CAN Bus yog dab tsi
CAN tsheb npav yog ib qho kev sib txuas lus raws tu qauv dav siv hauv tsheb, kev lag luam automation, thiab lwm yam. Nws ua rau ntau yam khoom siv los qhia cov kab sib txuas lus rau kev xa cov ntaub ntawv thiab tswj cov teeb liab. Muaj ob qhov sib txawv ntawm CAN tsheb npav: CAN 2.0A thiab CAN 2.0B. CAN 2.0A txhawb nqa 11-ntsis tus qauv qhia, thaum CAN 2.0B txhawb 29-ntsis txuas ntxiv cov cim. CAN tsheb npav topologies suav nrog tsheb npav, hnub qub, thiab kev teeb tsa hybrid. Lub tsheb npav topology feem ntau yog, txuas tag nrho cov node pab kiag li lawm thiab yuav tsum tau terminating resistors ntawm ob kawg ntawm lub tsheb npav.
Vim li cas Surge Protection thiaj li tsim nyog
CAN lub tsheb npav tuaj yeem raug cuam tshuam los ntawm electromagnetic cuam tshuam (EMI) thiab hluav taws xob cuam tshuam (EMI), uas tuaj yeem ua rau kis tsis raug thiab kho vajtse tsis ua haujlwm. Kev tiv thaiv Surge qhia txog kev tiv thaiv kev tiv thaiv rau hauv lub tsheb npav CAN los tiv thaiv cov kev cuam tshuam no. Kev tiv thaiv hluav taws xob hluav taws xob ntawm lub npav CAN tuaj yeem tiv thaiv lub tsheb npav los ntawm kev nqus, kev xav, lossis kev tawm tsam.
Tam sim no automotive electronics qauv nrog EMC xeem feem ntau poob rau hauv ob pawg:
1: Kev sim ua ntu zus rau lub tshuab hluav taws xob
2: Electrostatic Discharge (ESD) thiab Surge Test rau Kev Sib Txuas Lus
Kev ntsuas fais fab muaj xws li: Pulse 1(a) simulates cov xwm txheej tsis tu ncua tshwm sim los ntawm inductive loads thaum fais fab tuag sai; Pulse 2(a) simulates ib ntus ntawm inductive loads nyob rau hauv cov hlua khi vim tam sim no cuam tshuam; Pulse 2(b) simulates transients los ntawm kiv cua lossis wiper motors thaum lub zog khiav haujlwm raug tshem tawm; Pulse 3(a)(b) simulates ib ntus pulses generated thaum hloov cov txheej txheem. Pulse 5 simulates lub load pob tseg tsis tu ncua waveform thaum lub roj teeb poob.
Qhov tseem ceeb ntawm Surge Protection Design rau CAN Bus
Kev ua tsis tiav hauv lub npav CAN tuaj yeem ua rau muaj qhov tshwm sim loj heev, suav nrog cov khoom siv puas tsuaj, teeb meem kev nyab xeeb, thiab cov ntaub ntawv poob. Yog li ntawd, kev ruaj ntseg surge tiv thaiv tsim yog ib qho tseem ceeb rau kev ua kom muaj kev ntseeg siab thiab ruaj khov. Tsis tas li ntawd, xav txog qhov chaw ua haujlwm ntawm CAN tsheb npav, kev tiv thaiv kev kub ntxhov yuav tsum muaj kev cuam tshuam kev cuam tshuam, siab - kub siab, kev co kuj, thiab kev ntseeg siab.
Nyob rau hauv ib puag ncig hauv tsheb, qhov chaw uas tib neeg sib cuag tau tshwm sim, cov xwm txheej electrostatic tawm (ESD), hluav taws xob overstress (EOS), thiab hluav taws xob ceev ceev (EFT) cov xwm txheej muaj tshwm sim thaum lub tsheb ua haujlwm. Cov no ua rau muaj kev hem thawj rau kev txav tsheb. Thaum CAN transceiver chips suav nrog qee qhov kev tiv thaiv ESD hauv lawv cov qauv tsim, lawv qib qis qis ntawm qhov system- qib kev xeem yuav tsum tau ua. Yog li ntawd, kev tiv thaiv tsim rau CAN kev sib txuas lus interfaces dhau los ua qhov tseem ceeb.
Txoj Kev CAN Bus Surge Protection Design
Kev tiv thaiv kev tiv thaiv tsheb npav tuaj yeem koom nrog cov khoom siv xws li resistors, capacitors, TVS diodes, thiab transient voltage suppressors (TVS). Ntawm cov no, TVS diodes feem ntau siv cov ntsiab lus tiv thaiv, muab cov txiaj ntsig zoo xws li cov lus teb ceev ceev, tsis tshua muaj hluav taws xob tam sim no, thiab siab zog nqus. Hauv kev siv tswv yim, xaiv cov txheej txheem tiv thaiv kev tiv thaiv thiab cov khoom tsim nyog yuav tsum xav txog cov xwm txheej tshwj xeeb thiab cov cai.
Kev siv CAN Bus Surge Protection Circuits
CAN lub tsheb npav tiv thaiv kev tiv thaiv hluav taws xob tuaj yeem siv tau los ntawm kev siv cov khoom sib cais lossis cov sib txuas sib txuas. Discrete Cheebtsam Circuit Court muaj ntau yam kev ywj pheej, muab kev kho kom haum xeeb thiab yooj yim ntawm kev saib xyuas thiab hloov kho dua tshiab. Integrated circuits, conversely, integrate ntau yam khoom mus rau ib tug nti, muab qhov zoo xws li compact loj, tsawg zog noj, thiab tus nqi -effectiveness. Hauv kev siv cov tswv yim, txoj kev siv hluav taws xob tsim nyog yuav tsum raug xaiv raws li qhov tshwj xeeb ntawm daim ntawv thov scenario thiab cov cai.
Piv txwv ntawm CAN Bus Surge Protection Design
Kab lus no nthuav tawm ntau yam piv txwv ntawm CAN tsheb npav surge tiv thaiv circuits los pab cov neeg nyeem kom nkag siab zoo dua cov ntsiab lus. Piv txwv li, los daws cov teeb meem hluav taws xob cuam tshuam hauv lub tsheb npav CAN, kev tiv thaiv kev tiv thaiv tuaj yeem ua tiav siv cov kab hluav taws xob capacitive lossis RC lim circuits. Hloov pauv, rau cov teeb meem cuam tshuam hauv hluav taws xob, cov khoom xws li TVS diodes thiab cov hluav taws xob hloov hluav taws xob tuaj yeem ua haujlwm rau kev tiv thaiv surge.
Cov lus pom zoo ntawm ESD Device Placement
a) Muab cov cuab yeej ze ze li sai tau rau cov khoom siv nkag lossis cov khoom sib txuas.
b) Txo txoj kev ntev ntawm cov khoom siv thiab cov kab tiv thaiv.
c) Khaws cov kab hluav taws xob sib txuas mus rau qhov tsawg kawg nkaus.
d) Tsis txhob khiav cov conductors tiv thaiv thaum uas tig mus rau cov tsis muaj kev tiv thaiv conductors.
e) Txo tag nrho cov voj voog hluav taws xob ntawm cov ntawv luam tawm Circuit Board (PCBs), suav nrog lub zog thiab cov voj hauv av.
f) Txo qhov ntev ntawm txoj kev rov qab mus rau hauv av.
g) Tsis txhob siv cov kev sib koom ua ke rov qab mus rau cov ntsiab lus hauv av.
h) Siv dav hlau hauv av, ntau- txheej PCBs, thiab hauv av vias thaum twg los tau.
Cov ntsiab lus
Kab lus no piav qhia txog qhov tseem ceeb, cov qauv tsim, thiab cov kev siv rau CAN kev tiv thaiv kev tiv thaiv tsheb npav. Nws cia siab tias cov ntaub ntawv no yuav pab cov neeg nyeem nkag siab zoo dua CAN tsheb npav tiv thaiv kev tiv thaiv thiab txhim kho kev ntseeg siab thiab kev ruaj ntseg hauv kev siv tswv yim. Nws yuav tsum tau muab sau tseg tias thaum tsim CAN tsheb npav surge tiv thaiv, lub system kev khiav hauj lwm ib puag ncig thiab daim ntawv thov scenarios yuav tsum tau txiav txim siab tag nrho, thiab tsim nyog surge tiv thaiv txoj kev thiab cov khoom yuav tsum tau xaiv.