej tias lub microcontroller tseem yuav tau txais ib tug ruaj khov 3.3V fais fab mov txawm tias thaum lub roj teeb voltage fluctuates, tsis txhob noj cov tshuaj yuam kev tshwm sim los ntawm unstable voltage.
2, Cov xwm txheej ntawm daim ntawv thov ntawm diodes hauv cov khoom siv tshuaj ntse
1. Kev tiv thaiv kev tiv thaiv rov qab: tus nqi qis - kev tiv thaiv yooj yim txhim khu kev qha
Txuas diodes nyob rau hauv series ntawm lub hwj chim input ntawm ntse tshuaj xa cov cuab yeej yog qhov yooj yim thiab zoo tshaj plaws tov los tiv thaiv rov qab polarity ntawm lub hwj chim mov. Piv txwv li, lub portable nebulization tshuaj dispenser siv 1N4007 rectifier diode txuas nrog rau hauv series nrog lub hwj chim Circuit Court. Thaum tus neeg siv yuam kev teeb tsa lub roj teeb rov qab, lub diode thaiv qhov tam sim no kom tsis txhob muaj kev puas tsuaj rau lub cev muaj zog tsav lossis cov khoom cua sov. Txawm hais tias lub tswv yim no qhia txog qhov hluav taws xob qis dua li ntawm 0.7V (silicon tube), nws qhov cuam tshuam rau lub roj teeb lub neej tuaj yeem ua rau tsis zoo nyob rau hauv qis - cov khoom siv fais fab.

2. Kev tiv thaiv tam sim no tsis tu ncua: suppresses lub nraub qaum electromotive quab yuam ntawm inductive loads
Lub inductive loads xws li lub cev muaj zog thiab solenoid li qub hauv cov khoom siv tshuaj ntse ntse tuaj yeem tsim cov hluav taws xob rov qab thaum lub zog raug txiav tawm, uas yuav ua rau tawg ntawm cov tsav tsheb transistor lossis MOSFET. Lub freewheeling diode yog txuas nrog nyob rau hauv parallel rau ob qho tib si kawg ntawm inductive load, muab ib tug tawm txoj kev rau lub rov qab electromotive quab yuam thiab tiv thaiv lub switching caij. Piv txwv li, nyob rau hauv ib tug tsis siv neeg injector, ib tug Schottky diode (xws li 1N5819) yog kev cob cog rua nyob rau hauv parallel ntawm ob kawg ntawm lub stepper lub cev muaj zog uas tsav lub koob mus rau pem hauv ntej. Nws qhov qis qis rau pem hauv ntej poob qis (0.3V) thiab cov yam ntxwv rov qab sai tuaj yeem nqus tau lub zog cuam tshuam thaum lub cev muaj zog tawm, txuas lub neej ntawm kev tsav tsheb.

3. Clamp tiv thaiv: txwv qhov input voltage ntau ntawm ADC
Microcontrollers hauv cov cuab yeej siv tshuaj ntse ntse feem ntau saib xyuas cov teeb liab sensor xws li siab, ntws tus nqi, thiab kub los ntawm analog - rau - digital converters (ADCs). Yog hais tias lub sensor tso zis voltage tshaj ADC ntau, nws yuav ua rau lub nti. Los ntawm paralleling ib bidirectional clamp diode (xws li BAV99) ntawm lub tswv yim ntawm ADC, cov input voltage tuaj yeem txwv rau qhov kev nyab xeeb (xws li 0-3.3V). Piv txwv li, nyob rau hauv cov twj ntse infusion twj tso kua mis, clamp diodes tuaj yeem tiv thaiv cov sensors ntws los ntawm cov khoom siv hluav taws xob tsis zoo vim yog qhov tsis raug, tiv thaiv ADC module los ntawm kev puas tsuaj.

4. Kev tiv thaiv ib ntus: ua kom muaj kev ruaj ntseg ntawm kev sib txuas lus wireless
Cov cuab yeej siv tshuaj ntse ntse ua tiav cov ntaub ntawv xa mus lossis kev tswj chaw taws teeb los ntawm wireless technologies xws li Bluetooth thiab NFC. Wireless modules raug cuam tshuam los ntawm electromagnetic cuam tshuam, uas tuaj yeem ua rau muaj hluav taws xob tawg. TVS diodes (xws li SMAJ5.0A) txuas nrog nyob rau hauv parallel rau kav hlau txais xov interfaces lossis cov kab hluav taws xob tuaj yeem clamp qhov hluav taws xob hloov mus rau theem kev nyab xeeb hauv nanoseconds, tiv thaiv kev sib txuas lus cuam tshuam lossis cov ntaub ntawv poob. Piv txwv li, hauv cov khoom siv tshuaj xyuas cov tshuaj tiv thaiv, TVS diodes tuaj yeem tiv thaiv kev cuam tshuam ntawm electromagnetic cuam tshuam thaum lub xov tooj ntawm tes thiab lwm yam khoom siv mus kom ze, ua kom muaj kev ruaj ntseg ntawm Bluetooth cov ntaub ntawv xa mus.

3, Cov ntsiab lus tseem ceeb rau kev xaiv diode thiab kev tsim hluav taws xob
1. Parameter matching: Xaiv cov yam ntxwv tsis raws li daim ntawv thov scenario
Rov qab tawg qhov hluav taws xob (Vbr): Nws yuav tsum siab tshaj qhov siab tshaj qhov rov qab voltage ntawm lub voj voog thiab khaws cov npoo kev nyab xeeb (xws li 20% lossis ntau dua).
Qhov zoo tam sim no (Yog tias): Nws yog ib qho tsim nyog yuav tsum ua kom tau raws li qhov siab tshaj plaws ntawm kev ua haujlwm tam sim no ntawm cov khoom siv kom tsis txhob muaj cua sov thiab kev puas tsuaj.
Rov qab lub sij hawm rov qab (Trr): Nyob rau hauv siab - zaus hloov circuits, diodes nrog luv Trr (xws li Schottky diodes) yuav tsum tau xaiv los txo qhov poob.
Daim ntawv ntim: Xaiv SMD lossis DIP ntim raws li qhov chaw txwv ntawm lub cuab yeej, thiab xav txog qhov yuav tsum tau ua kom sov.
2. Circuit Court layout optimization: txo qhov cuam tshuam ntawm cov kab mob parasitic
Txo cov hlau lead ntev: txo cov kab mob parasitic inductance thiab txo qhov kev pheej hmoo ntawm siab - zaus oscillation.
Ua kom tooj liab ntawv ci cheeb tsam: Txhim kho cov cua sov thiab tiv thaiv kev ua haujlwm ntawm diodes vim overheating.
Multi diode parallel kev sib txuas: Hauv cov xwm txheej tam sim no, ntau lub diodes txuas nrog rau kev sib txuas kom tawg tam sim no thiab txhim kho kev ntseeg tau.
3. Kev tsim tsis tu ncua: Txhim kho qhov kev ua txhaum kev ua siab ntev
Kev siv lub diode dual sib npaug lossis cov qauv hauv cov txheej txheem tiv thaiv tseem ceeb los txhim kho kev tiv thaiv - muaj peev xwm cuam tshuam. Piv txwv li, nyob rau hauv implantable tshuaj xa khoom, lub hwj chim input davhlau ya nyob twg txais ib tug dual diode series anti rov qab tsim, uas muaj peev xwm muab kev tiv thaiv txawm tias ib tug diode tsis ua hauj lwm.