Uyilo olusisiseko lwe-DC Electronic Loads

Kwisekethe yochungechunge lweUmthwalo we-elektroniki we-DC, okwangoku kwinqanaba ngalinye liyafana, kwaye isiphaluka kufuneka sisebenze ngokuqhubekayo.Ngethuba nje i-current flowing through one component ilawulwa kwisekethe yochungechunge, imveliso eqhubekayo yangoku esiyilawulayo inokufezekiswa.

Isiphaluka esilula esihlala sikhona, ngokuqhelekileyo sisetyenziswa kwizicelo ezinamandla aphantsi kunye neemfuno eziphantsi.Kwezinye izicelo, le sekethi ayinamandla, njengale: xa igalelo lombane liyi-1V kwaye igalelo langoku liyi-30A,

Le mfuneko ayikwazi ukuqinisekisa umsebenzi konke konke, kwaye ayilungelekanga kakhulu ukuba isiphaluka silungelelanise imveliso yangoku.

Enye yeesekethe eziqhelekileyo ezisetyenziswa ngokuqhelekileyo zangoku, isiphaluka esinjalo kulula ukufumana amaxabiso akhoyo azinzileyo kwaye achanekileyo, i-R3 yi-resistor yesampuli, kunye ne-VREF isignali enikiweyo.

Umgaqo wokusebenza wesekethe, unikwe umqondiso weVREF: Xa i-voltage kwi-R3 ingaphantsi kwe-VREF, oko kukuthi, i--IN ye-OP07 ingaphantsi kwe-+IN, imveliso ye-OP07 yanda, ukwenzela ukuba i-MOS inyuke. kwaye imali ekhoyo ye-R3 yandisiwe;

Xa i-voltage kwi-R3 inkulu kune-VREF, -IN inkulu kune-+IN, kwaye i-OP07 iyanciphisa imveliso, enciphisa i-current kwi-R3, ukuze isekethe igcinwe ekugqibeleni kwixabiso elinikeziweyo, eliqaphelayo ngokuqhubekayo. ukusebenza;

Xa i-VREF enikeziweyo i-10mV kunye ne-R3 yi-0.01 ohm, i-current current ye-circuit yi-1A, ixabiso langoku eliqhubekayo lingatshintshwa ngokutshintsha i-VREF, i-VREF inokulungiswa nge-potentiometer okanye i-chip ye-DAC ingasetyenziselwa ukulawula. igalelo le-MCU,

Imveliso yangoku inokulungiswa ngesandla ngokusebenzisa i-potentiometer.Ukuba igalelo leDAC liyasetyenziswa, umthwalo okhoyo we-elektroniki olawulwa ngokwedijithali ungafezekiswa.Uyilo oluzinzileyo

Seta ububanzi obusisigxina kunye nobude kwibar yesixhobo.Imvelaphi inokusetwa ukuba ibandakanywe.Iyakwazi ukulungelelanisa ngokugqibeleleyo umfanekiso ongasemva kunye nesicatshulwa kwaye wenze itemplate yakho.

Ukuqinisekiswa kokulinganisa kwesekethe:

Umjikelo wamandla ombane rhoqo

Isekethe ye-voltage elula rhoqo, sebenzisa nje i-Zener diode.

I-voltage input ilinganiselwe kwi-10V, kwaye i-voltage circuit circuit iluncedo kakhulu xa isetyenziselwa ukuvavanya ishaja.Sinokuyilungisa kancinane amandla ombane ukuvavanya iimpendulo ezahlukeneyo zetshaja.

I-voltage kwi-tube ye-MOS ihlukaniswe yi-R3 kunye ne-R2 kwaye ithunyelwe kwi-amplifier yokusebenza IN + ukuze kuthelekiswe nexabiso elinikeziweyo.Njengoko kuboniswe kumfanekiso, xa i-potentiometer i-10%, IN- yi-1V, ngoko i-voltage kwi-tube ye-MOS kufuneka ibe yi-2V.

Isekethe yokumelana rhoqo

Kumsebenzi wokuxhathisa rhoqo, kwezinye zilawulwa ngamananiimithwalo ye-elektroniki, akukho mjikelezo okhethekileyo owenziweyo, kodwa i-current ibalwa yi-voltage yegalelo efunyenwe yi-MCU ngesiseko somjikelezo oqhubekayo wangoku, ukuze ufezekise injongo yomsebenzi wokumelana rhoqo.

Ngokomzekelo, xa ukuxhatshazwa rhoqo ku-10 ohms, kwaye i-MCU ibona ukuba i-voltage yegalelo yi-20V, iya kulawula imveliso yangoku ibe yi-2A.

Nangona kunjalo, le ndlela inempendulo ecothayo kwaye ifanelekile kuphela kwizihlandlo apho igalelo litshintsha ngokucothayo kwaye iimfuno zingekho phezulu.Uxhathiso oluqhubekayo lobuchwepheshaimithwalo ye-elektronikizenziwa ngehardware.

Umjikelo wamandla rhoqo

Umsebenzi wamandla rhoqo Uninziimithwalo ye-elektronikiziphunyezwa yisekethe yangoku rhoqo.Umgaqo-siseko kukuba i-MCU ibala imveliso yangoku ngokuhambelana nexabiso lamandla amisiweyo emva kokuthatha isampuli yegalelo lombane.