Cua sov Txoj Cai ntawm Induction Cooker
Induction cooker yog siv los ua cua sov zaub mov raws li lub hauv paus ntsiab lus ntawm electromagnetic induction. Lub qhov cub ntawm qhov induction cooker yog cov phaj kub-resistant ceramic. Lub alternating tam sim no generates ib magnetic teb los ntawm lub kauj nyob rau hauv lub ceramic phaj. Thaum cov kab hlau nplaum nyob rau hauv cov hlau nplaum hla dhau hauv qab ntawm lub lauj kaub hlau, stainless hlau lauj kaub, thiab lwm yam, eddy tam sim no yuav raug generated, uas yuav sai sai cua sov hauv qab ntawm lub lauj kaub, thiaj li mus cuag lub hom phiaj ntawm cua sov zaub mov.
Nws cov txheej txheem ua haujlwm yog raws li hauv qab no: AC voltage hloov dua siab tshiab rau hauv DC los ntawm lub rectifier, thiab tom qab ntawd lub zog DC hloov mus rau hauv high-frequency AC zog uas tshaj lub suab zaus los ntawm high-frequency hwj chim converter. Lub high-frequency AC zog yog ntxiv rau lub tiaj hollow kauv induction cua sov kauj los tsim high-frequency alternating magnetic teb. Cov kab sib nqus ntawm lub zog nkag mus rau hauv ceramic platen ntawm lub qhov cub thiab ua rau lub lauj kaub hlau. Muaj zog eddy tam sim no yog tsim nyob rau hauv lub lauj kaub ua noj vim electromagnetic induction. Lub eddy tam sim no overcomes lub internal kuj ntawm lub lauj kaub los ua kom tiav qhov hloov dua siab tshiab ntawm hluav taws xob lub zog mus rau lub tshav kub lub zog thaum ntws, thiab cov generated Joule tshav kub yog lub tshav kub qhov chaw rau ua noj ua haus.
Circuit Analysis ntawm Induction Cooker Ua Haujlwm Txoj Cai
1. Main Circuit Court
Nyob rau hauv daim duab, tus choj rectifier BI hloov lub zog zaus (50HZ) voltage rau hauv lub zog DC voltage. L1 yog choke thiab L2 yog electromagnetic kauj. Lub IGBT yog tsav los ntawm lub voj voos mem tes los ntawm kev tswj Circuit Court. Thaum IGBT qhib, qhov tam sim no ntws los ntawm L2 nce sai heev. Thaum IGBT raug txiav tawm, L2 thiab C21 yuav muaj cov resonance series, thiab C-ncej ntawm IGBT yuav tsim high-voltage mem tes rau hauv av. Thaum lub mem tes poob rau xoom, lub mem tes tsav tau ntxiv rau IGBT dua kom nws ua tau. Cov txheej txheem saum toj no mus ncig thiab puag ncig, thiab lub ntsiab zaus electromagnetic yoj ntawm txog 25KHZ yog thaum kawg tsim, uas ua rau lub lauj kaub hlau hauv qab muab tso rau ntawm ceramic phaj induce eddy tam sim no thiab ua rau lub lauj kaub kub. Qhov zaus ntawm series resonance siv qhov tsis muaj L2 thiab C21. C5 yog lub hwj chim lim capacitor. CNR1 yog varistor (surge absorber). Thaum AC fais fab mov voltage nce dheev vim qee yam, nws yuav luv luv Circuit Court tam sim ntawd, uas yuav sai sai tshuab lub fuse los tiv thaiv Circuit Court.
2. Pab txhawb zog
Lub zog hloov hluav taws xob muab ob qhov hluav taws xob stabilizing circuits: + 5V thiab + 18V. Lub + 18V tom qab choj rectification yog siv rau tsav Circuit Court ntawm IGBT, IC LM339 thiab kiv cua tsav Circuit Court yog piv synchronously, thiab lub + 5V tom qab voltage stabilization los ntawm peb lub davhlau ya nyob twg voltage stabilizing Circuit Court yog siv rau lub ntsiab tswj MCU.
3. Txias kiv cua
Thaum lub hwj chim qhib, lub ntsiab tswj IC xa tawm lub kiv cua tsav teeb liab (FAN) kom lub kiv cua tig, nqus cov cua txias sab nraud rau hauv lub tshuab lub cev, thiab tom qab ntawd tso tawm cua kub los ntawm sab nraub qaum ntawm lub tshuab lub cev. kom ua tiav lub hom phiaj ntawm cov cua sov dissipation hauv lub tshuab, kom tsis txhob muaj kev puas tsuaj thiab tsis ua haujlwm ntawm qhov chaw vim qhov kub thiab txias ua haujlwm. Thaum cov kiv cua nres lossis cov cua kub tsis zoo, lub ntsuas IGBT tau muab tso rau hauv lub thermistor kom xa cov teeb liab overtemperature rau CPU, nres cua sov, thiab ua tiav kev tiv thaiv. Thaum lub sijhawm fais fab tuag, CPU yuav xa tawm lub teeb pom kev kiv cua, thiab tom qab ntawd CPU yuav xa tawm lub kiv cua tsav teeb liab kom lub tshuab ua haujlwm thaum lub tshuab ua haujlwm ib txwm.
4. Kev tswj kub tsis tu ncua thiab kev tiv thaiv hluav taws xob overheat
Lub luag haujlwm tseem ceeb ntawm lub voj voog no yog hloov qhov ntsuas kub hloov hluav taws xob ntawm qhov tsis kam raws li qhov ntsuas kub tau txais los ntawm thermistor (RT1) hauv qab phaj ceramic thiab thermistor (tsis zoo kub coefficient) ntawm IGBT, thiab xa mus rau lub ntsiab. tswj IC (CPU). CPU ua rau khiav lossis nres teeb liab los ntawm kev sib piv cov nqi kub kub tom qab A / D hloov dua siab tshiab.
5. Lub luag haujlwm tseem ceeb ntawm lub ntsiab tswj IC (CPU)
Lub luag haujlwm tseem ceeb ntawm 18 tus pin tswv IC yog raws li hauv qab no:
(1) Fais fab ON / OFF switching tswj
(2) Lub zog hluav taws xob cua sov / qhov ntsuas kub tsis tu ncua
(3) Tswj ntau yam tsis siv neeg ua haujlwm
(4) Tsis muaj kev kuaj pom thiab tsis siv neeg kaw
(5) Qhov tseem ceeb muaj nuj nqi input nrhiav kom tau
(6) Kev kub siab nce kev tiv thaiv hauv lub tshuab
(7) Kev tshuaj xyuas lub lauj kaub
(8) Lub tshuab hluav taws xob saum npoo cua sov ceeb toom
(9) Txias kiv cua tswj
(10) Tswj ntawm ntau yam vaj huam sib luag qhia
6. Load tam sim no nrhiav tau Circuit Court
Nyob rau hauv no Circuit Court, T2 (transformer) yog txuas nrog nyob rau hauv series mus rau kab nyob rau hauv pem hauv ntej ntawm DB (bridge rectifier), yog li ntawd lub AC voltage ntawm T2 thib ob sab yuav muaj kev cuam tshuam qhov kev hloov ntawm input tam sim no. Qhov no AC voltage yog ces hloov mus rau hauv DC voltage los ntawm D13, D14, D15 thiab D5 tag nrho nthwv dej rectification, thiab cov voltage yog ncaj qha xa mus rau CPU rau AD hloov dua siab tshiab tom qab voltage faib. CPU txiav txim qhov loj me tam sim no raws li qhov hloov pauv AD tus nqi, suav lub zog los ntawm software thiab tswj PWM cov zis loj los tswj lub zog thiab kuaj xyuas cov khoom thauj.
7. Tsav Circuit Court
Lub Circuit Court amplifies lub mem tes teeb liab tso zis los ntawm lub mem tes dav hloov Circuit Court mus rau lub teeb liab muaj zog txaus tsav lub IGBT qhib thiab kaw. Qhov dav ntawm cov tswv yim mem tes dav, lub sijhawm qhib IGBT ntev dua. Qhov ntau dua qhov tso zis hluav taws xob ntawm coil cooker, qhov hluav taws xob ntau dua.
8. Synchronous oscillation voj
Lub oscillating circuit (sawtooth yoj generator) tsim los ntawm synchronous detection voj muaj li ntawm R27, R18, R4, R11, R9, R12, R13, C10, C7, C11 thiab LM339, uas nws oscillating zaus yog synchronized nrog cov ua hauj lwm zaus ntawm lub cooker. PWM modulation, outputs ib tug synchronous mem tes los ntawm tus pin 14 ntawm 339 tsav tsheb rau ruaj khov.
9. Surge tiv thaiv Circuit Court
Kev tiv thaiv hluav taws xob muaj xws li R1, R6, R14, R10, C29, C25 thiab C17. Thaum lub surge siab dhau lawm, tus pin 339 2 tso tawm ib theem qis, ntawm ib sab, nws qhia MUC kom nres lub zog, ntawm qhov tod tes, nws tua K teeb liab los ntawm D10 kom tua lub zog tso zis.
10. Dynamic voltage nrhiav tau Circuit Court
Qhov ntsuas hluav taws xob ntsuas hluav taws xob tsim los ntawm D1, D2, R2, R7, thiab DB yog siv los xyuas seb lub zog hluav taws xob puas nyob hauv thaj tsam ntawm 150V ~ 270V tom qab CPU ncaj qha hloov pauv cov mem tes yoj AD.
11. Instantaneous high voltage tswj
R12, R13, R19 thiab LM339 yog tsim. Thaum qhov hluav taws xob rov qab zoo li qub, qhov Circuit Court no yuav tsis ua haujlwm. Thaum qhov hluav taws xob tam sim no siab tshaj 1100V, tus pin 339 1 yuav tso zis qis, rub PWM, txo cov zis hluav taws xob, tswj qhov hluav taws xob rov qab, tiv thaiv IGBT, thiab tiv thaiv overvoltage tawg.
Post lub sij hawm: Oct-20-2022
