LINEAR VOLTAGE REGULATORS 78XX: 6 Kauj Ruam

2024 Tus sau: John Day | [email protected]. Kawg hloov kho: 2024-01-30 09:24

Ntawm no peb xav qhia koj yuav ua li cas nrog 78XX txoj kab hluav taws xob ntsuas hluav taws xob. Peb yuav piav qhia yuav ua li cas txuas lawv mus rau lub zog hluav taws xob thiab dab tsi yog qhov txwv ntawm kev siv cov ntsuas hluav taws xob.

Ntawm no peb tuaj yeem pom cov tswj hwm rau: 5V, 6V, 9V, 12V, 18V, 24V. Txhawm rau ua kom tiav txhua qhov kev tawm dag zog koj yuav xav tau cov khoom muaj npe hauv qab no:

Khoom siv:

• LM7805, LM7812
• Li-Ion 7.4 V Roj Teeb Pob
• Li-Po 14.8 V Roj Teeb
• 01. thiab 0.33 uF electrolytic lossis ceramic capacitors
• Breadboard, Jumper Wires
• Arduino Ib

Kauj ruam 1: Pinout Txheej txheem cej luam

Pinout rau LM78XX yog tib yam rau lawv txhua tus. Raws li koj tuaj yeem pom los ntawm daim duab saum toj no, tus pin sab laug tshaj yog nkag, tus pin nruab nrab thiab lub dav hlau loj nyob rau sab saum toj ntawm tus tswj hwm yog hauv av, thiab lub davhlau ya nyob twg sab xis yog tso tawm (tswj qhov voltage).

• Hauv qhov no peb txuas cov xaim liab (ntxiv rau lub davhlau ya nyob twg) los ntawm roj teeb
• GND Ntawm no peb txuas cov xaim dub (hauv av) los ntawm roj teeb
• Tawm ntawm no peb txuas lub zog faib hluav taws xob nkag (txhua lub cuab yeej uas peb tau them), rau LM7805 tus pin no yuav tso tawm 5V.

Kauj Ruam 2: LM78XX Cov Hluav Taws Xob

Lub Circuit Court peb tab tom tsim yog tib yam rau txhua tus LM78XX tus tswj hluav taws xob. Lub voj voog no yog rau cov zis ruaj khov. Peb tsuas xav tau tus tswj hwm thiab ob lub capacitors 0.1 uF thiab 0.33 uF los ua nws. Nov yog yuav ua li cas lub Circuit Court zoo li ntawm lub khob cij:

Cov txheej txheem thaiv yog raws li hauv qab no:

• Txuas LM78XX mus rau lub khob cij.
• Txuas lub 0.1 uF capacitor nrog tus lej PIN. Yog tias koj siv cov tshuab hluav taws xob electrolytic nco ntsoov txuas mus rau - rau GND.
• Txuas lub 0.33 uF capacitor nrog tus OUT tus pin.
• Txuas IN nrog lub davhlau ya nyob twg ntxiv ntawm lub zog siv
• Txuas GND nrog rho tawm lub davhlau ya nyob twg ntawm lub zog siv
• Txuas OUT tus pin nrog lub davhlau ya nyob twg ntxiv ntawm lub cuab yeej uas koj xav kom them.

Kauj Ruam 3: LM7805 Circuit

Lub Circuit Court rau LM7805 yuav muab raws li qhov tso tawm ruaj khov 5V tam sim no. Qhov tseem ceeb ntawm no los txiav txim siab yog qhov loj npaum li cas thiaj li yuav tsum tau nkag mus? Qhov tsim nyog qhov hluav taws xob poob rau tus tswj hwm ua haujlwm kom raug yog 2V uas txhais tau tias qhov tsawg kawg nkaus voltage yuav tsum yog 7V. Nco ntsoov tias raws li cov roj teeb ua kom lub zog sab hauv poob. Txhawm rau kawm paub ntau ntxiv txog roj teeb thov mus saib ntu ntawd.

Ntawm no peb yuav siv 2x 3.7 Li-Ion Roj teeb hauv koob. Qhov ntawd yuav muab rau peb nrog tus nqi nruab nrab ntawm 7.4 V. Uas zoo rau peb cov ntaub ntawv, peb yuav muaj qhov hluav taws xob poob ntawm 2.4 V. Txhua qhov hluav taws xob poob qis tau hloov mus ua cua sov. Yog li koj xav khaws qhov poob mus rau qhov tsawg kawg nkaus.

Lwm lub roj teeb zoo tshaj plaws rau rooj plaub no yuav yog 2S Li-Po roj teeb, qhov teeb meem ntawm no yuav yog cov txuas uas feem ntau tuaj nrog cov roj teeb no. Thov xa mus rau Lub Roj Teeb lossis ntu txuas kom paub ntau ntxiv.

Raws li daim ntawv kawg: lub roj teeb yooj yim tshaj plaws yuav yog 9 V Alkaline roj teeb, tsuas yog nco ntsoov tias koj tab tom poob 4 V ntawm lub roj teeb yog tias koj siv nws. Nws yooj yim tshaj plaws vim tias nws yooj yim pom hauv khw muag khoom hauv zos.

Cov zis tam sim no siv los them nqi Arduino Uno los ntawm 5V I/O tus pin. Hauv av tau txuas nrog cov hauv paus av ntawm lub roj teeb thiab tus tswj hwm. Koj tuaj yeem xaiv kom muaj zog ntau li 5V cov cuab yeej zoo li koj tuaj yeem pom hauv txoj kev no.

Kauj Ruam 4: LM7812 Circuit

Lub Circuit Court rau LM7812 txawv ntawm LM7805 Circuit Court nkaus xwb hauv qhov tawm thiab tso tawm qhov hluav taws xob. Peb tseem muaj 2V poob, txhais tau tias peb xav tau yam tsawg 14V. Zoo meej rau qhov xwm txheej no yog 4S Li-Po Roj teeb uas muaj hluav taws xob ntawm 14.8 V.

Tam sim no peb muaj lub hwj chim 12V, tab sis rau dab tsi peb tuaj yeem siv nws? Tsis muaj ntau tus tswj xws li Arduino uas khiav ntawm 12 V, lossis cov qauv xws li PS2 Joystick. Lawv txhua tus 5V lossis txawm tias 3.3V. Qhov pom tseeb tshaj plaws uas peb txhawb zog nrog 12V yog lub cav. Cia peb tham txog qhov ntawd hauv ntu tom ntej.

Kauj Ruam 5: Kev Ntsuas Tam Sim No

LM78XX tus tswj hwm yog qhov zoo yog tias peb xav tau lub zog txhawb cov cuab yeej xav tau cov dej ntws qis. Xws li cov tswj hwm, tus tsav tsheb, tus qauv, lub ntsuas hluav taws xob thiab lwm yam Peb kuj tseem tuaj yeem siv lawv los txhawb lub zog tsis muaj zog xws li servo motors SG90, lub tshuab me me. Tab sis yog tias peb xav tau lub zog ua kom lub cev muaj zog siv txav cov neeg hlau lossis tsheb sib tw peb yuav xav tau kom muaj dej ntws loj dua.

Peb yuav luag tsis muaj ib lub cav rau ntawm peb cov neeg hlau, peb zoo li muaj txog 4 lub cav, thiab feem ntau lawv tag nrho yam tsawg kawg ntawm 3.5 A hauv qhov xav tau tam sim no.

LM78XX tus tswj hluav taws xob muaj 1-1.5 Kev ntsuas tam sim no tsis tu ncua, nyob ntawm tus tsim khoom. Tsuas yog kom nyab xeeb hais tias peb muaj 1 Qhov txwv tam sim no tsis tu ncua. Peak tam sim no rau cov tswj hwm no yuav yog 2.2 A, tsuas yog muab tso rau hauv qhov sib piv 4 lub tshuab hluav taws xob yuav muaj qhov siab tshaj tam sim no txog li 9.6 A.

Raws li koj tuaj yeem pom peb tsis tuaj yeem siv cov tswj hwm no rau kev coj ua zoo li no. Nco ntsoov tias peb tsis tuaj yeem tso ntau tus tswj hwm ua ke kom muaj kev ntsuas siab dua tam sim no.

Kauj Ruam 6: Xaus

Peb xav los tham txog yam peb tau qhia ntawm no.

• LM78XX tau siv los tsim cov hluav taws xob ruaj khov
• Txhua LM78XX muaj tib lub Circuit Court
• Peb yuav tsum muaj 2V ntau ntxiv ntawm cov tswv yim ntau dua li qhov peb xav kom muaj ntawm cov zis
• Steady Tam sim no ntsuas yog 1 A lossis 1.5 A nyob ntawm tus tsim khoom

Yog tias koj xav paub yuav ua li cas txhawb nqa cov cuab yeej xav tau ntau ntxiv, thov mus saib peb ntu ntawm DC-DC Converters.

Koj tuaj yeem rub tawm cov qauv uas peb tau siv hauv qhov kev qhia no los ntawm peb tus lej GrabCAD:

GrabCAD Robottronic Qauv

Koj tuaj yeem pom peb lwm cov lus qhia ntawm Instructables:

Cov lus qhia Robottronic

Koj tseem tuaj yeem tshawb xyuas Youtube channel uas tseem tab tom ncaws tawm:

Youtube Robottronic