30 V / 3 A qhov tsis tu ncua voltage / qhov tam sim no DC adjustable tswj fais fab mov
Cov yam ntxwv ntawm Circuit Court
(1) digital voltmeter voltage ntawm daim ntawv qhia tam sim no, tso saib qhov tseeb 0.1 V ntawm daim ntawv qhia 0.01A
(2) overcurrent tiv thaiv muaj nuj nqi, txwv tam sim no los ntawm ammeter nqis. Ntawd yog, nrog rau qhov ua haujlwm tsis tu ncua tam sim no. Qhov kev ua haujlwm no hauv kev saib xyuas, kev hloov kho ntawm qhov luv-circuit txhaum Circuit Court tuaj yeem tiv thaiv qhov tam sim no loj dhau thiab hlawv lub rooj tsav xwm Circuit Court lossis voltage regulator nws tus kheej.
(3) muaj qhov tsis siv neeg kiv cua tswj Circuit Court, lub hwj huam mov regulator raj kub dab dej tshaj 55 degree cia li pib kiv cua txias.
Txoj Cai Ua Haujlwm
Lub ntsiab Circuit Court: Daim duab 1 muaj 1M31 7, Q1, Q2. Nws yog ib qho kev nthuav dav daim ntawv thov tam sim no ntawm 1M31 7. Tsis siv cov hluav taws xob hluav taws xob nrov nrov IC 1M338, vim tias nws yog rhiab heev rau kev tiv thaiv overcurrent, tam sim ntawd ntau tshaj 5A uas nkag mus rau hauv lub xeev kev tiv thaiv, thiab cov cuab yeej hluav taws xob me (xws li kev xyaum me me, DC motors) pib tam sim no. feem ntau ntau tshaj 5A thiab tsis tuaj yeem nqa inductive loads, uas kuv tau sim. Ammeter sampling resistor R6 yog tias kev siv tooj liab hlau winding, vim qhov kev tiv thaiv tus nqi tsawg dhau, txawm tias tus choj ua ntej ntsuas qhov tseeb, ntxiv rau kev sib cuag (cov pob qij txha) kuj yuav nyob sab nraum qhov yuam kev ntau. Ntawm no yog kev siv ntawm 0.12Ω cement resistor, qhov hluav taws xob poob los ntawm qhov tam sim no raug kho los ntawm RP3 thiab xa mus rau qhov puv ntawm 2V voltmeter taub hau, qhov puv ntawm qhov tam sim no yog 20.00A.
Kev tswj Circuit Court yog pom nyob rau hauv daim duab 2. Tsis tu ncua tam sim no tswj Circuit Court muaj ib tug piv ntawm voltage comparator 1M393, RP4 yog tam sim no hloov potentiometer, thiab precision voltage siv (txog 2.5-2.6V) generated los ntawm IC5 yog xa mus rau inverting input ntawm IC6 tom qab voltage faib los ntawm RP3. Tam sim no tus qauv ntsuas hluav taws xob tsim los ntawm RP4 tom qab sib faib yog xa mus rau hauv-theem input ntawm IC6. Yog tias qhov tseeb tam sim no tshaj qhov teeb tsa tus nqi tam sim no, IC6 tso tawm ib theem siab, Q4 ua, thiab lub peev xwm ntawm 1M317 hloov kho lub davhlau ya nyob twg txo qis → cov zis voltage txo → cov zis tam sim no txo kom txog thaum tam sim no sib npaug rau cov nqi tam sim no. . Nyob rau tib lub sijhawm, Q3 coj, thiab lub teeb-emitting diode VD6 qhia tau hais tias nws nyob hauv lub xeev tam sim no.
Kev tiv thaiv luv luv muaj nuj nqi: 1M317 nws tus kheej muaj kev tiv thaiv zoo tshaj plaws, tab sis qhov tso tawm luv luv tsis tiv thaiv lub raj xa hluav taws xob tam sim no.
Qhov luv luv-circuit tso zis tam sim no ntau dua li qhov teeb tsa tam sim no tus nqi kom Q4 tag nrho conductive, 1M317 tso zis rau * tus nqi me me (li 1.2V) ntawm lub sijhawm no qhov ntsuas luv luv tam sim no tus nqi ntawm cov zaub yog hais txog {{7} } A. Txawm hais tias qhov luv-circuit tam sim no txwv, tab sis vim yog lub diffusion ntawm lub hwj chim raj ntawm lub dissipation ntawm lub hwj chim yog loj, ntev lub sij hawm tseem yog ib tug txaus ntshai * zoo ntxiv cov zis ntawm luv luv-circuit tiv thaiv fuse (5A).
J2 yog qhov chaw tam sim no / tso saib hloov pauv relay. Nyob rau hauv txoj hauj lwm 1, qhov voltage poob ntawm qhov tam sim no sampling resistor R6 yog kho los ntawm RP3 thiab xa mus rau lub ammeter kom pom qhov tseeb tam sim no. Thaum nyob rau hauv txoj hauj lwm 2, qhov voltage hla tam sim no hloov potentiometer RP4 raug xa mus rau ammeter los tso saib cov nqi tam sim no. Lub ammeter yog voltmeter nrog tag nrho ntawm 2 V. Lwm qhov sib piv ntawm 1M393 yog cov kiv cua tswj Circuit Court, thiab ntawm no yog siv hysteresis sib piv Circuit Court. Lub voj voog qhia hauv daim duab ua rau lub kiv cua pib pib ntawm 55 degree thiab nres thaum nws poob qis dua 45 degree. Qhov no txo cov suab nrov thiab txhim kho kiv cua lub neej. rH yog qhov tsis zoo kub coefficient thermistor ntawm 820 ohms thiab yuav tsum tau txuas rau lub dab dej kub. Qhov ntsuas kub tuaj yeem raug xaiv los ntawm kev kho qhov sib thooj ntawm qhov sib piv ntawm hysteresis.
