Muchikamu chedunhu reDC electronic load, ikozvino panzvimbo imwe neimwe yakafanana, uye dunhu rinoda kushanda nekusingaperi ikozvino.Chero bedzi iyo ikozvino inoyerera kuburikidza nechimwe chikamu ichidzorwa mumutsara wedunhu, iyo inogara iripo inobuda yatinodzora inogona kuwanikwa.
Iyo iri nyore inogara iripo yedunhu, inowanzo shandiswa mumashandisirwo ane yakaderera simba uye yakaderera zvinodiwa.Mune mamwe maapplication, dunhu iri harina simba, senge: kana magetsi ekuisa ari 1V uye yekupinda ikozvino iri 30A,
Ichi chinodiwa hachigone kuvimbisa basa zvachose, uye hazvisi nyore kuti dunhu rigadzirise kubuda kwezvino.
Imwe yeanowanzo shandiswa anogara aripo masekete, dunhu rakadaro riri nyore kuwana yakagadzikana uye yakaringana kukosha kwazvino, R3 is sampling resistor, uye VREF chiratidzo chakapihwa.
Nheyo yekushanda yedunhu ndeye, yakapihwa chiratidzo VREF: Kana iyo voltage paR3 iri pasi peVREF, kureva, iyo -IN yeOP07 iri pasi pe +IN, kubuda kweOP07 kunowedzerwa, kuitira kuti MOS iwedzere. uye ikozvino yeR3 inowedzerwa;
Kana voltage paR3 yakakura kudarika VREF, -IN yakakura kudarika + IN, uye OP07 inoderedza kubuda, iyo inoderedzawo ikozvino paR3, kuitira kuti dunhu rinopedzisira rachengetedzwa pane imwe nguva yakapiwa kukosha, iyo inoonawo nguva dzose. operation;
Kana iyo VREF yakapihwa iri 10mV uye R3 iri 0.01 ohm, iyo inogara iripo yedunhu iri 1A, iyo inogara iripo kukosha inogona kuchinjwa nekushandura VREF, iyo VREF inogona kugadziriswa ne potentiometer kana iyo DAC chip inogona kushandiswa kudzora. zvakaiswa neMCU,
Ikozvino inobuda inogona kugadziriswa nemaoko nekushandisa potentiometer.Kana iyo DAC yekupinza ikashandiswa, inodzorwa nedhijitari inogara iripo yemagetsi mutoro inogona kuitika.Fixed layout
Gadzirisa hupamhi uye hurefu hwakagadziriswa pane toolbar.Iyo yekumashure inogona kuiswa kuti ibatanidzwe.Inogona kunyatso kurongedza mufananidzo wekumashure uye zvinyorwa uye kugadzira yako template.
Circuit simulation verification:
Constant voltage circuit
Iyo yakapusa inogara voltage wedunhu, ingo shandisa Zener diode.
Iyo yekupinza voltage inogumira ku10V, uye iyo inogara ichitenderedza voltage yedunhu inobatsira zvakanyanya kana ichishandiswa kuyedza charger.Tinogona kugadzirisa zvishoma nezvishoma voltage kuti tiedze mhinduro dzakasiyana dzechaja.
Iyo voltage paMOS chubhu inopatsanurwa neR3 neR2 uye inotumirwa kune inoshanda amplifier IN + kuti ienzaniswe nehuwandu hwakapihwa.Sezvinoratidzwa mumufananidzo, apo potentiometer iri pa10%, IN- iri 1V, ipapo magetsi paMOS tube inofanira kuva 2V.
Constant resistance circuit
Nokuda kwekuramba kupikisa basa, mune dzimwe nhamba dzinodzorwazvinhu zvemagetsi, hapana dunhu rakakosha rakagadzirwa, asi ikozvino inotarirwa nemagetsi ekupinza anoonekwa neMCU pamusana peiyo inogara iripo yedunhu, kuitira kuti iwane chinangwa chekugara kwekudzivirira basa.
Semuyenzaniso, kana kuramba kuri kuramba kuri gumi ohms, uye MCU yaona kuti magetsi ekuisa ari 20V, inodzora kubuda kwazvino kuita 2A.
Zvisinei, iyi nzira ine mhinduro inononoka uye inokodzera chete nguva apo kupinza kunoshanduka zvishoma nezvishoma uye zvinodiwa hazvisi zvepamusoro.Professional kuramba kurambazvinhu zvemagetsizvinogadzirwa nehardware.
Nguva dzose simba redunhu
Nguva dzose simba rekushanda Kwakawandazvinhu zvemagetsianoitwa neanogara aripo edunhu.Musimboti ndewekuti MCU inoverengera yakabuda ikozvino zvichienderana neyakagadzika kukosha kwesimba mushure mekuita sampling voltage yekupinza.
Nguva yekutumira: Oct-19-2022
