DigitalOscilloscopeKev ntsuas ntawmHloov cov khoom siv hluav taws xob
Cov khoom siv hluav taws xob tuaj yeem muaj ntau hom thiab ntau thiab tsawg, los ntawm cov khoom siv hluav taws xob analogue-hom hluav taws xob mus rau cov khoom siv hluav taws xob hloov tau zoo heev. Lawv txhua tus ntsib complex, dynamic kev khiav hauj lwm ib puag ncig. Cov khoom siv thauj khoom thiab cov kev xav tau tuaj yeem hloov pauv sai sai. Txawm tias "hnub-rau-hnub" hloov cov khoom siv hluav taws xob yuav tsum muaj peev xwm tiv taus qhov siab tshaj plaws ntawm lawv qhov nruab nrab ntawm kev ua haujlwm. Engineers tsim cov khoom siv hluav taws xob lossis cov tshuab uas yuavsiv cov khoom siv hluav taws xobyuav tsum nkag siab tias cov khoom siv hluav taws xob yuav ua li cas nyob rau hauv cov xwm txheej zoo li qub nrog rau cov xwm txheej phem tshaj plaws.
Yav dhau los, characterizing tus cwj pwm ntawm lub hwj chim mov txhais tau tias ntsuas quiescent tam sim no thiab voltages nrog ib tug digital.multimeterthiab ua cov lej suav nrog lub laij lej lossis PC. Niaj hnub no, feem ntau engineers tig mus rau oscilloscopes raws li lawv nyiam lub zog ntsuas platform. Niaj hnub nimno oscilloscopes tuaj yeem nruab nrog kev ntsuas hluav taws xob sib xyaw thiab kev tshuaj ntsuam xyuas software, ua kom yooj yim teeb tsa thiab ua kom ntsuas qhov ntsuas tau yooj yim dua. Cov neeg siv tuaj yeem hloov kho qhov tseem ceeb, suav cov lej thiab pom cov txiaj ntsig hauv vib nas this, tsis yog cov ntaub ntawv nyoos xwb.
Cov teeb meem tsim khoom siv hluav taws xob thiab lawv qhov kev ntsuas xav tau
Qhov zoo tshaj plaws, txhua lub zog hluav taws xob yuav tsum ua haujlwm zoo li tus qauv lej uas nws tau tsim. Tab sis nyob rau hauv lub ntiaj teb tiag tiag,cov khoommuaj qhov tsis zoo, kev hloov pauv hloov, cov khoom siv hluav taws xob tuaj yeem cuam tshuam, thiab kev hloov pauv ib puag ncig tuaj yeem hloov pauv kev ua haujlwm. Tsis tas li ntawd, kev hloov pauv kev ua tau zoo thiab cov nqi xav tau nyuaj rau kev tsim hluav taws xob tsim khoom. Xav txog cov teeb meem no:
Muaj pes tsawg watts tuaj yeem ua kom muaj zog tshaj nws cov nqi zog? Nws kav ntev npaum li cas? Lub zog hluav taws xob tawm hluav taws xob ntau npaum li cas? Yuav ua li cas thaum nws overheats? Nws xav tau cua txias npaum li cas? Yuav ua li cas thaum lub load tam sim no nce ntau? Lub tsev puas tuaj yeem tswj hwm nws qhov ntsuas qhov ntsuas hluav taws xob? Yuav ua li cas lub hwj huam mov yuav tiv nrog ib tug ua tiav luv luv Circuit Court ntawm cov zis? Yuav ua li cas tshwm sim thaum lub input voltage rau lub hwj chim mov hloov?
Cov neeg tsim qauv yuav tsum tsim cov khoom siv hluav taws xob uas siv qhov chaw tsawg dua, txo cov cua sov, txiav cov nqi tsim khoom, thiab ua tau raws li EMI / EMC cov qauv nruj dua. Tsuas yog ib qho kev ntsuas nruj yuav tso cai rau cov engineers ua tiav cov hom phiaj no.
Oscilloscopes thiab Kev Ntsuas Lub Zog
Rau cov neeg siv cov kev ntsuas siab-bandwidth nrog oscilloscopes, kev ntsuas hluav taws xob yuav yooj yim vim lawv qhov tsawg zaus. Hauv kev muaj tiag, muaj ntau qhov kev sib tw hauv kev ntsuas hluav taws xob uas cov neeg tsim hluav taws xob high-speed circuit tsis tau ntsib.
Qhov hluav taws xob hla lub tshuab hloov pauv tuaj yeem siab thiab "floating", piv txwv li, tsis yoghauv av. Lub pulse dav, lub sij hawm, zaus thiab lub luag hauj lwm voj voog ntawm lub teeb liab yuav txawv. Waveforms yuav tsum raug ntes thiab tshuaj xyuas kom pom qhov tsis txaus ntseeg. Qhov no yog qhov xav tau ntawm oscilloscopes. Ntau qhov kev sojntsuam - Kev sojntsuam ib zaug, kev sojntsuam sib txawv, thiab kev sojntsuam tam sim no kuj xav tau.Qhov ntsuasyuav tsum muaj lub cim xeeb loj los muab chav rau sau cov txiaj ntsig los ntawm qhov ntev, tsawg zaus tau txais. Thiab nws yuav tsum tau ntes cov cim sib txawv nrog qhov sib txawv ntawm qhov sib txawv hauv ib qho kev tau txais.
Switching Power Supply Fundamentals
Qhov tseem ceeb ntawm DC lub zog hluav taws xob hauv cov tshuab niaj hnub no feem ntau yog qhov hloov hluav taws xob hloov hluav taws xob (switched-hom fais fab mov), uas paub zoo txog nws lub peev xwm los daws cov khoom sib txawv. Lub zog hluav taws xob teeb liab txoj hauv kev ntawm kev hloov pauv hluav taws xob muaj xws li cov khoom siv tsis muaj zog, cov khoom siv nquag, thiab cov khoom sib nqus. Hloov cov khoom siv hluav taws xob siv tsawg tsawg li tsawg tau (piv txwv li,resistorsthiab linear transistors) thiab feem ntau siv (zoo tagnrho) cov khoom tsis zoo: hloov cov transistors,capacitors, thiab cov khoom sib nqus.
Cov khoom siv hluav taws xob hloov pauv kuj tseem muaj ntu tswj hwm, uas suav nrog cov khoom siv xws li pulse-width modulation regulator pulse-frequency modulation regulator, thiab lub tswv yim voj 1. Cov seem tswj yuav muaj nws tus kheej lub hwj chim mov. FIG. 1 yog ib qho yooj yim schematic ntawm ib tug switching fais fab mov uas qhia cov hluav taws xob hloov hluav taws xob seem, uas muaj xws li active thiab passive Cheebtsam raws li zoo raws li cov hlau nplaum Cheebtsam.
Kev siv hluav taws xob hloov hluav taws xob siv hluav taws xob semiconductor hloov khoom siv xws li hlau oxide teb cov nyhuv transistors (MOSFETs) nrog cov rooj vag hluav taws xob hluav taws xob (IGBTs). Cov khoom siv no muaj lub sijhawm hloov luv luv thiab tuaj yeem tiv taus qhov hluav taws xob tsis ruaj khov. Qhov tseem ceeb sib npaug, lawv siv lub zog tsawg heev nyob rau hauv lossis tawm hauv lub xeev, uas ua rau muaj kev ua haujlwm siab thiab tsim hluav taws xob tsawg. Hloov cov khoom siv feem ntau txiav txim siab tag nrho kev ua haujlwm ntawm lub zog hloov hluav taws xob. Cov kev ntsuas tseem ceeb ntawm cov khoom siv hloov pauv muaj xws li: hloov pauv qhov poob, qhov nruab nrab lub zog poob,nyab xeebthaj chaw ua haujlwm thiab lwm yam.
