Siv cov oscilloscope digital los ntsuas cov kauj ruam hloov hluav taws xob
Rau cov neeg siv los ua cov kev ntsuas siab bandwidth nrog oscilloscopes, kev ntsuas hluav taws xob yuav zoo li yooj yim vim lawv qhov zaus tsawg. 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 tsawgcov khoomraws li qhov ua tau (eg,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.
