Txhawm rau nkag siab cov nuances ntawm kev tiv thaiv sab hauv thiab impedance, nws yog ib qho tseem ceeb kom paub tias impedance cuam tshuam rau AC (alternating tam sim no), thaum lub zog sab hauv muaj feem cuam tshuam nrog DC (direct tam sim no). Txawm hais tias lawv cov ntsiab lus sib txawv, lawv cov kev suav ua raws li cov qauv qub, R = V / I, qhov twg R yog sab hauv lossis impedance, V yog voltage, thiab kuv yog tam sim no.
Internal Resistance: Lub Barrier rau Electron Flow
Internal kuj tshwm sim los ntawm kev sib tsoo ntawm electrons nrog tus neeg xyuas pib lub ionic lattice, hloov hluav taws xob hluav taws xob mus rau hauv tshav kub. Xav txog kev tiv thaiv sab hauv raws li hom kev sib txhuam impeding electron txav. Nyob rau hauv cov xwm txheej uas alternating tam sim no ntws los ntawm ib tug resistive caij, nws generates ib tug voltage poob. Qhov kev poob no tseem nyob rau theem nrog rau tam sim no, qhia txog kev sib raug zoo ntawm cov dej ntws tam sim no thiab cov kev tawm tsam sab hauv.
Impedance: Lub tswv yim dav dav uas suav nrog Internal Resistance
Impedance sawv cev rau lub ntsiab lus dav dav uas encapsulates txhua hom kev tawm tsam rau electron ntws. Qhov no suav nrog tsis yog tsuas yog kev tiv thaiv sab hauv, tab sis kuj reactance. Nws yog ib lub tswv yim ubiquitous pom nyob rau hauv tag nrho cov circuits thiab Cheebtsam.
Nws yog ib qho tseem ceeb kom paub qhov txawv ntawm reactance thiab impedance. Reactance tshwj xeeb yog hais txog qhov kev tawm tsam muab rau AC tam sim no los ntawm inductors thiab capacitors, cov ntsiab lus sib txawv ntawm ntau hom roj teeb. Qhov kev hloov pauv no yog pom tseeb hauv daim duab sib txawv thiab cov txiaj ntsig hluav taws xob tus yam ntxwv ntawm txhua hom roj teeb.
Txhawm rau demystify impedance, peb tuaj yeem tig mus rau Randles qauv. Cov qauv no, piav qhia hauv daim duab 1, sib koom ua ke R1, R2, nrog rau C. Tshwj xeeb, R1 sawv cev rau kev tiv thaiv sab hauv, thaum R2 sib raug rau cov nqi hloov pauv. Tsis tas li ntawd, C qhia txog ob txheej txheej capacitor. Qhov tshwj xeeb tshaj yog, tus qauv Randles feem ntau tsis suav nrog inductive reactance, vim tias nws cuam tshuam rau kev ua haujlwm ntawm roj teeb, tshwj xeeb tshaj yog nyob rau qis zaus, tsawg heev.
Daim duab 1: Randles qauv ntawm cov roj teeb kua qaub
Kev sib piv ntawm Internal Resistance thiab Impedance
Txhawm rau kom paub meej, cov ncauj lus kom ntxaws sib piv ntawm kev tiv thaiv sab hauv thiab impedance tau teev tseg hauv qab no.
Aspect of Electrical Property |
Internal Resistance (R) |
Impedance (Z) |
Daim ntawv thov Circuit Court |
Siv feem ntau hauv circuits ua haujlwm ntawm direct tam sim no (DC). |
Feem ntau ua hauj lwm hauv circuits tsim rau alternating tam sim no (AC). |
Circuit Court muaj |
Observable nyob rau hauv ob qho tib si alternating tam sim no (AC) thiab ncaj tam sim no (DC) circuits. |
Tshwj xeeb rau alternating tam sim no (AC) circuits, tsis muaj nyob rau hauv DC. |
Keeb kwm |
Originates los ntawm cov khoom uas cuam tshuam qhov ntws ntawm hluav taws xob tam sim no. |
Qhov tshwm sim los ntawm kev sib xyaw ua ke ntawm cov ntsiab lus uas tiv taus thiab ua rau cov hluav taws xob tam sim no. |
Tus lej nthuav qhia |
Qhia siv tus lej tiag tiag, piv txwv li, 5.3 ohms. |
Qhia tawm los ntawm ob tus lej tiag tiag thiab cov kev xav hauv kev xav, ua piv txwv los ntawm 'R + ik'. |
Zaus Dependence |
Nws tus nqi tseem nyob tas li tsis hais qhov zaus ntawm DC tam sim no. |
Nws tus nqi hloov pauv nrog qhov hloov pauv ntawm AC tam sim no. |
Cov yam ntxwv theem |
Tsis pom muaj lub kaum sab xis lossis qhov loj me. |
Characterized los ntawm ob qho tag nrho cov theem kaum sab xis thiab qhov loj. |
Cwj pwm hauv Electromagnetic Field |
Tsuas yog ua pov thawj lub zog dissipation thaum raug rau ib qho chaw electromagnetic. |
Ua kom pom ob lub zog dissipation thiab lub peev xwm khaws cia lub zog hauv electromagnetic teb. |
Precision nyob rau hauv Battery Internal Resistance Measurement
Raws li tus kws kho mob tshwj xeeb hauv kev saib xyuas thiab tswj cov roj teeb thaub qab, DFUN qhov tseem ceeb ntawm kev ntsuas roj teeb hauv lub cev ua haujlwm nrog kev tsim kev lag luam, kos kev tshoov siab los ntawm cov khoom siv dav dav xws li Fluke lossis Hioki. Kev siv cov txheej txheem zoo ib yam li cov cuab yeej no, paub txog lawv qhov tseeb thiab kev lees paub thoob plaws cov neeg siv khoom, peb ua raws li cov qauv xws li IEE1491-2012 thiab IEE1188.
IEE1491-2012 qhia peb txog kev nkag siab txog kev tiv thaiv sab hauv raws li qhov ntsuas tsis muaj zog, xav tau kev taug qab mus tas li kom ntsuas qhov sib txawv ntawm lub hauv paus. Lub caij no, tus qauv IEE1188 tau teeb tsa qhov pib rau kev nqis tes ua, qhia tias yog tias qhov kev tiv thaiv sab hauv siab tshaj 20% ntawm tus qauv kab, lub roj teeb yuav tsum raug txiav txim siab rau kev hloov lossis raug rau lub voj voog sib sib zog nqus thiab rov ua dua.
Tsiv los ntawm cov ntsiab cai no, peb txoj kev ntsuas kev tiv thaiv sab hauv suav nrog kev tso lub roj teeb mus rau qhov chaw ruaj khov thiab tam sim no, ua raws li qhov ntsuas hluav taws xob. Kev ua haujlwm tom qab, suav nrog kev kho kom raug thiab lim los ntawm kev ua haujlwm amplifier Circuit Court, yields qhov ntsuas qhov tseeb ntawm kev tiv thaiv sab hauv. Kev nrawm nrawm, txoj kev no feem ntau xaus li ntawm 100 milliseconds, khav theeb qhov tseeb ntawm 1% txog 2%.
Nyob rau hauv xaus, precision nyob rau hauv lub internal kuj ntsuas xyuas kom meej kev soj ntsuam ntawm cov roj teeb, ua rau lawv lub neej ntev. Cov lus qhia no yog txhawm rau pab cov neeg uas tuaj yeem pom tias nws nyuaj rau kev sib txawv ntawm kev tiv thaiv sab hauv thiab impedance, ua kom muaj kev nkag siab zoo ntawm cov khoom hluav taws xob no. Yog xav paub ntau ntxiv thiab nkag siab, koj tuaj yeem tshawb nrhiav cov peev txheej ntxiv los ntawm DFUN Tech.
