qhov yooj yim rooj tsav tsheb ntawm qhov khoom qis hluav taws xob tsawg
Qhov siab tshaj plaws ntawm lub rooj vag-qhov siab ntawm lub hwj chim FET yog li ntawm 20V, yog li nyob rau hauv 24V daim ntawv thov, lub qhov rooj nkag-qhov hluav taws xob yuav tsum tsis pub tshaj 20V, uas ua rau kom tsis yooj yim dua qhov Circuit Court. Tiam sis hauv cov ntawv sau nrog 12V los yog tsawg dua, lub Circuit Court yuav ua tau yooj yim heev.
Daim duab sab laug qhia txog ib sab ntawm 12V, thiab lub triode ib sab ntawm lub voj voog loj yog hloov los ntawm ob qho tag nrho ob qho thiab ob lub cev. (Nco ntsoov tias cov logic nyob rau hauv daim duab saum toj no yog rov qab.) Vim qhov muaj qhov loj qhov rooj ntawm qhov FET, them tus nqi hluav taws xob ntawm R3 thiab R4 ua rau FET mus qis dua conduction; thiab ncaj qha mus tso tawm lub qhov rooj nkag los ntawm qhov diode ua haujlwm rau cov nyhuv tom teb. Lub raj yog muab txiav tawm sai sai no, yog li tsis txhob siv lub xeev txoj kev kuaj mob.
Qhov kev cog lus ntawm no yuav tsum muaj lub voj voog nyiaj-square nrog lub ntse ntug ntawm cov IN input. Yog li, tom qab lub teeb liab tswj kev txuas los ntawm ib tug microcontroller los yog lwm yam khoom qhib-tso tawm, nws yuav tsum dhau lub Schmitt trigger (xws li 555) los yog kev sib piv nrog high-speed nrog lub laub rub tawm. Yuav tau txais lub IN kawg. Yog hais tias qhov kev tawm tswv yim qeeb qeeb, diode qeeb Circuit Court yuav plam nws cov nyhuv.
Kev xaiv ntawm R3 thiab R4 muaj feem xyuam rau kev nce thiab nqis ntog ntawm ntug ntawm lub teeb liab. Lub steeper ntawm ntug teeb ntawm lub teeb liab, lub R3 thiab R4 yuav raug xaiv, thiab qhov ceev cov kev hloov ceev yuav ua tau. Hauv kev ua zog nce hauv qhov kev ua si Robocon (zoo sib xws), 555 siv ua ntej IN.
Thib peb, qhov kev ncua sij hawm ntawm ntug nres tsheb
Nyob rau hauv cov txheej txheem ua ntej logic, qhov poob ntawm txoj kev tswj PMOS thiab qhov nce ntawm kev tswj NMOS txhob txwm tshaj tawm qeeb, thiab tom qab ntawd ces yuav tsum yog qhov square wave, thiab txoj kev sib tw hauv lub xeev ntawm FET yuav raug pov tseg. Tsis tas li ntawd, qhov no yuav ua kom yooj yim rau lub rooj vag tsav tsheb ntawm qhov kawg ntawm theem, thiab tuaj yeem ua kom tsis muaj teeb meem laub-tsav tsav qhov rooj, uas tsis tas yuav tsum xav txog lub qhov rooj loj npaum li cas, thiab tuaj yeem ua kom zoo dua rau FETs. Tsav tsheb khiav ntawm no tau siv rau xyoo 2003 Robocon kev sib tw. Cov nram no yog qhov kev ncua sij hawm ntawm ob hom ntawm cov npoo:
Lub rooj vag ntawm lub rooj vag no muaj ob-theem transistor: cov theem hauv ntej muab qhov tseeb qhov yuav tsum tau tsav lub qhov rooj ntawm FET, thiab tom kawg theem yog theem ib tus emitter follower uas txo cov zis impedance thiab tshem tawm cov teebmeem ntawm lub qhov rooj loj capacitance. Yuav kom ntseeg tau tias lub xeev tsis tau qhib, lub tswv yim ntawm ntug yuav tsum yog tus ntxhab, thiab cov lus cog tseg saum toj no uas qeeb thiab rov ua dua cov saum toj no yuav ua tau.
Plaub, lwm yam tsav hluav taws xob
(Relay + semiconductor fais fab tuag cov tswv yim)
Qhov kev txuas ntawd muaj qhov zoo ntawm qhov muaj zog tam sim no thiab ruaj khov, uas tuaj yeem tsim cov qauv tsim ntawm cov qauv hluav taws xob. Nyob rau hauv lub voj voog tsav tsheb uas xav tau kom ua tiav cov cai tswj ceev, lub xov tooj cua kuj tseem siv tau. Ib qho kev daws teeb meem yog los siv kev sib tshuam los tswj cov kev taw qhia txog qhov tam sim no kom hloov txoj kev taw qhia ntawm lub tshuab. Siv tsis tau ib qho FET ntxiv tam sim no (xws li IRF3205, feem ntau muaj N nkaus hom ntxiv rau tam sim no), PWM cov cai tswj ceev tau tiav, raws li pom hauv daim duab zoo. Qhov no yog ib txoj hauv kev ua tiav tshwj xeeb tshaj plaws kev tsav tsheb.
Yog tias koj xav yuav ib lub cav fais fab, thov mloog fais fab tshuab xam fais fab.
