Cov txheej txheem:
Video: Txo Kev Siv Lub Hwj Hwj Hwj Hwj Hwj Huv - Tuav Tawm Ntawm Qhov Txais Tam Sim No: 3 Kauj Ruam
2024 Tus sau: John Day | [email protected]. Kawg hloov kho: 2024-01-30 09:25
Feem ntau cov xa tawm xav tau tam sim no ntau dua los ua qhov pib tshaj li qhov xav tau los tuav cov xa tawm thaum cov neeg tau kaw lawm. Qhov tam sim no xav tau los tuav lub relay ntawm (Tuav tam sim no) tuaj yeem muaj tsawg dua li qhov pib tam sim no yuav tsum tau ua nws (Txais tam sim no). Qhov no txhais tau tias muaj peev xwm txuag hluav taws xob ntau yog tias peb tuaj yeem tsim lub voj voog yooj yim los txo qhov tam sim no muab rau kev xa tawm thaum nws tau hloov pauv.
Hauv cov lus qhia no peb sim (ua tiav) nrog lub voj voog yooj yim kom ua tiav txoj haujlwm no rau ib tus qauv ntawm 5VDC kev xa tawm. Pom tseeb nyob ntawm hom kev xa tawm qee qhov kev tivthaiv qhov tseem ceeb yuav tsum tau hloov kho, tab sis txoj kev piav qhia yuav tsum ua haujlwm rau feem ntau DC kev xa tawm.
Kauj Ruam 1: Qhia Tus Kheej
Txhawm rau pib, Kuv ntsuas qhov tam sim no tau siv los ntawm kev xa tawm ntawm ntau qhov sib txawv thiab tseem xam tawm ntawm qhov hluav taws xob qhov kev xa tawm yuav poob ntawm li qhov hluav taws xob tau qis dua. Los ntawm qhov no peb tseem tuaj yeem txheeb xyuas qhov cuam tshuam ntawm lub zog txuas ntawm qhov sib txawv siv R = V/I. Nws tseem nyob ruaj khov hauv kwv yees li ntawm 137 ohm txog 123 ohm ntau. Koj tuaj yeem pom kuv cov txiaj ntsig rau qhov kev xa tawm hauv daim duab no.
Vim tias qhov kev xa tawm poob qis txog 0.9 volts lossis nrog txog 6 txog 7 ma ntawm cov dej ntws tam sim no, peb yuav tsom kom muaj li 1.2 volts hla cov kauj lossis kwv yees li 9 txog 10 ma ntawm cov dej tam sim no hauv lub xeev tuav. Qhov no yuav muab me ntsis ntawm cov npoo saum toj saud tawm.
Kauj ruam 2: Daim duab Circuit Court
Ib daim duab ntawm schematic tau txuas nrog. Txoj hauv kev ua haujlwm yog tias thaum 5V tau thov, C1 yog ib ntus luv luv thiab tam sim no ntws dawb los ntawm C1 thiab R3 rau hauv paus Q1. Q1 tau qhib thiab ib ntus tso qhov luv luv hla R1. Yog li qhov tseem ceeb peb muaj 5V thov rau K1 kauj raws li tus pin 1 ntawm kev xa tawm yuav nyob rau hauv yuav luag txhua qhov peev txheej vim Q1 tau ua tiav ib ntus.
Hauv qhov no, lub relay ua haujlwm. Tom ntej C1 tawm los ntawm R2 thiab yuav yog li 63% tso tawm tom qab 0.1 vib nas this vim 100uF x 1000 ohms muab 0.1 thib ob tau lossis RC lub sijhawm tas li. (Koj kuj tseem tuaj yeem siv lub zog me me thiab tus nqi tiv thaiv loj dua kom tau txais txiaj ntsig zoo ib yam xws li 10uF x 10K ohms). Qee lub sijhawm nyob ib puag ncig 0.1 vib nas this tom qab lub tshuab hluav taws xob tau qhib, Q1 yuav tua thiab tam sim no yuav ntws los ntawm cov xa hluav taws xob thiab dhau R1 mus rau hauv av.
Los ntawm peb qhov kev coj ua tus yam ntxwv peb paub tias peb xav kom tuav tam sim no los ntawm lub kauj kom nyob ib puag ncig 9 txog 10 ma thiab qhov hluav taws xob hla lub kauj kom txog 1.2V. Los ntawm qhov no peb tuaj yeem txiav txim siab tus nqi R1. Nrog 1.2V hla cov kauj nws qhov cuam tshuam yog li 128 ohms raws li tau txiav txim siab thaum lub sijhawm ua tus yam ntxwv. Yog li:
Rcoil = 128 ohmsRtotal = 5V/9.5ma = 526 ohms
Rtotal = R1 + RcoilR1 = Rtotal - Rcoil
R1 = 526 - 128 = 398 ohmsWe xav tau siv tus qauv txheej txheem ze tshaj ntawm 390 ohms.
Kauj Ruam 3: Tsim Breadboard
Lub Circuit Court ua haujlwm tau zoo nrog 0.1 sec lub sijhawm tas li rau C1 thiab R2. Kev xa tawm ua haujlwm thiab tshem tawm tam sim ntawd raws li 5V tau thov thiab tshem tawm thiab kaw rau thaum 5V tau thov. Nrog tus nqi ntawm 390 ohms rau R1 tuav tam sim no los ntawm kev xa tawm yog kwv yees li 9.5 ma uas tsis zoo li qhov ntsuas ntsuas tam sim no ntawm 36.6 ma nrog tag nrho 5V thov rau kev xa tawm. Kev txuag hluav taws xob yog kwv yees li 75% thaum siv cov tuav tam sim no txhawm rau ua kom txuas mus.
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