Yooj Yim DC - DC Boost Converter Siv 555: 4 Cov Kauj Ruam

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

Nws feem ntau muaj txiaj ntsig hauv kev sib tw kom muaj hluav taws xob ntau dua. Tog twg los muab +ve thiab -ve txoj kab rau op -amp, tsav lub suab nrov, lossis txawm tias xa tawm yam tsis xav tau roj teeb ntxiv.

Nov yog qhov yooj yim 5V rau 12V DC hloov pauv ua siv lub 555 timer thiab ob peb 2N2222 transistors. Dedicated ICs twb muaj los ua txoj haujlwm no thiab lawv ua tau ntau yam zoo dua li qhov tsim qauv no - txoj haujlwm no lom zem rau sim nrog thiab muaj kev nkag siab tias yuav ua li cas cov kab hluav taws xob no ua haujlwm.

Kauj Ruam 1: Yooj Yim Ua Haujlwm

Lub Circuit Court ua haujlwm los ntawm kev kaw lub transistor, ua haujlwm zoo rau hauv av. Qhov no ua rau cov dej loj ntws mus rau qhov inductor. Thaum lub transistor qhib qhov sib nqus sib nqus hauv qhov inductor ua rau qhov hluav taws xob nce, feem ntau ntau dua li cov roj teeb hluav taws xob. Yog tias qhov hluav taws xob tsim tawm siab dua qhov hluav taws xob khaws cia hauv lub capacitor lub diode kaw thiab tso cai rau lub capacitor kom them.

Siv lub tshuab hluav taws xob teeb tsa los tsav lub transistor Kuv pom tias rau kuv qhov tseem ceeb (qhov uas kuv khaws los ntawm cov khoom siv hluav taws xob pov tseg) Kuv xav tau zaus ib puag ncig 220KHz los tsim 15V. Ib lub tswv yim tawm tswv yim yuav tom qab ntawd tswj qhov zaus los sim ua kom ruaj khov 12V ntawm ntau yam kev thauj khoom.

Kauj ruam 2: Astable Circuit

Muaj ntau yam 555 oscillator circuits online, tab sis kuv tau tsim kuv li no.

Cov zis, tus pin 3, yog siv los them thiab tso tawm lub capacitor ntawm tus tiv thaiv. Qhov hluav taws xob nyob thoob plaws lub capacitor raug saib xyuas kom toggle tus pin tso tawm.

Yog tias siv cov khoom siv 6V nws yooj yim pom op-amps muaj 2V thiab 4V siv qhov hluav taws xob. Ob qho op-amps tau tshuaj xyuas qhov ntsuas hluav taws xob thiab yog li cov pins (2 thiab 6) tau txuas ua ke.

Yog tias qhov hluav taws xob nce siab dua 4V sab saum toj op-amp mus siab Rov pib dua lub latch, lub tshuab hluav taws xob pib tso tawm kom txog thaum poob qis dua 2V ntawm qhov taw tes hauv qab op-amp yuav nce siab thiab teeb tsa lub latch. Ib zaug ntxiv them lub capacitor.

Cov kab uas hla daj qhia pom lub peev xwm them nyiaj thiab tso tawm thaum cov kab xiav qhia pom cov pin tso tawm 3 tsim cov square'ish yoj ntawm 190KHz.

Kauj Ruam 3: Lub Loop Cov Lus Teb

Qhov yuav tsum tau ua rau cov lus tawm tswv yim yog kom txo qhov zaus thaum qhov hluav taws xob tso tawm tau siab dhau, thiab nce qhov zaus thaum qhov hluav taws xob tau qis dhau.

Txoj hauv kev yooj yim tshaj plaws uas kuv tuaj yeem xav ua qhov no yog los ntawm kev siv lub transistor los ntshav tam sim no thaum lub sijhawm them nqi hluav taws xob.

Thaum lub voj voog no DISCHARGE tus pin 7 ua haujlwm qis, tso cai rau cov ntshav hauv lub cev mus nyiag tam sim no los ntawm lub capacitor.

Lub hauv paus qhov hluav taws xob - 0.65V tam sim no nyob ntawm tus xa tawm, qhov hluav taws xob no hla qhov R resistor ruaj khov yuav tswj tau qhov ruaj khov tam sim no, uas yuav tsum tau los ntawm lub tshuab hluav taws xob them tam sim no, ua rau qeeb qeeb thiab txo qis. Qhov siab dua qhov hluav taws xob, qhov tam sim no ntau dua los ntawm kev them nqi thiab qis dua. Uas haum peb cov kev xav tau raws nraim.

Kev sim nrog qhov tseem ceeb, tab sis kuv xaiv 3K rau lub hauv paus tiv thaiv vim li no:

Ntawm nws qhov qis tshaj plaws tus capacitor zaum ntawm kwv yees li 2V. Los ntawm 5V muab qhov no txhais tau tias 3V hla 3K resistor yuav pib them lub capacitor nrog 1mA.

Nrog 1V preset ntawm tus emitter hla 3K resistor yuav kos 1/3 ntawm qhov tam sim no, lossis 333uA… uas kuv xav tias yuav yog qhov ntshav zoo tam sim no. Lub hauv paus hluav taws xob los ntawm lub zog ntsuas hluav taws xob, tsim qhov faib hluav taws xob nrog qhov hluav taws xob peb xav saib xyuas, piv txwv li 12V tso tawm. Raws li tus potentiometer tau kho tau tus emitter resistor tus nqi tsis tseem ceeb. Kuv xaiv 20K potentiometer rau qhov no.

Kauj Ruam 4: Ua tiav Circuit

Kuv tsuas yog muaj qhov saum npoo diode muaj uas tuaj yeem pom cov laug rau hauv qab ntawm lub rooj tsavxwm.

Lub Circuit Court tau sim los ntawm 5V muab los ntawm Arduino, thiab ua haujlwm tau zoo 12V lub tswb nrov, DC lub cev muaj zog, 12V relay lossis cov diodes tsis tas yuav tsum tau siv 12V sab nraud.