Uyini umgomo wokusebenza we-induction cooker

1. Isifunda esikhulu
Emfanekisweni, ibhuloho elilungisa kabusha i-BI lishintsha i-voltage yefrikhwensi yamandla (50HZ) ibe i-voltage DC edonsayo. I-L1 iyikhoyili futhi i-L2 iyikhoyili kagesi. I-IGBT ishayelwa ukushaya kwe-rectangular kusuka kusekethe yokulawula. Uma i-IGBT ivuliwe, okwamanje egeleza nge-L2 ikhula ngokushesha. Lapho i-IGBT inqanyulwa, i-L2 ne-C21 izoba ne-resonance yochungechunge, futhi i-C-pole ye-IGBT izokhiqiza i-high-voltage pulse phansi. Lapho ukushaya kwenhliziyo kwehlela ku-zero, i-drive pulse yengezwa ku-IGBT futhi ukuze iyenze isebenze. Inqubo engenhla iyajikeleza futhi ijikeleza, futhi igagasi eliyinhloko le-electromagnetic wave elicishe libe ngu-25KHZ liyakhiqizwa, okwenza ibhodwe lensimbi libekwe phansi epuletini le-ceramic livuse i-eddy current futhi lenze ibhodwe lishise. Imvamisa ye-resonance yochungechunge ithatha imingcele ye-L2 ne-C21. I-C5 iyi-capacitor yokuhlunga amandla. I-CNR1 iyi-varistor (i-surge absorber). Lapho i-voltage ye-AC power supply ikhuphuka ngokuzumayo ngesizathu esithile, izofinyezwa ngokushesha, okuzoqhumisa ngokushesha i-fuse ukuvikela umjikelezo.

2. Ukunikezwa kwamandla okusiza
Amandla ashintshayo ahlinzeka ngamasekethe amabili wokusimamisa ama-voltage:+5V kanye+18V. I+18V ngemva kokulungiswa kwebhuloho isetshenziselwa isekethe yedrayivu ye-IGBT, i-IC LM339 kanye nesekethe yedrayivu yabalandeli kuqhathaniswa ngokuhambisanayo, kanye ne+5V ngemva kokusimamisa i-voltage yisekethe yokusimamisa kagesi yamatheminali amathathu isetshenziselwa isilawuli esikhulu se-MCU.

3. Ukupholisa fan
Lapho amandla evuliwe, isilawuli esiyinhloko se-IC sithumela isignali ye-fan drive (FAN) ukuze igcine ifeni ijikeleza, ihogele umoya obandayo wangaphandle emzimbeni womshini, bese ikhipha umoya oshisayo ohlangothini olungemuva lomshini womshini. ukufeza inhloso yokukhishwa kokushisa emshinini, ukuze ugweme ukulimala nokwehluleka kwezingxenye ngenxa yokushisa okuphezulu kwendawo yokusebenza. Uma ifeni ima noma ukukhishwa kokushisa kukubi, imitha ye-IGBT inamathiswa ne-thermistor ukuze idlulisele isignali yezinga lokushisa elingaphezulu ku-CPU, imise ukushisisa, futhi ithole ukuvikeleka. Okwamanje amandla okukhanyisa, i-CPU izothumela isignali yokuthola abalandeli, bese i-CPU izothumela isignali yedrayivu yabalandeli ukuze yenze umshini usebenze lapho umshini usebenza ngokujwayelekile.

4. Ukulawula izinga lokushisa njalo kanye nesifunda sokuvikela ukushisa ngokweqile
Umsebenzi oyinhloko walesi sekethi ukushintsha izinga lokushisa elishintsha iyunithi ye-voltage yokumelana ngokuvumelana nezinga lokushisa elizwakala i-thermistor (RT1) ngaphansi kwepuleti le-ceramic kanye ne-thermistor (i-coefficient yokushisa engemihle) ku-IGBT, bese uyidlulisela ku-main. lawula i-IC (CPU). I-CPU yenza isignali esebenzayo noma yokumisa ngokuqhathanisa inani lezinga lokushisa elimisiwe ngemva kokuguqulwa kwe-A/D.

5. Imisebenzi esemqoka ye-main control IC (CPU)
Imisebenzi esemqoka ye-18 pin master IC imi kanje:
(1) Ukulawula ukushintsha kokuvula/KUVALE
(2) Amandla okushisa/ukulawula izinga lokushisa njalo
(3) Ukulawulwa kwemisebenzi ehlukahlukene ezenzakalelayo
(4) Akukho ukutholwa komthwalo kanye nokuvala shaqa okuzenzakalelayo
(5) Ukuthola okokufaka komsebenzi obalulekile
(6) Ukuvikelwa kokukhuphuka kokushisa okuphezulu ngaphakathi komshini
(7) Ukuhlolwa kwebhodwe
(8) Isaziso sokushisisa ngokweqile kwendawo yomlilo
(9) Ukupholisa isilawuli sabalandeli
(10) Ukulawulwa kwezibonisi zamaphaneli ahlukahlukene

6. Layisha isifunda sokutholwa samanje
Kulo mjikelezo, i-T2 (i-transformer) ixhunywe ochungechungeni emugqeni ophambi kwe-DB (isilungisi sebhuloho), ngakho-ke i-voltage ye-AC ohlangothini lwesibili lwe-T2 ingabonisa ushintsho lwamanje okufakwayo. La mandla kagesi e-AC abe eseguqulwa abe amandla kagesi e-DC ngokusebenzisa i-D13, i-D14, i-D15 ne-D5 yokulungiswa kwamagagasi agcwele, futhi i-voltage ithunyelwa ngokuqondile ku-CPU ukuze iguqulwe i-AD ngemva kokuhlukaniswa kwe-voltage. I-CPU ihlulela usayizi wamanje ngokwenani le-AD eliguquliwe, ibala amandla ngesofthiwe futhi ilawule usayizi ophumayo we-PWM ukuze ulawule amandla futhi ibone umthwalo

7. Drive circuit
Isekhethi ikhulisa ukuphuma kwesignali ye-pulse kusuka kumjikelezo wokulungisa ububanzi be-pulse kuya kumandla esignali anele ukushayela i-IGBT ukuthi ivule futhi ivale. Ububanzi be-pulse yokufaka bubanzi, isikhathi sokuvula se-IGBT siba side. Uma amandla okukhiphayo e-coil cooker emakhulu, ayanda amandla omlilo.

8. Iluphu ye-oscillation evumelanayo
I-oscillating circuit (i-sawtooth wave generator) ehlanganiswe ne-synchronous discovery loop ehlanganiswe ne-R27, R18, R4, R11, R9, R12, R13, C10, C7, C11 kanye ne-LM339, imvamisa yayo yokuzulazula ivumelaniswa nemvamisa yokusebenza kwesipheki ngaphansi. I-PWM modulation, ikhipha i-synchronous pulse ngokusebenzisa iphinikhodi 14 kwangu-339 ukuze ishayele ukusebenza okuzinzile.

9. Isekhethi yokuvikela ukuqhuma
Isekhethi yokuvikela i-surge ihlanganiswe i-R1, i-R6, i-R14, i-R10, i-C29, i-C25 ne-C17. Lapho ukuhlinzwa kuphezulu kakhulu, iphinikhodi engu-339 2 ikhipha izinga eliphansi, ngakolunye uhlangothi, yazisa i-MUC ukumisa amandla, ngakolunye uhlangothi, ivala isignali ye-K nge-D10 ukuze ivale ukuphuma kwamandla okushayela.

10. Isifunda sokuthola amandla kagesi anamandla
Umjikelezo wokutholwa kwamandla kagesi owenziwe nge-D1, D2, R2, R7, kanye ne-DB usetshenziselwa ukuthola ukuthi ingabe amandla kagesi aphakathi kwebanga elingu-150V~270V ngemva kokuthi i-CPU iguqule ngokuqondile i-pulse wave wave AD.

11. Ukulawulwa kwamandla kagesi aphezulu ngokushesha
I-R12, R13, R19 kanye ne-LM339 yakhiwe. Uma i-voltage yangemuva ijwayelekile, lesi sifunda ngeke sisebenze. Lapho i-voltage ephezulu esheshayo idlula i-1100V, iphinikhodi engu-339 1 izokhipha amandla aphansi, yehlise i-PWM, inciphise amandla okukhiphayo, ilawule i-voltage yangemuva, ivikele i-IGBT, futhi ivimbele ukuwohloka kwe-overvoltage.