Lub hauv paus ntsiab lus ntawm kev ua haujlwm siab DC stabilized fais fab mov nrog qhov tsis tu ncua voltage thiab tam sim no
Lub tshuab tag nrho tau muab faib ua plaub ntu: series hom DC stabilized fais fab mov, suav nrog kev hloov kho amplification thiab qhov hluav taws xob tsis tu ncua; Cov kev cai tam sim no tsis tu ncua thiab qhov tsis tu ncua voltage tsis tu ncua tam sim no hloov dua siab tshiab zaub seem; Reference stabilized fais fab mov; Tsis siv neeg hloov Circuit Court rau theem nrab AC voltage ntawm transformer.
1. Series hom DC stabilized fais fab mov thiab qhov hluav taws xob tsis tu ncua. Nws tsuas yog muaj kev hloov kho T1, T2, T10, thiab T11. Lub chaw ua haujlwm amplifier IC1, p1, p2 voltage hloov kho potentiometers, thiab siv qhov hluav taws xob tsim hluav taws xob tsis tu ncua los tswj T2 lub hauv paus voltage, hloov cov conductivity ntawm lub raj hloov, thiab xyuas kom meej lub cev ua haujlwm ntawm qhov voltage stabilizing circuit. Ntawm no, p1 thiab p2 yog siv los ua ntxhib thiab nplua potentiometers los kho qhov voltage. Kev siv hluav taws xob thiab kev hloov pauv hluav taws xob txuas nrog tib theem kawg ntawm IC1, thiab muab piv nrog cov qauv ntsuas hluav taws xob ntawm cov theem rov qab los hloov qhov tam sim no ntawm lub raj hloov.
2. Tsis tu ncua tam sim no Circuit Court - tseem hu ua tam sim no limiting circuit. Thaum kho raws li qhov kev txwv tam sim no, cov zis tam sim no tseem tsis hloov pauv, thiab cov zis hluav taws xob txo qis proportionally nrog kev nce ntxiv hauv kev thauj khoom. Lub Circuit Court tam sim no muaj xws li ib qho kev ua haujlwm amplifier IC2 thiab ib qho piv txwv ntawm 0.15 Ω, nrog rau qhov hluav taws xob tsis tu ncua thiab qhov kev hloov pauv tam sim no tsis tu ncua. Cov kev siv hluav taws xob tau txais los ntawm P3 tam sim no hloov potentiometer thiab siv fais fab mov hloov W1 ntawm tib theem kawg ntawm IC2, thiab cov theem rov qab kawg yog txuas nrog rau pem hauv ntej kawg ntawm cov qauv resistor 0.15 Ω los ntawm ib tug resistor 1k Ω. Thaum cov qauv ntsuas hluav taws xob ntau dua li qhov siv hluav taws xob, qhov tso zis hluav taws xob ntawm IC2 txo qis, ua rau txo qis hauv Vb ntawm T2 thiab txo qhov tso zis voltage. Txawm li cas los xij, cov zis tam sim no tseem tsis hloov pauv, ua tiav lub hom phiaj ntawm kev txwv tam sim no. Ntawm qhov hluav taws xob tas li, T8 ua thiab T9 txiav tawm, yog li lub teeb ntsuab rau qhov hluav taws xob tsis tu ncua (CV) yog qhib thiab lub teeb liab rau qhov tam sim no (CC) raug kaw. Vim tias cov zis IC2 nyob rau theem siab ntawm qhov hluav taws xob tas li, T8 ua thiab lub teeb ntsuab yog nyob ntawm qhov hluav taws xob tswj hluav taws xob DZ (6V). Thaum qhov kev txwv txwv tam sim no ua lub luag haujlwm tiv thaiv, cov zis ntawm IC2 yog 0. Lub sijhawm no, Vb ntawm T2 poob rau 0 los ntawm qhov hluav taws xob diode, ua rau lub raj hloov kho tau txiav tawm.
3. Reference stabilized fais fab mov. Ua los ntawm TL431 thiab 78L12, T3. TL431 tsis tsuas yog ua haujlwm raws li tus qauv hluav taws xob, tab sis kuj tseem ua lub luag haujlwm hauv kev ua kom muaj zog yuam kev thiab tswj T3 transistors. Internal reference voltage ntawm TL431 yog 2.5V. Qhov tseeb sampling voltage yog piv nrog 2.5V siv voltage ntawm TL431, thiab cathode voltage ntawm TL431 yog hloov kho cov conductivity ntawm T3. Tsis tas li ntawd, lub hauv paus voltage ntawm T3 yog stabilized los ntawm 78L12 thiab ces dhau los ntawm ib tug resistor 1k Ω mus rau hauv paus, ua kom cov zis +15V ruaj khov. Cov zis+15V feem ntau yog siv los ua qhov siv hluav taws xob rau IC1 thiab IC2 kev ua haujlwm ntawm lub tshuab hluav taws xob, cov khoom siv hluav taws xob tsis tu ncua thiab cov khoom siv tam sim no, thiab cov kev siv hluav taws xob rau AC voltage switching circuits 6V yog txuas nrog cov zis zoo ntawm lub ntsiab voltage regulator.
4. Cov zis tau hloov pauv ntawm +10V thiab +20V. Lub hauv paus ntawm T6 txuas nrog rau qhov siv hluav taws xob los ntawm 45k Ω resistor, uas yog muab los ntawm kev siv hluav taws xob. Lwm sab ntawm lub hauv paus yog txuas nrog cov zis tsis zoo ncej ntawm lub ntsiab fais fab mov los ntawm 18k Ω resistor thiab ib tug series txuas diode rau sampling. Thaum cov zis hluav taws xob qis dua 10V, T6 conducts, T7 kaw, relay J2 tso tawm, thiab ib txwm kaw kev sib cuag yog txuas nrog lub input voltage ntawm AC 14V qis iav. Thaum cov zis DC voltage nce mus txog 10V, T6 lub hauv paus voltage tshwm tsis zoo thiab txiav tawm, yog li T7 conducts, relay J2 kaw, thiab ib txwm kaw kev sib cuag yog txuas ntawm 24 V siab iav. Thaum tag nrho cov zis hluav taws xob ntawm qhov ntsuas hluav taws xob nce mus txog +20V, T5 raug txiav tawm, T4 yog conductive, J1 raug kaw, thiab ib txwm qhib kev sib cuag ntawm J1 txuas nrog. Kho qhov input voltage ntawm tus regulator rau AC hloov mus rau lub thib peb siab iav 32. Lub TpR adjustable voltage regulator yeej ib txwm ua kom ib tug tej yam voltage txawv thaum kho qhov voltage, feem ntau yog cia siab rau tsis siv neeg hloov ntawm AC voltage.
