Idizayini Eyisisekelo ye-DC Electronic Loads

Ochungechungeni lwesekethe yeI-DC electronic load, yamanje endaweni ngayinye iyafana, futhi isifunda sidinga ukusebenza ngokuqhubekayo.Uma nje i-current egeleza engxenyeni eyodwa ilawulwa kusekethe yochungechunge, ukuphuma okungaguquki kwamanje esikulawulayo kungafinyelelwa.

Isekhethi yamanje elula, evame ukusetshenziswa ezinhlelweni ezinamandla aphansi kanye nezidingo eziphansi.Kwezinye izinhlelo zokusebenza, le sekethi ayinawo amandla, njengokuthi: lapho i-voltage yokufaka ingu-1V futhi okokufaka kwamanje kungu-30A,

Le mfuneko ayikwazi ukuqinisekisa umsebenzi nhlobo, futhi akulula kakhulu ukuthi isifunda silungise ukukhishwa kwamanje.

Enye yamasekhethi amanje asetshenziswa njalo, isekethe enjalo kulula ukuthola amanani amanje azinzile futhi anembile, i-R3 iyisixazululi sesampula, kanti i-VREF iyisiginali enikeziwe.

Umgomo wokusebenza wesekethe, unikezwe isignali ye-VREF: Lapho i-voltage ku-R3 ingaphansi kwe-VREF, okungukuthi, i--IN ye-OP07 ingaphansi kuka-+IN, ukuphuma kwe-OP07 kuyanda, ukuze i-MOS inyuke. kanti imali engu-R3 iyanda;

Lapho i-voltage ku-R3 inkulu kune-VREF, -IN inkulu kune-+IN, futhi i-OP07 inciphisa okukhiphayo, okubuye kunciphise okwamanje ku-R3, ukuze isekethe ekugcineni igcinwe ngenani elinikeziwe elihlala njalo, eliqaphela futhi ukusebenza okungaguquki. ukusebenza;

Lapho i-VREF enikeziwe ingu-10mV kanye no-R3 ingu-0.01 ohm, amandla angashintshi esekethe angu-1A, inani lamanje elingaguquki lingashintshwa ngokushintsha i-VREF, i-VREF ingalungiswa nge-potentiometer noma i-chip ye-DAC ingasetshenziswa ukulawula. okokufaka kwe-MCU,

Ukukhishwa kwamanje kungalungiswa ngesandla ngokusebenzisa i-potentiometer.Uma okokufaka kwe-DAC kusetshenziswa, umthwalo we-elekthronikhi ongashintshi olawulwa ngedijithali ungenziwa.Isakhiwo esilungisiwe

Setha ububanzi obugxilile nobude kubha yamathuluzi.Ingemuva lingasethwa ukuze lifakwe.Ingakwazi ukuqondisa kahle isithombe sangemuva nombhalo futhi wenze isifanekiso sakho.

Ukuqinisekiswa kokulingisa kwesifunda:

I-voltage eqhubekayo

Isekhethi ye-voltage engaguquki, vele usebenzise i-Zener diode.

I-voltage yokufaka ilinganiselwe ku-10V, futhi isifunda se-voltage esingaguquki siwusizo kakhulu uma sisetshenziselwa ukuhlola ishaja.Singalungisa kancane kancane i-voltage ukuze sihlole izimpendulo ezihlukahlukene zeshaja.

I-voltage kushubhu ye-MOS ihlukaniswa ngo-R3 no-R2 futhi ithunyelwa ku-amplifier yokusebenza IN+ ukuze iqhathaniswe nevelu enikeziwe.Njengoba kuboniswe emfanekisweni, lapho i-potentiometer iku-10%, IN- ingu-1V, khona-ke i-voltage ku-tube ye-MOS kufanele ibe ngu-2V.

Umjikelezo wokumelana njalo

Ngomsebenzi wokumelana njalo, kokunye kulawulwa ngamananiimithwalo kagesi, akukho umjikelezo okhethekile oklanyelwe, kodwa okwamanje ibalwa nge-voltage yokufaka etholwe yi-MCU ngesisekelo sesifunda samanje esiqhubekayo, ukuze kuzuzwe injongo yomsebenzi wokumelana njalo.

Isibonelo, lapho ukumelana okungapheli kungu-10 ohms, futhi i-MCU ithola ukuthi i-voltage yokufaka ingu-20V, izolawula ukuphuma kwamanje ukuze kube ngu-2A.

Nokho, le ndlela inokusabela okunensayo futhi ifaneleka kuphela izikhathi lapho okokufaka kushintsha khona kancane futhi izidingo zingekho phezulu.Professional ukumelana njaloimithwalo kagesizenziwa nge-hardware.

Umjikelezo wamandla njalo

Ukusebenza kwamandla njalo Iningiimithwalo kagesizenziwa yisekethe yamanje engashintshi.Isimiso siwukuthi i-MCU ibala okukhiphayo kwamanje ngokwenani lamandla amisiwe ngemva kokusampula i-voltage yokufaka.